Molecular determinants of angiotensin II type 1 receptor functional selectivity

Mark Aplin; Marie Mi Bonde; Jakob Lerche Hansen

doi:10.1016/j.yjmcc.2008.09.123

Molecular determinants of angiotensin II type 1 receptor functional selectivity

Mark Aplin, Marie Mi Bonde, Jakob Lerche Hansen

Department of Neuroscience

42 Citations (Scopus)

Abstract

The angiotensin AT(1) receptor is an important pharmacological target in the treatment of cardiovascular disorders, such as hypertension, diabetic nephropathy, cardiac hypertrophy, arrhythmia and failure. Simultaneously, the AT(1) receptor has emerged to be a prominent model for the emerging concept that receptors may attain multiple active states with differentiated functional outcomes. Two major signalling pathways are employed by the AT(1) receptor, namely 1) the canonical G(q) protein-dependent activation of inositol phosphate turnover and intracellular calcium release, and 2) G protein-independent recruitment of beta-arrestin-scaffolded signalling complexes that activate protein kinase pathways. Different states of receptor activation with preference for individual downstream pathways (functional selectivity) have been demonstrated in mutational studies of the AT(1) receptor and by pharmacological probing with analogues of angiotensin II. These studies also provide clues about the conformational changes that underlie different functional outcomes. In this review, we evaluate current knowledge of the molecular determinants of AT(1) receptor activation, which may distinguish G protein-dependent and -independent behaviour. While G protein activation is known to be detrimental, G protein-independent signalling by the AT(1) receptor has been associated with phenotypes such as cell survival and renewal, regulation of cardiac contraction and cell migration. It is therefore currently hypothesized that selective blockade of G protein actions and simultaneous activation of G protein-independent signalling will prove to be a feasible strategy for improved cardiovascular therapy. The pharmacological perspectives of functional selectivity by receptors, such as the AT(1) receptor, urge the elucidation of molecular mechanisms that govern disparate signalling events.

Original language	English
Journal	Journal of Molecular and Cellular Cardiology
Volume	46
Issue number	1
Pages (from-to)	15-24
Number of pages	9
ISSN	0022-2828
DOIs	https://doi.org/10.1016/j.yjmcc.2008.09.123
Publication status	Published - 2008

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title = "Molecular determinants of angiotensin II type 1 receptor functional selectivity",

abstract = "The angiotensin AT(1) receptor is an important pharmacological target in the treatment of cardiovascular disorders, such as hypertension, diabetic nephropathy, cardiac hypertrophy, arrhythmia and failure. Simultaneously, the AT(1) receptor has emerged to be a prominent model for the emerging concept that receptors may attain multiple active states with differentiated functional outcomes. Two major signalling pathways are employed by the AT(1) receptor, namely 1) the canonical G(q) protein-dependent activation of inositol phosphate turnover and intracellular calcium release, and 2) G protein-independent recruitment of beta-arrestin-scaffolded signalling complexes that activate protein kinase pathways. Different states of receptor activation with preference for individual downstream pathways (functional selectivity) have been demonstrated in mutational studies of the AT(1) receptor and by pharmacological probing with analogues of angiotensin II. These studies also provide clues about the conformational changes that underlie different functional outcomes. In this review, we evaluate current knowledge of the molecular determinants of AT(1) receptor activation, which may distinguish G protein-dependent and -independent behaviour. While G protein activation is known to be detrimental, G protein-independent signalling by the AT(1) receptor has been associated with phenotypes such as cell survival and renewal, regulation of cardiac contraction and cell migration. It is therefore currently hypothesized that selective blockade of G protein actions and simultaneous activation of G protein-independent signalling will prove to be a feasible strategy for improved cardiovascular therapy. The pharmacological perspectives of functional selectivity by receptors, such as the AT(1) receptor, urge the elucidation of molecular mechanisms that govern disparate signalling events.",

author = "Mark Aplin and Bonde, {Marie Mi} and Hansen, {Jakob Lerche}",

note = "Keywords: Amino Acid Sequence; Angiotensin II; Animals; Arrestins; Calcium; Cytoplasm; Epitopes; Humans; Ligands; Models, Biological; Molecular Sequence Data; Protein Structure, Tertiary; Receptor, Angiotensin, Type 1; Receptors, G-Protein-Coupled; Signal Transduction",

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AU - Aplin, Mark

AU - Bonde, Marie Mi

AU - Hansen, Jakob Lerche

N1 - Keywords: Amino Acid Sequence; Angiotensin II; Animals; Arrestins; Calcium; Cytoplasm; Epitopes; Humans; Ligands; Models, Biological; Molecular Sequence Data; Protein Structure, Tertiary; Receptor, Angiotensin, Type 1; Receptors, G-Protein-Coupled; Signal Transduction

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N2 - The angiotensin AT(1) receptor is an important pharmacological target in the treatment of cardiovascular disorders, such as hypertension, diabetic nephropathy, cardiac hypertrophy, arrhythmia and failure. Simultaneously, the AT(1) receptor has emerged to be a prominent model for the emerging concept that receptors may attain multiple active states with differentiated functional outcomes. Two major signalling pathways are employed by the AT(1) receptor, namely 1) the canonical G(q) protein-dependent activation of inositol phosphate turnover and intracellular calcium release, and 2) G protein-independent recruitment of beta-arrestin-scaffolded signalling complexes that activate protein kinase pathways. Different states of receptor activation with preference for individual downstream pathways (functional selectivity) have been demonstrated in mutational studies of the AT(1) receptor and by pharmacological probing with analogues of angiotensin II. These studies also provide clues about the conformational changes that underlie different functional outcomes. In this review, we evaluate current knowledge of the molecular determinants of AT(1) receptor activation, which may distinguish G protein-dependent and -independent behaviour. While G protein activation is known to be detrimental, G protein-independent signalling by the AT(1) receptor has been associated with phenotypes such as cell survival and renewal, regulation of cardiac contraction and cell migration. It is therefore currently hypothesized that selective blockade of G protein actions and simultaneous activation of G protein-independent signalling will prove to be a feasible strategy for improved cardiovascular therapy. The pharmacological perspectives of functional selectivity by receptors, such as the AT(1) receptor, urge the elucidation of molecular mechanisms that govern disparate signalling events.

AB - The angiotensin AT(1) receptor is an important pharmacological target in the treatment of cardiovascular disorders, such as hypertension, diabetic nephropathy, cardiac hypertrophy, arrhythmia and failure. Simultaneously, the AT(1) receptor has emerged to be a prominent model for the emerging concept that receptors may attain multiple active states with differentiated functional outcomes. Two major signalling pathways are employed by the AT(1) receptor, namely 1) the canonical G(q) protein-dependent activation of inositol phosphate turnover and intracellular calcium release, and 2) G protein-independent recruitment of beta-arrestin-scaffolded signalling complexes that activate protein kinase pathways. Different states of receptor activation with preference for individual downstream pathways (functional selectivity) have been demonstrated in mutational studies of the AT(1) receptor and by pharmacological probing with analogues of angiotensin II. These studies also provide clues about the conformational changes that underlie different functional outcomes. In this review, we evaluate current knowledge of the molecular determinants of AT(1) receptor activation, which may distinguish G protein-dependent and -independent behaviour. While G protein activation is known to be detrimental, G protein-independent signalling by the AT(1) receptor has been associated with phenotypes such as cell survival and renewal, regulation of cardiac contraction and cell migration. It is therefore currently hypothesized that selective blockade of G protein actions and simultaneous activation of G protein-independent signalling will prove to be a feasible strategy for improved cardiovascular therapy. The pharmacological perspectives of functional selectivity by receptors, such as the AT(1) receptor, urge the elucidation of molecular mechanisms that govern disparate signalling events.

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DO - 10.1016/j.yjmcc.2008.09.123

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Molecular determinants of angiotensin II type 1 receptor functional selectivity

Abstract

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