WO2013060995A1 - Procede de preparation du facteur h humain - Google Patents
Procede de preparation du facteur h humain Download PDFInfo
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- WO2013060995A1 WO2013060995A1 PCT/FR2012/052461 FR2012052461W WO2013060995A1 WO 2013060995 A1 WO2013060995 A1 WO 2013060995A1 FR 2012052461 W FR2012052461 W FR 2012052461W WO 2013060995 A1 WO2013060995 A1 WO 2013060995A1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/88—Lyases (4.)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
- C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
- C07K14/472—Complement proteins, e.g. anaphylatoxin, C3a, C5a
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/85—Vectors or expression systems specially adapted for eukaryotic hosts for animal cells
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N2800/00—Nucleic acids vectors
- C12N2800/22—Vectors comprising a coding region that has been codon optimised for expression in a respective host
Definitions
- the present invention relates to a method for preparing recombinant human factor H in a human cell line, with improved yield.
- Factor H is a plasma protein present in human plasma at an average rate of 500 mg / L. It is produced primarily by liver cells constitutively, but also locally produced by other cells, such as retinal pigment epithelial cells, endothelial cells, platelets or mesenchymal stem cells.
- factor H The main function of factor H is the regulation of activation of the alternative complement pathway.
- the factor H is involved in this regulation by three mechanisms: (i) the regulation of the activity of factor I, which allows the inactivation of the protein C3b (iC3b); (ii) inhibition of C3 convertase formation alternates by competition with factor B for C3b binding; (iii) the acceleration of the dissociation of the C3 convertase of the alternate pathway (C3bBb) (decay acceleration activity).
- Factor H can act either in the blood fluid phase to maintain a low level of activated C3 molecules (C3b), or at cell surfaces with polyanions, such as glycosaminoglycans, heparan sulfate or sialic acid, to protect host cells from cell lysis induced by complement activation.
- C3b activated C3 molecules
- polyanions such as glycosaminoglycans, heparan sulfate or sialic acid
- the HF1 gene having 102,494 base pairs (bp) and 23 exons (NCBI RefSeq: NG_007259.1), is located in the RCA gene cluster (regttlator of complement activaiion) on locus lq32, Chrl. Because of alternative splicing, two mRNAs are transcribed from the HF1 gene, one having 3696 bp and encoding the FH protein and the other having 1347 bp and encoding the FH-1 (FH-like 1 protein) protein. .
- Factor H protein (1213 aa, 155 kDa) is a single chain glycoprotein composed of 20 short repeats (SCR) domains (also called CCP or SHUSHI).
- SCR short repeats
- SHUSHI 20 short repeats domains
- the FHL-1 protein (449 amino acids, 42 kDa) has the first 7 SCR domains plus 4 C-terminal hydrophobic amino acids.
- the human factor H has a polymorphism at position 402 of its amino acid sequence, characterized by the substitution of a tyrosine (Y) by a histidine (H). This substitution itself results from a nucleotide replacement at the level of the HF1 gene, where a T nucleotide is replaced by a C.
- SCR domains are present in many proteins, such as proteins of the FH family (FHR1, FHR2, FHR3, FHR4), proteins of the RCA family (CRI, CR2, C4BP, CD55, CD46) or pathogens (vaccinia virus, ”).
- SCR domain is composed of approximately 60 amino acids separated by a short linker sequence (3-8 amino acids for human FH).
- the SCR domains consist mainly of beta strands and each have two S-S bridges distributed at each end of the domain. Sequence homology analyzes show that 4 conserved cysteines are involved in the formation of two intraday S-S bridges and that a tryptophan (W) in the SCR domain is highly conserved.
- Recombinant human factor H has been produced in the baculovirus system (Sharma and Pangburn, Gene 1994, June 10: 143 (2): 301-2) and in COS cells (Sanchez-Corral et al., Am., J. Hum Genet., 71: 1285-1295, 2002). More recently, recombinant human factor H has been produced in photobioreactor physcomitrella foam (Buttner-Mainik et al., Plant biotechnol, J.
- the present invention relates to the use of a human cell line for carrying out a method for preparing recombinant human factor H with a yield greater than the amount of endogenous factor H produced by said cell line.
- the present invention relates to the use of a human cell line for carrying out a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 1, or a sequence having at least 99%, in particular 99.4%, in particular 99.7% of sequence identity with the sequence SEQ ID NO: 1.
- a protein represented by such a sequence may be the Y402 variant or the human H factor H402 variant or another human H-factor variant, such as a variant mentioned in the website https://www.unipi.org/ ' uniprot / P08603.
- the present invention relates to the use of a human cell line for carrying out a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 1, with a higher yield the amount of endogenous factor H produced by said cell line.
- the recombinant human factor H represented by the sequence SEQ ID NO: 1 corresponds to the variant Y402, in which the amino acid at position 402 is a tyrosine.
- the present invention relates to the use of a human cell line for carrying out a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 13, with a yield of greater than the amount of endogenous factor H produced by said cell line.
- the recombinant human factor H represented by the sequence SEQ ID NO: 13 corresponds to the variant H402, in which the amino acid at position 402 is a histidine.
- This cell line may be a line that does not produce H factor, a line producing H factor in an undetectable amount, or a line producing endogenous factor H.
- the amount of endogenous H-factor produced by a cell line is determined by the ELISA method with a judiciously chosen pair of antibodies that can detect minimal concentrations of 5 ng / ml of Factor H in the cell supernatant.
- Commercial dosing kits are also available (eg Kit HK342 Hycult).
- the present invention relates to the use of a human cell line producing endogenous factor H for the implementation of a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 1, with a yield greater than the amount of endogenous factor H produced by said cell line.
- a factor H producing line is meant a cell line for which it is possible to detect the presence of endogenous factor H in the cellular supernatant by conventional protein detection methods such as ELISA and Western Blot.
- Some human cell lines such as the PER.C6® cell line or the HEK 293F line, produce human factor H endogenously.
- endogenous factor H productivity by these cells is relatively low; it is approximately 70 ⁇ g / L for the PER.C6® cell line, after 48H of culture, and about 11 ⁇ g / L of H factor secreted in the culture medium for the HEK 293F cell line after 7 days. days of culture.
- the present invention relates to the use of a human cell line, with a yield greater than 10 mg / L, particularly greater than 20 mg / L, or 30 mg / L, or 40 mg / L, or 50 mg / L, more particularly greater than 60 mg / L, or 70 mg / L, or 80 mg / L, or 90 mg / L, especially 100 mg / L of culture medium .
- the mode of production used to produce recombinant factor H is one of the following modes: “batch”, “Fedbatch” or “culture with filtration-retention” or a mode that derives from one of these 3 modes of production, one By “yield” is meant the amount of recombinant H-factor produced per volume of final culture medium to be processed in post-production (also referred to as Downstream Process or DSP).
- yield means the quantity of factor H produced per volume of culture medium initially contained. in the production enclosure.
- the "batch" production mode is characterized by a constant volume.
- the inoculum is added to the medium and the culture is allowed to proceed. Biomass evolves according to the characteristic growth curve of the line used for production. We intervene on the speed of rotation, the aeration (02 and CO2) or the adjustment of the pH, but no nutritive medium is added during culture and nothing is removed.
- a final amount of 10 mg recombinant proteins produced in a culture medium of final volume of one liter, which is identical to the initial volume, corresponds to a production yield of 10 mg / L
- the "Fedbatch" production mode is characterized by a variable volume.
- the production is done initially as a normal batch in a given volume.
- Fresh medium is then added to maintain the cells in the desired state (stable cell viability, exponential phase, stationary phase). It is it is possible to adapt the "feed” to never exceed the desired limit values (example: glucose concentration ⁇ 4 g / L).
- the feed strategy depends on the line used for production.
- the biomass In the exponential phase, the biomass accumulates rapidly, allowing the product to accumulate very quickly in a reduced volume. In stationary phase the biomass is kept constant allowing a progressive accumulation of product in a reduced volume.
- a final amount of 30 mg of recombinant H-factor produced in 1.5 liters of final volume of culture medium, which is initially one liter, corresponds to a production yield of 20 mg / L.
- the "culture with filtration-retention" production mode (also known as the XD process) is characterized by an increase in biomass in a constant volume. It is a mixed mode in the batch and fed-batch modes for which the addition of the fresh medium is compensated by the withdrawal of an equivalent volume of supernatant without the recombinant factor H which will be retained via a filtration membrane whose cut-off point is less than the size of the recombinant protein. The removed supernatant is removed. The volume thus remains constant while the biomass accumulates rapidly, which also makes it possible to accumulate recombinant factor H.
- a final amount of 60 mg of the recombinant factor H produced in one liter of final volume of culture medium corresponds to a production yield of 60 mg / ml. L.
- the "culture with perfusion" mode of production is characterized by constant volume and biomass.
- the addition of the fresh medium is compensated for by the withdrawal of an equivalent volume of supernatant but in this mode of production the withdrawn supernatant contains the recombinant Factor H and is thus conserved which leads to a high volume. final to treat in DSP higher than the initial volume without accumulation of the protein of interest.
- the present invention is based on the unexpected finding made by the inventors that human factor H codon optimization makes it possible to increase the productivity of recombinant human factor H in several human cell lines.
- Codon optimization aims to replace natural codons by codons whose transfer RNA (tRNA) carrying the amino acids are most common in the cell type considered.
- tRNA transfer RNA
- the mobilization of frequently encountered tRNAs has the major advantage of increasing the translation speed of the messenger RNAs (mRNAs) and therefore of increasing the final titre (JM Carton et al., Protein Expr Purif, 2007).
- Sequence optimization also plays on the prediction of mRNA secondary structures that could slow down reading by the ribosomal complex. Sequence optimization also has an impact on the percentage of G / C that is directly related to the half-life of the mRNAs and therefore to their potential to be translated (Chechetkin, J. of Theoretical Biology 242, 2006 922-934 ).
- Codon optimization can be done by substitution of natural codons using codon frequency (Codon Usage Table) tables for mammals and more specifically for Homo sapiens.
- codon frequency Codon Usage Table
- nucleic acid encoding the sequence SEQ ID NO: 1 is represented by:
- the percentage identity between two nucleic acid sequences can be calculated according to the following formula:
- sequence SEQ ID NO: 2 or a sequence having at least 75%, preferably at least 85%, especially 90%>, especially 95% of sequence identity with the sequence SEQ ID NO: 2 is a sequence obtained by codon optimization from the natural nucleic acid sequence encoding human factor H.
- the natural nucleic acid encoding the Y402 variant of human factor H is represented by the sequence SEQ ID NO: 8.
- the natural nucleic acid encoding the human H factor H402 variant is represented by the sequence SEQ ID NO: 17.
- nucleic acid encoding the human factor H precursor further comprising a nucleic acid is chosen from:
- nucleic acid represented by the sequence SEQ ID NO: 5 and coding the natural signal peptide of the factor H, or
- nucleic acid represented by the sequence SEQ ID NO: 3 or by a sequence having at least 85%, in particular 90%, especially 95% of sequence identity with the sequence SEQ ID NO: 3, and coding the signal peptide of H factor, (optimized natural PS) or
- nucleic acid encoding a natural signal peptide of a protein different from the factor H, or
- nucleic acid encoding the signal peptide encoded by the sequence SEQ ID NO: 4 (PCT / FR2011 / 050544) or by a sequence having at least 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 4.
- the natural signal peptide of a protein different from human factor H may be a signal peptide chosen from the signal peptides of all the proteins which are secreted in eukaryotes and in particular in mammals and more particularly in humans, such as those of immunoglobulins. growth factors such as ⁇ , hormones such as insulin, enzymes such as trypsinogen, coagulation factors such as prothrombin.
- sequence SEQ ID NO: 3 or a sequence having at least 85%, in particular 90%, particularly 95% of sequence identity with the sequence SEQ ID NO: 3 is a sequence obtained by codon optimization from FIG. sequence SEQ ID NO: 5.
- the nucleic acid represented by the sequence SEQ ID NO: 4 or by a sequence having at least 85%, especially 90%, particularly 95% of sequence identity with the sequence SEQ ID NO: 4 encodes an artificial signal peptide.
- nucleic acid encoding the human H-factor precursor comprising the nucleic acid encoding the signal peptide and the nucleic acid encoding the human factor H, is subject to optimization. of codons.
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of:
- nucleic acid encoding a signal peptide, said nucleic acid being chosen from the sequence SEQ ID NO: 3 or a sequence exhibiting at least 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 3, and
- nucleic acid encoding the factor H represented by the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 2,
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of the nucleic acid represented by the sequence SEQ ID NO: 3 and the nucleic acid represented by the sequence SEQ ID NO: 2.
- nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 6 or a sequence having at least 85%, especially 90%), particularly 95% sequence identity with the sequence SEQ ID NO: 6.
- nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 6.
- sequence SEQ ID NO: 6 corresponds to codon optimization of the human H-factor precursor which comprises its natural signal peptide.
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of:
- nucleic acid encoding a signal peptide, said nucleic acid being chosen from the sequence SEQ ID NO: 3 or a sequence exhibiting at least 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 3, and
- nucleic acid encoding the factor H represented by the sequence SEQ ID NO: 13, said nucleic acid being chosen from the sequence SEQ ID NO: 14 or a sequence having at least 75%, preferably 85%, especially 90%, especially 95% sequence identity with the sequence SEQ ID NO: 14,
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of the nucleic acid represented by the sequence SEQ ID NO: 3 and the nucleic acid represented by the sequence SEQ ID NO: 14.
- nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 15 or a sequence having at least 85%, especially 90%), particularly 95% sequence identity with the sequence SEQ ID NO: 15.
- a nucleic acid encoding a recombinant human factor H precursor comprises or consists of:
- nucleic acid coding for human factor H which has been the subject of codon optimization
- nucleic acid encoding an artificial signal peptide, which does not correspond to the natural signal peptide of human factor H, but may confer a secretion capacity that is better or similar to that of the human H factor natural signal peptide.
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of:
- nucleic acid encoding a signal peptide, said nucleic acid being chosen from the sequence SEQ ID NO: 4 or a sequence exhibiting at least 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 4, and
- nucleic acid encoding the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 or a sequence exhibiting at least 75%, preferably at least 85%, especially 90%, especially 95% of sequence identity with the sequence SEQ ID NO: 2,
- the nucleic acid encoding the recombinant human factor H precursor comprises or consists of the nucleic acid represented by the sequence SEQ ID NO: 4 and the nucleic acid represented by the sequence SEQ ID NO: 2.
- the nucleic acid encoding the recombinant human factor H precursor is represented by the sequence SEQ ID NO: 7 or a sequence having at least 85%, in particular 90%, especially 95% sequence identity with the sequence. SEQ ID NO: 7,
- nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 7.
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of:
- nucleic acid encoding a signal peptide, said nucleic acid being chosen from the sequence SEQ ID NO: 4 or a sequence exhibiting at least 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 4, and
- nucleic acid encoding the factor H represented by the sequence SEQ ID NO: 13, said nucleic acid being chosen from the sequence SEQ ID NO: 14 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 14,
- nucleic acid encoding the recombinant human factor H precursor comprises or consists of the nucleic acid represented by the sequence SEQ ID NO: 4 and the nucleic acid represented by the sequence SEQ ID NO: 14.
- nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 24 or a sequence having at least 85%, especially 90%), particularly 95% sequence identity with the sequence SEQ ID NO: 24.
- a nucleic acid encoding the human factor H precursor comprising or consisting of the nucleic acid represented by the sequence SEQ ID NO: 5 and the nucleic acid represented by the sequence SEQ ID NO: 8 can be used as a control of the productivity an optimized nucleic acid encoding the Y402 variant as described in the present invention. More particularly, this control nucleic acid may be the nucleic acid represented by the sequence SEQ ID NO: 9.
- a nucleic acid encoding the human H-factor precursor comprising or consisting of the nucleic acid represented by the sequence SEQ ID NO: 5 and the nucleic acid represented by the sequence SEQ ID NO: 17, may be used as a control for a optimized nucleic acid encoding the H402 variant as described in the present invention.
- control nucleic acid may be the nucleic acid represented by the sequence SEQ ID NO: 18.
- the human factor H as defined above is produced in the PER.C6® cell line or the HEK 293F cell line.
- the PER.C6® cell line is derived from human primary retinal cells in which an Ad5 adenoviral DNA fragment that contains both the El A gene and the E1B gene is inserted into the cells by a vector.
- This adenoviral DNA fragment makes it possible to confer immortality to the cells in which it is inserted, via the E1B protein which inhibits p53.
- the El A protein has a tropism for the hCMV viral promoter and allows its transactivation and the potentiation of the gene sequence that will be inserted 3 'of the latter and which may be the H factor.
- the PER.C6® cell line produces, endogenously, both the human H-factor H402 variant and the Y402 variant.
- the present invention particularly relates to the use of the PER.C6® cell line for the implementation of a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 1, with a yield greater than the amount of endogenous factor H produced by said cell line.
- the present invention relates to the use of the PER.C6® cell line for the implementation of a process for the preparation of recombinant human factor H, represented by the sequence SEQ ID NO: 1, in which the acid The nucleic acid encoding the precursor factor H is represented by the sequence SEQ ID NO: 6, 7 or 9.
- the present invention also particularly relates to the use of the HEK 293F cell line for the implementation of a process for the preparation of human factor H recombinant, represented by the sequence SEQ ID NO: 1, with a yield greater than the amount of endogenous factor H produced by said cell line.
- the HEK 293F cell line produced endogenously only the human factor H variant Y402.
- the present invention relates to the use of the HEK 293F cell line for carrying out a recombinant human factor H preparation method, represented by the sequence SEQ ID NO: 1, wherein the nucleic acid encoding the precursor of the factor H is represented by the sequence SEQ ID NO: 6 or 7.
- the present invention also relates to the use of a human cell line, such as the PER.C6® or HEK 293F cell line for carrying out a recombinant human factor H preparation method, wherein the nucleic acid Factor H precursor coding is a genomic nucleic acid comprising artificial or natural human factor H or other human gene introns and human H factor natural exons.
- a human cell line such as the PER.C6® or HEK 293F cell line for carrying out a recombinant human factor H preparation method, wherein the nucleic acid Factor H precursor coding is a genomic nucleic acid comprising artificial or natural human factor H or other human gene introns and human H factor natural exons.
- the present invention also relates to the nucleic acid encoding recombinant human factor H, such as the Y402 variant of factor H represented by the sequence SEQ ID NO: 1 or the variant H factor H402 represented by the sequence SEQ ID NO: 13.
- SEQ ID NO: 1 and SEQ ID NO: 13 do not contain the sequence corresponding to that of the signal peptide of Factor H.
- the invention relates to a nucleic acid encoding recombinant human factor H having the sequence SEQ ID NO: 1, comprising a nucleic acid represented by:
- the invention relates to a nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 1, comprising or consisting of:
- nucleic acid encoding a signal peptide, said nucleic acid being selected from the sequence SEQ ID NO: 3 or a sequence having at least 85%>, especially 90% o, particularly 95%> of sequence identity with the SEQ ID sequence NO: 3, and a nucleic acid encoding the factor represented by the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 2.
- nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 1 is represented by the sequence SEQ ID NO: 6 or a sequence having at least 85%, in particular 90%, particularly 95% sequence identity. with the sequence SEQ ID NO: 6.
- the invention relates to a nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 1, comprising or consisting of:
- nucleic acid encoding a signal peptide, said nucleic acid being selected from the sequence SEQ ID NO: 4 or a sequence exhibiting at least 85%, especially 90%), particularly 95% of sequence identity with the sequence SEQ ID NO: 4, and
- nucleic acid encoding the factor represented by the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 2.
- nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 1 is represented by the sequence SEQ ID NO: 7 or a sequence having at least 85%, in particular 90%, particularly 95% sequence identity. with the sequence SEQ ID NO: 7.
- the invention relates to a nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 13, comprising or consisting of:
- nucleic acid encoding a signal peptide, said nucleic acid being chosen from the sequence SEQ ID NO: 3 or a sequence exhibiting at least 85%, especially 90%), particularly 95% of sequence identity with the sequence SEQ ID NO: 3, and
- nucleic acid encoding the factor represented by the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 14 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 14.
- nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 13 is represented by the sequence SEQ ID NO: 15 or a sequence having at least 85%, especially 90%>, especially 95% sequence identity with the sequence SEQ ID NO: 15.
- the invention relates to a nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 13, comprising or consisting of:
- nucleic acid encoding a signal peptide, said nucleic acid being selected from the sequence SEQ ID NO: 4 or a sequence exhibiting at least 85%, especially 90%), particularly 95% of sequence identity with the sequence SEQ ID NO: 4, and
- nucleic acid encoding the factor represented by the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 14 or a sequence having at least 75%, preferably 85%, especially 90%, particularly 95% sequence identity with the sequence SEQ ID NO: 14.
- nucleic acid encoding recombinant human factor H of sequence SEQ ID NO: 1 is represented by the sequence SEQ ID NO: 24 or a sequence having at least 85%, in particular 90%, particularly 95% sequence identity. with the sequence SEQ ID NO: 24.
- SEQ ID NO: 16 consists of SEQ ID NO: 4 and SEQ ID NO: 19.
- SEQ ID NO: 21 consists of SEQ ID NO: 4 and SEQ ID NO: 20.
- SEQ ID NO: 22 consists of SEQ ID NO: 3 and SEQ ID NO: 20.
- SEQ ID NO: 23 consists of SEQ ID NO: 3 and SEQ ID NO: 19.
- SEQ ID NO: 19 corresponds to the optimized FH 402H sequence 2.
- SEQ ID NO: 20 corresponds to the optimized FH 402Y sequence 2.
- the present invention also relates to an expression vector comprising or consisting of a nucleic acid as defined above.
- the present invention also relates to human cells, in particular transformed, producing human recombinant factor H with a yield greater than the amount of endogenous factor H produced by said cells.
- the invention relates to human cells having a yield greater than 10 mg / l, particularly 30 mg / l, more particularly 50 mg / l, especially 100 mg / l of culture medium.
- the invention relates to human cells transformed with a vector as defined above.
- the invention relates to human cells producing recombinant factor H represented by the sequence SEQ ID NO: 1 with a yield greater than the amount of endogenous factor H produced by said cells.
- human cells of the invention are selected from PER.C6® and HEK 293F.
- the human cells of the invention form a cell clone.
- the present invention also relates to a process for the preparation of recombinant human factor H, represented by the sequence SEQ ID NO: 1, in a human cell line with a yield greater than the amount of endogenous factor H produced by said cell line, said method comprising the step of culturing said cell-transformed cell line comprising a nucleic acid encoding the human H-factor precursor.
- the vector comprising such a nucleic acid may be any expression vector for eukaryotic cell lines known to those skilled in the art.
- the transformation of the cell line can be carried out by electroporation, AMAXA type nucleofection, a "gene gun” (gun gene) or else using a transfection agent known to man of the art, such as cationic agents of liposomes or polymers such as fectin or PEI agent.
- a transfection agent known to man of the art, such as cationic agents of liposomes or polymers such as fectin or PEI agent.
- the method according to the present invention comprises the following steps:
- the expression vector may contain an antibiotic resistance gene to allow selection of transfected cells upon establishment of cells stably producing the protein of interest.
- the method according to the present invention comprises the following steps:
- step (iv) optionally separating the endogenous form and the recombinant form of the purified factor H in step (iii).
- the purification of human factor H is carried out by chromatographic techniques in one, two or more steps.
- the one-step purification may be an ion exchange column or an affinity column (heparin, factor H ligand or anti-factor H antibody).
- the purification in two steps may be a cation exchange column chromatography step followed by an anion exchange column chromatography step or an anion exchange column chromatography step followed by a column chromatography step cation exchange chromatography or an ion exchange column chromatography step followed by an affinity column chromatography step or an affinity column chromatography step followed by a chromatographic column chromatography step; ions.
- Purification in addition to two steps can be achieved by a combination of these different chromatographies.
- a step of diafiltration, ultrafiltration or gel filtration may be carried out in addition. The purity of a product after such purification can reach 99% purified product.
- the vector for the transformation of the cell line comprises a nucleic acid encoding the precursor of human factor H, represented by the sequence SEQ ID NO: 1, said nucleic acid comprising:
- nucleic acid encoding a signal peptide, said nucleic acid being selected from the sequence SEQ ID NO: 3 and a sequence having at least 85%, especially 90%>, especially 95% sequence identity with the sequence SEQ ID NO: 3, and a nucleic acid encoding the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 and a sequence having at least 75%, preferably at least 85%, especially 90%, especially 95%> sequence identity with the sequence SEQ ID NO: 2,
- nucleic acid encoding a signal peptide, said nucleic acid being selected from the sequence SEQ ID NO: 4 and a sequence having at least 85%>, especially 90%>, particularly 95%> sequence identity with the sequence SEQ ID NO: 4, and
- nucleic acid encoding the sequence SEQ ID NO: 1, said nucleic acid being chosen from the sequence SEQ ID NO: 2 and a sequence having at least 75%, preferably at least 85%, especially 90%, especially 95%> sequence identity with the sequence SEQ ID NO: 2.
- the vector for transforming the cell line comprises a nucleic acid, which comprises:
- the vector for transforming the cell line comprises a nucleic acid, which comprises:
- the cell line used in the method according to the present invention may be the PER.C6® or HEK 293F cell line.
- Another object of the present invention is to provide a recombinant H factor having a purity greater than 90%> preferably greater than 95%>.
- said recombinant human factor H retains the biological activity of a plasma human factor H.
- the biological activity of human plasma H-factor includes regulation of Factor I activity, inhibition of alternating C3 convertase formation and acceleration of C3 convertase dissociation.
- said recombinant human factor H retains the biological activity of a plasma human factor H to accelerate the dissociation of C3 convertase.
- the amount of dissociated C3 convertase can be determined as a function of the concentration of FH added.
- the IC50 is determined from the equation calculated for a variable slope sigmoid.
- said recombinant human factor H retains the biological activity of a plasma H factor to regulate factor I activity.
- the present invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising only a recombinant human factor H variant as an active substance, said variant being a variant mentioned in the website http: //www.uniprot.org/uniprot/P08603.
- the present invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising only the recombinant human Factor Y402 variant represented by the sequence SEQ ID NO: 1, without the human factor H H402 variant.
- the recombinant human Factor Y402 variant can be produced by the HEK 293F cell line which endogenously produces only the Y402 variant.
- the production of the recombinant variant Y402 can also be carried out by the PER.C6® cell line which endogenously produces both the Y402 variant and the H402 variant, followed by purification or separation which makes it possible to separate the Y402 variant. H402 variant.
- the PER.C6® cell line can also be modified so as not to endogenously produce the H402 variant.
- the present invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising only the variant H402 of human factor H, without the variant Y402 represented by the sequence SEQ ID NO: 1.
- the human recombinant H-factor H402 variant can be produced by the PER.C6® cell line or the HEK 293F cell line. Purification or separation is necessary to separate the H402 variant from the Y402 variant.
- the PER.C6® and HEK 293F cell lines can also be modified so as not to endogenously produce the Y402 variant.
- the present invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising the variant H402 and the variant Y402 as active substance.
- a pharmaceutical composition according to the present invention also comprises a pharmaceutically acceptable carrier.
- the present invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising greater than 99.5% of a human factor H variant and less than 0.5% of another human factor H variant.
- Figure 1 stands for endogenous H-factor assay in PER.C6® and HEK cells
- Figure 2 means generation of PER.C6 stable pools stably expressing recombinant H-factor (here, for example, H-variant factor H402)
- Figure 3 shows the kinetics of recombinant H-factor (H402) production in stable PER.C6® pools in batch mode.
- Figure 4 is an ELISA assay of recombinant H-Factor produced in HEK 293F cells in batch mode for 7 days.
- Figure 5 is an ELISA assay of recombinant Factor H produced in PER.C6® stable pools in batch mode for 7 days.
- Figure 6A is Analysis of recombinant Factor H produced in the supernatant of PER.C6® and HEK 293F cells by SDS-PAGE
- Figure 6B is Analysis of recombinant Factor H produced in the supernatant of PER.C6® and HEK 293F cells by Western Blot.
- FIG. 6C illustrates the comparison of the electrophoretic profile of the purified recombinant human H factor produced in the PERC6 and HEK cells with that of the purified plasma human factor (LFB batch) in SDS-PAGE and Coomassie blue staining after treatment with a reducing agent or not (DTT).
- Figure 6D illustrates the analysis of purified recombinant human H-factor produced in PERC6 and HEK cells and purified human plasma H-factor (LFB lot) by Western Blot using a polyclonal anti-factor H antibody (The Binding Site , ref: PC030).
- Figure 7A stands for Purification of H-Factor on Heparin column followed by a diafiltration step.
- Figure 7B illustrates the SDS-PAGE and Coomassie-blue staining analysis of the one-step chromogenic cation exchange (SP-Sepharose) purification steps of recombinant human H-factor produced in PERC6 cells.
- Figure 7C illustrates the SDS-PAGE and Coomassie blue staining analysis of the two-step purification steps of ion exchange chromatography (SP-sepharose and then Q-sepharose) of recombinant human H-factor produced in HEK cells.
- Figure 8A means Determination of the acceleration activity of C3 convertase dissociation in the presence of supernatant (Sn) of PER.C6® and HEK 293F cells containing recombinant human factor H (variant Y402 or H402 variant).
- Figure 8B describes Determination of C3 convertase deletion acceleration activity of purified recombinant human Factor H produced in PER.C6® and HEK 293F cells and plasma human factor H.
- Figure 9A and 9B illustrate the analysis of the purified recombinant human H-factor produced in PERC6 and HEK cells by molecular sieving.
- 95 ⁇ g of the purified recombinant human H factor produced in PERC6 (FIG. 9A) and 50 ⁇ g of the purified recombinant human H factor produced in HEK (FIG. 9B) were separately injected on a gel filtration column (GE Healthcare, Superdex 200 10 / 300 GL, ref: 17-5175-01).
- a majority peak (99% and 97% respectively for PERC6 and HEK) with a size of 377-378 kDa corresponding to human factor H is observed.
- Figure 10 A and 10B illustrate Pelectro capillary electrophoresis focusing of purified recombinant human H-factor produced in PERC6 cells ( Figure 10A) and HEK cells ( Figure 10B).
- Figure 11A and 11B illustrate the analysis of the purified recombinant human H-factor produced in PERC6 and HEK cells by SDS gel electrophoresis under non-reducing conditions ( Figure 11A) or under reducing conditions ( Figure 11B).
- Figures 12A, 12B, 12C and 12D illustrate the analysis of the cofactor activity of Factor I (FI) of recombinant human FHs PERC6 and HEK and formulated human plasma Factor (FH form.) Or IX PBS buffers (FH dess). 10 ⁇ g of C3b protein and 140 ⁇ g of factor I are incubated at 37 ° C. for 30 min in the presence of increasing amounts of factor H (50, 100, 250, 500 and 1000 ng). The different samples are deposited in SDS-PAGE in order to quantify the bands corresponding to the chains a 'and ⁇ of the molecule C3b as well as fragments cleaved at' 1 and a'2 of the chain '.
- FI cofactor activity of Factor I
- FH form. recombinant human FHs PERC6 and HEK and formulated human plasma Factor
- IX PBS buffers FH dess
- FIG. 13 shows the dose-response curve of inhibition of lysis of sheep red blood cells by the Human plasma factor H (PB03 or LP03) or recombinant (PERC6 or HEK).
- Sequence optimization was done by the synthetic gene provider algorithm with optimization for Homo sapiens avoiding the restriction sites necessary for molecular cloning 1.2 Transfection of the pcDNA2001neo vectors containing the Factor H sequences into the PER.C6® cells to generate stable pools.
- Electroporation will be performed with the following vectors:
- MD1Y means the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 9.
- MD2Y means the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 6.
- MD3Y means the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 7.
- MD1H corresponds to the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 18.
- MD2H corresponds to the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 15
- MD3H corresponds to the vector comprising the nucleic acid represented by the sequence SEQ ID NO: 24.
- the cells for stable pool transfection resulting from suspension culture from suspended cells stored in cryotube in serum-free medium, are PER.C6 SF cells adapted in Permab medium (Hyclone, ThermoFisher Scientific) and with stirring. . They were cultured for 3 weeks with agitation at 125rpm.
- the cells are suspended in past 5 E 5 hp / mL by a complete change of Permab environment.
- the volume is adapted to the number of cuvettes planned during electroporation.
- cell concentration and viability are determined.
- the cells must be in an exponential growth phase and have a viability greater than 90%.
- Permab medium (3mM L-Glutamine) is preheated to room temperature.
- the cell culture is resuspended and a count of 1 mL is performed.
- the concentration in cells viable divided by the starting one (6E5 cv / mL) provides the percentage recovery of viability.
- a container at 5E5 cv / mL is inoculated by total medium change and addition of Permab (3 mM L-Glutamine) and G418 at 125 ⁇ g / mL. All of the cells are centrifuged at 300 g for 5 min before adding the selection medium.
- the cells are passed twice a week (Monday and Friday) by complete renewal of the selection medium.
- the volume and the container are adapted so as to obtain a concentration of 3E5 cv / mL at each passage. After 2-3 weeks the cell viability improves. When this reaches about 50%, cultures in agitated conditions can be initiated. In this case, the starting concentration is 5E5 cv / mL.
- cryopreservation is carried out at 5E6 cv / ampoule.
- the volume of the container used for the batch is 250 ml with an initial working volume of 30 ml. Any change in container volume automatically leads to an adaptation of the volumes and values stated in this protocol.
- the cells are seeded at a concentration of 1 E 6 cv / ml by complete renewal of the culture medium.
- the cells are incubated for 7 days at a temperature of 36.5 ° C. with stirring for 125 rpm without renewal or addition of medium.
- a sample is taken every day between the 3rd and 7th day of culture in order to determine the viability, cell density and production of recombinant Factor H.
- the cells were centrifuged at 3000g for 15 minutes. The cell pellet is removed and the cell supernatant containing the recombinant factor H is filtered in 0.22 ⁇ and then frozen at -20 ° C.
- the HEK 293F cells are subcultured at a cell concentration of 7 E 5 vc / ml.
- the cell density and viability of HEK 293F cells are determined on the day of transfection.
- the culture volume corresponding to 30 E 6 cv / ml is centrifuged.
- the supernatant is removed and the cell pellet is taken up in 28 ml of F17 culture medium (Invitrogen), transferred to a 250 ml Erlenmeyer flask and incubated at 37 ° C.
- transfection agent Fectin or PEI
- DNA corresponding to the vector pCEP4 containing one of the Factor H sequences are prepared in OptiMEM medium (Invitrogen) of the following way:
- the cells are then incubated at 37 ° C. with shaking at 125 rpm.
- Positive transfection control a vector expressing GFP (Green Fluorescent Protein) is also transfected under the same conditions. 24h post-transfection transfection efficiency is determined by fluorescence microscopy (ratio of cells expressing GFP on total number of cells).
- HEK 293F cells are transfected under the same conditions but in the absence of an expression vector. This control makes it possible to determine the post-transfection viability and whether there is a toxicity related to the transient production of the exogenous protein (the recombinant factor H).
- the cells are kept in culture for 7 days without adding or renewing culture medium.
- the cell density and viability is determined daily between the 5 th and 7 th day.
- the cells were centrifuged at 3000g for 15 minutes. The cell pellet is removed and the cell supernatant containing the recombinant factor H is filtered in 0.22 ⁇ and then frozen at -20 ° C.
- Cell viability test Cell density and viability are determined using an automated cell culture assay (Cedex, Innovatis - Roche Applied Science). The measure of viability is based on the counting of cells having incorporated trypan blue.
- Sample Preparation The equivalent of 1 g of protein is mixed in vol / vol with Laemli 2X buffer. The mixture is heated for 5 minutes at 95 ° C to denature the proteins.
- the proteins are then deposited in the wells of a linear gel 10% Bis-Tris / HCl pH 6.4.
- the migration is carried out in the presence of a MOPS buffer (50 mM MOPS, 50 mM Tris Base, 0.1% SDS, 1 mM EDTA, pH 7.7).
- MOPS buffer 50 mM MOPS, 50 mM Tris Base, 0.1% SDS, 1 mM EDTA, pH 7.7.
- the proteins are separated at a constant voltage of 200 volts for 60 minutes.
- the gel is washed 3 times 5 minutes with distilled water and then stained with a solution of coomassie blue overnight. The excess is removed by successive washings with distilled water. A photo of the gel is then taken using an imager.
- the gel is transferred into a buffer containing 40 mM of 6-amino-hexanoic acid, 25 mM Tris pH 9.8.
- the membrane is saturated overnight at 4 ° C. in a PBS buffer containing 1% BSA and 0.1% Tween20. The membrane is then washed with physiological saline containing 0.1% tween 20.
- the factor H is revealed using an anti-factor H monoclonal antibody (MCA 508G, Serotec) at a concentration of 0 ⁇ g / ml. ml incubated at room temperature for 60 minutes, followed by a secondary anti-mouse IgG antibody coupled to peroxidase at the concentration of 80 ng / ml incubated at room temperature for 60 minutes.
- MCA 508G anti-factor H monoclonal antibody
- the labeled proteins are then revealed using an enzymatic chemiluminescence kit and detected using an imager equipped with a photon detector.
- BSA Sigma - Ref .: A7030 or Jackson Immuno Research Laboratories, Ref .: 001-000-162 or a quality BSA
- 5 - Dilution buffer PBS buffer - Tween 20 0.1% (vol / vol) - BSA 0.1% (w / vol) Buffer for the dilution of the standard, the samples to be assayed and the revealing antibody. Dissolve the saturation buffer 1 / 10th in washing buffer.
- the samples are prediluted so as to obtain a concentration close to that of the first point of range. Then dilute 1 ⁇ 2 to 1 ⁇ 2 on 8 points.
- HRP Conjugate Marking (HorseRadish Peroxidase) Distribute 100 ⁇ per well of the revealing antibody.
- Enzymatic reaction Distribute 100 ⁇ per well of TMB containing the substrate at a regular time interval and away from any intense light.
- the linear regression line of the standard curve is defined by the pairs (Log (OD at 450 nm-OD white), log of the concentration of factor H in ng / ml).
- the result is the average of all the results obtained for the same sample in the linear zone of the line obtained for the range of the standard.
- the recombinant human factor H produced in the PER.C6® line is purified by one-step ion exchange chromatography.
- the recombinant human factor H produced in the HEK 293 line is purified by two-stage ion exchange chromatography.
- the presence of the purified recombinant human H factor is revealed by SDS-PAGE gel which is stained with Coomassie blue and Western blot according to part 1.5 described above.
- the recombinant human factor H thus purified is analyzed by molecular sieving, by electrofocusing in capillary electrophoresis or by capillary electrophoresis in SDS gel according to the methods described below.
- recombinant human factor H 50 to 100 ⁇ g of recombinant human factor H are injected onto a Superdex 200 10/300 GL gel filtration column (GE Healthcare, ref: 17-5175-01) previously balanced in PBSIX buffer.
- the separation is carried out at a constant rate of 0.4 ml / min on a FPLC apparatus coupled to a UV detector (GE Healthcare, Akta Prime).
- FIGS. 9A and 9B The result of the molecular sieving analysis is illustrated by FIGS. 9A and 9B.
- the chromatogram obtained with the purified recombinant FH produced by the HEK 293F cell line shows a major peak with a retention time of 27.88 min corresponding to the FH (Fig. 9A).
- the chromatogram obtained with the purified recombinant FH produced by the PER.C6 cell line shows a major peak with a retention time of 27.89 min corresponding to the FH and a minor peak emerging at 21.07 min corresponding to aggregated forms. recombinant FH (Fig. 9B).
- Determination of isoforms of recombinant FH is performed by capillary electrophoresis using the Advanced cIEF Starter Kit (Beckman Coulter, A80976) and the PA800 capillary electrophoresis apparatus with a UV detector (Beckman Coulter).
- 10 ⁇ of each sample are then mixed with 240 mix consisting of 200 ⁇ of 3M urea, 12 ⁇ of Pharmalyte 3-10 carrier ampholytes, 20 ⁇ of cathodic stabilizer, 2 ⁇ of anodic stabilizer and 2 ⁇ of pi markers between 4.1 and 10.
- Sample preparations are injected onto an eCAP TM capillary (Beckman Coulter, 477441) using the pre-programmed method Basic pH Gradient Separation Method met.
- a mixture of 5 markers (from 4,1 to 10) is injected at the beginning and at the end of the analysis sequence.
- Determination of the molecular weights of the recombinant FH is performed by capillary electrophoresis using the SDS-MW Analysis kit (Beckman Coulter, 390953) and the PA800 capillary electrophoresis apparatus with a UV detector (Beckman Coulter). 200 ⁇ g of each sample of recombinant FH to be analyzed are mixed with 150 ⁇ l of sample buffer (100 mM Tris-HCl pH 9.0, 1% SDS) and centrifuged on Centricon YM-10 (Millipore, PN 4205) at 4000 g for 10 minutes. The operation is repeated twice (addition of 150 ⁇ l of sample buffer and centrifugation at 4000 g 5 min) then the volume is completed at 100 ⁇ with sample buffer.
- sample buffer 100 mM Tris-HCl pH 9.0, 1% SDS
- 50 ⁇ of the sample is taken and mixed with 45 ⁇ of sample buffer, 2 ⁇ of 10 kD internal standard, 5 ⁇ l of 250 mM iodoacetamide and heated to 70 ° C. C for 10 min.
- the remaining 50 ⁇ are mixed with 45 ⁇ sample buffer, 2 ⁇ 10 kD internal standard, 5 ⁇ 2-mercaptoethanol and heated at 70 ° C for 10 min.
- a standard solution of molecular weight is also prepared by mixing 85 ⁇ of sample buffer, 2 ⁇ of SDS-MW size marker (10 to 225 kD) and 5 ⁇ of 2-mercaptoethano 1.
- the samples thus prepared are analyzed by injection on a capillary 50 ⁇ ID bare-fused silica 2 using the pre-programmed method SDS MW Conditioning-PA800 plus-met.
- the molecular weight of the samples is determined by the 32 Karat software.
- the integration of the peaks makes it possible to calculate the percentage that each peak of the sample represents.
- the electrophoretic profile shows the presence of a very large peak (> 95%) which corresponds to the purified human factor H whose size is 173 - 176 kDa under non-reducing conditions (FIG. 11A) and 143-148 kDa under conditions. reducers (Figure 11B).
- Na2CO3 5.3 g in 500 ml of PPI water (for injection) 0.1 M
- NaHCO3 4.2 g in 500 ml of 0.1 M PPI water Add 30 ml of the Na 2 CO 3 solution to 70 ml of the NaHCO 3 solution and optionally adjust the pH to 9.6. Store at 4 ° C for 2 months. Wash pads
- This buffer serves as a base for saturation, dilution and wash buffers.
- the H-factor ranges are made from a plasma pool (ECQ 1) and a reference batch or any sample containing factor H to be assayed.
- the antigenic concentration Elisa or OD 280 serves as a basis for establishing the ranges by successive, non-independent dilutions.
- the choice of the dosing method is as follows:
- Absorbance values obtained in duplicate for each concentration in the H factor range for the reference substance, ECQ or any other sample are averaged after removal of the outliers.
- the elimination of one point per range and concentration level is acceptable.
- the choice of the point (s) to be eliminated makes it possible to improve the value of the correlation coefficient (R2) and the accuracy of the 95% confidence interval of TEC 50 obtained.
- X is the logarithm of the concentration (g / ml).
- the standard deviation of the IC50 is given for a 95% confidence interval.
- the ⁇ . ⁇ of the range of all samples must be at least 0.35. Any lower value automatically results in the rejection of the test.
- the average value of the IC50 of the plasma pool is 0.058 ⁇ g / ml.
- the assay is valid with a tolerance of two standard deviations giving an average value of 0.058 ⁇ 0.030 ⁇ g / ml. Any new ECQ should be tested in parallel with the old one on at least ten assays to determine its characteristics.
- the average IC50 of the reference substance and the confidence interval are determined after validation.
- the value of the correlation coefficient must be at least 0.99 for each sample.
- the co-factor activity of FH is determined in a liquid phase C3b cleavage test.
- C3b (1 (g) and F1 (140 ng) are incubated alone or in the presence of FH (250 ng) in a volume of 100 ⁇ l in 20 mM imidazole buffer, 75 mM NaCl, pH 7.3 for 30 min. at 37 ° C.
- the reaction is stopped by addition of Laemmli sample buffer supplemented with DTT, then the various samples are subjected to polyacrylamide gel electrophoresis as described above, after staining with Coomassie blue, the gels are scanned and analysis by the Quantity-one software to determine the relative intensities of each of the bands present in each track.
- C3b has a molecular weight of 176 kDa and is composed of 2 chains connected by a disulfide bridge: the chain has 101 kDa and the chain ⁇ 75 kDa.
- the chain a ' is cleaved by the factor I in 2 fragments called a'I (63 kDa) and a'2 (39 kDa), the ⁇ chain (75 kDa) remains unchanged.
- the relative intensities are normalized with respect to the intensity of the ⁇ band present in the control C3b alone.
- the percentage of inactivation of C3b is then calculated by the ratio between the chains cleaved ((a 'I + a'2) / 2) and the total chains a': ( ⁇ '+ (( ⁇ ' 1 + ⁇ '2) / 2)) ( Figure 12).
- FIG. 12D shows that the recombinant FH produced by the PER.C6 and HEK 293F lines have a similar IF factor co-factor and that this activity is comparable to that of plasma human FH.
- the vector pCDNA2001neo-MD1 comprises the nucleic acid represented by the sequence SEQ ID NO: 8, which corresponds to the natural sequence of this human factor H.
- the vector pUC57-MD1 sent by Genscript contains the synthesis gene corresponding to the nucleic acid represented by the sequence SEQ ID NO: 8 (MD1, natural sequence of human factor H). Digestion of the pUC57-MD1 vector with NotI and BamHI restriction enzymes produced 2 fragments of 3000 bp and 3700 bp. These two fragments are separated by gel purification and nucleospin extraction.
- the vector pCDNA2001-neo is digested with NotI and BamHI restriction enzymes, which produces 2 fragments of 25bp and 5533bp. After extraction with nucleospin and dephosphorylation, the 3700 bp fragment corresponding to the nucleic acid represented by the sequence SEQ ID NO: 8 (MD1) is inserted into the pCDNA2001-neo digested vector.
- the vector thus obtained is transformed into TOP 10 bacteria.
- the insertion of the DNA fragment corresponding to MD1 is verified by Screening PCR, using primers CMV1 (SEQ ID NO: 5'-CCATTGACGTCAATGGGAGTTTG-3 * ) and MD1-lrev (SEQ ID NO: 11 5 * - GGTAAACACTTCACAACTTCACATATAG-3 * ), which gives a band of 758bp. Screening PCR positive bacterial clones are then sequenced to verify the H factor transcription unit contained within the expression vector.
- the vectors pCDNA2001neo-MD2 and pCDNA2001neo-MD3 respectively comprise the nucleic acid represented by the sequence SEQ ID NO: 2 and SEQ ID NO: 3, which correspond to the optimized sequence of human factor H and the optimized sequence of human factor H with the optimized signal peptide MB7.
- the vectors pUC57-MD2 and pUC57-MD3 sent by Genscript contain the synthesis genes corresponding respectively to the nucleic acid represented by the sequence SEQ ID NO: 2 (MD2) and SEQ ID NO: 3 (MD3). They are digested with NotI and BamHI restriction enzymes, which generate 2 nucleic acid fragments of 3000 and 3700bp. For each vector, these two fragments are separated by gel purification and nucleospin extraction.
- the vector pCDNA2001-neo is digested with the restriction enzymes NotI and BamHI, which generates 2 fragments of 25 and 5533 bp. After extraction by nucleospin and dephosphorylation, the 3700 bp fragment corresponding to the MD2 or MD3 coding sequence is inserted into the pCDNA2001-neo digested vector.
- the vector thus obtained is transformed into TOP 10 bacteria.
- Example 4 Generation of stable PER.C6® pools transfected with pCDNA2001neo-MD1 or pCDNA2001neo-MD2 or pCDNA2001neo-MD3. ( Figure 2).
- the PER.C6® cells are transfected with the vector pCDNA2001neo-MD1 or the vector pCDNA2001neo-MD2 or pCDNA2001neo-MD3 to generate stable pools according to the protocol described in the part above (Example 1.2)
- Example 5 ELISA Assay of Recombinant Factor H (Variants Y402 and H402) Produced in the Culture Supernatant of PER.C6® and HEK 293F Cells ( Figures 3, 4 and 5).
- the culture supernatant is first diluted to l / 500th point from which a dilution series is made in 1 ⁇ 2 1 ⁇ 2 of 8 points. Each point of the range and the samples to be assayed are made in duplicate. The assay is carried out according to the protocol described in the above part (example 1.6).
- Example 6 Characterization by SDS-PAGE and Western blot of recombinant factor H present in the culture supernatant or purified (variants Y402 and H402) (FIGS. 6A, 6B and 7).
- a volume corresponding to 1 g of recombinant factor H is diluted to 1 ⁇ 2 in 2x Laemmli buffer, heated at 95.degree. 5 minutes and then deposited on a linear gel of 10% polyacrylamide. After migration, the gel is treated either for staining of proteins with coomassie blue or for nitrocellulose membrane transfer followed by immunolabeling (Western Blot) as described in the above (example 1.5).
- Example 7 Determination of the acceleration activity of the dissociation of the recombinant factor H C3 convertase (variants Y402 and H402).
- the recombinant factor H is diluted to a final concentration of 20 ⁇ g / ml. From this tube a range is achieved by the following successive dilutions: 1/2; 1/10; 1/4; 1/4; 1/4; 1/40.
- This decreasing concentration range of factor H is added to the C3 convertase complex formed in the wells of a 96-well plate which is then incubated for 32 to 34 minutes at + 34 ° C. After several washes, the factor B remaining complexed with the immobilized C3 molecule at the bottom of the well is then assayed by an immunoenzymatic reaction of the ELISA type.
- Factor I (FI) cofactor activity of recombinant human FH produced in the PERC6 or HEK line and that of formulated plasma FH or in PBS IX (desalted) buffers are measured according to the method described in section 1.8.2. 10 ⁇ g of C3b protein and 140 ⁇ g of factor I are incubated at 37 ° C. for 30 min in the presence of increasing amounts of factor H (50, 100, 250, 500 and 1000 ng). The different samples are deposited in SDS-PAGE in order to quantify the bands corresponding to the chains a 'and ⁇ of the molecule C3b as well as to cleaved fragments ⁇ '1 and ⁇ '2 of the chain'. The percentage of inactivated C3b molecules is then calculated by the ratio of the amount of cleaved chains to the total amount of chain.
- This test makes it possible to measure the functional activity of the C-terminal portion of the purified human recombinant factor H during the development of therapeutic batches by evaluating its ability to protect sheep red blood cells from lysis induced by a depleted or factor-deficient serum. H functional.
- This test is adapted from the "Sanchez-Corral" method to measure the anti-hemolytic activity of factor H present in the plasma of patients with hemolytic uremic syndrome. (P. Sanchez-Corral, C. Gonzalez-Rubio, S. Rodriguez of Cordoba and M. Lopez-Trascasa, Molecular Immunology 41 (2004) 81-84).
- H factor depleted serum and a human plasma pool is produced in equal proportion to create the conditions for a specific lysis.
- the addition of purified human recombinant H factor ensures the protection of sheep red blood cells (absence of cell lysis) against complement-induced lysis
- the inhibition of lysis of sheep red cells by rCFH is dose-dependent and reaches its 100% inhibition at a dose of 4 ⁇ g. There is no difference between the 2 rCFH but an inhibitory activity substantially higher than that of plasma CFH.
- the blank control comprises the + 50mM EDTA reaction buffer and corresponds to the spontaneous lysis of sheep red blood cells.
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JP2014537698A JP2014532401A (ja) | 2011-10-25 | 2012-10-25 | ヒトh因子の製造方法 |
EP12794376.9A EP2771354A1 (fr) | 2011-10-25 | 2012-10-25 | Procede de preparation du facteur h humain |
CA2850295A CA2850295A1 (fr) | 2011-10-25 | 2012-10-25 | Procede de preparation du facteur h humain |
US14/353,595 US20140271603A1 (en) | 2011-10-25 | 2012-10-25 | Method for preparing human factor h |
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FR1159686A FR2981661B1 (fr) | 2011-10-25 | 2011-10-25 | Procede de preparation du facteur h humain |
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WO2007038995A1 (fr) * | 2005-09-19 | 2007-04-12 | Csl Behring Gmbh | Facteur h pour le traitement de néphropathies chroniques et sa production |
WO2008045548A2 (fr) * | 2006-10-12 | 2008-04-17 | Copernicus Therapeutics Inc. | Cftr à optimisation par codon |
WO2010004004A1 (fr) * | 2008-07-09 | 2010-01-14 | Profibrix Bv | Fibrinogène recombiné |
WO2011058285A1 (fr) * | 2009-11-16 | 2011-05-19 | Laboratoire Francais Du Fractionnement Et Des Biotechnologies | Procede de fabrication d'une preparation de facteur h |
WO2011077102A1 (fr) * | 2009-12-24 | 2011-06-30 | The University Court Of The University Of Edinburgh | Facteur h recombinant et variantes et conjugués de celui-ci |
WO2011114063A2 (fr) * | 2010-03-17 | 2011-09-22 | Lfb Biotechnologies | Nouveau peptide signal, et son utilisation pour la production de proteines recombinantes |
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FR2894145B1 (fr) * | 2005-12-07 | 2008-10-17 | Lab Francais Du Fractionnement | Utilisation de facteur h du complement a titre de medicament |
WO2008135963A2 (fr) * | 2007-05-02 | 2008-11-13 | Hemogem Inc. | Fibrinogène pour traitement d'hémorragies traumatiques et de pathologies plaquettaires |
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WO2007038995A1 (fr) * | 2005-09-19 | 2007-04-12 | Csl Behring Gmbh | Facteur h pour le traitement de néphropathies chroniques et sa production |
WO2008045548A2 (fr) * | 2006-10-12 | 2008-04-17 | Copernicus Therapeutics Inc. | Cftr à optimisation par codon |
WO2010004004A1 (fr) * | 2008-07-09 | 2010-01-14 | Profibrix Bv | Fibrinogène recombiné |
WO2011058285A1 (fr) * | 2009-11-16 | 2011-05-19 | Laboratoire Francais Du Fractionnement Et Des Biotechnologies | Procede de fabrication d'une preparation de facteur h |
WO2011077102A1 (fr) * | 2009-12-24 | 2011-06-30 | The University Court Of The University Of Edinburgh | Facteur h recombinant et variantes et conjugués de celui-ci |
WO2011114063A2 (fr) * | 2010-03-17 | 2011-09-22 | Lfb Biotechnologies | Nouveau peptide signal, et son utilisation pour la production de proteines recombinantes |
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PILAR SÁNCHEZ-CORRAL ET AL: "Structural and Functional Characterization of Factor H Mutations Associated with Atypical Hemolytic Uremic Syndrome", THE AMERICAN JOURNAL OF HUMAN GENETICS, vol. 71, no. 6, 1 December 2002 (2002-12-01), pages 1285 - 1295, XP055027775, ISSN: 0002-9297, DOI: 10.1086/344515 * |
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JP2014532401A (ja) | 2014-12-08 |
US20140271603A1 (en) | 2014-09-18 |
FR2981661A1 (fr) | 2013-04-26 |
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