Dynorphin A(1-13) preferentially inhibits behaviors induced by the D2 dopamine agonist RU 24213 but not by the D1 dopamine agonist SK&F 38393.
The effects of dynorphin A(1-13) on the D1 dopamine agonist SK&F 38393- and the D2 dopamine agonist RU 24213-induced behavioral alterations in the mouse were determined by using multidimensional behavioral analyses based upon a capacitance system. Although dynorphin A(1-13) (3.0 or 12.5 micrograms) alone did not produce any significant effects on behaviors, the peptide (12.5 micrograms) caused an inhibitory effect on the RU 24213 (3.0 mg/kg)-induced increase in behavioral patterns such as linear locomotion and circling except rearing and grooming behaviors. The antagonistic effects of dynorphin A(1-313) (12.5 micrograms) were fully reversed by the opioid antagonist M(r) 2266 (10.0 mg/kg). However, dynorphin A(1-13) (3.0 or 12.5 micrograms) failed to affect behaviors elicited by SK&F 38393 (10.0 mg/kg). These results suggest that dynorphin A(1-13) plays an inhibitory role in behaviors induced by the D2 dopamine agonist but not by the D1 dopamine agonist, possibly through the mediation of kappa-opioid receptors.
Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Meijo University, Nagoya, Japan.
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Ukai
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Toyoshi
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Kameyama
D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / Q000494:pharmacology*; D000700:Analgesics / Q000494:pharmacology*; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D001575:Benzomorphans / Q000494:pharmacology; D015259:Dopamine Agents / Q000494:pharmacology*; D004399:Dynorphins / Q000494:pharmacology*; D006120:Grooming / Q000187:drug effects; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009043:Motor Activity / Q000187:drug effects; D009292:Narcotic Antagonists / Q000494:pharmacology; D010446:Peptide Fragments / Q000494:pharmacology*; D010627:Phenethylamines / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D011954:Receptors, Dopamine / Q000187:drug effects / Q000502:physiology*; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D011957:Receptors, Opioid / Q000187:drug effects; D017473:Receptors, Opioid, kappa
D000700:Analgesics; D001575:Benzomorphans; D015259:Dopamine Agents; D009292:Narcotic Antagonists; D010446:Peptide Fragments; D010627:Phenethylamines; D011954:Receptors, Dopamine; D017447:Receptors, Dopamine D1; D017448:Receptors, Dopamine D2; D011957:Receptors, Opioid; D017473:Receptors, Opioid, kappa; C027247:MR 2266; D015647:2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine; C016868:N-n-propyl-N-phenylethyl-4(3-hydroxyphenyl)ethylamine hydrochloride; C026843:dynorphin (1-13); D004399:Dynorphins