5-羟色胺和生长抑素对P物质及慢痛引起的脊髓背角神经元电活动的影响

本研究用多管微电极细胞外记录和离子微电泳方法，以Wistar大鼠为实验对象，观察了P物质（SP）对脊髓背角神经元自发放电和慢性伤害性痛放电的影响以及与5-羟色胺（5－HT）和生长抑素（SOM）的关系。结果表明：（1）电泳SP可使脊髓背角神经元单位放电增多。（2）电泳SP又可抑制福尔马林（Formalin）引起的神经元慢性伤害性痛放电。（3）电泳5－HT和SOM可抑制SP及慢痛诱发的脊髓背角神经元放电。上述结果提示：在痛觉调制过程中，脊髓内SP起着传递痛觉信息和镇痛的双重作用，5－HT和SOM可通过抑制SP的效应，参与痛觉调制。

Effect of 5-HT and Somatostatin on SP and Chronic Pain Initiated Electrical Activity of Neurons in Spinal Dorsal Horn

The effects of SP on the electric activities of neurons of spinal dorsal horn and the influence of 5-HT, somatostat in (SOM ) on the effects of SP were observed in anesthet ized rats with multimicropipeteand iontophoresis techniques. It was found that. (1 ) The m icroiontop horetically administrating of SPcould increase spinal dorsal horn unit discharge. (2) The noxious electrical activity of neurons inducedby formalin could be inhibited by microiontophoretically applied SP. (3 ) The mi croiontophoretically ad -ministrating of 5-HT and SOM could inhibit the SP and formalin evoked unit discharge of neurons inspinal dorsal horn. It was suggested that SP took a double-effect part in modulation of pain transmissionand analgesia in spinal cord, 5-HT and SOM inhibited the effect of SP and participated in pain modula-tion of SP.