Spantide抑制大鼠甲醛试验中脊髓中央管周围区域NOS表达的上调(英文)

目的：本实验观察非选择性NK受体拮抗剂［D-Arg1, D-Trp7,9, Leu11］-substance P (spantide)对大鼠甲醛实验诱导的脊髓中央管周围灰质区域NOS表达的影响。 方法： 右后掌足底皮下注射甲醛(5%，0.2 mL)诱导持续性痛及痛过敏，用缩足反射实验测定大鼠痛反应。应用NADPH-d组织化学法观察NOS的表达。Spantide于甲醛注射前5 min经L5-L6腰椎间隙鞘内注射。 结果： (1)足底注射甲醛引起大鼠疼痛行为反应，包括抓、咬、舔、注射侧后爪抬离盒底等。伴随着这些行为反应，脊髓L5节段中央管周围灰质区(第X板层)NOS表达上调。(2)预先给予spantide能抑制大鼠甲醛试验第二时相注射侧肢体的自发性退缩反射，同时抑制了脊髓中央管周围灰质区NOS表达的上调。 结论： SP在大鼠甲醛试验中脊髓中央管周围区域NOS表达上调中起着重要的作用。

Spantide inhibits up-regulation of NOS in the pericentral canal region of the spinal cord in the rat formalin test

AIM: The present study was designed to observe the effect of [D- Arg1, D- Trp7,9, Leu11] - substance P (spantide), a non- selective antagonist of NK receptors, on the up- regulation of nitric oxide synthase (NOS) induced by formalin test. METHODS: Formalin (5%, 0.2 mL) was subcutaneously injected into the plantar side of the right hind paw to produce persistent pain and hyperalgesia. The pain response was determined by spontaneous flinch reflex test. NOS expression was examined using NADPH- d histochemical staining. Spantide was intrathecally injected via L5 - L6 intervertebral space 5 min prior to the formalin injection. RESULTS: Injection of formalin resulted in a characteristic behavioral response consisting of vigorous scratching, biting, licking and lifting of the injected hind paw from the box' s bottom. Following these behavioral responses, the NOS expression was up- regulated in the pericentral canal region of the L5 segment of the spinal cord. Pre- treatment with spantide depressed the spontaneous flinches of the injected paw in the second phase of the formalin test. At the same time, the upregulation of NOS was substantially inhibited. CONCLUSION: It might be concluded that substance P played an important role in the up - regulation of NOS in the pericentral canal region of the spinal cord in the formalin test.