大鼠三叉神经中脑核内PPD、PPE样阳性终末与PAG和PV共存神经元的联系

目的：观察大鼠三叉神经中脑核（Vme)神经元内磷酸激活的谷氨酰胺酶（PAG）和小白蛋白（PV）的共存关系,以及前强啡肽原（PPD）样和前脑啡肽原（PPE）样阳性科末与PAG和PV共存神经元之间的联系。方法和PV样免疫反应神经元,吻尾方向上几乎在其全长出现,多为大的假单极神经元,许多PAG样阳性神经元同时呈PV燕免疫反应,双标细胞占全部标记细胞的95％以上,在激光共聚焦显微镜下观察到,少量PPD或PPE样阳性终末围绕在PAG样和PV样双重标记的Vme神经元胞体周围,并与之形成密切接触,结论：在面口部本体感觉住处由Vme向更高一级神经元的过程中,PV可能和谷氨酸一起发挥着重要的作用,与此同时Vme神经元还可能接受中枢内强啡肽样和脑啡肽样神经终末对它的调控。

CONNECTIONS BETWEEN THE PREPRODYNORPHIN-,PREPROEN- KEPHALIN-LIKE IMMUNOREACTIVE TERMINALS AND COEXISTENT NEURONS OF THE PHOSPHATE ACTIVATED GLUTAMINASE AND PARVALBUMIN IN THE MESENCEPHALIC TRIGEMINAL NUCLEUS OF THE RAT

Objective To observe the co-localization of phosphate activated glutaminase(PAG) and parvalbumin(PV) in neurons,and the connections between preprodynorphin-like immunoreactive(PPD-LI) or preproenkephalin(PPE)-LI terminals and coexistent neurons of PAG-LI and PV-LI in the mesencephalic trigeminal nucleus(Vme) of the rat. Methods In the present study,the immunofluorescence histochemical double-staining and triple-staining technique were used.The staining results were observed under a confocal laser scanning microscope. Results Many neuronal cell bodies through the whole rostrocaudal extent of Vme showed PAG-LI and PV-LI.The majority of them were large pseudounipolar neurons.A considerable number of PV-LI neurons expressed PAG-LI,cell counts showed that more than 95% of PV-I neurons were immunostained with PAG-LI.Confocal laser scanning microscope further revealed that axonal varicosities with PPD-LI or PPE-LI were found to make close contact with neuronal cell bodies of Vme showed both PAG-LI and PV-LI. Conclusion The present results indicated that the glutamate and PV are involved in the transmission of the trigeminal proprioceptive sensory singals from the Vme to the higher centers,simultaneously,dynorphin-and enkephalin-immuoreactive terminals may also exert modulatory influence on the primary afferent cell bodies of the Vme.;