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Hypertonic saline inhibits airway smooth muscle contraction by inhibiting Ca2+ sensitization.

Xiao-Cao LiuQian WangYu-Shan SheShu ChenXi LuoHao XuDun-An ZangWen-Jing ZhangJun-Ying QiuBei-Bei LiuJinhua ShenYong-Bo PengPing ZhaoLu XueWeiwei ChenLi-Qun MaXiangning FuJingyu ChenQing-Hua LiuMeng-Fei Yu
Published in: Clinical and experimental pharmacology & physiology (2017)
The effects of hypertonic solution on airway smooth muscle (ASM) contraction and the underlying mechanisms are largely unknown. We found that hypertonic saline (HS) inhibited acetylcholine (ACh)-induced contraction of ASM from the mouse trachea and human bronchi. In single mouse ASM cells (ASMCs), ACh induced an increase in intracellular Ca2+ that was further enhanced by 5% NaCl, indicating that the HS-induced inhibition of ASM contraction was not mediated by a decrease in cytosolic Ca2+ . The Rho-associated kinase (ROCK) inhibitor Y-27632 relaxed ACh-induced precontraction of mouse tracheal rings. However, such inhibition was not observed after the relaxation induced by 5% NaCl. Moreover, the incubation of mouse tracheal rings with 5% NaCl decreased ACh-induced phosphorylation of myosin light chain 20 and myosin phosphatase target subunit 1. These data indicate that HS inhibits the contraction of ASM by inhibiting Ca2+ sensitization, not by decreasing intracellular Ca2+ .
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