Thymosin Beta 4 (Tβ4) is a naturally occurring 43-amino acid thymic peptide and one of the most abundant intracellular peptides in mammalian cells, where its primary biochemical function is sequestering G-actin monomers to regulate actin polymerization and cytoskeletal dynamics. Beyond its structural role, Tβ4 acts as a potent extracellular signaling molecule that promotes cell migration, angiogenesis, extracellular matrix remodeling, and multi-tissue regeneration. It has demonstrated remarkable healing activity across diverse tissue types including skin wounds, cardiac tissue following myocardial infarction, corneal injuries, tendons, ligaments, and the central nervous system following traumatic or ischemic damage. Its anti-inflammatory properties — mediated in part through NF-κB suppression — and its ability to upregulate laminin-5 in keratinocytes further enhance its profile as a broad-spectrum regenerative research compound. The synthetic peptide analog TB-500 is a soluble fragment of Tβ4 commonly used in research settings.
