Thioredoxin is associated with endotoxin tolerance in mice

Area of Science:

• Biochemistry and Molecular Biology
• Immunology
• Toxicology

Background:

• Oxidative stress and lipid peroxidation are implicated in the lethal effects of lipopolysaccharide (LPS).
• Endotoxin tolerance is a state of reduced responsiveness to LPS, crucial in managing sepsis.
• Thioredoxin is an antioxidant protein with potential protective roles against cellular damage.

Purpose of the Study:

• To investigate the role of thioredoxin induction in the development of endotoxin tolerance.
• To determine if enhanced thioredoxin levels reduce mortality in LPS-treated mice.

Main Methods:

• A prospective, randomized, controlled study was conducted in adult male ddy mice.
• Mice were pre-treated with a low dose of LPS or saline before a high-dose LPS challenge.
• Thioredoxin expression and 4-hydroxy-2-nonenal (4-HNE) modified proteins were measured post-LPS challenge.

Main Results:

• Pre-treatment with low-dose LPS significantly increased 72-hour survival rates from 30% to 82% (p = .025).
• Thioredoxin concentrations in the lung, heart, and liver were 1.5- to 2-fold higher in pre-treated mice.
• Accumulation of 4-HNE modified proteins was lower in pre-treated mice after high-dose LPS challenge.

Conclusions:

• Increased thioredoxin concentration, induced by low-dose LPS pre-treatment, enhances survival against high-dose LPS.
• Thioredoxin is associated with the development of endotoxin tolerance in a murine model.
• Targeting thioredoxin may offer a therapeutic strategy for sepsis and endotoxemia.