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  • Title: Prolyl-leucyl-glycinamide reduces aggression and blocks defeat-induced opioid analgesia in mice.
    Author: Teskey GC, Kavaliers M.
    Journal: Peptides; 1985; 6(2):165-7. PubMed ID: 2863808.
    Abstract:
    The effects of Prolyl-leucyl-glycinamide (PLG, MIF-1) and the exogenous opiate antagonist naloxone, on aggressive interactions and defeat-induced analgesia were examined in male mice. Both substances reduced the number of bites required to obtain defeat in subordinate mice during aggressive encounters as well as blocking the subsequent defeat-induced analgesia. These results suggest that MIF-1 may function as an endogenous opioid antagonist and have an inhibitory influence on aggression.
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