Thymosin Alpha 1

Thymosin Alpha-1 (TA-1) is a 28-amino acid peptide originally isolated from thymosin fraction 5, a bovine thymic extract, by Dr. Allan Goldstein and colleagues in the 1970s. The native sequence corresponds to the N-terminal region of prothymosin alpha, a ubiquitously expressed nuclear protein. TA-1 was among the earliest thymic peptides to be characterized and chemically synthesized, and it has since accumulated one of the longest research histories in immunomodulatory peptide biology.

At the molecular level, TA-1 functions as a toll-like receptor (TLR) agonist—specifically TLR2 and TLR9—activating innate immune signaling through MyD88-dependent pathways in dendritic cells and T lymphocytes. This mechanism drives dendritic cell maturation, promotes Th1-polarized T cell responses, and enhances NK cell cytotoxicity in preclinical models. The downstream effect is a context-dependent potentiation of adaptive immune activity, which has made TA-1 the subject of research in viral infection models, oncological immune escape studies, and vaccine adjuvancy protocols.

Supplied as ≥99% HPLC-verified lyophilized powder, MW ~3,108.45 Da, with a full Certificate of Analysis.

For research and laboratory use only. Not for human consumption.

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