摘要
目的 探讨白陶土联合普萘洛尔对百草枯（PQ）中毒小鼠肺组织基质金属蛋白酶-9（MMP-9）的影响及肺损伤的保护作用机制.方法 将54只ICR小鼠按随机数字表法分为对照组、PQ中毒模型组、治疗组,每组18只.采用100 mg/kg PQ灌胃的方法复制PQ中毒模型;制模后治疗组立即给予白陶土48 g/kg联合普萘洛尔3.2 mg/kg灌胃,对照组灌胃等体积生理盐水.制模后6、12、24 h处死小鼠,取肺组织用蛋白质免疫印迹试验（Western Blot）检测MMP-9蛋白表达水平并观察肺组织病理学变化.结果 制模后6 h对照组、PQ中毒模型组和治疗组MMP-9蛋白表达比较差异均无统计学意义（灰度值：0.655±0.045、0.656±0.045、0.641±0.036）,制模后12 h、24 h PQ中毒模型组MMP-9蛋白表达水平较对照组明显增多（12 h：0.824±0.039比0.634±0.038,24 h：0.742±0.039比0.658±0.041,均P〈0.05）,治疗组较PQ中毒模型组明显降低（12 h：0.760±0.050比0.824±0.039,24 h：0.686±0.041比0.742±0.039,均P〈0.05）.光镜下可见：PQ中毒模型组早期肺组织毛细血管扩张充血,12 h肺泡腔出现大量以中性白细胞为主的炎性细胞浸润,可见少量红细胞渗出;24 h可见肺泡壁毛细血管扩张、充血,内皮细胞肿胀,肺内小灶状或大片状炎性细胞浸润,以中性粒细胞为主.治疗组亦出现了肺炎性细胞、肺泡毛细血管扩张、充血,内皮细胞肿胀等表现,但程度较模型组明显减轻.结论 白陶土联合普萘洛尔干预能明显降低PQ急性中毒大鼠肺组织MMP-9的蛋白表达水平,可能是其防治PQ致肺损伤的机制之一.
Objective To explore the effect of Kaolin combined with propranolol on matrix metalloproteinase-9 （MMP-9） in lungs of paraquate （PQ） intoxicated mice and the mechanism of protection for lung injury. Methods Fifty-four ICR mice were randomly divided into three groups, 18 mice in each group： namely control group, PQ intoxicated group and treatment group. The PQ intoxicated model was replicated by intra-gastric administration （ig） of PQ 100 mg/kg; after intoxication, 48 g/kg Kaolin combined with 3.2 mg/kg propranolol intra-gastric administration was immediately given to the treatment group, while in the control group, the same volume of normal saline ig was applied. All the mice were sacrificed at 6, 12 and 24 hours after disposal, and the lung was harvested to test the protein expression level of MMP-9 by Western Blot, and the lung tissue pathological changes were observed.Results There was no statistical significance in the protein expression levels of MMP-9 among the control group, PQ intoxicated group and treatment group at 6 hours after disposal （grey value： 0.655±0.045, 0.656±0.045, 0.641±0.036）. The protein expression levels of MMP-9 in PQ intoxicated group were increased significantly compared with those in the control group at 12 hours and 24 hours after disposal （12 hours： 0.824±0.039 vs. 0.634±0.038, 24 hours： 0.742±0.039 vs. 0.658±0.041, both P 〈 0.05）, while the levels of treatment group were significantly lower than those in the intoxicated group （12 hours： 0.760±0.050 vs. 0.824±0.039, 24 hours： 0.686±0.041 vs. 0.742±0.039, both P 〈 0.05）. In PQ intoxicated group, early capillary dilation and congestion in lung tissue, a large number of inflammatory cells infiltration with mainly neutrophils in alveolar cavity and a small number of red blood cells exudation were seen at 12 hours; at 24 hours, capillary dilation at alveolar walls, congestion, swelling of endothelial cells, small flakes or large patches of inflammatory cell infiltration with mainly neutr
出处
《中国中西医结合急救杂志》
CAS
北大核心
2015年第5期478-481,共4页
Chinese Journal of Integrated Traditional and Western Medicine in Intensive and Critical Care
基金
浙江省温州市科技局资助项目（Y20110207）
