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Article

An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats

  • Authors:
    • Guoming Zhang
    • Yuanyuan Sun
    • Yu Wang
    • Jing Bai
    • Tiande Li
    • Xiaoyan Li
    • Shaoping Su
    • Xiuhua Liu
  • View Affiliations / Copyright

    Affiliations: Department of Cardiology, General Hospital of Jinan Military Command, Jinan, Shandong 250031, P.R. China, Department of Ultrasound, General Hospital of Jinan Military Command, Jinan, Shandong 250031, P.R. China, Institute of Geriatric Cardiology, Chinese PLA General Hospital, Beijing 100853, P.R. China, Department of Cardiology, Cardiovascular Institute, Chinese PLA General Hospital, Beijing 100853, P.R. China, Outpatient Department of Geriatrics, Chinese PLA General Hospital, Beijing 100853, P.R. China, Department of Pathophysiology, Chinese PLA General Hospital, Beijing 100853, P.R. China
  • Pages: 696-702
    |
    Published online on: June 25, 2013
       https://doi.org/10.3892/mmr.2013.1544
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Abstract

The aim of the present study was to investigate whether a gradually increasing reperfusion algorithm, in which the brief reperfusion was lengthened as the duration of each reperfusion/reocclusion cycle remained fixed, enhances cardioprotection. Rats were randomized into 5 groups: the sham, reperfusion injury (R/I), gradually decreased reperfusion (GDR; 30/10‑25/15‑15/25‑10/30 sec of reperfusion/reocclusion), equal reperfusion (ER; 4 20/20‑sec reperfusion/reocclusion cycles) and gradually increased reperfusion (GIR; 10/30‑15/25‑25/15‑30/10 sec of reperfusion/reocclusion). The rats were sacrificed to measure serum markers, apoptotic indices and infarct size. Western blot analyses were used to analyze the expression of molecules involved in important signaling pathways. All the three postconditioning patterns were found to provide cardioprotection (P<0.05 compared with the R/I group). GIR provided optimum cardioprotection, followed by ER and then GDR. Apoptotic index and serum marker levels were significantly reduced in the GIR compared with the ER group (P<0.05). The enhanced cardioprotection provided by GIR was accompanied by significantly increased levels of extracellular signal-regulated kinase 1/2 (ERK1/2) phosphorylation and Bcl‑2, as well as lower levels of p38/c‑Jun N‑terminal kinase (JNK) phosphorylation, tumor necrosis factor α (TNFα), caspase‑8, Bax, caspase‑9 and cytochrome c (Cyt‑c) in the cytoplasm of rats (P<0.05, all compared with ER). The infarct size in the rats of the GIR group was also smaller compared with that in the rats of the ER group, but this difference was not significant (16.30±5.22 vs. 20.57±6.32%, P>0.05). All the variables measured in the present study were significantly improved in the GIR group compared with the GDR group (P<0.05). In conclusion, the association between brief reperfusion and reocclusion is an important factor in postconditioning algorithms. Additionally, GIR results in improved cardioprotection compared with that achieved by the remaining algorithms examined.
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Copy and paste a formatted citation
Spandidos Publications style
Zhang G, Sun Y, Wang Y, Bai J, Li T, Li X, Su S and Liu X: An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats. Mol Med Rep 8: 696-702, 2013.
APA
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X. ... Liu, X. (2013). An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats. Molecular Medicine Reports, 8, 696-702. https://doi.org/10.3892/mmr.2013.1544
MLA
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X., Su, S., Liu, X."An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats". Molecular Medicine Reports 8.2 (2013): 696-702.
Chicago
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X., Su, S., Liu, X."An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats". Molecular Medicine Reports 8, no. 2 (2013): 696-702. https://doi.org/10.3892/mmr.2013.1544
Copy and paste a formatted citation
x
Spandidos Publications style
Zhang G, Sun Y, Wang Y, Bai J, Li T, Li X, Su S and Liu X: An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats. Mol Med Rep 8: 696-702, 2013.
APA
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X. ... Liu, X. (2013). An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats. Molecular Medicine Reports, 8, 696-702. https://doi.org/10.3892/mmr.2013.1544
MLA
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X., Su, S., Liu, X."An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats". Molecular Medicine Reports 8.2 (2013): 696-702.
Chicago
Zhang, G., Sun, Y., Wang, Y., Bai, J., Li, T., Li, X., Su, S., Liu, X."An improved postconditioning algorithm: Gradually increased reperfusion provides improved cardioprotection in rats". Molecular Medicine Reports 8, no. 2 (2013): 696-702. https://doi.org/10.3892/mmr.2013.1544
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