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Exercise and GLUT4 in human subcutaneous adipose tissue
Marcelo Flores-Opazo1,2, Eva Boland1, Andrew Garnham3
1Department of Physiology, The University of Melbourne, Melbourne, Australia.
Physiological Reports
|November 20, 2018
Summary
Exercise does not increase adipose tissue GLUT4 (glucose transporter type 4) expression after a single bout or 10 days of training. Skeletal muscle GLUT4 expression significantly increased following training, highlighting differential tissue responses to exercise.
Area of Science:
- Exercise Physiology
- Metabolic Regulation
- Molecular Biology
Background:
- Glucose transporter type 4 (GLUT4) is crucial for insulin-stimulated glucose uptake in adipose and muscle tissues.
- Exercise is known to influence glucose metabolism, but its effects on adipose tissue GLUT4 expression are not fully understood.
- Understanding tissue-specific responses of GLUT4 to exercise is vital for metabolic health research.
Purpose of the Study:
- To investigate the impact of acute and chronic exercise on GLUT4 expression in human adipose tissue.
- To compare the effects of exercise on adipose tissue GLUT4 versus skeletal muscle GLUT4.
- To determine if exercise training alters GLUT4 mRNA and protein levels in abdominal adipose tissue.
Main Methods:
- Healthy male subjects underwent either a single 60-min cycle ergometer exercise bout or 10 days of structured exercise training.
- Abdominal adipose tissue and vastus lateralis muscle biopsies were collected before and after exercise/training interventions.
- GLUT4 and COX-IV (cytochrome c oxidase subunit IV) expression levels were analyzed using molecular techniques.
Main Results:
- A single exercise bout did not alter adipose tissue GLUT4 mRNA but slightly reduced protein levels post-exercise.
- Ten days of exercise training did not change adipose tissue GLUT4 or COX-IV expression.
- In contrast, skeletal muscle GLUT4 and COX-IV expression increased significantly (47% and 44%, respectively) after training.
Conclusions:
- Neither acute exercise nor 10 days of training enhances adipose tissue GLUT4 expression in healthy males.
- Exercise training significantly upregulates GLUT4 and COX-IV in skeletal muscle, indicating a tissue-specific adaptive response.
- These findings suggest that adipose tissue may have a limited capacity to increase GLUT4 expression in response to short-term exercise interventions.
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