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Mitochondriaassociated protein LRPPRC exerts cardioprotective effects against doxorubicininduced toxicity, potentially via inhibition of ROS accumulation

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Doxorubicin (DOX) has been widely employed to treat cancer, particularly solid tumors and hematological malignancies, owing to its high efficacy; however, chemotherapy has been indicated to be cardiotoxic and induce adverse effects, including mitochondrial dysfunction and DNA damage, which limits its application. The mitochondriaassociated protein leucinerich pentatricopeptide repeatcontaining (LRPPRC) has been reported to serve critical regulatory roles in physiological processes via regulating mitochondrial function. The aim of the present study was to investigate the possible protective effects of LRPPRC against DOXinduced cardiac injury. In a DOXinduced cardiotoxicity model in H9C2 cells, LRPPRC was indicated to be transcriptionally upregulated and stabilize Bcl2 and Bax. LRPPRC overexpression exhibited protective effects against proliferation and both apoptotic and nonapoptotic cell death following DOX treatment, but not under normal conditions. It was additionally observed that overexpressed LRPPRC reversed the decreases in ATP synthesis, mitochondrial mass and transcriptional activity, which were induced by DOX exposure. Overexpressed LRPPRC also decreased the accumulation of reactive oxygen species (ROS) under DOX treatment and inhibited cell death to a similar extent as NacetylLcysteine, which is a known ROS scavenger, indicating that LRPPRC potentially exerts protective effects via inhibiting ROS accumulation. Moreover, LRPPRC overexpression protected H9C2 cells against oxidative stress induced by H2O2, which also indicated its ROSscavenging function. The present study demonstrated for the first time, to the best of our knowledge, that DOXinduced LRPPRC may exert cardioprotective effects via inhibiting ROS accumulation, thereby maintaining mitochondrial function.
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Document Type: Research Article

Affiliations: Department of Cardiac Surgery, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou 563006, P.R. China

Publication date: October 1, 2020

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  • Experimental and Therapeutic Medicine aims to ensure the expedient publication, in both print and electronic format, of studies relating to biology, gene therapy, infectious disease, microbiology, molecular cardiology and molecular surgery. The journal welcomes studies pertaining to all aspects of molecular medicine, and studies relating to in vitro or in vivo experimental model systems relevant to the mechanisms of disease are also included.

    All materials submitted to this journal undergo the appropriate review via referees who are experts in this field. All materials submitted follow international guidelines with regard to approval of experiments on humans and animals.
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