孤啡肽对创伤大鼠的免疫调节作用

目的:探讨孤啡肽及其受体在创伤大鼠的神经免疫调节作用.方法:采用免疫组织化学,原位杂交,及细胞因子的生物活性检测技术,定量分析内源性孤啡肽及其受体在中枢神经系统的表达及腹腔巨噬细胞分泌IL-1及TNF-α的能力.结果:在正常条件下,孤啡肽及孤啡肽受体mRNA免疫阳性细胞广泛分布于皮层、海马及下丘脑.而在创伤应激作用下,阳性细胞数明显减少.而另一方面,腹腔巨噬细胞分泌IL-1及TNF-α的能力却明显增强.将对照组的~3H掺入值及吸光度定为100％,则在创伤应激作用下,二者的活性分别增强至233％及521％(1:4),195％及566％(1:8),233％及757％(1:16),214％及622％(1:32).侧脑室注射三种剂量的孤啡肽(0.55nmol,0.55nmol,2.75nmol)对IL-1及TNF-α的活性均有显著的下调作用.而且孤啡肽(0.55nmol)的作用能被其受体拮抗剂所阻断.结论:孤啡肽及其受体,作为新的内阿片肽系统,参与创伤应激介导的免疫调节.

Immunomodulatory activity of orphanin FQ/nociceptin on traumatic rats

AIM: To explore the neuro-immune modulatory effect of orphanin FQ/nociceptin (OFQ) and opioid receptor like 1 (ORL1) receptor on the traumatic rats. METHODS: The quantitative method of immuno-cytochemistry and i n situ hybridization combined with cytokine bioassay were used to detect the expression of endogenous OFQ and ORL1 and the production of interleukin-1 (IL-1) and tumor necrosis factor-alpha (TNF-alpha) from peritoneal macrophage. RESULTS: Strong signals for both OFQ immuno-reactive cells and ORL1 mRNA were detected in cerebral cortex, hippocampus, and hypothalamus in normal condition, whereas they were significantly reduced after trauma (P<0.05). However, the production of IL-1 and TNF-alpha from peritoneal macrophage was increased, when expressed as percentage of enhancement, the increment attained to 233 % and 521 % (sample dilution 1:4), 195 % and 566 % (1:8), 233 % and 757 % ( 1:16), 214 % and 622 % (1:32), respectively, after trauma. After icv injection of OFQ at doses of 0.055 nmol, 0.55 nmol, and 2.75 nmol, the units of IL-1 and TNF-alpha were reversed (P<0.05); however, the action of OFQ (0.55 nmol) was blocked by ORL1 selective antagonist [phe1psi(CH2-NH)Gly2]nociceptin-(1-13)-NH2. CONCLUSION: OFQ and ORL1, the new opioid peptide system, are involved in the immune response elicited by traumatic stress.