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

The Dopamine D1 receptor (D1R) in the Angiotensin II type 1 receptor (AT1R)–D1R heterodimer is a functional complex primarily located in the renal proximal tubule (Zeng et al., 2003, Hypertension). This heterodimer mediates the counter-regulatory relationship between the pro-natriuretic dopaminergic system and the anti-natriuretic renin-angiotensin system (Jose et al., 2008, J Am Soc Nephrol). Within the complex, the receptors exhibit reciprocal allosteric inhibition; for example, AT1R activation can uncouple D1R from its G-protein, thereby reducing sodium excretion (Armando et al., 2015, Curr Opin Nephrol Hypertens). Conversely, D1R activation can inhibit AT1R-mediated phospholipase C activity and calcium mobilization. This interaction is crucial for maintaining blood pressure, and its disruption is linked to the development of essential hypertension (Zeng et al., 2003). Pharmacological intervention often targets this complex using AT1R antagonists or D1R agonists to restore sodium balance and lower blood pressure.

Other names

AT1R-D1R complexAngiotensin II type 1 receptor-Dopamine D1 receptor heteromerD1R-AT1R heterodimerDopamine D1 receptor-Angiotensin II type 1 receptor complex

Reciprocal allosteric modulation where activation of one receptor within the heterodimer inhibits the signaling and function of the partner receptor to regulate sodium transport.