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• W2155477961 abstract "Abstract. Various growth factors and vasoactive substances are implicated in the pathogenesis of renal growth seen in early diabetes mellitus (DM). Mitogen-activated protein kinase (MAPK) is an important mediator of these extracellular stimuli. Protein kinase C (PKC), an enzyme known to be stimulated in DM, also activates MAPK. Thus, MAPK activity was examined in glomeruli from streptozotocin-induced DM rats. MAPK activity, measured as myelin basic protein kinase, was elevated by approximately 50% in DM versus controls (CON). Increased protein contents of p42 mapk and p44 mapk , as well as increased tyrosine phosphorylation and mobility shift of p42 mapk , were also observed in DM. Tyrosine dephosphorylation of pp42 mapk , on the other hand, assessed by incubating glomerular membrane with or without sodium orthovanadate (vanadate), was significantly diminished in DM. Protein expression of MAPK phosphatase-1 (MKP-1), a dual specificity phosphatase that inactivates MAPK, was approximately 60% of CON. Reduction in MKP-1 was reproduced in cultured mesangial cells grown under high glucose (30 mM; HG). The suppression of MKP-1 was PKC-dependent since incubation of HG cells with phorbol 12-myristate 13-acetate for 24 h abolished it. Furthermore, calcium ionophore A23187 reversed the suppression, suggesting that blunted Ca 2+ signalling, characteristic of HG cells secondary to PKC stimulation, may be the cause. These results demonstrate that glomerular MAPK is activated in DM by multiple mechanisms i.e. , increases in protein contents, increased phosphorylation, and decreased dephosphorylation of the enzyme due to suppression of MKP-1. These alterations may have an implication in the pathogenesis of diabetic nephropathy." @default.
• W2155477961 created "2016-06-24" @default.
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• W2155477961 date "1999-04-01" @default.
• W2155477961 modified "2023-10-10" @default.
• W2155477961 title "Mechanisms of Mitogen-Activated Protein Kinase Activation in Experimental Diabetes" @default.
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• W2155477961 doi "https://doi.org/10.1681/asn.v104738" @default.
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