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• W2039842428 endingPage "90" @default.
• W2039842428 startingPage "80" @default.
• W2039842428 abstract "MAP kinase pathways comprise a group of parallel protein phosphorylation cascades, which are involved in signaling triggered by a variety of stimuli. Previous findings suggested that the ERK and the JNK pathways have opposing roles in regulating proliferation and survival or apoptosis and that apoptosis can be promoted by inhibiting the ERK pathway or by activation of the JNK pathway. In order to test this hypothesis and explore whether it can be exploited as a strategy for killing human cancer cells, we used gene transfer experiments with a range of cancer cell lines. We expressed the catalytic fragment of human MEKK1 to activate JNK and the Ras-binding domain (RBD) of Raf-1 to inhibit the Ras–ERK pathway. In addition, we designed several RBD–MEKK1 fusion proteins aiming to simultaneously activate the JNK and block the ERK pathway. We found that the MEKK1 proteins as well as the RBD alone could reduce colony formation in all cell lines. The survival time of MEKK1-expressing cells depended on the cell line. In HeLa cells, survival could be prolonged by inhibition of caspases but not by coexpression of the anti-apoptotic protein Bcl-2. Due to a lower kinase activity the RBD–MEKK1 fusion proteins were less effective in apoptosis induction than the MEKK1 kinase domain alone. Using mutant forms of Ras and Raf-1 we could show that the reduced kinase activity of RBD–MEKK1 fusion proteins was caused by binding to the Ras protein. The expression of lethal doses of MEKK1 resulted in a strong activation of all three major MAP kinase families JNK, ERK, and p38. Blocking these pathways either by coexpressing a dominant negative form of MKK4 or with inhibitors of MEK or p38 failed to inhibit apoptosis. This suggests that MEKK1 induces apoptosis by causing a general deregulation of MAP kinase signaling rather than by the activation of a single pathway." @default.
• W2039842428 created "2016-06-24" @default.
• W2039842428 creator A5024586079 @default.
• W2039842428 creator A5036674933 @default.
• W2039842428 creator A5086158908 @default.
• W2039842428 date "2003-02-01" @default.
• W2039842428 modified "2023-10-16" @default.
• W2039842428 title "The kinase domain of MEKK1 induces apoptosis by dysregulation of MAP kinase pathways" @default.
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• W2039842428 doi "https://doi.org/10.1016/s0014-4827(02)00018-6" @default.
• W2039842428 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12565821" @default.
• W2039842428 hasPublicationYear "2003" @default.
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