A synthetic fragment of Thymosin Beta-4, studied for its role in actin regulation and cell-migration research.
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TB-500 is a synthetic peptide fragment corresponding to the active region of thymosin beta-4, the body's principal actin-binding protein. It binds monomeric (G-)actin with high affinity, maintaining a mobile pool of actin that cells rely on for migration — a mechanism thought to drive its effects across multiple stages of tissue repair: keratinocyte and fibroblast migration, VEGF-mediated angiogenesis, and macrophage polarization toward a pro-resolution state. Because it appears to act on several repair pathways simultaneously rather than a single target, thymosin beta-4 research has often described it as a "master regulator" of the wound-healing response. Most current evidence comes from preclinical and in vitro models, particularly in wound, tendon, and cardiac-tissue research.
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