Dendroaspis natriuretic peptide binds to the natriuretic peptide clearance receptor

Dendroaspis natriuretic peptide (DNP) is a newly-described natriuretic peptide which lowers blood pressure via vasodilation. The natriuretic peptide clearance receptor (NPR-C) removes natriuretic peptides from the circulation, but whether DNP interacts with human NPR-C directly is unknown. The purpose of this study was to test the hypothesis that DNP binds to NPR-C. ANP, BNP, CNP, and the NPR-C ligands AP-811 and cANP(4-23) displaced [I-125]-ANP from NPR-C with pM-to-nM K-i values. DNP displaced [I-125]-ANP from NPR-C with nM potency, which represents the first direct demonstration of binding of DNP to human NPR-C. DNP showed high pM affinity for the GGA receptor and no affinity for GC-B (K-i > 1000 nM). DNP was nearly 10-fold more potent than ANP at stimulating cGMP production in GGA expressing cells. Blockade of NPR-C might represent a novel therapeutic approach in augmenting the known beneficial actions of DNP in cardiovascular diseases such as hypertension and heart failure. (c) 2007 Elsevier Inc. All rights reserved.