WO2003003010A1 - Recepteur pael, cellules et animal exprimant ce recepteur pael et methode de selection d'un remede contre la maladie de parkinson - Google Patents
Recepteur pael, cellules et animal exprimant ce recepteur pael et methode de selection d'un remede contre la maladie de parkinson Download PDFInfo
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- WO2003003010A1 WO2003003010A1 PCT/JP2002/006587 JP0206587W WO03003010A1 WO 2003003010 A1 WO2003003010 A1 WO 2003003010A1 JP 0206587 W JP0206587 W JP 0206587W WO 03003010 A1 WO03003010 A1 WO 03003010A1
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Definitions
- the present invention relates to a Pael receptor which is a substrate of an expression product of a Parkin gene involved in hereditary Parkinson's disease, and an antibody which specifically recognizes the Pael receptor.
- the present invention further has a Pael receptor gene and expresses the Pael receptor.
- the present invention relates to a Parkinson's disease model animal that has cells and a Pael receptor gene and expresses a Pael receptor, and various test methods using the same. Background art
- Parkinson's disease is the second most common neurodegenerative disease after Alzheimer's disease
- Parkinson's disease which develops in old age, is clinically a dyskinetic disease characterized by muscle stiffness, tremor, immobility, etc., and the pathology of the selective loss of dopamine neurons in the dense zone of the substantia nigra. Characteristic. The etiology of Parkinson's disease is completely unknown, but the recent discovery of genetic mutations in familial Parkinson's disease is helping to understand its molecular mechanisms.
- a- synuclein is a protein in the presynaptic domain, Lewy bodies
- Lewy body Lewy bodies are highly ubiquitinated intracellular aggregates that are pathological features of all sporadic and some familial Parkinson's diseases (Trojanowski, JQ et al., (1998) Cell Death Differ 5, 832-837) c Lewy bodies are often found in degenerative neurons, including dopamine neurons in the substantia nigra, and are currently strongly suspected to be involved in the pathogenesis of Parkinson's disease.
- AR-JP Kinson's disease
- AR-JP patients are characterized by Parkinson's disease-like symptoms due to shedding of dopamine neuron without Lewy body formation (Mizimo, Y. et al., (1 998) J Neurochem 71, 893-902).
- the Parkin gene is 1.5 megabases and is the largest of all human genes.
- the Parkin gene consists of 12 exons and encodes a 465 amino acid protein with a molecular weight of 52 kDa (Kitada, T. et al., (1998) Nature 392, 605-608; Shiniura, H. et al. , (1999) Ann Neurol 45, 668-672) 0
- the amino-terminal 76 amino acids of Parkin are 62% homologous to ubiquitin.
- the carboxy terminus of Parkin has two RING fingers, between which there is a motif similar to a RING finger, in between RING fingers (Morett, E. et al.,
- E3 plays a role in specifically recognizing and binding to basic proteins and promoting their ubiquitination.
- the high specificity of recognizing proteins to be ubiquitinated is determined by E3, which is expected to be of a great variety.
- Several groups, including our group, have shown that Parkin is E3 and that the mutant Parkin found in AR-JP patients lacks E3 activity (Imai, Y. et al. al., (2000) J Biol Chem 275, 35661-35664; Shimura, H. et al., (2000) Nat Genet 25, 302-3 05; Zhang, Y. et al., (2000) Proc Natl Acad Sci USA 97, 13354-13359). Disclosure of the invention
- AR-JP is caused by dysfunction of E3, Parkin. It is expected that substrate protein that has not undergone ubiquitination and has not been degraded will accumulate abnormally in the cells, causing death of the nigra dopamine neurons.
- substrate protein that has not undergone ubiquitination and has not been degraded will accumulate abnormally in the cells, causing death of the nigra dopamine neurons.
- Parkin's substrate was not found. Therefore, the identification of Parkin's substrate protein is considered to be the key to elucidating the pathological mechanism of AR-JP and developing therapeutic methods. Furthermore, in sporadic Parkinson's disease, dopamine neurons may be specifically denatured by the same mechanism as AR-JP, so the identification of Parkin's substrate will elucidate the etiology of all types of Parkinson's disease and develop therapeutic methods. Has the expectation of contributing to
- an object of the present invention is to provide a substrate for Parkin, a system for elucidating the etiology of Parkinson's disease using the substrate, and a method for screening a therapeutic agent for Parkinson's disease.
- the present inventors have conducted intensive studies to solve the above problems, and as a result, considered a G protein-coupled membrane protein, a protein named Pael (Parkin-associated endothel in receptor-1 ike) receptor.
- Pael Parkin-associated endothel in receptor-1 ike
- the present invention has the following matters.
- the Parkinson's disease is autosomal recessive gene Parkinson's disease.
- a mammal and its progeny obtained by ontogenizing a totipotent cell into which DNA encoding the human Pael receptor or a mutant thereof has been introduced, and having the transgene in the somatic chromosome
- the non-human mammal according to any one of the above (9) to (14), wherein
- a method for screening a therapeutic agent for Parkinson's disease by contacting the human Pael receptor according to (1) or (2) with a candidate therapeutic agent for Parkinson's disease and using the amount of Pael receptor in animal cells as an index.
- the animal cell according to any one of the above (3) to (8) and (16) is contacted with a candidate therapeutic agent for Parkinson's disease, and the therapeutic agent for Parkinson's disease is determined using the amount of Pael receptor in the animal cell as an index. How to screen.
- Parkinson's disease is autosomal recessive gene Parkinson's disease.
- a probe comprising all or a part of DNA encoding human Pael receptor for detecting a risk factor for developing Parkinson's disease.
- DNA encoding the Pael receptor is described in J. Sambrook, EF Fritsch & ⁇ ⁇ Maniatis (1989): Molecular Cloning, a laboratory manual, second edition, Cold Spring Harbor Laboratory Press and Ed Harlow and David Lane (1988): Ant It can be obtained according to a method well-known to those skilled in the art, such as ibodies, a laboratory manual, and Cold Spring Harbor Laboratory Press.
- a cDNA library is prepared from RNA extracted from human brain, and the library is screened using the Parkin as a base by the yeast two-hybrid method to obtain a Parkin substrate.
- Parkin refers to the expression product of the Parkin gene associated with hereditary Parkinson's disease.
- the library can be obtained by screening the library using an oligonucleotide probe synthesized based on the DNA sequence encoding the Pael receptor.
- Examples of the DNA encoding the Pael receptor include a DNA containing the base sequence represented by SEQ ID NO: 1 and a DNA encoding the amino acid sequence represented by SEQ ID NO: 2.
- Mutants of the DNA encoding the Pael receptor can be prepared by mutagenizing the wild-type Pael receptor cDNA by a known method.
- Code for Pael receptor DNA variants that hybridize under stringent conditions to DNA containing the nucleotide sequence represented by SEQ ID NO: 1 and encode a protein that can serve as a Parkin substrate, or represented by SEQ ID NO: 2.
- stringent conditions refer to conditions under which a so-called specific hybrid is formed and a non-specific hybrid is not formed.
- DNAs having high homology that is, DNAs having homology of 60% or more, preferably 80% or more hybridize with each other, so that nucleic acids with low homology do not hybridize with each other. More specifically, it refers to a condition where the sodium concentration is 150 to 900 mM, preferably 600 to 900 mM, and the temperature is 60 to 68, preferably 65.
- amino acid sequence represented by SEQ ID NO: 2 as an amino acid sequence in which one or more amino acids are deleted, substituted or added, 1 to 10, preferably 1 to 10 amino acid sequences represented by SEQ ID NO: 2 5, more preferably 1 or 2 amino acids may be deleted, and 1 to 10, preferably 1 to 5, more preferably 1 or 2 of the amino acid sequence represented by SEQ ID NO: 2 One amino acid may be replaced by another amino acid. In addition, 1 to 10, preferably 1 to 5, more preferably 1 or 2 amino acids may be added to the amino acid sequence represented by SEQ ID NO: 2.
- amino acid sequence in which one or more amino acids are deleted, substituted or added in the amino acid sequence of SEQ ID NO: 2 the amino acid sequence of SEQ ID NO: 2 and at least 60% or more when calculated using BLAST Those having a homology of preferably 80% or more, more preferably 95% or more are mentioned.
- DNA encoding the Pael receptor or a mutant thereof can be obtained by PCR using the inlaid cDNA as a ⁇ type or by hybridization using a DNA fragment having the nucleotide sequence as a probe. In this way, it is possible to obtain a protein that contains the amino acid sequence of SEQ ID NO: 2 in which one or more amino acids have been deleted, substituted or added, and that can serve as a substrate for Parkin, from the obtained DNA. it can.
- Parkin substrate means a protein that is ubiquitinated and degraded in the presence of ATP, El, E2, and ubiquitin in a parkin-dependent manner.
- ATP, El, E2 ubiquitin in vitro It is possible to confirm that it is a substrate of Parkin by mixing it with Parkin and confirming whether it is degraded by ubiquitination.
- Gene diagnosis can be performed using all or a part of the DNA encoding the Pael receptor to determine whether or not it has a risk factor for developing Parkinson's disease.
- the length of the DNA sequence used is 12 to 16 bases or more, preferably 20 bases or more.
- polynucleotides that hybridize with polynucleotides having these sequences under the above-mentioned stringent conditions can also be used for diagnosis.
- Obtaining a Pael receptor-expressing cell by inserting the DNA encoding the Pael receptor of the present invention shown in SEQ ID NO: 1 and a mutant thereof into an expression vector, and introducing the vector into an appropriate host cell; Can be.
- the vector any vector can be used as long as it can be replicated in a host cell such as plasmid, phage or virus.
- Escherichia coli plasmids such as BR322, pBR325, pUC118, pUC119, pKC30, and pCFM536; Bacillus subtilis plasmids such as pUBllO; yeast plasmids such as pG-1, YEpl3, and YCp50;
- vectors for mammalian cells include viral DNA such as baculovirus, vaccinia virus, and adenovirus, SV40 and its derivatives, and the like.
- the vector contains an origin of replication, a selection marker, and a promoter, and may contain, if necessary, an enhancer, a transcription termination sequence (terminator), a ribosome binding site, a polyadenylation signal, and the like.
- the promoter any promoter can be used as long as it can be efficiently expressed in the host cell.Examples include SRa promoter, SV40 promoter, LTR promoter, CMV promoter, HSV-TK promoter, etc. .
- a nucleic acid encoding a known signal peptide may be added to the N-terminal.
- Bacterial cells such as Escherichia coli, Streptomyces, Bacillus subtilis, etc.
- Fungal cells such as strains of the genus Lugilus, yeast cells such as baker's yeast, methanol-assimilating yeast, insect cells such as Drosophila S2, Spodoptera Si9, and mammalian cells such as HEK293T, SH-SY5Y, CH0, COS, BHK, 3T3, and C127. And the like.
- Transformation can be performed by known methods such as calcium chloride, calcium phosphate, DEAE-dextran-mediated transfection, and electroporation.
- Pael receptors can be isolated from the thus obtained Pael receptor-expressing cells.
- Parkinson can be used to convert animal cells that express the Pael receptor into substances that suppress the accumulation of the Pael receptor, substances that promote ubiquitination or degradation of the Pael receptor, substances that promote the excretion of the Pael receptor out of the body, etc. It can be used to screen for drugs that can be used to treat disease.
- the Parkin gene (Kitada, T. et al., (1998) Nature 392, 605-608; Shimura, H, eta al., (1999) Ann Neu rol 45, 668) simultaneously with the gene encoding the Pael receptor. -672), a mutant of the Parkin gene, a gene encoding a Pael receptor-related receptor such as endothelin receptor type A or type B (Arai, H et al. (199 0) Nature 348, 730-732, Sakurai, T et al.
- the animal is inoculated subcutaneously, intramuscularly, intraperitoneally, and vein several times, for example, in animals such as mice, guinea pigs, rabbits, and goats, according to methods well known to those skilled in the art. After sufficient immunization, animals can be bled and serum separated to produce anti-Pael receptor antibodies. At this time, an appropriate adjuvant can be used. Monoclonal antibodies can also be prepared by known methods.
- a hybridoma obtained by cell fusion between mouse spleen cells immunized with Pael receptor and mouse myeloma cells was prepared, and the culture supernatant of the hybridoma or the hybridoma was administered intraperitoneally. It can be prepared from mouse ascites.
- the Pae1 receptor used as an immunizing antigen may be a natural protein extracted from brain tissue, a recombinant protein, or a chemically synthesized one.
- the protein may be a protein having the entire amino acid sequence, or may be a peptide fragment having a partial structure of the protein or a fusion protein with another protein.
- peptide fragment a fragment obtained by degrading the protein with a suitable protease may be used, or a product obtained by incorporating the whole or a part of the nucleotide sequence shown in SEQ ID NO: 1 into an expression vector and expressing it.
- the polypeptide fragment can be used after being bound to an appropriate carrier protein by chemical bonding.
- the reactivity of the obtained antibody can be measured by methods well known to those skilled in the art, such as enzyme immunoassay (EIA), radioimmunoassay (RIA), and Western blotting.
- a homolog of a Pael receptor such as LP-2 is used as an antigen used in the reactivity assay in addition to the Pael receptor, the Pael receptor is recognized, but the Pael receptor such as LP-2 is recognized.
- a specific antibody that does not recognize the homolog of the above can be obtained.
- the gene to be introduced into the Pael receptor expression model animal is linked with a promoter sequence for controlling its expression.
- promoter sequences are not particularly limited, and commonly used sequences can be appropriately combined and used. However, in order to specifically express the transgene in the brain, it is preferable to use the / 3-actin promoter.
- transgenic animals The creation of transgenic animals is described, for example, in Pro. Natl. Acad. Sci. USA 77: 7380-
- the above-described transgene is introduced into a totipotent cell of a mammal, this cell is generated into an individual, and an individual having the transgene incorporated in the genome of a somatic cell is selected.
- mammals a large number of inbred strains have been produced, and mice that are well-equipped with technologies such as fertilized egg culture and in vitro fertilization are preferable.However, technically, all animal species should be targeted. It is possible.
- fertilized eggs and early embryos, as well as cultured cells such as ES cells having multipotency may be mentioned as totipotent cells into which the offspring are introduced.
- Known methods such as the electrostatic pulse method, the ribosome method, and the calcium phosphate method can also be used as a method for introducing genes into cultured cells, but taking into account the production efficiency of transgenic animals and the transfer efficiency of the transgene to the next generation.
- a method of physically injecting a DNA solution into a fertilized egg (microinjection) is preferable.
- the Pael receptor-expressing animal can be obtained by transplanting the totipotent cells into which the gene has been injected into the oviduct of the foster parent and developing it into an individual. DNA can be extracted from somatic cells and the presence of the transgene can be confirmed using Southern blot analysis, PCR assay, or the like. An animal in which the presence of the introduced gene is confirmed as the first generation (Founder) can be used to efficiently produce an animal in which the Pael receptor gene or its mutant is stably integrated into a part of the chromosome by mating.
- the Parkin gene a mutant of the Parkin gene isolated from an AR-JP patient, and / or a gene encoding a Pael receptor-related receptor such as an endoselin receptor. May be incorporated at the same time.
- the transgenic animal thus created is an optimal model animal for elucidating the cause of Parkinson's disease and screening for drugs that can be used to treat Parkinson's disease.
- the transgenic animal provided by the present invention carries the transgene in all body cells, cells isolated from the animal individual also express the Pael receptor. Therefore, the culture system of these cells can be used for elucidating the cause of Parkinson's disease and screening for a drug that can be used for treatment of Parkinson's disease, as in the case of the above-mentioned animal individual.
- the above-described Pael receptor, cells expressing the Pael receptor, transgenic animals, and cells obtained from the transgenic animals can be used for screening for drugs that can be used for treating Parkinson's disease.
- Drugs that can be used to treat Parkinson's disease include substances that inhibit the accumulation of Pael receptors, substances that promote ubiquitination or degradation of Pael receptors, substances that promote the excretion of Pael receptors outside the body, etc. Is mentioned.
- a drug candidate substance that can be used for the treatment of Parkinson's disease is added to cultured cells that express the Pael receptor, or administered to animals that express the Pael receptor. By measuring the amount and degree of ubiquitination, it is possible to judge the possibility of using a candidate substance as a drug, and to screen for a therapeutic drug.
- FIG. 1 shows the binding between Parkin and Pael receptor.
- FIG. 2A shows the binding of Parkin and Parkin mutant to Pael receptor.
- FIG. 2B is a diagram showing Parkin and Parkin mutants used in an experiment for examining binding between Parkin and Parkin mutants and Pael receptor.
- FIG. 3 is a diagram showing the binding of endogenous Parkin and endogenous Pael receptor in brain tissue and cultured cells.
- FIG. 4 is a diagram showing the results of a study of ubiquitination of Pael receptors.
- FIG. 5 shows the results of an examination of the binding between Parkin and endoplasmic reticulum-associated E2.
- FIG. 6 is a diagram showing the results of Invitro ubiquitination assay of Pael receptor using endogenous Parkin derived from cultured cells.
- FIG. 7 is a diagram showing the results of in vitro ubiquitination assay using recombinant Parkin and E2.
- FIG. 8 is a diagram showing the results of in vitro ubiquitine-silhouette assay using the Pael receptor and its homolog as substrates.
- FIG. 9A is a diagram showing the results of detection by radioautography in a pulse-chase experiment for confirming whether Parkin degrades Pael receptors in the ubiquitin proteasome system.
- FIG. 9B is a diagram showing the results of quantification by phospho imagin in a pulse-chase experiment for confirming whether or not Parkin degrades the Pael receptor in the ubiquitin proteasome system.
- FIG. 10 is a diagram showing that Pael receptors easily fail to fold and are insolubilized by endoplasmic reticulum stress.
- FIG. 4 is a diagram showing the results of studies on the effects of UPR inducer and UPR.
- FIG. 12 is a photograph showing the morphology of dead cells expressing the Pael receptor.
- FIG. 13 is a photograph showing the immunolocalization of Pael receptors overexpressed in SH-SY5Y cells.
- FIG. 14 is a photograph showing Pael receptor intracellular inclusions.
- FIG. 15 is a diagram showing the inhibition of cell death caused by Parkin's unfolded Pael receptor.
- FIG. 16 is a graph showing Parkin's inhibition of cell death caused by unfolded Pael receptors.
- FIG. 17A shows the results of Western blotting for detecting the amount of endogenous Pael receptor in human brain.
- FIG. 17B shows the relative values of the amount of endogenous Pael receptor in the human brain.
- FIG. 18 shows the results of Western blot analysis of total proteins derived from soluble or 10 g insoluble fractions.
- FIG. 19 is a diagram showing the results of RT-PCR using total RNA extracted from SH-SY5Y cells and 293T cells as type III.
- FIG. 20 is a diagram showing the specificity of the anti-Pael receptor antibody.
- FIG. 21 is a photograph showing Pael receptor expression in the brain.
- plasmids, antibodies and cultured cells were prepared as follows.
- UBC6AC putative membrane insertion site of UBC6
- Anti-Myc (9E10), anti-HA (Y-ll), anti-UM auitin (FL-76), anti-BiP (N-20) and anti-actin (C-2) antibodies were purchased from Santa Cruz Biotec.
- Anti-FLAG (M2), anti-HA (3F10), anti-Ubicjuitin (1B3), anti-GluR4 (AB1508) and anti-NSE (BBS / NC / VI-H14) are available from Sigma, Roche Diagnostics, MBL (Nagoya, Japan, respectively). ), Purchased from Chemicon and Dako.
- Anti-UCH-L1 antibody was distributed by Dr. Keiji Wada (National Center of Neurology). Human embryonic kidney-derived 293T and neuroblastoma-derived SH-SY5Y cells were subjected to gene transfer, immunoprecipitation, western plot, immunocytochemistry and cell death assays as described in Imai et al., 2000. .
- Yeast two-hybrid screening, immunoprecipitation and Western blot analysis, immunochemical analysis, pulse-chase experiment, in vitro ubiquitination assay and RT-PCR were performed as follows.
- Plasmid PGBT9 (Clontech) into which the full-length human Parkin cDNA was inserted was created as a library screening patent.
- the yeast two-hybrid screening was performed using a human adult whole brain cDNA library inserted into pACT2 (Clontech) and a human midbrain substantia nigra cDNA library inserted into pGAD424 (prepared by our laboratory). Was performed on a mixture of Library screening was performed according to the instructions for use of the Clontech Matchmaker Two-Hybrid System Kit.
- Cells were lysed in cell lysis buffer (20 mM HEPES, H 7.4, 120 mM NaCl, 5 mM EDTA, 1
- Immunoprecipitation was performed by a modification of 83, 121-127. That is, the suspension is 15,000 xg for 30 minutes Was separated by centrifugation. The supernatant from the 1% Triton X100 soluble fraction was directly subjected to immunoprecipitation. The insoluble pellet fraction was washed four times with ice-cold cell lysis buffer. Thereafter, the cells were lysed in a cell lysis buffer containing 1% sodium lauryl sulfate (SDS) at a final concentration of 60% for 1 hour. A 10-fold volume of lysis buffer containing 10 iM MgCl 2 and 25 g / ml DNase I was added, and the reaction was carried out for 37, 10 minutes.
- SDS sodium lauryl sulfate
- the supernatant from the insoluble fraction of Triton X 100 contains various antibodies and protein G-coupled or protein A / G (50 / 5O3 ⁇ 4) -coupled Sepharose beads (Amersham -Pharmacia), and the immunoprecipitate was washed four times with a cell lysis buffer solution without Complete Protease Inhibitors.
- the 1 Triton X100 soluble and insoluble fractions of the total cell extract, or the 1% Triton X100 soluble and insoluble fraction-derived immunoprecipitates were purified by Western blot using ECL detection reagent (Amersham-Pharmacia). Blot analysis was performed. For protein quantification, Coomassie protein assay reagent (Pierce) was used.
- SH-SY5Y cells seeded on 8-well chamber slides contained one human Pael receptor expression vector or calreticul in ER localization sequence or human / 31,4- The gene was introduced in combination with 0.3 ⁇ g of a red fluorescent protein expression vector (pDsRecH-Nl, Clontech) having a Golgi localization sequence of galactosyltransferase. After 20 hours of culture, cells were exposed to 20 M lactacystin for 16 hours. The cells were washed with phosphate buffered saline and fixed with 0.2% dulaldehyde and 2% formaldehyde.
- pDsRecH-Nl red fluorescent protein expression vector
- SH-SY5Y cells were transfected with a Pael receptor with a FLAG tag at the carboxyl terminus (Pael receptor-FLAG) and Parkin expression plasmid or control plasmid. After 36 hours, cells were incubated in Dulbecco's modified Eagle's medium (M / C-iree DMEM) containing 5% fetal calf serum (FCS) and without methionine / cystine, in the presence or absence of 10 M lactin cystine. The cells were cultured for 1 hour in the presence condition. The cells were then plated in M / C-free DMEM containing 5% FCS in the presence or absence of 10 M laxyl cystine.
- M / C-iree DMEM Dulbecco's modified Eagle's medium
- FCS fetal calf serum
- Ci / ml 35 S-methionine / cystine was added 37 and labeled for 30 minutes. The cells were then washed and cultured in Dulbecco's modified Eagle's medium containing 10% FCS in the presence or absence of 10 / xM lactone cystine for up to 3 hours. After each time in the chase, the cells were lysed, subjected to immunoprecipitation on an anti-FLAG M2 affinity gel (Sigma), separated by SDS-polyacrylamide gel electrophoresis, and then image-analyzed (BAS-5000). ; Fuji film). The medium-bolic-labeled Pael receptor was quantified using Image Gauge software (Fujiiilm).
- 35 S-labeled Pael valley-FLAG was prepared using TNT quick coupled transcription / translation systems (Promega) in the presence and absence of canine pancreatic microsomal membranes (Promega), and anti-FLAG M2 Immunoprecipitated on affinity gel. Both Pael receptors created in the presence and absence of microsomal membranes could be used as substrates for in vitro ubiquitination assays without distinction, so they were created in the absence of microsomal membranes. Pael receptors were used for most of Atsushi. In Vitro Ubiquitination Atsushi was performed according to the method described in Imai, Y. et al. (2000) J Biol Chem 275, 3566, 35664 except that 167 pmol of Sigma Ubiquitin was used. CRT-PCR]
- the primers used for PCR are as follows.
- Pael receptor forward primer 5, -CCTCCAGCTCTTCCTTCAGA-3 '; Pael receptor reverse primer, 5' -TTTCTGCCGGAGCTCGGCCA-3 '; Parkin forward primer, 5, -G GAGGCGACGACCCCAGAAAC-3'; Parkin reverse primer, 5, -GGGACAGCCAGCCACACAA GG-3 '; i3-actin forward primer, 5, -CAAGGCCAACCGCGAGAAGA-3'; / 3-actin reverse primer, 5, -GGAAGGCTGGAAGAGTGCCT-3 '.
- RNA quality was confirmed using 3_actin messenger RNA.
- a human brain cDNA library was screened using Parkin as a yeast by the yeast two-hybrid method. Positive clones obtained by screening 8.5 million independent clones were found by BLAST database search to encode a part of the homologue of endocrine receptor type B that is G-protein coupled. (Donohue, PJ et al., (1998) Brain Res Mol Brain Res
- Pael Parkin-associated endothelin receptor-like
- the carboxyl terminal site (541-600 amino residues) of the mouse Pael receptor was expressed in E. coli as a GST fusion protein.
- Anti-Pael receptor polyclonal antibodies were raised against the recombinant protein without the GST moiety.
- Anti-Parkin monoclonal antibody was raised against recombinant 6 ⁇ His-tagged Human Parkin protein expressed in E. coli.
- An anti-human Pael receptor monoclonal antibody was produced using 293T cells overexpressing human Pael receptor as an antigen.
- FIG. 2 shows the results of a study of binding between Parkin and a mutant of Parkin and Pael receptor.
- Parkin's C-terminal portion (217-465 amino acids) and Parkin's total length were co-precipitated with the Pael receptor with the same efficiency. Or, they did not co-precipitate (Fig. 2).
- the schematic diagram at the bottom right shows Parkin and variants of Parkin used to identify the binding region of the Pael receptor.
- the numbers in parentheses correspond to the amino residues encoded by the Parkin protein.
- An asterisk (*) indicates a point mutation site.
- Ubl, ubiquitin-like region c RING means RING-finger motif exertIBR means in between RING fingers, indicating that the C-terminal part of Parkin is essential for binding to Pael receptor.
- FIG. 3 shows the results of a study on the binding of endogenous Parkin and endogenous Pael receptor in brain tissue and cultured cells.
- Pael receptor immunopositive bands were co-precipitated with endogenous Parkin.
- an asterisk (*) indicates an anti-Pael receptor antibody-reactive band of about 120 kDa. This band is often observed in vivo, but may represent one state of the unidentified Pae1 receptor.
- HA-tagged ubiquitin (HA-Ub) was overexpressed in 293T cells together with a FLAG-tagged Pael receptor and immunoprecipitated with anti-FLAG antibody.
- Vectors without gene insertion (Control) or Pael receptor -FLAG are HA-tagged Ub (HA-
- ERAD degrades membrane proteins and secretory proteins that have failed to fold by a degradation system in the cytoplasm (Pie Imer, RK et al., (1999) Trends Biochem Sc 24, 266-270). Retrograde transport through the endoplasmic reticulum membrane to the cytoplasm where it is ubiquitinated and degraded by the action of UBC6, UBC7, and the proteasome complex (Biederer, T. et al., (1997) Science 278, 1806) -1809; Bordallo, J. et al., (1998) ol Biol Cell 9, 209-222; Gilon, T. et al., (2000) Mol Cell Biol 20, 7214-7219; Wilhovsky, S. et al.
- Parkin is a RING-type E3 that is up-regulated by UPR, indicating that it may be involved in ERAD, we linked Parkin to ER-associated E2.
- Co-precipitation was attempted by co-expressing various Myc-tagged E2 plasmids with FLAG-tagged Parkin in human 293T cells.
- Vectors without gene insertion or FLAG-Parkin cDNA can be used in combination with vector-only (-), Myc-tagged UBC6 (Myc-UBC6), Myc-UBC7, Myc-UBCH6 or Myc_E2-25K, and 293T The cells were transfected.
- Immunoprecipitate (FLAG-IP) and soluble total cell extract (Total lysate) immunoprecipitated with anti-FLAG monoclonal antibody were analyzed by Western blot using anti-FLAG or anti-Myc antibody (WB) .
- the results showed that Parkin binds to endoplasmic reticulum-associated E2, UBC6, and UBC7, but does not bind to E2 (UbcH6, E2-25K) used as a control in cells (Fig. 5).
- GST-AE4 which is a fusion protein of E. coli with GST-parkin and exon 4-deficient Parkin found in AR-JP patients as a fusion protein with GST, was used as an E3 in E. coli.
- Ubiquitination was performed.
- the Pael receptor is a membrane protein of evening eve that is incorporated, and the newly formed abnormal Pael receptor is expected to be degraded by ERAD, so UbcH7 is known to act as E2 of Parkin in this atsey.
- UBC6 or UBC6AC excluding the hydrophobic carboxyl terminal region that enters the membrane; 288 amino acids
- UBC7 which are ER-related E2s, were used.
- the expression plasmid for Pael receptor-FLAG was transfected into SH-SY5Y cells in combination with a vector without gene insertion (Control) or a FLAG-parkin expression plasmid, and then the cells were cultured in the presence of 10 _tM lactocystin or The cells were cultured in the absence condition.
- Lactacystin reduced the rate of Pael receptor degradation in control cells as well as in cells overexpressing Parkin, with 54% and 58% ureael receptors remaining after 180 minutes, respectively. In contrast, degradation of Pael receptors in Parkin-overexpressing cells was markedly enhanced, with only 0.8% remaining after 180 minutes. These results indicate that Park in degrades Pae1 receptor through the ubiquitin proteasome proteolytic system.
- Pael receptors are highly ubiquitinated when overexpressed in cultured cells, even in the absence of proteasome inhibitors (Figure 4). This finding is still highly ubiquitous It is reminiscent of findings at the CFTR and ⁇ -Obioid receptors that are phosphorylated. 60% of the 75 neoplastic ⁇ 5 obioid receptors of the neonatal CFTR fail to fold in the endoplasmic reticulum (Jensen, TJ et al., (1995) Cell 83, 129-135; Petaja-Repo, UE et al., (2001) ) J Biol Cheni 276, 4416-4423; Ward, CL et al., (1995) Cell 83, 121-127).
- Such proteins are transported retrograde from the endoplasmic reticulum to the cytoplasm through translocons (channels specific to the endoplasmic reticulum) composed of Sec61p etc. (Plemper, RK et al., (1999) Trends Biochem Sci. 24, 266-270) 0 These proteins are subsequently processed by the endoplasmic reticulum-associated proteolysis system (ERA D), which depends on the cytoplasmic ubiquitin proteasome system.
- ERA D endoplasmic reticulum-associated proteolysis system
- SH-SY5Y cells were transfected with a gene-free vector (-) or a Pael receptor expression plasmid (+) and cultured for 20 hours. The cells were then cultured for 16 hours in the absence or presence of lactacystin (IOM), in the presence of tunicamycin (l ⁇ g / ml) or 2-mercaptophenol (2-ME; 1 mM). Cells were lysed in a buffer containing 1% Triton X-100 and fractionated by the method described by Ward et al., 1995 Cell 83, 121-127. Each fraction was blotted with an antibody against the protein shown in FIG.
- IOM lactacystin
- Insoluble Pael receptors were immunoprecipitated from the insoluble fraction of the same sample as described above and analyzed with anti-Ub polyclonal antibody (FIG. 10).
- Pael receptor cDNA was not transfected into SH-SY5Y cells (1), (+), and Triton-X100 insoluble and soluble fractions were subjected to Western blotting under various conditions. . Even without any treatment, the amount in the insoluble fraction of the Pael receptor was already comparable to the amount in the soluble fraction.
- Pael receptors in the insoluble fraction with the proteasome inhibitor lactate cystine or tunicamycin (an inhibitor of saccharification) and 2-ME (a reducing agent) that cause UPR increased with a shift in high molecular weight.
- the insoluble Pael receptor was extracted from the insoluble fraction of the same sample, and the presence or absence of ubiquitination was examined using an antibody.
- immunoprecipitation of Pael receptor from the insoluble fraction A high molecular weight band ubiquitinated was detected by Western blotting using the anti-ubiquitin antibody. In contrast, no such high molecular weight band was observed in the sample not treated with the drug.
- the Pael receptor is highly ubiquitinated (Fig. 4) and the expression of BiP is increased when the insoluble Pael receptor accumulates (Fig. 10).
- Cell death that occurs specifically with the accumulation of DNA was predicted to be misfolded protein-induced vesicle death.
- SH-SY5Y cells were transfected with the expression plasmid of enhanced green fluorescent protein (EGFP) and the transfection vector (beginning with no gene insertion (-) or the plasmid expressing Pael receptor (+)) in the presence of lactacystin ( The cells were cultured for 16 hours in the absence (L20M), in the absence of tunicamycin (Tm, 5 xg / ml) or in the presence of 2-ME (2 mM). Cell death was counted by the method described in Imai, Y. et al. (2000) J Biol Chem 275, 3566, 35664. In FIG. 11, the error line indicates the standard deviation (S.D.) calculated from three experiments.
- EGFP enhanced green fluorescent protein
- Tm tunicamycin
- 2-ME 2-ME
- FIG. 12 shows the morphology of dead cells expressing the Pael receptor.
- SH-SY5Y cells were transfected with the plasmid expressing the Pael receptor and cultured in the absence and presence of lactin cystine.
- Cells that expressed the Pael receptor were visualized with an anti-Pael receptor monoclonal antibody (green, cells that look white at the top and bottom of the left figure) and were 4 ', 6-diamidino-2-phenyl indo Cell nuclei were counterstained with le (blue, gray cells).
- Dead cells expressing the Pael receptor and causing pyknosis are indicated by arrowheads.
- FIG. 13 shows the immunolocalization of Pael receptors overexpressed in SH-SY5Y cells.
- SH-SY5Y cells were transfected with Pael receptor expression plasmid and cultured for 6 hours in the presence (upper) of lactin cystine (middle, lower).
- SH-SY5Y cells transfected with Pael receptor plasmid were cultured under the conditions of lactacystin (+) or (1), and immunocytochemistry was performed with antibodies against Pael receptor or BiP.
- Pael receptor was found mainly on the surface of untreated SH-SY5Y cells, although it was partially found in the perinuclear and cytoplasmic regions, and was considered to be a cell membrane protein.
- treatment with lactin cystine for 6 hours causes Pael receptors to accumulate in the endoplasmic reticulum and block its expression on the cell membrane.
- FIG. 14 shows Pael receptor intracellular inclusions. At this point, the cell body has rolled up and appears to be about to die. You. SH-SY5Y cells transfected with the Pael receptor expression plasmid were cultured in the presence of lacstein cystine for the indicated times. The localization of the Pael receptor in the cells was visualized with an anti-Pael receptor monoclonal antibody (green, white part in the figure). The perinuclear Pael receptor inclusions are indicated by arrowheads.
- Parkin suppresses unfolded protein-induced cell death, it was predicted that overexpression of Parkin might rescue cells from cell death due to Pael receptor overexpression, and vector plasmid was added to SH-SY5Y cells.
- vector plasmid was added to SH-SY5Y cells.
- Vector (-) or Pael receptor-HA expression plasmid (+) without gene insertion was transferred to control vector (Control) or FLAG- Parkin (Wild type), FLAG-AE4,, FLAG-T240R or FUG-Parkin.
- SH-SY5Y cells transfected in combination with -C expression plasmid are solubilized and separated into 1% Triton X100 soluble (S) or 1% Triton X100 insoluble (I) fractions, and anti-FLAG monoclonal Immunoprecipitated with antibody (IP).
- IP anti-FLAG monoclonal Immunoprecipitated with antibody
- the polyubiquitinated Pael receptor was confirmed by ⁇ stanblotting the same membrane with an anti-Ub antibody (data not shown) and was designated as UbfPael receptor.
- the combination of expression plasmids was transfected into SH-SY5Y cells together with the EGFP expression plasmid as a repo overnight, and cultured for 48 hours. Cell death counts were performed in a manner similar to the study shown in Figure 11 for results. The results are shown in FIGS. 15 and 16. Consistent with the results shown in FIGS. 1-3, soluble Pael receptors were specifically co-precipitated by immunoprecipitation of soluble fractions of Park in, Parkin-C and partially T240R point mutants.
- the results of the insoluble fraction also confirmed the co-precipitation of the Pael receptor with Parkin, Parkin-C and partially the T240R point mutant.
- the Pael receptor co-precipitated with FLAG-Parkin or a mutant thereof became a smear-like band with a high molecular weight shift, and was considered to be ubiquitinated.
- the amount of Pael receptor in the insoluble fraction was significantly reduced in the presence of wild-type Parkin.
- the effect of Parkin on reducing insoluble Pael receptors was partially or completely abolished with the mutant Parkin, ie, T240R, Parkin-C or ⁇ 4.
- SH-SY5Y cells and 293T cells are divided into Triton X100 soluble or insoluble fractions, and are anti-Pael receptor monoclonal antibodies (clone 1, P) or of the same isotype.
- Control IgG mouse IgG2b
- the Pael receptor immunoprecipitated from the soluble fraction of the control and AR-JP samples was 0.4-1.0-fold higher than the control sample (Normal 1), with no difference.
- Pael receptors showed a 12-35 fold increase in AR-JP brain compared to control brain (Normal 1).
- SH-SY5Y cells and 293T cells (293T cells have Parkin mRNA but Pael receptor mRNA, but both soluble and insoluble fractions were prepared and analyzed in the same manner. It was found in the Pael receptor immunoprecipitate of the soluble fraction of SY5Y cells, but not in the Pael receptor immunoprecipitate of the soluble fraction of 293T cells. This is a result that guarantees the specificity of the receptor antibody.
- Pael receptor As with normal brain homogenate, only a very small amount of Pael receptor could be extracted from the insoluble fraction of SH-SY5Y cells. This suggests that normal levels of Pael receptor expression do not result in accumulation of insoluble Pael receptor. Furthermore, in normal and AR-JP brains, immunoprecipitates of Pael receptor were examined with anti-ubiquitin antibodies, but no ubiquitinated Pael receptor was found.
- Pael receptor was expressed on dopamine neurons in the nigral compact zone that specifically degenerate and die in Parkinson's disease.
- antiserum against Pael receptor was prepared. This antiserum recognizes mouse and human Pael receptors,
- FIG. 20 shows the specificity of the anti-Pael receptor antibody. 293T overexpressing mouse, human Pael receptor-FLAG or ETB-LP-2-FLAG (LP-2) Cell extracts were analyzed by Western blot with anti-FLAG antibody (left) or anti-Pael receptor antibody (right).
- FIG. 21 shows the results of immunohistochemical analysis.
- a to D in Fig. 21 show Pael receptor (A, green, the white stained portion in Fig. 21A) and tyrosine hydroxylase (B, B) in sections sliced along the crown of the mouse brain. Red, the white spots in Figure 21B). Yellow indicates that tyrosine hydroxylase-positive neuronal cells in the substantia nigra express Pael receptors (C and!).
- FIG. Overlaps with the part that is stained white.
- Figure 21D is the part that appears to be white).
- Pa e1 receptors are mainly expressed on oligodendrocytes in the brain.
- E and G In serial sections (A-D), yellow color indicates that CNPase-positive cells (red) express Pael receptor (green).
- F and G Localization of Pafrl receptor (green) and NeuN (F, red) or CNPase (G, red) in the cerebral cortex.
- Pael receptors are widely expressed in the brain, including the substantia nigra (Fig. 21A). Most Pael receptors were CNPase-positive oligodendrocytes
- the present inventors identified a putative seven-transmembrane protein that binds to Parkin, which was named Pael receptor, and clarified its characteristics. Based on the following facts, the present inventors have concluded that this protein is the original substrate protein of Parkin in vivo.
- Parkin is considered to be involved in ERAD because UPR increases expression with BiP by UPR, and binds to ER-associated E2, UBC6 and UBC7.
- the Pael receptor is specifically ubiquitinated in vitro by the Parkin-dependent ubiquitination pathway in the presence of UBC6 and UBC7.
- Pael receptor degradation is promoted by overexpressing Parkin in cells.
- the Pael receptor protein AR-JP accumulates in the detergent-insoluble fraction of the brain.
- Parkin appears to prevent aggregation of Pael receptors translocated from the endoplasmic reticulum to the cytoplasm by moving the degradation system and suppressing cell death.
- Parkin may suppress endoplasmic reticulum stress by promoting retrograde transport of Pael receptors from the endoplasmic reticulum in cooperation with trans-mouth complex and proteasome complex.
- the pathological feature of AR-JP is the absence of Lewy bodies, which is well explained by the hypothesis that Pael receptor accumulation is a factor in the development of AR-JP.
- the putative Pael receptor a membrane protein, is apparently retained in the endoplasmic reticulum by treatment with the proteasome inhibitors lactate cystine and UPR inducers, suggesting that inefficient folding of the Pae1 receptor. Is shown.
- the cells are recruited by the UPR to molecular chaperones or E-cells.
- Pael receptor mRNA is highly expressed, especially in the central nervous system. In the brain, Pael receptors are highly expressed, especially in the corpus callosum and substantia nigra (Donohue, PJ et al, (1998) Brain Res Mol Brain Res 54, 152-160; Zeng, Z. et al., (1997) Biochem Biophys Res Commun 233, 559-567) 0 In this study, we examined the immunohistochemical distribution of Pael receptors in mouse brain using antiserum that specifically recognizes Pael receptors.
- the Pael receptor of the present invention is a substrate for Parkin, and the accumulation of the Pael receptor is a factor in the development of AR-JP. Therefore, the pathogenesis of Parkinson's disease can be elucidated using cells and transgenic animals that express the Pael receptor of the present invention, and the amount of Pael receptor for developing a therapeutic agent for Parkinson's disease can be determined. Thus, a screening system using the index as an index can be obtained. Further, the Pael receptor gene can be a target of genetic diagnosis as a risk factor for the development of Parkinson's disease, and it is possible to perform a genetic diagnosis using all or a part of the Pael receptor gene of the present invention. Furthermore, antibodies specific to the Pael receptor of the present invention can also be used for diagnosis, elucidation of the cause of Parkinson's disease, and the like.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/482,028 US20060051835A1 (en) | 2001-06-28 | 2002-06-28 | Pael receptor, cells and animal expressing pael receptor and method of screning remedy for parkinson's disease |
EP02738872A EP1416272A4 (en) | 2001-06-28 | 2002-06-28 | PAEL RECEPTOR, THESE EXPRESSING CELLS OR EXPRESSIVE ANIMAL AND SCREENING PROCEDURE FOR A MEANS AGAINST MORBUS PARKINSON |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-197185 | 2001-06-28 | ||
JP2001197185A JP2003018992A (ja) | 2001-06-28 | 2001-06-28 | Pael受容体、Pael受容体発現細胞および動物、ならびにパーキンソン病治療薬のスクリーニング法 |
Publications (1)
Publication Number | Publication Date |
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WO2003003010A1 true WO2003003010A1 (fr) | 2003-01-09 |
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ID=19034834
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2002/006587 WO2003003010A1 (fr) | 2001-06-28 | 2002-06-28 | Recepteur pael, cellules et animal exprimant ce recepteur pael et methode de selection d'un remede contre la maladie de parkinson |
Country Status (4)
Country | Link |
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US (1) | US20060051835A1 (ja) |
EP (1) | EP1416272A4 (ja) |
JP (1) | JP2003018992A (ja) |
WO (1) | WO2003003010A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004013637A1 (en) * | 2002-08-01 | 2004-02-12 | Bayer Healthcare Ag | Diagnostics and therapeutics for diseases associated with g-protein coupled receptor 37 (gpr37) |
WO2013092923A2 (en) | 2011-12-22 | 2013-06-27 | Thermo Fisher Scientific (Bremen) Gmbh | Collision cell for tandem mass spectrometry |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005103681A1 (en) * | 2004-04-24 | 2005-11-03 | Bayer Healthcare Ag | Diagnostics and therapeutics for diseases associated with endothelin receptor type b-like protein 1(etbr-lp-1) |
US8017348B1 (en) | 2005-12-12 | 2011-09-13 | Elan Pharma International Limited | Assay for Parkinson's Disease therapeutics |
US20090317825A1 (en) * | 2005-12-12 | 2009-12-24 | Elan Pharma International Limited | Assay for parkinson's disease therapeutics and enzymatically active parkin preparations useful therein |
US8062839B2 (en) | 2007-05-21 | 2011-11-22 | Elan Pharma International Limited | Parkin substrate and assay |
CN102959400B (zh) * | 2010-06-25 | 2015-09-30 | 日本脏器制药株式会社 | 受试物质的判定或评价方法 |
JP5988101B2 (ja) | 2011-01-21 | 2016-09-07 | 国立研究開発法人理化学研究所 | 酸化ストレスインジケーター発現用核酸構築物とその使用 |
JP7203367B2 (ja) * | 2017-12-14 | 2023-01-16 | 公益財団法人実験動物中央研究所 | 哺乳動物細胞用遺伝子導入ベクター |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996011946A1 (en) * | 1994-10-17 | 1996-04-25 | Human Genome Sciences, Inc. | Human endothelin-bombesin receptor |
WO2000022129A1 (en) * | 1998-10-13 | 2000-04-20 | Arena Pharmaceuticals, Inc. | Non-endogenous, constitutively activated human g protein-coupled receptors |
Family Cites Families (1)
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US5750370A (en) * | 1995-06-06 | 1998-05-12 | Human Genome Sciences, Inc. | Nucleic acid encoding human endothlein-bombesin receptor and method of producing the receptor |
-
2001
- 2001-06-28 JP JP2001197185A patent/JP2003018992A/ja active Pending
-
2002
- 2002-06-28 EP EP02738872A patent/EP1416272A4/en not_active Withdrawn
- 2002-06-28 US US10/482,028 patent/US20060051835A1/en not_active Abandoned
- 2002-06-28 WO PCT/JP2002/006587 patent/WO2003003010A1/ja not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996011946A1 (en) * | 1994-10-17 | 1996-04-25 | Human Genome Sciences, Inc. | Human endothelin-bombesin receptor |
WO2000022129A1 (en) * | 1998-10-13 | 2000-04-20 | Arena Pharmaceuticals, Inc. | Non-endogenous, constitutively activated human g protein-coupled receptors |
Non-Patent Citations (2)
Title |
---|
IMAI Y. ET AL.: "An unfolded putative transmembrane polypeptide, which can lead to endoplasmic reticulum stress, is a substrate of Parkin", CELL, vol. 105, no. 7, 29 June 2001 (2001-06-29), pages 891 - 902, XP002955890 * |
See also references of EP1416272A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004013637A1 (en) * | 2002-08-01 | 2004-02-12 | Bayer Healthcare Ag | Diagnostics and therapeutics for diseases associated with g-protein coupled receptor 37 (gpr37) |
WO2013092923A2 (en) | 2011-12-22 | 2013-06-27 | Thermo Fisher Scientific (Bremen) Gmbh | Collision cell for tandem mass spectrometry |
DE112012005416B4 (de) | 2011-12-22 | 2020-06-18 | Thermo Fisher Scientific (Bremen) Gmbh | Kollisionszelle für Tandem-Massenspektrometrie |
Also Published As
Publication number | Publication date |
---|---|
EP1416272A4 (en) | 2005-02-09 |
US20060051835A1 (en) | 2006-03-09 |
EP1416272A1 (en) | 2004-05-06 |
JP2003018992A (ja) | 2003-01-21 |
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