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• W2000304353 abstract "G protein-coupled receptors are cell surface receptors that mediate the effects of extracellular signals in the endocrine/paracrine and sensory systems. Experimental evidence is accumulating, which suggest that these receptors form dimers or higher order oligomers. The functional relevance of G protein-coupled receptor dimerization or oligomerization has been raised in a number of different processes, including ontogeny, internalization, ligand-induced regulation, pharmacological diversity and signal transduction of these receptors. Agonist-independent homo- and hetero-oligomerization of the angiotensin AT1 receptor has been reported, and it has been suggested that hetero-oligomerization with β-adrenergic receptors leads to cross-inhibition of these receptors. Much less is known about the functional interactions between AT1 receptor homo-oligomers. The aim of the present study was to analyze the functional interactions between these homo-oligomers by determining the functions of normal, AT1 receptor blocker (candesartan) resistant (S109Y) and G protein coupling deficient (DRY/AAY) AT1 receptors (co-)expressed in COS-7 cells. Although we have found no evidence that stimulation of a G protein coupling deficient receptor could cross-activate co-expressed normal receptors, candesartan binding to a signaling deficient receptor caused cross-inhibition of co-expressed candesartan resistant AT1 receptors. Since the studied mutations were in the third intracellular helix of the receptor, the observed effects cannot be explained with domain swapping. These data suggest that AT1 receptor blockers cause cross-inhibition of homo-oligomerized AT1 receptors, and support the concept that receptor dimers/oligomers serve as the functional unit of G protein-coupled receptors." @default.
• W2000304353 created "2016-06-24" @default.
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• W2000304353 date "2007-10-01" @default.
• W2000304353 modified "2023-10-17" @default.
• W2000304353 title "Cross-inhibition of angiotensin AT1 receptors supports the concept of receptor oligomerization" @default.
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• W2000304353 doi "https://doi.org/10.1016/j.neuint.2007.05.018" @default.
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