| Project/Area Number |
09671336
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Keio University |
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Principal Investigator |
OZAWA Soji Keio University, School of Medicine, Instructor, 医学部, 助手 (10169287)
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| Co-Investigator(Kenkyū-buntansha) |
SHIH Chih-Horng Tokyo Dental College, Department of Dentistry, Instructor, 歯学部, 助手 (90255472)
TANAKA Masaru Keio University, School of Medicine, Assistant, 医学部, 助手 (40270516)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | esophageal cancer / angiogenesis / VEGF / FGF / target therapy / RNase / flt / ヒト生理活性物質 / タ-ゲ |
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| Research Abstract |
Although many angiogenic inhibitors have been proposed, their side effects often make clinical application difficult. To minimize the side effects, we made a new angiogenic inhibitor which consists of only physiologically active materials. We have fused a pancreatic-type ribonuclease (RNase) gene to human basic fibroblast growth factor (bFGF), and studied the inhibitory effect of the fused protein on angiogenesis and tumor growth in vitro and in vivo. Inhibitory effects on in vitro angiogenesis were evaluated by an assay using fragments of human placental blood vessels (Brown, 1996). in an in vitro study, angiogenesis index calculated in wells with the fused protein was 9 % of the control and the fused protein inhibited angiogenesis dose dependently. In an in vivo study, A43 1 cells were injected into the subcutaneous layer of SCID mice and 1.45 mg of the fused protein was injected around the tumor every day for 3 weeks. The estimated tumor weight in the fused protein injection group was lighter than that in the control group. Effects of the fused protein on tumor growth was also observed. These results suggest that the RNase-FGF fused protein is a candidate for a new angiogenic inhibitor
To evaluate clinicopathological significance of angiogenesis and related peptide, we examined expression of VEGF and counted microvessel density on the sections of esophageal tumors. Both parameters were demonstrated to be useful prognostic markers.
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