Fibroblast growth factor 21 promotes glucose uptake by a GLUT4-dependent and Akt-independent mechanism in isolated fibers of skeletal muscle

Authors

  • Giovanni Rosales-Soto Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.
  • Alexis Díaz-Vegas Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.
  • Paola Llanos Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.
  • Mariana Casas Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.
  • Enrique Jaimovich Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.
  • Ariel Contreras-Ferrat Center for Exercise, Metabolism and Cancer, Facultad de Medicina, Universidad de Chile, Santiago, Chile. 2Institute for Research in Dental Science, Facultad de Odontología, Universidad de Chile, Santiago, Chile. 3Institute of Biomedical Sciences Facultad de Medicina, Universidad de Chile, Santiago, Chile.

Keywords:

Fibroblast growth factor 21, glucose uptake, GLUT4-dependent and Akt-independent mechanism, isolated fibers, skeletal muscle

Abstract

Introduction: Fibroblast growth factor 21 (FGF21) is a pleiotropic peptide hormone that induces glucose uptake in both primary myotubes and C2C12 myoblasts. However, the cellular mechanism involved and its role in adult skeletal muscle fibers is poorly understood.

Material and Methods: Male mice were used at 6-8 weeks of age. The glucose uptake was evaluated in single living fibers from flexor digitorum brevis muscle. To determine glucose uptake, we used the phosphorylable, non-metabolizable fluorescent glucose analog 2-NBDG (300 µM) that has been used to monitor glucose uptake in single living cells.

Results: FGF21 induces a dose-response effect, increasing glucose uptake in isolated skeletal muscle fibers. This effect is prevented by the use of either Cytochalasin B (5 µM) or Indinavir (100 µM), both antagonists of GLUT4 activity. The use of PI3K inhibitors such as Wortmannin (100 nM) and LY294002 (50 µM) prevents the FGF21-dependent glucose uptake. In fibers electroporated with the construct encoding GLUT4myc-eGFP chimera and stimulated with FGF21 (100 ng/mL) for 20 min, a strong sarcolemmal GLUT4 presence was detected. This effect, promoted by FGF21, is independent of Akt phosphorylation and is partially prevented by the inhibition of PKCs.

Conclusions: These results suggest that FGF21 regulates glucose uptake by a mechanism dependent on PI3K activity and independent of Akt phosphorylation.

Keywords: Fibroblast growth factor 21, glucose uptake, GLUT4-dependent and Akt-independent mechanism, isolated fibers, skeletal muscle

 

Financed by FONDECYT (1151293, 11130267, and 11150243)

Downloads

Download data is not yet available.

Published

2020-01-28

How to Cite

1.
Rosales-Soto G, Díaz-Vegas A, Llanos P, Casas M, Jaimovich E, Contreras-Ferrat A. Fibroblast growth factor 21 promotes glucose uptake by a GLUT4-dependent and Akt-independent mechanism in isolated fibers of skeletal muscle. Rev Cubana Inv Bioméd [Internet]. 2020 Jan. 28 [cited 2025 Aug. 31];38(5). Available from: https://revibiomedica.sld.cu/index.php/ibi/article/view/457