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Angiotensin type 1A receptor regulates β-arrestin binding of the β 2 -adrenergic receptor via heterodimerization
Ist Teil von
Molecular and cellular endocrinology, 2017-02, Vol.442, p.113
Ort / Verlag
Ireland
Erscheinungsjahr
2017
Quelle
MEDLINE
Beschreibungen/Notizen
Heterodimerization between angiotensin type 1A receptor (AT
R) and β
-adrenergic receptor (β
AR) has been shown to modulate G protein-mediated effects of these receptors. Activation of G protein-coupled receptors (GPCRs) leads to β-arrestin binding, desensitization, internalization and G protein-independent signaling of GPCRs. Our aim was to study the effect of heterodimerization on β-arrestin coupling. We found that β-arrestin binding of β
AR is affected by activation of AT
Rs. Costimulation with angiotensin II and isoproterenol markedly enhanced the interaction between β
AR and β-arrestins, by prolonging the lifespan of β
AR-induced β-arrestin2 clusters at the plasma membrane. While candesartan, a conventional AT
R antagonist, had no effect on the β-arrestin2 binding to β
AR, TRV120023, a β-arrestin biased agonist, enhanced the interaction. These findings reveal a new crosstalk mechanism between AT
R and β
AR, and suggest that enhanced β-arrestin2 binding to β
AR can contribute to the pharmacological effects of biased AT
R agonists.