Overview
Human B-Cell Activating Factor (BAFF), also known as TNFSF13B or BLyS, is a cytokine belonging to the tumor necrosis factor (TNF) superfamily. It plays a pivotal role in the survival, proliferation, and maturation of B cells, which are essential for adaptive immunity. BAFF is produced by myeloid cells and binds to receptors such as BAFF-R, TACI, and BCMA. BAFF is widely studied for its involvement in autoimmune diseases like systemic lupus erythematosus (SLE) and rheumatoid arthritis. Overexpression of BAFF has been linked to B-cell hyperactivity, making it a target for therapeutic interventions. Recombinant BAFF is commonly used in research to study B-cell biology and develop novel treatments.
Physical and Chemical Properties
BAFF is a type II transmembrane protein that can be cleaved to release a soluble form. The active form is a homotrimer with a molecular weight of approximately 31 kDa per monomer. It is typically supplied as a lyophilized powder or liquid solution, soluble in aqueous buffers like PBS or Tris-HCl. The protein is sensitive to denaturation and proteolytic degradation, requiring careful handling and storage. Its biological activity is often assessed using cell-based assays, such as B-cell proliferation tests. BAFF's stability depends on pH and temperature, with recommended storage at -20°C to preserve functionality.
Main Applications
BAFF is primarily used in immunology research to investigate B-cell development and function. It is a key tool in studying autoimmune diseases, where aberrant BAFF signaling contributes to pathology. Researchers use recombinant BAFF to stimulate B cells in vitro or in animal models. In therapeutics, BAFF inhibitors like belimumab (a monoclonal antibody targeting BAFF) are approved for treating SLE. BAFF is also explored in cancer immunotherapy, as it can enhance B-cell responses against tumors. Additionally, BAFF assays are employed in drug discovery to screen potential inhibitors or modulators.
Safety and Storage
BAFF should be handled with standard laboratory precautions, including gloves and protective eyewear. Avoid inhalation or direct contact with skin or eyes. In case of exposure, rinse thoroughly with water and seek medical advice if irritation persists. For storage, lyophilized BAFF should be kept at -20°C in a desiccated environment to prevent moisture absorption. Reconstituted solutions are stable for short-term use at 4°C (up to one week) but should be aliquoted and frozen for long-term preservation. Avoid repeated freeze-thaw cycles to maintain activity.
B2B Procurement Guide
When procuring BAFF for research or industrial use, prioritize suppliers with certified quality control measures. Key specifications include purity (>95% by SDS-PAGE), low endotoxin levels (<1 EU/µg), and verified biological activity. Request certificates of analysis (CoA) for batch-to-batch consistency. Pricing varies based on quantity, purity, and supplier reputation. Bulk purchases may offer discounts, but ensure proper storage capacity. Consider lead times and shipping conditions, especially for international orders. Collaborate with suppliers who provide technical support and customization options, such as conjugation or labeling services.
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