国际麻醉学与复苏杂志   2010, Issue (3): 203-206
    
七氟烷预处理对缺血/再灌注损伤大鼠心肌磷酸化抑制蛋白的影响
吴雪梅 刘霞 王琛 谢红1()
1.215004, 苏州大学附属第二医院麻醉科(吴雪梅、 刘霞、王琛、 谢红)
Effects of sevoflurane preconditioning on p-IκBα in a rat model of myocardial ischemia- reperfusion
 全文:
摘要:

目的 观察七氟烷预处理对缺血/再灌注(ischemia/reperfusion,I/R) 损伤大鼠心肌磷酸化抑制蛋白 (phosphorylation inhebitory kappaB,p-IκBα )的影响, 从另一角度进一步探讨NF-κB在七氟烷预处理中的保护机制。 方法 SD 雄性大鼠 56 只,建立大鼠心肌 I/R 损伤在体模型, 随机分为 7 组: 假手术组(CON 组);单纯缺血组 (I/R 组)进行 30 min 心肌缺血后再灌注 120 min; 七氟烷组(SEVO 组)于吸入 1.0 MAC 七氟烷 30 min,继之15 min 药物排出后进行心肌 I/R; SEVO 165’ 组吸入七氟烷 30 min 后停止吸入165 min; 小白菊内酯 (parthenolide,PTN)组于缺血前 60 min 腹腔内注射 特异性抑制剂 PTN 500 ug/kg;PTN+SEVO组、 SEVO+PTN 组分别于七氟烷预处理前 15 min、预处理后即刻腹腔内注射 PTN 500 ug/kg。分别于大鼠心肌I/R前、后或相应时间点取心肌标本,采用 Western blotting 法测定p-IκBα 的蛋白表达。 结果 缺血前即刻: SEVO 组(22±3) 和 SEVO 165’ 组 (20±4)较 CON 组 (15±3) p-IκBα 蛋白表达上调 (P<0.05) ; 再灌注 2h 后即刻: I/R 组 (44±6) 和 SEVO 组 (30±3)较CON 组 (15±4)p-IκBα 蛋白表达均上调 (P<0.05),而与 I/R 组相比,SEVO 组 p-IκBα 蛋白上调幅度减小 (P<0.05) 。 结论 七氟烷预处理早期p-IκBα 蛋白的表达上调, 反馈性抑制了 I/R 后p-IκBα 蛋白的表达,该作用可被 PTN 所阻断。从另一角度进一步论证了NF-κB 参与七氟烷预处理的心肌保护机制。

关键词: 麻醉药, 吸入;心肌再灌注损伤;预处理;磷酸化抑制蛋白
Abstract:

Objective To observe the effect of sevoflurane preconditioning on the expression of p-IκBα in a rat model of myocardial ischemia- reperfusion (I/R) . Methods Eighty-four male SD rats after setting up the model of I/R, randomly were divided into seven groups:(1) Control group;(2) Simple-Ischemic group received 30 min I/R merely;(3) SEVO group inhaled 1.0 MAC sevoflurane for 30 min and 15 min wash-out followed by a 30 min I/R;(4) SEVO 165’group inhaled 1.0 MAC sevoflurane for 30 min and then stoped for 165 min;(5)PTN group received PTN 500 ug/kg (NF-κB inhibitor)intraperitoneally 60 min before I/R; (6) PTN+SEVO group and (7)SEVO+PTN group received PTN 500 ug/kg 15 min before and after sevoflurane preconditioning. Myocardium sample of all groups were collected before and after the time of I/R or the corresponding point in time.p-IκBα was determined by Western Blotting. Results The expression of p-IκBα was significantly up-regulated in SEVO group (22±3) and SEVO 165’ group (20±4)than that in Control group(15±3)before I/R (P<0.05) ; After perfusion the expression of p-IκBα in Simple-Ischemic group (44±6) and SEVO group (30±3) was significantly up-regulated than that in Control group (15±4, P<0.05) ; but the up-regulated adjustment of SEVO group was smaller than that in Simple-Ischemic group(P<0.05) . Conclusion This study further confirmed NF-κB participates in the I/R injury and it may play an important role in the mechanism of sevoflurane-induced cardioprotection.

Key words: Anaesthetic, Inhalation; Myocardial reperfusion injury; Preconditioning;p-IκBα