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Reduced exercise endurance in interleukin-6-deficient mice
Jenny Fäldt1, Ingrid Wernstedt, Sharyn M Fitzgerald
1Research Center for Endocrinology and Metabolism, Sahlgrenska University Hospital, Grona Straket 8, SE-413 45 Gothenburg, Sweden. jenny.faldt@medic.gu.se
Endocrinology
|February 28, 2004
Summary
Mice lacking interleukin-6 (IL-6) showed reduced exercise endurance and energy expenditure. This suggests that IL-6 is essential for maintaining normal physical activity and metabolic function during exercise.
Area of Science:
- Exercise Physiology
- Metabolic Regulation
- Immunology
Background:
- Interleukin-6 (IL-6) is released by skeletal muscle during prolonged exercise.
- IL-6 influences energy expenditure and body fat mass.
- The biological significance of IL-6 during exercise remains incompletely understood.
Purpose of the Study:
- To investigate the role of IL-6 in exercise endurance and energy expenditure.
- To examine the effects of IL-6 deficiency in preobese and obese mouse models.
Main Methods:
- Utilized IL-6-deficient (IL-6(-/-)) mice and littermate controls.
- Assessed exercise endurance and energy expenditure via treadmill tests and indirect calorimetry (oxygen consumption).
- Compared preobese (4-month-old) and obese (7-month-old) mice.
Main Results:
- IL-6(-/-) mice exhibited reduced endurance and decreased oxygen consumption during exercise.
- Preobese IL-6(-/-) mice were leaner, while older IL-6(-/-) mice showed obesity.
- Resting young IL-6(-/-) mice had altered respiratory exchange ratio (RER), indicating carbohydrate utilization.
Conclusions:
- IL-6 deficiency impairs exercise capacity in mice.
- IL-6 plays a crucial role in regulating energy expenditure and endurance during physical activity.
- These findings highlight IL-6's necessity for normal exercise performance.