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CIRBP-OGFR axis safeguards against cardiomyocyte apoptosis and cardiotoxicity induced by chemotherapy.

ABSTRACT: Cold-inducible RNA-binding protein (CIRBP) is documented to be required for maintaining cardiac function, however, its role in chemotherapy-induced cardiotoxicity remains obscured. Herein, we report that CIRBP decreases cardiomyocyte apoptosis and attenuates cardiotoxicity through disrupting OGF-OGFR signal. CIRBP deficiency is involved in diverse chemotherapeutic agents induced cardiomyocyte apoptosis. Delivery of exogenous CIRBP to the mouse myocardium significantly mitigated doxorubicin-induced cardiac apoptosis and dysfunction. Specifically, OGFR was identified as a downstream core effector responsible for chemotherapy-induced cardiomyocyte apoptosis. CIRBP was shown to interact with OGFR mRNA and to repress OGFR expression by reducing mRNA stability. CIRBP-mediated cytoprotection against doxorubicin-induced cardiac apoptosis was demonstrated to largely involve OGFR repression by CIRBP. NTX as a potent antagonist of OGFR successfully rescued CIRBP ablation-rendered susceptibility to cardiac dyshomeostasis upon exposure to doxorubicin, whereas another antagonist ALV acting only on opioid receptors did not. Taken together, our results demonstrate that CIRBP confers myocardium resistance to chemotherapy-induced cardiac apoptosis and dysfunction by dampening OGF/OGFR axis, shedding new light on the mechanisms of chemo-induced cardiotoxicity and providing insights into the development of an efficacious cardioprotective strategy for cancer patients.

SUBMITTER: Liu C

PROVIDER: S-EPMC9066098 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature

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CIRBP-OGFR axis safeguards against cardiomyocyte apoptosis and cardiotoxicity induced by chemotherapy.

Liu Cihang C Cheng Xiaolei X Xing Junyue J Li Jun J Li Zhen Z Jian Dongdong D Wang Ying Y Wang Shixing S Li Ran R Zhang Wanjun W Shao Dongxing D Ma Xiaohan X Chen Xiru X Shen Jia J Shi Chao C Guo Zhiping Z Wang Wengong W Fan Taibing T Liu Lin L Tang Hao H

International journal of biological sciences 20220411 7

Cold-inducible RNA-binding protein (CIRBP) is documented to be required for maintaining cardiac function, however, its role in chemotherapy-induced cardiotoxicity remains obscured. Herein, we report that CIRBP decreases cardiomyocyte apoptosis and attenuates cardiotoxicity through disrupting OGF-OGFR signal. CIRBP deficiency is involved in diverse chemotherapeutic agents induced cardiomyocyte apoptosis. Delivery of exogenous CIRBP to the mouse myocardium significantly mitigated doxorubicin-induc ...[more]

PMID: 35541895

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Project description:Background: Albeit with well-recorded cytoprotective function, the study of stress protein CIRBP coping with cardiotoxicity during chemotherapy remains obscured. Here we report that CIRBP plays a critical role in safeguarding against chemo-induced cardiac apoptosis and dysfunction. Methods: Treating the immortalized human ventricular myocytes (T0519) and neonatal rat ventricular myocytes (NRVMs) with three regular chemotherapeutics (DOX/Cisplatin/5-FU), and DOX-induced cardiotoxic mouse model were leveraged to explore the cardioprotection of CIRBP during chemotherapy. We took advantage of AAV9 carrying CIRBP or shCIRBP expressive cassette under cTNT promoter to interfere with cardiac CIRBP expression. A conjoint analysis of transcriptomics and proteomics was performed within T0519 to identify the latent effector of CIRBP in regulating cardiomyocyte apoptosis. By contrast with the pan-opioid receptor Alvimopan (ALV), OGFR blocker Naltrexone (NTX) was introduced to disrupt CIRBP-OGFR signaling in an attempt to provide new insight in formulating efficacious cardioprotective scheme for tumor patients. Results: We discovered that CIRBP deficiency is involved in in-vivo and in-vitro cardiomyocyte apoptosis triggered by chemotherapeutic agents. Ectopic delivery of CIRBP in mouse myocardium significantly mitigates doxorubicin-induced cardiac apoptosis and malfunction. Opioid growth factor receptor (OGFR) was further highlighted as CIRBP downstream effector responsible for cardiomyocyte chemotherapeutical apoptosis. Mechanistically, CIRBP interacts with OGFR mRNA and represses OGFR expression by reducing mRNA stability. CIRBP-mediated cytoprotection against doxorubicin-induced apoptosis relies largely on the regulation of CIRBP on OGFR. Naltrexone, an antagonist targeting OGFR of potency as well as certain opioid receptors, successfully rescues CIRBP ablation-rendered susceptibility to cardiac apoptosis and dyshomeostasis when exposed to DOX; while another antagonist Alvimopan, merely acting on opioid receptors, does not. Conclusions: Taken together, our results demonstrate that CIRBP confers myocardium resistance to chemotherapy-induced cardiac apoptosis and dysfunction via dampening OGF/OGFR axis, shedding new light on the cardioprotection of tumor patients subjected to chemotherapy.

Project description:Doxorubicin (DOX) as a chemotherapeutic agent can cause mitochondrial dysfunction and heart failure. COX5A has been described as an important regulator of mitochondrial energy metabolism. We investigate the roles of COX5A in DOX-induced cardiomyopathy and explore the underlying mechanisms. C57BL/6J mice and H9c2 cardiomyoblasts were treated with DOX, and the COX5A expression was assessed. An adeno-associated virus serum type 9 (AAV9) and lenti-virus system were used to upregulate COX5A expression. Echocardiographic parameters, morphological and histological analyses, transmission electron microscope and immunofluorescence assays were used to assess cardiac and mitochondrial function. In a human study, we found that cardiac COX5A expression was dramatically decreased in patients with end-stage dilated cardiomyopathy (DCM) compared to the control group. COX5A was significantly downregulated following DOX stimulation in the heart of mice and H9c2 cells. Reduced cardiac function, decreased myocardium glucose uptake, mitochondrial morphology disturbance, reduced activity of mitochondrial cytochrome c oxidase (COX) and lowered ATP content were detected after DOX stimulation in mice, which could be significantly improved by overexpression of COX5A. Overexpression of COX5A effectively protected against DOX-induced oxidative stress, mitochondrial dysfunction and cardiomyocyte apoptosis in vivo and in vitro. Mechanistically, the phosphorylation of Akt (Thr308) and Akt (Ser473) were also decreased following DOX treatment, which could be reserved by the upregulation of COX5A. Furthermore, PI3K inhibitors abrogated the protection effects of COX5A against DOX-induced cardiotoxicity in H9c2 cells. Thus, we identified that PI3K/Akt signaling was responsible for the COX5A-mediated protective role in DOX-induced cardiomyopathy. These results demonstrated the protective effect of COX5A in mitochondrial dysfunction, oxidative stress, and cardiomyocyte apoptosis, providing a potential therapeutic target in DOX-induced cardiomyopathy.

Dataset Information

CIRBP-OGFR axis safeguards against cardiomyocyte apoptosis and cardiotoxicity induced by chemotherapy.

Publications

CIRBP-OGFR axis safeguards against cardiomyocyte apoptosis and cardiotoxicity induced by chemotherapy.

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