Key result
Chondrocyte CNP overexpression prevents growth delay and cartilage damage in an inflammatory arthritis mouse model.
Why the study?
The role of C-type natriuretic peptide signaling in preventing growth delay and cartilage damage in inflammatory arthritis was investigated.
Does CNP overexpression prevent growth delay and cartilage damage in a mouse model of inflammatory arthritis?
Does CNP overexpression prevent growth delay and cartilage damage in a mouse model of inflammatory arthritis?
CNP overexpression protects against cartilage damage and prevents endochondral growth delay in a mouse model of inflammatory arthritis, suggesting a potential therapeutic target for juvenile idiopathic arthritis.
CNP overexpression merits further preclinical study in inflammatory arthritis; leaves open translation to children with juvenile idiopathic arthritis.
OBJECTIVE: The C-type natriuretic peptide (CNP) signaling pathway is a major contributor to postnatal skeletal growth in humans. This study was undertaken to investigate whether CNP signaling could prevent growth delay and cartilage damage in an animal model of inflammatory arthritis. METHODS: We generated transgenic mice that overexpress CNP (B6.SJL-Col2a1-NPPC) in chondrocytes. We introduced the CNP transgene into mice with experimental systemic inflammatory arthritis (K/BxN T cell receptor [TCR]) and determined the effect of CNP overexpression in chondrocytes on the severity of arthritis, cartilage damage, and linear growth. We also examined primary chondrocyte cultures for changes in gene and protein expression resulting from CNP overexpression. RESULTS: K/BxN TCR mice exhibited linear growth delay (P < 0.01) compared to controls, and this growth delay was correlated with the severity of arthritis. Diminished chondrocyte proliferation and matrix production was also seen in K/BxN TCR mice. Compared to non-CNP-transgenic mice, K/BxN TCR mice with overexpressed CNP had milder arthritis, no growth delay, and less cartilage damage. Primary chondrocytes from mice overexpressing CNP were less sensitive to inflammatory cytokines than wild-type mouse chondrocytes. CONCLUSION: CNP overexpression in chondrocytes can prevent endochondral growth delay and protect against cartilage damage in a mouse model of inflammatory arthritis. Pharmacologic or biologic modulation of the CNP signaling pathway may prevent growth retardation and protect cartilage in patients with inflammatory joint diseases, such as juvenile idiopathic arthritis.
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Bükülmez et al. (2013) studied Inflammatory arthritis. CNP overexpression in chondrocytes vs. Non-CNP-transgenic mice was evaluated on Severity of arthritis, cartilage damage, and linear growth. CNP overexpression in chondrocytes prevented endochondral growth delay and protected against cartilage damage in a mouse model of inflammatory arthritis.
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