TB-500 (Thymosin Beta-4 Fragment)

TB-500 is a synthetic version of Thymosin Beta-4 (TB4), a naturally occurring 43-amino acid peptide found in high concentrations in blood platelets, wound fluid, and various tissues. Thymosin Beta-4 is one of the most abundant proteins in the cytoplasm, comprising up to 0.5-2% of total cellular protein in many cell types. The primary function of TB4 involves regulation of actin, a fundamental protein in cell structure and motility. TB4 sequesters G-actin (monomeric actin) and prevents its polymerization into F-actin (filamentous actin), playing crucial roles in cell migration, wound healing, and tissue regeneration.

TB-500/Thymosin Beta-4 functions through several key mechanisms: **Actin Regulation:** TB4 binds to G-actin with high affinity, preventing spontaneous polymerization. This pool of sequestered actin can be rapidly mobilized during cellular processes requiring cytoskeletal reorganization, such as cell migration and wound healing. **Cell Migration Promotion:** By regulating actin dynamics, TB4 enhances cell motility, which is essential for wound repair. It promotes migration of keratinocytes, endothelial cells, and other cell types involved in healing. **Angiogenesis Stimulation:** TB4 promotes new blood vessel formation by enhancing endothelial cell migration and differentiation. The peptide upregulates various angiogenic factors and promotes capillary tube formation. **Anti-inflammatory Effects:** Research indicates TB4 can modulate inflammatory responses by affecting cytokine production and immune cell activity, potentially reducing excessive inflammation during injury.