大鼠脑内星形胶质细胞对低血压的反应及其与神经元的关系

RESPONSE OF ASTROCYTES TO HYPOTENSION IN RAT AND ITS RELATIONSHIP WITH NEURONS

目的 观察大鼠血压降低后脑内星形胶质细胞 (AS)和神经元的反应及其相互关系。 方法 硝普钠静脉注射制作瞬间低血压模型 ,用抗Fos、抗GFAP和抗TH三重标记免疫组织化学方法 ,观察GFAP和Fos表达和分布规律及其与TH阳性神经元的关系。 结果 在脑内血压调节相关区域均出现GFAP和Fos表达 ,两者部位一致 ,且有亚核分布特点 ;在延髓和蓝斑等部位Fos或TH单标 ,或Fos与TH双标阳性神经元周围有GFAP阳性纤维包绕 ,形成 3种形式的复合体样结构。 结论 AS对血压变化反应敏感 ,并具机能定位特异性 。

Objective To observe the response and relationship between astrocytes and neurons to hypotension rats. Methods Transient hypotension animal models were induced by injecting sodium nitroprusside. The expression, distribution and relationship pattern of Fos-、GFAP- or TH- positive reaction in rat brain were studied with a triple method combining anti\|GFAP, Fos and TH immunohistochemical staining. Results Fos and GFAP positive staining appeared in some brain regions related with blood pressure regulation. The distribution of GFAP\|positive astrocytes was similar to that of Fos\|positive neurons. Fos\|and GFAP\|positive neurons exhibited clear character of nuclei and subnuclei distribution. Many FOs and TH single labeled neurons, or Fos and TH double labelled neurons in medulla oblongata and locus coeruleus arounded by GFAP positive processes were found and formed three kinds of complex\|like structures. Conclusion\ The present results indicated that the astrocytes were sensentive to the changes of blood pressure. The distribution of astrocytes had the specificity of functional location. We suggestal that the astrocytes and neurons might be involved together in information precessing within brain.\;[