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- W1970147341 abstract "The Gfi-1 protooncogene encodes a nuclear zinc-finger protein that carries a novel repressor domain, SNAG, and functions as a position- and orientation-independent active transcriptional repressor. The Gfi-1 repressor allows interleukin 2 (IL-2)-dependent T cells to escape G 1 arrest induced by IL-2 withdrawal in culture and collaborates with c- myc and pim-1 for the induction of retrovirus-induced lymphomas in animals. Here we show that overexpression of Gfi-1 also inhibits cell death induced by cultivation of IL-2-dependent T-cell lines in IL-2-deficient media. Similarly, induction of Gfi-1 in primary thymocytes from mice carrying a metal-inducible Gfi-1 transgene inhibits cell death induced by cultivation in vitro . The protein and mRNA levels of the proapoptotic regulator Bax are down-regulated by Gfi-1 in both immortalized T-cell lines and primary transgenic thymocytes. The repression is direct and depends on several Gfi-1-binding sites in the p53-inducible Bax promoter. In addition to Bax , Gfi-1 also represses Bak , another apoptosis-promoting member of the Bcl-2 gene family. Therefore, Gfi-1 may inhibit apoptosis by means of its repression of multiple proapoptotic regulators. The antiapoptotic properties of Gfi-1 provide a potential explanation for its strong collaboration with c- myc during oncogenesis." @default.
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- W1970147341 date "1996-12-10" @default.
- W1970147341 modified "2023-10-17" @default.
- W1970147341 title "The Gfi-1 protooncoprotein represses <i>Bax</i> expression and inhibits T-cell death" @default.
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- W1970147341 doi "https://doi.org/10.1073/pnas.93.25.14569" @default.
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