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

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

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)样阳性终末与 PAG和 PV共存神经元之间的联系。 方法 免疫荧光组织化学双重和三重染色技术 ,在激光共聚焦显微镜下观察。 结果 在 Vm e内可见大量 PAG样和 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样免疫反应 ,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样或 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 在面口部本体感觉信息由 Vme向更高一级神经元传递的过程中 ,PV可能和谷氨酸一起发挥着重要的作用 ,与此同时 Vm e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。

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.;