TB-500 is a synthetic peptide corresponding to the active region of Thymosin Beta-4 (Tβ4), a 43-amino acid naturally occurring protein. TB-500 encompasses the actin-binding domain of Tβ4, centered on the sequence LKKTETQ (amino acids 17-23), and has a molecular weight of approximately 4,921 Da. Thymosin Beta-4 and its active fragments have been the subject of extensive preclinical research focused on cell migration, wound repair, and anti-inflammatory mechanisms.
The primary mechanism investigated in preclinical models involves TB-500’s interaction with monomeric G-actin. By sequestering G-actin, the compound modulates the G-actin/F-actin equilibrium, influencing cytoskeletal dynamics critical to cell migration and morphogenesis. In fibroblast and endothelial cell migration assays, TB-500 treatment has been associated with enhanced cell motility and accelerated wound closure in scratch-wound models. This actin-regulatory mechanism distinguishes TB-500 from growth factor-dependent migration pathways.
In vitro angiogenesis studies using endothelial tube formation assays have demonstrated that TB-500 promotes capillary-like network formation. VEGF and angiopoietin expression analysis in treated endothelial cultures suggests TB-500 modulates angiogenic signaling through both direct and indirect mechanisms. Anti-inflammatory research has shown that TB-500 treatment reduces NF-κB activation and pro-inflammatory cytokine expression (TNF-α, IL-1β, IL-6) in macrophage activation models.
Cardiac research applications have investigated Tβ4 and TB-500 in cardiomyocyte survival assays, where the compound has demonstrated cytoprotective properties under oxidative stress conditions. Hair follicle research using dermal papilla cell cultures has identified TB-500-mediated upregulation of genes associated with the hair growth cycle, including Wnt pathway components and stem cell markers.
Erosyn Labs provides TB-500 as a lyophilized powder at ≥98% purity by HPLC with mass spectrometry identity confirmation. A Certificate of Analysis accompanies each lot. Reconstitution in bacteriostatic water or sterile 0.9% sodium chloride is recommended. Store lyophilized material at -20°C. Reconstituted solutions should be maintained at 2–8°C and used within 30 days. Avoid repeated freeze-thaw cycles and handle using standard aseptic technique.
For research and laboratory use only. Not for human consumption.
