Studies in vivo with ICI 174864 and [D-Pen2, D-Pen5]enkephalin

Alan Cowan, Xing Zu Zhu, Frank Porreca

Research output: Contribution to journalArticle

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Abstract

We studied the in vivo pharmacology of a selective agonist (DPDPE) and a selective antagonist (ICI 174864) at delta opioid receptors. ICI 174864 (10 μg icv) caused postural abnormalities, barrel rotation and hypothermia in rats. DPDPE induced behavioural arousal (at 75 μg icv) and barrel rotation (at 125 μg) in rats. ICI 174864 (10 μg icv) attenuated acetic acid induced writhing in mice. This action was antagonized by naloxone (10 but not 2 mg/kg s.c.). A lower, non-agonist dose of ICI 174864 (5 μg) antagonized DPDPE (3 μg icv) in this test without affecting DAGO (0.0006 μg icv), a selective agonist at mu receptors. In the mouse tail flick test, ICI 174864 (10-50 μg icv) did not significantly antagonize the agonist actions of DPDPE (40 μg icv) or DAGO (0.3 μg icv). At 10-50 μg icv, ICI 174864 had no marked effect on gastrointestinal transit in mice. ICI 174864 (25 μg icv or 20 mg/kg s.c.) did not interact with mu opioid receptors in mice rendered physically dependent on morphine.

Original languageEnglish (US)
Pages (from-to)311-314
Number of pages4
JournalNeuropeptides
Volume5
Issue number4-6
DOIs
StatePublished - 1985
Externally publishedYes

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D-Penicillamine (2,5)-Enkephalin
Ala(2)-MePhe(4)-Gly(5)-enkephalin
mu Opioid Receptor
Rats
Hypothermia
Gastrointestinal Transit
delta Opioid Receptor
Naloxone
N,N-diallyl-tyrosyl-alpha-aminoisobutyric acid-phenylalanyl-leucine
Arousal
Acetic Acid
Morphine
Tail
Pharmacology

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Endocrinology, Diabetes and Metabolism
  • Clinical Neurology
  • Neuroscience(all)
  • Cellular and Molecular Neuroscience

Cite this

Studies in vivo with ICI 174864 and [D-Pen2, D-Pen5]enkephalin. / Cowan, Alan; Zhu, Xing Zu; Porreca, Frank.

In: Neuropeptides, Vol. 5, No. 4-6, 1985, p. 311-314.

Research output: Contribution to journalArticle

Cowan, Alan ; Zhu, Xing Zu ; Porreca, Frank. / Studies in vivo with ICI 174864 and [D-Pen2, D-Pen5]enkephalin. In: Neuropeptides. 1985 ; Vol. 5, No. 4-6. pp. 311-314.
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