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Role of adiponectin in diabetes myocardial ischemia-reperfusion injury and ischemic postconditioning

Cao, Chen; Liu, Hui-min; Li, Wei; Wu, Yang; Leng, Yan; Xue, Rui; Chen, Rong; Tang, Ling-hua; Sun, Qian; Xia, Zhongyuan; Tang, Qi-zhu; Shen, Di-fei; Meng, Qing-tao.
Acta cir. bras.; 35(1): e202000107, Mar. 23, 2020. ilus, tab, graf
Artigo em Inglês | VETINDEX | ID: vti-25792


Purpose Patients with diabetes are vulnerable to myocardial I/R (ischaemia/reperfusion) injury, but are not responsive to IPO (ischaemic post-conditioning). We hypothesized that decreased cardiac Adiponectin (APN) is responsible for the loss of diabetic heart sensitivity to IPO cardioprotecton. Methods Diabetic rats were subjected to I/R injury (30 min of LAD occlusion followed by 120 min of reperfusion). Myocardial infarct area was determined by TTC staining. Cardiac function was monitored by a microcatheter. ANP, 15-F2t-isoprostane, nitrotyrosine and MDA were measured by assay kits. Levels of p-Akt, total-Akt and GAPDH were determined by Western Blot. Results Diabetic rats subjected to myocardial IR exhibited severe myocardial infarction and oxidative stress injury, lower APN in the plasma and cardiac p-Akt expression ( P <0.05). IPO significantly attenuated myocardial injury and up-regulated plasma APN content and cardiac p-Akt expression in non-diabetic rats but not in diabetic rats. Linear correlation analysis showed that the expression of adiponectin was positively correlated with p-Akt and negatively correlated with myocardial infarction area ( P <0.01). Conclusion Protective effect of IPO was tightly correlated with the expression of adiponectin, exacerbation of I/R injury and ineffectiveness of IPO was partially due to the decline of adiponectin and inactivation of Akt in diabetes mellitus.(AU)
Biblioteca responsável: BR68.1
Localização: B68.1