Key Points
- To elucidate the ligand-receptor relationships and binding selectivity of atrial, brain, and C-type natriuretic peptides across distinct natriuretic peptide receptors in human, bovine, and rat models.
- Characterized receptor preparations from human, bovine, and rat tissues and cultured cells using receptor binding assays, Northern blot analysis, and cGMP production measurements.
- Evaluated binding affinities for the clearance receptor (C-receptor) and potencies for cGMP synthesis mediated by guanylate cyclase-A (GC-A) and guanylate cyclase-B (GC-B) in homologous assay systems.
- Substantial species differences were observed in receptor selectivity, particularly involving brain natriuretic peptide (BNP).
- In both humans and rats, the rank order of binding affinity for the C-receptor was ANP > CNP > BNP.
- cGMP production potency mediated by the ANP-A receptor (GC-A) followed the rank order ANP ≥ BNP >> CNP, whereas activation via the ANP-B receptor (GC-B) followed CNP > ANP ≥ BNP.
Structured PICO
PPopulationReceptor preparations from human, bovine, and rat tissues and cultured cells
IInterventionAtrial natriuretic peptide (ANP), brain natriuretic peptide (BNP), and C-type natriuretic peptide (CNP)
OOutcomeBinding affinities for the C-receptor and potencies for cGMP production via the ANP-A receptor (GC-A) and the ANP-B receptor (GC-B)surrogate
This study demonstrates distinct receptor selectivities and species differences among natriuretic peptides (ANP, BNP, CNP) for their respective receptors, providing foundational insights into their physiological roles.