C-type natriuretic peptide

Also known as: NPPC, P23582

**Mechanism of Action** C-type natriuretic peptide (CNP), encoded by the *NPPC* gene, is a paracrine hormone primarily expressed in the central nervous system, vascular endothelium, and bone. It exerts its effects by binding to natriuretic peptide receptor-B (NPR-B), a guanylyl cyclase-coupled receptor, leading to increased intracellular cyclic guanosine monophosphate (cGMP). In the skeletal system, CNP regulates endochondral ossification by promoting the proliferation and differentiation of chondrocytes in the cartilaginous growth plate, thereby modulating longitudinal bone growth. Unlike atrial and B-type natriuretic peptides, CNP has minimal natriuretic or vasodilatory activity. **Key Research Findings** Approved for clinical use, CNP analogs (e.g., vosoritide) have demonstrated efficacy in increasing growth velocity in children with achondroplasia, the most common form of dwarfism caused by activating mutations in fibroblast growth factor receptor 3 (FGFR3). Preclinical studies show that CNP counteracts FGFR3-mediated inhibition of chondrocyte proliferation via cGMP-dependent pathways. Clinical trials have confirmed sustained improvements in annualized growth rate without significant adverse effects on bone quality or metabolic parameters. Research also indicates CNP’s role in vascular remodeling and reproductive function, though these applications remain investigational. **Clinical Relevance** CNP-based therapies represent the first targeted pharmacological intervention for achondroplasia, addressing the underlying growth plate pathology rather than symptomatic management. Vosoritide, a recombinant CNP analog with extended half-life, is approved for pediatric patients with achondroplasia. Ongoing studies explore its utility in other skeletal dysplasias and conditions involving impaired endochondral ossification. CNP’s limited systemic hemodynamic effects make it a safer alternative to other natriuretic peptides for chronic use. For research purposes only — not medical advice.

Key data

Mechanism of action

Hormone which plays a role in endochondral ossification through regulation of cartilaginous growth plate chondrocytes proliferation and differentiation (By similarity). May also be vasoactive and natriuretic (PubMed:1672777). Acts by specifically binding and stimulating NPR2 to produce cGMP (PubMed:1672777, PubMed:21098034). Binds the clearance receptor NPR3 (PubMed:11533490)

Research & studies

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