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. 1999 Aug 15;342(Pt 1):71–78.

Differential G-protein activation by alkaloid and peptide opioid agonists in the human neuroblastoma cell line SK-N-BE.

S Allouche 1, J Polastron 1, A Hasbi 1, V Homburger 1, P Jauzac 1
PMCID: PMC1220438  PMID: 10432302

Abstract

Differences in the specificity of coupling of delta-opioid receptor with G-protein have been reported in the literature. We have observed a differential desensitization of delta-opioid receptors, endogenously expressed in the neuroblastoma cell line SK-N-BE, induced by peptide and alkaloid agonists. By combining photoaffinity labelling of receptor-activated G-proteins with [alpha-(32)P]azidoanilide-GTP and an anti-sense oligodeoxynucleotide strategy, we examined whether the chemical nature of opioid agonists, alkaloid or peptide, has a critical role in determining a G(i)alpha/G(o)alpha-protein-selective activation by the human delta-opioid receptors. Etorphine, a non-selective alkaloid agonist, was shown to stimulate the incorporation of [alpha-(32)P]azidoanilide-GTP into G(i)alpha1, G(i)alpha2, G(i)alpha3 and pertussis-toxin-insensitive Galpha subunits. In contrast, [d-Pen(2),d-Pen(5)]enkephalin (DPDPE; Pen is penicillamine) and Tyr-d-Ala-Phe-Asp-Val-Val-Gly-NH(2) (deltorphin I), selective peptide agonists, mainly activated G(i)alpha2 and G(o)alpha2 subunits. The 'knock-down' of G(o)alpha2 subunits by anti-sense oligodeoxynucleotides selectively decreased the inhibition of adenylate cyclase induced by DPDPE and deltorphin I, whereas anti-sense oligodeoxynucleotides directed against G(i)alpha2 subunits only decreased the potency of etorphine in inhibiting cAMP accumulation. These results suggest that the nature of the agonist, peptide or alkaloid is critical in determining the interaction between human delta-opioid receptors and Galpha subunits.

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Selected References

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