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- W2042082319 abstract "Background Estrogens are cardioprotective hormones and are reported to have antianginal properties. We examined the effect of physiological concentrations of 17β-estradiol on coronary reactivity in anesthetized female farm pigs. Methods and Results Epicardial coronary cross-sectional area (CSA) was assessed by two-dimensional intravascular ultrasound, average coronary peak flow velocity (APV) by intravascular Doppler velocimetry, and coronary blood flow (CBF) was calculated. Dose-response curves to intracoronary endothelin-1 (ET-1, 1 pmol/L to 10 nmol/L), the selective ET B receptor agonist sarafotoxin (1 pmol/L to 10 nmol/L), and serotonin (0.1 nmol/L to 1 μmol/L) were assessed before and after a 10-minute infusion of intracoronary estradiol (1 nmol/L). Before estradiol administration, ET-1 induced significant dose-dependent decreases in CSA, APV, and CBF. Estradiol attenuated ET-1–induced epicardial vasoconstriction ( P <.001) as well as ET-1–induced decreases in APV ( P =.05) and CBF ( P =.012). In an additional five pigs, vehicle (DMSO) had no effect on ET-1–induced coronary vasoconstriction. Before estradiol administration, sarafotoxin induced no net change in CSA but induced increases in APV and CBF, the extent of which did not change significantly after estradiol. Serotonin induced small decreases in CSA but increased APV and CBF. Estradiol did not influence serotonin-induced changes in CSA, APV, or CBF. Conclusions We conclude that estradiol attenuates ET-1–induced vasoconstriction, possibly through effects on the ET A receptor, because selective ET B receptor-induced stimulation with sarafotoxin remained unchanged. Such an effect on the ET A receptor may relate to the antianginal properties of estrogens." @default.
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- W2042082319 date "1997-11-18" @default.
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- W2042082319 title "Physiological Concentrations of Estradiol Attenuate Endothelin 1–Induced Coronary Vasoconstriction In Vivo" @default.
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- W2042082319 doi "https://doi.org/10.1161/01.cir.96.10.3626" @default.
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