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- W2477438449 abstract "PAK4 is a member of the group B family of p21-activated kinases. Its expression is elevated in many cancer cell lines, and activated PAK4 is highly transforming, suggesting that it plays an important role in tumorigenesis. Although most previous work was carried out with overexpressed PAK4, here we used RNA interference to knock down endogenous PAK4 in cancer cells. By studying PAK4 knockdown HeLa cells, we demonstrated that endogenous PAK4 is required for anchorage-independent growth. Because cell survival is a key part of tumorigenesis and anchorage-independent growth, we studied whether PAK4 has a role in protecting cells from cell death. To address this, we studied the role for PAK4 downstream to the tumor necrosis factor (TNF) receptor. Although overexpressed PAK4 was previously shown to abrogate proapoptotic pathways, here we demonstrate that endogenous PAK4 is required for the full activation of prosurvival pathways induced by TNF .O ur results indicate that PAK4 is required for optimal binding of the scaffold protein TRADD to the activated TNF receptor through both kinase-dependent and kinase-independent mechanisms. Consequently, activation of several prosurvival pathways, including the NFB and ERK pathways, is reduced in the absence of PAK4. Interestingly, constitutive activation of the NFB and ERK pathways could compensate for the lack of PAK4, indicating that these pathways function downstream to PAK4. The role for PAK4 in regulating prosurvival pathways is a completely new function for this protein, and the connection between PAK4 and cell survival under stress helps explain its role in tumorigenesis and development. Tumor necrosis factor (TNF) 2 was originally discovered as an anticancer cytokine that can induce apoptosis in certain tumor cells (1)." @default.
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- W2477438449 date "2005-01-01" @default.
- W2477438449 modified "2023-09-27" @default.
- W2477438449 title "PAK4 Functions in Tumor Necrosis Factor (TNF) -induced Survival Pathways by Facilitating TRADD Binding to the" @default.
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