Overview
Biological Rat Tissue Factor (TF) is a transmembrane glycoprotein that initiates the extrinsic coagulation cascade upon vascular injury. It binds Factor VII/VIIa to form a complex that activates downstream clotting factors. Rat TF shares structural homology with human TF but exhibits species-specific activity, making it valuable for translational research. In laboratory settings, rat TF is typically sourced from recombinant expression systems or tissue extracts. Its standardized activity is measured in thromboplastin units (TU), with commercial preparations often including stabilizers like bovine serum albumin (BSA) to maintain functionality during storage.
Physical and Chemical Properties
Rat TF exists as a single-chain polypeptide with a molecular weight ranging 45-50 kDa, depending on glycosylation patterns. The protein consists of extracellular, transmembrane, and cytoplasmic domains, with the extracellular portion containing the Factor VII binding site. In solution, TF exhibits optimal stability at neutral pH (7.0-7.4) and requires calcium ions for functional activity. Lyophilized formulations retain activity for years when stored at -20°C, while liquid preparations typically have shorter shelf lives (weeks to months). Purity is commonly assessed via SDS-PAGE, with major vendors guaranteeing ≥90% purity by densitometry.
Main Applications
The primary use of rat TF lies in creating preclinical models of thrombosis and hemostasis. Researchers employ it to study arterial/venous clot formation, evaluate antithrombotic drugs, and investigate coagulopathies in rodent systems. Diagnostic manufacturers incorporate rat TF into calibration kits for coagulation analyzers, particularly for rodent-specific assays. Some specialized applications include tissue engineering (to assess scaffold blood compatibility) and cancer research (studying TF's role in tumor metastasis). Recent advances explore its utility in nanoparticle-based drug delivery systems targeting thrombotic sites.
Safety and Storage
As a biological material of rodent origin, rat TF requires Biosafety Level 2 (BSL-2) handling precautions. Use nitrile gloves and safety goggles when reconstituting lyophilized powder, and perform procedures in a laminar flow hood if generating aerosols. For storage, aliquot reconstituted solutions to minimize freeze-thaw cycles. Include protease inhibitors (e.g., aprotinin) in working solutions if extended room-temperature use is required. Contamination risks increase significantly after reconstitution - discard unused portions beyond 24 hours unless preserved with 0.1% sodium azide (incompatible with cell-based assays).
B2B Procurement Guide
When sourcing rat TF commercially, prioritize vendors providing: 1) Certificate of Analysis with activity (TU/mg) and endotoxin specifications, 2) batch-to-b consistency data, and 3) species reactivity validation (avoid cross-reactive preparations). For bulk orders (>100mg), negotiate customized formulation options (e.g., carrier-free versions for antibody production). Lead times average 4-6 weeks for GMP-grade material. Consider requesting pre-shipment samples for critical applications. Logistics should guarantee cold chain integrity - dry ice shipment is standard for international orders.
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