异丙酚对大鼠百草枯中毒的干预研究

目的探讨异丙酚对百草枯(Paraquat,PQ)中毒所致肺损伤的保护作用。方法128只雄性Wistar大鼠随机分为3组,对120只大鼠PQ 50 mg/kg一次性灌胃染毒,建立中毒大鼠肺损伤模型,异丙酚组(60只)于PQ染毒后1 h以二异丙酚腹腔注射10 mg/kg,2次/d,连续4d；染毒组(60只)于PQ染毒后1 h给予与异丙酚组等量的生理盐水；对照组(8只)1 ml/kg生理盐水一次性灌胃。于不同处理后1、3、7、14和28 d 5个时间点测定血浆、支气管肺泡灌洗液(bronchoalveolar lavage fluid,BALF)和肺组织匀浆中丙二醛(malondialdehyde,MDA)含量及肺组织匀浆中羟脯氨酸(hydroxyproline,HPY)含量,并观察3组大鼠中毒表现及肺组织病理改变。结果异丙酚组与染毒组比较,中毒表现明显减轻,血浆MDA含量1、3和7 d时分别为(4．31±0．94)、(4．04±0．87)、(3．24±1．14)nmol/ml,较对应染毒组[(10．15±3．15)、(6．97±1．65)、(5．44±0．66)nmol/ml]有明显降低,差异有统计学意义(P＜0．05或P＜0．01)；BALF中MDA含量1．3 d时分别为(3．47±1．09)、(2．79±1．11)nmol/ml,比染毒组[(5．58±1．19)、(4．86±1．89) nmol/ml]有明显降低,差异有统计学意义(P＜0．05或P＜0．01)；肺组织匀浆中MDA含量1、3 d时分别为(7．54±0．63)、(8．41±1．23)nmol/ml,较染毒组[(10．20±2．43)、(10．71±171)nmol/ml]有明显降低,差异有统计学意义(P＜0．06)。BALF中细胞计数1、3和7 d组明显低于染毒组,差异有统计学意义(P＜0．05)。病理观察异丙酚组肺组织水肿、充血及炎细胞浸润减轻。结论异丙酚能降低PQ中毒大鼠体内MDA含量,可能对PQ中毒大鼠肺损伤有保护作用。

Propofol protecting rats from paraquat induced lung injury

OBJECTIVE: To investigate the protective efficacy of propofol against paraquat induced lung injury. METHODS: One hundred and twenty-eight male Wistar rats were randomizedly divided into three groups: the control group (n = 8), the intoxication group (n = 60) and the propofol group (n = 60). One hundred and twenty rats were once administered with 5 mg/kg paraquat (PQ) by the intragastrical injection to establish the model of PQ induced lung injury. The propofol of 10 mg/kg was administered intraperitoneally in the propofol group (60 rats) twice a day for four consecutive days one hour after the rats were intoxicated while the normal saline of the same amount as propofol in the propofol group was administered in the intoxication group (60 rats) one hour after the rats were intoxicated. The intragastrical injection of 1 mg/kg normal saline was administered once in the control group (8 rats). On the first, the third, the seventh, the 14th and the 28th day after treating, the level of malondialdehyde (MDA) in plasma, bronchoalveolar lavage fluid (BALF) and lung homogenate, and the content of hydroxyproline (HPY) in lung homogenate, the cell count of BALF were detected. Meanwhile, pathological changes of lung were examined under optical microscope. RESULTS: The level of MDA in plasma on the first, the third and the seventh day and in BALF and lung homogenate on the first and the third day in the propofol group [in plasma: (4.31 +/- 0.94), (4.04 +/- 0.87) and (3.24 +/- 1.14) nmol/ml; in BALF: (3.47 +/- 1.09) and (2.79 +/- 1.11) nmol/ml; in lung homogenate: (7.54 +/- 0.63) and (8.41 +/- 1.23) nmol/ml] were significantly lower than those in the intoxication group [in plasma: (10.15 +/- 3.15), (6.97 +/- 1.6 5) and (5.44 +/- 0.66) nmol/ml; in BALF: (5.58 +/- 1.19) and (4.86 +/- 1.89) nmol/ml; in lung homogenate: (10.20 +/- 2.43) and (10.71 +/- 171) nmol/ml, P < 0.05 or P < 0.01]. The total cell count of BALF on the first, the third and the seventh day after intoxication in the propofol group was significantly less than that in the intoxication group respectively (P < 0.05). The histological changes such as alveolar edema, hemorrhage and inflammatory cell infiltration in the propofol group were less than those in the PQ group. CONCLUSION: Propofol could reduce the level of MDA and relieve paraquat induced lung injury.