Abstract
Purpose: To investigate the underlying mechanism of cardiomyocyte protection of carvedilolbased on autophagy and apoptosis.
Methods: Neonatal rat ventricular myocytes (NRVMs) were exposed to various concentrations of carvedilolbefore anoxia, and pretreated with 3-MA or compound C for inhibiting autophagy or p-AMPK expression.CCK-8 colorimeter and flow cytometry were used to determine the cell viability and apoptoticrates. The variation of mRNA and protein was measured by RT-PCR and Western blot. The presence ofautophagosomes was observed by electron microscopy.
Results: First, we found that carvedilol increased autophagic marker levels in a concentration-dependentmanner and the number of autophagosomes in NRVMs. Moreover, carvedilol substantially enhanced theviability and noticeably reduced the CK, MDA and LDH levels and cell apoptosis rate compared with theanoxia group. In addition, carvedilol decreased the levels of caspase-3 and Bim in mRNA and protein, butsuch effect was blocked by the special autophagy inhibitor-3-MA, and the number of autophagosomeswas significantly decreased when treated with 3-MA, indicating that carvedilol exhibited anti-apoptoticand anti-injury effects by inducing autophagy in anoxia NRVMs, but these effects can be abolished byadding 3-MA to suppress autophagy. Finally, the carvedilol treatment-induced autophagy by enhancingthe activation of p-AMPK and inhibiting p-mTOR. Electron microscopy presented that the number ofautophagosomes was significantly decreased when treating with compound C, indicating that carvedilolinduced autophagy in anoxia NRVMs partly by the AMPK-mTOR signaling pathway.
Conclusion: Carvedilol has cardioprotection by inducing autophagy against apoptosis partly through theAMPK/mTOR pathway during anoxia in NRVMs.
Keywords:Carvedilol, autophagy, anoxia, apoptosis, AMPK/mTOR signal pathway, cardiomyocyte protection.
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Letters in Drug Design & Discovery
Title:The Newly Proposed Mechanism of Cardiomyocyte Protection of Carvedilol-Anti-Apoptosis Pattern of Carvedilol in Anoxia by Inducing AutophagyPartly through the AMPK/mTOR Pathway
Volume: 20Issue: 10
Author(s):Jingru Li, Chaozhong Li, Guihu Sun, Longjun Li, Yongli Zeng, Huawei Wang, Xinyu Wu, Ping Yang, Yunzhu Peng*Luqiao Wang*
Affiliation:
- Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
- Department of Cardiology, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China
Keywords:Carvedilol, autophagy, anoxia, apoptosis, AMPK/mTOR signal pathway, cardiomyocyte protection.
Abstract:
Purpose: To investigate the underlying mechanism of cardiomyocyte protection of carvedilolbased on autophagy and apoptosis.
Methods: Neonatal rat ventricular myocytes (NRVMs) were exposed to various concentrations of carvedilolbefore anoxia, and pretreated with 3-MA or compound C for inhibiting autophagy or p-AMPK expression.CCK-8 colorimeter and flow cytometry were used to determine the cell viability and apoptoticrates. The variation of mRNA and protein was measured by RT-PCR and Western blot. The presence ofautophagosomes was observed by electron microscopy.
Results: First, we found that carvedilol increased autophagic marker levels in a concentration-dependentmanner and the number of autophagosomes in NRVMs. Moreover, carvedilol substantially enhanced theviability and noticeably reduced the CK, MDA and LDH levels and cell apoptosis rate compared with theanoxia group. In addition, carvedilol decreased the levels of caspase-3 and Bim in mRNA and protein, butsuch effect was blocked by the special autophagy inhibitor-3-MA, and the number of autophagosomeswas significantly decreased when treated with 3-MA, indicating that carvedilol exhibited anti-apoptoticand anti-injury effects by inducing autophagy in anoxia NRVMs, but these effects can be abolished byadding 3-MA to suppress autophagy. Finally, the carvedilol treatment-induced autophagy by enhancingthe activation of p-AMPK and inhibiting p-mTOR. Electron microscopy presented that the number ofautophagosomes was significantly decreased when treating with compound C, indicating that carvedilolinduced autophagy in anoxia NRVMs partly by the AMPK-mTOR signaling pathway.
Conclusion: Carvedilol has cardioprotection by inducing autophagy against apoptosis partly through theAMPK/mTOR pathway during anoxia in NRVMs.
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Cite this article as:
Li Jingru, Li Chaozhong, Sun Guihu, Li Longjun, Zeng Yongli, Wang Huawei, Wu Xinyu, Yang Ping, Peng Yunzhu*, Wang Luqiao*, The Newly Proposed Mechanism of Cardiomyocyte Protection of Carvedilol-Anti-Apoptosis Pattern of Carvedilol in Anoxia by Inducing AutophagyPartly through the AMPK/mTOR Pathway, Letters in Drug Design & Discovery 2023; 20 (10) .https://dx.doi.org/10.2174/1570180819666220513150100
DOI https://dx.doi.org/10.2174/1570180819666220513150100 | Print ISSN 1570-1808 |
Publisher Name Bentham Science Publisher | Online ISSN 1875-628X |

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