Dual agonist occupancy of AT1-R-α2C-AR heterodimers results in atypical Gs-PKA signaling.

Dual agonist occupancy of AT1-R-α2C-AR heterodimers results in atypical Gs-PKA signaling.
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DOI:
10.1038/nchembio.1766
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发表时间:
2015-04
影响因子:
14.8
通讯作者:
Gales, Celine
Gales, Celine
中科院分区:
生物学1区
文献类型:
--
作者:
Bellot, Morgane;Galandrin, Segolene;Boularan, Cedric;Matthies, Heinrich J.;Despas, Fabien;Denis, Colette;Javitch, Jonathan;Mazeres, Serge;Sanni, Samra Joke;Pons, Veronique;Seguelas, Marie-Helene;Hansen, Jakob L.;Pathak, Atul;Galli, Aurelio;Senard, Jean-Michel;Gales, Celine

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Hypersecretion of norepinephrine (NE) and angiotensin II (AngII) is a hallmark of major prevalent cardiovascular diseases that contribute to cardiac pathophysiology and morbidity. Herein, we explore whether heterodimerization of presynaptic AngII AT1 receptor (AT1-R) and NE α2C-adrenergic receptor (α2C-AR) could underlie their functional cross-talk to control NE secretion. Multiple bioluminescence resonance energy transfer and protein complementation assays allowed us to accurately probe the structures and functions of the α2C-AR–AT1-R dimer promoted by ligand binding to individual protomers. We found that dual agonist occupancy resulted in a conformation of the heterodimer different from that induced by active individual protomers and triggered atypical Gs-cAMP–PKA signaling. This specific pharmacological signaling unit was identified in vivo to promote not only NE hypersecretion in sympathetic neurons but also sympathetic hyperactivity in mice. Thus, we uncovered a new process by which GPCR heterodimerization creates an original functional pharmacological entity and that could constitute a promising new target in cardiovascular therapeutics.
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