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• W2071034573 abstract "Constitutive activation of M-Ras has previously been reported to cause morphologic and growth transformation of murine cells, suggesting that M-Ras plays a role in tumorigenesis. Cell transformation by M-Ras correlated with weak activation of the Raf/MEK/ERK pathway, although contributions from other downstream effectors were suggested. Recent studies indicate that signaling events distinct from the Raf/MEK/ERK cascade are critical for human tumorigenesis. However, it is unknown what signaling events M-Ras triggers in human cells. Using constitutively active M-Ras (Q71L) containing additional mutations within its effector-binding loop, we found that M-Ras induces MEK/ERK-dependent and -independent Elk1 activation as well as phosphatidylinositol 3 kinase (PI3K)/Akt and JNK/cJun activation in human MCF-7 breast cancer cells. Among several human cell lines examined, M-Ras-induced MEK/ERK-independent Elk1 activation was only detected in MCF-7 cells, and correlated with Rlf/M-Ras interaction and Ral/JNK activation. Supporting a role for M-Ras signaling in breast cancer, EGF activated M-Ras and promoted its interaction with endogenous Rlf. In addition, constitutive activation of M-Ras induced estrogen-independent growth of MCF-7 cells that was dependent on PI3K/Akt, MEK/ERK, and JNK activation. Thus, our studies demonstrate that M-Ras signaling activity differs between human cells, highlighting the importance of defining Ras protein signaling within each cell type, especially when designing treatments for Ras-induced cancer. These findings also demonstrate that M-Ras activity may be important for progression of EGFR-dependent tumors. J. Cell. Biochem. 113: 1253–1264, 2012. © 2011 Wiley Periodicals, Inc." @default.
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• W2071034573 date "2012-02-23" @default.
• W2071034573 modified "2023-10-01" @default.
• W2071034573 title "M-Ras induces Ral and JNK activation to regulate MEK/ERK-independent gene expression in MCF-7 breast cancer cells" @default.
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• W2071034573 doi "https://doi.org/10.1002/jcb.23458" @default.
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