• Acta Pharmacol. Sin. · Nov 2001

    Analgesic effect of endomorphin-1.

    • Z H Li, L D Shan, X H Jiang, S Y Guo, G D Yu, T Hisamitsu, and Q Z Yin.
    • Department of Physiology, School of Medicine, Showa University, Tokyo 142, Japan.
    • Acta Pharmacol. Sin. 2001 Nov 1;22(11):976-80.

    AimTo study the analgesic effect of endomorphin-1 (EM-1).MethodsThe experiment was performed in rats and mice to study the analgesic effect of intraperitoneal (ip) injection of EM-1 with tail stimulation-vocalization test, writhing test, adjuvant arthritis, and neuropathic pain model and to compare it with the analgesic effects produced by intracerebroventricular (icv) and intrathecal (it) administrations.Results1) EM-1 raised the pain threshold dose-dependently in tail stimulation-vocalization test in rats and inhibited the writhing responses induced by ip acetic acid in mice. EM-1 also decreased the hyperalgesia in both adjuvant arthritis and neuropathic pain model. 2) The analgesic effect induced by central (icv and it) administration of EM-1 was faster and more powerful than that induced by peripheral (ip) administration. 3) The analgesic effect of EM-1 was reversed by naloxone (opioid receptor antagonist), as well as by cyprodime (mu-opioid receptor selective antagonist). Repeated administrations of EM-1 induced tolerance.ConclusionEM-1 had a definite analgesic effect and the analgesic effect of EM-1 was mediated by central mu-opioid receptor.

      Pubmed     Copy Citation     Plaintext  

      Add institutional full text...

    Notes

     
    Knowledge, pearl, summary or comment to share?
    300 characters remaining
    help        

    hide…

What will the 'Medical Journal of You' look like?

Start your free 21 day trial now.

We guarantee your privacy. Your email address will not be shared.