COMP (Cartilage Oligomeric Matrix Protein), also known as thrombospondin-5. is a multifunctional extracellular matrix (ECM) glycoprotein primarily expressed in cartilage, tendons, ligaments, and synovial tissues. Belonging to the thrombospondin family, it plays a critical role in organizing ECM components, regulating chondrocyte adhesion, and maintaining tissue structural integrity. COMP interacts with collagen types I, II, and IX, as well as other ECM proteins, contributing to matrix stability and biomechanical resilience.
Mutations in the COMP gene are linked to genetic skeletal disorders, such as pseudoachondroplasia and multiple epiphyseal dysplasia, characterized by abnormal cartilage development and early-onset osteoarthritis. In acquired diseases like osteoarthritis (OA) and rheumatoid arthritis (RA), COMP degradation products are released into synovial fluid and serum, making them potential biomarkers for cartilage turnover and disease progression.
COMP antibodies, both polyclonal and monoclonal, are widely used in research and diagnostics. They enable detection of COMP fragments in biological fluids via ELISA, immunohistochemistry, or Western blot, aiding in the study of ECM remodeling mechanisms. These antibodies also help evaluate therapeutic interventions targeting cartilage repair. However, assay specificity can vary due to COMP's complex structure and cross-reactivity with related proteins, necessitating careful validation. Overall, COMP antibodies are essential tools for understanding cartilage biology and pathology.