巴曲酶对实验性脑出血大鼠的神经保护作用

Neuroprotective effect of batroxobin on experimental intracerebral hemorrhage in rats

本文旨在观察巴曲酶对大鼠脑出血后神经损伤是否具有保护作用及其可能作用机制。将大鼠分为假手术组、模型组、巴曲酶(4、8及16BU·kg-1)组及尼莫地平阳性对照组,在脑立体定向仪上,根据大鼠脑立体定位图谱定位脑部尾状核后,用微量注射器向尾状核注射VII型胶原酶,建立大鼠脑出血模型。术后进行大鼠神经行为学评分及电镜下观察脑组织病理形态学改变;干湿重法测定脑含水量;试剂盒测定超氧化物歧化酶(SOD)活力和丙二醛(MDA)含量;荧光分光光度计法测定神经细胞内游离钙离子浓度([Ca2+]i)。结果表明,巴曲酶可改善脑出血大鼠的神经行为学评分,减轻其脑组织细胞水肿和出血程度;使脑含水量、MDA含量及[Ca2+]i下降,SOD活力升高,提示巴曲酶对脑出血后神经损伤可能存在保护作用,其作用机制可能与减轻脑水肿、提高SOD活力和降低MDA含量及抑制钙超载有关。

This study is to investigate if batroxobin has the protective effect against nerve injury caused by cerebral hemorrhage in rats and its possible mechanism. Animals were divided into sham group, model group, batroxobin 4, 8, and 16 BU·kg^-1 groups and nimodipine positive control group. On the brain stereotaxic apparatus, the rat intracerebral hemorrhage model was established by injecting collagenase with microinjector into the brain caudate nucleus which was located according to the brain stereotaxic atlas. Neuroethology of the rats was estimated. The brain tissue pathomorphology was observed with electron microscope. The water content of the brain tissue was quantitated with wet/dry weight measurement. SOD and MDA were determined according to the kit procedure, and free Ca^2＋ concentration in neurocyte was measured by fluorospectrophotometer. As shown in results, batroxobin could improve neuroethology scale of the rats, relieve histiocyte edema and bleeding degree. The water content of the brain tissue, MDA and free Ca^2＋ concentration were reduced and SOD activity was raised in batroxobin treatment groups. Therefore, it is possible that batroxobin has some protective effect against nerve injury caused by cerebral hemorrhage in rats, and its mechanism maybe relate to lessening brain edema, reducing MDA content, raising SOD activity, and inhibiting calcium overload.