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Current Molecular Medicine

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ISSN (Print): 1566-5240
ISSN (Online): 1875-5666

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Research Article

Role of Mitophagy in Cigarette Smoke-induced Lung Epithelial Cell Injury In Vitro

Author(s): Suwen Wang, Xiaomin Song, Liangyu Wei, Qi Liu, Chenfei Li and Jiong Wang*

Volume 23, Issue 10, 2023

Published on: 28 November, 2022

Page: [1130 - 1140] Pages: 11

DOI: 10.2174/1566524023666221025100002

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Abstract

Background: Mitochondria mediate airway inflammatory responses to cigarette smoke (CS). Removal of damaged or defective mitochondrial (mitophagy) may prevent the detrimental impact of CS extract (CSE) on airway and lung epithelial cells.

Methods: We studied the effect of a mitophagy activator (Urolithin A, UA) and a mitophagy inhibitor (Liensinine diperchlorate, Ld) on CSE-exposed alveolar (A549) and airway (BEAS-2B) epithelial cell proliferation, intracellular and mitochondrial ROS, inflammatory response, mitochondrial membrane potential (Δψm), mitochondrial morphology, mitochondrial complex activities, and protein levels of mitochondrial fission (DRP1, MFF) and mitophagy (SQSTM1/p62, LC3B). In both cell types, CSE exposure led to increased intracellular and mitochondrial oxidative stress, decreased Δψm and resulted in structural disruption of the mitochondrial network. CSE increased the expression of DRP1, MFF and SQSTM1/p62 while decreasing LC3B-II/I protein expression ratio. CSE also increased inflammatory (IL-1β, IL-6, IL-18, CXCL1, CXCL8) and necroptosis factors (RIPK1, RIPK3, MLKL) mRNA expression.

Results: Pre-treatment with UA attenuated CSE-induced oxidative stress, inflammatory and necroptosis gene expression and restored mitochondrial structure and function. UA also prevented CSE-evoked increases in DRP1, MFF and SQSTM1/p62 protein expression and increased LC3B-II/I ratio. Conversely, pre-treatment with Ld aggravated CSE-induced cellular and mitochondrial responses.

Conclusion: In conclusion, mitophagy mediates CSE-induced damage and inflammation of lung epithelial cells and may represent a therapeutic target in CS-driven diseases.

Keywords: Cigarette smoke, lung epithelial cell, mitochondria, mitophagy, necroptosis, COPD.

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