大鼠延髓背角Ⅲ层深部内GFP基因重组病毒标记神经元的形态学特点

MORPHOLOGICAL FEATURES OF NEURONS LABELED BY GFP GENE RECOMBINANT VIRUS IN THE DEEP PART OF LAMINA Ⅲ OF THE RAT MEDULLARY DORSAL HORN

目的 观察大鼠延髓背角 (MDH)Ⅲ层深部内绿色荧光蛋白 (GFP)基因重组病毒标记神经元的形态学特点。 方法 将GFP基因重组病毒注入Ⅲ层深部后感染并标记神经元 ,标记结果用免疫组织化学染色显示 ,重塑后观察神经元形态。 结果 在远离注射区的MDHⅢ层深部可见少量单个GFP标记的神经元。根据GFP标记神经元的形态学特征 ,尤其是其轴突及其分支的特点 ,可将标记神经元分为投射神经元和中间神经元。投射神经元的轴突分支向Ⅲ层浅部、Ⅱ层和 或延髓网状结构延伸。中间神经元的轴突分支较密集且主要集中于Ⅲ层。 结论 根据GFP标记神经元的轴突及其分支特点 ,可将MDHⅢ层深部的神经元分为投射神经元和中间神经元 ;

Objective To observe the morphologic features of neurons labeled with green fluorescent protein (GFP) gene recombinant Sindibis virus in the deep part of lamina Ⅲ in the medullary dorsal horn (MDH) of the rat. Methods Neurons were infected and labeled with GFP gene recombinant Sindibis virus injected into lamina Ⅲ.Immunohistchemical staining showed the labeling results.The morphologic features of the GFP labeled neurons were revealed after reconstruction. Results A few GFP-labeled single neurons were found in the distal portions away from the virus injection site within the deep part of lamina Ⅲ of the MDH.According to the morphological features,especially their axons and axonal collaterals,GFP labeled neurons were classified into projection neurons and intrinsic neurons.The axons and their collaterals of the projection neurons entered to the superficial part of lamina Ⅲ,lamina Ⅱ and/or the medullary reticular formation.Most of the axons and their collaterals of the intrinsic neurons extended mainly within lamina Ⅲ.Conclusions According to the morphological features of axons and their axonal collaterals,GFP labeled neurons were classified into projection neurons and intrinsic neurons in the deep part of lamina Ⅲ of the MDH.GFP gene recombinant virus labeling technique is an effective method to investigate the morphological features of neurons.