Document Detail

Probing the opioid receptor complex with (+)-trans-superfit. I. Evidence that [D-Pen2,D-Pen5]enkephalin interacts with high affinity at the delta cx binding site.
MedLine Citation:
PMID:  1648715     Owner:  NLM     Status:  MEDLINE    
A variety of data support the existence of an opioid receptor complex composed of distinct but interacting mu cx and delta cx binding sites, where "cx" indicates "in the complex." The ability of subantinociceptive doses of [Leu5]enkephalin and [Met5]enkephalin to potentiate and attenuate morphine-induced antinociception, respectively, is thought to be mediated via their binding to the delta cx binding site. [D-Pen2,D-Pen5]Enkephalin also modulates morphine-induced antinociception, but has very low affinity for the delta cx binding site in vitro. In the present study, membranes were depleted of their delta ncx binding sites by pretreatment with the site-directed acylating agent, (3S,4S)-(+)-trans-N-[1-[2-(4-isothiocyanato)phenyl)-ethyl]-3-methy l-4- piperidyl]-N-phenylpropaneamide hydrochloride, which permits selective labeling of the delta cx binding site with [3H][D-Ala2,D-Leu5]enkephalin. The major findings of this study are that with this preparation of rat brain membranes: a) there are striking differences between the delta cx and mu binding sites; and b) both [D-Pen2,D-Pen5]enkephalin and [D-Pen2,L-Pen5]enkephalin exhibit high affinity for the delta cx binding site.
R B Rothman; A Mahboubi; V Bykov; C H Kim; A E Jacobson; K C Rice
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  Peptides     Volume:  12     ISSN:  0196-9781     ISO Abbreviation:  Peptides     Publication Date:    1991 Mar-Apr
Date Detail:
Created Date:  1991-08-14     Completed Date:  1991-08-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008690     Medline TA:  Peptides     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  359-64     Citation Subset:  IM    
Unit on Receptor Studies, NIDDK, NIH, Bethesda, MD 20892.
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MeSH Terms
Binding Sites
Brain / metabolism
Enkephalin, D-Penicillamine (2,5)-
Enkephalin, Leucine-2-Alanine / metabolism
Enkephalins / metabolism*
Fentanyl / analogs & derivatives,  pharmacology
Receptors, Opioid / drug effects,  metabolism*
Receptors, Opioid, delta
Receptors, Opioid, mu
Reg. No./Substance:
0/Enkephalins; 0/Receptors, Opioid; 0/Receptors, Opioid, delta; 0/Receptors, Opioid, mu; 101472-20-2/3-methylfentanyl isothiocyanate; 437-38-7/Fentanyl; 63631-40-3/Enkephalin, Leucine-2-Alanine; 88373-73-3/Enkephalin, D-Penicillamine (2,5)-

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