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• W1967719994 abstract "Development of chemotherapy resistance and evasion from apoptosis in osteosarcoma, a primary malignant bone tumor, is often correlated with constitutive nuclear factor-kappaB (NF-kappaB) activation. Here, we investigated the ability of a polyphenolic fraction of green tea (GTP) that has been shown to have antitumor effects on various malignant cell lines to inhibit growth and induce apoptosis in human osteosarcoma SAOS-2 cells. Treatment of SAOS-2 cells with GTP (20-60 microg/ml) resulted in reduced cell proliferation and induction of apoptosis, which correlated with decreased nuclear DNA binding of NF-kappaB/p65 and lowering of NF-kappaB/p65 and p50 levels in the cytoplasm and nucleus. GTP treatment of cells reduced IkappaB-alpha phosphorylation but had no effect on its protein expression. Furthermore, GTP treatment resulted in the inhibition of IKK-alpha and IKK-beta, the upstream kinases that phosphorylate IkappaB-alpha. The increase in apoptosis in SAOS-2 cells was accompanied with decrease in the protein expression of Bcl-2 and concomitant increase in the levels of Bax. GTP treatment of SAOS-2 cells also resulted in significant activation of caspases as was evident by increased levels of cleaved caspase-3 and caspase-8 in these cells. Treatment of SAOS-2 cells with a specific caspase-3 inhibitor Ac-Asp-Glu-Val-Asp-CHO (Ac-DEVD-CHO) and general caspase inhibitor N-benzyloxycarbonyl-Val-Ala-Asp (OMe)-fluoromethyl ketone (Z-VAD-FMK) rescued SAOS-2 cells from GTP-induced apoptosis. Taken together, these results indicate that GTP is a candidate therapeutic for osteosarcoma that mediates its antiproliferative and apoptotic effects via activation of caspases and inhibition of NF-kappaB." @default.
• W1967719994 created "2016-06-24" @default.
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• W1967719994 date "2006-10-01" @default.
• W1967719994 modified "2023-10-18" @default.
• W1967719994 title "Green tea polyphenols-induced apoptosis in human osteosarcoma SAOS-2 cells involves a caspase-dependent mechanism with downregulation of nuclear factor-κB" @default.
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• W1967719994 doi "https://doi.org/10.1016/j.taap.2006.03.013" @default.
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