the antagonistic effects of beta-endorphin- ( 1-27 ) on the analgesia induced by beta-endorphin ( epsilon-opioid receptor agonist ) , d-ala2-nmephe4-gly-ol-enkephalin ( dago ) and morphine , ( mu-opioid receptor agonists ) , d-pen2-d-pen5-enkephalin ( dpdpe ) and d-ala2-d-leu5-enkephalin ( dadle ) ( delta-opioid receptor agonists ) and u-50 , 488h ( kappa-opioid receptor agonist ) were studied . beta-endorphin- ( 1-27 ) injected intraventricularly , at doses which , when injected alone did not produce analgesia , antagonized the analgesia induced by beta-endorphin given intraventricularly .
C0525856
dpdpe
C0014298
enkephalin