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• W2008476451 abstract "Plasminogen kringle 5 (K5), a proteolytic fragment of plasminogen, is an endogenous angiogenic inhibitor. We have previously shown that K5 inhibits ischemia-induced retinal neovascularization in a rat model. However, its anti-angiogenic potential and application in the treatment of neoplastic diseases have not been well investigated. Our present study was designed to test its effect on the neovascularization and growth of hepatocellular carcinoma, a typical hypervascular tumor. Recombinant human K5 was expressed in E. coli and purified by affinity chromatography. K5 inhibited proliferation and induced apoptosis of primary endothelial cells in dose-dependent manner, but no effect on pericytes from the same origin of endothelial cells, which suggested an endothelial cell-specific inhibition. Moreover, K5 had no effect on the proliferation and apoptosis of mouse HepA and human Bel7402 hepatoma cell lines even in the enhanced concentration range, which suggested K5 having no direct effect on tumor cells. Ventral injection of K5 significantly suppressed the tumor growth in graphed hepatocarcinoma mice model, which was established by injection of mouse HepA hepatoma cells. In xenografted hepatocarcinoma athymic mice model, which mimicked human tumors by injection of human Bel7402 hepatoma cells, K5 significantly suppressed the tumor growth. An average of 68% suppression of primary tumor growth was observed in the K5-treated mice compared with control group. K5 also inhibited intratumoral neovascularization in the two cancer models determined by micro vessel density (MVD) analysis. Injection of K5 significantly induced the cleavage of pro-caspase-3 in tumor tissues of grafted mouse model, which suggested K5 also induced apoptosis of tumor tissues and the decreased intratumoral microvascular density in K5 treated group may correlate with K5-induced endothelial cell apoptosis. These results suggest that tumor growth suppression of K5 depends on its anti-angiogenic activity and K5 could have therapeutic potential in hepatocellular carcinoma." @default.
• W2008476451 created "2016-06-24" @default.
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• W2008476451 date "2006-04-01" @default.
• W2008476451 modified "2023-10-15" @default.
• W2008476451 title "Kringle 5 of human plasminogen suppresses hepatocellular carcinoma growth both in grafted and xenografted mice by anti-angiogenic activity" @default.
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• W2008476451 doi "https://doi.org/10.4161/cbt.5.4.2511" @default.
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