高温高湿环境颅脑火器伤后兔脑p38MAPK变化

目的 研究p38MAPK在高温高湿环境下颅脑火器伤后活化及其原因。方法 采用高温高湿颅脑枪伤模型,新西兰大白兔30只,随机分成常温[(22.0±0.5)℃、RH50%]对照组,高温高湿[(39.0±0.5)℃、RH80%~85%]枪伤后受热10和30min,1h、1.5h、2h组,每组5只。采用Westernblot检测脑匀浆p38MAPK活性,应用化学发光和X线片显示,凝胶图像分析仪半定量分析。结果 颅脑枪伤受高温高湿环境作用脑皮质和下丘脑的p38MAPK的活性受湿热后迅速增高,于受热1h达高峰,随后下降。下丘脑的p38MAPK活性比脑皮质高。结论 高温高湿环境颅脑火器伤后p38MAPK活性早期明显升高,参与了脑的继发性损害过程。

Changes of brain p38 MAPK in rabbits with craniocerebral gunshot injury in hot and humid environment

Objective To study the activation of p38 mitogen-activated protein kinase (MAPK) in the brain of rabbits after craniocerebral gunshot injury in a hot and humid environment (HHE) and explore its possible mechanism. Methods Craniocerebral gunshot injury model was established in 30 New Zealand white rabbits, which were subsequently exposed to environment of normal temperature (at 22.0±0.5℃ with relative humidity of 50%) or HHE at 39.0±0.5℃ with relative humidity of 80%-85% for 10 min, 30 min, 1 h, 1.5 h, and 2 h groups, respectively, with 5 rabbits in each group. p38 MAPK activity in the brain tissues of the rabbits following the injury and environmental exposure were detected by Western blotting and analyzed semi-quantitatively by Bio-Profil gel image analysis system. Results p38 MAPK activity in the cortex and hypothalamus was significantly elevated following gunshot injury and HHE exposure, reaching the peak level at 1 h of HHE exposure and then decreased. p38 MAPK activity was significantly higher in the hypothalamus than in the cortex. Conclusion p38 MAPK activity increases in the early stage following craniocerebral gunshot injury and HHE exposure in rabbits, the mechanism of which might involve the secondary brain insult.