Moderate exercise-induced dynamics on key sepsis-associated signaling pathways in the liver

Area of Science:

• Physiology
• Immunology
• Sepsis Research

Background:

• Fitness levels correlate with surgical outcomes, but whether fitness is modifiable and its biological basis remain unclear.
• The liver's central role in immune defense during systemic infection makes it a key organ for studying sepsis.
• The cecal ligation and puncture (CLP) model in rats simulates human polymicrobial sepsis originating from the gut.

Purpose of the Study:

• To investigate the impact of moderate exercise training on survival rates in a rat model of sepsis.
• To elucidate the underlying hepatic biological responses to exercise and sepsis.

Main Methods:

• Rats underwent 3 weeks of treadmill exercise training before undergoing CLP to induce sepsis.
• Survival was monitored for five days post-CLP.
• Hepatic tissue and serum were analyzed for molecular pathways related to exercise and sepsis survival.

Main Results:

• Exercise training significantly increased survival rates following CLP.
• Exercise attenuated sepsis-induced increases in inflammatory markers (TNF-a, IL-6).
• Exercise restored sepsis-suppressed SOD and Nrf2 expression and reduced oxidative/nitrosative stress.

Conclusions:

• Moderate exercise training enhances survival in polymicrobial sepsis (CLP) in rats.
• Exercise confers protection through reduced inflammation, oxidative stress, and activation of antioxidant pathways.
• Exercise is a potential modifiable factor influencing sepsis outcomes.