Peptides Regulating Proliferative Activity and Inflammatory Pathways in the Monocyte/Macrophage THP-1 Cell Line

This in vitro study, published in the International Journal of Molecular Sciences, investigated the effects of the dipeptide Vilon (Lys-Glu) on proliferative activity and inflammatory pathways in the human monocyte/macrophage THP-1 cell line. The research was a collaboration between Italian and Russian groups, combining expertise in cell biology and peptide bioregulators.

The results demonstrated that Vilon exerted significant effects on multiple cell signaling pathways. The peptide modulated proliferative patterns in THP-1 monocytes, with increased phosphorylation of mitogen-activated protein kinases (MAPK), indicating activation of intracellular signaling pathways important for immune response regulation.

• In differentiated macrophages, Vilon inhibited TNF-alpha and IL-6 expression, key pro-inflammatory cytokines
• The anti-inflammatory effect was dose-dependent and time-dependent
• The NF-kB pathway, central to inflammatory regulation, was modulated by the treatment
• The peptide did not affect cell viability at the concentrations tested

The study is particularly relevant for demonstrating that a simple dipeptide (only two amino acids) can exert significant biological effects on innate immune system cells. The dual action — proliferative stimulation in monocytes and anti-inflammatory effect in macrophages — suggests a sophisticated immunomodulatory role for Vilon, consistent with the theory of peptide bioregulators as physiological modulators rather than simple activators or inhibitors.