大鼠三叉神经脊束间质核内接受内脏伤害性信息的含CB神经元向孤束核的投射

PROJECTION OF THE CALBINDIN D-28K NEURONS RECEIVING VISCERAL NOCICEPTIVE INFORMATION FROM INTERSTITIAL NUCLEUS OF THE SPINAL TRIGEMINAL TRACT TO NUCLEUS OF THE SOLITARY TRACT IN THE RAT

目的 探讨大鼠三叉神经脊束间质核 (INV)内接受内脏伤害性信息的含calbindinD 2 8K(CB)神经元与孤束核 (NTS)的投射联系。 方法 用福尔马林刺激上消化道 ,应用荧光金 (FG)逆行束路追踪结合Fos和CB的免疫荧光组织化学三重标记法。 结果 INV的背侧边缘旁核 (PaMd)和三叉旁核 (PaV)内可见到大量FG逆标细胞 ,以注射FG的同侧为主。大部分FG逆标细胞 (约 71 2 %)为CB免疫反应阳性。部分FG和CB双标记神经元(约 31 5 %)同时呈Fos免疫反应阳性的三重标记。 结论 INV内部分接受内脏伤害性刺激的CB神经元可直接投射至NTS ,含CB的神经元在内脏伤害性信息经INV向NTS的传导通路中 。

Objective To investigate the calbindin D\|28K (CB) neurons that receive the visceral nociceptive information in the interstitial nucleus of the spinal trigeminal tract (INV) directly project to the nucleus of the solitary tract (NTS). Methods Triple\|labeled methods of fluorogold (FG) retrograde tracing combined with Fos and CB proteins immunofluorescence histochemistry after formalin stimulating upper alimentary tract. Results Most of FG\|retrograde labeled neurons distributed in the paratrigeminal nucleus (PaV) and the dorsal paramarginal nucleus (PaMd) of INV ipsilateral to the FG injection. About 71\^2% of FG\|retrograde labeled neurons contained CB and 31\^5% of FG/CB double\|labeled neurons exhibited positive Fos\|immunoreaction in INV.Conclusion The results suggested that a part of neurons containing CB in INV receive the visceral nociceptive information and directly project to NTS. CB neurons might play an important role in transmitting visceral nociceptive information from INV to NTS. [