Overview
Tissue Polypeptide Antigen (TPA) is a complex of cytokeratin fragments (8, 18, 19) released during cell turnover. Initially identified in malignant tissues, it now serves as a non-specific biomarker for epithelial-derived cancers. Unlike single-molecule markers, TPA reflects overall proliferative activity, making it useful for monitoring disease burden. In clinical practice, TPA levels correlate with tumor aggressiveness in breast, lung, and gastrointestinal cancers. Its detection via immunoassays complements imaging and histopathology. Research-grade TPA is essential for developing diagnostic kits and studying cancer biology mechanisms.
Physical and Chemical Properties
TPA consists of intermediate filament proteins with molecular weights ranging 8-45 kDa. The antigenic epitopes remain stable in pH 7-9 buffers but degrade under repeated freeze-thaw cycles. Lyophilized formulations typically contain stabilizers like BSA or trehalose. As a protein complex, TPA lacks a defined melting point but denatures above 60°C. Its solubility depends on buffer ionic strength—phosphate-buffered saline (PBS) is commonly used. Shelf life extends to 2 years when stored properly, with activity verified by ELISA against WHO standards.
Main Applications
TPA’s primary use is in oncology for monitoring chemotherapy response and detecting recurrence. Elevated serum levels often precede radiographic evidence of progression. It’s included in multi-marker panels for cancers like NSCLC and bladder carcinoma. Beyond diagnostics, TPA aids drug development by quantifying cytolytic effects in preclinical models. Some autoimmune diseases (e.g., cirrhosis) also show elevated TPA due to epithelial damage, though this requires differential diagnosis. Research applications include studying epithelial-mesenchymal transition (EMT) pathways.
Safety and Storage
While TPA itself isn’t toxic, handling follows biosafety level 1 (BSL-1) protocols—gloves and lab coats are mandatory. Avoid inhalation of lyophilized powder. Spills should be neutralized with disinfectants like 70% ethanol. Long-term storage requires airtight containers with desiccants at -20°C. Reconstituted solutions are stable for 1 week at 2-8°C with protease inhibitors. Shipping mandates cold chain compliance (dry ice for international transport). Always verify certificate of analysis (CoA) for endotoxin levels (<1 EU/μg).
B2B Procurement Guide
When sourcing TPA, prioritize suppliers with ISO 13485 certification for in vitro diagnostic (IVD) use. Key specifications include: ≥95% purity (SDS-PAGE), low endotoxin, and batch-to-batch consistency validated by monoclonal antibodies. For clinical trials, ensure materials meet FDA/EMA guidelines on biomarker reproducibility. Bulk purchases (10+ mg) often qualify for 15-20% discounts. Emerging markets like China offer cost-effective alternatives but require rigorous QC checks. Always request sample datasets (e.g., ROC curves for sensitivity/specificity).
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