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- W86755265 abstract "In response to oxidant stress, the cardiovascular system is known to express a number of genes, which could occur owing to the participation of mitogen-activated protein kinases such as MAPKs, ERK and JNK (SAPK) followed by stimulation of at least two well-defined transcription factors NF-KB and AP-1 (c-Fos and c-Jun). Oxidants activate cytosolic and membrane-bound PLA2 activities with the subsequent production of AA metabolites such as HETEs, which subsequently stimulate ERK and JNK (SAPK) activities leading to the activation of transcriptional factors and the ultimate stimulation of the transcription of several mitogen–stress-responsive genes. LacCer, a ceramide analogue present in atherosclerotic plaques, has been found to induce proliferation of aortic smooth muscle cells. LacCer is involved in Ras-GTP loading, activation of kinase cascades (MEK, Raf, p44 MAPK) and c-fos expression. TNF-α, on the other hand, induces c-fos, c-myc and c-jun expression. Recent investigations link ceramide and its analogues to the extracellular signal-regulated kinase (ERK) cascade, stress-activated protein kinase–c-Jun kinase (SAPK/JNK) cascade and apoptotic responses. These critical steps in the signalling pathways are sensitive to intracellular thiol–redox and protease(s)–antiprotease(s) status, both of which can be modified by oxidants. Because mobilisation of intracellular Ca2+ caused by a variety of signals also plays a role in the activation of the signalling pathways, an important aspect of future work will be to ascertain the roles of oxidants and Ca2+ individually and in combination in the activation of the signalling pathways. The following two important questions also deserve future attention: (1) How does NF-kB shield cells from apoptotic death? and (2) By what mechanisms does the activated NF-kB cause cellular transformation? Furthermore, the role of AP-1 acting as transcriptional activator seems clear, but the target genes remain to be defined." @default.
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- W86755265 date "1998-11-01" @default.
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- W86755265 title "Oxidant-Mediated Activation of Mitogen- Activated Protein Kinases and Nuclear Transcription Factors in the Cardiovascular System" @default.
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- W86755265 doi "https://doi.org/10.1016/s0898-6568(98)00014-x" @default.
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