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• W2033012904 abstract "The serotonin (5-HT) uptake system is supposed to play a crucial part in vascular functions by fine-tuning the local concentration of 5-HT in the vicinity of 5-HT(2) receptors in vascular smooth muscle cells. In this study, the mechanism of 5-HT uptake in human brain vascular smooth muscle cells (HBVSMCs) was investigated. [(3)H]5-HT uptake in HBVSMCs was Na(+)-independent. Kinetic analyses of [(3)H]5-HT uptake in HBVSMCs revealed a K(m) of 50.36 ± 10.2 mM and a V(max) of 1033.61 ± 98.86 pmol/mg protein/min. The specific serotonin re-uptake transporter (SERT) inhibitor citalopram, the specific norepinephrine transporter (NET) inhibitor desipramine, and the dopamine transporter (DAT) inhibitor GBR12935 inhibited 5-HT uptake in HBVSMCs with IC(50) values of 97.03 ± 40.10, 10.49 ± 5.98, and 2.80 ± 1.04 μM, respectively. These IC(50) values were 100-fold higher than data reported by other authors, suggesting that those inhibitors were not blocking their corresponding transporters. Reverse transcription-polymerase chain reaction results demonstrated the presence of mRNA for organic cation transporter (OCT)-3 and plasma membrane monoamine transporter (PMAT), but the absence of OCT-1, OCT-2, SERT, NET, and DAT. siRNA knockdown of OCT-3 and PMAT specifically attenuated 5-HT uptake in HBVSMCs. It is concluded that 5-HT uptake in HBVSMCs was mediated predominantly by a low-affinity and Na(+)-independent mechanism. The most probable candidates are OCT-3 and PMAT, but not the SERT." @default.
• W2033012904 created "2016-06-24" @default.
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• W2033012904 date "2013-01-01" @default.
• W2033012904 modified "2023-10-16" @default.
• W2033012904 title "Involvement of Organic Cation Transporter-3 and Plasma Membrane Monoamine Transporter in Serotonin Uptake in Human Brain Vascular Smooth Muscle Cells" @default.
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• W2033012904 doi "https://doi.org/10.3389/fphar.2013.00014" @default.
• W2033012904 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3569667" @default.
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