Abstract
Over the past few years, ozone has been identified as a potential risk factor for exacerbating asthma. However, few attempts have been made to prevent the progression of ozone-exacerbated asthma. This study investigated the attenuating effects of melatonin on ozone-aggravated allergic asthma, and explored the changes to the transient receptor potential vanilloid 1 (TRPV1)-nuclear factor erythroid-derived 2-related factor 2 (Nrf2) pathway associated with melatonin treatment. The levels of TRPV1 and calcitonin gene-related peptides (CGRP) in lung tissue were detected by immunohistochemistry, western blot, and enzyme-linked immunosorbent assay (ELISA). The Nrf2 signaling involved proteins and mRNA were evaluated by western blot and RT-qPCR. The change of Immunoglobulin E (IgE) and T helper (Th) 2 and Th17 cytokines in serum and bronchoalveolar lavage fluid (BALF) was determined by ELISA. Recruitment of inflammatory cells in BALF, histopathological changes, and airway hyperresponsiveness (AHR) were also determined in lung tissues. Our results indicated that melatonin treatment significantly reduced oxidative stress, as indicated by levels of glutathione (GSH), malonaldehyde (MDA), and 8-hydroxy-2-deoxyguanosine (8-OH-dG). Moreover, ozone-exacerbated asthma symptoms, such as inflammatory cell infiltration, levels of serum immunoglobulin, Th2 and Th17 cytokines in BALF, obvious changes in lung histology, and AHR, were all ameliorated by melatonin treatment. Interestingly, melatonin not only markedly decreased the protein levels of TRPV1 and CGRP, but also enhanced the expression of Nrf2, quinone oxidoreductase-1 (NQO-1), and heme oxygenase-1 (HO-1). Taken together, our results demonstrate that melatonin administration could antagonize ozone-exacerbated asthma by inhibiting the TRPV1 channel and stabilizing the Nrf2 pathway.
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Funding
This work was funded by the National Natural Science Foundation of China (81903278), Hubei Provincial Department of Education Science Research Program (Q20191103) and Regular Undergraduate Institutions Nature Science Research Project of Guizhou Education Department (Technology top-notch talent support project QianjiaoheKYzi [2018] 083).
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Jinquan Li, Yushan Chen, and Xu Yang conceived and designed the experiments. Xiaoyu Wu, Jinquan Li, and Xudong Liu performed the experiments. Jinquan Li, Yushan Chen, and Xu Yang analyzed the data. Yushan Chen, Yan Zeng, and Jinquan Li wrote the manuscript. Jinquan Li revised the manuscript. All authors have given approval to the final version of the manuscript.
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Chen, Y., Wu, X., Yang, X. et al. Melatonin antagonizes ozone-exacerbated asthma by inhibiting the TRPV1 channel and stabilizing the Nrf2 pathway. Environ Sci Pollut Res 28, 59858–59867 (2021). https://doi.org/10.1007/s11356-021-14945-9
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DOI: https://doi.org/10.1007/s11356-021-14945-9