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- W2022253164 abstract "Type 2 diabetes is due to defects in both insulin action and secretion. In an attempt to discover small molecules that stimulate glucose uptake, similar to insulin, a cell-based glucose uptake screening assay was performed using 3T3-L1 adipocytes. Shikonin, a substance originally isolated from the root of the Chinese plant that has been used as an ointment for wound healing, was thus identified. Shikonin stimulated glucose uptake and potentiated insulin-stimulated glucose uptake in a concentration-dependent manner in 3T3-L1 adipocytes. Stimulation of glucose uptake was also observed in rat primary adipocytes and cardiomyocytes. Like insulin, shikonin-stimulated glucose uptake was inhibited by genistein, a tyrosine kinase inhibitor, and enhanced by vanadate, a tyrosine phosphatase inhibitor. However, in contrast to insulin, shikonin-stimulated glucose uptake was not strongly inhibited by wortmannin, a specific inhibitor of phosphatidylinositol 3-kinase (PI3K). In vitro phosphorylation analyses revealed that shikonin did not induce tyrosine phosphorylation of the insulin receptor, but significantly induced both Thr-308 and Ser-473 phosphorylation of Akt. Our results suggest that in 3T3-L1 adipocytes, shikonin action is not mediated primarily via the insulin receptor/PI3K pathway, but rather via another distinct tyrosine kinase-dependent pathway leading to glucose uptake involving Akt phosphorylation." @default.
- W2022253164 created "2016-06-24" @default.
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- W2022253164 date "2002-04-01" @default.
- W2022253164 modified "2023-09-28" @default.
- W2022253164 title "Shikonin Stimulates Glucose Uptake in 3T3-L1 Adipocytes via an Insulin-Independent Tyrosine Kinase Pathway" @default.
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- W2022253164 doi "https://doi.org/10.1006/bbrc.2002.6714" @default.
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