Mechanisms of nicotine-induced cutaneous vasodilation and sweating in young adults: roles for KCa, KATP, and KV channels, nitric oxide, and prostanoids
Mechanisms of nicotine-induced cutaneous vasodilation and sweating in young adults: roles for KCa, KATP, and KV channels, nitric oxide, and prostanoids
复制标题
尼古丁诱导年轻人皮肤血管舒张和出汗的机制:KCa、KATP 和 KV 通道、一氧化氮和前列腺素的作用
DOI:
10.1139/apnm-2016-0615
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发表时间:
2017
影响因子:
3.4
通讯作者:
and Kenny GP.
中科院分区:
文献类型:
--
作者:
Fujii N;Louie JC;McNeely BD;Amano T;Nishiyasu T;and Kenny GP.
We evaluated the influence of K+channels (i.e., Ca2+-activated K+(KCa), ATP-sensitive K+(KATP), and voltage-gated K+(KV) channels) and key enzymes (nitric oxide synthase (NOS) and cyclooxygenase (COX)) on nicotine-induced cutaneous vasodilation and sweating. Using intradermal microdialysis, we evaluated forearm cutaneous vascular conductance (CVC) and sweat rate in 2 separate protocols. In protocol 1 (n= 10), 4 separate sites were infused with (i) lactated Ringer (Control), (ii) 50 mmol·L−1tetraethylammonium (KCachannel blocker), (iii) 5 mmol·L−1glybenclamide (KATPchannel blocker), and (iv) 10 mmol·L−14-aminopyridine (KVchannel blocker). In protocol 2 (n= 10), 4 sites were infused with (i) lactated Ringer (Control), (ii) 10 mmol·L−1Nω-nitro-l-arginine (NOS inhibitor), (iii) 10 mmol·L−1ketorolac (COX inhibitor), or (iv) a combination of NOS+COX inhibitors. At all sites, nicotine was infused in a dose-dependent manner (1.2, 3.6, 11, 33, and 100 mmol·L−1; each for 25 min). Nicotine-induced increase in CVC was attenuated by the KCa, KATP, and KVchannel blockers, whereas nicotine-induced increase in sweat rate was reduced by the KCaand KVchannel blockers (P≤ 0.05). COX inhibitor augmented nicotine-induced increase in CVC (P≤ 0.05), which was absent when NOS inhibitor was co-administered (P> 0.05). In addition, our secondrary experiment (n= 7) demonstrated that muscarinic receptor blockade with 58 μmol·L−1atropine sulfate salt monohydrate abolished nicotine-induced increases in CVC (1.2–11 mmol·L−1) and sweating (all doses). We show that under a normothermic resting state: (i) KCa, KATP, and KVchannels contribute to nicotinic cutaneous vasodilation, (ii) inhibition of COX augments nicotinic cutaneous vasodilation likely through NOS-dependent mechanism(s), and (iii) KCaand KVchannels contribute to nicotinic sweating.