Alpha-melanocyte-stimulating hormone acts as a selective inhibitor of NF-kB signaling and reduces experimental colitis

Summary

This study investigated the anti-inflammatory mechanism of alpha-MSH and its C-terminal tripeptide KPV (Lys-Pro-Val) in murine models of experimental colitis. KPV demonstrated significant anti-inflammatory effects through selective inhibition of NF-kB nuclear translocation in intestinal epithelial cells and lamina propria macrophages, reducing disease severity in both DSS-induced and TNBS-induced colitis models.

Key Findings

• KPV significantly reduced clinical and histological scores of colitis in both DSS-induced and TNBS-induced murine colitis models
• The anti-inflammatory mechanism was identified as direct inhibition of NF-kB nuclear translocation, mediated by stabilization of IkB-alpha
• KPV retained the anti-inflammatory potency of full-length alpha-MSH, indicating the C-terminal tripeptide is the active pharmacophore for NF-kB inhibition in intestinal inflammation