Overview
Fas Ligand (FasL) is a pivotal mediator of programmed cell death, primarily expressed in immune cells such as cytotoxic T lymphocytes and natural killer (NK) cells. It belongs to the TNF superfamily and binds to the Fas receptor (CD95), initiating caspase-dependent apoptosis. This mechanism is critical for immune tolerance, cytotoxic T-cell function, and eliminating malignant or infected cells. Research on FasL has expanded into therapeutic applications, including cancer immunotherapy and autoimmune disease modulation. Dysregulation of the FasL-Fas pathway is linked to conditions like lymphoproliferative disorders and hepatitis. Recombinant FasL is commonly used in laboratories to study apoptosis signaling pathways.
Physical and Chemical Properties
FasL exists as a homotrimeric transmembrane protein, with a soluble form generated via metalloproteinase cleavage. The recombinant form used in research typically lacks the transmembrane domain (e.g., extracellular domain residues 103–281). Its molecular weight varies by isoform, with the full-length protein around 40 kDa. As a protein, FasL is sensitive to denaturation by heat, extreme pH, or proteases. It requires storage in stabilizing buffers (e.g., with glycerol or BSA) to maintain activity. Analytical methods like SDS-PAGE and ELISA confirm purity and functionality.
Main Applications
In biomedical research, FasL is employed to investigate apoptosis in cancer cell lines, evaluate immune evasion mechanisms, and develop targeted therapies. For example, FasL-coated nanoparticles are explored for tumor-specific cell death induction. Clinically, FasL modulation is studied in graft-versus-host disease (GVHD) and autoimmune disorders like lupus. However, therapeutic use remains experimental due to risks of systemic toxicity. In vitro, FasL is a key reagent for cytotoxicity assays and T-cell activation studies.
Safety and Storage
FasL requires careful handling due to its apoptosis-inducing activity. Use gloves, lab coats, and eye protection when preparing solutions. Avoid aerosol formation during reconstitution. Lyophilized FasL is stable at -20°C for years; reconstituted solutions should be aliquoted and stored at -80°C to prevent degradation. Dispose of waste following institutional guidelines for bioactive proteins. Contaminated surfaces should be deactivated with 70% ethanol or commercial protein denaturants. Shipping typically requires dry ice for lyophilized forms and cold packs for solutions.
B2B Procurement Guide
When procuring FasL, prioritize suppliers providing detailed batch-specific data, including endotoxin levels (<1 EU/µg) and apoptosis induction efficacy (e.g., ED50 values). Common sources include recombinant human or mouse FasL from vendors like R&D Systems, BioLegend, or PeproTech. For bulk orders, request custom formulations (e.g., carrier-free options) and stability testing. Compare prices per microgram of active protein, not just total quantity. Lead times vary; plan ahead for GMP-grade materials required in preclinical trials.
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