Overview
Galectin-3 is a member of the lectin family, specifically binding β-galactoside sugars. It plays critical roles in cell-cell adhesion, immune regulation, and apoptosis. Unlike other galectins, it is unique due to its chimeric structure, containing a carbohydrate-recognition domain (CRD) and a non-lectin N-terminal region. This protein is widely studied for its dual role in cancer—acting as both a tumor suppressor and promoter depending on context. Its expression is linked to metastasis in carcinomas, making it a biomarker for aggressive cancers like thyroid and breast malignancies.
Physical and Chemical Properties
Galectin-3 is a 30-35 kDa protein with an isoelectric point around 8.5–9.0. It forms oligomers under physiological conditions, enhancing its binding avidity to multivalent glycoconjugates. The protein is stable in neutral pH buffers but may degrade under extreme acidic or alkaline conditions. Its solubility in aqueous solutions makes it suitable for in vitro assays. However, aggregation can occur at high concentrations, requiring the use of reducing agents like DTT or β-mercaptoethanol in storage buffers to maintain functionality.
Main Applications
In research, galectin-3 is used to study tumor microenvironments, fibrosis (e.g., cardiac and hepatic), and inflammatory diseases like asthma. Commercially, it serves as a diagnostic marker; ELISA kits detect its elevated levels in heart failure (e.g., FDA-cleared BG Galectin-3™ test). Pharmaceutical companies target galectin-3 with inhibitors (e.g., modified citrus pectin) for anti-fibrotic and anti-cancer therapies. Its role in modulating macrophage polarization also makes it relevant for immunotherapy development.
Safety and Storage
While galectin-3 is non-toxic, standard lab precautions (gloves, goggles) are recommended. Lyophilized powder should be stored at -20°C and reconstituted in sterile PBS or Tris buffers. Avoid repeated freeze-thaw cycles to prevent protein denaturation. For long-term storage, aliquot solutions and add glycerol (up to 50%) to prevent ice crystal formation. Contamination risks are minimal, but endotoxin levels should be confirmed for cell-based assays.
B2B Procurement Guide
When sourcing galectin-3, prioritize suppliers with ISO certification and batch-specific CoAs. Key specifications include purity (>90% by SDS-PAGE), endotoxin levels (<1 EU/μg), and functional activity (e.g., sugar-binding assays). Bulk buyers should negotiate discounts for orders above 10 mg. Consider recombinant variants (e.g., human, murine) for species-specific studies. Lead times vary; ensure cold-chain logistics for international shipments.
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