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• W1665647514 startingPage "104" @default.
• W1665647514 abstract "Endothelin (ET)-1 is a potent vasoconstrictor and comitogen/ proliferation factor for vascular smooth muscle (VSM). As such, it has been implicated in the vascular wall remodeling observed in pulmonary hypertension (PH). Although the endothelium is considered the main source of ET-1, it can be released by other cells including VSM and may mediate proliferation in an autocrine manner. We investigated this possibility using human pulmonary artery smooth-muscle (HPASM) cells. Serum stimulated the release of ET-1 from HPASM cells in a concentration-dependent fashion and caused proliferation as determined by [(3)H]thymidine uptake and increase in cell number. Addition of an ET-A receptor antagonist (BQ123) or an inhibitor of ET-1 synthesis (phosphoramidon) reduced the proliferation induced by serum, confirming an autocrine role for ET-1. In addition, treatment of HPASM cells with two drug types used in the management of PH-cicaprost, a stable prostacyclin-mimetic; or diltiazem, a calcium-channel blocker-reduced ET-1 release from these cells. We conclude that ET-1 released from HPASM cells has an autocrine function in serum-induced proliferation, with important implications for the pathogenesis of human vascular remodeling. Drugs used in the treatment of PH may act, at least in part, by inhibiting this autocrine loop." @default.
• W1665647514 created "2016-06-24" @default.
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• W1665647514 date "2001-07-01" @default.
• W1665647514 modified "2023-09-29" @default.
• W1665647514 title "Endogenously Released Endothelin-1 from Human Pulmonary Artery Smooth Muscle Promotes Cellular Proliferation" @default.
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• W1665647514 doi "https://doi.org/10.1165/ajrcmb.25.1.4331" @default.
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