Ghrelin ameliorates A549 cell apoptosis caused by paraquat via p38-MAPK regulated mitochondrial apoptotic pathway

Toxicology
Shuqing CuiZhiqiang Zhang

Abstract

Paraquat has relatively strong detrimental effects on humans and animals and can cause acute lung injury with high mortality. Ghrelin is a brain-gut peptide which plays important roles in regulating various physiological processes. This study investigated whether ghrelin could inhibit paraquat-induced lung injuries and attempted to elucidate the possible molecular mechanisms. A549 cells were preincubated with different concentrations of ghrelin and then treated with 200 μM of PQ for 24 h. Then cell survival, apoptosis, cellular oxidative stress and lipid peroxidation of A549 cells were detected after different treatments. Subsequently, we analyzed the mitochondrial membrane potential (ΔΨm) and measured caspase-3 activation in A549 cells. In addition, we investigated the activation of the MAPKs pathway and the function of p38-MAPK within mitochondrial apoptosis. Our study indicated that ghrelin administration improved cell viability and reduced apoptosis of PQ-treated A549 cells dose-dependently. Ghrelin treatment reduced the elevation of ROS and MDA, while improved GSH content in A549 cells after paraquat exposure. Moreover, we found that ghrelin dose-dependently increased ΔΨm and decreased caspase-3 activity. The phosphorylate...Continue Reading

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Citations

Aug 4, 2020·The Journal of Toxicological Sciences·Hua-Wei ZhaoXue-Song Dong
Jun 9, 2020·Oxidative Medicine and Cellular Longevity·Zhiqiang ZhangJinying Zhang
Feb 3, 2021·Critical Reviews in Toxicology·Rajasekaran Subbiah, Rajnarayan R Tiwari
May 11, 2021·Frontiers in Pharmacology·Yanxia GaoDing Yuan

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