Regulation of opioid receptors in rat sensory neurons in culture

Joanne J. Chen, Julia Dymshitz, Michael Vasko

Research output: Contribution to journalArticle

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Abstract

To determine whether opioid receptors in sensory neurons are regulated by chronic exposure to opioids, we assessed the binding of various opioid ligands to membranes derived from isolated rat dorsal root ganglia neurons grown in culture. Equilibrium binding of [3H]diprenorphine onto membranes from cells grown for 13-15 days revealed a saturable binding site with a K(d) value of 0.3 ± 0.2 nM and an approximate B(max) value of 1300 ± 200 fmol/mg of protein. [3H]Diprenorphine binding increased 3-fold from 1-15 days in culture. The μ receptors represent ~70 ± 11% of the [3H]diprenorphine binding sites, as indicated by saturation binding of [3H]DAMGO. The κ and δ receptors represent ~10 ± 3% and ~5 ± 2% of the [3H]diprenorphine binding sites, respectively. Preexposure of neurons to 10 μM naloxone for 48 hr up-regulated the receptors by 40%, whereas incubation with 100 nM to 10 μM DAMGO for 48 hr resulted in a significant decrease in the B(max) value of opioid receptors, with a maximum reduction of 70%. The identification of a high level of opioid receptors expressed in isolated sensory neurons and their modulation by opioids demonstrates that cultured sensory neurons are an excellent model with which to study opioid receptor regulation.

Original languageEnglish
Pages (from-to)666-673
Number of pages8
JournalMolecular Pharmacology
Volume51
Issue number4
StatePublished - Apr 1997

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Diprenorphine
Opioid Receptors
Sensory Receptor Cells
Ala(2)-MePhe(4)-Gly(5)-enkephalin
Opioid Analgesics
Binding Sites
Neurons
Spinal Ganglia
Naloxone
Cell Membrane
Ligands
Membranes
Proteins

ASJC Scopus subject areas

  • Pharmacology

Cite this

Regulation of opioid receptors in rat sensory neurons in culture. / Chen, Joanne J.; Dymshitz, Julia; Vasko, Michael.

In: Molecular Pharmacology, Vol. 51, No. 4, 04.1997, p. 666-673.

Research output: Contribution to journalArticle

Chen, Joanne J. ; Dymshitz, Julia ; Vasko, Michael. / Regulation of opioid receptors in rat sensory neurons in culture. In: Molecular Pharmacology. 1997 ; Vol. 51, No. 4. pp. 666-673.
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