Exercise training improves leptin sensitivity in peripheral tissue of obese rats

Area of Science:

• Metabolic research
• Obesity studies
• Exercise physiology

Background:

• High-fat diets induce obesity and leptin resistance.
• Leptin signaling is crucial for regulating body weight and metabolism.
• Understanding interventions to restore leptin sensitivity is vital.

Purpose of the Study:

• To investigate the effects of exercise training and dietary control on leptin sensitivity in high-fat diet-induced obese rats.
• To analyze changes in leptin receptor (ObRb) and SOCS3 mRNA levels in response to interventions.
• To compare the efficacy of combined exercise and diet versus diet alone.

Main Methods:

• Male Sprague-Dawley rats were fed a high-fat diet to induce obesity.
• Interventions included exercise training, normal diet change, and combined approaches.
• Leptin protein levels and mRNA expression of ObRb and SOCS3 were measured in hypothalamus, liver, and muscle.

Main Results:

• High-fat diet significantly increased body weight.
• Plasma leptin levels decreased in intervention groups (exercise, diet change, combined) compared to the high-fat group.
• ObRb and SOCS3 mRNA expression in liver and muscle increased with interventions, while hypothalamic expression decreased.
• Combined exercise and diet showed significant improvements compared to diet alone.

Conclusions:

• Combined exercise and dietary control are more effective in improving peripheral leptin sensitivity than dietary control alone.
• Interventions modulate ObRb and SOCS3 mRNA expression in key metabolic tissues.
• These findings highlight the synergistic benefits of exercise and diet in combating diet-induced obesity and leptin resistance.