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• W2129774154 abstract "Chronic hypertension is associated with an impaired vascular relaxation caused by an increased vascular tone; however, the underlying mechanisms are not fully understood in human patients. The present study was to investigate whether large-conductance Ca 2+ - and voltage-activated K + (BK Ca ) channels are involved in dysfunctional relaxation of artery in Han Chinese patients with hypertension using the perforated patch clamp, inside-out single-channel, and macromembrane patch recording techniques to determine whole-cell current, spontaneous transient outward current, open probability, and Ca 2+ sensitivity and the reverse transcription polymerase chain reaction and Western blot analysis to examine the gene and protein expression of α-subunit (KCa1.1) and β1-subunit (KCNMB1) of BK Ca channels in isolated human vascular smooth muscle cells and mesenteric arteries from normotensive and hypertensive patients. It was found that whole-cell current density, spontaneous transient outward current, and Ca 2+ sensitivity, but not single-channel open probability and slope conductance, were significantly decreased in vascular smooth muscle cells from patients with hypertension. Interestingly, mRNA and protein levels of KCNMB1, but not KCa1.1, were reduced in the arterial tissue from patients with hypertension. These results demonstrate for the first time that whole-cell current, spontaneous transient outward current, and Ca 2+ sensitivity of BK Ca channels are reduced in human vascular smooth muscle cells, which resulted from downregulation of β 1-subunit of the channel. This may account, at least in part, for the dysfunction of artery relaxation in Han Chinese patients with primary hypertension." @default.
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• W2129774154 date "2013-02-01" @default.
• W2129774154 modified "2023-10-12" @default.
• W2129774154 title "Function of BK _Ca Channels Is Reduced in Human Vascular Smooth Muscle Cells From Han Chinese Patients With Hypertension" @default.
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• W2129774154 doi "https://doi.org/10.1161/hypertensionaha.111.00211" @default.
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