Overview
Aggrecan is the predominant proteoglycan in articular cartilage, constituting up to 10% of the tissue's dry weight. This macromolecule belongs to the lectican family and is essential for cartilage's biomechanical properties through its ability to bind water molecules via osmotic pressure. Structurally, aggrecan consists of a core protein (~250 kDa) with three globular domains (G1, G2, G3) and a central glycosaminoglycan (GAG)-attachment region. The GAG chains - primarily chondroitin sulfate (100-150 chains) and keratan sulfate (30-60 chains) - extend from the core protein, creating a bottlebrush-like morphology critical for load-bearing functions.
Physical and Chemical Properties
The molecule exhibits extraordinary hydrodynamic size (Stokes radius ~200nm) due to its extended GAG chains, which account for ~90% of its mass. The high density of carboxyl and sulfate groups (1-2 negative charges per disaccharide unit) creates strong polyanionic characteristics. In solution, aggrecan demonstrates non-Newtonian viscosity and shear-thinning behavior. Its isoelectric point ranges between 2.5-3.5 due to acidic GAGs. The proteoglycan forms stable aggregates via G1 domain interactions with hyaluronic acid and link protein, creating macromolecular complexes exceeding 50 MDa in cartilage matrix.
Main Applications
In biomedical research, aggrecan serves as: 1) A critical component in 3D cartilage tissue engineering scaffolds, 2) A substrate for studying matrix metalloproteinase (MMP) activity in osteoarthritis, and 3) A biomarker for cartilage degradation when measuring cleaved fragments (ARGS-aggrecan) in synovial fluid. Industrial applications include its use in diagnostic kits for joint diseases and as a quality control standard for glycosaminoglycan analysis. Recent advances employ recombinant aggrecan domains for targeted drug delivery to cartilage tissues.
Safety and Storage
While non-toxic, aggrecan powder requires careful handling to prevent inhalation exposure. Use nitrile gloves and safety goggles when reconstituting lyophilized material. Aqueous solutions are prone to bacterial growth - add 0.02% sodium azide for long-term storage at 4°C. For structural integrity preservation, avoid freeze-thaw cycles of solutions. Lyophilized material remains stable for years at -20°C in sealed containers with desiccant. Shipping typically requires dry ice for temperature-sensitive variants.
B2B Procurement Guide
When sourcing aggrecan, specify: 1) Tissue source (human recombinant avoids batch variability), 2) Degree of sulfation (affects biological activity), and 3) Presence of intact G1 domain for aggregation studies. Research-grade material typically has >90% purity by SDS-PAGE. Leading suppliers include Sigma-Aldrich (bovine origin), Bio-Techne (human recombinant), and Amsbio (disease-state variants). For bulk orders (>100mg), request lot-specific characterization data including GAG:protein ratio and endotoxin levels (<1EU/mg for in vivo use).
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