Ambient particulate matter-associated autophagy alleviates pulmonary inflammation induced by Platanus pollen protein 3 (Pla3).

Autor: Shumin Z; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China; Lab of Plant Cell Biology, Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China., Luying Z; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China., Senlin L; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China. Electronic address: senlinlv@staff.shu.edu.cn., Jiaxian P; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China., Yang L; Lab of Plant Cell Biology, Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China., Lanfang R; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China., Tingting X; School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China., Wei Z; Lab of Plant Cell Biology, Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China., Shuijun L; Shanghai Xuhui Center Hospital, Shanghai 200031, China., Weqian W; School of Science and Engineering, Saitama University, Saitama 338-8570, Japan., Qingyue W; School of Science and Engineering, Saitama University, Saitama 338-8570, Japan.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Mar 01; Vol. 758, pp. 143696. Date of Electronic Publication: 2020 Dec 10.
DOI: 10.1016/j.scitotenv.2020.143696
Abstrakt: Subpollen particles (SPPs) with diameter less than 1 mm released from allergenic pollen grains contain allergens could trigger asthma and lung inflammation after being inhaled. In the meaning time, ambient fine particles attached on the pollen grains could have further effects on the inflammation. However, the mechanisms underlying these phenomena have not been fully elucidated. In this study, the effects of autophagy triggered by PM 2.5 and Platanus SPPs were evaluated by using the A549 cell lines and a pollen sensitized rat model. First, autophagy in A549 cells was analyzed after exposure to PM 2.5 using acridine orange staining, real-time quantitative PCR (qRT-PCR), and western blot (WB) assays. The increased levels of ROS, superoxide dismutase, and malonaldehyde in the lung homogenates of rats exposed to SPPs indicated that inflammatory response was triggered in the lungs. Treatment with autophagy-inhibiting drugs showed that autophagy suppressed ROS formation and decreased the production of thymic stromal lymphopoietin (TSLP), a critical pathway altering the inflammatory response. Although the effect was indirect, autophagy appeared to negatively regulate TSLP levels, resulting in a compromised immune response. These results suggested that SPPs promote ROS generation and increase TSLP levels, triggering downstream inflammation reactions. However, ambient PM 2.5 could aggravate autophagy, which in turn effectively suppressed ROS and TSLP levels, leading to the alleviation of the immune response and pulmonary inflammation.
Competing Interests: Declaration of competing interest We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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