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Lycium barbarum polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition

  • Authors:
    • Hao Pan
    • Lin Niu
    • Yihao Wu
    • Liuying Chen
    • Xiaowei Zhou
    • Yan Zhao
  • View Affiliations / Copyright

    Affiliations: Department of Cardiology, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310006, P.R. China, Department of Ultrasound, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310006, P.R. China, Department of Cardiology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, Zhejiang 310014, P.R. China
    Copyright: © Pan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 778
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    Published online on: September 7, 2021
       https://doi.org/10.3892/mmr.2021.12418
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Abstract

The irreversible loss of cardiomyocytes is mainly the result of ischemic/reperfusion (I/R) myocardial injury, leading to persistent heart dysfunction and heart failure. It has been reported that Lycium barbarum polysaccharide (LBP) has protective effects on cardiomyocytes, but the specific mechanism is still not completely understood. The present study examined the protective role of LBP in myocardial I/R injury. Rats were subjected to myocardial I/R injury and LBP treatment. Moreover, rat myocardial H9C2 cells exposed to hypoxia/reoxygenation (H/R) were used to simulate cardiac injury during myocardial I/R process and were exposed to LBP, rapamycin (an autophagy activator) or nuclear factor‑erythroid factor 2‑related factor 2 (Nrf2) transfection. Morphological examination, histopathological examination and echocardiography were used to determine the cardiac injury after I/R injury. Cell viability and apoptosis were determined via MTT and flow cytometry assays, respectively. The levels of lactate dehydrogenase (LDH), creatine kinase (CK), cardiac troponin T (cTnT), IL‑1β, IL‑6, TNF‑α, malondialdehyde (MDA) and superoxidase dismutase (SOD) in rat serum, hearts and/or cells were assessed using ELISAs. The expression levels of Beclin 1, LC3II/LC3I, P62 and Nrf2 were analyzed via reverse transcription‑quantitative PCR and western blotting. The results demonstrated that LBP improved heart function and repaired cardiomyocyte damage in I/R model rats, as well as reduced the production of cTnT, CK, LDH, IL‑1β, IL‑6 and TNF‑α. The in vitro study results indicated that LBP increased cell viability, the apoptosis rate, and the levels of SOD and P62, as well as reduced the levels of LDH, CK, IL‑1β, IL‑6, TNF‑α, MDA, Beclin 1 and LC3‑II/LC3‑I in H/R‑injured H9C2 cells. Moreover, LBP promoted Nrf2 nuclear translocation, but decreased Nrf2 expression in the cytoplasm. Rapamycin exacerbated the aforementioned effects in H/R injured H9C2 cells, and partially reversed LBP‑induced effects. Overexpressing Nrf2 counteracted I/R‑induced effects and partially resisted rapamycin‑induced effects. These findings demonstrated that LBP exhibited a cardiac protective effect on the ischemic myocardium of rats after reperfusion and attenuated myocardial I/R injury via autophagy inhibition‑induced Nrf2 activation.
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Copy and paste a formatted citation
Spandidos Publications style
Pan H, Niu L, Wu Y, Chen L, Zhou X and Zhao Y: <em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition. Mol Med Rep 24: 778, 2021.
APA
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., & Zhao, Y. (2021). <em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition. Molecular Medicine Reports, 24, 778. https://doi.org/10.3892/mmr.2021.12418
MLA
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., Zhao, Y."<em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition". Molecular Medicine Reports 24.5 (2021): 778.
Chicago
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., Zhao, Y."<em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition". Molecular Medicine Reports 24, no. 5 (2021): 778. https://doi.org/10.3892/mmr.2021.12418
Copy and paste a formatted citation
x
Spandidos Publications style
Pan H, Niu L, Wu Y, Chen L, Zhou X and Zhao Y: <em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition. Mol Med Rep 24: 778, 2021.
APA
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., & Zhao, Y. (2021). <em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition. Molecular Medicine Reports, 24, 778. https://doi.org/10.3892/mmr.2021.12418
MLA
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., Zhao, Y."<em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition". Molecular Medicine Reports 24.5 (2021): 778.
Chicago
Pan, H., Niu, L., Wu, Y., Chen, L., Zhou, X., Zhao, Y."<em>Lycium barbarum</em> polysaccharide protects rats and cardiomyocytes against ischemia/reperfusion injury via Nrf2 activation through autophagy inhibition". Molecular Medicine Reports 24, no. 5 (2021): 778. https://doi.org/10.3892/mmr.2021.12418
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