Nitric Oxide Signaling in Osteoarthritis Pathogenesis
Summary
Osteoarthritis (OA) is a degenerative joint disorder marked by progressive cartilage erosion, subchondral bone remodelling and chronic synovitis. Within this complex milieu, nitric oxide (NO) serves as a critical signalling mediator with both physiological and pathological roles. Synthesised by nitric oxide synthases (NOS) in chondrocytes and synoviocytes in response to mechanical load and pro-inflammatory stimuli, NO regulates vascular tone, bone cell function and immune responses. At low, transient concentrations, NO supports extracellular matrix turnover and maintains chondrocyte viability; however, sustained overproduction leads to formation of reactive nitrogen species such as peroxynitrite, activation of matrix metalloproteinases, inhibition of collagen and proteoglycan synthesis, and induction of chondrocyte apoptosis. Crosstalk between NO and key signalling pathways—including nuclear factor-κB and mitogen-activated protein kinases—drives cartilage degradation and pain sensitisation. Elucidating the balance between homeostatic and deleterious NO signalling is central to developing interventions that recalibrate rather than eliminate NO activity, thereby preserving joint integrity and function.
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Nitric Oxide Signaling in Osteoarthritis Pathogenesis publication trend
The graph below shows the total number of articles in nitric oxide signaling in osteoarthritis pathogenesis across all publications each year (not limited to Nature Index journals).
Technical terms
Nitric Oxide (NO): A small, diffusible gasotransmitter involved in vascular regulation, immune response and cell signalling.
Nitric Oxide Synthase (NOS): A family of enzymes (constitutive and inducible) that convert L-arginine to NO and L-citrulline.
Chondrocyte: The specialised cell in cartilage responsible for producing and maintaining extracellular matrix components.
Peroxynitrite: A potent reactive nitrogen species formed when NO reacts with superoxide, capable of damaging proteins and lipids.
Matrix Metalloproteinase (MMP): Zinc-dependent proteolytic enzymes that degrade extracellular matrix components during tissue remodelling and disease.
References
- Connection between Osteoarthritis and Nitric Oxide: From Pathophysiology to Therapeutic Target. Molecules (2023).
- Nitric oxide in inflammation and pain associated with osteoarthritis. Arthritis Research & Therapy (2008).
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