Aggrecan is a critical component for cartilage structure and the function of joints. Its synthesis and degradation are being studied for their roles in cartilage deterioration during joint injury disease and aging.
Biochem/physiol Actions
This molecule produces a rigid, reversibly deformable gel that resists compression. It combines with hyaluronic acid to form very large macromolecular complexes that have an increased hydrohynamic volume and a significant increase (30-40%) in the relative viscosity of the solution.
Components
Aggrecan is a major structural proteoglycan of the cartilage extracellular matrix. It is a large proteoglycan, with a molecular weight greater than 2,500 kDa composed of approximately 100-150 glycosaminoglycan chains attached to a core protein. The majority of these glycosaminoglycan chains are chondroitin/dermatan sulfate. Aggrecan contains three globular domains, G1, G2, and G3, which are involved in aggregation and hylauronan binding, cell adhesion and chondrycte apoptosis.
Caution
Store this product at -20°C. Stored as supplied, this powder shows little decomposition in 3 years when stored properly.
Preparation Note
This product is extracted from articular cartilage, chematographically purified, dialyzed against water, and 0.2 μm filtered prior to lyophilization. Once lyophilized, this powder is essentially salt-free. The product is soluble in water at 2 mg/mL.
A major feature of cartilage deterioration during joint injury and disease is aggrecan degradation and the loss of proteoglycan. Most of the degraded fragments are released into the circulatory system except the G1 domain which accumulates locally in the synovial
Arthritis and rheumatism, 42(1), 129-136 (1999-01-27)
To determine the relationship between matrix metalloproteinases (MMPs), their inhibitors, and the turnover of matrix molecules in articular cartilage from patients with osteoarthritis (OA). Synovial fluid samples were collected from the knees of 54 patients with OA. Radiographic evaluations and
European journal of clinical chemistry and clinical biochemistry : journal of the Forum of European Clinical Chemistry Societies, 32(4), 249-257 (1994-04-01)
Aggrecan, the large aggregating proteoglycan from cartilage contains chondroitin sulphate and keratan sulphate attached to a multidomain protein core. It aggregates by binding to hyaluronan and this is further stabilised by a separate globular link protein. There are two structurally
The Journal of biological chemistry, 274(9), 5777-5781 (1999-02-20)
Aggrecan, the predominant large proteoglycan of cartilage, is a multidomain macromolecule with each domain contributing specific functional properties. One of the domains contains the majority of the keratan sulfate (KS) chain substituents and a protein segment with a proline-rich hexapeptide
Matrix biology : journal of the International Society for Matrix Biology, 17(5), 379-392 (1998-11-20)
The proteoglycan aggrecan is a major component of cartilage, and degradation of aggrecan is associated with aging and a number of pathological conditions. To investigate the effects of the accumulation of G1 domain from degraded aggrecan, we overexpressed the G1
Uncover more about glycosaminoglycans and proteoglycans including the structure of glycosaminoglycans (GAGs), the different types of GAGs, and their functions.
Glycosaminoglycans are large linear polysaccharides constructed of repeating disaccharide units.
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