Abstract
1. Opioid (μ, δ, κ) and cannabinoid (CB1, CB2) receptors are coupled mainly toGi/Go GTP-binding proteins. The goal of the present study was to determine whether different subtypes of opioid and cannabinoid receptors, when coexpressed in the same cell, share a common reservoir, or utilize different pools, of G proteins.
2. The stimulation of [35S]GTPγS binding by selective opioid and cannabinoid agonists was tested in transiently transfected COS-7 cells, as well as in neuroblastoma cell lines. In COS-7 cells, cotransfection of μ- and δ-opioid receptors led to stimulation of [35S]GTPγS binding by either μ-selective (DAMGO) or δ-selective (DPDPE) agonists. The combined effect of the two agonists was similar to the effect of either DAMGO or DPDPE alone, suggesting the activation of a common G-protein reservoir by the two receptor subtypes.
3. The same phenomenon was observed when COS-7 cells were cotransfected with CB1 cannabinoid receptors and either μ- or δ-opioid receptors.
4. On the other hand, in N18TG2 neuroblastoma cells, which endogenously coexpress CB1 and δ-opioid receptors, as well as in SK-N-SH neuroblastoma cells, which coexpress μ- and δ-opioid receptors, the combined effects of the various agonists (the selective cannabinoid DALN and the selective opioids DPDPE and DAMGO) were additive, implying the activation of different pools of G proteins by each receptorsubtype.
5. These results suggest a fundamental difference between native and artificially transfected cells regarding the compartmentalization of receptors and GTP-binding proteins.
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Shapira, M., Vogel, Z. & Sarne, Y. Opioid and Cannabinoid Receptors Share a Common Pool of GTP-Binding Proteins in Cotransfected Cells, But Not in Cells Which Endogenously Coexpress the Receptors. Cell Mol Neurobiol 20, 291–304 (2000). https://doi.org/10.1023/A:1007058008477
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DOI: https://doi.org/10.1023/A:1007058008477