Abstract
The endothelium-dependent regulation of vascular tone is predominantly by four major players: nitric oxide (NO), prostaglandin I2 (PGI2), endothelium-derived hyperpolarizing factor (EDHF), and endothelin-1 (ET-1). The former three are vasodilators, while ET-1 is a potent vasoconstrictor. NO and PGI2 exert their effects primarily by activating, respectively, cGMP–cGMP-dependent protein kinase (PKG) and cAMP–cAMP-dependent pathways, which result in decreased Ca2+ influx, suppressed Ca2+ release from the sarcoplasmic reticulum, reduced sensitivity of myofilament to Ca2+, and consequently vasodilatation. Unlike NO and PGI2, the identity of EDHF differs depending on vessel sizes and types as well as species. The better known two EDHFs are epoxyeicosatrienoic acids (EETs) and H2O2. All EDHFs cause vasodilatation mainly by activation of K+ channels, leading to membrane hyperpolarization and decreased Ca2+ influx. Among these vasodilators, NO is the dominant player, PGI2 often has a complementary role, and EDHFs are more important in resistant arteries where NO is less crucial. The vasodilatory effects of these agents are counteracted by various vasoconstrictors in particular ET-1, which exerts its effect by stimulating Ca2+ influx, promoting Ca2+ release from the sarcoplasmic reticulum, and enhancing Ca2+ sensitivity of myofilament. ET-1 has delicate and complicated interactions with endothelium-derived NO as well as other vasodilators. The balance between the constrictor actions and dilator actions is essential for vascular hemostasis.
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Gao, Y. (2017). Endothelium-Derived Factors. In: Biology of Vascular Smooth Muscle: Vasoconstriction and Dilatation. Springer, Singapore. https://doi.org/10.1007/978-981-10-4810-4_8
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