异丙酚对内毒素血症鼠NO、SOD及MDA水平的影响

Effects of propofol on NO, SOD and MDA levels during endotoxic shock in rats

目的 研究异丙酚对内毒素血症大鼠体内一氧化氮(NO)、超氧化物歧化酶(SOD)、丙二醛(MDA)的影响。方法 72只Waster雄性大鼠随机分为三组,对照组(C组),内毒素组(L组)和异丙酚+内毒素组(P组)。L组腹腔内注入内毒素10mg·kg-1;P组皮下缓慢注入异丙酚20mg·kg-1·h-1后再注入内毒素10mg·kg-1;C组:腹腔内注入等量生理盐水。L组和P组在注射后30、90、180、360min取静脉血并处死动物(每时间点8只),C组在相应时间点留取3ml静脉血后,于360min处死大鼠留取肺组织。测定各时间点血清和肺组织中MDA和NO浓度及外周红细胞SOD活性。结果 P组用异丙酚后显著性降低内毒素血症大鼠血清和肺组织中NO和MDA浓度,并增加SOD活性,与L组比较差异有显著性(P<0.01或P<0.05)。结论 异丙酚可降低内毒素血症鼠NO水平,抑制MDA合成,增加SOD活性,具有一定的抗氧化作用,可改善内毒素血症鼠的功能状态。

Objective To investigate the effects of propofol on nitric oxide (NO), superoxide dismutase (SOD) and malondialdehyde (MDA) levels in blood and lung during endotoxic shock in rats.Methods Seventy-two male Wistar rats weighing 180-220 g were randomly divided into thiee groups :group Ⅰ control (C) ( n = 8) ; group Ⅱ endotoxic shock (L) ( n = 32) and group Ⅲ propofol + endotoxic shock (P) ( n = 32) . The animals were anesthetized with 3% pentobarbital 25 mg·kg-1 , tracheostomized and mechanically ventilated . Carotid and pulmonary artery were cannulated for MAP and MPAP monitoring. In group Ⅱ (L) and Ⅲ (P) endotoxin 10 mg·kg-1 was injected intraperitoneally. In group P 10 min before endotoxin administration subcutaneous propofol infusion was started at a rate of 20 mg·kg-1·h-1 . In control group normal saline(NS) was given ip instead of endotoxin. Venous blood samples were taken at 30, 90, 180 and 360 min after intraperitoneal endotoxin or NS injection. In group L and P 8 animals were killed at each time point respectively and in control group the 8 animals were killed at 360 min after ip NS injection. The lungs were immediately removed. Blood and lung NO and MDA levels and RBC SOD content were measured.Results The serum and lung NO concentration measured at all 4 time points were significantly lower in group Ⅲ than those in group n (P < 0.05 or 0.01) . The serum and lung MDA level measured at 90, 180 and 360 min in groupⅢwere significantly lower than those in groupⅡ( P < 0.05 or 0.01) . RBC SOD level in groupⅡand Ⅲ was significantly lower than that in control group but RBC SOD level in group Ⅲ was significantly higher than that in group Ⅱ ( P < 0.05) . Conclusion Propofol has antioxidative effect and can decrease NO concentration, inhibit synthesis of MDA and increase SOD activity during endotoxic shock, thus improving the function state.