title: Tyr-MIF-1 acts as an opiate antagonist in the tail-flick test.
abstract: The naturally occurring brain peptide Tyr-MIF-1 (Tyr-Pro-Leu-Gly-NH2) was tested for its ability to block and reverse the actions of morphine in the tail-flick test. Injected peripherally either 10 minutes before or after morphine, Tyr-MIF-1, like MIF-1, was found to significantly reduce the antinociceptive actions of morphine on thermal pain. The results indicate that Tyr-MIF-1 may act, in part, as an endogenous opiate antagonist.
mesh_terms: D000818:Animals; D006358:Hot Temperature / Q000009:adverse effects; D009075:MSH Release-Inhibiting Hormone / Q000031:analogs & derivatives* / Q000494:pharmacology; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009020:Morphine / Q000037:antagonists & inhibitors; D009270:Naloxone / Q000494:pharmacology; D009292:Narcotic Antagonists; D010146:Pain / Q000188:drug therapy
chemical_list: D009292:Narcotic Antagonists; D009270:Naloxone; D009020:Morphine; C036930:tyrosyl-prolyl-leucyl-glycinamide; D009075:MSH Release-Inhibiting Hormone