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• W2056961285 abstract "We studied the role of hypoxia-inducible factor-1α (HIF-1α) in human lung adenocarcinoma cell invasion using a metastatic cell model composed of low invasive CL1 and highly invasive CL1-5 cells. We showed that HIF-1α was expressed in CL1-5 but not in CL1 cells under normoxic condition, and that inhibition of HIF-1α expression by a small interfering RNA decreased invasiveness of CL1-5 cells. Complementary, overexpression of HIF-1α increased the invasiveness of CL1 and gastric cancer SC-M1 cells. Subsequently, we showed that urokinase-type plasminogen activator receptor (uPAR), and matrix metalloproteinases (MMPs) 1 and 2 were critical in HIF-1α-induced invasion. Mechanistic studies revealed that HIF-1α overexpression could increase the expression of uPAR and MMP1, but not MMP2. However, ELISA assays on the conditioned media generated from control CL1 and CL1 cells overexpressing HIF-1α showed that overexpression of HIF-1α increased the levels of endogenous free active MMP2 and total free MMP2, and the former was blocked by inhibition of MMP1 expression. We conclude that (i) HIF-1α overexpression enhances lung cancer cell invasion at least through up-regulating the expression and activities of uPAR, MMP1, and MMP2; and (ii) induction of MMP1 participates in cell invasion and also plays an important role in HIF-1α-induced activation of MMP2." @default.
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• W2056961285 date "2007-04-01" @default.
• W2056961285 modified "2023-09-30" @default.
• W2056961285 title "Hypoxia-inducible factor 1α regulates lung adenocarcinoma cell invasion" @default.
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• W2056961285 doi "https://doi.org/10.1016/j.yexcr.2007.01.013" @default.
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