Chondrocytes, MMPs, and Aggrecanases

The combination "Chondrocytes, MMPs, and Aggrecanases" refers to the key cellular and enzymatic components involved in cartilage homeostasis and degradation. **Chondrocytes** are the primary cells that synthesize and maintain the extracellular matrix (ECM) of cartilage, including collagen and the proteoglycan aggrecan. **Matrix metalloproteinases (MMPs)** are a family of zinc-dependent endopeptidases that degrade various ECM components, and their overexpression is linked to cartilage destruction in osteoarthritis (OA) and rheumatoid arthritis (RA). **Aggrecanases**, especially those in the ADAMTS family (notably ADAMTS-4, ADAMTS-5), specifically cleave the aggrecan core protein and are critical in the early stages of cartilage degradation. While MMPs and aggrecanases both degrade aggrecan, they do so at different cleavage sites[1][4]. Therapies targeting these enzymes aim to prevent ECM loss and slow progression of OA and RA, but clinical translation is challenged by issues of selectivity and toxicity[4].

Other names

ChondrocyteMatrix metalloproteinases (MMPs)AggrecanasesADAMTS proteases

Inhibition of protease-mediated ECM (extracellular matrix) degradation Prevention of aggrecan breakdown by selective ADAMTS (aggrecanase) inhibition[4]