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18F-Fluorodeoxyglucose and PET/CT for noninvasive study of exercise-induced glucose uptake in rat skeletal muscle and tendon

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Abstract

Purpose

To investigate exercise-related glucose uptake in rat muscle and tendon using PET/CT and to study possible explanatory changes in gene expression for the glucose transporters (GLUT1 and GLUT4).

Methods

The sciatic nerve in eight Wistar rats was subjected to electrostimulation to cause unilateral isometric contractions of the calf muscle. 18F-Fluorodeoxyglucose was administered and a PET/CT scan of the hindlimbs was performed. SUVs were calculated in both Achilles tendons and the triceps surae muscles. To exclude a spill-over effect the tendons and muscles from an ex vivo group of eight rats were cut out and scanned separately (distance≥1 cm).

Results

Muscle contractions increased glucose uptake approximately sevenfold in muscles (p<0.001) and 36% in tendons (p<0.01). The ex vivo group confirmed the increase in glucose uptake in intact animals. GLUT1 and GLUT4 were expressed in both skeletal muscle and tendon, but no changes in mRNA levels could be detected.

Conclusion

PET/CT can be used for studying glucose uptake in rat muscle and tendon in relation to muscle contractions; however, the increased uptake of glucose was not explained by changes in gene expression of GLUT1 and GLUT4.

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Acknowledgments

This work was supported by the Danish Medical Research Council, the Novo Nordisk Foundation, the Lundbeck Foundation and the A. P. Møller Foundation.

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Authors and Affiliations

  1. Cluster for Molecular Imaging, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark

    Dorthe Skovgaard, Henrik El-Ali & Andreas Kjaer

  2. Department Clinical Physiology, Nuclear Medicine and PET, Center of Diagnostic Investigations, Rigshospitalet, Copenhagen, Denmark

    Andreas Kjaer

  3. Institute of Sports Medicine, Bispebjerg Hospital, Build. 8, Bispebjerg Bakke 23, DK-2400, Copenhagen, NV, Denmark

    Dorthe Skovgaard & Michael Kjaer

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  1. Dorthe Skovgaard
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Correspondence to Dorthe Skovgaard.

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Skovgaard, D., Kjaer, M., El-Ali, H. et al. 18F-Fluorodeoxyglucose and PET/CT for noninvasive study of exercise-induced glucose uptake in rat skeletal muscle and tendon. Eur J Nucl Med Mol Imaging 36, 859–868 (2009). https://doi.org/10.1007/s00259-008-1020-x

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  • DOI: https://doi.org/10.1007/s00259-008-1020-x

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