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甲硫 脑啡肽对脾交感神经活动的双向调节作用

 舒翠莉 林树新 贾 斌 张莉莉

  摘 要 目的:观察第三脑室微量注射甲硫-脑啡肽(met-enkephalin,Met-Enk)对脾交感神经放电活动的影响。方法:用urethane和α-chloralose麻醉的雄性Sprague-Dawley大鼠,于第三脑室分别微量注射Met-Enk 1μg和100μg。结果:脾交感神经放电活动的双向调节作用,即微量注射1μg Met-Enk时脾交感神经冲动数会减少,而注射100μg Met-Enk时脾交感神经冲动数会增多。事先静脉注射阿片受体阻断剂纳络酮(naloxone,Nal)均可以阻断这两种效应,但单独使用Nal对脾交感神经兴奋性没有影响。随脾交感神经冲动数的增多和减少,血压亦有一定程度的升高和降低,但体温无明显变化。结论:Met-Enk可以在中枢神经系统内通过阿片受体介导的通路调节脾交感神经的兴奋性。
  关键词 注射,脑室内;甲硫-脑啡肽,甲硫氨酸;脾;交感神经系统;纳络酮

Bidirectional modulation of splenic sympathetic nerve activity by methionine-enkephalin

SHU Cui-Li, LIN Shu-Xin, JIA Bin, ZHANG LI-LI
Department of Pathophysiology,Fourth Military Medical University,Xian(710033)

  Abstract AIM:To investigate the action of met-enkephalin(Met-Enk)injected into the third cerebral ventricle on splenic sympathetic nerve activity in this study.METHODS:Male Sprague-Dawley rats with urethane and α-chloralose anaesthesia were used.RESULTS:After microinjection of Met-Enk(1μg and 100μg respectively)into the third cerebral ventricle,we found that microinjection with 1μg Met-Enk into the third cerebral ventricle produced a depress on the splenic sympathetic nerve filaments,while 100μg Met-Enk produced an increase of the splenic sympathetic nerve filaments.This effect could be blocked by intravenous injection of opioid receptor antagonist naloxone(Nal),while Nal alone injected intravenously had no effect on the splenic nerve activity.The blood pressure changes with discharges of splenic nerve activity,while body temperature had no change.CONCLUSION:Met-Enk can modulate splenic sympathetic nerve activity through opioid receptors in the central nervous system.
  MeSH Injections,intraventricular;Enkephalin,methionine;Spleen;Sympathetic nervous system;Naloxone

  自从在中枢神经系统内发现脑啡肽以来,研究者们对其中枢作用做了多方面的研究,如甲硫-脑啡肽(met-enkephalin,Met-Enk)对催乳素、生长激素、血管加压素等分泌的调节,Met-Enk的中枢镇痛效应,以及Met-Enk通过中枢对呼吸、循环系统机能的调节。我们以前的工作表明[1,2],在第三

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