巨噬细胞炎症蛋白2在脂多糖致大鼠脑水肿中的表达

Expression of Macrophage Inflammatory Protein 2 in Brain Edema Caused by Lioposacchride in Rats

目的探讨巨噬细胞炎症蛋白2(MIP2)在脂多糖(LPS)致大鼠脑水肿发病过程中的表达及纳洛酮对其干预作用。方法SD大鼠84只分3组,各28只,对照组(NS组)予0.2mL生理盐水颈内动脉注射;内毒素组(LPS组)颈内动脉注射LPS200μg;纳洛酮治疗组(NAL组)颈内动脉注射LPS后10min,1、2、6、12h及处死前2h腹腔注射纳洛酮1mg/kg。于不同时间点测定脑组织匀浆MIP2含量。干湿法测定脑组织含水量,甲酰胺法测定伊文思兰(EB)含量。结果LPS组脑组织含水量、EB含量显著高于NS组(P<0.01)。NAL组脑组织含水量和EB含量显著低于LPS组(P<0.01),但仍较NS组明显升高(P<0.01)。LPS组脑组织含水量与EB含量呈正相关(r=0.743P<0.01)。LPS组MIP2显著高于NS组(P<0.01)。NAL组MIP2显著低于LPS组(P<0.01)。结论MIP2参与脑水肿的发生发展,纳洛酮可抑制MIP2的生成,减轻脑水肿。

Objective To study the expression of macrophage inflammatory protein 2(MIP-2) and the interfering effects of naloxone in the brain edema caused by lioposacchride (LPS)in rats.Methods Eithty-four SD rats were randomly divided into 3 groups:normal saline group(NS group,n=28) 0.2 mL normal saline was injected by carotid into each rat;LPS group(n=28) with 200 μg LPS;naloxone interfering group(NAL group,n=28)1 mg/kg naloxone was intraperitoneally injected at 10 min,1,2,6,12 h and following LPS injected 2 h before decapitation.The content of MIP-2 and even blue(EB) in brain tissue were detected at different time point.The brain water content was measured by drying method.Results The content of water and EB in LPS group were significan higher than those in NS group(P<0.01).In NAL group, the content of water and EB were significant lower than those in LPS group(P<0.01),but obvious higher than those in NS group(P<0.01).In LPS group, water content and EB content were positively correlated(r=0.743 P<0.01).MIP-2 content was significant higher than those of other two groups(P<0.01).Conclusions MIP-2 can participate in the onset and development of brain edema induced on LPS.NAL has therapeutic effect on affecting the production of MIP-2.