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- W2018973043 abstract "Polyol pathway hyperactivity-induced decreases in protein kinase C (PKC) activities have been proposed as a pathogenic mechanism of diabetic neuropathy. Increased PKC activities have recently been invoked in the pathogenesis of other diabetic complications, especially retinopathy, nephropathy, and macroangiopathy. However, it remains unclear whether PKC activities in neural cells such as Schwann cells are increased, decreased, or unchanged. This study investigated the effects of high glucose and increased polyol pathway activity on neural cell growth and PKC activities.Rat Schwannoma cells were cultured in 5.5 or 20 mM glucose in the presence or absence of an aldose reductase inhibitor, epalrestat (1 microM) for 14 days. Proliferation activities, PKC activities, and the protein expression of PKC isoforms were measured.Proliferation and PKC activities under the 20 mM glucose condition were significantly decreased compared to those under the 5.5 mM glucose condition and were prevented by epalrestat. Among PKC isoforms, the protein expression of PKC-alpha under the 20 mM glucose condition was significantly reduced compared to that under the 5.5 mM glucose condition. Epalrestat significantly inhibited the decreased expression of PKC-alpha protein. There were no significant changes in the protein expression of PKC-beta.These results suggest that PKC, especially PKC-alpha activity, is decreased in Schwann cells exposed to high glucose and that this deficit is mediated through polyol pathway hyperactivity." @default.
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- W2018973043 date "2003-01-01" @default.
- W2018973043 modified "2023-10-12" @default.
- W2018973043 title "Polyol pathway and protein kinase C activity of rat Schwannoma cells" @default.
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- W2018973043 doi "https://doi.org/10.1002/dmrr.354" @default.
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