TB-500 Research Overview: Thymosin Beta-4 Fragment Studies

TB-500 is a synthetic fragment of Thymosin Beta-4 (Tβ4), a 43-amino-acid protein involved in actin polymerization and cell migration. It is the second most studied cytoprotective peptide after BPC-157. This overview summarizes the published research.

Molecular Profile

Mechanism of Action (Published Research)

TB-500's primary studied mechanism is actin sequestration and polymerization. Thymosin Beta-4 binds G-actin monomers and regulates their assembly into F-actin filaments, which are essential for cell structure, migration, and division. In preclinical models, TB-500 has been observed to promote endothelial cell migration, modulate NF-kB inflammatory signaling, and promote blood vessel formation in tissue models.

Published Research Areas

Cardiac models: Hinkel et al. (2015) observed effects in porcine cardiac tissue models following ischemic events. Multiple studies have examined Tβ4 in post-MI remodeling models.

Dermal models: Published wound biology studies observed accelerated re-epithelialization and keratinocyte migration in animal models.

Corneal models: Tβ4 has been studied in corneal tissue repair models, with one formulation (RGN-259) entering clinical trials for ocular surface conditions.

Neurological models: Published studies examined Tβ4 in CNS injury models, observing effects on oligodendrocyte differentiation and myelination.

Compared to BPC-157

BPC-157 and TB-500 are frequently referenced together but operate through different pathways. BPC-157 is primarily studied for NO-mediated cytoprotection and GI biology. TB-500 is studied for actin-dependent cell migration and vascular biology. See our detailed comparison for a full breakdown.

Research Availability

TB-500 is available at Pepta Labs with third-party COA. Also available in research bundles with BPC-157 — see bundles.