Decreased skin-mediated detoxification contributes to oxidative stress and insulin resistance

Area of Science:

• Dermatology
• Metabolic Health
• Toxicology

Background:

• The skin, the largest organ, is crucial for detoxifying xenobiotics and endogenous toxins.
• The specific role of skin detoxification in oxidative stress and insulin resistance remains largely unexplored.
• Burn injuries can significantly impact organ function, including detoxification pathways.

Purpose of the Study:

• To investigate the link between impaired skin detoxification and the development of oxidative stress and insulin resistance.
• To examine how burn-induced damage affects nicotinamide degradation as a marker of skin detoxification capacity.
• To assess the impact of compromised skin detoxification on glucose metabolism and oxidative stress markers.

Main Methods:

• Utilized a rat model with sham-operated and burn groups, with and without nicotinamide coadministration.
• Assessed the expression of detoxification-related enzymes in skin tissue via mRNA analysis.
• Measured plasma levels of nicotinamide, N(1)-methylnicotinamide, glucose, insulin, and hydrogen peroxide (H2O2) following glucose loading.

Main Results:

• Burned skin showed a complete absence of mRNA for tested detoxification enzymes compared to sham-operated skin.
• Burned rats exhibited significantly reduced clearance of nicotinamide and N(1)-methylnicotinamide.
• Following glucose loading, burned rats displayed higher plasma insulin and lower muscle glycogen levels, indicating insulin resistance, with exacerbated effects in the burn-nicotinamide group.

Conclusions:

• Reduced skin detoxification capacity, as observed in burn injuries, is associated with increased oxidative stress and insulin resistance.
• Impaired detoxification pathways in the skin may contribute to metabolic dysregulation and heightened oxidative stress.
• Targeting skin health and detoxification could be a potential strategy for managing metabolic disorders like insulin resistance.