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

The Dopamine D1 receptor–Angiotensin II type 1 receptor (D1R–AT1R) heterodimer is a functional protein complex primarily located in the renal proximal tubule cells, where it plays a critical role in regulating blood pressure and sodium balance (PubMed: 24631556). Under physiological conditions, the D1R and AT1R exhibit an antagonistic relationship; activation of D1R promotes sodium excretion (natriuresis) by inhibiting AT1R-mediated sodium reabsorption (PubMed: 21930957). In pathological states such as hypertension, this reciprocal regulation is often impaired, leading to sodium retention and elevated blood pressure (PubMed: 18434544). Targeting the interface of this heterodimer offers a novel therapeutic strategy to restore the inhibitory effect of D1R on AT1R or to disrupt maladaptive signaling pathways. Research suggests that small molecules or interfering peptides designed to modulate the D1R–AT1R interface could provide more precise control over renal hemodynamics compared to traditional monotherapies (PubMed: 25611328). Understanding the structural basis of this interaction is essential for developing next-generation antihypertensive agents that leverage GPCR heteromerization.

Other names

D1R-AT1R complexAT1R-D1R heteromerAngiotensin II type 1 receptor-Dopamine D1 receptor complexD1-AT1 receptor heteromer

Allosteric modulation of AT1R signaling through D1R activation within the heterodimer, leading to AT1R desensitization and increased natriuresis (PubMed: 24631556).