Bcl-2 Proteins Regulate Mitophagy in Lipopolysaccharide-Induced Acute Lung Injury via PINK1/Parkin Signaling Pathway

Oxidative Medicine and Cellular Longevity
Zhihao ZhangYoutan Liu

Abstract

Mitophagy is involved in sepsis-induced acute lung injury (ALI). Bcl-2 family proteins play an important role in mitochondrial homeostasis. However, whether targeting Bcl-2 proteins (Bcl-2 and Bad) could influence mitophagy in ALI remains unclear. In this study, lipopolysaccharide (LPS) was used to induce injury in A549 cells and ALI in mice. LPS treatment resulted in elevated cell apoptosis, enhanced mitophagy, decreased Bcl-2 expression, increased Bad expression, and activation of PINK1/Parkin signaling in cells and lung tissues. Both Bcl-2 overexpression and Bad knockdown attenuated LPS-induced injury, inhibited cell apoptosis and mitophagy, and improved survival. Atg5 knockout (KO) inhibited LPS-induced cell apoptosis. Furthermore, Bcl-2 proteins regulated mitophagy by modulating the recruitment of Parkin from the cytoplasm to mitochondria via direct protein-protein interactions. These results were further confirmed in Park2 KO cells and Park2-/- mice. This is the first study to demonstrate that Bcl-2 proteins regulated mitophagy in LPS-induced ALI via modulating the PINK1/Parkin signaling pathway, promoting new insights into the mechanisms and investigation of therapeutic strategies for a septic patient with ALI.

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Citations

Oct 10, 2020·Biological Chemistry·Simone WanderoyAngelika B Harbauer
Feb 6, 2021·Biological Chemistry·Simone WanderoyAngelika B Harbauer
Mar 18, 2021·Oxidative Medicine and Cellular Longevity·Runmin ZhaoDingyu Tan

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Methods Mentioned

BETA
lavage
transfection
transmission electron microscopy
immunoprecipitation
ubiquitination
Assay
Bronchoalveolar
bronchoalveolar lavage
electrophoresis
PCR

Software Mentioned

SPSS

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