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Structural and functional interactions between six-transmembrane ?-opioid receptors and ?2-adrenoreceptors modulate opioid signaling.


ABSTRACT: The primary molecular target for clinically used opioids is the ?-opioid receptor (MOR). Besides the major seven-transmembrane (7TM) receptors, the MOR gene codes for alternatively spliced six-transmembrane (6TM) isoforms, the biological and clinical significance of which remains unclear. Here, we show that the otherwise exclusively intracellular localized 6TM-MOR translocates to the plasma membrane upon coexpression with ?2-adrenergic receptors (?2-ARs) through an interaction with the fifth and sixth helices of ?2-AR. Coexpression of the two receptors in BE(2)-C neuroblastoma cells potentiates calcium responses to a 6TM-MOR ligand, and this calcium response is completely blocked by a selective ?2-antagonist in BE(2)-C cells, and in trigeminal and dorsal root ganglia. Co-administration of 6TM-MOR and ?2-AR ligands leads to substantial analgesic synergy and completely reverses opioid-induced hyperalgesia in rodent behavioral models. Together, our results provide evidence that the heterodimerization of 6TM-MOR with ?2-AR underlies a molecular mechanism for 6TM cellular signaling, presenting a unique functional responses to opioids. This signaling pathway may contribute to the hyperalgesic effects of opioids that can be efficiently blocked by ?2-AR antagonists, providing a new avenue for opioid therapy.

SUBMITTER: Samoshkin A 

PROVIDER: S-EPMC4676002 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature

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Structural and functional interactions between six-transmembrane μ-opioid receptors and β2-adrenoreceptors modulate opioid signaling.

Samoshkin Alexander A   Convertino Marino M   Viet Chi T CT   Wieskopf Jeffrey S JS   Kambur Oleg O   Marcovitz Jaclyn J   Patel Pinkal P   Stone Laura S LS   Kalso Eija E   Mogil Jeffrey S JS   Schmidt Brian L BL   Maixner William W   Dokholyan Nikolay V NV   Diatchenko Luda L  

Scientific reports 20151211


The primary molecular target for clinically used opioids is the μ-opioid receptor (MOR). Besides the major seven-transmembrane (7TM) receptors, the MOR gene codes for alternatively spliced six-transmembrane (6TM) isoforms, the biological and clinical significance of which remains unclear. Here, we show that the otherwise exclusively intracellular localized 6TM-MOR translocates to the plasma membrane upon coexpression with β2-adrenergic receptors (β2-ARs) through an interaction with the fifth and  ...[more]

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