Abstract：
AIMS:Benidipine is a dihydropyridine (DHP) derived Ca2+ antagonist, can block triple Ca2+ channels (L, N, and T). It has been used as a safety anti-hypertensive drug because of its long-acting relaxant effect on vascular smooth muscle (VSM). However, whether benidipine has similar pharmacological actions in airway smooth muscle (ASM) is unknown. This research aims to reveal the relaxant property and Ca2+ antagonistic effect of benidipine on ASM. MAIN METHODS:The relaxant property of mouse ASM was investigated by tissue tension tests, and Ca2+ antagonistic effect was evaluated through patch-clamp techniques. KEY FINDINGS:Benidipine caused dose-dependent relaxations on high K+ (80 mM) induced precontraction in mouse ASM, which relied on inhibition of extracellular Ca2+ influx, and 1 μM benidipine totally blocked L-type voltage-dependent Ca2+ channels (LVDCCs) currents in airway smooth muscle cells (ASMCs). Benidipine also showed dose-dependent inhibition of ACh-induced precontraction with or without the LVDCCs blocker nifedipine, and 100 μM benidipine blocked ACh-stimulated Ca2+ influx through not only LVDCCs but also non-selective cation channels (NSCCs). SIGNIFICANCE:Benidipine blocked LVDCCs and NSCCs to abolish these channels-mediated Ca2+ influx, which relaxed precontracted ASM. This study represented benidipine with a new potential medicinal value for ASM hypercontractility.
journal_name
Life Scijournal_title
Life sciencesauthors
Yang Y,Chen W,Wen N,Cai C,Liu QH,Shen Jdoi
10.1016/j.lfs.2019.04.036subject
Has Abstractpub_date
2019-06-15 00:00:00pages
74-81eissn
0024-3205issn
1879-0631pii
S0024-3205(19)30298-Xjournal_volume
227pub_type
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