| Project/Area Number |
10470263
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Digestive surgery
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| Research Institution | Wakayama Medical University, School of Medicine |
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Principal Investigator |
YAMAUE Hiroki Wakayama Medical University, School of Medicine, Assistant Prof., 医学部, 助教授 (20191190)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMORI Mikihito Wakayama Medical University, School of Medicine, Assistant, 医学部, 助手 (10322372)
IWAHASHI Makoto Wakayama Medical University, School of Medicine, Assistant, 医学部, 助手 (70244738)
TANIMURA Hiroshi Wakayama Medical University, School of Medicine, Prof., 医学部, 教授 (10026990)
角田 卓也 和歌山県立医科大学, 医学部, 助手 (30275359)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
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| Keywords | gastrointestinal cancer / gene therapy / adenoviral vector / immunogene / suicide gene |
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| Research Abstract |
Using a syngeneic murine model, we investigated the therapeutic efficacy of combined gene therapy using adenoviral vectors expressing murine interleukin-2(AdmIL-2)and Escherichia coli cytosine deaminase(AdCD). In a subcutaneous tumor model, tumor-bearing mice were treated with an intratumoral injection of adenoviral vectors and received an intraperitoneal administration of 5-fluorocytosine(5-FC). Only the mice treated with AdCD(2x10^8 pfu)and an intermediate dose of AdmIL-2(1x10^6 pfu)survived significantly longer than mice treated with AdCD alone(p<0.01). Moreover, 40% of these treated mice obtained complete remission from tumor-bearing status. The cytotoxicity of splenocytes obtained from the treated mice was related to the survival period. A cold target competition assay showed that the cell-mediated cytotoxic response was specific for parental tumor cells. In a hepatic metastasis model, mice treated with an intravenous administration of both AdCD(2x10^8 pfu)and an intermediate dose of AdmIL-2(1x10^6 pfu)demonstrated the most significant reduction of metastatic foci and the longest survival following a 5-FC administration. These results suggest that gene therapy combined with AdmIL-2 and AdCD may be a promising strategy for a clinical application and in addition that translation of combined gene therapy from murine models into the clinical setting will require careful attention to the variables of cytokine expression levels in the design of clinical trials and in the evaluation of treatment efficacy.
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