Open Access

Dexmedetomidine attenuates hypoxia/reoxygenation injury in primary neonatal rat cardiomyocytes

  • Authors:
    • Ke Peng
    • Yun Qiu
    • Jian Li
    • Zhao‑Cai Zhang
    • Fu‑Hai Ji
  • View Affiliations

  • Published online on: June 1, 2017     https://doi.org/10.3892/etm.2017.4537
  • Pages: 689-695
  • Copyright: © Peng et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Systemic administration of dexmedetomidine provides cardioprotection against ischemia/reperfusion (I/R) injury; however, the direct effects of dexmedetomidine on cardiomyocytes have not been clarified. The present study investigated the effects of dexmedetomidine on primary neonatal rat cardiomyocytes under hypoxic/reoxygenation (H/R) conditions. In order to simulate in vivo I/R injury, primary neonatal rat cardiomyocytes were cultured under hypoxic conditions for 1 h and subsequently reoxygenated for 24 h. The effects of preconditioning with dexmedetomidine 2 h before hypoxia and postconditioning during reoxygenation were also examined. Cellular viability and activity were analyzed by monitoring the dynamic response profile of living cells using a real‑time cell analyzer system. A special scaled index, defined as the normalized cell index (NCI), was used to minimize the influence of inter‑experimental variations. The dose‑effect curve was generated from the area under the time‑course curve values of NCI. H/R exposure markedly decreased cell viability and activity. Furthermore, no cytotoxicity was associated with a clinically relevant concentration of dexmedetomidine. Preconditioning with dexmedetomidine concentration‑dependently ameliorated the reductions in NCI in cardiomyocytes following H/R injury. Additionally, postconditioning with dexmedetomidine improved the reductions in NCI at concentrations between 3 and 200 nM. Finally, the effect of 3‑40 nM dexmedetomidine postconditioning was greater than preconditioning. These results indicated that preconditioning and postconditioning with dexmedetomidine attenuated H/R injury in primary neonatal rat cardiomyocytes at the cellular level.
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July-2017
Volume 14 Issue 1

Print ISSN: 1792-0981
Online ISSN:1792-1015

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Spandidos Publications style
Peng K, Qiu Y, Li J, Zhang ZC and Ji FH: Dexmedetomidine attenuates hypoxia/reoxygenation injury in primary neonatal rat cardiomyocytes. Exp Ther Med 14: 689-695, 2017
APA
Peng, K., Qiu, Y., Li, J., Zhang, Z., & Ji, F. (2017). Dexmedetomidine attenuates hypoxia/reoxygenation injury in primary neonatal rat cardiomyocytes. Experimental and Therapeutic Medicine, 14, 689-695. https://doi.org/10.3892/etm.2017.4537
MLA
Peng, K., Qiu, Y., Li, J., Zhang, Z., Ji, F."Dexmedetomidine attenuates hypoxia/reoxygenation injury in primary neonatal rat cardiomyocytes". Experimental and Therapeutic Medicine 14.1 (2017): 689-695.
Chicago
Peng, K., Qiu, Y., Li, J., Zhang, Z., Ji, F."Dexmedetomidine attenuates hypoxia/reoxygenation injury in primary neonatal rat cardiomyocytes". Experimental and Therapeutic Medicine 14, no. 1 (2017): 689-695. https://doi.org/10.3892/etm.2017.4537