No independent, but an interactive, role of calcium-activated potassium channels in human cutaneous active vasodilation.
No independent, but an interactive, role of calcium-activated potassium channels in human cutaneous active vasodilation.
复制标题
钙激活钾通道在人体皮肤主动血管舒张中没有独立的作用,而是相互作用的。
DOI:
10.1152/japplphysiol.00358.2013
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Minson,ChristopherT
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文献类型:
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作者:
Brunt,ViennaE;Fujii,Naoto;Minson,ChristopherT
In human cutaneous microvasculature, endothelium-derived hyperpolarizing factors (EDHFs) account for a large portion of vasodilation associated with local stimuli. Thus we sought to determine the role of EDHFs in active vasodilation (AVD) to passive heating in two protocols. Whole body heating was achieved using water-perfused suits (core temperature increase of 0.8–1.0°C), and skin blood flow was measured using laser-Doppler flowmetry. In the first protocol, four sites were perfused continuously via microdialysis with:1) control;2) tetraethylammonium (TEA) to block calcium-activated potassium (KCa) channels, and thus the actions of EDHFs;3)N-nitro-l-arginine methyl ester (l-NAME) to inhibit nitric oxide synthase (NOS); and4) TEA +l-NAME (n= 8). Data are presented as percent maximal cutaneous vascular conductance (CVC). TEA had no effect on AVD (CVC during heated plateau: control 57.4 ± 4.9% vs. TEA 63.2 ± 5.2%,P= 0.27), indicating EDHFs are not obligatory.l-NAME attenuated plateau CVC to 33.7 ± 5.4% (P< 0.01 vs. control); while TEA +l-NAME augmented plateau CVC compared withl-NAME alone (49.7 ± 5.3%,P= 0.02). From these data, it appears combined blockade of EDHFs and NOS necessitates dilation through other means, possibly through inward rectifier (KIR) and/or ATP-sensitive (KATP) potassium channels. To test this second hypothesis, we measured AVD at the following sites (n= 8):1) control,2)l-NAME,3)l-NAME + TEA, and4)l-NAME + TEA + barium chloride (BaCl2; KIRand KATPblocker). The addition of BaCl2tol-NAME + TEA reduced plateau CVC to 32.7 ± 6.6% (P= 0.02 vs.l-NAME + TEA), which did not differ from thel-NAME site. These data combined demonstrate a complex interplay between vasodilatory pathways, with cross-talk between NO, KCachannels, and KIRand/or KATPchannels.
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DOI:
10.1152/ajpheart.00423.2004
发表时间:
2005
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
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作者:
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通讯作者:
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通讯作者:
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DOI:
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