Vilon

Vilon (Lys-Glu) is a synthetic dipeptide bioregulator derived from the thymus gland, developed by Vladimir Khavinson as part of the peptide bioregulator research programme at the Saint Petersburg Institute of Bioregulation and Gerontology. As one of the smallest bioactive peptides in the bioregulator series, Vilon represents the minimal thymic-derived sequence with measurable immunomodulatory activity.

The dipeptide structure (Lys-Glu, MW 275 Da) makes Vilon the smallest compound in Khavinson's bioregulator peptide series. Despite its minimal size, published research from Khavinson's institute has documented immunological effects in aged animal models including restoration of T lymphocyte proliferative capacity, normalisation of thymulin activity (the thymic hormone produced by thymic epithelial cells that drives T cell maturation), and improvement in natural killer cell activity.

Immunological research with Vilon uses lymphocyte proliferation assays (3H-thymidine incorporation or CFSE dilution by flow cytometry), NK cell cytotoxicity assays (51Cr release against K562 target cells), thymulin bioassay (competitive inhibition of E-rosette formation), and cytokine ELISA (IL-2, IL-6, IFN-gamma) in stimulated lymphocyte cultures.

The epigenetic mechanism proposed for Vilon follows Khavinson's bioregulator hypothesis: Lys-Glu interacts with chromatin and modulates promoter accessibility for thymus-specific gene expression, restoring transcriptional patterns altered by thymic involution with age. Published chromatin immunoprecipitation data from Khavinson's group has examined histone acetylation changes following Vilon treatment in thymic epithelial cell models.

Comparison with Thymalin (polypeptide thymic bioregulator) and Thymosin Alpha-1 (clinically validated thymic peptide) in parallel immune assays allows researchers to characterise the minimal effective pharmacophore for thymic bioregulator activity and assess whether the dipeptide Vilon replicates the immunological profile of larger thymic preparations.

Vilon and thymic biology research: for thymulin bioassay research, Vilon can be tested for its proposed effect on thymic epithelial thymulin production. Thymulin (Facteur Thymique Sérique, FTS) is a nonapeptide hormone produced exclusively by thymic epithelial cells that requires zinc coordination for biological activity and drives T cell maturation. The standard thymulin bioassay measures the ability of thymic epithelial cell conditioned medium to restore azathioprine-sensitive E-rosette formation by thymocytes — a functional T cell marker. Vilon pre-treatment of thymic epithelial cell cultures before conditioned medium collection tests whether the dipeptide modulates thymulin production.