Overview
Lymphocyte Stimulating Factor (LSF) is a cytokine or protein complex that specifically targets lymphocytes, including T-cells and B-cells, to enhance their proliferation and functional activity. It is a critical tool in immunology research and biopharmaceutical development, particularly for studying immune responses and designing immunotherapies. LSF is typically produced through recombinant DNA technology or purified from biological sources. Its activity is measured in units based on standardized lymphocyte proliferation assays. The factor is used across academic, clinical, and industrial settings to modulate immune system behavior.
Physical and Chemical Properties
LSF exists as a protein or glycoprotein with variable molecular weight depending on its isoform and post-translational modifications. The lyophilized form is stable at -20°C for years, while reconstituted solutions typically maintain activity for weeks at 4°C when properly preserved. The factor is sensitive to denaturation by heat, extreme pH, and proteolytic enzymes. Its solubility depends on buffer composition, with phosphate-buffered saline (PBS) or culture media being common solvents. Analytical methods like SDS-PAGE and HPLC are used to assess purity and integrity.
Main Applications
In research, LSF is used to study lymphocyte activation mechanisms, immune tolerance, and autoimmune diseases. It serves as a positive control in immunological assays and a culture supplement for lymphocyte expansion. Clinically, LSF derivatives are investigated as adjuvants in cancer immunotherapy and vaccine development. Some formulations are explored for treating immunodeficiency disorders. Industrial applications include quality control in biologics manufacturing and as a component in diagnostic kits for immune function assessment.
Safety and Storage
As a biologically active material, LSF requires handling with gloves, lab coats, and eye protection. Aerosol generation should be minimized. Spills must be decontaminated with appropriate disinfectants. For storage, lyophilized LSF should be kept at -20°C or below in a moisture-proof container. Reconstituted solutions are best aliquoted to avoid contamination and stored at -80°C for long-term preservation. Shipping typically requires dry ice for stability maintenance.
B2B Procurement Guide
When sourcing LSF, prioritize suppliers with ISO 13485 or GMP certification for clinical-grade material. Key specifications include: purity (SDS-PAGE/CGE), endotoxin levels (LAL test), sterility, and biological activity (dose-response curve). For research use, small trial quantities (e.g., 10-100 μg) are advisable for initial validation. Bulk purchases (1mg+) may offer cost savings but require stability guarantees. Leading manufacturers include biotech specialists and life science distributors with cold chain logistics capabilities.
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