Description
TB-500 (Thymosin Beta-4 Fragment)
TB-500 is a synthetic research peptide corresponding to the active actin-binding region (LKKTETQ) of Thymosin Beta-4 (Tβ4) — a naturally occurring protein found in almost all mammalian cells that plays a key role in tissue repair and cellular movement.
Mechanism of Action
- TB-500’s core activity centres on binding to actin, a structural protein essential for cell shape, movement, and division. By interacting with actin, the peptide helps regulate how cells migrate to sites of injury
- Research shows it promotes the formation of new blood vessels, supports collagen deposition, and helps reduce inflammation in preclinical wound repair models (Goldstein et al., 2012)
- Preclinical studies demonstrate it also reduces the formation of scar tissue by decreasing the number of myofibroblasts present at wound sites (Goldstein et al., 2012)
Key Research Findings
- Topical and systemic application of the parent Tβ4 sequence increased wound re-epithelialisation by up to 61% over controls in rodent models, with the actin-binding fragment alone demonstrating comparable repair activity (Philp et al., 2003)
- Rahaman et al. (2024) identified that TB-500’s wound-healing activity in fibroblast models may be partially attributable to its metabolite Ac-LKKTE, highlighting the importance of metabolite profiling in ongoing research
- The structural identity of TB-500 (Ac-LKKTETQ) has been confirmed and characterised by Esposito et al. (2012) using high-resolution mass spectrometry
For research use only. Not intended for use in humans or animals.
References
Esposito, S., Deventer, M., Van Thuyne, W., Delbeke, F. T., & Van Eenoo, P. (2012). https://pubmed.ncbi.nlm.nih.gov/22962027/
Goldstein, A. L., Hannappel, E., Sosne, G., & Kleinman, H. K. (2012). https://pubmed.ncbi.nlm.nih.gov/22074294/
Philp, D., Badamchian, M., Scheremeta, B., Nguyen, M., Goldstein, A. L., & Kleinman, H. K. (2003). https://pubmed.ncbi.nlm.nih.gov/12581422/
Rahaman, K. A., Muresan, A. R., Min, H., Son, J., Kang, M. J., & Kwon, O. S. (2024). https://www.sciencedirect.com/science/article/pii/S1570023224000412











