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- W2338761486 abstract "The protein synthesis inhibitor anisomycin activates stress-related mitogen-activated protein kinases (MAPKs), namely, c-jun NH2-terminal kinase (p46/54JNK) and p38MAPK in mammalian cells. In this paper, we show that although exposure to anisomycin resulted in rapid and strong activation of p46/54JNK and p38MAPK, with a delayed low level dual-phosphorylation of mitogen/extracellular protein kinase (p42/44MAPK), low density lipoprotein (LDL) receptor induction depends solely on the mild activation of p42/44MAPK signaling cascade in HepG2 cells. Unlike hepatocyte growth factor (HGF) which caused LDL receptor induction via rapid, strong, and Ras-dependent p42/44MAPK activation, anisomycin-induced p42/44MAPK activity and increased LDL receptor expression in a Ras-independent manner. Finally, we examined the role of the p42/44MAPK signaling cascade in LDL receptor induction by activating this kinase independently of anisomycin or HGF. By using estrogen-dependent human Raf-1 protein kinase in transient transfection assays, we show that the exclusive activation of the Raf-1/MEK-1/p42/44MAPK signaling cascade with antiestrogen ICI 182,780 caused induction of LDL receptor expression to the same level as observed with either HGF or anisomycin. Consistent with the role of p42/44MAPK, induction was strongly inhibited by pretreatment with the MEK-1/2 inhibitor PD98059. Our observation that anisomycin can use p42/44MAPK signaling cascade is a departure from established thinking, and the results presented shows that activation of the p42/44MAPK alone is sufficient to fully induce LDL receptor transcription.—Dhawan, P., A. Bell, A. Kumar, C. Golden, and K. D. Mehta. Critical role of p42/44MAPK activation in anisomycin and hepatocyte growth factor-induced LDL receptor expression: activation of Raf-1/MEK-1/p42/44MAPK cascade alone is sufficient to induce LDL receptor expression. J. Lipid Res. 1999. 40: 1911–1919." @default.
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- W2338761486 date "1999-10-01" @default.
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- W2338761486 title "Critical role of p42/44MAPK activation in anisomycin and hepatocyte growth factor-induced LDL receptor expression: activation of Raf-1/MEK-1/p42/44MAPK cascade alone is sufficient to induce LDL receptor expression" @default.
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- W2338761486 doi "https://doi.org/10.1016/s0022-2275(20)34908-7" @default.
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