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- W2123492011 abstract "This study characterized myogenic activation of skeletal muscle (gracilis) resistance arteries from lean (LZR) and obese Zucker rats (OZR). Arteries from OZR exhibited increased myogenic activation versus LZR; this increase was impaired by endothelium denudation or nitric oxde synthase inhibition. Treatment of vessels with 17-octadecynoic acid impaired responses in both strains by comparable amounts. Dihydroethidine microfluorography indicated elevated vascular superoxide levels in OZR versus LZR; immunohistochemistry demonstrated elevated vascular nitrotyrosine levels in OZR, indicating increased peroxynitrite presence. Vessel treatment with oxidative radical scavengers (polythylene glycol-superoxide dismutase/catalase) or inhibition of Ca(2+)-activated K(+) (K(Ca)) channels (iberiotoxin) did not alter myogenic activation in LZR but normalized activation in OZR. Application of peroxynitrite to vessels of OZR caused a greater vasoconstriction versus LZR; the response was impaired in OZR by elevated intraluminal pressure and was abolished in both strains by iberiotoxin. These results suggest that enhanced myogenic activation of gracilis arteries of OZR versus LZR 1) is not due to alterations in cytochrome P-450 contribution, and 2) may be due to elevated peroxynitrite levels inhibiting K(Ca) channels following increased intraluminal pressure." @default.
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- W2123492011 date "2002-12-01" @default.
- W2123492011 modified "2023-09-27" @default.
- W2123492011 title "Oxidant stress-induced increase in myogenic activation of skeletal muscle resistance arteries in obese Zucker rats" @default.
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- W2123492011 doi "https://doi.org/10.1152/ajpheart.00379.2002" @default.
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