Mechanism underlying inhibition of inflammatory responses induced by α7nAChR agonist postcondi?tioning alone or in combination with remote limb ischemic postconditioning during myocardial I∕R in rats: the relationship with GSK?3β
10.3760∕cma.j.issn.0254?1416.2013.08.024.
- VernacularTitle:α7nAChR激动剂后处理及其联合肢体远隔缺血后处理抑制大鼠心肌缺血再灌注时炎症反应的机制:与糖原合成酶激酶?3β的关系
- Author:
Xinlong CUI
1
;
Shiyu WANG
;
Fushan XUE
;
Guizhen YANG
;
Huixian LI
;
Yayang LIU
;
Xu LIAO
Author Information
1. 100144,中国医学科学院 北京协和医学院 整形外科医院麻醉科
- Keywords:
Myocardial reperfusion injury;
Inflammation;
Glycogen synthase kinase 3;
Cho?linergic agonists;
Extremities;
Ischemic postconditioning
- From:
Chinese Journal of Anesthesiology
2018;38(1):78-82
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the relationship between the mechanism underlying inhibition of inflammatory responses induced by α7 nicotinic acetylcholine receptor(α7nAChR)agonist postcondition?ing alone or in combination with remote limb ischemic postconditioning during myocardial ischemia?reperfu?sion(I∕R)and glycogen synthase kinase?3β(GSK?3β)in rats. Methods Eighty adult male Sprague?Dawley rats, aged 8 weeks, weighing 290-320 g, were divided into 4 groups(n=20 each)using a ran?dom number table: I∕R group, α7nAChR agonist postconditioning group(group P), remote limb ische?mic postconditioning group(group L)and α7nAChR agonist postconditioning plus remote limb ischemic postconditioning group(group P+L). Myocardial I∕R was induced by 30 min occlusion of the left anterior descending branch of coronary artery followed by 120 min reperfusion. Specific α7nAChR agonist PNU282987 2 mg∕kg was intravenously injected immediately before reperfusion in group P. In group L, limb ischemia was induced by tourniquet occlusion of bilateral hind paws for 10 min starting from 20 min of myocardial ischemia, and the tourniquet was released at the beginning of reperfusion. Combination of inter?vention measures previously described in P and L groups was performed in group P+L. Venous blood sam?ples were taken at 120 min of reperfusion for determination of serum troponin I(TnI)and creatine kinase?MB(CK?MB)concentrations, myocardial infarct size(IS)and expression of phosphorylated GSK?3β [p?GSK?3β(Ser536)], NF?κBp65 and phosphorylated nuclear factor?κBp65(p?NF?κBp65)in myocar?dial tissues(by Western blot). Results Compared with group I∕R, myocardial IS and serum cTnI and CK?MB concentrations were significantly decreased, the expression of p?GSK?3β(Ser9)in ischemic area was up?regulated, and the expression of p?NF?κBp65 in ischemic area was down?regulated in P, L and P+L groups(P<0.05). Compared with group L, myocardial IS and serum cTnI and CK?MB concentrations were significantly decreased, the expression of p?GSK?3β(Ser9)in ischemic area was up?regulated, and the expression of p?NF?κBp65 in ischemic area was down?regulated in group P+L(P<0.05). Conclusion The mechanism by which α7nAChR agonist postconditioning alone or in combination with remote limb is?chemic postconditioning inhibits inflammatory responses during myocardial I∕R may be related to inhibiting GSK?3β activity in rats.
