Angiotensin II type 1 receptor–Dopamine D1 receptor heterodimer (AT1R–D1R)

The Angiotensin II type 1 receptor–Dopamine D1 receptor (AT1R–D1R) heterodimer is a G protein-coupled receptor complex that plays a pivotal role in the regulation of renal sodium handling and blood pressure homeostasis (Zeng et al., 2003, Hypertension). Primarily localized in the renal proximal tubule, this heteromer facilitates direct allosteric cross-talk between the renin-angiotensin system and the dopaminergic system, which typically exert opposing effects on sodium reabsorption (Gildea et al., 2010, Hypertension). Activation of the AT1R component within the complex can lead to the heterologous desensitization of the D1R, thereby inhibiting D1R-mediated natriuresis and contributing to sodium retention (Armando et al., 2015, Free Radical Biology and Medicine). In hypertensive individuals, this balance is often disrupted, making the heteromer a significant focus for cardiovascular research. Pharmacological intervention with AT1R blockers (ARBs) or D1R agonists aims to decouple this inhibitory interaction to restore normal renal function and lower blood pressure (Jose et al., 2018, American Journal of Hypertension). Consequently, the AT1R–D1R heterodimer represents a sophisticated therapeutic target for managing essential hypertension and related renal pathologies.

Other names

AT1R-D1R complexAGTR1-DRD1 heteromerAngiotensin II type 1 receptor-Dopamine receptor D1 complexD1R-AT1R heteromer

Allosteric cross-talk within the heterodimer where AT1R activation antagonizes D1R-mediated signaling and natriuresis; pharmacological blockade of AT1R or activation of D1R modulates the reciprocal inhibitory relationship to regulate renal sodium handling.