• 1. Department of Cardiovascular Surgery, Qingdao Municipal Hospital, Medical College of Qingdao University, Qingdao, 266071, Shandong, P.R.China;
  • 2. Pharmacy Department, Qingdao Cancer Hospital, Medical College of Qingdao University, Qingdao, 266042, Shandong, P.R.China;
SUN Long, Email: sw8011@126.com
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Objective To determine the anti-apoptosis effects of heme oxygenase-1 (HO-1) on lung injury after cardiopulmonary bypass (CPB), and to investigate its probable mechanisms. Methods A total of 144 male Wistar rats with wight of 250-350 g were divided into 3 groups: group A (control group), group B (cobalt protoporphyrin, CoPP), and group C [CoPP and zinc protoporphyrin (ZnPP)] randomly. A modified rat model of CPB-induced lung injury was established. And then the lung tissues were taken at different times for the relevant indicators test: before CPB (T0), immediately after CPB (T1), 2 h after CPB (T2), 6 h after CPB (T3), 12 h after CPB (T4), and 24 h after CPB (T5). The expression of HO-1 and Bcl-2 protein in each group was tested by immunohistochemistry, and cell apoptosis by TUNEL. Results The HO-1 protein expression in group B was significantly higher than that in groups A and C at any given time point, so was the HO-1 activity (P<0.05). There was no significant difference in Bcl-2 expression of lung tissue before CPB among each group (P>0.05). The Bcl-2 protein reduced gradually after CPB. The expressions of Bcl-2 protein in group B at all time points after bypass were significantly higher than that in groups A and C (P<0.05). The apoptosis index (AI) showed no significant difference before CPB in each group (P>0.05), and increased gradually after CPB. AI in group B at any time point after bypass was lower than that in groups A and C (P<0.05). The HE staining results showed that the damage of lung tissue in group B obviously reduced compared with groups A and C. Conclusion CoPP can induce a large amount of HO-1 expression in the lung tissue, and it is still highly expressed after CPB. So it plays an important role in anti-apoptosis through the up-regulation of Bcl-2 protein expression.

Citation: SHENG Wei, WANG Haitao, CHI Yifan, SUN Long, NIU Zhaozhuo, LIN Mingshan, QIAO Youjin, WU Jiantao. Anti-apoptosis effect and mechanism of heme oxygenase-1 on lung injury after cardiopulmonary bypass. Chinese Journal of Clinical Thoracic and Cardiovascular Surgery, 2017, 24(5): 384-389. doi: 10.7507/1007-4848.201610033 Copy

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