2008
DOI: 10.1016/j.lfs.2008.06.008
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The positive inotropic effect of endothelin-1 is mediated by mitochondrial reactive oxygen species

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Cited by 61 publications
(79 citation statements)
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“…Therefore, ET-1 has been considered the most important factor affecting the pulmonary arterial system and critically impairs vascular activity. In addition, potent vasoconstrictive activity, eg, an activated ET A , reduces the NO bioavailability and maxi- The bioactivity of ET-1 is at least in part mediated by NADPH oxidase, these including positive inotropism in the heart and an elevated [Ca 2+ ] i , which is due to an increased frequency of open individual L-type channels; therefore, increased calcium influx is a consequence of the activation of ET A , and the activation of L-type channels by ET A is mediated by the activation of NADPH oxidase [25,26] (Figure 7). Activated NADPH oxidase is the main source of ROS production, which is evidenced by the appearance of vascular abnormalities upon exposure to intermittent hypoxia and H 2 O 2 -induced ROS and an increase in the intracellular calcium in cardiomyocytes.…”
Section: Discussionmentioning
confidence: 99%
“…Therefore, ET-1 has been considered the most important factor affecting the pulmonary arterial system and critically impairs vascular activity. In addition, potent vasoconstrictive activity, eg, an activated ET A , reduces the NO bioavailability and maxi- The bioactivity of ET-1 is at least in part mediated by NADPH oxidase, these including positive inotropism in the heart and an elevated [Ca 2+ ] i , which is due to an increased frequency of open individual L-type channels; therefore, increased calcium influx is a consequence of the activation of ET A , and the activation of L-type channels by ET A is mediated by the activation of NADPH oxidase [25,26] (Figure 7). Activated NADPH oxidase is the main source of ROS production, which is evidenced by the appearance of vascular abnormalities upon exposure to intermittent hypoxia and H 2 O 2 -induced ROS and an increase in the intracellular calcium in cardiomyocytes.…”
Section: Discussionmentioning
confidence: 99%
“…Továbbá az antioxidáns N-acetil-cisztein a ROS-termelődés visszaszorításával párhuzamosan gyengítette az ET-1-pozitív inotrop hatását [14]. Koráb-bi megfi gyelések szerint, az exogén ET-1 kontraktilis erőt fokozó hatása szinte teljes mértékben kivédhető volt antioxidánsokkal macskaeredetű szívizomsejteken [18,19]. Ugyanezt a modellt használva kimutatták, hogy az angiotenzin-II adása fokozta az endogén ET-1 felszabadulását, amely a ROS-termelődést stimulálva növelte a sejtek kontraktilis erejét [18].…”
Section: Az Et-1 Szívserkentő Hatása éS Az Endogén Ros-termelődésunclassified
“…Eredményeink arra engednek következtetni, hogy az ET-1 inotrop effektusában a NAD(P)H-oxidáz eredetű ROS játszhat szerepet, mivel a NAD(P)H-oxidázt gátló apocynin párhuzamosan csökkentette az ET-1 hatását a kontraktilitásra és a ROStermelődésre [14]. Az intakt patkányszíven nyert adatainkkal összhangban, a NAD(P)H-oxidáz farmakológiai gátlása kivédte az ET-1 inotrop hatását macskaszívből izolált kamrai izomsejteken [19].…”
Section: Az Et-1 Szívserkentő Hatása éS Az Endogén Ros-termelődésunclassified
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“…It increases oxidative stress [211][212][213][214][215][216][217], superoxide [211,[213][214][215][216], the ONOO − marker 3-nitrotyrosine [211,212], NF-B activity [211,217], and NO [211,213,218], lowers levels of BH4 [213-215, 217, 219], stimulates iNOS induction [211,217], increases TRP receptor function [220,221], increases levels of intracellular calcium [222][223][224], increases NMDA activity [225,226], produces mitochondrial dysfunction [227,228], and increases in�ammatory cytokine levels [206,207,217]. All of these provide evidence for elevation of each of the NO/ONOO − cycle elements.…”
Section: Principlementioning
confidence: 99%