预防给药对大鼠硫化氢吸入中毒肺脂质过氧化和抗氧化系统的影响

本文观察了DMAP、NaNO_2、VE、地塞米松、山莨菪碱对大鼠H_2S吸入中毒所致的肺脂质过氧化和天然抗氧化系统改变的预防作用。测定了H_2S中毒后6、12h肺组织及支气管肺泡灌洗液中的MDA,肺SOD,GSH和VE的含量。结果表明,给药组MDA含量显著低于中毒组,其中DMAP,VE和NaNO_2等组的MDA含量与正常无差异(但BALF中VE组,NaNO_2组含量高于正常对照水平,P<0.01)。各组SOD活性增强,GSH、VE的含量增加。上述结果提示这些药物均能在不同程度上降低H_2S中毒时肺自由基的含量。从而减轻因自由基含量升高而引起的肺损伤。提示DMAP,VE,NaNO_2,地塞米松,山莨菪碱等药对大鼠H_2S吸入中毒有预防作用,其中以DMAP,VE,NaNO_2的效果相对较好。

The effects of drug prevention on pulmonary lipid peroxidation and oxidation protectant system after H2S inhalation in rats

The preventive effects of some drugs on pulmonary lipid peroxi-dation and inborn oxidation protectant system in the lungs were observed in rats after the animals were exposed to 200 ppm of hydrogen sulfide (H2S) for 3 hours.Malondialdehyde (MDA) level of the lungs and bronchoalveolar lavage fluid (BALF),superoxide dismutase (SOD) activity,glutathione(GSH) and vitamin E (VE) levels of the lungs were determined in the 6th and 12th hour after H2S inhalation.It was found that a significant increase of MDA level of both the lungs and BALF and a significant decrease of SOD activity and GSH and VE level occured after a single exposure to 200 ppm of H2S inhalation.On the contrany,the MAD level of every group of which the animals had been medicated for prevention was lower than that of the intoxicated groups.Among the premedicated groups,the MDA level of 4-dimethylaminophenol(DMAP) group,VE group,and NaNO2 group was not different from that of the normal except that the MDA level in BALF was higher in VE and NaNO2 group than in the control.In every premedicated groups,SOD activity was increased and GSH and VE levels were elevated.These facts suggest that DMAP,NaNO2,VE,dexamethasone and anisoda-mine all could reduce the MDA level and elevate the capacity of the oxidation protectant system of the lungs after H2S inhalation.It is concluded that there are drugs to protect victims from H2O intoxication while DMAP,NaNO2 and VE are relatively more potent among the drugs used in this study.