Moderate intensity exercise may protect cardiac function by influencing spleen microbiome composition

Area of Science:

• Microbiology
• Immunology
• Cardiology

Background:

• Physical exercise benefits cardiorespiratory fitness, potentially via reduced inflammation, but mechanisms are debated.
• Spleen microbiomes are increasingly recognized for their role in immune regulation.
• The interplay between exercise, spleen microbiota, and cardiac function requires further investigation.

Purpose of the Study:

• To investigate the relationship between exercise intensity, spleen microbiome composition, and cardiac function.
• To explore the potential role of specific bacteria, like Lactobacillus johnsonii, in mediating exercise effects.

Main Methods:

• Utilized a high-fat diet and exercise mouse model.
• Analyzed spleen microbiome composition across different exercise intensities.
• Assessed Treg cell levels and cardiac function in the mice.

Main Results:

• Exercise intensity influenced spleen microbiome composition, Treg cell levels, and cardiac function.
• A positive correlation was observed between Lactobacillus johnsonii abundance and Treg cell levels.
• Moderate-intensity exercise showed potential for cardiac function protection.

Conclusions:

• Moderate-intensity exercise may protect cardiac function by modulating the spleen microbiome.
• Lactobacillus johnsonii may play a role in Treg cell production, linking exercise to immune and cardiac benefits.