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• W2051570483 endingPage "1967" @default.
• W2051570483 startingPage "1955" @default.
• W2051570483 abstract "Effects of insulin on cerebral arteries have never been examined. Therefore, we determined cerebrovascular actions of insulin in rats. Both PCR and immunoblot studies identified insulin receptor expression in cerebral arteries and in cultured cerebral microvascular endothelial cells (CMVECs). Diameter measurements (% change) of isolated rat cerebral arteries showed a biphasic dose response to insulin with an initial vasoconstriction at 0.1 ng/mL (−9.7%±1.6%), followed by vasodilation at 1 to 100 ng/mL (31.9%±1.4%). Insulin also increased cortical blood flow in vivo (30%±8% at 120 ng/mL) when applied topically. Removal of reactive oxygen species (ROS) abolished the vasoconstriction to insulin. Endothelial denudation, inhibition of K + channels, and nitric oxide (NO) synthase, all diminished insulin-induced vasodilation. Inhibition of cytochrome P450 enhanced vasodilation in endothelium-intact arteries, but promoted vasoconstriction after endothelial denudation. Inhibition of cyclooxygenase abolished vasoconstriction and enhanced vasodilation to insulin in all arteries. Inhibition of endothelin type A receptors enhanced vasodilation, whereas endothelin type B receptor blockade diminished vasodilation. Insulin treatment in vitro increased Akt phosphorylation in cerebral arteries and CMVECs. Fluorescence studies of CMVECs showed that insulin increased intracellular calcium and enhanced the generation of NO and ROS. Thus, cerebrovascular responses to insulin were mediated by complex mechanisms originating in both the endothelium and smooth muscle." @default.
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• W2051570483 date "2009-09-02" @default.
• W2051570483 modified "2023-10-16" @default.
• W2051570483 title "Cerebrovascular Responses to Insulin in Rats" @default.
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• W2051570483 doi "https://doi.org/10.1038/jcbfm.2009.177" @default.
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