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大鼠脑缺血 再灌注损伤诱导IL 1 的表达 |
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张 岚 李向红 谷志远 赵亚力 郝好杰
摘 要 目的:研究脑缺血-再灌注损伤早期大鼠脑组织中IL-1β的表达及其与中性粒细胞浸润的关系。方法:应用反转录多聚酶链反应(RT-PCR)检测IL-1β mRNA,并用图象处理系统对正常、缺血及再灌注后不同时间的IL-1β mRNA进行相对定量分析;采用MTT和MPO方法分别对大鼠脑组IL-1β的多肽活性及浸润的中性粒细胞进行检测。结果:单纯脑缺血IL-1β表达不增加;再灌注2 h,IL-1β mRNA表达量明显增加,再灌注3 h,脑组织中IL-1多肽活性显著升高;再灌注9 h,中性粒细胞粘附到微血管壁并浸润到周围脑组织中。结论:脑缺血-再灌注损伤早期即有IL-1β mRNA的表达并伴有相应活性多肽的合成分泌,与再灌注损伤后期的白细胞浸润密切相关。 主题词 脑;局部缺血;再灌注;白细胞介素1
Brain ischemia-reperfusion injury induces IL-1β expression in rats
ZHANG Lan,LI Xiang-Hong,GU Zhi-Yuan,ZHAO Ya-Li,HAO Hao-Jie Lab of Microcirculation,Lab of Molecular Biology,PLA General Hospital,Beijing(100853)
Abstract AIM:To detect the expression of endogenous IL-1β in the rat brain during brain ischemia-reperfusion injury and study its relationship with the infiltration of polymorphonuclear leukocytes.METHODS:IL-1β mRNA content were measured with reverse transcription followed by polymerase chain reaction amplification (RT-PCR).Tissue IL-1 peptide activity was detected by MTT bioassay.The number of infiltrated polymorphonuclear neutrophil was quantitatively studied with MPO activity measurement.RESULTS:Ischemia alone did not lead to increased expression of IL-1β.At 2 h of reperfusion IL-1β mRNA increased markedly.After 9 h of reperfusion leukocytes adhered to microvascular walls and migrated into surrounding brain tissue.CONCLUSION:Rapid expression of IL-1β at early period of brain ischemia-reperfusion injury is closely related to the pathologic development of brain injury. MeSH Brain; Ischemia; Reperfusion;IL-1β
IL-1β是多功能的细胞因子,在正常中枢神经系统发育和脑对各种损伤的反应中有重要的作用[1]。IL-1β的生物学作用包括刺激其它细胞因子和可溶性损伤介质的合成、诱导白细胞浸润、影响胶质细胞的基因表达等。研究说明[2],IL-1β与脑缺血-再灌注损伤有关。本实验的目的在于研究脑缺血-再灌注早期IL-1β的表达及其与中性粒细胞浸润的关系。
材料与方法 (一)动物模型的复制:参照Bannister[3]方法。雄性Wistar大鼠,平均体重250g(n=60)。钳夹右侧颈总及颈内动脉,行左侧颈总动脉远心端及颈静脉近心端插管并连接两管造成缺血。缺血60m[1] [2] 下一页 上一个医学论文: 不同pH及封闭氨基端对甘氨酸拮抗内毒素作用的影响 下一个医学论文: 造血生长因子促进RV介导LacZ NeoR基因在人骨髓造血细胞中转染的机制
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