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Mechanisms underlying the pathogenesis of hyper-contractility of bronchial smooth muscle in allergic asthma
Airway hyperresponsiveness (AHR) and inflammation are key pathophysiological features of asthma. Enhanced contraction of bronchial smooth muscle (BSM) is one of the causes of the AHR. It is thus important for development of asthma therapy to understand the change in the contractile signaling of airw...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Japan Society of Smooth Muscle Research
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5411784/ https://www.ncbi.nlm.nih.gov/pubmed/28484126 http://dx.doi.org/10.1540/jsmr.53.37 |
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author | Sakai, Hiroyasu Suto, Wataru Kai, Yuki Chiba, Yoshihiko |
author_facet | Sakai, Hiroyasu Suto, Wataru Kai, Yuki Chiba, Yoshihiko |
author_sort | Sakai, Hiroyasu |
collection | PubMed |
description | Airway hyperresponsiveness (AHR) and inflammation are key pathophysiological features of asthma. Enhanced contraction of bronchial smooth muscle (BSM) is one of the causes of the AHR. It is thus important for development of asthma therapy to understand the change in the contractile signaling of airway smooth muscle cells associated with the AHR. In addition to the Ca(2+)-mediated phosphorylation of myosin light chain (MLC), contractile agonists also enhance MLC phosphorylation level, Ca(2+)-independently, by inactivating MLC phosphatase (MLCP), called Ca(2+) sensitization of contraction, in smooth muscle cells including airways. To date, involvements of RhoA/ROCKs and PKC/Ppp1r14a (also called as CPI-17) pathways in the Ca(2+) sensitization have been identified. Our previous studies revealed that the agonist-induced Ca(2+) sensitization of contraction is markedly augmented in BSMs of animal models of allergen-induced AHR. In BSMs of these animal models, the expression of RhoA and CPI-17 proteins were significantly increased, indicating that both the Ca(2+) sensitizing pathways are augmented. Interestingly, incubation of BSM cells with asthma-associated cytokines, such as interleukin-13 (IL-13), IL-17, and tumor necrosis factor-α (TNF-α), caused up-regulations of RhoA and CPI-17 in BSM cells of naive animals and cultured human BSM cells. In addition to the transcription factors such as STAT6 and NF-κB activated by these inflammatory cytokines, an involvement of down-regulation of miR-133a, a microRNA that negatively regulates RhoA translation, has also been suggested in the IL-13- and IL-17-induced up-regulation of RhoA. Thus, the Ca(2+) sensitizing pathways and the cytokine-mediated signaling including microRNAs in BSMs might be potential targets for treatment of allergic asthma, especially the AHR. |
format | Online Article Text |
id | pubmed-5411784 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Japan Society of Smooth Muscle Research |
record_format | MEDLINE/PubMed |
spelling | pubmed-54117842017-05-15 Mechanisms underlying the pathogenesis of hyper-contractility of bronchial smooth muscle in allergic asthma Sakai, Hiroyasu Suto, Wataru Kai, Yuki Chiba, Yoshihiko J Smooth Muscle Res Invited Review Airway hyperresponsiveness (AHR) and inflammation are key pathophysiological features of asthma. Enhanced contraction of bronchial smooth muscle (BSM) is one of the causes of the AHR. It is thus important for development of asthma therapy to understand the change in the contractile signaling of airway smooth muscle cells associated with the AHR. In addition to the Ca(2+)-mediated phosphorylation of myosin light chain (MLC), contractile agonists also enhance MLC phosphorylation level, Ca(2+)-independently, by inactivating MLC phosphatase (MLCP), called Ca(2+) sensitization of contraction, in smooth muscle cells including airways. To date, involvements of RhoA/ROCKs and PKC/Ppp1r14a (also called as CPI-17) pathways in the Ca(2+) sensitization have been identified. Our previous studies revealed that the agonist-induced Ca(2+) sensitization of contraction is markedly augmented in BSMs of animal models of allergen-induced AHR. In BSMs of these animal models, the expression of RhoA and CPI-17 proteins were significantly increased, indicating that both the Ca(2+) sensitizing pathways are augmented. Interestingly, incubation of BSM cells with asthma-associated cytokines, such as interleukin-13 (IL-13), IL-17, and tumor necrosis factor-α (TNF-α), caused up-regulations of RhoA and CPI-17 in BSM cells of naive animals and cultured human BSM cells. In addition to the transcription factors such as STAT6 and NF-κB activated by these inflammatory cytokines, an involvement of down-regulation of miR-133a, a microRNA that negatively regulates RhoA translation, has also been suggested in the IL-13- and IL-17-induced up-regulation of RhoA. Thus, the Ca(2+) sensitizing pathways and the cytokine-mediated signaling including microRNAs in BSMs might be potential targets for treatment of allergic asthma, especially the AHR. Japan Society of Smooth Muscle Research 2017-05-03 2017 /pmc/articles/PMC5411784/ /pubmed/28484126 http://dx.doi.org/10.1540/jsmr.53.37 Text en ©2017 The Japan Society of Smooth Muscle Research This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/). |
spellingShingle | Invited Review Sakai, Hiroyasu Suto, Wataru Kai, Yuki Chiba, Yoshihiko Mechanisms underlying the pathogenesis of hyper-contractility of bronchial smooth muscle in allergic asthma |
title | Mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
title_full | Mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
title_fullStr | Mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
title_full_unstemmed | Mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
title_short | Mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
title_sort | mechanisms underlying the pathogenesis of hyper-contractility of
bronchial smooth muscle in allergic asthma |
topic | Invited Review |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5411784/ https://www.ncbi.nlm.nih.gov/pubmed/28484126 http://dx.doi.org/10.1540/jsmr.53.37 |
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