#Immune | #Regenerative

Thymulin (FTS-Zn)— Zinc-Dependent Thymic Hormone

Thymulin, also known as Facteur Thymique Sérique (FTS), is a nonapeptide hormone produced by the thymic epithelium. Its biological activity is strictly dependent on the presence of zinc. In research, it is a primary marker for evaluating thymic function, T-cell differentiation, and the neuro-endocrine-immune axis.

Compound Name

Thymulin (FTS)

Sequence

Pyr-Ala-Lys-Ser-Gln-Gly-Gly-Ser-Asn

Cofactor

Zinc (Zn²⁺) – Essential for activity

Molecular Weight

858.85 g/mol (Non-complexed)

Primary Research Focus

T-Cell Differentiation & Neuro-Immune Signaling

Regulatory Status

Research Grade Material (RUO)

Sequence Note:

N-terminal pyroglutamic acid (Pyr) confers resistance to aminopeptidases. The peptide forms a 1:1 complex with zinc ions, which induces the active conformation required for receptor binding.

Research Note:

Without zinc, the FTS nonapeptide is biologically inactive in most immune assays.

Store powder at +4°C (short term) or -20°C (long term). Keep desiccated.

Reconstitute with sterile or bacteriostatic water. Avoid vigorous agitation to preserve peptide integrity.

T-Cell Differentiation & Maturation

Thymulin is synthesized by thymic epithelial cells and is critical for the differentiation of T-lymphocytes.

Surface Marker Induction: Induces expression of differentiation markers such as Thy-1, CD3, and CD4 on immature T-cells.
Functional Maturation: Enhances T-cell functions including allogenic cytotoxicity, suppressor function, and interleukin-2 production in in-vitro models.

Neuro-Endocrine-Immune Axis Interaction

Thymulin production is regulated by the neuroendocrine system (GH, prolactin, thyroid hormones).
Pituitary Feedback: Experimental studies demonstrate Thymulin stimulates the release of LH and FSH while inhibiting ACTH in pituitary cell cultures.

Anti-Inflammatory & Analgesic Research

Beyond immune maturation, Thymulin is investigated for its role in regulating inflammatory signaling and nociceptive sensitivity in experimental systems.

Cytokine Modulation: High experimental concentrations have been shown to downregulate pro-inflammatory cytokines such as TNF-α and IL-6 in glial cell models.
Neuropathic Pain Models: Gene therapy models overexpressing Thymulin have demonstrated reductions in neuropathic pain–associated behaviors in rat studies, suggesting a potential neuro-immune interaction.

Research Limitations

Zinc Dependency: Experimental results are highly sensitive to zinc status. Zinc deficiency abolishes Thymulin activity, introducing a confounding variable.
Half-Life: The peptide has a short plasma half-life and is rapidly cleared by the kidneys. Observed biological effects in vivo often require continuous infusion or gene delivery vectors in research settings.

Key Scientific References

Bach, J.-F., et al. (1977). The thymic hormone FTS. International Journal of Immunopharmacology.
Safieh-Garabedian, B., et al. (2012). Thymulin-related peptides: a new class of non-opioid analgesics. British Journal of Pharmacology.
Dardenne, M., & Pleau, J.-M. (1994). Interactions between zinc and thymulin. Pathologie Biologie.

The compound listed below is referenced in research contexts related to the mechanisms discussed in this article.

Thymulin (FTS-Zn)— Zinc-Dependent Thymic Hormone

Compound Name

Sequence

Cofactor

Molecular Weight

Primary Research Focus

Regulatory Status

Sequence Note:

Research Note:

Age Verification Required

GLP2-T

Thymosin Alpha-1 (TA1)

Tesamorelin

TB-500

SS-31

Semax

Selank

GLP3-R

PT-141