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- W1983053407 abstract "Some data in the literature suggest that serine/threonine phosphorylation is required for activation of the mixed-lineage kinases (MLKs), a subgroup of mitogen-activated protein kinase kinase kinases (MAPKKKs). In this report, we demonstrate that the MLK family member DLK is activated and concurrently tyrosine-phosphorylated in cells exposed to the protein tyrosine phosphatase inhibitor vanadate. Tyrosine phosphorylation appears crucial for activation as incubation of vanadate-activated DLK molecules with a tyrosine phosphatase substantially reduced DLK enzymatic activity. Interestingly, the effects of vanadate on DLK are completely blocked by treatment with a Src family kinase inhibitor, PP2, or the expression of short hairpin RNA (shRNA) directed against Src. DLK also fails to undergo vanadate-stimulated tyrosine phosphorylation and activation in fibroblasts which lack expression of Src, Yes and Fyn, but reintroduction of wild-type Src or Fyn followed by vanadate treatment restores this response. In addition to vanadate, stimulation of cells with platelet-derived growth factor (PDGF) also induces tyrosine phosphorylation and activation of DLK by a Src-dependent mechanism. DLK seems important for PDGF signaling because its depletion by RNA interference substantially reduces PDGF-stimulated ERK and Akt kinase activation. Thus, our findings suggest that Src-dependent tyrosine phosphorylation of DLK may be important for regulation of its activity, and they support a role for DLK in PDGF signaling." @default.
- W1983053407 created "2016-06-24" @default.
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- W1983053407 date "2009-04-01" @default.
- W1983053407 modified "2023-09-23" @default.
- W1983053407 title "The mixed-lineage kinase DLK undergoes Src-dependent tyrosine phosphorylation and activation in cells exposed to vanadate or platelet-derived growth factor (PDGF)" @default.
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- W1983053407 doi "https://doi.org/10.1016/j.cellsig.2008.12.009" @default.
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