Thymosin Alpha-1

What is Thymosin Alpha-1?

Thymosin Alpha-1 (Tα1) is a naturally occurring 28-amino-acid peptide originally isolated from thymic tissue. It is N-terminally acetylated and circulates in human plasma. Tα1 is one of the few research peptides with regional regulatory approval as a therapeutic (e.g., Zadaxin in some countries) but is supplied here strictly for laboratory research.

Mechanism of action (preclinical evidence)

Tα1 is reported to influence T-cell maturation via Toll-like receptor (TLR) signaling — most notably TLR9 in plasmacytoid dendritic cells and TLR2 in monocyte-derived cells. Downstream effects include modulation of cytokine production (IFN-γ, IL-10) and dendritic cell differentiation. The peptide does not appear to act through a single high-affinity receptor; rather, it engages multiple immune cell populations to modulate balance between Th1, Th2, and regulatory responses in preclinical and clinical research.

Research applications

• T-cell maturation and thymopoiesis models
• Innate immunity studies (TLR signaling)
• Dendritic cell differentiation research
• Cytokine response profiling (Th1/Th2/Treg balance)
• Antiviral and tumor immunology preclinical models

Storage and handling

Store the lyophilised vial at -20 °C, sealed and protected from light. Reconstituted Tα1 should be aliquoted and used promptly; 28-amino-acid peptides are sensitive to aggregation under repeated freeze-thaw.

Regulatory status

Tα1 is approved as a medicine in some jurisdictions (e.g., Zadaxin/thymalfasin) but is supplied by Peptra Labs strictly as a research-grade compound. Verify local regulatory and import requirements.