Overview
Human Endothelial Factor (HEF) is a secretory protein produced by vascular endothelial cells, playing pivotal roles in angiogenesis and vascular homeostasis. It exists in multiple isoforms with distinct biological activities, including both pro- and anti-angiogenic effects depending on cellular context. First identified in the 1990s, HEF has become a key target in understanding pathological conditions like cancer metastasis and ischemic diseases. Its concentration gradients guide blood vessel formation, making it indispensable for developmental biology and regenerative medicine research.
Physical and Chemical Properties
HEF is a moderately sized glycoprotein with molecular weights varying between 20-30 kDa due to alternative splicing and post-translational modifications. The protein exhibits heat lability, losing activity above 60°C, and is stable in pH 6-8 buffers. Its tertiary structure contains conserved heparin-binding domains critical for receptor interaction. Analytical techniques like circular dichroism confirm its β-sheet dominant conformation. The protein shows UV absorbance maxima at 280 nm (aromatic residues) with extinction coefficients ~1.2 mL/(mg·cm).
Main Applications
In pharmaceutical development, HEF serves as a biomarker for endothelial dysfunction in cardiovascular diseases. Researchers use recombinant HEF to stimulate in vitro tube formation assays, a gold standard for angiogenesis studies. Oncology laboratories employ HEF inhibitors to investigate anti-angiogenic cancer therapies. Emerging applications include tissue engineering, where HF-coated scaffolds enhance vascularization of artificial organs. Diagnostic kits quantify HEF levels to assess endothelial damage in sepsis and diabetes.
Safety and Storage
Lyophilized HEF remains stable for 24 months at -20°C when desiccated. Reconstituted solutions should be aliquoted to avoid repeated freeze-thaw cycles, which cause protein aggregation. Use sterile endotoxin-free buffers for biomedical applications. Handling requires lab coats, gloves, and eye protection. While not classified as acutely toxic, avoid inhalation of powder during reconstitution. Dispose of waste following institutional guidelines for biological materials.
B2B Procurement Guide
Reputable suppliers provide certificates of analysis detailing purity (HPLC/SDS-PAGE), biological activity (EC50 in cell assays), and endotoxin levels. For drug development projects, request GMP-grade material with full traceability documentation. Bulk purchases (100+ mg) often qualify for tiered pricing. Consider supplier validation services, including sequence verification by mass spectrometry. Lead times for custom modifications (tagged variants, species-specific isoforms) typically range 8-12 weeks.
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