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The multisite phosphorylation of the transcription factor ATF-2 was investigated using transformed embryonic fibroblasts from wild-type mice and mice deficient in c-Jun N-terminal kinases (JNK)1 and 2, and in the presence and absence of inhibitors of p38 mitogen-activated protein kinase (p38 MAPK) and the classical MAP kinase cascade. In wild-type cells, p38 MAPK and extracellular signal-regulated...
A stress-activated protein kinase pathway comprising mitogen-activated protein kinase kinases (MKKs), c-Jun N-terminal kinase (JNK) and the transcription factor c-Jun is implicated in neuronal apoptosis. Using an immune-complex kinase assay, we measured the activation of MKK4 and MKK7 in low potassium (LK)-induced apoptosis of rat cerebellar granule neurons (CGN). MKK7, but not MKK4, was activated...
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