Thymalin

Thymalin emerged from thymic peptide research conducted by Vladimir Morozov, Vladimir Khavinson, and collaborators during the 1970s and early 1980s. Researchers used mild acid extraction of thymic tissue to isolate naturally occurring peptide fractions and investigated their influence on immune-cell differentiation and regulatory pathways.

Early experimental work characterized Thymalin as a thymus-derived polypeptide preparation with activity in T-lymphocyte-associated systems. Research subsequently examined its influence on cellular differentiation, cyclic nucleotide signaling, cytokine production, and immune pathway activity.

Further biochemical investigation of Thymalin identified individual low-molecular-weight peptide components within the complex, including the dipeptide Glu-Trp, providing a basis for subsequent research into synthetic thymic peptide regulators.

CAS / Registry #: 79621-14-0
Compound Type: Thymus-derived polypeptide complex
Composition: Mixture of low-molecular-weight thymic peptides
Molecular Formula: Not applicable as a single formula
Molecular Weight: Not applicable as a single molecular weight
PubChem ID: No definitive PubChem compound ID for the complete Thymalin polypeptide complex

The U.S. National Library of Medicine's MeSH database identifies Thymalin under registry number 79621-14-0 and classifies it among thymus hormones.

Important: Thymalin should not be chemically equated with Thymulin. Thymulin is a separately defined nine-amino-acid thymic peptide with its own molecular formula, molecular weight, CAS number, and PubChem record.

Thymalin has been investigated in immune, hematopoietic, cellular, and aging-associated experimental models. Research has particularly examined its interaction with T-lymphocyte differentiation and cellular markers involved in immune-system development.

Key Areas of Research:

• Immune: T-lymphocyte activity, differentiation, and signaling
• Hematopoietic: Stem-cell differentiation and maturation pathways
• Molecular: Cytokine signaling and intracellular regulatory pathways
• Cellular: Differentiation markers and immune-cell development
• Aging: Age-associated changes in thymic and immune regulation

Experimental research reported that Thymalin influenced markers associated with hematopoietic stem-cell differentiation, including reductions in CD44 and CD117 expression alongside increased expression of CD28, a marker associated with mature T lymphocytes.

Earlier studies also examined Thymalin's relationship with T-lymphocyte differentiation antigens and intracellular signaling systems, while subsequent research expanded into broader questions involving immune regulation and aging-associated biology.

Together, these investigations make Thymalin a distinct research platform for examining thymic peptide biology, immune-cell differentiation, hematopoietic signaling, and age-associated changes in immune regulatory pathways.

Morozov V.G., Khavinson V.Kh. (1997). International Journal of Immunopharmacology, 19(9–10):501–505. PubMed ID 9637345.

Khavinson V.Kh., Kozhemiakin A.L., Morozov V.G., Kozhemiakin L.A. (1990). The effect of Thymalin on biochemical and immunological indices of lymphocyte differentiation and functional activity. Voprosy Meditsinskoi Khimii, 36(3):41–43.

Khavinson V.Kh. et al. (2020). Thymalin: Activation of Differentiation of Human Hematopoietic Stem Cells. Bulletin of Experimental Biology and Medicine, 170(1):118–122.