| Project/Area Number |
02671023
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Biological pharmacy
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| Research Institution | UNIVERSITY OF SHIZUOKA (1991)
Setsunan University (1990) |
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Principal Investigator |
OKU Naoto University of Shizuoka, School of Pharmaceutical Sciences, Associate professor, 薬学部, 助教授 (10167322)
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| Co-Investigator(Kenkyū-buntansha) |
SHIBAMOTO Sayumi Setsunan University, Faculty of Pharmaceutical Sciences, Research Assistant, 薬学部, 研究員 (80178920)
HAYAKAWA Makio Setsunan University, Faculty of Pharmaceutical Sciences, Research Associate, 薬学部, 助手 (30198824)
HORI Takamitsu Setsunan University, Faculty of Pharmaceutical Sciences, Lecturer, 薬学部, 講師 (00199522)
ITO Fumiaki Setsunan University, Faculty of Pharmaceutical Sciences, Professor, 薬学部, 教授 (80111764)
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| Project Period (FY) |
1990 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Tumor Necrosis Factor / TNF / Cytotoxicity / Cellular Growth / Prostaglandin / G-protein / Signal Transduction |
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| Research Abstract |
Tumor Necrosis Factor (TNF) exerts cytotoxic and cytostatic action against certain tumor cells while sparing normal cells both in vitro and in vivo. TNF is thought to have both growth stimulatory and inhibitory signals. We discovered that human diploid fibroblast FS-4 cells, which growth was stimulated by TNF, generated prostaglandin that suppressed cell growth. By the analysis of prostaglandins, PGE_2 was the main prostaglandin produced in FS-4 cells and the production of this prostaglandin was stimulated by TNF-treatment. Furthermore, when prostaglandin production was enhanced by the addition of arachidonate, TNF acts as cytotoxic factor against FS-4 cells. For elucidating the early event of TNF-signal transduction, TNF receptor was purified by TNF-affinity chromatograpy was examined. TNF receptor was a molecular assembly of 300 kDa, including G-protein. Therefore, TNF-signal might stimulate phospholipase A_2 via G-protein, then released arachidonate might convert to prostaglandins. Next, the involvement of prostaglandins in the cytotoxic action of TNF was examined using TNF-sensitive L929 cells and TNF-resistant sublines. L929 cells generated prostaglandin by the treatment of TNF, whereas TNF-resistant sublines did not. Furthermore the cytotoxic action of TNF on L929 cells was inhibited by the addition of indomethacin, suggesting that prostaglandin may be involved in the cytotoxic action of TNF. These results indicate the involvement of prostaglandinproducing pathway in the cytotoxic action of TNF.
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