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- W2119252648 abstract "The production of 20-hydroxyeicosatetraenoic acid (20-HETE) is increased during ischemia-reperfusion, and inhibition of 20-HETE production has been shown to reduce infarct size caused by ischemia. This study was aimed to discover the molecular mechanism underlying the action of 20-HETE in cardiac myocytes. The effect of 20-HETE on L-type Ca 2+ currents ( I Ca,L ) was examined in rat isolated cardiomyocytes by patch-clamp recording in the whole cell mode. Superfusion of cardiomyocytes with 20-HETE (10–100 nM) resulted in a concentration-dependent increase in I Ca,L , and this action of 20-HETE was attenuated by a specific NADPH oxidase inhibitor, gp91ds-tat (5 μM), or a superoxide scavenger, polyethylene glycol-superoxide dismutase (25 U/ml), suggesting that NADPH-oxidase-derived superoxide is involved in the stimulatory action of 20-HETE on I Ca,L . Treatment of cardiomyocytes with 20-HETE (100 nM) increased both NADPH oxidase activity and superoxide production by approximately twofold. To study the molecular mechanism mediating the 20-HETE-induced increase in NADPH oxidase activity, PKC activity was measured in cardiomyocytes. Incubation of the cells with 20-HETE (100 nM) significantly increased PKC activity, and pretreatment of cardiomyocytes with a selective PKC inhibitor, GF-109203 (1 μM), attenuated the 20-HETE-induced increases in I Ca,L and in NADPH oxidase activity. In summary, 20-HETE stimulates NADPH oxidase-derived superoxide production, which activates L-type Ca 2+ channels via a PKC-dependent mechanism in cardiomyocytes. 20-HETE and 20-HETE-producing enzymes could be novel targets for the treatment of cardiac ischemic diseases." @default.
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- W2119252648 date "2010-10-01" @default.
- W2119252648 modified "2023-10-18" @default.
- W2119252648 title "20-HETE increases NADPH oxidase-derived ROS production and stimulates the L-type Ca<sup>2+</sup> channel via a PKC-dependent mechanism in cardiomyocytes" @default.
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- W2119252648 doi "https://doi.org/10.1152/ajpheart.00067.2010" @default.
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