Overview
Biglycan is a small leucine-rich proteoglycan (SLRP) found in the extracellular matrix (ECM) of connective tissues. It consists of a core protein with two glycosaminoglycan (GAG) chains, typically chondroitin sulfate or dermatan sulfate. Named for its 'big' GAG chains, it interacts with collagen fibrils and growth factors like TGF-β to modulate tissue structure and repair. First identified in bone and cartilage, biglycan is now recognized for its roles in cardiovascular, musculoskeletal, and renal systems. Its dysregulation is linked to fibrosis, osteoporosis, and cancer metastasis, making it a target for therapeutic research.
Physical and Chemical Properties
The core protein of biglycan has a molecular weight of ~38-45 kDa, increasing to ~100-150 kDa with GAG attachments. Its structure includes leucine-rich repeats (LRRs) that mediate protein-protein interactions. The GAG chains confer high negative charge, influencing solubility and binding affinity. Biglycan is stable in neutral pH buffers but degrades under extreme pH or enzymatic cleavage (e.g., metalloproteinases). Its solubility depends on ionic strength—precipitating at high salt concentrations. Purified forms are typically lyophilized for long-term storage at -20°C or below.
Main Applications
In research, biglycan is used to study ECM assembly, particularly collagen fibrillogenesis. It serves as a biomarker for fibrosis and osteoarthritis due to its upregulated expression in diseased tissues. Therapeutically, recombinant biglycan is explored for bone regeneration and wound healing. Its ability to sequester TGF-β makes it a candidate for anti-fibrotic drugs. In cancer, biglycan's dual role—promoting or inhibiting tumor growth—is under investigation for targeted therapies.
Safety and Storage
Handling biglycan requires standard lab precautions: gloves, goggles, and avoidance of aerosol formation. Though non-toxic, it may trigger immune responses if injected in vivo. For storage, lyophilized biglycan should be kept at -20°C or -80°C in airtight containers. Solutions require protease inhibitors (e.g., EDTA, PMSF) and sterile filtration to prevent degradation. Avoid repeated freeze-thaw cycles to maintain stability.
B2B Procurement Guide
When sourcing biglycan, prioritize suppliers providing certificates of analysis (CoA) for purity (>95% by SDS-PAGE) and endotoxin levels (<1 EU/μg). Recombinant variants (e.g., human, murine) offer consistency but may lack post-translational modifications present in native forms. Bulk pricing is negotiable for research institutions, with discounts at 10+ mg quantities. Lead times vary (2-8 weeks) due to custom purification. Consider scalability for clinical-grade production, ensuring compliance with GMP standards if applicable.
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