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• W2068586063 abstract "Abstract Serotonin (5HT) is a platelet‐stored vasoconstrictor. Altered concentrations of circulating 5HT are implicated in several pathologic conditions, including hypertension. The actions of 5HT are mediated by different types of receptors and terminated by a single 5HT transporter (SERT). Therefore, SERT is a major mechanism that regulates plasma 5HT levels to prevent vasoconstriction and thereby secure a stable blood flow. In this study, the response of platelet SERT to the plasma 5HT levels was examined within two models: (i) in subjects with chronic hypertension or normotension; (ii) on platelets isolated from normotensive subjects and pretreated with 5HT at various concentrations. The platelet 5HT uptake rates were lower during hypertension due to a decrease in V max with a similar K m ; also, the decrease in V max was primarily due to a decrease in the density of SERT on the platelet membrane, with no change in whole cell expression. Additionally, while the platelet 5HT content decreased 33%, the plasma 5HT content increased 33%. Furthermore, exogenous 5HT altered the 5HT uptake rates by changing the density of SERT molecules on the plasma membrane in a biphasic manner. Therefore, we hypothesize that in a hypertensive state, the elevated plasma 5HT levels induces a loss in 5HT uptake function in platelets via a decrease in the density of SERT molecules on the plasma membrane. Through the feedback effect of this proposed mechanism, plasma 5HT controls its own concentration levels by modulating the uptake properties of platelet SERT." @default.
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• W2068586063 date "2007-02-28" @default.
• W2068586063 modified "2023-10-16" @default.
• W2068586063 title "Plasma serotonin levels and the platelet serotonin transporter" @default.
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• W2068586063 doi "https://doi.org/10.1111/j.1471-4159.2007.04542.x" @default.
• W2068586063 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3041643" @default.
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