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• W2061411427 abstract "It is likely that large-conductance Ca2 +-activated K+ (BKCa) channels channelopathy tightly involved in vascular malfunctions and arterial hypertension development. In the present study, we compared the results of siRNAs-induced α-BKCa gene silencing and vascular abnormalities produced by whole-body ionized irradiation in rats. The experimental design comprised RT-PCR and patch clamp technique, thoracic aorta smooth muscle (SM) contractile recordings and arterial blood pressure (BP) measurements on the 30th day after whole body irradiation (6 Gy) and following siRNAs KCNMA1 gene silencing in vivo. The expression profile of BKCa mRNA transcripts in SM was significantly decreased in siRNAs-treated rats in a manner similar to irradiated SM. In contrast, the mRNA levels of Kv and KATP were significantly increased while L-type calcium channels mRNA transcripts demonstrated tendency to increment. The SMCs obtained from irradiated animals and after KCNMA1 gene silencing showed a significant decrease in total K+ current density amplitude. Paxilline (500 nM)-sensitive components of outward current were significantly decreased in both irradiated and gene silencing SMCs. KCNMA1 gene silencing increased SM sensitivity to norepinephrine while Ach-induced relaxation had decreased. The silencing of KCNMA1 had no significant effect on BP while radiation produced sustained arterial hypertension. Therefore, radiation alters the form and function of the BKCa channel and this type of channelopathy may contribute to related vascular abnormalities. Nevertheless, it is unlikely that BKCa can operate as a crucial factor for radiation-induced arterial hypertension." @default.
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• W2061411427 date "2012-03-01" @default.
• W2061411427 modified "2023-10-06" @default.
• W2061411427 title "The BKCa channels deficiency as a possible reason for radiation-induced vascular hypercontractility" @default.
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• W2061411427 doi "https://doi.org/10.1016/j.vph.2011.12.005" @default.
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