WO2000044783A1 - Proteine meg 4 - Google Patents
Proteine meg 4 Download PDFInfo
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- WO2000044783A1 WO2000044783A1 PCT/JP2000/000413 JP0000413W WO0044783A1 WO 2000044783 A1 WO2000044783 A1 WO 2000044783A1 JP 0000413 W JP0000413 W JP 0000413W WO 0044783 A1 WO0044783 A1 WO 0044783A1
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- protein
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- meg
- amino acid
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Classifications
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- 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
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/05—Animals comprising random inserted nucleic acids (transgenic)
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K2217/00—Genetically modified animals
- A01K2217/07—Animals genetically altered by homologous recombination
- A01K2217/075—Animals genetically altered by homologous recombination inducing loss of function, i.e. knock out
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6883—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for diseases caused by alterations of genetic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S530/00—Chemistry: natural resins or derivatives; peptides or proteins; lignins or reaction products thereof
- Y10S530/827—Proteins from mammals or birds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S530/00—Chemistry: natural resins or derivatives; peptides or proteins; lignins or reaction products thereof
- Y10S530/827—Proteins from mammals or birds
- Y10S530/834—Urine; urinary system
- Y10S530/835—Kidney
Definitions
- the present invention belongs to the field of genetic engineering, and in particular, relates to the isolation of genes of kidney cells
- mesangial cells play a central role in maintaining the structure and function of renal glomeruli. And mesangial cells also have central pathophysiological significance in various types of nephritis. For example, proliferation of mesangial cells and accumulation of extracellular glomerular interstitial matrix are important pathological findings of glomerulosclerosis in patients with various glomerular diseases such as chronic nephritis and diabetic nephropathy. Therefore, finding genes that are expressed in mesangial cells and clarifying their functions is necessary to elucidate the biological properties of mesangial cells, to investigate the causes of diseases associated with mesangial cells, and, consequently, to relate to mesangial cells. It is effective for treating and diagnosing diseases.
- the Thyl antigen As a marker for mesangial cells, the Thyl antigen is known in rats. However, this gene is not specific to mesangial cells and is not expressed in mesangial cells in humans (Miyata T. et al., Immunology (1989) 67: 531-533; Miyata T. et al., Immunology ( 1990); 69:39 395). It is also known that mesangial cells, when activated, express sperm smooth muscle actin. Offspring are not mesangial cell-specific. Thus, there has been no report on genes characteristic of mesangial cells.
- the present inventors have previously reported megsin as a protein specifically expressed in mesangial cells (J. Clin. Invest, 1998 Aug 15, 102: 4, 828-36).
- the present invention relates to a novel protein having a structure distinctly different from that of megsin. Disclosure of the invention
- An object of the present invention is to isolate a gene that is highly expressed in mesangial cells.
- the present inventors isolated mRNA from an in vitro culture of human mesangial cells and prepared a 3 ′ cDNA library. Then, the sequences of a large number of clones are randomly determined from the cDNA library, and the nucleotide sequences are compared with the nucleotide sequences of known 3 ′ cDNA clones obtained from various organs and cells. As a result, a clone expressing in mesangial cells was selected. Among them, one of the clones with a particularly high frequency in mesangial cells was selected.
- a human ZIPLox cDNA library prepared from mesangial cells was screened, and the nucleotide sequence of the positive clone was determined. Based on the determined nucleotide sequence of the cDNA, the amino acid sequence of the longest open reading frame was determined. Several characteristic motifs were found in this amino acid sequence. In addition, homology with a known protein, mouse ATP-dependent metalloprotease (ATP-MP), was confirmed, and this amino acid sequence was encoded by the cDNA of the present invention. The amino acid sequence of the protein. The present inventors named the protein having this amino acid sequence according to the present invention Meg-4 (Meg-4).
- the nucleotide sequence of human Meg-4 cDNA is shown in SEQ ID NO: 1, and the deduced amino acid sequence of human Meg-4 is shown in SEQ ID NO: 2.
- This amino acid sequence was homology-searched with the amino acid sequence in the SwissProt database, and Meg-1 was a novel protein, a AAA protein characteristic of the AAA protein family — (ATPases associated with difierent cellular activities protein family). (Walker, JE et al. EMBO J.8, 945-951, 1982, Swaffield, JC et al. Nature, 374, 88-91, 374, Fry, DC et al. Proc. Natl. Acad. Sci.
- the present invention specifically includes the following.
- [1] a protein comprising the amino acid sequence of SEQ ID NO: 2, or an amino acid sequence in which one or more amino acids have been substituted, deleted, added, and / or inserted in these amino acid sequences, and the amino acid sequence comprises this amino acid sequence; Functionally equivalent evening protein.
- [2] The protein of [1], comprising an amino acid sequence having 90% or more homology to the amino acid sequence of SEQ ID NO: 2.
- DNA comprising the nucleotide sequence of SEQ ID NO: 1, or a DNA that specifically hybridizes to a complementary strand thereof, and has a chain length of at least 15 nucleotides.
- a vector comprising the DNA of any one of [4], [5], [6], and [7].
- [11] A transformed cell capable of expressing the DNA of any one of [4], [5], [6], and [7].
- [18] A method for detecting mesangial proliferative nephropathy by measuring the protein or fragment thereof according to [3] contained in a biological sample and comparing the measured value with a measured value obtained from a normal sample.
- the present inventors used a 3'-directed cDNA library. In this way, the effect of cDNA size on the cloning efficiency can be avoided.
- the sequence of the 3 'region is unique to each gene, and a sequence of about 200-300 bp is sufficient to characterize the gene.
- the DNA encoding human Meg-4 of the present invention can be obtained by preparing mRNA from mesangial cells and converting it to double-stranded cDNA by a known method.
- mRNA is prepared by guanidine isothiocyanate-cesium chloride method [Chirwin, et al. Biochemistr 18, 5294 (1979)], a method of treating with detergent and phenol in the presence of deoxyribonuclease [ Berger & Birkenmeier, Biochemistry 18, 5143 (1979)].
- Poly (A) NA can be prepared from total RNA by affinity chromatography using a carrier (eg, sepharose, cellulose, latex particles, etc.) to which oligo (dT) is bound.
- a carrier eg, sepharose, cellulose, latex particles, etc.
- an oligo (dT) or random primer complementary to the poly (A) chain at the 3 'end, or a synthetic oligo corresponding to a part of the amino acid sequence of Meg-14 When a nucleotide is used as a primer and treated with reverse transcriptase, a hybrid strand consisting of mRNA and its complementary DNA (cDNA) is obtained.
- a double-stranded cDNA can be obtained by treating the mRNA chain with, for example, E. coli RNase H, E. coli DNA polymerase I, and E. coli MA Ligase and replacing it with a DNA chain.
- RNA RNA
- a probe can be synthesized based on the human Meg-4 gene base sequence and the cDNA library can be directly screened to obtain the desired cDNA.
- the gene of the present invention can be selected from the genes obtained by these methods by confirming the nucleotide sequence of the gene.
- a cDNA library of human mesangial cells can be used as a type I to isolate a meg 14 phenotype as shown in SEQ ID NO: 7.
- Such phenotypes are included in Meg-14 of the present invention.
- cDNA of a homologue of Meg-14 in a species other than human, such as mouse and rat, can be obtained by the same method.
- the cDNA of the homologue of Meg-14 can be isolated by the following method. That is, using the nucleotide sequence of the human Meg-4 cDNA as a probe, the cDNA library is screened by colony hybridization and plaque hybridization to encode a homologue of Meg-4. NA can be isolated.
- the cDNA library 1 can synthesize mRNA extracted from mouse, rat tissues, cultured mesangial cells, etc. as type III. Alternatively, a commercially available cDNA library (Funakoshi, etc.) can be used.
- a method of designing a diene-enhancing primer before and after 0RF based on the cDNA of human Meg-14 according to the present invention, and amplifying a homologous cDNA by PCR using the primer can also be used.
- the AAA protein families share the AAA motif, but do not necessarily show similar sequences in other regions.
- homologues such as mouse ATP-MP described later have some similarity in regions other than the AAA motif, and can be amplified by PCR.
- the present inventor has confirmed that the cDNA fragment of the Megu4 homolog can be amplified by using the di-energetic primer not only in mice but also in rats.
- the human meg-4 genome can be obtained by screening a genomic library.
- a genomic library can be synthesized, for example, by preparing a genome from human B lymphoblasts and incorporating DNA partially digested with Sau3 into a phage vector, EMBL3 (Blood, vol 83, No. 11). , 1994: pp 3126-3131).
- a clone containing the target genome can be obtained.
- the Meg-14 gene is mapped to the short arm 10pl 1.23-12.1 of chromosome 10, the human and Meg-14 genomes can be easily isolated from a genomic clone containing this region. be able to.
- the 5 'RACE method (5'-Full RACE Core Set (Takara Shuzo Co., Ltd.)) was carried out using mRNA from human cultured mesangial cells or human kidney mRNA (purchased from Clontech) as type III. 5) UTR can be sequenced using
- the gene of the present invention can be obtained, for example, by the phosphoramidite method [Mattencci, MD & Caruthers, MHJ Am. Chem. Soc. 103, 3185 (1981)], the phosphite 'triester method [Hunkapiller, M. et al. Nature 310, 105]. (1984)] and the like.
- eukaryotic genes often show polymorphism as is known for the human interferon gene, and one or more amino acids may be substituted by this polymorphism.
- protein activity is usually maintained.
- protein activity is often maintained by modifying one or several amino acid sequences.
- SEQ ID NO: 2 All of the genes encoding proteins obtained by artificially modifying the gene encoding the amino acid sequence of the present invention have the characteristic functions of the gene of the present invention. Included in the invention.
- all proteins artificially modified from the amino acid sequence shown in SEQ ID NO: 2 are included in the present invention as long as they have the characteristics of the protein of the present invention.
- the protein of the present invention includes the amino acid sequence of SEQ ID NO: 2 or the amino acid sequence in which one or more amino acids have been substituted, deleted, added, and / or inserted in these amino acid sequences.
- proteins functionally equivalent to Meg-4 according to the present invention are proteins functionally equivalent to Meg-4 according to the present invention.
- functionally equivalent means having the same biological properties as Meg-14. The present inventors have found the following biological properties in Meg-4, for example.
- Meg-1 belongs to the AAA protein family in its structure.
- the AA protein family refers to a highly conserved AAA motif consisting of 230-250 bases (ATP-binding motif, minimal AAA protein motif) that has Mg 2+ -dependent ATPase activity. , And walker B motifs) and a metal binding motif (H EXXH).
- Some ATP-MPs are known as AAA proteins.
- their cellular localization varies. Functionally, a wide range of functions have been reported, including cell cycle control, protein degradation, organelle biosynthesis, and protein transport.
- Meg-4 The expression characteristics of Meg-4 are highly expressed in renal mesangial cells, as well as in kidney, heart, brain, placenta, skeletal muscle, and other tissues, and in lung and liver. Expression is weak. Furthermore, in cultured cancer cell lines, remarkable expression of Meg-14 is not observed.
- the expression status of Meg-14 in each tissue can be determined, for example, by performing a Northern blot assay using a probe having the nucleotide sequence selected from SEQ ID NO: 1 and using mRNA prepared from each tissue as a sample. You can know.
- the MEG 14 according to the present invention is constituted. Therefore, not only human meg 14 whose structure has been specifically clarified, but also other structurally or functionally equivalent homologues are included in the present invention.
- the amino acid sequence in which one or more amino acids are substituted, deleted, added, and / or inserted into the amino acid sequence represented by SEQ ID NO: 2 is preferably the amino acid sequence represented by SEQ ID NO: 2.
- a sequence having a homology of 90% or more with respect to the represented amino acid sequence can be given.
- Homology of the amino acid sequence is determined by FASTA. More specifically, in the amino acid sequence of SEQ ID NO: 2, a sequence in which 1 to 50 amino acids, preferably 1 to 110 amino acids are substituted with another amino acid, a deleted sequence, and an addition The inserted sequence or the inserted sequence can be indicated.
- the DNA of the present invention also includes DNAs encoding these functionally equivalent proteins.
- the DNA encoding these proteins can be not only cDNA but also genomic DNA or synthetic DNA.
- the codon for the desired amino acid is known per se, and its selection may be arbitrarily determined, for example, it can be determined according to a conventional method in consideration of the codon usage frequency of the host to be used [Grantham, R. et al. Ucleic Acids Res. 9, r43 (1981)]. Therefore, those obtained by appropriately modifying MA in consideration of the degeneracy of codons are also included in the DNA of the present invention.
- Site-specific modification using a primer consisting of a synthetic oligonucleotide coding for the desired modification 1- introduction method (.sitespecific mutagenesis) [Mark, DF et al. Proc. Nat 1. Acad. Sci. USA 81, 5662 (1984)] and the like, and the codons of these nucleic acid sequences can be partially modified.
- the DNA is Included in the DNA according to the present invention. Sequences that can hybridize to a specific sequence under stringent conditions It is likely that many have similar activity to the protein encoded by the sequence. Stringent conditions generally include the following conditions. That is, hybridization is performed at 4 x SSC at 65 ° C, and the plate is washed with 0.1 X SSC at 65 ° C for 1 hour. Temperature conditions for hybridization and washing, which greatly affect the stringency, can be adjusted according to the melting temperature ().
- Tm varies depending on the ratio of the constituent bases to the base pairs to be hybridized and the composition of the hybridization solution (salt concentration, sodium formamide-dodecyl sulfate concentration). Therefore, those skilled in the art can empirically set conditions that give equivalent stringency in consideration of these conditions.
- a DNA consisting of a base sequence having a homology of preferably 85% or more, more preferably 95 or more with respect to the base sequence shown in SEQ ID NO: 1 by FASTA or BLAST homology search. included.
- nucleotide sequence of the DNA according to the present invention can be used for various purposes based on known techniques.
- the gene encoding Meg-14 thus cloned can be transformed into other prokaryotic or eukaryotic host cells by incorporating it into an appropriate expression vector DNA. Furthermore, by introducing an appropriate promoter and a sequence relating to expression into these expression vectors, the gene can be expressed in each host cell.
- expression vectors include pET-3 [Studier & Moffatt, J. Mol. Biol. 189, 113 (1986)] for Escherichia coli, and pEF-BOS [Nucleic Acids Research for COS cells]. 18, 5322 (1990)], pSV2-gpt [Muligan & Berg, Proc. Natl. Acad. Sci.
- host cells for eukaryotic microorganisms include, for example, Saccharomyces cervisiae, and host cells derived from mammals include, for example, COS cells, CH0 cells, BHK cells, and the like. Is mentioned.
- the transformant of the present invention may be cultured by appropriately selecting culture conditions suitable for the host cell.
- the transformant transformed with the gene encoding Meg-14 as described above is cultured, and the produced Meg-14 is separated from the inside or outside of the cell and purified to a uniform protein.
- a separation and purification method used for ordinary proteins may be performed by a separation and purification method used for ordinary proteins, and is not limited at all.
- Meg-4 can be separated and purified by appropriately selecting and combining various chromatography and the like.
- a recombinant vector containing the gene, a transformant using the vector, and a processing means for gene manipulation in the process of producing Meg-4 using the gene This can be performed according to a conventional method described in “Molecular Cloning-A Laboratory Manual j (Cold Spring Harbor Laboratory, NY)”.
- a probe for detecting the Meg-14 gene can be set based on the nucleotide sequence of SEQ ID NO: 1.
- a primer for amplifying DNA or RNA containing these nucleotide sequences can be set. It is a routine matter for a person skilled in the art to set up a probe or primer based on a given sequence.
- Oligonucleotides having a set base sequence can be obtained by chemical synthesis. By adding an appropriate label to the oligonucleotide, it can be used for hybridization assays in various formats. Alternatively, it can be used for a nucleic acid synthesis reaction such as PCR. Professional It is desirable that the oligonucleotide used for the primer be at least 15 bases, preferably 25 to 50 bases in length.
- the present invention further provides an antisense nucleic acid capable of controlling the expression of Meg-14 based on the nucleotide sequence of the gene encoding Meg-4 identified by the present invention.
- the antisense nucleic acid according to the present invention is an important tool for elucidating the role of Meg_4 in mesangial cells. Alternatively, it is useful for controlling a pathological condition caused by increased expression of Meg-14.
- the antisense nucleic acid suppresses the expression of the target gene by the following factors.
- transcription initiation is inhibited by triplex formation
- transcription is suppressed by forming a hybrid with a site where an open loop structure is locally formed by RNA polymerase
- transcription is inhibited by the formation of a hybrid with A, which is undergoing synthesis, and introns are formed.
- the antisense sequence used in the present invention may suppress the expression of the target gene by any of the above actions.
- designing an antisense sequence that is complementary to the untranslated region near the 5 'end of the gene mRNA would be effective in inhibiting translation of the gene.
- sequences that are complementary to the coding region or the 3 'untranslated region may also be used. obtain.
- the DNA containing the antisense sequence of the sequence of the untranslated region as well as the translated region of the gene is also included in the antisense DNA used in the present invention.
- the antisense DNA to be used is ligated downstream of an appropriate promoter, and preferably a sequence containing a transcription termination signal is ligated on the 3 ′ side.
- the MA thus prepared can be transformed into a desired host by a known method.
- the sequence of the antisense DNA is preferably a sequence complementary to the endogenous gene (or a homologous gene thereof) of the transformed host or a part thereof, but as long as the expression of the gene can be effectively inhibited, It need not be completely complementary.
- RNA transcribed with antisense DNA as type III preferably has 90%, most preferably 95% complementarity to the transcript of the target gene.
- the length of antisense MA is at least 15 bases or more, preferably 100 bases or more, and more preferably 500 bases or more. It is. Usually, the length of the antisense UNA used is less than 2.5 kb.
- the promoter region and the enhancer region of the Meg-4 gene present in the genome can be obtained.
- the Meg-4 gene was mapped to the region of short arm 10pll .23-12.12. 1. (Fig. 4) on chromosome 10. Therefore, the promoter region of the Meg-4 gene can be obtained from a genomic clone containing the upstream region of this region by a known method.
- JP-A-6-181767 "The Journal of Immunology (1995) 155, 2477-2486, Proc. Natl. Acad. Sci. USA (1995), 92, 356 3565” and the like. These control areas can be obtained in a similar manner.
- the promoter overnight region controls the expression of the gene located upstream of the transcription initiation site
- the enhancer region controls the expression of the gene located in the intron or 3 ′ UTR.
- the promotion overnight area can be acquired, for example, by the following method.
- the enhancer region in the 3, UTR, and intron is prepared by using the Meg-14 cDNA as a probe, cloning the human Meg-14 genomic gene from the human genomic library, and using the same method as described above for the promoter. Thus, a region having an enhancer activity can be obtained.
- the transcription factors controlling the expression of the Meg-1 4 gene are described in “New Cell Engineering Experimental Protocol (Shujunsha)”, “Biomanual Series 5 Transcription Factor Research Method (Yodosha)”, “DNA And Cell Biology, 13, 731-742 (1994) ”, for example, a method using an affinity column, a Southwestern method, a footprinting method, a gel shift method, or a one-way method. It can be obtained by the hybrid method.
- a transcription factor is a factor that regulates transcription of the Meg-14 gene, and includes a transcription initiation factor that induces a transcription initiation reaction and a transcription regulatory factor that regulates transcription positively or negatively. As expected.
- a nuclear extract is applied to the column obtained by the above-mentioned method, in which the promoter region and the enhancer region are immobilized on sepharose or latex beads, and the column is washed.
- a transcription factor controlling the expression of Meg-4 gene can be obtained.
- cDNA is introduced into an expression vector of E. coli, for example, glut, a fusion protein with galactosidase is synthesized, and the fusion protein is adsorbed on a nitrocellulose membrane.
- Meg-14 gene Controlling the expression of Meg-14 gene by selecting a phage that synthesizes a fusion protein with binding activity by using a DNA fragment of the promoter region and the enhancer region labeled with a radioisotope as a probe A transcription factor can be obtained.
- the gel shift method is based on the phenomenon that when free DNA binds to a protein, it causes a difference in the electrophoretic mobility of the polyacrylamide gel.
- the DNA fragment of the promoter region and the enhancer region is used as a probe, mixed with a sample containing a transcription factor (eg, nuclear protein extract), and subjected to electrophoretic analysis under low ionic strength. Transcription factor binding is detected as a band with a different mobility than free DNA.
- the gel shift method can separate transcription factors with high sensitivity from a mixture of proteins.
- the complex of DNA and transcription factor obtained by the gel shift method is further hooded. When analyzed by the lint method, the binding site of the transcription factor can be determined.
- Footprinting utilizes the phenomenon that binding of a protein to DNA protects it from DNase I digestion. That is, the DNA of the promoter region, which is labeled with 32 P at the end, is partially digested with DNase I in the presence of a transcription factor, and separated by denaturing polyacrylamide gel for nucleotide sequence determination. Compared to the result of performing the same treatment in the absence of the transcription factor, the disappearance of the band due to the binding of the transcription factor is observed, so that the binding site can be estimated.
- the present invention also provides an antibody that recognizes Meg-4.
- the antibodies of the present invention include, for example, antibodies against a protein having the amino acid sequence of SEQ ID NO: 2.
- An antibody for example, a polyclonal antibody, a monoclonal antibody
- an antiserum against Meg-1 4 or the partial peptide of Meg-4 of the present invention can be a Meg-1 of the present invention, a partial peptide of Meg-4 of the present invention, Alternatively, it can be produced by using a fusion protein such as C-myc- (His ⁇ -Tag-Megu4 or MBP-Megu4) according to the present invention as an antigen, according to a known method for producing an antibody or antiserum.
- a peptide having low homology to other AAA families and containing an amino acid sequence of a region having hydrophilicity is useful as an immunogen.
- KDKILMG PERRSVEIDNKNK SEQ ID NO: 9
- a Meg-14-specific antibody has been obtained.
- the monoclonal antibodies of the present invention can be prepared according to the method described below.
- the meg-14 of the present invention or the partial peptide of the meg-14 of the present invention is administered to a warm-blooded animal together with a known carrier or diluent at a site where the antibody can be produced by administration.
- complete Freund's adjuvant ⁇ incomplete incomplete adjuvant may be administered.
- Administration is usually performed once every 1 to 6 weeks, for a total of 2 to 10 times.
- warm-blooded animals used for antibody production include monkeys, Examples include a heron, a dog, a guinea pig, a mouse, a rat, a sheep, a goat, and a chicken, but the mouse and the egret are preferably used.
- a warm-blooded animal immunized with the antigen for example, a mouse with an antibody titer is selected from the mouse, and the spleen or lymph node is collected 2 to 5 days after the final immunization and contained in them.
- monoclonal antibody-producing hybridomas can be prepared.
- the antibody titer in the antiserum can be measured, for example, by reacting the labeled meg 14 described below with the antiserum, and then measuring the activity of the labeling agent bound to the antibody.
- the fusion operation can be carried out according to a known method, for example, the method of Keller and Milstein (Nature, 256, 495 (1975)).
- the fusion promoter include polyethylene glycol (PEG) and Sendai virus, and PEG is preferably used.
- myeloma cells examples include X-63Ag8, NS-1, P3U1, SP2 / 0, AP-1, and the like.
- X-63Ag8 is preferably used.
- the preferred ratio between the number of antibody-producing cells (spleen cells) and the number of myeloma cells used is 1:20 to 20: 1, and PEG (preferably PEG1000 to PEG6000) is added at a concentration of about 10 to 80%. Incubation at 20 to 40 ° C, preferably 30 to 37 ° C for 1 to 10 minutes allows efficient cell fusion.
- Various methods can be used to screen anti-Meg-4 antibody-producing hybridomas.
- hybridomas can be cultured on a solid phase (eg, a microplate) adsorbed with Meg-4 antigen directly or together with a carrier.
- An anti-immunoglobulin antibody (anti-mouse immunoglobulin antibody if the cells used for cell fusion are mice) labeled with radioactive substances or enzymes is used.
- add protein A and detect the anti-Megu-4 monoclonal antibody bound to the solid phase add the hybridoma culture supernatant to the solid phase to which the anti-immunoglobulin antibody or protein A is adsorbed, and add radioactive substances or enzymes.
- selection and cloning of anti-Meg-4 monoclonal antibodies are known per se or It can be performed according to a method according to it. It is usually performed in a medium for animal cells supplemented with HAT (hypoxanthine, aminopterin, thymidine). As a medium for selection, cloning and breeding, any medium can be used as long as it can grow a hybridoma.
- HAT hypoxanthine, aminopterin, thymidine
- RPMI 1640 medium (Dainippon Pharmaceutical Co., Ltd.) containing 1-20%, preferably 10-20% fetal bovine serum, GIT medium (Wako Pure Chemical Industries, Ltd.) containing 1-10% fetal bovine serum )
- GIT medium (Wako Pure Chemical Industries, Ltd.) containing 1-10% fetal bovine serum )
- SFM-101 serum-free medium for hybridoma culture
- the culturing temperature is usually 20 to 40 ° C, preferably about 37 ° C.
- the culturing time is usually 5 days to 3 weeks, preferably 1 week to 2 weeks. Culture is usually performed under 5% carbon dioxide.
- the antibody titer of the culture supernatant of the hybridoma can be measured in the same manner as the measurement of the anti-Megu-4 antibody titer in the antiserum described above.
- Cloning can be usually performed by a method known per se, such as a semi-solid agar method or a limiting dilution method.
- the cloned hybridoma is preferably cultured in a serum-free medium, and the optimal amount is determined. Is given to the supernatant.
- the monoclonal antibody of interest can be obtained, preferably, by ascites.
- the monoclonal antibody according to the present invention can be made not to cross with other proteins by selecting an antibody that recognizes a specific epitope of Meg-14.
- the epitope represented by the amino acid sequence of at least 7 or more contiguous amino acids, preferably 10-20 amino acids, is added to the protein. It is said to show a unique epitome. Therefore, the monoclonal antibody which recognizes an epitope composed of a peptide selected from the amino acid sequence shown in SEQ ID NO: 2 and having an amino acid sequence consisting of at least 7 consecutive amino acid residues is a novel antibody of the present invention. It can be said that it is a 4-specific monoclonal antibody.
- Separation and purification of the anti-Megu-4 monoclonal antibody is performed according to the method for separation and purification of immunoglobulin in the same manner as ordinary polyclonal antibody separation and purification.
- Known purification methods include, for example, salting out, alcohol precipitation, isoelectric focusing, electrophoresis, and ionization.
- Adsorption and desorption using an exchanger (for example, DEAE), ultracentrifugation, gel filtration, antigen-binding solid phase, or an active adsorbent such as protein A or protein G collects only the antibody, dissociates the bond, and separates the antibody. Techniques such as specific purification methods to be obtained can be shown.
- the monoclonal antibody and the polyclonal antibody of the present invention that recognize meg14 thus obtained can be used for diagnosis and treatment of diseases associated with mesangial cells.
- Methods for measuring Meg-14 using these antibodies include a sandwich method for detecting a sandwich complex formed by reacting Meg-4 with an antibody bound to an insoluble carrier and a labeled antibody, and a labeling method. It is possible to show a competitive method of reacting human meg-1-4 with human-derived meg-4 in a sample competitively with an antibody and measuring human-derived meg-4 in the sample based on the amount of labeled antigen reacted with the antibody. .
- Megu-4 In the measurement of Megu-4 by the sandwich method, first, after reacting the immobilized antibody with Megu-14, the unreacted substances are completely removed by washing, and the labeled antibody is added, followed by the addition of the labeled antibody.
- a two-step method of forming a labeled antibody, or a one-step method of simultaneously mixing an immobilized antibody, a labeled antibody and Meg-14 can be used.
- Insoluble carriers used for measurement include, for example, polystyrene, polyethylene, polypropylene, polyvinyl chloride, polyester, polyacrylate, nylon, polyacetal, synthetic resins such as fluororesins, polysaccharides such as cellulose and agarose, glass, and metals. And the like.
- shape of the insoluble carrier various shapes such as tray shape, spherical shape, particle shape, fibrous shape, rod shape, disk shape, container shape, cell, test tube and the like can be used.
- the antibody-adsorbed carrier is stored in a cool place in the presence of a preservative such as sodium azide as appropriate.
- a known chemical bonding method or physical adsorption method can be used.
- a chemical bonding method for example, a method using glutaraldehyde, maleimid using N-succinimidyl-4- (N-maleimidomethyl) cyclohexane-carboxylate and N-succinimidyl-2-maleimide acetate, etc.
- Do-law, Torjecil-3- (3-Dimethylaminopropyl) carbodimid A carbodimid method using hydrochloric acid and the like can be mentioned.
- the labeling substance is not particularly limited as long as it can be used for an immunological assay. Specifically, enzymes, fluorescent substances, luminescent substances, radioactive substances, metal chelates and the like can be used.
- Preferred labeling enzymes include, for example, peroxidase, alkaline phosphatase, 5-D-galactosidase, malate dehydrogenase, pneumococcal nuclease, Deruba-5-steroid isomerase, and glycerol.
- Phosphate dehydrogenase, triosphosphate isomerase horseradish peroxidase, asparaginase, glucose oxidase, ribonuclease, urease, powerase, glucose-16 Phosphate dehydrogenase, glucoamylase, acetylcholinesterase and the like.
- Preferred fluorescent substances include, for example, full-aged restained isocyanate, phycopyri protein, rhodamine, phycoerythrin, phycocyanin, allophycocyanin, and orthophthalaldehyde.
- Preferred luminescent substances include isoluminol, lucigenin, luminol, aromatic acridinium ester, imidazole, acridinium salt and its modified ester, luciferin, luciferase, and aequorin.
- Preferred radioactive substances include 125 I, 127 I, 131 I, 14 C, 3 ⁇ 4, 32 ⁇ ⁇ ⁇ ⁇ , and 35 S.
- direct and indirect signs can be used.
- a direct labeling method a method of chemically covalently bonding an antibody or an antibody fragment and a label with a crosslinking agent is generally used.
- Crosslinking agents include ⁇ , ⁇ '-orthophenylenedimaleide, 4- ( ⁇ -maleidomethyl) cyclohexanoic acid. N-succinimide ester, 6-maleimide hexanoic acid / N-succinimide ester, 4,4'-dithioviridine, and other known crosslinking agents can be used.
- cross-linking agents and enzymes and antibodies may be performed according to a known method depending on the properties of each cross-linking agent.
- a method may be employed in which a low-molecular-weight hapten such as biotin, dinitrophenyl, pyridoxal, or fluorescamine is bound to an antibody, and the antibody is indirectly labeled with a binding component that recognizes this.
- Avidin-streptavidin is used as a recognition ligand for piotin, while antibodies recognizing these haptens are labeled for dinitrophenyl, pyridoxal or fluorescamine.
- horseradish beluoxidase can be used as a labeling enzyme.
- This enzyme is advantageous because it can react with many substrates and can be easily bound to antibodies by the periodate method.
- a fragment thereof for example, Fab ', Fab, F (ab') 2 is used as the antibody.
- Enzyme-labeled products can be obtained by the same treatment regardless of whether the antibody is a polyclonal antibody or a monoclonal antibody. If the enzyme-labeled product obtained by using the above-mentioned cross-linking agent is purified by a known method such as affinity chromatography, an immunoassay system with higher sensitivity can be obtained. The purified enzyme-labeled antibody is preserved by adding Thimerosal as a preservative and glycerin as a stabilizer. The labeled antibody can be stored for a longer period by freeze-drying and storing in a cool dark place.
- the labeling agent is an enzyme
- a substrate and, if necessary, a color former are used to measure its activity.
- a Peruokishida one zero as enzymes used 3 ⁇ 40 2 as a substrate solution
- 2 as coloring agent 2, - azino - di - [3- E chill benz thiazolium rinse sulfonic acid]
- Anmoniumu salt ABTS
- 5- Aminosalicylic acid orthophenylenediamine, 4-aminoantipyrine, 3,3,5,5, -tetramethylbenzidine and the like
- alkaline phosphatase is used as the enzyme, use orthonitrophenyl phosphite, para-nitrophenyl phosphate, etc. as the substrate. Can be.
- the present invention also provides a monoclonal antibody or a polyclonal antibody as described above which is labeled or immobilized to form a reagent for immunological measurement of Meg-14. It also includes those prepared as a kit with the indicator and control sample.
- the subject of measurement of Meg-14 in the present invention is a biological sample containing Meg-4, or a precursor or fragment of Meg-14, such as plasma, serum, blood, urine, tissue fluid, or a body fluid such as cerebrospinal fluid. It is not limited if it is.
- the present invention relates to transgenic non-human vertebrates having altered expression levels of the Meg-14 gene.
- the Meg-14 gene includes cDNA, genomic DNA or synthetic DNA encoding Meg-14. Gene expression also includes both transcription and translation steps.
- the transgenic animal according to the present invention is useful for studying the function or expression regulation of Megu4, elucidating the mechanism of diseases associated with human mesangial cells, and developing drug model animals for drug screening and safety. .
- mutation of a part of several important sites (enhancer, promoter, intron, etc.) that normally regulates the expression of the Megu4 gene is caused by deletion, substitution, insertion or the like.
- the gene can be artificially increased or decreased as compared with the original gene expression level.
- Such a modification is a regulation of transcription of the Meg-4 gene.
- protein translation can be modified by deleting a part of the exon or replacing it with a stop codon by introducing a point mutation into the translation region. This mutation can be introduced by a known method, and a transgenic animal can be obtained.
- Transgenic animals are animals in which a foreign gene has been artificially introduced into germ cells by genetic recombination in a narrow sense, and antisense RNA is used in a broad sense.
- Transgenic animals whose function of specific genes has been suppressed animals in which specific genes have been knocked out using embryonic stem cells (ES cells), and animals into which point-mutated DNA has been introduced.
- ES cells embryonic stem cells
- a transgenic animal includes all vertebrates other than humans.
- Transgenic animals can be prepared by mixing the gene and egg and treating with calcium phosphate, or by using a phase contrast microscope to nucleate the pronucleus stage egg and to transfer the gene with a micropipette.
- a direct introduction method microwave injection method, US Pat. No. 4,873,191
- ES cells embryonic stem cells
- a method of inserting a gene into a retrovirus vector and infecting the egg and a method of introducing a gene into the egg via sperm and a method of sperm vector transfer have been developed.
- the sperm vector method is a genetic recombination method in which a spontaneous gene is attached to sperm or incorporated into sperm cells by a method such as electoporation, and then fertilized by the egg to introduce the foreign gene. (M. Lavitranoet et al. Cell, 57, 717, 1989).
- site-specific gene recombination in vivo such as the cre / loxP recombinase system of bacteriophage PI and the FLP recombinase system of Saccharomyces cerevisiae, can be used.
- site-specific gene recombination in vivo such as the cre / loxP recombinase system of bacteriophage PI and the FLP recombinase system of Saccharomyces cerevisiae, can be used.
- site-specific gene recombination in vivo such as the cre / loxP recombinase system of bacteriophage PI and the FLP recombinase system of Saccharomyces cerevisiae.
- a method for producing a transgenic animal by the microinjection method is performed, for example, as follows. First, a transgene consisting essentially of a promoter involved in expression control, a gene encoding a specific protein, and a polyA signal is required. The expression style and expression level of a specific molecule are affected by the promoter activity. Format ⁇ Check the expression level. Untranslated region ⁇ Since splicing has been found to change the expression level, an intact spliced before the poly A signal May be introduced. It is important to use as pure a gene as possible to introduce into a fertilized egg. Animals used include fertilized egg collection mice (5-6 weeks old), mating male mice, pseudopregnant female mice, vasectomy male mice, and the like.
- ovulation may be induced by gonadotropin or the like.
- the fertilized egg is collected, and the gene in the injection pit is injected into the male pronucleus of the egg by the microinjection method.
- Prepare animals prseudo-pregnant female mice, etc.) for returning the injected eggs to the oviduct, and transplant about 10 to 15 animals per animal.
- the transgene was introduced into the newborn mouse, whether the genomic DNA was extracted from the tip of the tail and the transgene was detected by the Southern method or the PCR method. Selection can be made by the positive cloning method in which a gene that is activated only when the time is inserted is inserted.
- the transgene-derived transcript is detected by the Northern method or the RT-PCR method.
- detection by the Western blotting method using a specific antibody against the protein is also possible.
- the knockout mouse of the present invention has been processed so that the function of the mouse Meg-4 gene is lost.
- Knockout mice are transgenic mice in which any gene has been disrupted by homologous recombination technology and the function has been lost.
- embryonic stem cells in which one allele has been modified or destroyed can be selected to produce knockout mice.
- a genetically engineered embryonic stem cell is injected into a blastocyst or an 8-cell embryo of a fertilized egg to obtain a chimeric mouse in which cells derived from embryonic stem cells and cells derived from an embryo are mixed.
- this chimeric mouse (a chimera is a single individual formed from somatic cells based on two or more fertilized eggs) is bred to a normal mouse, a heterozygous cell in which all of one allele has been altered or destroyed A zygote mouse can be produced. Furthermore, by crossing heterozygous mice, homozygous mice can be produced.
- the transgenic animal according to the present invention It includes both mouthpieces and homozygotes.
- Homologous recombination refers to recombination that occurs between two genes having the same or very similar nucleotide sequences in the gene recombination mechanism.
- PCR can be used to select cells that have undergone homologous recombination.
- a PCR reaction was performed using a part of the inserted gene and a part of the region expected to be inserted as a primer, and it was found that homologous recombination had occurred in the cells in which the amplification product was produced.
- a neomycin resistance gene can be linked to the introduced gene, and the cells can be selected by making the cells neomycin resistant after introduction. The method can be easily selected using the methods described above and their modifications.
- FIG. 1 is a diagram summarizing the results of motif search of Meg-1 by PSORT II (PSORT WWW Server, http://psort.nibb.ac.jp:8800/). The bases of the DNA are shown with the translation start position as 1.
- FIG. 2 is a photograph showing the results of Western blot analysis using a Meg-4 peptide antibody. Each lane corresponds to the next antigen. M indicates a molecular weight marker. Lane 1: MBP-expressing Escherichia coli cell lysate (anti-Meg-4 peptide IgG)
- Lane 4 Cell lysate of E. coli expressing MBP-Meg-4 (normal Eg IgG)
- FIG. 3 is a fluorescence micrograph showing the results of chromosome analysis by the FISH method using Meg-4c DNA as a probe. The portion indicated by the white arrow is the signal detected by Meg-1cDNA.
- FIG. 4 is an idea showing the position of lOpll.23-12.1, which is the localization site of the Meg-14 gene. Both ideas are based on international nomenclature. BEST MODE FOR CARRYING OUT THE INVENTION
- Human glomerular kidney mesangial cells were isolated from normal human kidneys isolated from a 58-year-old man.
- the renal cortex was isolated under aseptic conditions, minced, and passed through several sieves. The sieve used was gradually reduced in pore size.
- the glomeruli trapped on a sieve having a pore size of 75 to 200 / m were washed and incubated with 100 ⁇ g / ml collagenase (Washington Biochemical) at 37 ° C for 20 minutes.
- RNA pellet was dissolved in TE buffer.
- Poly (A) + RNA was separated using an oligo dT cellulose column (Pharmacia).
- cDNA synthesis was performed using pUC19-based vector primer [Norrander J., et al., Gene, 26, l (U-106 (1983)]). This vector had a Hindi terminus and a Pstl terminus with a T tail, and was dam-methylated at the Mbol site (GATC). After synthesis, the cDNA sequence and the single BamHI site in the vector lacZ gene were cut with bol and BamHI, respectively, followed by circularization and ligation at low DNA concentrations.
- an input ZIPLox cDNA library was synthesized using an oligo dT primer and a random primer.
- a commercially available ZIPLox manufactured by Gibco BRL, trade name ZIPLox EcoRI Arms
- the inserted ZIPLox cDNA library was screened using the insert as a probe.
- the nucleotide sequence of the inserted gene fragment was determined by the dideoxy luminescence method.
- Meg-14 was a novel protein.
- mouse ATP-MP was confirmed as a protein having homology.
- Meg-1 and ATP-MP have 89.8% amino acid sequence and 81,7% homology in the base sequence of cDNA.
- 58 amino acid residues were inserted in Meg4.
- ATP-MP was speculated to be a homologue of Meg-14 in the mouse.
- the AAA motif characteristic of the A protein is a conserved amino acid sequence in plants, bacteria, mammals and many species. Therefore, the AAA protein family is presumed to be a protein with important functions that support basic cellular functions. Therefore, the fact that Meg-14 having the above characteristics is highly expressed in mesangial cells suggests that this protein plays an important role in maintaining the morphology and function of kidney cells. On the other hand, some proteases are produced in renal mesangial cells, which are considered to be responsible for some of the cell functions. Meg-4 may have protease activity from the characteristics of its gene structure. This fact also indicates that Meg-4 may be deeply involved in the physiology and pathophysiology of renal mesangial cells.
- AAA protein mitochondrial 'meta-mouth proteinase (Casari G. et al. Cell, Vol. 93, 973-983, 1998) has been reported in humans, but it is homologous to Meg-1 4 except for the AAA protein motif. There is almost no sex.
- FtsH Surfactos and Almeida, J. Bacteriol. 124, 1502-1507, 1975
- prokaryotic cells E. coli
- YMEKThorsness PE Mol. Isolated from yeast (S. cerevisiae). Cell Biol. 5418-5426, 1993
- Meg-14 can also be said to be one of the homologs of these proteins in humans.
- no homologous sequence other than the AAA motif can be found in the amino acid sequence of any protein.
- Samples for Northern plots of human primary cultures and tissues Northern blots of human cancer cell lines were purchased from Clontech (Palo Alto, CA).
- Primary culture cells include mesangial cells, human skin epithelial cells, and human renal cortical epithelial cells.
- Samples were 2 zg poly (A) + RNA derived from primary cells of vesicles, human umbilical vein endothelial cells, and human smooth muscle cells.
- Northern plots of human cancer cell lines include promyelocytic leukemia HL-60, HeLa cell S3, chronic myelogenous leukemia K-562, lymphoblastic leukemia MOLT-4, Burkitt lymphoma Raj i, colon adenocarcinoma SW480, lung cancer A549 and 2 ⁇ g of poly (A) + RNA derived from melanoma G361 were used as samples.
- Tissue Northern blots were 2 / g poly (A) NA from heart, brain, placenta, lung, liver, skeletal muscle, kidney, and ⁇ . Hybridization and washing were performed as described above. The results are shown in Table 1-3.
- Example 6 it was pointed out that the Meg-14 protein of the present invention may be a homologue in humans of Escherichia coli FtsH and yeast YME1L reported as one of AAA proteins.
- the amino acid sequence (AF070656) reported as human FtsH after filing the application of this application started from Met at position 225 of Meg-14.
- the translation frame was shifted at the 3 'end.
- sse-PV-lnlr corresponding to positions 55-58 of the amino acid sequence of mouse FtsH, which was also reported after filing the application of the present application
- Meg-4 of the present invention insertion and substitution of 59 amino acid -(Replacement with 59aa)-lnlr was found. Based on this information, we attempted to isolate the phenotype of Meg-14 in humans.
- cDNA was amplified by PCR using the following primer set.
- This primer set has the amino acid sequence of Meg-14 (SEQ ID NO: 2). It is designed to amplify the nucleotide sequence encoding positions 56 to 116 in the above.
- SEQ ID NO: 8 (Meg-1 4 phenotype) sse-PS-lnlr
- Example 9 Production of polyclonal antibody against synthetic peptide of Meg-4 Polyclonal antibody against Meg-4 utilizing a region having low homology to other AAA families and having hydrophilicity as an immunogen was manufactured. Fix a cysteine-containing peptide at the N-terminal or C-terminal of a peptide consisting of the following amino acid sequences: It was synthesized by the phase peptide method.
- Each synthetic peptide was admixed well with an adjuvant (manufactured by Difco), emulsified, and administered subcutaneously to Egret.
- an adjuvant manufactured by Difco
- emulsified emulsified
- subcutaneously e.g., a second immunization (50 / g / fowl) was performed, and thereafter, immunization was performed four times every two weeks (50, 100, 200 / g) / Feather).
- the adjuvant was Freund's complete adjuvant for the first time only, and incomplete Freund's adjuvant for the second and subsequent times.
- the antibody titer of the serum was evaluated by enzyme immunoassay (ELISA) in order to confirm that the serum obtained by blood collection reacted with the synthesized peptide.
- the primary reaction was performed by adding 100 ⁇ L of antiserum serially diluted to a 96-well plate on which 50 ng / well of the antigen was immobilized to each well, followed by washing, followed by HRP binding as a secondary reaction. Giant anti-Egret IgG (Kappel product) was reacted. After washing, orthophenylenediamine (manufactured by Wako Pure Chemical Industries, Ltd.) was added as a substrate to develop a color, and the absorbance was measured at 492 nm to confirm that the antibody titer had increased.
- ELISA enzyme immunoassay
- Example 10 Purification Method of Polyclonal Antibody against Synthetic Peptide of Meg-4
- Polyclonal antibody against the synthetic peptide of Meg-4 was prepared by a known method (Cell Science Separate Volume, Experimental Protocol Series, Anti-peptide Experimental Protocol, Purified by affinity chromatography according to Shujunsha. The operation is as follows.
- MBP-Meg-4 was prepared as follows. That is, the coding region was first amplified by PCR based on the base sequence of the megsin gene shown in SEQ ID NO: 1.
- This amplification product was incorporated into a maltose-binding protein fusion protein expression vector, pMAL-c (New England Biolab), to obtain a vector expressing a fusion protein of MBP and megsin protein. Escherichia coli was transformed with this vector, and the cell disruption solution was designated as MBP-Meg-14.
- PVDF polyvinylidene difluoride
- Example 12 Analysis of chromosome localization of Meg-14 gene by FISH method
- DNA of clone F960 was labeled with digoxigenin dUTP by the nick translation method.
- the clone F960 is a positive clone obtained by screening a Bac (bacterial artifical chromosome) library of the human genome with a Meg-14 specific probe.
- the Meg_4 specific probe used for screening the Bac library was a fragment corresponding to the kpn-I / Sea I digested fragment of the ZIPLoxcDNA clone containing the 5, -region (0-644 nt) of the cDNA as an insert.
- the labeled probe was treated with the cut human DNA and then hybridized to normal metaphase human chromosomes.
- Human chromosomes were obtained by treating PHA-stimulated peripheral blood lymphocytes with a solution containing 50% formamide, 10% dextran sulfate, and 2 ⁇ SSC.
- the hybridization signal was detected by reacting a fluorescein-conjugated anti-digoxigenin antibody after counterstaining with DAPI.
- a DNA which is frequently expressed in mesangial cells a protein encoded by the DNA, an antibody which binds to the protein, and the like are provided. These are presumed to be deeply involved in the bioactivity specific to mesangial cells, and are useful for identifying mesangial cells, detecting abnormalities in mesangial cells, and the like. Furthermore, the function of the protein will reveal the function of the mesangial cells, and it is expected that the function of the proteins will be used to determine the cause of diseases associated with the mesangial cells. It is also expected to be applied to the treatment and diagnosis of diseases related to mesangial cells.
- the onset and progress of glomerulonephritis may be controlled by artificial regulation of Meg-14.
- quantification of Meg-14 protein and mRNA in mesangial cells and body fluids can be expected to make it possible to diagnose renal diseases such as glomerulonephritis.
- Renionephritis dysfunction of the mesangial region is observed, resulting in increased proliferation of mesangial cells or increased production of matrix substrates from the cells. It is quite possible that Meg-4 is involved in these conditions.
- the meg-4 according to the present invention has features in common with megsin previously reported by the present inventor in that it is highly expressed in mesangial cells.
- Meg14 according to the present invention is considered to belong to the ATP-MP group in the AAA protein family.
- megsin is a protein with homology to the proteazyme SERPIN superamylase.
- the fact that expression of meg-14 according to the present invention is observed in a relatively wide range of tissues is different from the feature that megsin is specifically expressed in mesangial cells. Therefore, Meg-4 according to the present invention has the potential to be an important protein that supports the function of mesangial cells. The significance of the present invention elucidating the existence of such important proteins is great.
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CA002359039A CA2359039A1 (en) | 1999-01-29 | 2000-01-27 | Meg-4 protein |
AU23197/00A AU773638B2 (en) | 1999-01-29 | 2000-01-27 | MEG-4 protein |
EP20000901931 EP1146053A4 (en) | 1999-01-29 | 2000-01-27 | PROTEIN MEG-4 |
KR1020017009454A KR20010102996A (ko) | 1999-01-29 | 2000-01-27 | 메그-4 단백질 |
US09/889,914 US6680370B1 (en) | 1999-01-29 | 2000-01-27 | Meg-4 protein |
NO20013699A NO20013699L (no) | 1999-01-29 | 2001-07-27 | Meg-4-protein |
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US09/889,914 A-371-Of-International US6680370B1 (en) | 1999-01-29 | 2000-01-27 | Meg-4 protein |
US10/756,882 Division US20040137495A1 (en) | 1999-01-29 | 2004-01-13 | Meg-4 protein |
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ES2948896T3 (es) * | 2012-03-29 | 2023-09-21 | Becton Dickinson Co | Acidos nucleicos para la amplificación de ácidos nucleicos |
US9920381B2 (en) | 2014-12-02 | 2018-03-20 | Roche Molecular Systems, Inc. | Compositions and methods for detecting MECC-containing methicillin-resistant Staphylococcus aureus |
Citations (3)
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---|---|---|---|---|
WO1998022501A2 (en) * | 1996-11-20 | 1998-05-28 | Genetics Institute, Inc. | Secreted proteins and polynucleotides encoding them |
WO1998045436A2 (en) * | 1997-04-10 | 1998-10-15 | Genetics Institute, Inc. | SECRETED EXPRESSED SEQUENCE TAGS (sESTs) |
WO1998056804A1 (en) * | 1997-06-13 | 1998-12-17 | Human Genome Sciences, Inc. | 86 human secreted proteins |
-
2000
- 2000-01-27 WO PCT/JP2000/000413 patent/WO2000044783A1/ja not_active Application Discontinuation
- 2000-01-27 AU AU23197/00A patent/AU773638B2/en not_active Ceased
- 2000-01-27 EP EP20000901931 patent/EP1146053A4/en not_active Withdrawn
- 2000-01-27 US US09/889,914 patent/US6680370B1/en not_active Expired - Fee Related
- 2000-01-27 CA CA002359039A patent/CA2359039A1/en not_active Abandoned
- 2000-01-27 CN CN00805486A patent/CN1354756A/zh active Pending
- 2000-01-27 KR KR1020017009454A patent/KR20010102996A/ko not_active Application Discontinuation
-
2001
- 2001-07-27 NO NO20013699A patent/NO20013699L/no not_active Application Discontinuation
-
2004
- 2004-01-13 US US10/756,882 patent/US20040137495A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998022501A2 (en) * | 1996-11-20 | 1998-05-28 | Genetics Institute, Inc. | Secreted proteins and polynucleotides encoding them |
WO1998045436A2 (en) * | 1997-04-10 | 1998-10-15 | Genetics Institute, Inc. | SECRETED EXPRESSED SEQUENCE TAGS (sESTs) |
WO1998056804A1 (en) * | 1997-06-13 | 1998-12-17 | Human Genome Sciences, Inc. | 86 human secreted proteins |
Non-Patent Citations (2)
Title |
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MIYATA T. ET AL.,: "A Mesangium-predominant Gene, Megsin, Is a New Serpin Upregulated in IgA Nephropathy", J. CLIN. INVEST.,, vol. 102, no. 4, 1998, pages 828 - 836, XP002926464 * |
See also references of EP1146053A4 * |
Also Published As
Publication number | Publication date |
---|---|
AU773638B2 (en) | 2004-05-27 |
NO20013699D0 (no) | 2001-07-27 |
EP1146053A4 (en) | 2002-10-25 |
CN1354756A (zh) | 2002-06-19 |
NO20013699L (no) | 2001-09-26 |
US20040137495A1 (en) | 2004-07-15 |
AU2319700A (en) | 2000-08-18 |
CA2359039A1 (en) | 2000-08-03 |
KR20010102996A (ko) | 2001-11-17 |
US6680370B1 (en) | 2004-01-20 |
EP1146053A1 (en) | 2001-10-17 |
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