Fatty acids do not activate UCP2 in pancreatic beta cells: comparison with UCP1

  • Sandrine Galetti
  • Alexandre Sarre
  • Hélène Perreten
  • Nathalie Produit-Zengaffinen
  • Patrick Muzzin
  • Françoise Assimacopoulos-Jeannet
Signaling and Cell Physiology

Abstract

UCP2 is expressed in pancreatic β cells where its postulated uncoupling activity will modulate glucose-induced changes in ATP/ADP ratio and insulin secretion. The consequences of UCP2 over/underexpression on β-cell function has mainly been studied in the basal state; however, a UCP has no uncoupling activity unless stimulated by fatty acids and/or reactive oxygen species. Here, UCP2 was overexpressed in INS-1 cells and parameters reflecting mitochondrial coupling measured in the basal state and after stimulation by fatty acids. For comparison, UCP1 was expressed to similar levels and the same parameters measured. Neither UCP1 expression nor UCP2 overexpression modified basal or glucose-stimulated metabolic changes. Upon addition of fatty acids, UCP1-expressing cells displayed the expected mitochondrial uncoupling effect, while UCP2 did not elicit any measurable change in mitochondrial function. Taken together, our data demonstrate that, in pancreatic β-cells, UCP2 has no uncoupling activity in the basal state or after fatty acid stimulation.

Keywords

UCP2 UCP1 INS-1 cells Fatty acid-induced uncoupling Mitochondria 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Sandrine Galetti
    • 1
  • Alexandre Sarre
    • 1
  • Hélène Perreten
    • 1
  • Nathalie Produit-Zengaffinen
    • 1
  • Patrick Muzzin
    • 1
  • Françoise Assimacopoulos-Jeannet
    • 1
  1. 1.Department of Cell Physiology and Metabolism, Medical FacultyUniversity of GenevaGeneva 4Switzerland

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