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Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress

  • Authors:
    • Zhipeng Zhu
    • Xiaoyan Ling
    • Hongmei Zhou
    • Caijun Zhang
  • View Affiliations / Copyright

    Affiliations: Department of Anesthesiology, The Second Affiliated Hospital of Jiaxing University, Jiaxing, Zhejiang 314000, P.R. China, Outpatient Nursing Department, The Second Affiliated Hospital of Jiaxing University, Jiaxing, Zhejiang 314000, P.R. China
    Copyright: © Zhu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 132
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    Published online on: December 10, 2020
       https://doi.org/10.3892/etm.2020.9564
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Abstract

Myocardial ischemia‑reperfusion injury (MIRI) has been confirmed to induce endoplasmic reticulum stress (ERS) during downstream cascade reactions after the sufficient deterioration of cardiomyocyte function. However, clinically outcomes have been inconsistent with experimental findings because the mechanism has not been entirely elucidated. Dexmedetomidine (DEX), an α2 adrenergic receptor agonist with anti‑inflammatory and organ‑protective activity, has been shown to attenuate IRI in the heart. The present study aimed to determine whether DEX is able to protect injured cardiomyocytes under in vitro hypoxia/reoxygenation (H/R) conditions and evaluate the conditions under which ERS is efficiently ameliorated. The cytotoxicity of DEX in H9c2 cells was evaluated 24 h after treatment with several different concentrations of DEX. The most appropriate H/R model parameters were determined by the assessment of cell viability and injury with Cell Counting Kit‑8 and lactate dehydrogenase (LDH) release assays after incubation under hypoxic conditions for 3 h and reoxygenation conditions for 3, 6, 12 and 24 h. Additionally, the aforementioned methods were used to assess cardiomyocytes cultured with various concentrations of DEX under H/R conditions. Furthermore, the degree of apoptosis and the mRNA and protein expression levels of glucose‑regulated protein 78 (GRP78), C/EBP homologous protein (CHOP) and caspase‑12 were evaluated in all groups. The addition of 1, 5 and 10 µM DEX to the cell culture significantly increased the proliferation of H9c2 cells by >80% under normal culture conditions. In the H/R model assessment, following 3 h of anoxia exposure, H9c2 cell viability decreased to 62.67% with 3 h of reoxygenation and to 36% with 6 h of reoxygenation compared with the control. The viability of H9c2 cells subjected to hypoxia for 3 h and reoxygenation for 3 h increased by 61.3% when pretreated with 1 µM DEX, and the LDH concentration in the supernatant was effectively decreased by 13.7%. H/R significantly increased the percentage of apoptotic cells, as detected by flow cytometry, and increased the expression levels of GRP78, CHOP and caspase‑12, while treatment with either DEX or 4‑phenylbutyric acid (4‑PBA) significantly attenuated these effects. Additionally, despite the protective effect of DEX against H/R injury, 4‑PBA attenuated the changes induced by DEX and H/R. In conclusion, treatment with 1 µM DEX alleviated cell injury, apoptosis and the increases in GRP78, CHOP and caspase‑12 expression levels in H9c2 cells induced by 3 h of hypoxia and 3 h of reoxygenation.
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Copy and paste a formatted citation
Spandidos Publications style
Zhu Z, Ling X, Zhou H and Zhang C: Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress. Exp Ther Med 21: 132, 2021.
APA
Zhu, Z., Ling, X., Zhou, H., & Zhang, C. (2021). Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress. Experimental and Therapeutic Medicine, 21, 132. https://doi.org/10.3892/etm.2020.9564
MLA
Zhu, Z., Ling, X., Zhou, H., Zhang, C."Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress". Experimental and Therapeutic Medicine 21.2 (2021): 132.
Chicago
Zhu, Z., Ling, X., Zhou, H., Zhang, C."Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress". Experimental and Therapeutic Medicine 21, no. 2 (2021): 132. https://doi.org/10.3892/etm.2020.9564
Copy and paste a formatted citation
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Spandidos Publications style
Zhu Z, Ling X, Zhou H and Zhang C: Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress. Exp Ther Med 21: 132, 2021.
APA
Zhu, Z., Ling, X., Zhou, H., & Zhang, C. (2021). Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress. Experimental and Therapeutic Medicine, 21, 132. https://doi.org/10.3892/etm.2020.9564
MLA
Zhu, Z., Ling, X., Zhou, H., Zhang, C."Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress". Experimental and Therapeutic Medicine 21.2 (2021): 132.
Chicago
Zhu, Z., Ling, X., Zhou, H., Zhang, C."Dexmedetomidine at a dose of 1 µM attenuates H9c2 cardiomyocyte injury under 3 h of hypoxia exposure and 3 h of reoxygenation through the inhibition of endoplasmic reticulum stress". Experimental and Therapeutic Medicine 21, no. 2 (2021): 132. https://doi.org/10.3892/etm.2020.9564
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