TB-500 / Thymosin Beta-4: Actin-Binding and Angiogenesis Research

TB-500 is a synthetic 17-residue peptide derived from the active region of Thymosin Beta-4 (TB4), a naturally occurring 43-residue actin-sequestering protein. The fragment retains the central actin-binding motif (LKKTETQ) responsible for many of TB4's reported biological activities.

In published in vitro work, researchers have examined TB-500 in the context of endothelial cell migration assays, tubule formation in Matrigel, and modulation of myocardial cell survival under hypoxic stress. The peptide's small size and high water solubility make it amenable to standard cell-culture protocols.

Mechanistically, TB-500's ability to sequester G-actin monomers is hypothesized to regulate actin polymerization dynamics, which in turn modulates cell motility. Comparative studies with BPC-157 frequently appear in the literature, though the two peptides act through entirely distinct molecular pathways.

Storage and reconstitution follow the standard lyophilized-peptide protocol: -20°C dry, reconstitute with bacteriostatic water, refrigerate working stocks and use within 2–4 weeks.

For in vitro research use only. Not for human or veterinary use.