重组人粒细胞集落刺激因子经鼻给药对脑梗死大鼠的脑保护作用

目的 探讨重组人粒细胞集落刺激因子(rhG-CSF)鼻腔给药对脑梗死大鼠的脑保护作用.方法 线栓法制备大鼠大脑中动脉阻塞模型,缺血2h再灌注,皮下及鼻腔给予 rhG-CSF(60 μg/kg).将动物分为正常组、假手术对照组、脑梗死组、脑梗死+皮下注射rhG-CSF组、脑梗死+经鼻生理盐水组、脑梗死+经鼻rhG-CSF组,每组6只.于术后3 d进行神经功能评分及FasL免疫荧光检测.结果 除正常组、假手术对照组外,其余各组动物均于术后出现不同程度的神经功能缺损,尤以脑梗死组、脑梗死+经鼻生理盐水组最为严重,神经功能评分最高[(10.20±1.85)分,(10.30±1.76)分],海马FasL阳性细胞数最多[(41.17±3.25)个,(41.00±2.76)个],差异无显著性( P ＞0.05),rhG-CSF皮下给药组大鼠神经功能评分降低[(5.67±1.32)分,P ＜0.01],海马FasL表达减少[(32.67±1.97)分,P ＜0.01],rhG-CSF经鼻给药组大鼠神经功能评分进一步降低[(4.00±0.93)分,P ＜0.05],海马FasL表达进一步减少[(19.50±1.05)个,P ＜0.01].结论 rhG-CSF经鼻给药能预防和修复脑梗死大鼠的神经功能缺损,通过抑制FasL表达发挥脑保护作用.

Neuroprotective effects of rhG-CSF on brain given intranasal in cerebral infarct rats

Objective To explore the protective effect of rhG-CSF given intranasally on cerebral infarct rats by observing the neurological dysfunction and the expression of Fas ligand (FasL) in hippocampus of cerebral infarct rats.Methods Middle cerebral artery occlusion(MCAO) model rats were established by nylon strand,reperfuse 2 hours later,and give rhG-CSF through subcutaneous and intranasal way.The rats were divided into the nermal group,the sham-operated control group(sham),MCAO group,MCAO+NS given intranasally group(NS),MCAO + rhG-CSF given subcutaneously group,and MCAO + rhG-CSF given intranasally group each group had 6 rats. At the time of 3d after reperfusion,neurological severity scores (NSS) test was performed and the expression of FasL was detected via immunohistochemical staining in collateral hippocampus. Results Neurological dysfunction appeared in all groups except for the normal and the sham group. The dysfunction of the MCAO and the NS group was the most serious,the NSS was the highest(10.20±1.85,10.30±1.76),the number of FasL positive cells was the most(41.17±3.25,41.00±2.76),and there was no obvious difference between the two groups ( P ＞0.05);the NSS and FasL positive cells decreased in the subcutaneous group(5.67±1.32,P ＜0.01;32.67±1.97,P ＜0.01) and decreased further more in the intranasal group(4.00±0.93,P ＜0.05;19.50±1.05,P ＜0.01).Conclusions rhG-CSF given intranasally can relieve the neurological dysfunction of cerebral infarct rats,and brain cells are thereby protected by resisting the expression of FasL.