Overview
Mouse B-Cell Activating Factor (BAFF) is a tumor necrosis factor (TNF) superfamily cytokine essential for B lymphocyte homeostasis. Produced primarily by myeloid cells, it binds to three receptors (BAFF-R, BCMA, and TACI) to regulate B-cell survival and maturation. The protein exists as a homotrimer and plays critical roles in both normal immune function and pathological conditions like autoimmune diseases. First identified in the late 1990s, BAFF has become a key therapeutic target for conditions such as systemic lupus erythematosus (SLE) and rheumatoid arthritis. Recombinant mouse BAFF is widely used in preclinical research to study B-cell biology and evaluate potential immunomodulatory drugs.
Physical and Chemical Properties
Mouse BAFF is a type II transmembrane protein that can be cleaved to release a soluble form. The active soluble fragment consists of 152 amino acids (mouse sequence) with a predicted molecular weight of ~17 kDa per monomer, though it migrates at ~35 kDa on SDS-PAGE due to glycosylation. The native protein forms non-covalent trimers that are stable in physiological conditions. The cytokine maintains activity within pH 6-8 and is sensitive to repeated freeze-thaw cycles. Its biological activity is typically measured by proliferation assays using BAFF-responsive cell lines (e.g., A20 murine B cells), with ED50 values usually ranging between 1-10 ng/mL for high-quality preparations.
Main Applications
In research settings, mouse BAFF is primarily used to: 1) Study B-cell development and survival mechanisms in vitro and in vivo, 2) Establish disease models for autoimmune disorders by inducing excessive B-cell activation, and 3) Screen and validate BAFF-inhibitory drugs (e.g., belimumab analogs). Pharmaceutical companies utilize mouse BAFF in preclinical studies to assess cross-reactivity of human-targeted therapies and understand mechanisms of B-cell malignancies. It's also employed in hybridoma technology to enhance B-cell survival during monoclonal antibody production. Recent applications include CAR-T cell research and vaccine adjuvant development.
Safety and Storage
Recombinant mouse BAFF should be handled using standard laboratory precautions - gloves, lab coat, and eye protection are recommended. Although not classified as hazardous, avoid inhalation of lyophilized powder or direct contact with solutions. Work should be conducted in a biosafety cabinet when handling large quantities. For storage, lyophilized protein remains stable for ≥1 year at -20°C or -80°C. Reconstituted solutions should be aliquoted to avoid contamination and stored at 4°C for short-term use (1-2 weeks) or at -80°C for long-term preservation. Always centrifuge vials before opening to recover all material, and use sterile, endotoxin-free buffers for reconstitution.
B2B Procurement Guide
When sourcing mouse BAFF, prioritize vendors that provide: 1) Certificate of Analysis with verified bioactivity (typically ≥1×10^6 units/mg), 2) Low endotoxin levels (<0.1 EU/μg), 3) Purity >95% by SDS-PAGE, and 4) Species-specific validation (ensure no cross-contamination with human or rat BAFF). For large-scale production needs, consider custom expression services using mammalian systems (e.g., CHO or HEK293 cells) for proper glycosylation. Bulk purchases (10mg+) often reduce per-unit costs by 30-50%. Always request stability data and consider purchasing small test quantities before large orders to confirm performance in your specific assay systems.
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