Influence of opioid peptides on learning and memory processes in the chick.


: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.


Behav Neurosci


Behavioral neuroscience


Patterson TA,Schulteis G,Alvarado MC,Martinez JL Jr,Bennett EL,Rosenzweig MR,Hruby VJ




Has Abstract


1989-04-01 00:00:00












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    journal_title:Behavioral neuroscience

    pub_type: 杂志文章


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    authors: Borszcz GS

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