Abstract:
:Several experiments were conducted to examine the effects of intracranial injection of opioid peptides and antagonists on learning and memory in the chick. Pretraining injection of [leu5]enkephalin and the selective delta receptor agonist [D-Pen2,L-Pen5]enkephalin (DPLPE) into the intermediate medial hyperstriatum ventrale (IMHV) produced impairment. ICI 174,864, a delta-selective antagonist, reversed the impairment produced by either [leu5]enkephalin or DPLE, results indicating that delta receptors may play a role in learning in the chick and suggesting that the impairment produced by [leu5]enkephalin is mediated through delta opioid receptors. beta-endorphin produced a naloxone-reversible impairment in performance, which suggests that this impairment is mediated by opioid receptors. Bilateral injection of beta-endorphin into the IMHV produced impairment, as did unilateral injection into the right, but not left, IMHV. Only bilateral injections into IMHV of [leu5]enkephalin were effective. These results suggest that the effects of beta-endorphin are centrally mediated whereas the effects of [leu5]enkephalin may be localized to other brain regions or are peripherally mediated. These initial results suggest that opioids are associated with learning and memory in the chick.
journal_name
Behav Neuroscijournal_title
Behavioral neuroscienceauthors
Patterson TA,Schulteis G,Alvarado MC,Martinez JL Jr,Bennett EL,Rosenzweig MR,Hruby VJdoi
10.1037//0735-7044.103.2.429subject
Has Abstractpub_date
1989-04-01 00:00:00pages
429-37issue
2eissn
0735-7044issn
1939-0084journal_volume
103pub_type
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