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  • Title: Tyr-MIF-1 attenuates antinociceptive responses induced by three models of stress-analgesia.
    Author: Galina ZH, Kastin AJ.
    Journal: Br J Pharmacol; 1987 Apr; 90(4):669-74. PubMed ID: 2884005.
    Abstract:
    Tyr-MIF-1 (Tyr-Pro-Leu-Gly-NH2), a biologically active brain peptide, has previously been shown to antagonize the analgesia induced by morphine. In this report experiments are described in which mice were tested on the hot-plate in three models of antinociception - shock, novel environment, and warm-water swim - after the administration of various doses of Tyr-MIF-1 without any exogenous opiates. The peptide reduced the antinociception produced by all three methods of inducing endogenous antinociception. These results add further support for the existence of peptides like Tyr-MIF-1 that act as opiate antagonists.
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