Alterations of synaptic high and low affinity opiate binding sites after acute and chronic morphine administration in mice

Subbiah Sivam, Toshitaka Nabeshima, Ing K. Ho

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Abstract1.The opiate receptor binding to whole brain synaptic membranes obtained from mice subjected to acute and chronic morphine administration and precipitated withdrawal was investigated.2.The number of high and low affinity binding sites was significantly higher in morphine tolerant group than in control; acute administration of morphine also induced an increase in the number of binding sites, though this increase was significantly lower as compared to tolerant group.3.The affinity of both high and low affinity sites, however remained unchanged after acute or chronic treatment. In contrast, both the affinity and the number of binding sites were significantly reduced after precipitated withdrawal, compared to the tolerant group.4.Sodium chloride enhanced the antagonist binding and inhibited the agonist binding in both tolerant and non-tolerant groups.5.It is concluded that (a) the increase in the number of receptors during tolerance development is an extension of the acute effect of morphine, (b) the character of tolerant membrane is qualitatively same as that of non-tolerant membrane, (c) upon withdrawal, the receptor population is brought back to normal; the altered higher, affinity after withdrawal may be a compensatory effect as a corollary to the withdrawal-induced decrease in receptor population.

Original languageEnglish (US)
Pages (from-to)119-127
Number of pages9
JournalProgress in Neuro-Psychopharmacology and Biological Psychiatry
Volume6
Issue number2
DOIs
StatePublished - 1982
Externally publishedYes

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Opiate Alkaloids
Morphine
Binding Sites
Synaptic Membranes
Membranes
Opioid Receptors
Sodium Chloride
Population
Control Groups
Brain

Keywords

  • morphine tolerance
  • opiate receptor
  • precipitated withdrawal
  • synaptic membrane

ASJC Scopus subject areas

  • Biological Psychiatry
  • Pharmacology

Cite this

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abstract = "Abstract1.The opiate receptor binding to whole brain synaptic membranes obtained from mice subjected to acute and chronic morphine administration and precipitated withdrawal was investigated.2.The number of high and low affinity binding sites was significantly higher in morphine tolerant group than in control; acute administration of morphine also induced an increase in the number of binding sites, though this increase was significantly lower as compared to tolerant group.3.The affinity of both high and low affinity sites, however remained unchanged after acute or chronic treatment. In contrast, both the affinity and the number of binding sites were significantly reduced after precipitated withdrawal, compared to the tolerant group.4.Sodium chloride enhanced the antagonist binding and inhibited the agonist binding in both tolerant and non-tolerant groups.5.It is concluded that (a) the increase in the number of receptors during tolerance development is an extension of the acute effect of morphine, (b) the character of tolerant membrane is qualitatively same as that of non-tolerant membrane, (c) upon withdrawal, the receptor population is brought back to normal; the altered higher, affinity after withdrawal may be a compensatory effect as a corollary to the withdrawal-induced decrease in receptor population.",
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T1 - Alterations of synaptic high and low affinity opiate binding sites after acute and chronic morphine administration in mice

AU - Sivam, Subbiah

AU - Nabeshima, Toshitaka

AU - Ho, Ing K.

PY - 1982

Y1 - 1982

N2 - Abstract1.The opiate receptor binding to whole brain synaptic membranes obtained from mice subjected to acute and chronic morphine administration and precipitated withdrawal was investigated.2.The number of high and low affinity binding sites was significantly higher in morphine tolerant group than in control; acute administration of morphine also induced an increase in the number of binding sites, though this increase was significantly lower as compared to tolerant group.3.The affinity of both high and low affinity sites, however remained unchanged after acute or chronic treatment. In contrast, both the affinity and the number of binding sites were significantly reduced after precipitated withdrawal, compared to the tolerant group.4.Sodium chloride enhanced the antagonist binding and inhibited the agonist binding in both tolerant and non-tolerant groups.5.It is concluded that (a) the increase in the number of receptors during tolerance development is an extension of the acute effect of morphine, (b) the character of tolerant membrane is qualitatively same as that of non-tolerant membrane, (c) upon withdrawal, the receptor population is brought back to normal; the altered higher, affinity after withdrawal may be a compensatory effect as a corollary to the withdrawal-induced decrease in receptor population.

AB - Abstract1.The opiate receptor binding to whole brain synaptic membranes obtained from mice subjected to acute and chronic morphine administration and precipitated withdrawal was investigated.2.The number of high and low affinity binding sites was significantly higher in morphine tolerant group than in control; acute administration of morphine also induced an increase in the number of binding sites, though this increase was significantly lower as compared to tolerant group.3.The affinity of both high and low affinity sites, however remained unchanged after acute or chronic treatment. In contrast, both the affinity and the number of binding sites were significantly reduced after precipitated withdrawal, compared to the tolerant group.4.Sodium chloride enhanced the antagonist binding and inhibited the agonist binding in both tolerant and non-tolerant groups.5.It is concluded that (a) the increase in the number of receptors during tolerance development is an extension of the acute effect of morphine, (b) the character of tolerant membrane is qualitatively same as that of non-tolerant membrane, (c) upon withdrawal, the receptor population is brought back to normal; the altered higher, affinity after withdrawal may be a compensatory effect as a corollary to the withdrawal-induced decrease in receptor population.

KW - morphine tolerance

KW - opiate receptor

KW - precipitated withdrawal

KW - synaptic membrane

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