WO2010079833A1 - 新規癌抗原eEF2 - Google Patents
新規癌抗原eEF2 Download PDFInfo
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- WO2010079833A1 WO2010079833A1 PCT/JP2010/050174 JP2010050174W WO2010079833A1 WO 2010079833 A1 WO2010079833 A1 WO 2010079833A1 JP 2010050174 W JP2010050174 W JP 2010050174W WO 2010079833 A1 WO2010079833 A1 WO 2010079833A1
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- WIPO (PCT)
- Prior art keywords
- eef2
- cancer
- seq
- peptide
- amino acid
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- 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
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/118—Prognosis of disease development
-
- 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
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/158—Expression markers
Definitions
- the present invention provides a method for detecting cancer and a pharmaceutical composition for cancer treatment / prevention. Furthermore, the present invention relates to peptides comprising consecutive amino acids derived from eEF2 protein having the ability to bind to HLA molecules, pharmaceutical compositions for cancer treatment / prevention comprising these peptides, and more particularly to HLA-A * 2402 restriction Provided are an eEF2 peptide, an HLA-A * 0201 restricted eEF2 peptide, or an HLA-A * 0206 restricted eEF2 peptide, and a pharmaceutical composition for treating / preventing cancer containing the same. Note that this application claims priority to Japanese Patent Application No. 2009-002608, the entire contents of which are incorporated herein by reference.
- cancer markers have been known so far, but there are few cancer markers capable of diagnosing many types of cancer with one marker, and search for such cancer markers is eagerly performed.
- molecular target drugs for cancer such as trastuzumab targeting HER2, imatinib targeting one of tyrosine kinases, gefitinib targeting EGFR, and rituximab targeting CD20 antigen are being developed one after another.
- a pharmaceutical composition for cancer treatment / prevention that targets eEF2 (eukaryotranslation elongation factor 2) which is known as a translation elongation factor
- antigen proteins have been searched for various cancers, but few have been proven as cancer antigens. Nygard O, Nilsson L. Kinetic determination of the effects of ADP-ribosylation on the interaction of eukaryotic elongation factor 2 with ribosomes. J Biol Chem. 1990; 265: 6030-4
- a problem to be solved by the present invention is to provide a method for detecting cancer using proteins expressed in various types of cancer as an index, and a pharmaceutical composition for treating or preventing cancer detected by the method. . Furthermore, it is providing the pharmaceutical composition containing the cancer antigen peptide derived from this protein.
- the present inventors have conducted intensive research to solve the above problems. Then, one marker protein eEF2 that is highly expressed in various types of cancer tissues is found, a method for detecting cancer using the marker protein expression and an antibody produced in the body against the marker protein as an index, and targeting the eEF2 protein A pharmaceutical composition for the treatment / prevention of cancer was completed. Furthermore, the present inventors have found that a part of a continuous amino acid sequence encoding eEF2 protein functions as a cancer antigen peptide, and can use these as a pharmaceutical composition for treating / preventing cancer. Showed that.
- the present invention (1) A method for detecting a cancer of a subject, comprising a step of examining the presence or amount of an eEF2 polypeptide, eEF2 antibody or eEF2 gene transcript in a sample obtained from the subject, (2)
- the cancer is lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous cell carcinoma of the head and neck, esophageal cancer, squamous cell carcinoma of the esophagus, stomach cancer, colon cancer, pancreatic duct cancer, glioblastoma, and
- the method according to (1) selected from the group consisting of malignant lymphomas, (3) A double-stranded siRNA that inhibits the growth of cancer cells, wherein the sense strand consists of the RNA sequence shown in SEQ ID NO: 2 and the antisense strand consists of the RNA sequence shown in SEQ ID NO: 3.
- Single-stranded siRNA (4) The double-stranded siRNA according to (3), wherein the cancer cell is derived from a cancer selected from the group consisting of stomach cancer, lung cancer, pancreatic cancer, glioblastoma and malignant lymphoma, (5) A pharmaceutical composition for treating or preventing cancer, comprising the double-stranded siRNA according to (3) or (4) as an active ingredient, (6) A method for treating or preventing cancer, which comprises administering an effective amount of the pharmaceutical composition of claim 5 to a subject, (7) Use of the double-stranded siRNA according to (3) or (4) for the manufacture of a medicament for treating or preventing cancer, (8) shRNA that inhibits the growth of cancer cells, which targets mRNA transcribed from the DNA sequence shown in SEQ ID NO: 18 or 19, (9) A nucleic acid to which the shRNA according to (8) is transcribed, the nucleic acid having a DNA sequence shown in SEQ ID NO: 20 or 22.
- a vector comprising the nucleic acid according to (9), (11) A pharmaceutical composition for treating or preventing cancer, comprising the shRNA according to (8), the nucleic acid according to (9) or the vector according to (10), (12) A method for treating or preventing cancer, which comprises administering an effective amount of the pharmaceutical composition according to (11) to a subject, (13) Use of the shRNA according to (8), the nucleic acid according to (9), or the vector according to (10) for the manufacture of a medicament for treating or preventing cancer, (14) An eEF2 peptide having an amino acid sequence consisting of consecutive amino acids derived from eEF2 protein, wherein the amino acid sequence is (A) Arg Phe Tyr Ala Phe Gly Arg Val Phe (SEQ ID NO: 4); (B) Ala Phe Gly Arg Val Phe Ser Gly Leu (SEQ ID NO: 5); (C) Arg Phe Asp Val His Asp Val Thr Leu (SEQ ID NO: 6); (D) Ala Tyr Leu Pro Val Asn
- multiple types of cancers such as lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous epithelium of the head and neck in a subject with or at risk of having cancer or prognosis Cancer, esophageal cancer, squamous cell carcinoma of the esophagus, stomach cancer, colon cancer, pancreatic duct cancer, glioblastoma, malignant lymphoma, etc.
- the proliferation of cancer cells detected by the method can be inhibited.
- HLA-A * 2402 Alternatively, induction of eEF2-specific CTL in vivo and in vitro in subjects with HLA-A * 0201 is possible. In particular, about 55% of Japanese have at least one HLA-A * 2402 molecule and about 19.9% have at least one HLA-A * 0201 molecule, which makes eEF2 specific in a very wide range of subjects. CTL can be induced.
- FIG. 1 shows that eEF2 IgG antibody was detected in serum from lung cancer patients.
- FIG. 2 shows the results of immunostaining with anti-eEF2 antibody in lung tissue sections obtained from patients with non-small cell lung cancer (left) and small cell lung cancer (right).
- FIG. 3 shows immunization using anti-eEF2 antibody in tissue sections of head and neck squamous epithelium and esophageal squamous epithelium obtained from patients suffering from squamous cell carcinoma of the head and neck (left) and esophageal squamous cell carcinoma (right). The results of staining are shown.
- FIG. 1 shows that eEF2 IgG antibody was detected in serum from lung cancer patients.
- FIG. 2 shows the results of immunostaining with anti-eEF2 antibody in lung tissue sections obtained from patients with non-small cell lung cancer (left) and small cell lung cancer (right).
- FIG. 3 shows immunization using anti-eEF2 antibody in tissue sections of head and
- FIG. 4 shows the results of immunostaining with anti-eEF2 antibody in stomach and colon tissue sections obtained from patients suffering from stomach cancer (left diagram) and colon cancer (right diagram).
- FIG. 5 shows the detection of eEF2 antibody in sera obtained from patients with various cancers and healthy individuals.
- FIG. 6 shows that in non-small cell lung cancer patients, prognosis is good in subjects with high serum eEF2 antibody titers.
- FIG. 7 shows that double-stranded siRNA targeting the eEF2 gene mRNA suppresses the growth of gastric cancer cell lines.
- FIG. 8 shows that double-stranded siRNA targeting the mRNA of the eEF2 gene suppresses cell growth of various cancer cell lines.
- FIG. 9 shows the cytotoxic activity of CTL induced with eEF2 786-794 peptide.
- FIG. 10 shows the cytotoxic activity of CTLs induced with the eEF2 786-794 peptide against cells expressing endogenous eEF2 gene.
- FIG. 11 shows a diagram of FACS analysis of interferon ⁇ induced using eEF2 739-747 peptide.
- FIG. 12 shows the analysis of interferon ⁇ induced using eEF2 661-669 peptide by FACS.
- FIG. 13 is a diagram showing that forced expression of eEF2 protein promotes the progression of the cell cycle G2 / M phase.
- FIG. 14 shows that forced expression of eEF2 protein promotes tumor formation in vivo.
- FIG. 15 shows that forced expression of eEF2 protein promotes tumor formation in vivo.
- FIG. 16 shows the cytotoxic activity of CTL induced with eEF2 739-747 peptide.
- FIG. 17 shows the cytotoxic activity of CTL induced with eEF2 519-527 peptide.
- FIG. 18 shows the cytotoxic activity of CTL induced with eEF2 671-679 peptide.
- FIG. 19 shows the cytotoxic activity of CTL induced with eEF2 661-669 peptide.
- FIG. 20 shows the cytotoxic activity of CTL induced with eEF2 394-402 peptide.
- FIG. 21 shows the cytotoxic activity of CTL induced with eEF2 284-292 peptide.
- FIG. 22 shows the cytotoxic activity of CTL induced with eEF2 292-300 peptide.
- FIG. 23 is a diagram showing the cytotoxic activity of CTL induced using eEF2 292-300 2L peptide.
- FIG. 24 shows the cytotoxic activity of CTL induced using eEF2 292-300 2M peptide.
- FIG. 25 shows the cytotoxic activity of CTL induced with eEF2 292-300 2L9L peptide.
- FIG. 26 shows the results of measurement of interferon- ⁇ activity when pulsed with eEF2 292-300 peptide or modified eEF2 292-300 peptide (eEF2 292-300 2L, eEF2 292-300 2M, and eEF2 292-300 2L9L peptide).
- FIG. FIG. 27 is a diagram showing suppression of cancer cell proliferation in vitro by a novel shRNA of eEF2.
- the number of cells is shown by the ratio (%) of the number of cells into which the vector expressing eEF2 shRNA was introduced relative to the number of cells into which shLuc, a control vector, was introduced.
- FIG. 28 is a diagram showing the results of measurement of interferon- ⁇ activity when pulsed with a modified eEF2 292-300 peptide (eEF2 292-300 2M9L peptide).
- FIG. 29 shows seven types of eEF2 peptides (eEF2 292-300 peptide, eEF2 739-747 peptide, eEF2 519-527 peptide, eEF2 671-679 peptide, eEF2 661-669 peptide, eEF2 394-402 peptide and eEF2 284-292). It is a result of interferon ⁇ activity measurement showing that (peptide) is also a HLA-A * 0206-restricted peptide.
- FIG. 30 is a diagram showing the results of measuring interferon- ⁇ activity when pulsed with three types of eEF2 peptides (eEF2 409-417 peptide, eEF2 412-420 peptide, and eEF2 701-709 peptide).
- the present invention provides a method for detecting cancer.
- the subject that can detect cancer using the method of the present invention may be any animal, for example, human, monkey, mouse, rat, hamster, guinea pig, cow, horse, sheep, goat, pig, dog. , Cats, rabbits and the like, and most preferably humans.
- the present invention can be used even if the subject animal is healthy, and is preferably in a state of having cancer or possibly having cancer. Moreover, even if a subject is a prognosis of cancer treatment, it can be used.
- a feature of the present invention is that cancer can be detected earlier than CEA used as a conventional cancer marker.
- stage I refers to a time period representing the state of a tumor classified into T1 or T2, N0, and M0 in the TNM classification defined by the International Association for Cancer, which is the stage classification of malignant tumors.
- the present invention can be carried out using a sample obtained from the object.
- the sample used in the present invention may be any sample, and for example, a tissue containing cells can be used.
- the sample used in the present invention is preferably various tissue sections or serum.
- Obtaining a sample from a subject can be performed using techniques common to those skilled in the art. For example, when a tissue section is used as a sample used in the present invention, a tissue obtained by surgery or biopsy may be fixed overnight in 10% formalin and then embedded in paraffin to prepare a sliced section. .
- serum when using serum as a sample used for this invention, after coagulating the peripheral blood of object in the test-tube containing a separating agent, you may acquire by centrifugation.
- Cancers that can be detected by the method of the present invention include any cancer that expresses eEF2 protein, preferably lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, head and neck squamous cell carcinoma, esophageal cancer, esophageal squamous epithelium. Cancer, stomach cancer, colon cancer, pancreatic duct cancer, glioblastoma, and malignant lymphoma. Particularly preferred are lung adenocarcinoma, small cell lung cancer, gastric cancer, colon cancer and malignant lymphoma.
- the cancer detected in the present invention may be a cancer at any stage. For example, cancers in any stage of stage I, stage II, or stage III of the TNM classification defined by the above International Union for Cancer may be detected. In the method of the present invention, non-small cell lung cancer can be detected particularly early.
- the eEF2 polypeptide in the present invention means a polypeptide having the amino acid sequence of the eEF2 protein or a partial sequence thereof, and includes the following variants. That is, the eEF2 polypeptide in the present invention may have the amino acid sequence of human eEF2 protein shown in SEQ ID NO: 1, or one or several amino acids are deleted from the amino acid sequence of SEQ ID NO: 1.
- the homology of amino acid sequences can be measured using general sequence analysis tools such as FASTA and BLAST.
- the fragment in the present invention refers to a part of the eEF2 polypeptide.
- the eEF2 polypeptide has properties equivalent to those of the eEF2 protein, and hybridizes with the nucleotide sequence encoding the amino acid sequence shown in SEQ ID NO: 1 under stringent conditions.
- a polypeptide having an amino acid sequence encoded by a nucleotide sequence is included.
- Equivalent properties herein refer to having equivalent biological, chemical, and physical properties as eEF2 proteins.
- the eEF2 protein is derived from humans. However, eEF2 in these animal species may be derived from other animals such as mice, monkeys, rats, cows, and cats. , And can be encompassed by the eEF2 protein herein.
- the conditions for hybridization are appropriately selected by those skilled in the art according to the description of J. Sambrook et al., M “Molecular Cloning: A Laboratory Manual, Second Edition”, 1989, Cold Spring Harbor Laboratory Press. Can do.
- the hybridization conditions may be low stringent conditions, but are preferably highly stringent conditions.
- the low stringent conditions are, for example, 42 ° C., 0.1 ⁇ SSC, 0.1% SDS, and preferably 50 ° C., 0.1 ⁇ SSC in the washing after hybridization according to the above-mentioned literature. 0.1% SDS conditions.
- High stringent conditions include, for example, conditions of 65 ° C., 5 ⁇ SSC and 0.1% SDS. However, those skilled in the art can realize the same conditions by appropriately selecting these elements.
- the detection method of the present invention may be performed by any method.
- the detection method of the present invention can be performed using an antibody against the eEF2 polypeptide.
- an antibody against a polypeptide having the amino acid sequence of any region of the eEF2 polypeptide may be used, for example, positions 1 to 417 or positions 411 to 858 in the amino acid sequence of human eEF2 protein. It may be an antibody against a polypeptide having the region.
- the antibody used in the present invention may be any isotype of IgG, IgA, IgM, IgD, and IgE.
- the antibody used in the present invention may also be a monoclonal antibody or a polyclonal antibody.
- the antibody used in the present invention may be prepared using a general technique or may be commercially available.
- the detection method of the present invention can also be performed using an antibody against the eEF2 antibody.
- the eEF2 antibodies that can be detected by the present invention are those generated in vivo, ie in the body of a subject.
- the antibody against the eEF2 antibody may be prepared by a known technique or may be commercially available.
- Anti-eEF2 antibody H-118, Santa Cruz Biotechnology, Santa Cruz, CA is preferred.
- known means / methods can be used to examine the presence or amount of eEF2 polypeptide or eEF2 antibody in a sample. Any means and method may be used as long as they can detect eEF2 polypeptide or eEF2 antibody qualitatively and quantitatively.
- immunostaining method dot blot method, fluorescent antibody method, complement binding reaction, neutralization It includes immunological protein detection methods such as antibody measurement, immunoprecipitation, Western blotting, radioimmunoassay (RIA), ELISA, and two-hybrid system.
- an immunostaining method or a dot blot method can be preferably used.
- the presence or amount of eEF2 polypeptide or eEF2 antibody in a sample obtained from a subject is expressed as the presence or absence of eEF2 polypeptide or eEF2 antibody in a sample obtained from a healthy subject or a subject at normal time. By comparing with the amount, it can be determined to be positive.
- the antibody titer (densitometric units) of the eEF2 antibody in the serum may be used as an index.
- the antibody titer of the eEF2 antibody in the serum of the subject is measured by dot blot method, and the antibody titer (densitometric units) higher than that of serum from a healthy subject, preferably 1000 or more, more preferably 2000 or more is positive.
- this numerical value may vary depending on various factors such as the type of cancer and tissue, and can be appropriately set by those skilled in the art.
- tissue section is used as a sample
- the degree of staining by immunostaining in the tissue section may be used as a reference.
- a cancer cell that exhibits strong staining compared to the corresponding normal cell may be determined to be positive when it is 25% or more of the entire cancer cell, but those skilled in the art can appropriately determine. .
- the presence or amount of a transcript of the eEF2 gene in a sample can be examined.
- the transcript of the eEF2 gene in the present invention means a product transcribed from a nucleotide sequence encoding the amino acid sequence of the eEF2 polypeptide or a fragment thereof, such as mRNA or any other type of RNA, and fragments thereof. And so on.
- the presence or amount of a polynucleotide having a nucleotide sequence (for example, DNA sequence) encoding the amino acid sequence of the eEF2 polypeptide or a fragment thereof can be examined.
- a means / method common among those skilled in the art may be used as a polynucleotide detection method.
- examples include polynucleotide detection methods such as in situ hybridization, Northern blot, Southern blot, dot blot, RNase protection assay, PCR, RT-PCR, and real-time PCR.
- a gene analysis method using a microarray (for example, a DNA microarray, a microRNA microarray, a protein microarray, etc.) may be performed, but other methods may be used as long as the transcript or polynucleotide can be detected qualitatively and quantitatively. May be.
- the method of the present invention can be used for the prognosis diagnosis of a subject having cancer.
- the cancer to which the method of the present invention can be applied may be any cancer that expresses eEF2 protein as described above, but preferably lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, head and neck squamous cell carcinoma, Esophageal cancer, squamous cell carcinoma of the esophagus, stomach cancer, colon cancer, pancreatic duct cancer, glioblastoma, malignant lymphoma. More preferred is non-small cell cancer.
- the prognosis diagnosis of the present invention it can be judged that the prognosis is better as the antibody titer of the eEF2 antibody in the sample obtained from the subject is higher.
- the antibody titer (densitometric unit) of the eEF2 antibody is, for example, 1000 or more, preferably 2000 or more, and more preferably 4000 or more, but those skilled in the art can appropriately determine it in consideration of various factors. it can.
- the present invention provides a diagnostic for detecting cancer, comprising, as an essential component, an antibody against the eEF2 polypeptide or the eEF2 antibody, or a polynucleotide probe complementary to a transcript of the eEF2 gene or a part thereof. It relates to the kit.
- the antibody or probe is preferably labeled. The labeling can be performed by a general method.
- the kit of the present invention comprises, in addition to an antibody against the eEF polypeptide or eEF2 antibody or a polynucleotide probe complementary to the transcript of the eEF2 gene or a part thereof, for example, a reagent essential for a protein or polynucleotide detection method , Sample acquisition means, reaction vessel, and the like. Generally, an instruction manual is attached to the kit.
- the present invention relates to a double-stranded siRNA that inhibits the growth of cancer cells.
- the cancer cell capable of inhibiting the growth in the present invention may be any cancer that expresses eEF2 protein, preferably lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, head and neck squamous cell carcinoma, esophagus Cancer, esophageal squamous cell carcinoma, gastric cancer, colon cancer, pancreatic duct cancer, glioblastoma, and malignant lymphoma.
- lung adenocarcinoma small cell lung cancer, gastric cancer, colon cancer and malignant lymphoma.
- the siRNA of the present invention is a double-stranded siRNA comprising a sense strand and an antisense strand that target the nucleotide sequence of mRNA transcribed from the human eEF2 gene.
- the nucleotide sequence targeted by the siRNA of the present invention may be a partial sequence of a nucleotide sequence encoding the amino acid sequence shown in SEQ ID NO: 1.
- the siRNA of the present invention is preferably a double-stranded siRNA consisting of a sense strand (SEQ ID NO: 2) and an antisense strand (SEQ ID NO: 3) having the RNA sequence shown below.
- Sense strand of the siRNA of the present invention (SEQ ID NO: 2); 5'-CAUGGGCAACAUUCAUGAUCGAUCCUGUCCU-3 '
- the antisense strand of the siRNA of the invention (SEQ ID NO: 3); 5'-AGGACAGGAUCGAUCAUGAUGUGUGCCCAUG-3 '
- RNA sequences of the siRNA of the present invention are the sequences shown in the above SEQ ID NOs: 2 and 3, in which one, two, or three bases are added, deleted, or substituted. May be. Alternatively, in these sequences, 1 to 3, preferably 1 or 2, more preferably 1 base may be substituted, deleted, added and / or inserted.
- the hybridization conditions in this case are in vivo conditions when the siRNA of the present invention is administered in vivo, and moderate stringent conditions when the siRNA of the present invention is used in vitro as a reagent.
- the sense strand sequence and the target sequence of the siRNA of the present invention have a sequence homology of 90% or more, preferably 95% or more, more preferably 95, 96, 97, 98 or 99% or more.
- the siRNA of the present invention may have an overhang sequence added to the 5 'end or 3' end.
- the overhang sequence is added to either the 5 ′ end or the 3 ′ end of the double-stranded sequence in which the sense strand and the antisense strand are paired in order to increase the stability of the double-stranded siRNA.
- This refers to a protruding sequence, for example, AG, UA, AUG, UUG, AAGCUU, etc. from the 5 ′ side, but any sequence may be used.
- the double-stranded siRNA of the present invention preferably has UU added to the 3 'end of the sense strand and the antisense strand.
- the above-described double-stranded siRNA of the present invention may be shRNA by linking two siRNAs by a loop sequence.
- the double-stranded siRNA of the present invention can be prepared by a general method among those skilled in the art. For example, it may be synthesized chemically or enzymatically in vitro, or synthesized in vivo, but is not limited thereto. A chemical synthesis method is preferred. By these synthesis methods, each chain can be synthesized and then paired under general pairing conditions. In use, it may be appropriately purified as necessary. Moreover, the double-stranded siRNA of the present invention may be prepared as an siRNA expression vector that expresses the RNA sequence (SEQ ID NO: 2 and SEQ ID NO: 3) of the siRNA.
- siRNA-shRNA expression vector or piGENE tRNA Pur (Clontech, Palo Alto, CA) may be used.
- the length of siRNA used in the present invention is not particularly limited. Examples of preferable siRNA of the present invention include 15 to 50 mer siRNA, further preferable example is 20 to 40 mer siRNA, and more preferable example is 25. ⁇ 35 mer (eg, 30 mer) siRNA.
- a double-stranded siRNA capable of hybridizing to the 5′-CAUGGGCAACAUCAUGAUCGAUCCUGUCCU-3 ′ sequence of eEF2 mRNA, each siRNA having a length of 15 to 50 mer, preferably 20 to A 40-mer, more preferably a 25-35-mer (for example, 30-mer) double-stranded siRNA can be mentioned.
- siRNA suppresses the expression of a target gene by binding to mRNA in the introduced cell. Therefore, the double-stranded siRNA of the present invention has a function of suppressing the expression of the eEF2 gene, and can thereby inhibit cell proliferation in the introduced subject.
- siRNA can be introduced or administered by methods known to those skilled in the art such as calcium phosphate method, liposome method, non-liposome method, electroporation, magnetic particles using a transfection reagent, or general siRNA expression vectors. It may be a method that is incorporated into the above and introduced by a known method as described above.
- siRNA expression vectors that express the RNA sequences of the siRNA (SEQ ID NO: 2 and SEQ ID NO: 3) are introduced by a known method.
- the siRNA of the present invention may also be administered as a pharmaceutical composition as described below.
- a pharmaceutical composition for treating or preventing cancer comprising the above double-stranded siRNA as an active ingredient
- the pharmaceutical composition of the present invention may contain a known anticancer agent as an active ingredient in addition to the double-stranded siRNA.
- siRNA as an active ingredient may be incorporated in a vector.
- a vector for example, it may be included in a form cloned into a known siRNA expression vector such as a siRNA expression vector commercially available from the manufacturer or a known siRNA expression vector appropriately recombined according to the mode of use.
- the present invention provides a nucleic acid encoding the siRNA of the present invention and a vector containing the nucleic acid.
- the pharmaceutical composition of the present invention may contain a pharmaceutically acceptable carrier.
- the pharmaceutically acceptable carrier that can be used in the present invention is one selected from the group consisting of physiological saline, distilled water, Ringer's solution, buffered physiological saline, glucose solution, maltoglucose solution, glycerol, ethanol, and liposome. Or it may be a component beyond it, but it is not restricted only to these. Furthermore, you may add other general additives, such as an antioxidant, a buffer aqueous solution, and a bacteriostatic agent, to the pharmaceutical composition of this invention. Diluents, sprays, surfactants, binders and lubricants may also be added to produce injectable solutions, pills, capsules, granules or tablet tablets.
- the pharmaceutical composition of the present invention may be administered orally or parenterally (for example, intravenous administration, intradermal administration, subcutaneous administration, intramuscular administration, nasal administration or oral administration). Alternatively, other dosage forms may be used as long as the active ingredient can be efficiently delivered to the vicinity thereof.
- the effective amount of the siRNA of the present invention administered as the pharmaceutical composition of the present invention is determined based on the subject's condition, such as the subject's weight, age, sex, and health status, and the amount of meal, frequency of administration, administration It can be determined by the method, the amount excreted and the severity of the disease.
- the effective amount of the siRNA of the present invention to be administered as the pharmaceutical composition of the present invention is usually 0.01-100 mg / kg per day, preferably 0.1-10 mg / kg per day.
- the present invention relates to a method for treating or preventing cancer, which comprises administering an effective amount of the above pharmaceutical composition to a subject.
- the cancer to be treated or prevented may be any cancer that expresses eEF2 protein, such as lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous cell carcinoma of the head and neck, esophagus Includes cancer, esophageal squamous cell carcinoma, gastric cancer, colon cancer, pancreatic duct cancer, glioblastoma, and malignant lymphoma.
- the present invention may be preferably administered to a subject determined to be positive by the cancer detection method.
- the present invention relates to the use of the above double-stranded siRNA for the manufacture of a medicament for treating or preventing cancer.
- shRNA short hairpin RNA or small hairpin RNA
- shRNA is usually RNA in which a sense strand and an antisense strand are linked by a loop sequence, and the loop structure may be cleaved in a cell to form a double-stranded siRNA.
- the siRNA of the present invention is preferably a double-stranded siRNA.
- the region of eEF2 targeted by the shRNA or siRNA of the present invention is not particularly limited, but preferred examples include the following DNA sequences: 5′-gcc tggccgagga catcgataaa ggcgagg-3 ′ (SEQ ID NO: 18): alternatively 5′-actcaac cataacactt gatgccgttt ctt-3 ′ (SEQ ID NO: 19)
- ShRNA or siRNA targeting mRNA transcribed from can be mentioned.
- the shRNA of the present invention may be transcribed from a vector containing a DNA sequence consisting of a sense sequence-loop sequence-antisense sequence of the above DNA sequence.
- RNA derived from the sense sequence and the antisense sequence binds to form a short hairpin RNA, which is stabilized.
- the loop sequence used in the present invention may be any sequence and can be appropriately selected by those skilled in the art.
- a preferred siRNA of the present invention 5′-gcc tggccgagga catcgataaa ggcgagg-3 ′ (SEQ ID NO: 18): alternatively hybridized with mRNA transcribed from 5′-actcaac cataacactt gatgccgttt ct-3 ′ (SEQ ID NO: 19)
- a siRNA capable of soy can be mentioned.
- siRNA of the present invention As an example of a more specific siRNA of the present invention, it was transcribed from 5'-gcc tggccgagga catcgataaa ggcgagg-3 '(SEQ ID NO: 18): or 5'-actcaac cataacactt gatgccgttt ctt-3' (SEQ ID NO: 19).
- An siRNA having a sequence complementary to mRNA can be mentioned.
- the siRNA of the present invention may be a double-stranded siRNA consisting of a sense strand and an antisense strand of RNA corresponding to the DNA sequence shown in SEQ ID NO: 18 or 19.
- an RNA that can hybridize to mRNA transcribed from 5′-gcc tggccgagga catcgataaa ggcgagg-3 ′ (SEQ ID NO: 18) and an shRNA containing RNA that can hybridize to the RNA.
- an RNA that can hybridize to mRNA transcribed from 5′-actcaac cataacactt gatgccgttt ctt-3 ′ SEQ ID NO: 19
- an shRNA comprising RNA that can hybridize to the RNA can be mentioned.
- the following DNA sequence 5'-gcc tggccgagga catcgatgaa agcgtgg cttcctgtca cctcgcc tttatcgatg tcctcggcca ggc-3 '(SEQ ID NO: 20); 5′-actcaac cataacactt gataccattt gtt cttcctgtca aag aacggcatc aagtgttatg gttgagt-3 ′ (SEQ ID NO: 22); 3'-cgg accggctcct gtagctactt tcgcacc gaaggacagt ggagcgg aaatagctac aggagccggt cg-5 '(sequence number: 21); or 3'-tgagttg g g g g g g gttg g
- the sequence homology may be 95% or more, preferably 95% or more, more preferably 95, 96, 97, 98 or 99% or more.
- the homology, hybridization conditions, and siRNA length are as described above.
- one, two, or three bases may be added, deleted, substituted and / or inserted in the above DNA sequence or RNA sequence.
- ShRNA or siRNA of the present invention can be prepared by a general method among those skilled in the art. For example, it may be synthesized chemically or enzymatically in vitro, or synthesized in vivo, but is not limited thereto.
- the shRNA or siRNA of the present invention may be prepared as an shRNA expression vector or siRNA expression vector comprising the DNA sequence shown in SEQ ID NO: 20 or 22.
- a tRNA-shRNA expression vector or piGENE tRNA Pur (Clontech, Palo Alto, CA) may be used.
- the shRNA or siRNA of the present invention can be introduced or administered by methods known to those skilled in the art such as calcium phosphate method, liposome method, non-liposome method, electroporation, magnetic particles using transfection reagents, or general siRNA. It may be a method that is incorporated into an expression vector and introduced by a known method as described above.
- the shRNA or siRNA of the present invention may be administered as a pharmaceutical composition as described below.
- a pharmaceutical composition for treating or preventing cancer comprising the above shRNA or siRNA as an active ingredient.
- the pharmaceutical composition of the present invention may contain a known anticancer agent together.
- the pharmaceutical composition of the present invention may contain, as an active ingredient, a nucleic acid encoding the shRNA or siRNA of the present invention (for example, a nucleic acid comprising the DNA sequence shown in SEQ ID NO: 20 or 22).
- a nucleic acid encoding the shRNA or siRNA of the present invention for example, a nucleic acid comprising the DNA sequence shown in SEQ ID NO: 20 or 22.
- the nucleic acid containing such a DNA sequence may be a nucleic acid incorporated into a commercially available shRNA expression vector or siRNA expression vector.
- the present invention provides a nucleic acid encoding the shRNA or siRNA of the present invention and a vector containing the nucleic acid.
- the pharmaceutical composition of the present invention may contain general pharmaceutically acceptable carriers and additives.
- the form of administering the pharmaceutical composition of the present invention may be oral administration or parenteral administration (for example, intravenous administration, intradermal administration, subcutaneous administration, intramuscular administration, nasal administration or oral administration).
- an effective amount of the shRNA or siRNA of the present invention administered as the pharmaceutical composition of the present invention includes the subject's condition, such as the subject's weight, age, sex, and health status, and the amount of meal, frequency of administration, It can be determined by the method of administration, the amount excreted and the severity of the disease.
- the present invention relates to a method for treating or preventing cancer, which comprises administering an effective amount of the above pharmaceutical composition to a subject.
- the cancer to be treated or prevented may be any cancer that expresses eEF2 protein, such as lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous cell carcinoma of the head and neck, esophagus Includes cancer, esophageal squamous cell carcinoma, gastric cancer, colon cancer, pancreatic duct cancer, glioblastoma, and malignant lymphoma.
- the present invention relates to the use of the above shRNA or siRNA for the manufacture of a medicament for treating or preventing cancer.
- the present invention relates to a peptide comprising consecutive amino acids from the eEF2 protein.
- the peptide which consists of the amino acid sequence mentioned later or the peptide which consists of an amino acid sequence mentioned later can be mentioned.
- these peptides are capable of binding to HLA molecules.
- these peptides induce cytotoxic activity.
- these peptides are HLA-A * 2402 restricted eEF2 peptide, HLA-A * 0201 restricted eEF2 peptide, or HLA-A * 0206 restricted eEF2 peptide.
- these peptides are 9-30 amino acids in length.
- the present invention provides a pharmaceutical composition for the treatment or prevention of cancer comprising these peptides, the use of these peptides for the manufacture of a medicament for the treatment or prevention of cancer, and administration of these peptides to a subject.
- the present invention also provides a method for treating or preventing cancer characterized by the above.
- the present invention in one aspect provides an HLA-A * 2402 restricted eEF2 peptide.
- the present invention also provides HLA-A * 2402-restricted eEF2 peptides for treating or preventing cancer in HLA-A * 2402-positive subjects, and pharmaceutical compositions containing them.
- the HLA-A * 2402 restricted eEF2 peptide used in the present invention is a peptide having an amino acid sequence consisting of continuous amino acids derived from eEF2 protein or a peptide containing an amino acid sequence consisting of continuous amino acids derived from eEF2 protein,
- the amino acid sequence is Arg Phe Tyr Ala Phe Gly Arg Val Phe (SEQ ID NO: 4); Ala Phe Gly Arg Val Phe Ser Gly Leu (SEQ ID NO: 5); Arg Phe Asp Val His As Val Vale As 6); Ala Tyr Leu Pro Val Asn Glu Ser Phe (SEQ ID NO: 7); and in the amino acid sequence of one of the above, several, for example 1 to 9, preferably 1 to 5, 1 Examples include peptides selected from the group consisting of amino acid sequences in which 1 to 3, 1 to 3, more preferably 1 to 2, more preferably 1 amino acid is substituted, deleted or added.
- one amino acid may comprise a peptide selected from the group consisting of amino acid sequences substituted, deleted, added and / or inserted.
- preferred substitution sites include amino acids at the 2nd and / or 9th positions. Phe or Tyr can be mentioned as a preferable example of the 2nd amino acid of the above-mentioned peptide.
- Ile, Leu, or Phe can be mentioned as a preferable example of the 9th amino acid of the above-mentioned peptide.
- modified peptides include the peptides described in Table 12 or Table 13.
- a preferred eEF2 peptide in the present invention is Ala Tyr Leu Pro Val Asn Glu Ser Phe (SEQ ID NO: 7).
- any of the above peptides is required to have the ability to bind to HLA-A * 2402 molecule.
- the above-mentioned peptide of the present invention may be used for subjects other than HLA-A * 2402 positive subjects. Accordingly, the present invention provides a peptide comprising any of the amino acid sequences described above, and a pharmaceutical composition comprising the peptide.
- the present invention provides HLA-A * 0201 restricted eEF2 peptide.
- the present invention also provides a pharmaceutical composition comprising an HLA-A * 0201 restricted eEF2 peptide for treating or preventing cancer in a HLA-A * 0201 positive subject.
- the HLA-A * 0201 restricted eEF2 peptide used in the present invention is a peptide having an amino acid sequence consisting of continuous amino acids derived from the eEF2 protein or a peptide containing an amino acid sequence consisting of continuous amino acids derived from the eEF2 protein.
- Candidates for HLA-A * 0201 restricted eEF2 peptides used in the present invention are exemplified in Tables 1 to 7 below.
- the amino acid sequence is preferably Arg Leu Met Glu Pro Ile Tyr Leu Val (SEQ ID NO: 8); Lys Leu Val Glu Gly Leu Lys Arg Leu (SEQ ID NO: 9); Leu Asn Glu Ile Lys Asp Ser Val (SEQ ID NO: 10); Ile Leu Thr Asp Ile Thr Lys Gly Val (SEQ ID NO: 11); Leu Met Met Tyr Ile Ser L Arg Thr Phe Cys Gln Leu (SEQ ID NO: 13); Leu Ile Leu Asp Pro Ile Phe Lys Val (SEQ ID NO: 14); and the amino acid sequence of one of the above Several, for example 1 to 9, preferably 1 to 5, 1 to 4, 1 to 3, more preferably 1 to 2, more preferably 1 amino acid, or Peptides selected from the group consisting of deleted or added amino acid sequences are exemplified, but are not limited to these peptides.
- one amino acid may comprise a peptide selected from the group consisting of amino acid sequences substituted, deleted, added and / or inserted.
- a particularly preferred HLA-A * 0201 restricted eEF2 peptide is Arg Leu Met Glu Pro Ile Tyr Leu Val (SEQ ID NO: 8) or Ile Leu Thr Asp Ile Thr Lys Gly Val (SEQ ID NO: 11).
- the HLA-A * 0201 restricted eEF2 peptide of the present invention may in particular be one in which the amino acid at the 2nd position and / or the amino acid at the 9th position is substituted with another amino acid.
- the amino acid at position 2 of the above-mentioned peptide include Leu or Met.
- Leu or Val can be mentioned.
- modified peptides include the peptides listed in Tables 15 to 21, and preferably the second position in Leu Ile Leu Asp Pro Ile Phe Lys Val (SEQ ID NO: 14).
- Particularly preferred examples include Leu Leu Leu Asp Pro Ile Phe Lys Val (SEQ ID NO: 15), Leu Met Leu Asp Pro Ile Phe Lys Val (SEQ ID NO: 16), or Leu Leu Leu Asp Pro Ly Ple L 17) and Leu Met Leu Asp Pro Ile Phe Lys Leu (SEQ ID NO: 24).
- any of the above peptides is required to have the ability to bind to the HLA-A * 0201 molecule.
- the HLA-A * 0201 restricted eEF2 peptide of the present invention may have an action of increasing interferon ⁇ activity.
- the above-mentioned peptide of the present invention may be used for subjects other than HLA-A * 0201 positive subjects. Accordingly, the present invention provides a peptide comprising any of the amino acid sequences described above, and a pharmaceutical composition comprising the peptide.
- the present invention provides HLA-A * 0206-restricted eEF2 peptide.
- the present invention also provides a pharmaceutical composition comprising an HLA-A * 0206-restricted eEF2 peptide for treating or preventing cancer in a HLA-A * 0206-positive subject.
- the HLA-A * 0206-restricted eEF2 peptide used in the present invention is a peptide having an amino acid sequence consisting of continuous amino acids derived from the eEF2 protein or a peptide containing an amino acid sequence consisting of continuous amino acids derived from the eEF2 protein.
- the amino acid sequence is preferably Arg Leu Met Glu Pro Ile Tyr Leu Val (SEQ ID NO: 8); Lys Leu Val Glu Gly Leu Lys Arg Leu (SEQ ID NO: 9); Tyr Leu Asn Glu Ile Lys Asp Ser Val (SEQ ID NO: 10); Ile Leu Thr Asp Ile Thr Lys Gly Val (SEQ ID NO: 11); Leu Tet Met Let Et (SEQ ID NO: 12); Lys Leu Pro Arg Thr Phe Cys Gln Leu (SEQ ID NO: 13); Leu Ile Leu Asp Pro Ile Phe Lys Val (SEQ ID NO: 14) As well as several amino acids, for example 1 to 9, preferably 1 to 5, 1 to 4, 1 to 3, more preferably 1 to 2, More preferably, peptides selected from the group consisting of amino acid sequences in which one amino acid is substituted, deleted and
- one amino acid may comprise a peptide selected from the group consisting of amino acid sequences substituted, deleted, added and / or inserted.
- any of the above peptides is required to retain the binding ability to the HLA-A * 0206 molecule.
- the HLA-A * 0206-restricted eEF2 peptide of the present invention may have an effect of increasing interferon ⁇ activity.
- the above-mentioned peptide of the present invention may be used for subjects other than HLA-A * 0206-positive subjects. Accordingly, the present invention provides a peptide comprising any of the amino acid sequences described above, and a pharmaceutical composition comprising the peptide.
- the peptide used in the present invention is derived from the eEF2 protein, and may consist of or contain the above-mentioned continuous amino acid sequence or a modified sequence thereof.
- the length of the peptide is not particularly limited and may be any peptide.
- Preferable examples of the peptide containing the above-mentioned continuous amino acid sequence include a 9-30 amino acid peptide, a more preferable example is a 9-15 amino acid peptide, and a more preferable example is a 9-12 amino acid peptide.
- the peptide used in the present invention may be, for example, a peptide itself composed of the above amino acid sequence, or may be an eEF2 protein containing the above amino acid sequence or a part thereof.
- the peptide used in the present invention can also bind various substances to the N-terminus and / or C-terminus of the peptide containing the amino acid sequence.
- amino acids, peptides, analogs thereof and the like may be bound.
- these substances are bound to the peptide used in the present invention, these substances are treated with, for example, an in vivo enzyme or a process such as intracellular processing, and finally a peptide comprising the above amino acid sequence is converted.
- cytotoxic T cell CTL inducing effect
- These substances may be those that regulate the solubility of the peptide used in the present invention, may be those that improve the stability such as protease resistance, etc. It may be one that specifically delivers the peptide used in the present invention, or one that has an effect of enhancing the uptake efficiency of antigen-presenting cells. These substances may also be those that increase the ability to induce CTL, such as helper peptides.
- the peptides used in the present invention can be synthesized using methods commonly used in the art or variations thereof. Such synthetic methods include, for example, Peptide Synthesis, Interscience, New York, 1966; The Proteins, Vol 2, Academic Press Inc., New York, 1976; Peptide Synthesis, Maruzen Co., Ltd., 1975; Maruzen Co., Ltd., 1985; Drug Development, Vol. 14, Peptide Synthesis, Hirokawa Shoten, 1991, etc.
- the peptide used in the present invention can also be produced using genetic engineering techniques based on the nucleotide sequence information encoding the peptide used in the present invention. Such genetic engineering techniques are well known to those skilled in the art.
- the present invention relates to a pharmaceutical composition for treating or preventing cancer, comprising the eEF2 peptide.
- the eEF2 gene is highly expressed in, for example, lung adenocarcinoma, small cell lung cancer, esophageal cancer, gastric cancer, colon cancer, pancreatic duct cancer, malignant glioblastoma, malignant lymphoma, squamous cell carcinoma of the head and neck, etc.
- These pharmaceutical compositions can be used for the treatment or prevention of cancers expressing the eEF2 gene.
- the pharmaceutical composition of the present invention When the pharmaceutical composition of the present invention is administered to an HLA-A * 2402 or HLA-A * 0201-positive subject, the HLA-A * 2402 restricted eEF2 peptide or HLA-A * 0201 restricted contained in the pharmaceutical composition
- the eEF2 peptide induces eEF2-specific CTL, which damages cancer cells in the subject.
- the pharmaceutical composition of the present invention may contain, for example, a carrier, an excipient and the like in addition to the eEF2 peptide as an active ingredient.
- the HLA-A * 2402-restricted eEF2 peptide or HLA-A * 0201-restricted eEF2 peptide contained in the pharmaceutical composition of the present invention induces eEF2-specific CTL.
- the pharmaceutical composition of the invention may comprise a suitable adjuvant or be administered with a suitable adjuvant. Preferred adjuvants include, but are not limited to, complete or incomplete Freund's adjuvant, aluminum hydroxide, and the like.
- the pharmaceutical composition of the present invention may also contain a known peptide other than the eEF2 peptide, such as the WT1 peptide, as an active ingredient.
- the administration method of the pharmaceutical composition of the present invention can be appropriately selected according to conditions such as the type of disease, the state of the subject, and the target site.
- Examples of the method include, but are not limited to, intradermal administration, subcutaneous administration, intramuscular administration, intravenous administration, nasal administration, and oral administration. Further, the method may be lymphocyte therapy or DC (dendritic cell) therapy.
- the amount of the peptide contained in the pharmaceutical composition of the present invention, the dosage form of the pharmaceutical composition, the number of administrations and the like can be appropriately selected according to conditions such as the type of disease, the state of the subject, the target site, etc.
- the peptide dosage is usually 0.0001 mg to 1000 mg, preferably 0.001 mg to 10000 mg.
- the present invention provides a method for treating or preventing cancer, which comprises administering an effective amount of the above pharmaceutical composition to an HLA-A * 2402-positive subject or an HLA-A * 0201-positive subject. It is about.
- the cancer to be treated or prevented may be any, for example, lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous cell carcinoma of the head and neck, squamous cell carcinoma of the esophagus, stomach cancer, colon cancer, Includes pancreatic duct cancer, glioblastoma and malignant lymphoma.
- the present invention in yet another aspect, relates to the use of eEF2 peptide for producing the above pharmaceutical composition.
- the present invention relates to a polynucleotide encoding the eEF2 peptide (hereinafter also referred to as eEF2 polynucleotide).
- the polynucleotide of the present invention may be DNA or RNA.
- the base sequence of the polynucleotide of the present invention can be determined based on the amino acid sequence of the eEF2 peptide.
- the polynucleotide can be produced by, for example, a DNA or RNA synthesis method, a PCR method, or the like.
- the present invention relates to an expression vector (hereinafter also referred to as an eEF2 expression vector) containing the polynucleotide.
- the type of expression vector, the sequence contained in addition to the above-mentioned polynucleotide sequence, etc. can be appropriately selected according to the type, purpose, etc. of the host into which the expression vector is introduced.
- the present invention relates to a pharmaceutical composition for treating or preventing cancer, comprising the eEF2 polynucleotide or the eEF2 expression vector.
- a pharmaceutical composition for treating or preventing cancer comprising the eEF2 polynucleotide or the eEF2 expression vector.
- the composition, administration method and the like of the pharmaceutical composition of this aspect of the present invention are as described above.
- the present invention relates to a method for treating or preventing cancer, which comprises administering to a subject a pharmaceutical composition comprising an effective amount of the eEF2 polynucleotide or eEF2 expression vector.
- Cancers to be treated or prevented include, for example, lung adenocarcinoma, non-small cell lung cancer, small cell lung cancer, squamous cell carcinoma of the head and neck, squamous cell carcinoma of the esophagus, stomach cancer, colon cancer, pancreatic duct cancer, glioblastoma, malignant Includes cancers such as lymphoma.
- the present invention relates to the use of an eEF2 polynucleotide or an eEF2 expression vector for producing a pharmaceutical composition comprising the eEF2 polynucleotide or the eEF2 expression vector.
- the present invention relates to a cell containing the eEF2 expression vector.
- the cell of the present invention can be produced, for example, by transforming a host cell such as Escherichia coli, yeast, insect cell or animal cell using the above expression vector.
- a method for introducing an expression vector into a host cell various methods can be appropriately selected and used.
- the peptide of the present invention can also be produced by culturing transformed cells and recovering and purifying the produced eEF2 peptide.
- the present invention relates to an eEF2-specific CTL induced by the eEF2 peptide.
- the CTL of the present invention recognizes a complex of an eEF2 peptide and an HLA-A * 2402 molecule or an HLA-A * 0201 molecule. Therefore, using the CTL of the present invention, HLA-A * 2402-positive or HLA-A * 0201-positive and eEF2-highly expressing tumor cells can be specifically damaged.
- the present invention relates to a method for treating or preventing cancer, characterized in that eEF2-specific CTL is administered to an HLA-A * 2402-positive or HLA-A * 0201-positive subject.
- the administration method of eEF2-specific CTL can be appropriately selected according to conditions such as the type of disease, the state of the subject, and the target site. Examples of the method include, but are not limited to, intravenous administration, intradermal administration, subcutaneous administration, intramuscular administration, nasal administration, and oral administration.
- peripheral blood mononuclear cells are cultured in the presence of the HLA-A * 2402 restricted eEF2 peptide or HLA-A * 0201 restricted eEF2 peptide, and eEF2 is obtained from the peripheral blood mononuclear cells.
- the present invention relates to a method for inducing eEF2-specific CTL, characterized by inducing specific CTL.
- the subject from which the peripheral blood mononuclear cells are derived may be any as long as it has HLA-A * 2402 molecule or HLA-A * 0201 molecule.
- eEF2-specific CTL By culturing peripheral blood mononuclear cells in the presence of HLA-A * 2402-restricted eEF2 peptide or HLA-A * 0201-restricted eEF2 peptide, eEF2-specific CTL can be obtained from CTL precursor cells in peripheral blood mononuclear cells. Be guided. By administering the eEF2-specific CTL obtained by the present invention to an HLA-A * 2402-positive subject or an HLA-A * 0201-positive subject, the hematopoietic tumor and solid cancer of the subject can be treated or prevented.
- peripheral blood mononuclear cells in this specification include immature antigen-presenting cells (for example, precursors such as dendritic cells, B-lymphocytes, and macrophages) that are precursors of antigen-presenting cells. Since immature antigen-presenting cells are contained in, for example, peripheral blood mononuclear cells, such cells may be cultured in the presence of the eEF2 peptide.
- immature antigen-presenting cells for example, precursors such as dendritic cells, B-lymphocytes, and macrophages
- immature antigen-presenting cells are contained in, for example, peripheral blood mononuclear cells, such cells may be cultured in the presence of the eEF2 peptide.
- the present invention relates to a kit for inducing eEF2-specific CTL comprising HLA-A * 2402 restricted eEF2 peptide or HLA-A * 0201 restricted eEF2 peptide as an essential component.
- the kit is used in the method for inducing eEF2-specific CTL.
- the kit of the present invention includes, for example, a means for obtaining peripheral blood mononuclear cells, an adjuvant, a reaction container and the like in addition to the HLA-A * 2402 restricted eEF2 peptide or the HLA-A * 0201 restricted eEF2 peptide. Also good.
- an instruction manual is attached to the kit. Using the kit of the present invention, eEF2-specific CTL can be efficiently induced.
- the present invention relates to an antigen-presenting cell (eg, dendritic cell, B-lymphocyte, macrophage, etc.) that presents the eEF2 peptide via HLA-A * 2402 molecule or HLA-A * 0201 molecule. It is.
- the antigen-presenting cell of the present invention is induced by the HLA-A * 2402 restricted eEF2 peptide or the HLA-A * 0201 restricted eEF2 peptide.
- the eEF2-specific CTL is efficiently induced.
- the present invention provides an antigen-presenting cell that presents the eEF2 peptide via an HLA-A * 2402 molecule or an HLA-A * 0201 molecule as an HLA-A * 2402-positive subject or an HLA-A * 0201-positive subject.
- the present invention relates to a method for treating or preventing cancer, which is characterized in that it is administered.
- the administration method of antigen-presenting cells can be appropriately selected according to conditions such as the type of disease, the state of the subject, and the target site. Examples of the method include, but are not limited to, intravenous administration, intradermal administration, subcutaneous administration, intramuscular administration, nasal administration, and oral administration.
- the present invention provides a method for preventing or treating cancer, characterized in that it induces antigen-presenting cells that present an eEF2 peptide via HLA-A * 2402 molecule or HLA-A * 0201 molecule. Because (A) reacting a sample with a nucleic acid having a nucleotide sequence encoding the amino acid sequence of the eEF2 protein (SEQ ID NO: 1) or a partial sequence thereof or the eEF2 peptide, (B) obtaining an antigen-presenting cell presenting the eEF2 peptide contained in the sample via HLA-A * 2402 molecule or HLA-A * 0201 molecule, (C) The present invention relates to a method comprising the step of administering the antigen-presenting cell to an HLA-A * 2402 positive subject or an HLA-A * 0201 positive subject.
- the sample in the above method may be any sample as long as it may contain lymphocytes or dendritic cells, and examples thereof include a subject-derived sample such as blood, a cell culture medium, and the like.
- the reaction in the above method may be performed using a general method, and is preferably performed using electroporation.
- Obtaining antigen-presenting cells can be performed using methods known to those skilled in the art. Those skilled in the art can appropriately determine the culture conditions of the cells in the sample in each step.
- the method for administering the antigen-presenting cell may be as described above.
- the present invention relates to a kit for preventing or treating cancer comprising a nucleic acid having a nucleotide sequence encoding the amino acid sequence of the eEF2 protein (SEQ ID NO: 1) or a partial sequence thereof, or an eEF2 peptide as an essential component.
- This kit is characterized in that it induces antigen-presenting cells that present the above-mentioned eEF2 peptide via HLA-A * 2402 molecule or HLA-A * 0201 molecule.
- the kit of the present invention may include, for example, a sample obtaining means, a reaction container, and the like in addition to the above essential components. In general, an instruction manual is attached to the kit.
- antigen-presenting cells that present the eEF2 peptide via HLA-A * 2402 molecule or HLA-A * 0201 molecule can be efficiently obtained, and cancer can be obtained by administering this antigen-presenting cell. It can be used for treatment or prevention.
- the present invention relates to an antibody against an HLA-A * 2402 restricted eEF2 peptide or an HLA-A * 0201 restricted eEF2 peptide or an antibody against a polynucleotide encoding the peptide.
- the antibody of the present invention may be a polyclonal antibody or a monoclonal antibody.
- the present invention relates to an eEF2-specific CTL, an antigen-presenting cell that presents the eEF2 peptide via an HLA-A * 2402 molecule or an HLA-A * 0201 molecule, or an HLA-A * 2402-restricted eEF2 peptide.
- the present invention relates to a method for diagnosing cancer, which comprises using an antibody against an HLA-A * 0201 restricted eEF2 peptide or an antibody against a polynucleotide encoding the peptide.
- eEF2-specific CTL is used in the diagnostic method of the present invention.
- the CTL, the antigen-presenting cell or the antibody HLA-A * 2402 to sample and incubated from positive subject or HLA-A * 0201-positive subject, or HLA-A * 2402-positive subject, or HLA-A * 0201-positive subject
- Administration of the CTL, antigen-presenting cell or antibody for example, by determining the position, site, amount, etc. of the CTL, antigen diagnosis, enables cancer diagnosis.
- the CTL, antigen-presenting cell or antibody may be labeled. By attaching such a label, the diagnostic method of the present invention can be efficiently carried out.
- the present invention provides an antigen-presenting cell that presents the eEF2-specific CTL, eEF2 peptide via an HLA-A * 2402 molecule or an HLA-A * 0201 molecule, or an HLA-A * 2402-restricted eEF2 peptide.
- the present invention relates to a kit for diagnosing cancer comprising an antibody against HLA-A * 0201 restricted eEF2 peptide or an antibody against a polynucleotide encoding the peptide as an essential component.
- the present invention in a further aspect, is a method for determining the presence or amount of eEF2-specific CTL in an HLA-A * 2402 positive subject or an HLA-A * 0201 positive subject comprising: (A) reacting a complex of eEF2 peptide with HLA-A * 2402 molecule or HLA-A * 0201 molecule with the subject-derived sample; (B) examining the presence or amount of CTL that recognizes the complex contained in the sample;
- the present invention relates to a method including steps.
- the subject-derived sample may be any sample as long as it may contain lymphocytes, and examples thereof include body fluids such as blood and lymph, and tissues.
- the complex of the eEF2 peptide and the HLA-A * 2402 molecule or HLA-A * 0201 molecule is made into a form of, for example, a tetramer, a pentamer, etc., using a method known to those skilled in the art such as a biotin streptavidin method. It may be.
- the presence or amount of CTL recognizing such a complex can be measured by methods known to those skilled in the art.
- the complex may be labeled.
- a known label such as a fluorescent label or a radioactive label can be used. Labeling makes it easier and faster to determine the presence or amount of CTL. Using the method of this aspect of the present invention, cancer diagnosis, prognosis, and the like are possible.
- the present invention also provides an eEF2 peptide and an HLA-A * 2402 molecule or HLA-A for determining the presence or amount of eEF2-specific CTL in an HLA-A * 2402 positive subject or an HLA-A * 0201 positive subject.
- an eEF2 peptide and an HLA-A * 2402 molecule or HLA-A for determining the presence or amount of eEF2-specific CTL in an HLA-A * 2402 positive subject or an HLA-A * 0201 positive subject.
- * Provide a composition comprising a complex with 0201 molecules.
- the present invention relates to eEF2-specific CTLs in HLA-A * 2402 positive subjects or HLA-A * 0201 positive subjects comprising a complex of an eEF2 peptide and an HLA-A * 2402 molecule or HLA-A * 0201 molecule.
- a kit for determining the presence or amount is provided.
- the present invention provides a method for obtaining eEF2-specific CTL using a complex of an eEF2 peptide and an HLA-A * 2402 molecule or an HLA-A * 0201 molecule, (A) reacting the sample with the complex; (B) obtaining a CTL that recognizes the complex contained in the sample;
- the present invention relates to a method including steps.
- the complex of eEF2 peptide and HLA-A * 2402 molecule or HLA-A * 0201 molecule is as described above.
- the sample may be any sample as long as it may contain lymphocytes, and examples thereof include a subject-derived sample such as blood, a cell culture solution, and the like. Acquisition of a CTL that recognizes the complex can be performed using methods known to those skilled in the art, such as FACS and MACS.
- the obtained eEF2-specific CTL can be cultured and used for treatment or prevention of various cancers.
- the present invention also relates to an eEF2-specific CTL that can be obtained by a method of obtaining an eEF2-specific CTL using a complex of an eEF2 peptide and an HLA-A * 2402 molecule or an HLA-A * 0201 molecule. It is.
- the present invention relates to a kit for obtaining eEF2-specific CTL comprising a complex of an eEF2 peptide and an HLA-A * 2402 molecule or an HLA-A * 0201 molecule.
- the present invention provides a kit for tumor formation characterized by expressing an eEF2 polypeptide. That is, the kit of the present invention is required to express an eEF2 polypeptide in cells or non-human animals. For this reason, the polynucleotide which codes the amino acid sequence of this polypeptide, or the vector incorporating this is an essential component.
- the non-human animal in this specification refers to animals other than a human.
- the kit of the present invention is based on the finding that forced expression of eEF2 protein promotes the G2 / M phase in the cell cycle.
- the kit of the present invention may contain, for example, means for introducing the polynucleotide or vector into cells or non-human animal tissues, introduction reagents, reaction containers, and the like.
- an instruction manual is attached to the kit.
- the method of the present invention may be performed in vivo or in vitro.
- FIG. 1 is a representative example of Western blot. Then, after separating this protein, it was identified as eEF2 by mass spectrometry.
- eEF2 antibody in various cancers From 72 patients with non-small cell lung cancer, 42 patients with colorectal cancer, 20 patients with squamous cell carcinoma of the head and neck, 18 patients with glioblastoma, and 17 healthy individuals Peripheral blood was obtained with consent. After coagulation, serum was obtained by centrifugation. A recombinant protein expression vector pGEX-5X-3 (GE) into which a gene sequence encoding the amino acid sequence at positions 411 to 858 of eEF2 was inserted was prepared. The purified recombinant GST-eEF2 411-858 protein was adjusted to 150 ng / lane and subjected to SDS-PAGE. This was electrotransferred to a PVDF membrane.
- GEX-5X-3 pGEX-5X-3
- stage I stage II, 13 stage III
- stage III stage III
- the eEF2 antibody titer was determined by the dot blot method.
- the positive rate of eEF2IgG antibody in each stage of non-small cell lung cancer was found to be a high value from stage I (Table 9).
- shEF2 a vector (hereinafter referred to as shEF2) expressing siRNA targeting the 5′-caugggcaacaucaugaucgauccuguccu-3 ′ sequence of eEF2 mRNA was expressed as a tRNA-shRNA expression vector, piGEN tRNA Pur (Clontech, Palo Alto, CA).
- 10 ⁇ g of shEF2 or empty shRNA vector (shMock) was added to gastric cancer cell lines AZ-521 and MKN28, colon cancer cell line SW620, lung cancer cell lines LU99B and PC-14, pancreatic cancer cell lines MiaPaCa2 and PCI6, which express eEF2.
- eEF2 Peptide Selection of four kinds of peptides is performed by selecting a sequence capable of binding to the HLA-A * 2402 molecule in the amino acid sequence of the eEF2 protein (http://www.imtech.res.in predicted using / raghava / propred1 /). The results are shown in Table 10 below. (Table 10. Candidate eEF2 peptides with high binding affinity to HLA-A * 2402 molecule, selected using various programs (NetMHC3.0, Rankpep and SYFPEITHI)) The starting residue number is the number shown in SEQ ID NO: 1. All candidate eEF2 peptides consist of 9 amino acid residues. For example, the peptide having the starting residue number 786 is a peptide consisting of 9 amino acid residues from the 786th residue A to the 794th residue F of SEQ ID NO: 1.
- T2-2402 cells (1 ⁇ 10 6 cells) forcibly expressing human HLA-A * 2402 molecules that do not have the ability to present antigen to HLA molecules, containing 10 ⁇ M synthetic peptide, After incubation at 27 ° C. for 16 hours in RPMI 1640 medium without it, it was left at 37 ° C. for 3 hours.
- T cells pulsed with eEF2 peptides eEF2 409-417 , eEF2 412-420 and eEF2 701-709 peptides
- T2 cells expressing HLA-A * 2402 molecule and brefeldin A Sigma
- cell surface antigens CD3 and CD8 molecules were stained on ice for 15 minutes with PerCP-conjugated anti-CD3 (BD Biosciences) and PE-conjugated anti-CD8 (Caltag, Burlingame, Calif.) Antibodies.
- the cells were fixed on ice for 20 minutes using Cytofix (BD Biosciences), and IFN- ⁇ in the cells was reacted with FITC-conjugated anti-IFN- ⁇ antibody (BD Biosciences) for 30 minutes on ice. Analysis was performed using a flow cytometer, and the frequency of IFN- ⁇ positive cells in the CD8 positive T cells was analyzed. As a result, it was found that the eEF2 409-417 , eEF2 412-420 and eEF2 701-709 peptides increased interferon ⁇ activity, and thus were HLA-A * 2402-restricted peptides (FIG. 30).
- binding affinity of the modified eEF2 peptide to the HLA-A * 2402 molecule Further, among the peptides described above, the amino acid sequence in the peptides of eEF2 786-794 (SEQ ID NO: 7) and eEF2 409-417 (SEQ ID NO: 4) As described above, the binding affinity was also predicted for the modified eEF2 peptide in which the second position (hereinafter also referred to as P2) and / or the ninth position (hereinafter also referred to as P9) was changed to another amino acid. Table 12. Prediction of binding affinity to the HLA-A * 2402 molecule for modified versions of the eEF2 786-794 peptide (SEQ ID NOs: 25 and 26) (Table 13.
- CD4 + CD25 + Treg cells were removed from peripheral blood mononuclear cells obtained from donors with HLA-A * 2402 molecules using CD25 MicroBeads (Miltenyi Biotech, Auburn, CA). Donor monocytes were then isolated using the BD Imag CD14 isolation kit (BD Bioscience) and included X-VIVO15 (Bio Whittaker, Walkersville, Walkersville, IL-4 and GM-CSF supplemented with 1% human AB serum). The following day, IL-1 ⁇ , IL-6, TNF- ⁇ and PGE-2 were added for dendritic cell maturation and cultured for an additional 3 days.
- the peptides were cultured in a medium containing 10 ⁇ g / mL for 2 hours, and after dendritic cells were pulsed with the peptides, mononuclear cells (2 ⁇ 10 6 cells) from which Treg cells were removed were obtained. Co-cultured with peptide-pulsed dendritic cells at a ratio of 10: 1, stimulated with peptides, and IL-2 was added to the medium the next day.
- T2-2402 cells pulsed with eEF2 786-794 peptide as target cells and T2-2402 cells not pulsed with eEF2 786-794 peptide were used as negative controls. This showed that the% specific lysis of T2-2402 cells pulsed with eEF2 786-794 peptide increased significantly with the E / T ratio (FIG. 9).
- Gastric cancer AZ-521 cells and pancreatic cancer MiaPaCa2 cells without -A * 2402 expression were used. As a result, it was shown that cytotoxic T cells activated with eEF2 786-794 peptide specifically damage cells expressing eEF2 and having HLA-A * 2402 molecule (FIG. 10). .
- eEF2 Peptide Selection involves selecting a sequence that can bind to the HLA-A * 0201 molecule in the amino acid sequence of the eEF2 protein from the ProPred-I website (http://www.imtech.res.in/raghava/propred1/ ) (Tables 1 to 7).
- the ability to bind to the HLA-A0201 molecule was actually analyzed by MHC stabilization assay. Briefly, T2-0201 cells (1 ⁇ 10 6 cells) forcibly expressing human HLA-A * 0201 molecules, which do not have the ability to present antigen to HLA molecules, contain 10 ⁇ M synthetic peptide, After incubation at 27 ° C.
- HLA-A * 0201 molecule Since the expression on the cell surface of the HLA-A * 0201 molecule is stabilized by the binding of the peptide, the expression of the HLA-A0201 molecule on the cell surface is analyzed by flow cytometry after treatment with each peptide. Was evaluated for its ability to bind to HLA-A0201 molecules.
- T cell interferon activity were incubated HLA-A * 0201 pulsed with restricted eEF2 peptide HLA-A * 0201 molecule expressing T2 cells and brefeldin A (Sigma) 5 hours at 37 ° C. in the presence. After washing with PBS, the cell surface antigens CD3 and CD8 molecules were stained on ice for 15 minutes with PerCP-conjugated anti-CD3 (BD Biosciences) and PE-conjugated anti-CD8 (Caltag, Burlingame, Calif.) Antibodies.
- PerCP-conjugated anti-CD3 BD Biosciences
- PE-conjugated anti-CD8 Caltag, Burlingame, Calif.
- the above six peptides (eEF2 739-747 (SEQ ID NO: 8), eEF2 519-527 (SEQ ID NO: 9), eEF2 671-679 (SEQ ID NO: 10), eEF2 661-669 (SEQ ID NO: 8) 11), eEF2 394-402 (SEQ ID NO: 12) and eEF2 284-292 (SEQ ID NO: 13) were found to bind to HLA-A * 0201 molecules and have cytotoxic activity.
- binding affinity of the modified eEF2 peptide to the HLA-A * 0201 molecule Next, the above six peptides (eEF2 739-747 , eEF2 519-527 , eEF2 671-679 , eEF2 661-669 , eEF2 394-402 and eEF2) 284-292 ), and eEF2 292-300 peptide (SEQ ID NO: 14), the modified eEF2 peptide in which the amino acid at position 2 and / or the amino acid at position 9 is changed to another amino acid is also used as described above.
- the binding affinity was predicted (Tables 15 to 21).
- modified peptides SEQ ID NOs: 15 to 17 and 24 of eEF2 292-300 (SEQ ID NO: 14) are converted into actual HLA-A * 0201 molecules using the method described above.
- the binding affinities Table 22
- cytotoxicity FIGS. 22-25
- interferon ⁇ activity FIG. 26
- eEF2 292-300 2L (a peptide in which the second amino acid in the eEF2 292-300 peptide is modified from I to L, SEQ ID NO: 15)
- eEF2 292 -300 2M (a peptide in which the second amino acid in the eEF2 292-300 peptide is modified from I to L, SEQ ID NO: 16)
- eEF2 292-300 2L9L (the second amino acid in the eEF2 292-300 peptide) Is a peptide in which the amino acid at position 9 is modified from V to L, SEQ ID NO: 17) and eEF2 292-300 2M9L (in the eEF2 292-300 peptide, the amino acid at position 2 is from I to M
- a peptide in which the amino acid at position 9 is modified from V to L, SEQ ID NO: 24 It was found that the binding to HLA-A * 0201 molecule
- EEF2 forced expression in a cancer cell line A cell clone was established in which an eEF2 expression vector or an empty expression vector was expressed in a gastric cancer cell line AZ-521.
- the eEF2 expression vector is obtained by inserting the nucleotide sequence of the eEF2 gene into the restriction enzyme cleavage site EcoRI of pcDNA3.1 (+) (Invitrogen). These cells were cultured without being synchronized, and the doubling time of the cells was calculated from the number of cells 48 hours and 72 hours after the start of the culture.
- FIG. 15 shows a representative example.
- the tumor on the left is AZ-521 cells expressing an empty vector
- the tumor on the right is AZ-521 cells forcibly expressing eEF2.
- shEF2 shRNA targeting eEF2
- shEF-1918 and shEF-2804 Two sequences (hereinafter referred to as shEF-1918 and shEF-2804) that can be targeted were selected.
- Target sequence of positions 1918 to 1947 of the eEF2 gene (positions 1918 to 1947 from the 5 ′ end of the DNA sequence encoding the eEF2 protein): 5′-gcc tggccgagga catcgataaa ggcgagg-3 ′ (SEQ ID NO: 18)
- Target sequence of positions 2804 to 2833 of the eEF2 gene (positions 2804 to 2833 from the 5 ′ end of the DNA sequence encoding the eEF2 protein): 5′-actcaac cataacactt gatgccgttt ct-3 ′ (SEQ ID NO: 19)
- shRNA Construction To construct shRNA against the above sequences (SEQ ID NOs: 18 and 19), sense the target sequence at the SacI and KpnI recognition sites of the tRNA-shRNA expression vector, piGENe tRNA Pur (Clontech, Palo Alto, Calif.).
- DNA sequence (shEF-1918 or shEF-2804 (sense strand)) consisting of sequence (30 bases) -loop sequence (10 bases) -antisense sequence (30 bases) and its complementary DNA sequence (shEF-1918 or shEF- 2804 (antisense strand)) was chemically synthesized and then annealed and inserted. Such an inserted DNA sequence is shown below.
- shRNA Lung cancer cell PC-14 pancreatic cancer cell PCI6, fibrosarcoma cell HT-1080 and malignant glioma cell A172 were cultured in DMEM 10% FBS.
- cells (1 ⁇ 10 5 cells) were washed twice with PBS, suspended in 250 ⁇ L of FBS-free RPMI1640 medium, and dissolved in 50 ⁇ L of FBS-free RPMI1640 medium.
- An shRNA vector for 1918, shEF-2804, or Luciferase, shLuc was added, respectively, and electroporation was performed using Gene Pulser II (BioRad) under conditions of 950 ⁇ FD and 175 V. The cell viability in this condition is about 90%.
- shEF-1918 and shEF-2804 significantly suppressed their proliferation compared to shLuc in all four analyzed cells (FIG. 27).
- SEQ ID NO: 2 eEF2 siRNA
- SEQ ID NO: 3 eEF2 siRNA
- SEQ ID NO: 18 eEF2 1918-1947
- SEQ ID NO: 19 eEF2 2804-2833
- SEQ ID NO: 20 shEF-1918 sense
- SEQ ID NO: 21 shEF-1918 antisense
- SEQ ID NO: 22 shEF-2804 sense
- SEQ ID NO: 23 shEF-2804 antisense
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Abstract
Description
Nygard O, Nilsson L. Kinetic determination of the effects of ADP-ribosylation on the interaction of eukaryotic elongation factor 2 with ribosomes. J Biol Chem. 1990; 265:6030-4
(1)対象の癌を検出する方法であって、該対象から得られた試料においてeEF2ポリペプチド、eEF2抗体またはeEF2遺伝子の転写物の存在または量を調べる工程を含む方法、
(2)前記癌が、肺腺癌、非小細胞性肺癌、小細胞性肺癌、頭頸部扁平上皮癌、食道癌、食道扁平上皮癌、胃癌、大腸癌、膵管癌、神経膠芽腫、および悪性リンパ腫からなる群から選択される、(1)記載の方法、
(3)癌細胞の増殖を阻害する二本鎖siRNAであって、センス鎖が配列番号:2に示されるRNA配列からなり、アンチセンス鎖が配列番号:3に示されるRNA配列からなる、二本鎖siRNA、
(4)前記癌細胞が、胃癌、肺癌、膵癌、神経膠芽腫および悪性リンパ腫からなる群から選択される癌に由来する、(3)記載の二本鎖siRNA、
(5)有効成分として(3)または(4)記載の二本鎖siRNAを含む、癌を治療または予防するための医薬組成物、
(6)有効量の請求項5記載の医薬組成物を対象に投与することを特徴とする、癌を治療または予防するための方法、
(7)癌を治療または予防するための医薬の製造のための、(3)または(4)記載の二本鎖siRNAの使用、
(8)癌細胞の増殖を阻害するshRNAであって、配列番号:18または19に示すDNA配列から転写されるmRNAを標的とする、shRNA、
(9)(8)記載のshRNAが転写される核酸であって、配列番号:20または22に示すDNA配列を有する核酸、
(10)(9)記載の核酸を含むベクター、
(11)(8)記載のshRNA、(9)記載の核酸または(10)記載のベクターを含む、癌を治療または予防するための医薬組成物、
(12)有効量の(11)記載の医薬組成物を対象に投与することを特徴とする、癌を治療または予防するための方法、
(13)癌を治療または予防するための医薬の製造のための、(8)記載のshRNA、(9)記載の核酸または(10)記載のベクターの使用、
(14)eEF2タンパク質由来の連続するアミノ酸からなるアミノ酸配列を有するeEF2ペプチドであって、前記アミノ酸配列が、
(a)Arg Phe Tyr Ala Phe Gly Arg Val Phe(配列番号:4);
(b)Ala Phe Gly Arg Val Phe Ser Gly Leu(配列番号:5);
(c)Arg Phe Asp Val His Asp Val Thr Leu(配列番号:6);
(d)Ala Tyr Leu Pro Val Asn Glu Ser Phe(配列番号:7);ならびに
(e)(a)~(d)に示すアミノ酸配列において、1個もしくは数個のアミノ酸が、置換、または欠失もしくは付加されたアミノ酸配列
からなる群から選択されるものであるeEF2ペプチドを含む、HLA-A*2402陽性対象の癌を治療または予防するための医薬組成物、
(15)アミノ酸配列が、Ala Tyr Leu Pro Val Asn Glu Ser Phe(配列番号:7)である、(14)記載の医薬組成物、
(16)(14)記載のペプチドをコードするポリヌクレオチドを含む、対象の癌を治療または予防するための医薬組成物、
(17)前記癌が、肺腺癌、小細胞性肺癌、食道癌、胃癌、大腸癌、膵管癌、悪性神経膠芽腫、悪性リンパ腫および頭頸部扁平上皮癌からなる群から選択されるものである、(14)~(16)のうちのいずれか1つ記載の医薬組成物、
(18)有効量の(14)~(17)のいずれか1つ記載の医薬組成物を、HLA-A*2402陽性対象に投与することを特徴とする、癌を治療または予防するための方法、
(19)癌を治療または予防するための医薬を製造するための、(14)記載のペプチドの使用、
(20)eEF2タンパク質由来の連続するアミノ酸からなるアミノ酸配列を有するeEF2ペプチドであって、前記アミノ酸配列が、
(a)Arg Leu Met Glu Pro Ile Tyr Leu Val(配列番号:8);
(b)Lys Leu Val Glu Gly Leu Lys Arg Leu(配列番号:9);
(c)Tyr Leu Asn Glu Ile Lys Asp Ser Val(配列番号:10);
(d)Ile Leu Thr Asp Ile Thr Lys Gly Val(配列番号:11);
(e)Leu Met Met Tyr Ile Ser Lys Met Val(配列番号:12);
(f)Lys Leu Pro Arg Thr Phe Cys Gln Leu(配列番号:13);
(g)Leu Ile Leu Asp Pro Ile Phe Lys Val(配列番号:14);ならびに
(h)(a)~(g)に示すアミノ酸配列において、1個もしくは数個のアミノ酸が、置換、または欠失もしくは付加されたアミノ酸配列
からなる群から選択されるものであるeEF2ペプチドを含む、HLA-A*0201陽性対象の癌を治療または予防するための医薬組成物、
(21)アミノ酸配列が、Arg Leu Met Glu Pro Ile Tyr Leu Val(配列番号:8)またはIle Leu Thr Asp Ile Thr Lys Gly Val(配列番号:11)である、(20)記載の医薬組成物、
(22)アミノ酸配列が、Leu Ile Leu Asp Pro Ile Phe Lys Val(配列番号:14)において、第2位アミノ酸IleをLeuまたはMetに置換し、および/または第9位アミノ酸ValをLeuに置換したものである、(20)記載の医薬組成物、
(23)(20)記載のペプチドをコードするポリヌクレオチドを含む、対象の癌を治療または予防するための医薬組成物、
(24)前記癌が、肺腺癌、小細胞性肺癌、食道癌、胃癌、大腸癌、膵管癌、悪性神経膠芽腫、悪性リンパ腫および頭頸部扁平上皮癌からなる群から選択されるものである、(20)~(23)のうちのいずれか1つ記載の医薬組成物、
(25)有効量の(20)~(24)のいずれか1つ記載の医薬組成物を、対象に投与することを特徴とする、癌を治療または予防するための方法、
(26)癌を治療または予防するための医薬を製造するための、(20)記載のペプチドの使用、
を提供するものである。
本発明のsiRNAのセンス鎖(配列番号:2);
5’-CAUGGGCAACAUCAUGAUCGAUCCUGUCCU-3’
本発明のsiRNAのアンチセンス鎖(配列番号:3);
5’-AGGACAGGAUCGAUCAUGAUGUUGCCCAUG-3’
5’-gcc tggccgagga catcgataaa ggcgagg-3’(配列番号:18):あるいは
5’-actcaac cataacactt gatgccgttt ctt-3’(配列番号:19)
から転写されたmRNAを標的とするshRNAまたはsiRNAを挙げることができる。本発明のshRNAは、上記DNA配列のセンス配列-ループ配列-アンチセンス配列からなるDNA配列を含むベクターから転写されるものであってもよい。かかるDNA配列を含むベクターからRNAに転写されると、センス配列およびアンチセンス配列に由来するRNAが結合して短いヘアピン(short hairpin)RNAを形成し、安定化する。なお、本発明で使用されるループ配列は如何なる配列でもよく、当業者が適宜選択することが可能である。本発明の好ましいsiRNAの例として、5’-gcc tggccgagga catcgataaa ggcgagg-3’(配列番号:18):あるいは5’-actcaac cataacactt gatgccgttt ctt-3’(配列番号:19)から転写されたmRNAとハイブリダイズ可能なsiRNAを挙げることができる。本発明のより具体的なsiRNAの例として、5’-gcc tggccgagga catcgataaa ggcgagg-3’(配列番号:18):あるいは5’-actcaac cataacactt gatgccgttt ctt-3’(配列番号:19)から転写されたmRNAと相補的な配列を有するsiRNAを挙げることができる。あるいは、本発明のsiRNAは、配列番号:18または19に示すDNA配列に対応するRNAのセンス鎖およびアンチセンス鎖からなる二本鎖siRNAであってもよい。また、本発明の好ましいshRNAの例として、5’-gcc tggccgagga catcgataaa ggcgagg-3’(配列番号:18)から転写されたmRNAにハイブリダイズ可能なRNAおよび当該RNAにハイブリダイズ可能なRNAを含むshRNAを挙げることができる。さらに、本発明の好ましいshRNAの例として、5’-actcaac cataacactt gatgccgttt ctt-3’(配列番号:19)から転写されたmRNAにハイブリダイズ可能なRNAおよび当該RNAにハイブリダイズ可能なRNAを含むshRNAを挙げることができる。本発明のshRNAのより具体的な例として、以下のDNA配列:
5’-gcc tggccgagga catcgatgaa agcgtgg cttcctgtca cctcgcc tttatcgatg tcctcggcca ggc-3’(配列番号:20);
5’-actcaac cataacactt gataccattt gtt cttcctgtca aag aaacggcatc aagtgttatg gttgagt-3’(配列番号:22);
3’-cgg accggctcct gtagctactt tcgcacc gaaggacagt ggagcgg aaatagctac aggagccggt ccg-5’(配列番号:21);あるいは
3’-tgagttg gtattgtgaa ctatggtaaa caa gaaggacagt ttc tttgccgtag ttcacaatac caactca-5’(配列番号:23)
を有する核酸から転写されたものである。本発明は、上記DNA配列またはRNA配列において、1個、2個、または3個の塩基が付加、欠失、置換されていてもよく、あるいは、上記DNA配列またはRNA配列に対して、90%以上、好ましくは95%以上、さらに好ましくは95、96、97、98または99%以上の配列相同性を有するものであってもよい。なお、相同性、ハイブリダイズの条件、siRNAの長さについては上述の通りである。また、本発明は、上記DNA配列またはRNA配列において、1個、2個、または3個の塩基が付加、欠失、置換および/または挿入されていてもよい。
(a)試料とeEF2タンパク質のアミノ酸配列(配列番号:1)をコードするヌクレオチド配列もしくはその部分配列を有する核酸または上記eEF2ペプチドを反応させ、
(b)該試料中に含まれるeEF2ペプチドをHLA-A*2402分子またはHLA-A*0201分子を介して提示する抗原提示細胞を得、
(c)前記抗原提示細胞をHLA-A*2402陽性対象またはHLA-A*0201陽性対象に投与する
工程を含む方法に関するものである。上記方法における試料は、リンパ球または樹状細胞が含まれている可能性があればいずれのものであってもよく、例えば、血液などの対象由来試料、細胞培養液などが挙げられる。上記方法における反応は、一般的な手法を用いて行われてよく、好ましくは、エレクトロポレーションを用いて行われる。抗原提示細胞の取得は、当業者に既知の方法を用いて行うことができる。各工程における試料中の細胞の培養条件は、当業者が適宜決定することができる。抗原提示細胞の投与方法は、上述の如くであってもよい。
(a)eEF2ペプチドとHLA-A*2402分子またはHLA-A*0201分子との複合体を該対象由来試料と反応させ;次に、
(b)該試料に含まれる該複合体を認識するCTLの存在または量を調べる、
工程を含む方法に関するものである。対象由来試料は、リンパ球が含まれている可能性があればいずれのものであってもよく、例えば、血液、リンパ液などの体液、組織などが挙げられる。eEF2ペプチドとHLA-A*2402分子またはHLA-A*0201分子との複合体は、例えば、ビオチンストレプトアビジン法などの当業者に既知の方法を用いて、例えば、テトラマー、ペンタマーなどの形態にされていてもよい。かかる複合体を認識するCTLの存在または量は、当業者に既知の方法により測定することができる。本発明のこの態様において、上記複合体は標識されたものであってもよい。標識としては、蛍光標識、放射性標識などの公知のものを使用することができる。標識することで、CTLの存在または量の決定が容易かつ迅速になる。本発明のこの態様の方法を用いて、癌の診断、予後診断などが可能になる。
(a)試料と複合体を反応させ、
(b)該試料中に含まれる該複合体を認識するCTLを得る、
工程を含む方法に関するものである。eEF2ペプチドとHLA-A*2402分子またはHLA-A*0201分子との複合体については上述の通りである。試料は、リンパ球が含まれている可能性があればいずれのものであってもよく、例えば、血液などの対象由来試料、細胞培養液などが挙げられる。複合体を認識するCTLの取得は、例えば、FACS、MACSなど当業者に既知の方法を用いて行うことができる。得られたeEF2特異的CTLを培養し、種々の癌の治療または予防に用いることも可能になる。
肺癌細胞株PC14およびLU-99B、白血病細胞株K562細胞をSDS-sample bufferに溶解した。これらに含まれるタンパク質をSDS-PAGEにより分離後、PVDFメンブレンに転写し、肺癌患者10名および健常者10名より得られた血清を1500:1に希釈したものを一次抗体として使用し、メンブレンに結合したIgG抗体を抗ヒトIgG抗体を用いて可視化した。その結果、肺癌患者血清より特異的に認識される約100kDaのタンパク質を見出した(図1)。図1はウェスタンブロットの代表例である。その後、このタンパク質を分離後、質量分析の手法によりeEF2であると同定した。
パラフィン包埋ブロックより薄切切片を準備した。脱パラフィン処理後、クエン酸バッファー(pH6.0)中で抗原賦活処理を行い、抗-eEF2抗体(H-118, Santa Cruz Biotechnology, Santa Cruz, CA、1:100希釈)と4℃で一晩反応後、Envision kit/HRP(Dako Cytomation)と室温で30分間反応させた。0.7% H2O2溶液と反応させた後、DABを基質として発色させ、その後ヘマトキシリンにより核染色を行った。その結果、肺腺癌、小細胞性肺癌、頭頚部扁平上皮癌、食道癌、胃癌および結腸癌患者のそれぞれの患部組織において、抗体陽性細胞が観察された(図2~4)。
非小細胞肺癌の患者72名、大腸癌の患者42名、頭頚部扁平上皮癌の患者20名、神経膠芽腫の患者18名、および健常者17名より同意のもと末梢血を得た。これを凝固させた後、遠心分離により血清を得た。eEF2の第411-858位のアミノ酸配列をコードする遺伝子配列を挿入した組み換えタンパク質発現用のベクターpGEX-5X-3(GE)を作成した。精製した組み換えGST-eEF2411-858タンパク質を150ng/レーンとなるよう調整し、SDS-PAGEを行った。これをPVDFメンブレンに電気転写を行った。これと1500:1に希釈した血清を室温で一晩反応させ、メンブレンに結合したIgG抗体を抗ヒトIgG抗体を用いて可視化した。このバンドの密度を測定し、抗eEF2抗体価とした。健常者17名の抗体価の中央値は500densitometric unitsで標準偏差は500であったので、カットオフレベルをmedian+3SDである2000densitometric unitsとした。その結果、特異度94.7%でeEF2 IgG抗体は非小細胞肺癌では66.7%、大腸癌では71.8%、頭頚部扁平上皮癌では60.0%、神経膠芽腫では88.9%で陽性であった(図5)。各種癌におけるeEF2タンパク質の発現を免疫染色法により解析した。対応する正常細胞に比較して強い染色を示す癌細胞が、癌細胞全体の25%以上である場合に陽性と判定した(表8)。
血清CEA値の明らかである非小細胞肺癌の患者70名(I期44名、II期13名、III期13名)においてeEF2抗体価の陽性率とCEAの陽性率を比較した。ここで、I期、II期、III期の分類は、国際対癌連合により定められたTNM分類に従って行った。eEF2抗体価はドットブロット法により決定した。その結果、非小細胞肺癌の各病期におけるeEF2IgG抗体の陽性率は、ステージI期から高い値であることがわかった(表9)。
非小細胞肺癌におけるeEF2抗体価と無病生存率の関連について解析した。44名の患者のうちeEF2抗体価が4000densitometric units以上であった群(11名)では、eEF2抗体価が2000ないし4000densitometric unitsであった群(26名)や2000densitometric units未満であった群(7名)と比較して、有意に無病生存率が高かった(log rank検定、図6)。
eEF2mRNAの5’-caugggcaacaucaugaucgauccuguccu-3’配列を標的とするsiRNAを発現するベクター(以下、shEF2という)を、tRNA-shRNA発現ベクター、piGENE tRNA Pur(Clontech , Palo Alto, CA)を用いて作成した。次に、shEF2または空のshRNAベクター(shMock)10μgを、eEF2を発現する胃癌細胞株AZ-521およびMKN28、大腸癌細胞株SW620、肺癌細胞株LU99BおよびPC-14、膵癌細胞株MiaPaCa2およびPCI6、神経膠芽腫細胞株A172およびU87MG、ならびに悪性リンパ腫細胞株IB4およびYT(各5x105個)にGene Pulser Xcell(登録商標)system(Bio Rad, Hercules, CA)を用いて、165V、1000μFの条件でエレクトロポレーションにより導入した。導入後24、48、72および96時間後、細胞をトリプシン処理し、生存細胞数を算定した。実験はduplicateで3回独立に行った。いずれにおいてもshEF2は有意に細胞増殖を抑制した(図7および図8)。
まず、4種のペプチドの選択は、eEF2タンパク質のアミノ酸配列中のHLA-A*2402分子に結合しうる配列をProPred-Iウェブサイト(http://www.imtech.res.in/raghava/propred1/)を用いて予測した。その結果を以下の表10に示す。
(表10.各種プログラム(NetMHC3.0、RankpepおよびSYFPEITHI)を用いて選択した、HLA-A*2402分子への高い結合親和性を有する候補eEF2ペプチド)
T細胞をeEF2ペプチド(eEF2409-417、eEF2412-420およびeEF2701-709ペプチド)でパルスしたHLA-A*2402分子発現T2細胞とbrefeldin A(Sigma)存在下にて37℃で5時間インキュベートした。PBSで洗浄後、PerCP抱合抗CD3(BD Biosciences)およびPE抱合抗CD8(Caltag, Burlingame, CA)抗体により細胞表面抗原であるCD3およびCD8分子を氷上で15分間染色した。次にCytofix(BD Biosciences)を用いて細胞を氷上で20分間固定し、細胞内のIFN-γをFITC抱合抗IFN-γ抗体(BD Biosciences)により氷上で30分間反応させた。フローサイトメーターを用いて解析し、CD8陽性T細胞の中に占めるIFN-γ陽性細胞の頻度を解析した。この結果、eEF2409-417、eEF2412-420およびeEF2701-709ペプチドはインターフェロンγ活性を上昇させ、よってHLA-A*2402拘束性ペプチドであることがわかった(図30)。
さらに、上記ペプチドのうち、eEF2786-794(配列番号:7)およびeEF2409-417(配列番号:4)のペプチドにおいて、アミノ酸配列の第2位(以下、P2ともいう)および/または第9位(以下、P9ともいう)を別のアミノ酸に改変した改変型eEF2ペプチドについても、上述のごとく結合親和性を予測した。
(表12.eEF2786-794ペプチドの改変型(配列番号:25および26)に関するHLA-A*2402分子への結合親和性の予測)
HLA-A*2402分子を持つドナーから得られた末梢血単核球からCD4+CD25+ Treg細胞をCD25 MicroBeads(Miltenyi Biotech, Auburn, CA)を用いて除去した。次にドナーの単球をBD IMag CD14 isolation kit(BD Bioscience)を用いて単離し、IL-4およびGM-CSFを含み、1%ヒトAB血清が補充されたX-VIVO15(Bio Whittaker, Walkersville, MD)中で培養し、翌日、IL-1β、IL-6、TNF-αおよびPGE-2を樹状細胞の成熟のために添加し、さらに3日間培養した。樹状細胞に放射線(30G)照射した後、ペプチドを10μg/mL含有培地中で2時間培養し、樹状細胞をペプチドでパルスした後、Treg細胞を除去した単核球(2x106細胞)をペプチドパルスした樹状細胞と10:1の比で共培養し、ペプチドによる刺激を行い、翌日、IL-2を培地に添加した。その後、10日毎にペプチドパルスした放射線照射ドナー単核球により再刺激を行い、数回刺激を行った後、IL-7およびIL-15を含む培地で培養し、T細胞クローンを樹立した。
上述のごとく樹立したT細胞クローンからCD8陽性T細胞をCD8 Microbeadsを用いて精製し、エフェクター細胞を調製した。次に、標的細胞を51Cr-labeled sodium chromate(Amersham Biosciences Corp., NJ)で1時間インキュベートしてラベルした後、これらをエフェクター細胞と細胞数の比が1:1、3:1および9:1のCTL/標的細胞(E/T)の比で混ぜ、4時間放置した。溶解した細胞の割合は、式:
%特異的溶解=[(cpm experimental release-cpm spontaneous release)/(cpm maximal release-cpm spontaneous release)]x100
で求めた。標的細胞としてeEF2786-794ペプチドをパルスされたT2-2402細胞および陰性コントロールとしてeEF2786-794ペプチド(配列番号:7)でパルスしていないT2-2402細胞を用いた。これにより、eEF2786-794ペプチドでパルスされたT2-2402細胞の%特異的溶解が、E/T比とともに著しく上昇することが示された(図9)。また、標的細胞として、内在性のeEF2発現があり、細胞表面でのHLA-A*2402発現がある大腸癌SW480細胞、ならびに陰性コントロールとして、内在性のeEF2発現があるが、細胞表面でのHLA-A*2402発現がない胃癌AZ-521細胞および膵癌MiaPaCa2細胞を用いた。この結果、eEF2786-794ペプチドで活性化された細胞傷害性T細胞が、eEF2を発現し、かつHLA-A*2402分子を有する細胞を特異的に傷害することが示された(図10)。
ペプチドの選択は、eEF2タンパク質のアミノ酸配列中のHLA-A*0201分子に結合しうる配列をProPred-Iウェブサイト(http://www.imtech.res.in/raghava/propred1/)を用いて予測した(表1~7)。次に、実際に、HLA-A0201分子への結合能をMHC stabilization assayにより解析した。簡単に説明すると、HLA分子への抗原提示能を持たない、ヒトHLA-A*0201分子を強制発現させたT2-0201細胞(1×106個)を、10μMの合成ペプチドを含み、血清を含まないRPMI1640培地において27℃で16時間インキュベートした後、37℃で3時間放置した。HLA-A*0201分子の細胞表面での発現はペプチドの結合により安定化されるので、それぞれのペプチドにより処理後、細胞表面のHLA-A0201分子の発現をフローサイトメトリーで解析し、それぞれのペプチドのHLA-A0201分子への結合能を評価した。その結果、eEF2284-292(配列番号:13)、eEF2394-402(配列番号:12)、eEF2519-527(配列番号:9)、eEF2661-669(配列番号:11)、eEF2671-679(配列番号:10)およびeEF2739-747(配列番号:8)の各々のペプチドがHLA-A*0201分子に対して結合能を示した(表14)。
T細胞をHLA-A*0201拘束性eEF2ペプチドをパルスしたHLA-A*0201分子発現T2細胞とbrefeldin A(Sigma)存在下にて37℃で5時間インキュベートした。PBSで洗浄後、PerCP-conjugated anti-CD3(BD Biosciences)およびPE-conjugated anti-CD8(Caltag, Burlingame, CA)抗体により細胞表面抗原であるCD3およびCD8分子を15分間氷上で染色した。次にCytofix(BD Biosciences)を用いて氷上で20分間細胞を固定し、細胞内のIFN-γをFITC-抱合抗-IFN-γ抗体(BD Biosciences)により氷上で30分間反応させた。フローサイトメーターを用いて解析し、CD8陽性T細胞の中に占めるIFN-γ陽性細胞の頻度を解析した。図11ではeEF2739-747ペプチド、図12ではeEF2661-669ペプチドを用いた。この結果、eEF2661-669(配列番号:11)およびeEF2739-747(配列番号:8)のペプチドがインターフェロンγ活性を上昇させることがわかった(図11および12)。
次いで、上述のごとく選択した6種類の候補ペプチド(eEF2739-747(配列番号:8)、eEF2519-527(配列番号:9)、eEF2671-679(配列番号:10)、eEF2661-669(配列番号:11)、eEF2394-402(配列番号:12)およびeEF2284-292(配列番号:13)であって、eEF2292-300(配列番号:14)は除いた)が実際に細胞傷害活性を有するかどうかを調べた。上記の実施例3とほぼ同様に実験を行った。すなわち、HLA-A*0201分子を保有する健全なドナーから採血し、末梢血単核球を分離し、6種類の候補ペプチドで1回目の刺激を行った(stimulator:自己PBMC)。その後、2日目以降のペプチド刺激を8~13日間隔で行った(stimulator:allo B-LCL 3mg/ml)。さらに、2回目以降2日ごとに最終濃度20IU/mlでIL-2を添加した。最終ペプチド刺激から6日後に細胞傷害性の測定を行った。その結果、上記6種類のペプチドで細胞傷害活性の上昇が見られた(図16~21)。以上より、上記6種類のペプチド(eEF2739-747(配列番号:8)、eEF2519-527(配列番号:9)、eEF2671-679(配列番号:10)、eEF2661-669(配列番号:11)、eEF2394-402(配列番号:12)およびeEF2284-292(配列番号:13)が、HLA-A*0201分子に結合し、かつ細胞傷害性活性を有することがわかった。
次いで、上記6種類のペプチド(eEF2739-747、eEF2519-527、eEF2671-679、eEF2661-669、eEF2394-402およびeEF2284-292)、ならびにeEF2292-300ペプチド(配列番号:14)において、第2位アミノ酸および/または第9位アミノ酸を別のアミノ酸に改変した改変型eEF2ペプチドについても、上述のごとくプログラムを用いて結合親和性を予測した(表15~21)。
胃癌細胞株AZ-521にeEF2発現ベクターまたは空の発現ベクターを発現させた細胞クローンを樹立した。eEF2発現ベクターは、pcDNA3.1(+)(Invitrogen)の制限酵素切断部位EcoRIにeEF2遺伝子のヌクレオチド配列を挿入したものである。これらの細胞を同調させずに培養し、培養開始後48時間および72時間後の細胞数から細胞の倍加時間を計算した。さらに1x105個の細胞を80%エタノールで固定後、細胞をヨウ化プロピジウム(PI、5μg/ml)およびRNaseA(200μg/ml)を含むPBS中で30分間放置し、フローサイトメトリーにより細胞周期のphaseごとの分布を解析した(図13、左上のグラフ)。次に、細胞の倍加時間は細胞周期の長さに相当するので、これと各細胞周期のphaseの分布の割合をかけることにより、各phaseの進行時間を計算した(図13、右上のグラフおよび下の表)。その結果、eEF2を発現させた細胞では、G2/M期の細胞数が減少し、進行時間が短くなることが観察された(図13)。このことは、eEF2がG2/M期の進行を促進することを示唆する。
eEF2を標的として効率的にeEF2の発現を抑制し、癌の増殖を抑制しうるshRNA(以下、shEF2という)を開発するために、新たにeEF2の配列中で標的となりうる2つの配列(以下、shEF-1918およびshEF-2804という)を選択した。
eEF2遺伝子の第1918~1947位(eEF2タンパク質をコードするDNA配列の5’末端から第1918~1947位)の標的配列:
5’-gcc tggccgagga catcgataaa ggcgagg-3’(配列番号:18)
eEF2遺伝子の第2804~2833位の(eEF2タンパク質をコードするDNA配列の5’末端から第2804~2833位)の標的配列:
5’-actcaac cataacactt gatgccgttt ctt-3’(配列番号:19)
上記配列(配列番号:18および19)に対するshRNAを構築するために、tRNA-shRNA発現ベクター、piGENE tRNA Pur(Clontech , Palo Alto, CA)のSacIとKpnIの認識部位に標的配列のセンス配列(30塩基)-ループ配列(10塩基)-アンチセンス配列(30塩基)からなるDNA配列(shEF-1918またはshEF-2804(センス鎖))、およびその相補DNA配列(shEF-1918またはshEF-2804(アンチセンス鎖))を化学合成後、アニールさせ、挿入した。かかる挿入したDNA配列を以下に示す。ここで、配列が転写されたRNAが切断された際にアンチセンス鎖が効率よくRISCに取り込まれるように、標的配列のセンス配列の一部に変異を加えた(以下の配列中、下線で示す)。
・shEF-1918(センス鎖):
5’-(gcc tggccgagga catcgatgaa agcgtgg) cttcctgtca (cctcgcc tttatcgatg tcctcggcca ggc)-3’(配列番号:20)
・shEF-1918(アンチセンス鎖):
3’-(cgg accggctcct gtagctactt tcgcacc) gaaggacagt (ggagcgg aaatagctac aggagccggt ccg)-5’(配列番号:21)
・shEF-2804(センス鎖):
5’-(actcaac cataacactt gataccattt gtt) cttcctgtca (aag aaacggcatc aagtgttatg gttgagt)-3’(配列番号:22)
・shEF-2804(アンチセンス鎖):
3’-(tgagttg gtattgtgaa ctatggtaaa caa) gaaggacagt (ttc tttgccgtag ttcacaatac caactca)-5’(配列番号:23)
肺癌細胞PC-14、膵癌細胞PCI6、線維肉腫細胞HT-1080および悪性神経膠腫細胞A172をDMEM10%FBS中で培養した。ShRNAを導入するために、細胞(1x105個)をPBSで2回洗浄した後、250μLのFBS不含RPMI1640培地中で懸濁し、これに50uLのFBS不含RPMI1640培地で溶解した10ugのshEF-1918、shEF-2804、またはLuciferaseに対するshRNAベクター、shLucをそれぞれ加え、950μFD、175Vの条件下でGene Pulsor II(BioRad)を用いて、エレクトロポレーションを行った。この条件における細胞の生存率は約90%である。shRNAを導入した後、生細胞数を算定し、1x105細胞/mLの密度で細胞を播き、72時間後にトリプシン処理し、細胞数を算定した。その結果、shEF-1918およびshEF-2804は、解析した4つのすべての細胞においてshLucに比較して、有意にその増殖を抑制した(図27)。
SEQ ID NO:3: eEF2 siRNA
SEQ ID NO:18: eEF2 1918-1947
SEQ ID NO:19: eEF2 2804-2833
SEQ ID NO:20: shEF-1918 sense
SEQ ID NO:21: shEF-1918 antisense
SEQ ID NO:22: shEF-2804 sense
SEQ ID NO:23: shEF-2804 antisense
Claims (26)
- 対象の癌を検出する方法であって、該対象から得られた試料においてeEF2ポリペプチド、eEF2抗体またはeEF2遺伝子の転写物の存在または量を調べる工程を含む方法。
- 前記癌が、肺腺癌、非小細胞性肺癌、小細胞性肺癌、頭頸部扁平上皮癌、食道癌、食道扁平上皮癌、胃癌、大腸癌、膵管癌、神経膠芽腫、および悪性リンパ腫からなる群から選択される、請求項1記載の方法。
- 癌細胞の増殖を阻害する二本鎖siRNAであって、センス鎖が配列番号:2に示されるRNA配列からなり、アンチセンス鎖が配列番号:3に示されるRNA配列からなる、二本鎖siRNA。
- 前記癌細胞が、胃癌、肺癌、膵癌、神経膠芽腫および悪性リンパ腫からなる群から選択される癌に由来する、請求項3記載の二本鎖siRNA。
- 有効成分として請求項3または4記載の二本鎖siRNAを含む、癌を治療または予防するための医薬組成物。
- 有効量の請求項5記載の医薬組成物を対象に投与することを特徴とする、癌を治療または予防するための方法。
- 癌を治療または予防するための医薬の製造のための、請求項3または4記載の二本鎖siRNAの使用。
- 癌細胞の増殖を阻害するshRNAであって、配列番号:18または19に示すDNA配列から転写されるmRNAを標的とする、shRNA。
- 請求項8記載のshRNAが転写される核酸であって、配列番号:20または22に示すDNA配列を有する核酸。
- 請求項9記載の核酸を含むベクター。
- 請求項8記載のshRNA、請求項9記載の核酸または請求項10記載のベクターを含む、癌を治療または予防するための医薬組成物。
- 有効量の請求項11記載の医薬組成物を対象に投与することを特徴とする、癌を治療または予防するための方法。
- 癌を治療または予防するための医薬の製造のための、請求項8記載のshRNA、請求項9記載の核酸または請求項10記載のベクターの使用。
- eEF2タンパク質由来の連続するアミノ酸からなるアミノ酸配列を有するeEF2ペプチドであって、前記アミノ酸配列が、
(a)Arg Phe Tyr Ala Phe Gly Arg Val Phe(配列番号:4);
(b)Ala Phe Gly Arg Val Phe Ser Gly Leu(配列番号:5);
(c)Arg Phe Asp Val His Asp Val Thr Leu(配列番号:6);
(d)Ala Tyr Leu Pro Val Asn Glu Ser Phe(配列番号:7);ならびに
(e)(a)~(d)に示すアミノ酸配列において、1個もしくは数個のアミノ酸が、置換、または欠失もしくは付加されたアミノ酸配列
からなる群から選択されるものであるeEF2ペプチドを含む、HLA-A*2402陽性対象の癌を治療または予防するための医薬組成物。 - アミノ酸配列が、Ala Tyr Leu Pro Val Asn Glu Ser Phe(配列番号:7)である、請求項14記載の医薬組成物。
- 請求項14記載のペプチドをコードするポリヌクレオチドを含む、対象の癌を治療または予防するための医薬組成物。
- 前記癌が、肺腺癌、小細胞性肺癌、食道癌、胃癌、大腸癌、膵管癌、悪性神経膠芽腫、悪性リンパ腫および頭頸部扁平上皮癌からなる群から選択されるものである、請求項14~16のうちのいずれか1項記載の医薬組成物。
- 有効量の請求項14~17のいずれか1項記載の医薬組成物を、HLA-A*2402陽性対象に投与することを特徴とする、癌を治療または予防するための方法。
- 癌を治療または予防するための医薬を製造するための、請求項14記載のペプチドの使用。
- eEF2タンパク質由来の連続するアミノ酸からなるアミノ酸配列を有するeEF2ペプチドであって、前記アミノ酸配列が、
(a)Arg Leu Met Glu Pro Ile Tyr Leu Val(配列番号:8);
(b)Lys Leu Val Glu Gly Leu Lys Arg Leu(配列番号:9);
(c)Tyr Leu Asn Glu Ile Lys Asp Ser Val(配列番号:10);
(d)Ile Leu Thr Asp Ile Thr Lys Gly Val(配列番号:11);
(e)Leu Met Met Tyr Ile Ser Lys Met Val(配列番号:12);
(f)Lys Leu Pro Arg Thr Phe Cys Gln Leu(配列番号:13);
(g)Leu Ile Leu Asp Pro Ile Phe Lys Val(配列番号:14);ならびに
(h)(a)~(g)に示すアミノ酸配列において、1個もしくは数個のアミノ酸が、置換、または欠失もしくは付加されたアミノ酸配列
からなる群から選択されるものであるeEF2ペプチドを含む、HLA-A*0201陽性対象の癌を治療または予防するための医薬組成物。 - アミノ酸配列が、Arg Leu Met Glu Pro Ile Tyr Leu Val(配列番号:8)またはIle Leu Thr Asp Ile Thr Lys Gly Val(配列番号:11)である、請求項20記載の医薬組成物。
- アミノ酸配列が、Leu Ile Leu Asp Pro Ile Phe Lys Val(配列番号:14)において、第2位アミノ酸IleをLeuまたはMetに置換し、および/または第9位アミノ酸ValをLeuに置換したものである、請求項20記載の医薬組成物。
- 請求項20記載のペプチドをコードするポリヌクレオチドを含む、対象の癌を治療または予防するための医薬組成物。
- 前記癌が、肺腺癌、小細胞性肺癌、食道癌、胃癌、大腸癌、膵管癌、悪性神経膠芽腫、悪性リンパ腫および頭頸部扁平上皮癌からなる群から選択されるものである、請求項20~23のうちのいずれか1項記載の医薬組成物。
- 有効量の請求項20~24のいずれか1項記載の医薬組成物を、対象に投与することを特徴とする、癌を治療または予防するための方法。
- 癌を治療または予防するための医薬を製造するための、請求項20記載のペプチドの使用。
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US14/838,312 US10383925B2 (en) | 2009-01-08 | 2015-08-27 | Cancer antigen EEF2 |
US14/838,330 US20160051652A1 (en) | 2009-01-08 | 2015-08-27 | Novel cancer antigen eef2 |
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US14/838,330 Division US20160051652A1 (en) | 2009-01-08 | 2015-08-27 | Novel cancer antigen eef2 |
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US11781142B2 (en) * | 2016-11-03 | 2023-10-10 | University Of Florida Research Foundation, Incorporated | AAV delivery of shRNA for treatment of pancreatic cancer |
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