大鼠脊髓背角浅层中γ-氨基丁酸能神经末梢与含NMDA样受体或蛋白激酶C样受体神经元之间突触联系的电镜研究
Electron microscopic study of synaptic relations of GABA-like immunoreactive terminals with NMDA receptor-like and-PKC-like immunoreactive neurons in superficial laminae of the rat spinal cord
摘要
本研究利用受体自显影方法探讨了孤啡肽 (nociceptin/orphaninFQ)在外周炎症和痛觉过敏中的调制作用。将完全弗氏佐剂 (CFA)注射到大鼠一侧后脚掌 2d、4d或 8d后 ,分别进行脊髓C4[3H]孤啡肽结合物的定量测定。放射自显影光密度测定分析表明 ,注射CFA 4d后的动物与对照组相比 ,两侧脊髓Ⅰ -Ⅱ层的中间和外侧区均有 [3H]孤啡肽结合物的明显增加 ;而X层中放射性结合物没有任何改变。生化研究证实 ,[3H]孤啡肽与大鼠脑片的特异性结合 [3H]孤啡肽受体的结合特征是一致的。以上结果提示 ,脊髓 [3H]孤啡肽受体在痛觉过敏期间发生了上调 ;该反应可能通过增强内源性镇痛机制以减弱CFA引起的痛觉过敏。
出处
《山西医科大学学报》
CAS
2000年第z1期63-67,共5页
Journal of Shanxi Medical University
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