Natriuretic peptides B

Also known as: Brain natriuretic factor prohormone, Gamma-brain natriuretic peptide, Iso-ANP, NPPB, P16860

**Mechanism of Action** Natriuretic peptide B (BNP), encoded by the *NPPB* gene, is a cardiac hormone primarily secreted by ventricular myocytes in response to wall stretch and volume overload. It binds to natriuretic peptide receptor A (NPR-A), activating guanylyl cyclase to increase intracellular cGMP. This signaling cascade promotes natriuresis, vasodilation, and inhibition of the renin-angiotensin-aldosterone system (RAAS), thereby reducing blood pressure and cardiac preload. The prohormone (proBNP) is cleaved into the biologically active BNP and the inactive N-terminal fragment (NT-proBNP), both of which are clinically measured. **Key Research Findings** Elevated BNP and NT-proBNP levels are established biomarkers for heart failure (HF) diagnosis, severity stratification, and prognosis. Studies demonstrate that BNP-guided therapy improves outcomes in chronic HF by optimizing diuretic and vasodilator dosing. Synthetic BNP (nesiritide) was approved for acute decompensated HF, though meta-analyses show modest benefits in symptom relief without significant mortality reduction. Research also links BNP to renal function modulation, with higher levels correlating with glomerular filtration rate decline in cardiorenal syndrome. **Clinical Relevance** BNP testing is standard in emergency and outpatient settings to differentiate dyspnea of cardiac vs. pulmonary origin. NT-proBNP is preferred for long-term monitoring due to its longer half-life. Despite approval, synthetic BNP use has declined due to hypotension risks and lack of survival benefit. Ongoing studies explore BNP analogs with improved pharmacokinetics and tissue selectivity. For research purposes only — not medical advice.

Key data

Mechanism of action

Cardiac hormone that plays a key role in mediating cardio-renal homeostasis (PubMed:1672777, PubMed:17372040, PubMed:1914098, PubMed:9458824). May also function as a paracrine antifibrotic factor in the heart (By similarity). Acts by specifically binding and stimulating NPR1 to produce cGMP, which in turn activates effector proteins that drive various biological responses (PubMed:1672777, PubMed:17349887, PubMed:17372040, PubMed:21098034, PubMed:25339504, PubMed:9458824). Involved in regulating the extracellular fluid volume and maintaining the fluid-electrolyte balance through natriuresis, diuresis, vasorelaxation, and inhibition of renin and aldosterone secretion (PubMed:1914098, PubMed:9458824). Binds the clearance receptor NPR3 (PubMed:16870210)

Research & studies

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