摘要
目的研究大鼠视神经钳夹伤后外侧膝状体神经元的早期损伤反应.方法用70g压力的显微无创血管钳夹持SD雄性大鼠右侧视神经30s,于损伤后2h、1d、3d、7d、14d,采用c-fos和calbindinD-28k抗体行免疫组化和荧光双标检测外侧膝状体中的c-fos定位,用Western印迹法检测外侧膝状体中的c-fos表达量.结果在损伤眼同侧的外侧膝状体腹侧核内侧核团和中间核可见c-fos阳性细胞,损伤后2h开始出现,1d时达到高峰,3d时稍有减少,7d时明显减少,14d仍有少量c-fos阳性细胞.外侧膝状体的背侧核及对照组未见c-fos阳性细胞.CalbindinD-28k阳性细胞主要出现在外侧膝状体的腹侧核内侧核团和中间核内.75%～83%的c-fos都出现在calbindinD-28k阳性细胞的胞核中.结论大鼠的视神经钳夹伤诱导了即早基因c-fos在同侧外侧膝状体腹侧核内侧核团和中间核calbindinD-28k阳性投射神经元中的表达,它们可能在视神经急性损伤的病理过程中起重要作用.(中华眼科杂志,2005,41:321-324)
Objective To investigate the early neuronal response to optic nerve crush in the lateral geniculate nucleus (LGN) of rats. Methods Unilateral optic nerve crush injury was produced in Sprague-Dawley rats by using micro clips of 70 gram forces. The rats were sacrificed at time periods of 2 hours, 1, 3, 7 and 14 days after crush. C-fos expression was studied with a polyclonal antibody by immunohistochemistry and Western blot. Double immunolabelling of c-fos and calbindin D-28k was also studied by confocal laser scanning microscope. Results Expression of c-fos was observed ipslaterally in the medial subdivision of ventral LGN and intermediate geniculate nucleus (IGN). The numbers of c-fos positive cells were visible at 2 h post injury and peaked at 1 d. Thereafter, the expression decreased at 3 d, 7 d and still a few was observed at 14 d. C-fos immunoreactivity was scarcely observed in the dorsal LGN and in the LGN of control rats. Expression of calbindin D-28k was mainly observed in the medial subdivision of ventral LGN and IGN. 75%～83% c-fos positive cells were also calbindin D-28k immunopositive. Conclusions Expression of c-fos was induced in calbindin D-28k positive relay neurons in the ipslaterally medial subdivision of ventral LGN and IGN. They may play some important roles during the pathologic process of acute optic nerve injury.
出处
《中华眼科杂志》
CAS
CSCD
北大核心
2005年第4期321-324,共4页
Chinese Journal of Ophthalmology
基金
上海市科委基金资助项目(044119607)
