Cartilage extracellular matrix components (Cartilage ECM) (Cartilage ECM)

Cartilage extracellular matrix (ECM) components represent the complex network of proteins and carbohydrates that provide structural integrity and mechanical functionality to articular cartilage. The primary constituents include type II collagen, which provides tensile strength, and aggrecan, a large proteoglycan that enables the tissue to resist compressive forces through its high osmotic pressure (Sophiafox et al., 2009). Other critical elements include hyaluronic acid, link protein, and various small leucine-rich proteoglycans (SLRPs) that regulate matrix assembly and cell-matrix interactions. In pathological conditions such as osteoarthritis, the homeostatic balance is shifted toward catabolism, where enzymes like matrix metalloproteinases (MMPs) and ADAMTS-4/5 degrade these components, leading to joint degradation (Nagase & Kashiwagi, 2003). Therapeutic interventions often target these components by either supplementing lost matrix (e.g., hyaluronic acid viscosupplementation) or stimulating chondrocytes to synthesize new ECM using growth factors like Sprifermin (Lohmander et al., 2014). Additionally, inhibiting the degradative enzymes that break down the ECM remains a major focus for developing disease-modifying osteoarthritis drugs (DMOADs). The avascular nature of cartilage presents a significant challenge for drug delivery, often requiring intra-articular administration to reach these targets effectively (Kraus et al., 2011).

Other names

Articular cartilage matrixChondrocyte extracellular matrixCartilage matrix

Stimulation of extracellular matrix synthesis, inhibition of matrix-degrading enzymes (MMPs and ADAMTS), and mechanical lubrication of the joint surface.