WO2006123644A1 - 低酸素ストレス応答に関与するInt6タンパク質、およびその利用 - Google Patents
低酸素ストレス応答に関与するInt6タンパク質、およびその利用 Download PDFInfo
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- WO2006123644A1 WO2006123644A1 PCT/JP2006/309720 JP2006309720W WO2006123644A1 WO 2006123644 A1 WO2006123644 A1 WO 2006123644A1 JP 2006309720 W JP2006309720 W JP 2006309720W WO 2006123644 A1 WO2006123644 A1 WO 2006123644A1
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- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
- C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
- C07K14/4702—Regulators; Modulating activity
- C07K14/4705—Regulators; Modulating activity stimulating, promoting or activating activity
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6893—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids related to diseases not provided for elsewhere
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- 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
- A01K2267/00—Animals characterised by purpose
- A01K2267/03—Animal model, e.g. for test or diseases
- A01K2267/035—Animal model for multifactorial diseases
- A01K2267/0375—Animal model for cardiovascular diseases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2500/00—Screening for compounds of potential therapeutic value
Definitions
- the present invention relates to an Int6 protein that controls hypoxic stress response, a vascular disease therapeutic agent or anticancer agent containing a substance that controls the expression or function of the protein, and a screening method for the agent.
- oxygen deficiency is an important issue related to the survival of life.
- Possible causes of hypoxia in an organism include anemia, abnormal cardiopulmonary function, and highland life.
- each cell in the body tries to adapt to hypoxic stress by changing the expression pattern of various genes. For example, activation of glycolysis and induction of angiogenesis occur as a response to cellular hypoxic stress.
- HRE hypoxic stress response elements
- Transcription factor HIF hyperoxia-inducible factor; hypoxia-responsive factor
- HIF has been analyzed in detail, creating VEGF (vascular endothelial growth factor), which is essential for tumor angiogenesis, and transcription of many glycolytic enzymes involved in mitochondrial energy metabolism. It is known to perform control.
- VEGF vascular endothelial growth factor
- HIF plays a variety of roles in the cell, such as energy metabolism, erythrocyte proliferation, iron metabolism, cell proliferation, cell death, and dopamine.
- HIF1 hypoxia inducible factor 1
- HLF HLF1 like factor
- GATA-2 GATA-2
- pVHL binds to HIF1a, and HIF1a is degraded by ubiquitination.
- PHD proline hydroxylase
- HIF is broadly divided into three types: HIF1 a, HIF2 a, and HIF3 a.
- HIF2 a is expressed in vascular endothelial cells, skeletal muscle, myocardium, etc.
- ischemic diseases such as cerebral infarction or myocardial infarction (see Non-Patent Documents 1 to 4).
- HIF2a is involved in cancer angiogenesis among diseases associated with hypoxic stress (see Non-Patent Document 5).
- HIF2 ct several factors that bind to it have been reported, but the factors that control its function have been clarified.
- Patent ⁇ ! 3 ⁇ 4U Semenza GL. ⁇ , “HI _l and mechanisms of hypoxia sensing.”, Curr Opin Cell BioL, 2001 Apr, Vol.13 (2), p.167-71.
- Non-Patent Document 2 Giaccia A, 2 other authors, "HIF_1 as a target for drug development.”, 2003 Oct, 2 (10), p.803-11.
- Non-Patent Document 3 Jelkmann W., "Effects of erythropoietin on brain function.”, Curr P harm Biotechnol., 2005 Feb, Vol. 6 (l), p.65- 79
- Non-Patent Document 4 Marti HH., “Erythropoietin and the hypoxic brain.”, J Exp Biol., 2004, Aug., Vol. 207 (Pt 18), p.3233—42.
- Non-Special Terms 5 Favier J, 3 others, ⁇ Coexpression of endothelial PAS protein 1 with e ssential angiogenic factors suggests its involvement in human vascular development. '', Dev Dyn., 2001 Nov, VoL222 (3), p.377-88
- the present invention has been made in view of these circumstances, and aims to elucidate the mechanism of gene expression response during hypoxic stress related to angiogenesis.
- the purpose is to identify factors that control the function of HIF2a that promotes the oxygen stress response. More specifically, a drug for controlling a hypoxic stress response, a drug having a therapeutic effect on a vascular disease, and a means for solving the problems to be provided as a screening method for the drug
- the present inventors have intensively studied to solve the above-mentioned problems, and as a result, as a factor involved in the hypoxic stress response that promotes angiogenesis, Int6 having binding activity with HIF2a is newly added. Successfully identified.
- Substances that inhibit Int6 gene expression or Int6 function enhance the angiogenic effect by enhancing the transcriptional action of HIF2a on hypoxic stress response gene It is expected.
- the substance is expected to have a high angiogenic effect, and is expected to have a therapeutic effect on various vascular diseases such as obstructive arteriosclerosis, restenosis after percutaneous vasodilatation (PCT), myocardial infarction and the like.
- PCT percutaneous vasodilatation
- the present inventors produced an experimental animal in which the expression of Int6 gene was suppressed by siRNA, and found that the angiogenic effect was actually increased in the experimental animal. Therefore, a substance that inhibits the expression or function of Int6 has been successfully confirmed at the level of animal experiments to actually effectively increase the angiogenic effect.
- siRNA which is expected to suppress the expression of the Int6 gene specifically, mimics the expression of transcription regulators. It is highly expected to become a completely new therapeutic agent for vascular diseases that enhances the expression of genes that have therapeutic effects on vascular diseases.
- a substance that enhances the expression or function of Int6 is expected to suppress the angiogenic effect by decreasing the hypoxic stress response gene transcription promoting action of HIF2a. Since the angiogenic effect is increased in cancer tissues, the substance is considered to be a new anticancer agent whose mechanism is to suppress angiogenesis.
- female hormones enhance the hypoxic stress response gene transcription promoting action of HIF2a by suppressing the expression of Int6 gene, thereby promoting angiogenesis. Therefore, female hormones are effective in the treatment of diseases (such as obstructive arteriosclerosis) that can improve the disease state by improving blood volume, for example.
- diseases such as obstructive arteriosclerosis
- female hormone inhibitors are expected to have, for example, an anticancer effect by inhibiting angiogenesis.
- the present invention relates to a drug that controls a hypoxic stress response, a drug that has a therapeutic effect on vascular disease or cancer, and a screening method for the drug.
- Int6 protein function inhibitor is selected from the group consisting of the following (a) to (c) The hypoxic stress response promoter according to [1], which is a compound,
- hypoxic stress response promoter according to any one of [1] to [4], wherein the hypoxic stress response promotion is induction of angiogenesis
- a hypoxic stress response inhibitor comprising an Int6 protein expression enhancing substance or a function enhancing substance as an active ingredient
- hypoxic stress response inhibitor according to [7], wherein the hypoxic stress response suppression is suppression of angiogenesis
- a therapeutic agent for vascular disease comprising the hypoxic stress response promoter according to any one of [1] to [5] as an active ingredient,
- the therapeutic agent for vascular disease according to [9], wherein the vascular disease is ischemic brain or heart disease, neurodegenerative disease, traumatic brain disorder, or liver, knee, muscle, or skin disease, 1 1]
- An angiogenesis-related disease therapeutic agent for example, an anticancer agent
- a screening method for a therapeutic agent for vascular diseases comprising selecting a compound that decreases the expression level of Int6 gene or the activity of Int6 protein,
- a screening method for a therapeutic agent for vascular disease comprising the following steps (a) to (c):
- a screening method for a therapeutic agent for vascular disease comprising the following steps (a) to (c):
- (c) a step of selecting a compound that reduces the expression level as compared to the case where measurement is performed in the absence of the test compound.
- a screening method for a therapeutic agent for vascular diseases comprising the following steps (a) to (c):
- (c) a step of selecting a compound that reduces the activity of the protein as compared to the case where it is measured in the absence of the test compound.
- a screening method for a therapeutic agent for vascular disease comprising selecting a compound that suppresses the binding activity between Int6 protein and HIF2 ⁇ protein,
- a screening method for a therapeutic agent for vascular disease comprising the following steps (a) to (c):
- (c) a step of selecting a compound that reduces the binding activity as compared with the case where it is measured in the absence of the test compound.
- a screening method for an angiogenesis-related disease therapeutic drug comprising the following steps (a) to (c):
- a screening method for an angiogenesis-related disease therapeutic drug comprising the following steps (a) to (c):
- (c) a step of selecting a compound that increases the expression level as compared with the case where it is measured in the absence of the test compound.
- a screening method for an angiogenesis-related disease therapeutic drug comprising the following steps (a) to (c):
- (c) a step of selecting a compound that increases the activity of the protein as compared to the measurement in the absence of the test compound.
- a screening method for a therapeutic agent for angiogenesis-related diseases comprising selecting a compound that enhances the binding activity between Int6 protein and HIF2 ⁇ protein,
- a screening method for an angiogenesis-related disease therapeutic drug comprising the following steps (a) to (c):
- (c) a step of selecting a compound that increases the binding activity as compared to the measurement in the absence of the test compound.
- a screening method for an angiogenesis-related disease therapeutic drug comprising the following steps (a) to (c):
- the present invention provides the following.
- An angiogenesis inducer comprising a dominant negative mutant of Int6 as an active ingredient.
- An angiogenesis inhibitor comprising an Int6 protein or a vector expressing Int6 protein as an active ingredient. (Preferably, an angiogenesis inhibitor in cancer cells)
- An angiogenesis inhibitor in cancer cells [32] A carrier cell characterized in that expression of Int6 gene is suppressed and angiogenesis is induced.
- a therapeutic agent for vascular diseases comprising the angiogenesis inhibitor according to [31] or the carrier cell according to [32] or [33] as an active ingredient.
- a method for producing a therapeutic agent for vascular diseases comprising a step of introducing siRNA for the Int6 gene into an isolated carrier cell.
- a method for treating a vascular disease comprising a step of administering an effective amount of the following (a) to (c): (a) Hypoxic stress response promoter of the present invention
- a method for treating a vascular disease comprising the following steps (a) and (b):
- FIG. 1 is a diagram showing the structure of a siRNA expression vector that suppresses Int6 gene expression (layout 1J).
- FIG. 2 is a graph showing the effect of suppressing transcriptional activity of HIF2a by Int6.
- FIG. 3 is a diagram and a photograph showing the effect of suppressing the expression of endogenous Int6 gene by Int6 siRNA.
- FIG. 4 is a photograph showing the anti-angiogenic effect of Int6 by siRNA.
- FIG. 5 shows cells treated with estradione monole (E2), progesteron (Progestin), or estrogen receptor inhibitor tamoxifen (40H-TAM) and cultured for 24 hours.
- E2 estradione monole
- Progestin progesteron
- 40H-TAM estrogen receptor inhibitor tamoxifen
- FIG. 6 is a diagram showing a mechanism of HIF regulation by ubiquitin and factors induced by transcriptional activity.
- FIG. 7 summarizes the matters relating to the novel HIF2a binding factor identified by the yeast Two Hybrid method.
- FIG. 8 is a diagram showing the relationship between Int6 mutation by MMTV and HIF2a.
- FIG. 9 shows that siRNA treatment secretes angiogenic factors by introducing synthetic Int6-siRNA.
- FIG. 3 is a diagram showing a basic concept of a neovascular bypass treatment method by autotransplantation using “angiogenesis-inducing cells”.
- FIG. 10 is a conceptual diagram of neovascular bypass therapy using siRNA-treated angiogenesis-inducing cells.
- FIG. 11 is a diagram showing the binding characteristics of Int6 to HIF2.
- FIG. 12 is a diagram showing a HIF2 binding site of Int6.
- Fig. 13 shows transcription of HIFla, HIF2a, and HI F3a of Int6 wild-type and constitutively inactivated (dominant negative) mutant Int6 AC in normoxia or hypoxia It is a graph which shows activity.
- FIG. 14 is a photograph showing the result of remarkable angiogenesis induction in the subcutaneous mouse using an Int6-siRNA expression vector.
- FIG. 15 is a graph showing the results of quantitative analysis of angiogenesis by Int6-siRNA.
- the left graph shows neovascular area (AREA), and the right graph shows neovascular length (LENGTH).
- FIG. 16 is a photograph showing a histopathological image of a blood vessel born by Int6-siRNA. Arrows in the picture indicate newly born blood vessels.
- a substance that suppresses (inhibits) the expression or function (activity) of Int6 has a function of promoting a hypoxic stress response by enhancing the function of a HIF2 transcriptional regulatory factor. It was issued.
- the present invention provides a hypoxic stress response promoter containing a substance that suppresses the expression of Int6 protein or a substance that suppresses function as an active ingredient.
- the Int6 gene of the present invention is known to exist in various organisms including humans.
- the Int6 gene is known to be the same gene as eIF3e / p48, which is one of the components of the translation regulatory factor Translation Initiation Factor, and is equivalent to the Int6 gene in humans, mice, rats, and force L A gene (homologous gene, homolog) has been identified.
- the Int6 protein of the present invention is preferably a Hnt6 protein.
- human Hnt6 protein such as mammals such as orangutans, chimpanzees, dogs, mice, and rats (rats), birds such as chickens, and African animals. Even homologues in amphibians such as mega frogs.
- GenBank has an accession number of NM_0 01568. The names of gene databases related to Int6 homologues in the above non-human species and the accession numbers in the gene database are shown below.
- Orangutan emb: CR860517.1
- Inu ref: XM_532304.1
- Rat gb: BC082087.1
- Mouse ref : NM—008388.1
- chimpanzee ref: XM—519906.1
- chicken emb: AJ719829.11, ref: NM_001006349.1
- African frog gb: AF162775.1, AF162775
- the nucleotide sequence of a gene encoding Int6 in human is shown in SEQ ID NO: 1.
- the amino acid sequence of the protein encoded by the base sequence is shown in SEQ ID NO: 2.
- Even proteins other than those described above exhibit high homology (usually 70% or more, preferably 80% or more, more preferably 90% or more, most preferably 95% or more) with the sequences described in the sequence listing of the present application.
- a protein having a function possessed by Int6 (for example, a function of binding to HIF2a protein) is included in Int6 of the present invention.
- the protein is a protein comprising an amino acid sequence in which one or more amino acids are appended, deleted, substituted, or inserted in the amino acid sequence set forth in SEQ ID NO: 2, for example, and the number of normally changing amino acids is 30 amino acids Within 10 amino acids, preferably within 10 amino acids, more preferably within 5 amino acids, most preferably within 3 amino acids.
- the "Int6 protein" of the present invention can be prepared not only as a natural protein but also as a recombinant protein using a gene recombination technique. Natural proteins can be prepared by, for example, using affinity chromatography using antibodies against Int6 protein against cell (tissue) extracts that are thought to express Int6 protein. It is. On the other hand, the recombinant protein can be prepared by culturing cells transformed with DNA encoding Int6 protein.
- hypoxic stress responsive agent is more specifically a gene that responds due to hypoxic stress (referred to as “hypoxic stress responsive gene” in the present specification). It can be said that it is a drug having a function of increasing the expression of (in some cases). More specifically, the hypoxic stress response gene in the present invention is a gene whose transcription is controlled by HIF2 and is usually a gene involved in induction of angiogenesis. There are usually multiple hypoxic stress response genes in various organisms.
- the hypoxic stress response gene of the present invention includes, for example, human VEGF (Vascular endothelial growth factor) ⁇ erythropoietin, IGF, insulin growth factor-1
- human VEGF Vascular endothelial growth factor
- IGF erythropoietin
- IGF insulin growth factor-1
- examples thereof include a gene encoding a glucose transporter carbonic anhydrase IX, a transforming growth factor.
- the substance that suppresses the expression or function of Int6 of the present invention has a function of enhancing the expression of the above-mentioned gene, for example.
- ischemia in which blood flow is generally decreased is accompanied by improvement in blood volume by angiogenesis.
- diseases that can improve the pathological condition For example, a vascular disease etc. are mentioned.
- obstructive arteriosclerosis restenosis after percutaneous vasodilation, myocardial infarction, cerebral infarction or ischemic brain disease such as cerebral hemorrhage, Alzheimer's disease or Parkinson's disease, or spinocerebellar degeneration
- Neurodegenerative diseases such as infectious diseases, neurological diseases including traumatic brain disorders such as spinal cord injury or brain contusion, liver diseases such as cirrhosis, and atrophic muscle disease.
- the Int6 protein expression-suppressing substance includes, for example, a substance that inhibits Int6 transcription or translation from the transcription product.
- Preferred examples and embodiments of the expression-suppressing substance of the present invention include a compound (nucleic acid) selected from the group consisting of the following (a) to (c).
- Nucleic acid in the present invention means RNA or DNA. Chemically synthesized nucleic acid analogs such as so-called PNA (p-marked tide nucleic acid) are also included in the nucleic acids of the present invention. PNA is a nucleic acid The basic skeletal structure pentose / phosphate skeleton is replaced with a polyamide skeleton with glycine units, and it has a three-dimensional structure very similar to nucleic acid.
- the nucleic acid of the present invention also includes so-called LNA (Locked Nucleic Acid).
- antisense nucleic acids inhibit the expression of target genes by inhibiting various processes such as transcription, splicing or translation (Hirashima and Inoue, Shinsei Kagaku Kogaku Kenkyu 2 Nucleic acid IV gene replication and expression, Japan (Biochemical Society, Tokyo Chemical Doujin, 1993, 319-347.)
- the antisense nucleic acid used in the present invention may inhibit the expression of the Int6 gene by any of the actions described above. In one embodiment, it is considered effective to inhibit gene translation if an antisense probe complementary to the non-translation region near the 5 ′ end of the Int6 gene mRNA is designed. In addition, it is possible to use a cage complementary to the coding region or the 3 ′ untranslated region. Thus, the nucleic acid containing the antisense sequence of the sequence of the untranslated region as well as the translated region of the Int6 gene is also included in the antisense nucleic acid used in the present invention.
- the antisense nucleic acid to be used is linked downstream of a suitable promoter, and preferably a sequence containing a transcription termination signal is linked on the 3 ′ side.
- the nucleic acid thus prepared can be transformed into a desired animal by using a known method.
- Sequence of antisense nucleic acid Is preferably a sequence complementary to the endogenous Int6 gene or a part thereof possessed by the animal to be transformed, but may not be completely complementary as long as the gene expression can be effectively suppressed.
- the transcribed RNA preferably has a complementarity of 90% or more, most preferably 95% or more, to the transcript of the target gene.
- the length of the antisense nucleic acid is preferably at least 15 bases and less than 25 bases. Is not necessarily limited to this length, and may be, for example, 100 bases or more, or 500 bases or more.
- the antisense of the present invention is not particularly limited, but can be prepared, for example, based on the base sequence of the Int6 gene obtained with GenBank accession number NM001568.
- Ribozyme refers to an RNA molecule having catalytic activity. Some ribozymes have various activities, but research focused on ribozymes as enzymes that cleave RNA has made it possible to design ribozymes that cleave RNA in a site-specific manner. Some ribozymes have a size of 400 nucleotides or more, such as group I introns and Ml RNA contained in RNase P. Some have a 40-nucleotide active domain called hammerhead or hepin. (Makoto Koizumi and Eiko Otsuka, Protein Nucleic Acid Enzyme, 1990, 35, 2191.).
- the self-cleaving domain of the hammerhead ribozyme has the ability to cleave 3 'of C15 in the sequence G13U14C15.
- base pairing between U14 and A9 is important. It has been shown that A15 or U15 can also be cleaved instead of (Koizumi, Tsuji et al., FEBS Lett, 1988, 228, 228.).
- Hairpin ribozymes are also useful for the purposes of the present invention.
- This ribozyme is an example For example, it is found in the minus strand of the satellite RNA of tobacco ring spot virus (Buzayan, JM., Nature, 1986, 323, 349.). It has been shown that hairpin ribozyme can also generate target-specific RNA cleavage ribozymes (Kikuchi, Y. & Sasaki, Tsuji, Nucl Acids Res, 1991, 19, 6751., Hiroshi Kikuchi, Chemistry and Biology, 1992, 30, 112.). Thus, the expression of the gene can be inhibited by specifically cleaving the transcript of the Int6 gene in the present invention using a ribozyme.
- RNA interference (hereinafter abbreviated as “R NAij”) has attracted attention as a technique that can suppress gene expression more effectively.
- RNAi is a short double-stranded RNA consisting of a sense RNA composed of a sequence homologous to the mRNA of the target gene and an antisense RNA composed of a complementary sequence (hereinafter abbreviated as “dsRNA”). Is a phenomenon that can induce the destruction of the target gene mRNA and suppress the expression of the target gene.
- RNAi can suppress the expression of target genes in this way, it can be used as a simple gene knockout method instead of the conventional complicated and low efficiency homologous recombination method or applied to gene therapy. It attracts attention as a possible method.
- the RNA used for RNAi is not necessarily completely identical to the Int6 gene or a partial region of the gene, but preferably has complete homology.
- RNAiRNA double-stranded RNA
- siRNA capable of sense RNA and anti-sense RNA against the partial sequence of the base sequence described in SEQ ID NO: 1.
- the power of DICER comes into contact with double-stranded RNA, and the double-stranded RNA is small iterfering RNA or It is thought to be broken down into small fragments called siRNAs.
- the double-stranded RNA having the RNAi effect in the present invention includes double-stranded RNA before being digested by DICER as described above. That is, there is no RNAi effect in the length as it is Since such a long RNA is expected to be degraded into siRNA having an RNAi effect in cells, the length of the double-stranded RNA in the present invention is not particularly limited.
- RNA corresponding to the full length or almost full length region of the mRNA of the Int6 gene of the present invention is decomposed in advance with, for example, DICER, and the degradation product is used as the drug of the present invention.
- This degradation product is expected to contain double-stranded RNA molecules (siRNA) having the RNAi effect.
- siRNA double-stranded RNA molecules
- it is not necessary to particularly select a region on mRNA that is expected to have an RNAi effect. That is, the region on the mRNA of the Int6 gene of the present invention having an RNAi effect does not necessarily have to be accurately defined.
- RNA molecules having one end closed in the above RNA molecule for example, siRNA (shRNA) having a hairpin structure is also included in the present invention. That is, a single-stranded RNA molecule that can form a double-stranded RNA structure in the molecule is also included in the present invention.
- shRNA siRNA
- double-stranded RNA that can be suppressed by the RNAi effect is appropriately prepared by those skilled in the art based on the base sequence of the Int6 gene of the present invention that is the target of the double-stranded RNA. That's the power S.
- the double-stranded RNA of the present invention can be prepared based on the base sequence shown in SEQ ID NO: 1.
- DNA (vector) capable of expressing the RNA of the present invention is also included in a preferred embodiment of the compound capable of suppressing the expression of the Int6 gene of the present invention.
- the DNA (vector) capable of expressing the double-stranded RNA of the present invention has a DNA that encodes one strand of the double-stranded RNA and a DNA force that encodes the other strand of the double-stranded RNA. So that each can express DNA with a structure linked to a promoter.
- the above DNA of the present invention can be appropriately prepared by those skilled in the art using general genetic engineering techniques. More specifically, the expression vector of the present invention can be prepared by appropriately inserting a DNA encoding the RNA of the present invention into various known expression vectors.
- the expression-suppressing substance of the present invention includes, for example, a compound that suppresses Int6 expression by binding to an Int6 expression regulatory region (for example, a promoter region).
- the compound can be obtained, for example, by a screening method using an Int6 promoter DNA fragment and the binding activity with the DNA fragment as an index.
- those skilled in the art can appropriately determine whether or not the expression of Int6 of the present invention is suppressed for a desired compound by a known method such as a reporter assay method.
- a DNA (vector) capable of expressing the RNA of the present invention is also included in a preferred embodiment of the compound capable of suppressing the expression of the Int6 gene of the present invention.
- the DNA (vector) capable of expressing the double-stranded RNA of the present invention has a DNA that encodes one strand of the double-stranded RNA and a DNA force that encodes the other strand of the double-stranded RNA.
- Each DNA has a structure linked to a promoter so that it can be expressed.
- the above DNA of the present invention can be appropriately prepared by those skilled in the art using general genetic engineering techniques. More specifically, the expression vector of the present invention can be prepared by appropriately inserting DNA encoding the RNA of the present invention into various known expression vectors.
- a preferred embodiment of the vector of the present invention includes a vector that expresses siRNA that suppresses Int6 expression.
- the base sequence of the region expressing siRNA in the vector can include the sequence shown in FIG. 1 (SEQ ID NOs: 5 to 7), but is not particularly limited thereto.
- siRNA of the present invention an siRNA having a structure in which the sequences of the regions described as sense oligo and antisense oligo in each base sequence shown in Fig. 1 are hybridized is preferably used. Can show.
- the expression-suppressing substance of the present invention includes, for example, a compound that suppresses Int6 expression by binding to an Int6 expression regulatory region (for example, a promoter region).
- an Int6 expression regulatory region for example, a promoter region
- the compound uses an Int6 promoter DNA fragment and exhibits binding activity to the DNA fragment. It can be obtained by a screening method used as an index.
- those skilled in the art can appropriately determine whether or not the expression of Int6 of the present invention is suppressed for a desired compound by a known method such as a reporter assay method.
- the present invention also provides a hypoxic stress response promoter containing an Int6 protein function inhibitor as an active ingredient. Since Int6 protein binds to HIF2a and has the function of suppressing the function of HIF2a, suppressing the function of Int6 protein activates the function of HIF2 and transcribes the transcription function of the hypoxic stress response gene. Be enhanced. Therefore, a substance that suppresses the function of Int6 protein is considered to be effective as a hypoxic stress response promoter.
- Examples of the function inhibitor of Int6 protein in the present invention include the following compounds (a) to (c).
- Antibodies that bind to Int6 protein can be prepared by methods known to those skilled in the art.
- a polyclonal antibody can be obtained, for example, as follows. Serum is obtained by immunizing small animals such as rabbits with recombinant (recombinant) Int6 protein expressed in microorganisms such as Escherichia coli as a fusion protein with natural Int6 protein or GST. This is prepared by, for example, purification using ammonium sulfate precipitation, protein A, protein G column, DEAE ion exchange chromatography, affinity column coupled with Int6 protein or synthetic peptide, or the like.
- a monoclonal antibody for example, a small animal such as a mouse is immunized with the Int6 protein or a partial peptide thereof, the spleen is removed from the mouse, and this is ground to separate the cells.
- a myeloma cell is fused with a reagent such as polyethylene glycol, and a clone that produces an antibody that binds to the Int6 protein is selected from the resulting fused cell (neubridoma).
- the obtained hybridoma was transplanted into the abdominal cavity of the mouse, and ascites was collected from the mouse, and the resulting monoclonal antibody was purified by, for example, ammonium sulfate precipitation, protein A, protein G column, DEAE ion exchange gel. It can be prepared by purification with a mouth column, affinity column coupled with Int6 protein or synthetic peptide.
- the antibody of the present invention is not particularly limited as long as it binds to the Int6 protein of the present invention.
- a human antibody, a humanized antibody by genetic recombination, and an antibody fragment or antibody thereof Modified products are also included.
- the Int6 protein of the present invention used as a sensitizing antigen for obtaining an antibody is not limited to the animal species from which it is derived, but is preferably a protein derived from a mammal such as a mouse or a human. Derived proteins are preferred. Those skilled in the art can appropriately obtain human-derived proteins using the gene sequences or amino acid sequences disclosed in the present specification.
- the protein used as the sensitizing antigen may be a complete protein or a partial peptide of the protein.
- the partial peptide of the protein include an amino group (N) terminal fragment and a carboxy (C) terminal fragment of the protein.
- antibody means an antibody that reacts with the full length or fragment of a protein.
- human lymphocytes such as human lymphocytes infected with EB virus are sensitized in vitro with proteins, protein-expressing cells or lysates thereof. And sensitized lymphocytes can be fused with human-derived myeloma cells having permanent mitotic activity, such as U266, to obtain a hyperidoma that produces a desired human antibody having a protein binding activity.
- the antibody against the Int6 protein of the present invention inhibits the function of the Int6 protein by binding to the Int6 protein, and is expected, for example, to treat or improve vascular diseases.
- a human antibody or a human type antibody is preferable in order to reduce immunogenicity.
- the present invention also includes a low molecular weight substance (low molecular weight compound) that binds to Int6 protein as a substance that can inhibit the function of Int6 protein.
- the low molecular weight substance that binds to the Int6 protein of the present invention may be a natural or artificial compound. Usually, it is a compound that can be produced or obtained by using methods known to those skilled in the art. The present invention The compound can also be obtained by the screening method described below.
- Examples of the low molecular weight compound that binds to Int6 protein (b) and suppresses its function include compounds having high affinity for Int6.
- a preferred embodiment of the Int6 function-suppressing substance of the present invention includes a compound that inhibits the binding (interaction) between Int6 and HIF2a. This compound is thought to increase the amount of HIF2a that functions as a transcription factor in a free state by inhibiting the binding to HIF2 human Int6, and as a result, promotes the transcription of hypoxic stress response genes. .
- an Int6 protein mutant having a dominant negative property with respect to the Int6 protein
- “Int6 protein mutant having a dominant negative property with respect to Int6 protein” means a protein having a function of eliminating or reducing the activity of an endogenous wild-type protein by expressing a gene encoding the protein. Point to. More specifically, examples of the Int6 dominant negative protein include proteins that have lost the binding activity to HIF2a.
- Int6 dominant negative protein examples include proteins lacking the C-terminal of Int6 protein ( ⁇ 6- ⁇ .
- Int6_AC is the C-terminal region of Int6 protein.
- Int6 protein mutants lacking the PINT region see Fig. 2.
- hypoxic stress response promoter provided by the present invention has an effect of inducing (promoting) angiogenesis, it is expected to have a therapeutic effect on vascular diseases.
- the present invention provides a vascular disease therapeutic agent (pharmaceutical composition) containing the hypoxic stress response promoter of the present invention as an active ingredient.
- the substance that enhances the expression or function of Int6 of the present invention is expected to have a function of reducing the hypoxic stress response by reducing the function of the HIF2 ⁇ transcriptional regulatory factor.
- a hypoxic stress response inhibitor comprising: The above “enhancement of protein expression” includes enhancement of transcription from a gene and enhancement of translation from the transcription product.
- Examples of the substance include substances that promote the binding (interaction) between Int6 and HIF2a.
- the substance can be appropriately obtained by screening a substance that enhances the binding activity using the binding activity between Int6 protein and HIF2 protein as an index.
- the hypoxic stress response inhibitor provided by the present invention has an effect of inhibiting (inhibiting) angiogenesis, it is useful for diseases associated with angiogenesis (angiogenesis-related diseases) such as cancer. It is expected to have a therapeutic effect on it.
- diseases associated with angiogenesis include breast cancer, colon cancer, oral cancer, pharyngeal / laryngeal cancer, esophageal cancer, stomach cancer, liver cancer, kidney cancer, bladder cancer, uterine cancer and the like.
- diseases that can be expected to have a therapeutic effect by suppressing angiogenesis include diseases in which abnormal blood vessels increase in the retina, such as diabetic retinopathy, and pulmonary hypertension.
- suppression of the function of the HIF2a transcriptional regulatory factor may have an effect on erythrocytosis or abnormal glucose metabolism in diabetes, which not only suppress (inhibit) angiogenesis.
- female hormones suppress the expression of Int6. That is, it is considered that female hormones enhance the hypoxic stress response gene transcription promoting action of HIF2 ⁇ by suppressing the expression of Int6 gene and, as a result, promote angiogenesis. Therefore, female hormones are effective for the treatment of diseases (for example, obstructive arteriosclerosis, etc.) that can improve the pathological condition by improving blood volume, for example.
- diseases for example, obstructive arteriosclerosis, etc.
- female hormones can be preferably shown. More specifically, the female hormone can be exemplified by estrogen, progesterone and the like. In addition to female hormones, examples of substances that enhance the expression or function of Int6 protein include female hormone secretion promoters and female hormone receptor agonists.
- female hormone inhibitors are expected to reduce the hypoxic stress response gene transcription promoting action of HIF2a by enhancing the expression of Int6 gene, and as a result, to reduce angiogenesis. . Therefore, female hormone inhibitors can be used, for example, to suppress angiogenesis. Therefore, it is effective for treatment of diseases (for example, cancer diseases) that can improve the pathological condition.
- diseases for example, cancer diseases
- the present invention relates to a carrier cell characterized in that the expression of the Int6 gene is suppressed and angiogenesis is induced.
- the cells are expected to have a therapeutic effect on vascular diseases.
- the “carrier cell” in the present invention include fibroblasts and glial cells.
- Int6 gene expression can be suppressed using, for example, siRNA against the Int6 gene.
- the present invention provides a therapeutic agent for angiogenesis-related diseases (eg, anticancer agent, antitumor pharmaceutical composition) containing the hypoxic stress response inhibitor of the present invention as an active ingredient.
- a therapeutic agent for angiogenesis-related diseases eg, anticancer agent, antitumor pharmaceutical composition
- the therapeutic agent for angiogenesis-related diseases includes a therapeutic agent for angiogenesis-related diseases, which contains a female hormone inhibitor as an active ingredient.
- transgenic non-human animal in the present specification, “transgenic non-human animal”, “ Knockout non-human animals ", or simply” animals ").
- transgenic non-human animal of the present invention can be suitably used, for example, for screening a drug for the treatment of a disease requiring control of a hypoxic stress response. It is also very useful as an experimental model animal for studying the hypoxic stress response and elucidating the mechanism of the above-mentioned diseases.
- Transgenic non-human animals in the present invention include so-called “knock-down animals” in which gene expression is suppressed by the action of antisense RNA or siRNA.
- int6 gene expression is artificially suppressed means, for example, (1) nucleotide insertion, deletion, substitution, etc. in one or both of the 1 nt6 gene pairs A state in which the gene expression is suppressed by having a gene mutation, (2) a state in which the gene expression is suppressed by the action of the nucleic acid of the present invention (for example, antisense RNA or siRNA), etc. Can be mentioned.
- the expression of Int6 gene is completely suppressed, and the expression level of Int6 in the animal of the present invention is the same as the expression level of Int6 gene in the wild-type animal. In the case where it is significantly decreased as compared, it is included.
- the site where the gene mutation is present in the present invention is not particularly limited as long as the expression of the gene is suppressed, and examples thereof include an exon site and a promoter site.
- the transgenic non-human animal of the present invention can be produced by those skilled in the art by generally known genetic engineering techniques.
- a gene knockout mouse can be prepared as follows. First, a DNA containing the exon portion of the Int6 gene of the present invention is isolated from a mouse, and an appropriate marker gene is inserted into this DNA fragment to construct a targeting vector. This targeting vector is introduced into a mouse ES cell line by, for example, the electopore position method, and a cell line that has undergone homologous recombination is selected.
- the marker gene to be inserted is preferably an antibiotic resistance gene such as a neomycin resistance gene.
- the obtained ES cell line can be injected into a mouse blastoderm to obtain a chimeric mouse.
- a mouse in which one of the Int6 gene pair of the present invention is inactivated can be obtained.
- mice in which both gene pairs of the gene of the present invention are inactivated Genetic modification can also be carried out in the same manner in animals in which ES cells other than mice have been established.
- the knockout animal of the present invention is preferably a knockout (knockdown) animal characterized in that expression of the Int6 gene is suppressed by introducing the nucleic acid of the present invention into a non-human animal. It is. [0077]
- the knockdown animal can also be produced by introducing a vector having a structure capable of expressing the nucleic acid of the present invention (such as antisense RNA or siRNA) into a non-human animal.
- a non-human animal with reduced expression of Int6 is produced by injecting a siRNA expression vector having the nucleotide sequence of SEQ ID NOs: 5 to 7 into the neck of the non-human animal subcutaneously. can do. More specifically, the transgenic non-human animal of the present invention can be produced by the method described in the examples described later.
- the kind of the transgenic animal of the present invention is not particularly limited as long as it is a non-human animal, but is usually a mammal, preferably a primate. More specifically, the animal of the present invention is preferably a mouse, a rat, a fly, a nematode (C. Elegans), a rabbit, a pig, a bird, or a hedge, and more preferably a mouse.
- a knockdown (transgenic) plant targeting the gene can also be produced.
- the transgenic non-human animal of the present invention is not particularly limited, but the expression of the Int6 gene is caused by the action of any of the following nucleic acids (a) to (c). Is an animal that is suppressed.
- the present invention also provides a method for screening a therapeutic agent for vascular diseases using the expression level or activity of Int6 as an index.
- a compound that decreases (suppresses) the expression level of the Int6 gene is expected to be a drug for the treatment of vascular diseases. Conversely, compounds that increase (enhance) the expression level of the Int6 gene are expected to be drugs for the treatment of diseases caused by angiogenesis, such as cancer.
- a preferred embodiment of the above method of the present invention is a screening method for a therapeutic agent for vascular disease, comprising the following steps (a) to (c).
- Another embodiment of the method of the present invention is a screening method for an angiogenesis-related disease therapeutic drug (for example, an anticancer drug) comprising the following steps (a) to (c).
- an angiogenesis-related disease therapeutic drug for example, an anticancer drug
- a test compound is brought into contact with cells expressing the Int6 gene.
- cells expressing the Int6 gene examples include cells derived from humans, mice, rats, etc., and are not particularly limited to cells derived from these, and E. coli transformed to express Int6. It is also possible to use microbial cells such as yeast.
- microbial cells such as yeast.
- a cell expressing the Int6 gene a cell expressing the endogenous Int6 gene or a cell into which an exogenous Int6 gene has been introduced and expressing the gene can be used.
- a cell in which an exogenous Int6 gene is expressed can usually be prepared by introducing an expression vector in which an Int6 gene is inserted into a host cell.
- the expression vector can be produced by general genetic engineering techniques.
- the expression level of the Int6 gene is then measured.
- gene expression includes both transcription and translation.
- the gene expression level can be measured by methods known to those skilled in the art. For example, mRNA is extracted from cells expressing Int6 gene according to a standard method, and the transcription amount of the gene is measured by performing Northern hybridization method or RT-PCR method using this mRNA as a cocoon. be able to.
- the amount of translation of the gene can be measured by collecting the protein fraction from cells expressing the Int6 gene and detecting the expression of the Int6 protein by electrophoresis such as SDS-PAGE.
- an antibody used for detecting Int6 protein any antibody can be used as long as it is a detectable antibody.
- a monoclonal antibody and a polyclonal antibody can be used.
- a compound that decreases the expression level or a compound that increases the level is then selected as compared with the case where the test compound is not contacted (control).
- a compound that lowers becomes a drug for the treatment of vascular diseases, while a compound that increases increases a therapeutic agent for diseases (for example, cancer) that can exert a therapeutic effect by suppressing angiogenesis.
- Another embodiment of the screening method of the present invention is a method of selecting a compound that decreases or increases the expression level of the Int6 gene of the present invention using reporter gene expression as an indicator.
- a preferred embodiment of the method of the present invention is a screening method for a therapeutic agent for vascular disease, comprising the following steps (a) to (c).
- Cells containing DNA having a structure in which a transcriptional regulatory region of the Int6 gene and a reporter gene are functionally linked include cells in which the structure is inserted into the chromosome.
- the insertion of DNA structures into chromosomes is commonly used by those skilled in the art. For example, gene transfer using homologous recombination.
- a cell extract containing DNA having a structure in which a transcriptional regulatory region of an Int6 gene and a reporter gene are functionally linked refers to, for example, a cell extract contained in a commercially available in vitro transcription / translation kit.
- a cell extract contained in a commercially available in vitro transcription / translation kit there may be mentioned those obtained by adding DNA having a structure in which the transcriptional regulatory region of the Int6 gene and the reporter gene are functionally linked.
- Another embodiment of the above-described method of the present invention is a screening method for an angiogenesis-related disease therapeutic drug (for example, an anticancer drug) including, for example, the following steps (a) to (c).
- an angiogenesis-related disease therapeutic drug for example, an anticancer drug
- (c) a step of selecting a compound that increases the activity of the protein as compared to the measurement in the absence of the test compound.
- Examples include binding activity with F2a (interaction activity).
- interaction activity Those skilled in the art can appropriately measure the activity by a known method such as immunoprecipitation or yeast two-hybrid method.
- Another embodiment of the screening method of the present invention is a method using the binding activity between Int6 protein and HIF2 ⁇ protein as an index.
- the Int6 protein of the present invention is a protein having a binding (interaction) activity to HIF2 protein. Therefore, by using the binding activity of Int6 protein and HIF2a protein as an index, by selecting a substance that enhances or decreases (suppresses) the binding activity, it suppresses drugs or angiogenesis for the treatment of vascular diseases. By doing so, it is possible to screen for therapeutic agents for diseases (for example, cancer, etc.) that can exert therapeutic effects.
- diseases for example, cancer, etc.
- the above-described method of the present invention is, for example, a screening method for a therapeutic agent for vascular diseases, comprising the following steps (a) to (c).
- Examples of the method of the present invention include a screening method for an angiogenesis-related disease therapeutic drug (for example, an anticancer drug) including the following steps (a) to (c).
- an angiogenesis-related disease therapeutic drug for example, an anticancer drug
- (c) a step of selecting a compound that increases the binding activity as compared to the measurement in the absence of the test compound.
- Int6 protein and HIF2 a protein used in the above method contain mutations. However, it is preferably a wild-type protein, but may be a protein (polypeptide) in which a part of the amino acid sequence of these proteins is substituted 'deleted as long as it has interactive activity.
- the Int6 protein used in the above method is a wild-type protein containing no mutation.
- the region in Int6 protein involved in binding to HIF2 a protein is usually a region called “Domainl” present at the N-terminus. Therefore, the Int6 protein used in the above method may be a partial fragment peptide of the protein including “Domainl”.
- the “0 01 1 ⁇ 111” is a region corresponding to positions 1 to 80 in the amino acid sequence of Int6 protein described in SEQ ID NO: 2.
- the expression of the Int6 gene is suppressed, and as a result, a high angiogenic effect is observed.
- the transgenic non-human animal it is possible to efficiently screen for compounds that suppress angiogenesis.
- Compounds obtained by this screening method are expected as therapeutic agents for angiogenesis-related diseases (for example, anticancer agents).
- the screening method of the present invention is a method using the transgenic non-human animal of the present invention and using Int 6 expression or function (activity) or angiogenic effect as an index.
- the above method is a method for screening a therapeutic agent for vascular diseases, comprising the following steps (a) to (c).
- a test compound is administered to a transgene non-human animal.
- the test compound can be administered either orally or parenterally, but parenteral administration is preferred when the test compound is a peptide.
- Specific examples include vascular administration, nasal administration, pulmonary administration, and transdermal administration.
- Examples of vascular administration include, for example, intravenous injection, intramuscular injection, intraperitoneal injection, subcutaneous injection, and the like.
- a compound that decreases the expression level or activity of the Int6 gene or a compound that suppresses angiogenesis is selected compared to the case where the test compound is not administered (control).
- the drug of the present invention can be mixed with physiologically acceptable carriers, excipients, diluents and the like, and can be administered orally or parenterally as a pharmaceutical composition.
- Oral preparations can be made into dosage forms such as granules, powders, tablets, capsules, solvents, emulsions or suspensions.
- a parenteral preparation a dosage form such as an injection, a drip infusion, an external medicine, or a suppository can be selected. Examples of injections include subcutaneous injections, intramuscular injections, and intraperitoneal injections.
- injections include subcutaneous injections, intramuscular injections, and intraperitoneal injections.
- topical drugs it is possible to indicate nasal agents or ointments.
- the preparation technique of the above dosage form so as to include the drug of the present invention as the main component is known.
- a tablet for oral administration can be produced by adding an excipient, a disintegrant, a binder, a lubricant, and the like to the drug of the present invention, mixing, and compression-molding.
- excipients In general, lactose, starch, mannitol or the like is used.
- disintegrant calcium carbonate or carboxymethyl cellulose calcium is generally used.
- lubricant talc magnesium stearate and the like are known.
- an injection can be obtained by dissolving the agent of the present invention as a main component together with an appropriate dispersant, or dissolving or dispersing in a dispersion medium.
- aqueous solvent distilled water, physiological saline, Ringer's solution, or the like is used as a dispersion medium.
- oil-based solvents various vegetable oils such as propylene glycol are used as dispersion media.
- a preservative such as paraben can be added as necessary.
- a known isotonic agent such as sodium salt sodium glucose can be added to the injection.
- a soothing agent such as benzanoreconium chloride hydrochloride can be added.
- an external preparation can be obtained by making the agent of the present invention into a solid, liquid or semi-solid composition.
- a solid or liquid composition it can be set as an external preparation by setting it as the composition similar to what was described previously.
- a semi-solid composition can be prepared by adding a thickener to an appropriate solvent as required.
- the solvent water, ethyl alcohol, polyethylene glycol, or the like can be used.
- the thickener bentonite, polybutyl alcohol, acrylic acid, methacrylic acid, or polyvinyl pyrrolidone is generally used.
- a preservative such as salt or benzanoreconium.
- a suppository can also be obtained by combining an oily base material such as cacao butter or an aqueous gel base material such as cellulose derivative as a carrier.
- the necessary amount of the drug of the present invention is administered to mammals including humans within the safe dose range.
- the dosage of the drug of the present invention can be appropriately determined finally by the judgment of a doctor or veterinarian in consideration of the type of dosage form, administration method, patient age and weight, patient symptoms, and the like.
- the "therapeutic agent" in the present invention includes not only a drug having a therapeutic effect but also a drug having a preventive effect.
- Example 2 HIF1 a, HIF2 ⁇ , and specific interaction between HIF3 a and Int6 in yeast cells
- Plasmid pM-marked HA-Int6wt was transfected into three types of cells: MCF7, A549, and COS7. Later, it was found that Int6 is expressed mainly in cell cytosol. However, due to cell death, confirmation on IF was difficult. However, Int6, which partially migrated to the nucleus, was observed to co-localize with HI F2 a.
- Int6 was found to regulate HIF2a transcriptional activity through the PINT (PCI) domain (Fig. 2).
- Int6_AC also promoted transcriptional activity of HIF2 ⁇ in both normoxia and hypoxia by co-expression of HIF2 human.
- Int6 wt is also responsible for cell death of MCF7 cells. It caused the transcriptional activity of HIF2 ⁇ to be suppressed under normoxic and hypoxic conditions (Fig. 2).
- siRNA expression plasmid and Int6_AC were co-transformed into MCF7 cells
- the underline represents "sense oligo” and "antisense oligo”.
- An RNA molecule having a double-stranded region functions as an siRNA.
- HVJ-E encapsulated siRNA for one mouse was prepared as follows.
- mice Ten-week-old female BALB / C mice (body weight around 25 g) were used in the experiment. The day before the subcutaneous injection of Int6 vector 1 siRNA, the back of the neck of the mouse was treated with a hair removal cream. On the day of the experiment, mice were anesthetized with halothane, and siRNA encapsulated in 50 ⁇ l of HVJ-E was injected subcutaneously into the back of the neck with a 27GX3 / 4 syringe. After that, they were raised for 5 days with normal feeding. Subsequently, the mouse was sacrificed by cervical dislocation, and about 1.5 cm 2 of skin was excised centering on the siRNA injection site. After photographing the back of the skin, it was fixed with formalin.
- the mouse Int6 oligo sequence used is shown below. Each oligo sequence was prepared based on the mouse sequence.
- estrogen estradiol, E2
- progesteron Progestin
- estrogen receptor inhibitor tamoxifen 40H-TAM
- Int6 interacts directly with HIF2a (Fig. 11), and there is a binding site in the region of 571_640a at the C-terminus of HIF2 ⁇ . (Fig. 12), and it was found that the transcription of the hypoxic stress response gene of HIF2a was strongly repressed in the same manner as VHL in HIF1a.
- Int6 has a C-terminal region that binds to the lid of the proteasome (the lid), and HIF2 a bound to Int6 can be decomposed by pulling it into the proteasome. It can be understood that it is the essence of ⁇ control.
- hypoxia-independent aspect of HIF2a has been reported.However, the present inventors have shown that HIF1 ⁇ is 100% hypoxia-dependent, whereas HIF2a is not hypoxia-independent. It became clear that it was controlled by Int6. In other words, HIF2a is controlled mainly by Int6.
- Substances that inhibit Int6 gene expression or Int6 function promote the expression of HIF2 regardless of hypoxia and translocation into the nucleus, resulting in a hypoxic stress response. It is expected to promote transcription of genes and exhibit angiogenic effects. Such substances are expected to have high angiogenic effects and specificity, and have therapeutic effects on various vascular diseases such as obstructive arteriosclerosis, restenosis after percutaneous vasodilatation (PCT), and myocardial infarction. It is expected to have.
- PCT percutaneous vasodilatation
- Int6 acts as a tumor suppressor during breast cancer and other cancerations. This is a concern that when specific siRNA is introduced into cells, it may cause canceration. This can be a big problem especially in clinical application.
- the present inventors introduced a vector-type siRNA that always expresses Int6_siRNA at the time of cell introduction into the cell and observed it for a long time.
- the introduction of vector-type siRNA that completely suppresses endogenous Int 6 shortens cell survival and stops cell growth within 7 weeks. Induced. This is because translational regulation is one of the roles of Int6, and complete suppression is due to abnormal translational regulation.
- Int6 is one of the translational regulators, eIF3e / p48.
- MMTV mouse Mammalian Tumor Virus
- Int6 integrates into 9 genetic loci ( integration) to destroy the target gene at that location.
- the ability to hit the 6th integration site of this disrupted gene was named Int6.
- Int6 lacked a part of the C-terminus due to MMTV infection, so-called a constitutively inactivated (dominant negative) mutant (Int6- ⁇ C), and developed breast cancer (Fig. 8). .
- the mechanism for why this mutant develops breast cancer was unknown.
- substances having an inhibitory effect on the expression of Int6 are expected to have high levels and angiogenic effects, and are suitable for treatment of obstructive arteriosclerosis, restenosis after percutaneous vasodilatation (PCT), myocardial infarction, etc Is expected to be applied.
- siRNA which is expected to inhibit Int6's specific expression, may be a therapeutic agent with a completely new concept of enhancing the expression of genes with therapeutic effects by suppressing the function of transcriptional regulators.
- the present inventors completely reduced canceration by knocking down Int6, which has been reported as a translational regulatory factor (eIF3e) or a breast cancer suppressor, with an siRNA expression vector. It was shown by animal experiments using mice that normal arteries can be regenerated. In addition, the siRNA target cells were revealed to be carrier cells such as fibroblasts. This strongly demonstrates the possibility that new arteries can be generated by culturing and proliferating carrier cells such as fibroblasts collected from patients, introducing ex vivo synthetic siRNA, and then autotransplanting into the affected area. It is. If autologous transplantation is used to return cells (siRNA-treated angiogenesis-inducing cells) collected from patients into which siRNA has been introduced to the affected area, carrier development, which is a bottleneck for siRNA drug development, will be unnecessary.
- siRNA target cells such as fibroblasts
- obstructive arteriosclerosis myocardial infarction
- cerebral infarction aiming at the development of treatment methods are expected to increase in the number of patients with the increase in lifestyle-related diseases, and new blood vessels will be constructed in the future. It is a disease that is expected to be cured. In addition, it can be expected to be applied to muscle regeneration by revascularization of liver parenchymal cells in cirrhosis and vascularization in neuromuscular degenerative diseases.
- ES cells embryonic stem cells
- stromal stem cells angiogenesis is indispensable for ensuring blood circulation to the reconstructed tissue.
- carrier cells such as patient's own fibroblasts treated with synthetic siRNA for Int6 are self-transplanted, so that obstructive arteriosclerosis, myocardial infarction, brain
- siRNA-treated angiogenesis-inducing cells such as patient's own fibroblasts treated with synthetic siRNA for Int6 are self-transplanted, so that obstructive arteriosclerosis, myocardial infarction, brain
- siRNA for Int6 are self-transplanted, so that obstructive arteriosclerosis, myocardial infarction, brain
- siRNA for Int6 are self-transplanted, so that obstructive arteriosclerosis, myocardial infarction, brain
- neovascular bypass therapy applicable to regenerative medicine such as infarct treatment and liver regeneration.
- Autologous carrier cells such as fibroblasts have already been used as artificial skin, and it is considered possible to prepare "siRNA-treated angiogenesis-inducing cells" according to the protocol at that time. It is done. Specifically, carrier cells such as fibroblasts are collected from the patient's own virus test negative skin pieces and cultured in large quantities to create a master cell and a working cell. The master cell is again tested for viruses and confirmed to be negative, and then the working cells are thawed sequentially and subcultured to prepare carrier cells for “siRNA-treated angiogenesis-inducing cells”. During preparation, it is necessary to perform a mycoplasma test and a bacterial / fungal test to confirm that it is negative. Carrier cells for prepared “siRNA-treated angiogenesis-inducing cells” can be stored frozen and supplied as needed.
- Int6 has been found to be a suitable target molecule for drug discovery
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Abstract
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JP2007516291A JPWO2006123644A1 (ja) | 2005-05-16 | 2006-05-16 | 低酸素ストレス応答に関与するInt6タンパク質、およびその利用 |
AU2006248487A AU2006248487A1 (en) | 2005-05-16 | 2006-05-16 | Int6 protein involved in hypoxia stress response and use thereof |
EP06746434A EP1902729A1 (en) | 2005-05-16 | 2006-05-16 | Int6 PROTEIN INVOLVED IN HYPOXIA STRESS INDUCTION AND USE THEREOF |
CA002609102A CA2609102A1 (en) | 2005-05-16 | 2006-05-16 | Int6 protein involved in hypoxia stress induction and use thereof |
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- 2006-05-16 WO PCT/JP2006/309720 patent/WO2006123644A1/ja active Application Filing
- 2006-05-16 CN CNA2006800256609A patent/CN101237884A/zh not_active Withdrawn
- 2006-05-16 KR KR1020077029242A patent/KR20080044205A/ko not_active Application Discontinuation
- 2006-05-16 EP EP06746434A patent/EP1902729A1/en not_active Withdrawn
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JPH11500004A (ja) * | 1995-02-09 | 1999-01-06 | アメリカ合衆国 | 腫瘍遺伝子Int6のヌクレオチド配列及び推定アミノ酸配列 |
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Cited By (2)
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---|---|---|---|---|
WO2010110268A1 (ja) * | 2009-03-23 | 2010-09-30 | 財団法人東京都医学研究機構 | 細胞死を予防するための医薬剤 |
JP2010222289A (ja) * | 2009-03-23 | 2010-10-07 | Tokyoto Igaku Kenkyu Kiko | 細胞死を予防するための医薬剤 |
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CN101237884A (zh) | 2008-08-06 |
KR20080044205A (ko) | 2008-05-20 |
AU2006248487A1 (en) | 2006-11-23 |
JPWO2006123644A1 (ja) | 2008-12-25 |
EP1902729A1 (en) | 2008-03-26 |
CA2609102A1 (en) | 2006-11-23 |
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