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• W2074437785 abstract "mTOR, the mammalian target of rapamycin, is a critical target of survival signals in many human cancers. In the absence of serum, rapamycin induces apoptosis in MDA-MB-231 human breast cancer cells. However, in the presence of serum, rapamycin induces G(1) cell cycle arrest-indicating that a factor(s) in serum suppresses rapamycin-induced apoptosis. We report here that transforming growth factor-beta (TGF-beta) suppresses rapamycin-induced apoptosis in serum-deprived MDA-MB-231 cells in a protein kinase Cdelta (PKCdelta)-dependent manner. Importantly, if TGF-beta signaling or PKCdelta was suppressed, rapamycin induced apoptosis rather than G(1) arrest in the presence of serum. And, if cells were allowed to progress into S phase, rapamycin induced apoptosis in the presence of serum. BT-549 and MDA-MB-468 breast, and SW-480 colon cancer cells have defects in TGF-beta signaling and rapamycin induced apoptosis in these cells in the presence of either serum or TGF-beta. Thus, in the absence of TGF-beta signaling, rapamycin becomes cytotoxic rather than cytostatic. Importantly, this study provides evidence indicating that tumors with defective TGF-beta signaling--common in colon and pancreatic cancers--will be selectively sensitive to rapamycin or other strategies that target mTOR." @default.
• W2074437785 created "2016-06-24" @default.
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• W2074437785 date "2007-08-13" @default.
• W2074437785 modified "2023-09-27" @default.
• W2074437785 title "Defective TGF-β signaling sensitizes human cancer cells to rapamycin" @default.
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• W2074437785 doi "https://doi.org/10.1038/sj.onc.1210721" @default.
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