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- W2929381581 abstract "Airway smooth muscle (ASM) is involved in asthma airway inflammation. The aim of this study was to evaluate the effect of substance P and neurokinin-1 receptor (NK-1R) antagonist on intracellular calcium concentration ([Ca2+]i) in airway smooth muscle cells (ASMCs), ASMC contraction, and the effect on reverse-mode Na+-Ca2+ exchanger (NCX) currents in ASMCs. In our study, primary rat ASMCs were cultured. ASMCs were identified by immunofluorescence. [Ca2+]i variations were measured by fluorescence microscopy. Cell shortening (%) and relaxation (%) were analyzed with phase-contrast microscopy. Patch clamp techniques were used to assess NCX currents in ASMCs. We found that substance P increased, and NK-1R antagonist decreased [Ca2+]i in ASMCs. Substance P induced ASMCs contraction, and NK-1R antagonist can make ASMC relax. Patch clamp techniques were implemented to analyze NCX currents in ASMCs. Substance P increased reverse-mode NCX currents in ASMCs but the current density was lower than the one treated with acetylcholine (Ach). NK-1R antagonist reduced reverse-mode NCX current activity in ASMCs, and the current density was similar to the one treated with the reversed NCX inhibitor. So, we concluded that substance P increased [Ca2+]i in ASMCs by promoting the reverse-mode NCX current and stimulating ASMCs, whereas NK-1R antagonist decreased [Ca2+]i in ASMCs by decreasing the reverse-mode NCX current to make ASMCs relax." @default.
- W2929381581 created "2019-04-11" @default.
- W2929381581 creator A5061407463 @default.
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- W2929381581 date "2019-05-01" @default.
- W2929381581 modified "2023-10-16" @default.
- W2929381581 title "Neurokinin-1 receptor antagonist decreases [Ca2+]i in airway smooth muscle cells by reducing the reverse-mode Na+/Ca2+ exchanger current" @default.
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- W2929381581 doi "https://doi.org/10.1016/j.peptides.2019.03.004" @default.
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