Overview
Platelet Factor 4 (PF4) is a 70-amino acid protein belonging to the CXC chemokine family, primarily released from platelet α-granules upon activation. It regulates hemostasis by neutralizing heparin-like molecules and modulates immune responses through interactions with neutrophils and monocytes. Discovered in the 1970s, PF4 has gained clinical significance due to its role in heparin-induced thrombocytopenia (HIT), where PF4-heparin complexes trigger antibody formation. Recombinant PF4 is widely used in biochemical assays and diagnostic kit development.
Physical and Chemical Properties
PF4 is a stable, cationic protein with an isoelectric point (pI) of ~9.0. Its tertiary structure includes a conserved chemokine fold stabilized by disulfide bonds between Cys11-Cys36 and Cys12-Cys52. The heparin-binding domain (Lys46-Asn57) is critical for biological activity. In solution, PF4 tends to form tetramers, which dissociate upon heparin binding. It is sensitive to proteolytic degradation; thus, protease inhibitors are recommended in experimental buffers. Lyophilized PF4 remains stable for years when stored desiccated at -80°C.
Main Applications
In research, PF4 is utilized to study thrombosis mechanisms, particularly HIT pathogenesis. Diagnostic laboratories employ PF4 in ELISA-based HIT antibody detection kits. Its anti-angiogenic properties are explored in oncology models targeting tumor vasculature. Pharmaceutical applications include PF4-derived peptides as heparin reversal agents. Recent studies investigate PF4's role in atherosclerosis and inflammatory diseases, leveraging its chemotactic effects on immune cells.
Safety and Storage
PF4 requires careful handling to maintain integrity. Reconstitute lyophilized powder in sterile PBS (pH 7.4) and aliquot to avoid contamination. Working solutions are stable for 1 week at 4°C with 0.1% BSA as carrier protein. For biosafety, use gloves and eye protection. Spills should be neutralized with dilute bleach. Contaminated materials must be autoclaved before disposal. Long-term storage at -80°C in non-frost-free freezers prevents activity loss.
B2B Procurement Guide
When sourcing PF4, prioritize suppliers with ISO 13485 certification for diagnostic-grade material. Key specifications include: ≥95% purity (HPLC/SDS-PAGE), endotoxin levels <1 EU/μg, and absence of preservatives (e.g., azide). Bulk purchasers should request batch-specific CoA validating bioactivity (e.g., heparin-binding assay). For HIT research, consider PF4/heparin complexes pre-coated plates to streamline workflow. Lead times for custom conjugates (e.g., biotinylated PF4) typically range 4-6 weeks.
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