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- W2101909316 abstract "Abstract Deregulated signaling by the epidermal growth factor receptor family of proteins is encountered in human malignancies including breast cancer. Cell cycle and apoptosis-regulatory protein-1 (CARP-1), a novel, perinuclear phosphoprotein, is a regulator of apoptosis signaling by epidermal growth factor receptors. CARP-1 expression is diminished in human breast cancers, and correlates inversely with human breast cancer grades which could be attributed to increased methylation. The expression of CARP-1, on the other hand, interferes with the ability of human breast cancer cells to invade through the matrigel-coated membranes, to form colonies in the soft agar, and to grow as s.c. tumors in severe combined immunodeficiency (SCID) mice. To test whether CARP-1 is a suppressor of human breast cancer growth, we generated transactivator of transcription (TAT)–tagged CARP-1 peptides. Treatment of human breast cancer cells with affinity purified, TAT-CARP-1 1–198, 197–454, and 896–1150 peptides caused inhibition of human breast cancer cell proliferation and elevated apoptosis. In contrast, TAT-tagged enhanced green fluorescent protein or CARP-1 (1–198Y192/F) peptide failed to inhibit cell proliferation or induce apoptosis. Apoptosis by CARP-1 peptides, with the exception of CARP-1 (1–198Y192/F), involves the activation of p38 stress-activated protein kinase and caspase-9. Moreover, administration of TAT-CARP-1 (1–198), but not TAT-tagged enhanced green fluorescent protein or TAT-CARP-1 (1–198Y192/F), inhibits growth of human breast cancer cell–derived tumor xenografts in SCID mice. We conclude that CARP-1 is a suppressor of human breast cancer growth, and its expression is diminished in tumors, in part, by methylation-dependent silencing. [Mol Cancer Ther 2007;6(5):1661–72]" @default.
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- W2101909316 date "2007-05-01" @default.
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- W2101909316 title "Transactivator of transcription–tagged cell cycle and apoptosis regulatory protein-1 peptides suppress the growth of human breast cancer cells in vitro and in vivo" @default.
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- W2101909316 doi "https://doi.org/10.1158/1535-7163.mct-06-0653" @default.
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