Thymosin Alpha-1 (Tα1) - Immunomodulatory Thymic Peptide

Thymosin Alpha-1 for Research: Complete Scientific Overview

Thymosin Alpha-1 (Tα1) is a synthetic 28-amino acid peptide (Ac-Ser-Asp-Ala-Ala-Val-Asp-Thr-Ser-Ser-Glu-Ile-Thr-Thr-Lys-Asp-Leu-Lys-Glu-Lys-Lys-Glu-Val-Val-Glu-Glu-Ala-Glu-Asn) that was first isolated from Thymosin Fraction 5, a partially purified extract of the bovine thymus gland. Discovered by Dr. Allan Goldstein and colleagues in the 1970s at the George Washington University, Tα1 represents the biologically active component of the thymus responsible for T-cell maturation and immune regulation. Thymosin Alpha-1 is distinct from other thymic peptides (such as Thymosin Beta-4) and exerts its effects primarily through immunomodulatory mechanisms, making it a cornerstone of thymic peptide research.

Mechanism of Action

Thymosin Alpha-1 exerts its immunomodulatory effects through multiple well-characterized mechanisms that collectively enhance both innate and adaptive immunity:

• T-cell Maturation & Differentiation (Thymic Function): Promotes the maturation of precursor T-cells (thymocytes) into functional, immunocompetent T-lymphocytes in the thymus, enhancing the production of CD4+ helper T-cells and CD8+ cytotoxic T-cells.
• Cytokine Modulation (Th1 Polarization): Enhances the production of Th1-type cytokines (IL-2, IFN-γ, IL-12) while modulating pro-inflammatory responses, shifting the immune balance toward cell-mediated immunity, which is critical for antiviral and antitumor responses.
• TLR9 Signaling Activation (Innate Immunity): Activates Toll-like receptor 9 (TLR9) signaling pathways, leading to MyD88-dependent activation of NF-κB and IRF pathways, resulting in increased expression of pro-inflammatory cytokines and type I interferons.
• Dendritic Cell Activation & Antigen Presentation: Promotes the maturation and activation of dendritic cells, enhancing their antigen-presenting capacity, upregulation of MHC class II and co-stimulatory molecules (CD80, CD86), and T-cell priming.
• Natural Killer (NK) Cell Enhancement: Increases NK cell activity, cytotoxicity, and cytokine production (IFN-γ), enhancing innate immune surveillance against virally infected cells and tumor cells.
• Macrophage Activation: Enhances macrophage phagocytic activity, cytokine production (TNF-α, IL-6, IL-12), and antigen presentation, contributing to innate immune defense.
• Regulatory T-cell (Treg) Modulation: Influences Treg function and immune tolerance mechanisms, potentially preventing excessive inflammation while maintaining immune homeostasis.
• B-cell & Antibody Response Enhancement: Enhances B-cell differentiation and antibody production (IgG, IgA), improving humoral immune responses.

Key Research Applications

• Immunology & Immune System Research: Investigating T-cell development, thymic function, and immune regulation mechanisms using Tα1 as a tool to modulate immune responses.
• Infectious Disease Research (Viral, Bacterial, Fungal): Studying Tα1's immunomodulatory effects in models of viral infection (hepatitis B/C, influenza, HIV), bacterial infection (tuberculosis, sepsis), and fungal infection (candidiasis).
• Immunotherapy & Vaccine Adjuvant Studies: Evaluating Tα1 as an immunoadjuvant to enhance vaccine efficacy, including influenza, hepatitis B, and cancer vaccines.
• Cancer Immunology & Oncoimmunology Research: Investigating Tα1's potential to enhance antitumor immunity in models of melanoma, lung cancer, hepatocellular carcinoma, and other malignancies.
• Autoimmune Disease Research: Studying Tα1's immunomodulatory effects in models of autoimmune diseases (rheumatoid arthritis, multiple sclerosis, type 1 diabetes) where immune regulation is disrupted.
• Immunosenescence & Age-Related Immune Decline: Investigating Tα1's ability to restore immune function in aged animal models and models of thymic involution.
• Thymic Function & T-cell Development Studies: Using Tα1 as a tool to study thymopoiesis, T-cell receptor rearrangement, and positive/negative selection.
• TLR9 Signaling & Innate Immunity Research: Investigating Tα1's role as a TLR9 agonist and its effects on downstream signaling pathways (MyD88, NF-κB, IRF7).
• Immunosuppression & Immune Restoration: Studying Tα1 in models of chemotherapy-induced immunosuppression, radiation injury, and bone marrow transplantation.

The Thymosin Family: Tα1 vs Tβ4 vs Other Thymic Peptides

• Thymosin Alpha-1 (Tα1 - this product): 28-amino acid peptide (Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN); primary function: immunomodulation, T-cell maturation, cytokine regulation (Th1 polarization); mechanism: TLR9 agonist, enhances T-cell, NK cell, dendritic cell function; source: thymus-derived; research focus: infectious disease, cancer immunology, vaccine adjuvants.
• Thymosin Beta-4 (Tβ4): 43-amino acid peptide; primary function: actin-binding, wound healing, angiogenesis, anti-inflammatory; mechanism: actin sequestration, cell migration; source: widely expressed (not thymus-specific); research focus: tissue repair, regenerative medicine.
• Thymulin (Facteur Thymique Sérique - FTS): 9-amino acid nonapeptide (zinc-dependent); primary function: T-cell differentiation and function; source: thymic epithelium; research focus: T-cell maturation, immunosenescence.
• Thymopoietin: 49-amino acid peptide; primary function: T-cell differentiation; source: thymus; research focus: neuromuscular transmission (also known for myasthenia gravis research).

Chemical Information & Handling

CAS Number: 69440-84-2 (Thymosin Alpha-1)
Molecular Formula: C129H215N33O55
Molecular Weight: 3108.3 g/mol
Sequence (3-Letter): Ac-Ser-Asp-Ala-Ala-Val-Asp-Thr-Ser-Ser-Glu-Ile-Thr-Thr-Lys-Asp-Leu-Lys-Glu-Lys-Lys-Glu-Val-Val-Glu-Glu-Ala-Glu-Asn
Sequence (1-Letter): Ac-SDAAVDTSSEITTKDLKEKKEVVEEAEN
Purity: >99% (HPLC)
Form: Lyophilized powder
Solubility: Soluble in water (>10 mg/mL), saline, PBS, and DMSO. Excellent aqueous solubility due to multiple charged residues.
Storage: -20°C (lyophilized), 4°C (reconstituted). Stable for 24 months when stored at -20°C.
Reconstitution: Reconstitute with sterile bacteriostatic water or sterile saline. Gently swirl until fully dissolved. Do not vortex. Aliquot to avoid freeze-thaw cycles.

Each vial contains exactly the indicated net peptide weight. For long-term storage, keep lyophilized powder at -20°C away from light and moisture. Reconstituted solutions should be used within 30 days when stored at 4°C.

Quality Assurance

PeptideVanta's Thymosin Alpha-1 undergoes rigorous quality control including HPLC purity analysis (>99%), ESI-mass spectrometry for molecular weight confirmation (expected 3108.3 Da), TLR9 activation activity confirmation, endotoxin testing (<0.5 EU/mg), sterility testing, and residual solvent analysis. Each batch is accompanied by a Certificate of Analysis (COA) with complete testing results. The peptide is synthesized using solid-phase peptide synthesis (SPPS) with Fmoc chemistry, followed by HPLC purification and lyophilization under sterile conditions.