Vitamins C and E protect hepatic cytochrome P450 dysfunction induced by polymicrobial sepsis

Area of Science:

• Biochemistry
• Pharmacology
• Toxicology

Background:

• Polymicrobial sepsis leads to significant organ dysfunction, including impaired hepatic drug metabolism.
• Cytochrome P450 (CYP) enzymes are crucial for drug detoxification and their activity is often compromised during sepsis.
• Oxidative stress and lipid peroxidation are key contributors to sepsis-induced cellular damage.

Purpose of the Study:

• To investigate the protective effects of vitamins C and E on hepatic microsomal cytochrome P450 (CYP) activity and gene expression during polymicrobial sepsis.
• To determine the role of oxidative stress and lipid peroxidation in sepsis-related CYP dysfunction.

Main Methods:

• Cecal ligation and puncture (CLP) model in animals to induce polymicrobial sepsis.
• Administration of vitamins C and E to assess their impact on liver function markers.
• Measurement of serum aminotransferase, lipid peroxidation, and hepatic reduced glutathione levels.
• Assay of CYP1A1, CYP1A2, and CYP2E1 activities and mRNA expression in liver microsomes.

Main Results:

• CLP induced significant increases in serum aminotransferase and lipid peroxidation, which were attenuated by vitamins C and E.
• Hepatic reduced glutathione levels decreased in septic animals but were preserved by vitamin C.
• Both the activity and mRNA expression of CYP1A1 and CYP2E1, as well as the activity of CYP1A2, were reduced by CLP but restored by vitamins C and E.
• Vitamins C and E administration inhibited the decrease in hepatic CYP activity and expression.

Conclusions:

• Vitamins C and E effectively protect against hepatic drug metabolizing dysfunction during sepsis.
• The protective mechanism involves the reduction of oxidative stress and lipid peroxidation.
• These findings highlight the therapeutic potential of antioxidants in managing sepsis-induced liver injury and metabolic derangements.