Cartilage extracellular matrix (ECM)

Cartilage extracellular matrix (ECM) is the three-dimensional molecular scaffold chiefly responsible for cartilage's mechanical strength, resilience, and biological activity. It consists of a dense network of *type II collagen*, *aggrecan*, *chondroitin sulfate*, *hyaluronic acid*, and other minor collagens and proteins[1][4][5]. The ECM interacts closely with chondrocytes and stem cells, regulating their fate through both biochemical cues (e.g., growth factors, integrin binding) and biomechanical properties (e.g., stiffness, topography). ECM breakdown is central to conditions such as osteoarthritis, and its restoration is a key therapeutic goal in cartilage regeneration[3][6]. Modern approaches leverage decellularized ECM scaffolds, growth factor supplementation, and nanomaterials to promote ECM regeneration and functional cartilage repair. Specific molecules within the ECM (such as type II collagen, aggrecan) may act as drug targets or biomarkers for disease progression and efficacy monitoring[3][6][7].

Other names

Cartilage ECMCartilage matrixArticular cartilage extracellular matrix

Induction of chondrogenic differentiation (e.g., KGN induces mesenchymal stem cells to become chondrocytes)\nGrowth factor-mediated matrix synthesis\nScaffold-mediated stem cell recruitment\nMatrix metalloproteinase inhibition slows ECM breakdown