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      • In Vivo Animal Angiogenic Model and Gene Expression Patterns of Angiogenic Factors and Inhibitors in HCC Cell Lines by Hypoxia

        이유미,배수경,이옥희,이새원,김규원 한국생명과학회 1998 한국생명과학회 학술발표회 Vol.20 No.-

        Angiogenesis, the formation of new blood vessels, is essential for the growth of tumor, and is also known to be tightly controlled by the various angiogenic factors and angiogenic inhibitors. As an in vivo method to quantitate angiogenesis, Matrigel with angiogenic factor was injected subcutaneously into C57BL/6 mice. As a result, Matrigel with bFGF markedly induced the many new blood vessels while no blood vessel was appeared in control mice. To investigate the role of hypoxia in balancing system of the angiogenic and antiangiogenic factors during hepatocarcinogeneis, the expression patterns of factors and inhibitors were examined using hepatocellular carcinoma cell lines, HepG2 and Hep3B. VEGF was highly induced by hypoxia in a time dependent manner. interestingly, IGF- II induced the expression of VEGF gene and synergistically increased that of VEGF when cotreated with hypoxia in HepG2 cells. In contrast, the expression of bFGF was not detected in HepG2 cells even in hypoxic condition by northern blot analysis. The tumor suppressor gene, p53 was decreased by the hypoxia in HepG2 cells. Taken together, VEGF and IGF- II are induced while p53 is down-regulated by hypoxia, suggesting that the expression changes of these factors coordinatively participate to form new blood vessels in early tumor mass.

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