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- W2098804546 abstract "l-Serine administration reduces mean arterial pressure (MAP) in spontaneously hypertensive rats (SHR) and Wistar-Kyoto (WKY) rats rendered hypertensive by chronic oral treatment with the nitric oxide synthase inhibitor N ω -nitro-l-arginine methyl ester (l-NAME). To determine if the fall in MAP was due to decreases in vascular resistance or cardiac output (CO), and to record regional hemodynamic effects, we measured the distribution of fluorescent microspheres to single bolus intravenous injections of l-serine (1 mmol/kg) in 14-wk-old male WKY, SHR, and l-NAME-treated WKY rats. MAP and total peripheral resistance (TPR) were significantly higher ( P < 0.01), whereas CO was lower in l-NAME-treated WKY ( P < 0.01) and SHR ( P < 0.05). l-Serine administration led to a rapid fall in MAP (WKY 22%, l-NAME-WKY 46%, SHR 34%,) and TPR (WKY 24%, l-NAME-WKY 68%, SHR 53%), whereas CO was elevated. In WKY rats, l-serine induced an increase in blood flow only in the small intestine (53%) while it was more profound in several vascular beds of hypertensive rats [l-NAME-WKY: small intestine (238%), spleen (184%), diaphragm (85%), and liver (65%); SHR: small intestine (217%), spleen (202%), diaphragm (116%), large intestine (105%), pancreas (96%), and liver (93%)]. Pretreatment with a combination of apamin (a small calcium-activated potassium channel inhibitor) and charybdotoxin (an intermediate calcium-activated potassium channel inhibitor) abolished the l-serine-induced changes in blood flow and TPR. l-Serine acts predominantly on apamin- and charybdotoxin-sensitive potassium channels in the splanchnic circulation to increase blood flow, thereby contributing to the fall in TPR and the pronounced blood pressure-lowering effect of l-serine in hypertensive rats." @default.
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- W2098804546 date "2010-06-01" @default.
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- W2098804546 title "Decreases in splanchnic vascular resistance contribute to hypotensive effects of<scp>l</scp>-serine in hypertensive rats" @default.
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- W2098804546 doi "https://doi.org/10.1152/ajpheart.00810.2009" @default.
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