Guanosine diphosphate exerts a lower effect on superoxide release from mitochondrial matrix in the brains of uncoupling protein-2 knockout mice: new evidence for a putative novel function of uncoupling proteins as superoxide anion transporters

Biochem Biophys Res Commun. 2012 Nov 16;428(2):234-8. doi: 10.1016/j.bbrc.2012.10.025. Epub 2012 Oct 12.


In this report, we show new experimental evidence that, in mouse brain mitochondria, uncoupling protein-2 (UCP2) can be involved in superoxide (O(2)(·-)) removal from the mitochondrial matrix. We found that the effect of guanosine 5'-diphosphate (GDP) on the rate of reactive oxygen species (ROS) release from brain mitochondria of UCP2 knockout mice was less pronounced compared to the wild type animals. This putative novel UCP2 activity, evaluated by the use of UCP2-knockout transgenic animals, along with the known antioxidant defence systems, may provide additional protection from ROS in brain mitochondria.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / drug effects*
  • Brain / metabolism*
  • Guanosine Diphosphate / pharmacology
  • Ion Channels / genetics
  • Ion Channels / physiology*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Mitochondria / drug effects*
  • Mitochondria / metabolism*
  • Mitochondrial Proteins / genetics
  • Mitochondrial Proteins / physiology*
  • Reactive Oxygen Species / metabolism
  • Superoxides / metabolism*
  • Uncoupling Protein 2


  • Ion Channels
  • Mitochondrial Proteins
  • Reactive Oxygen Species
  • Ucp2 protein, mouse
  • Uncoupling Protein 2
  • Superoxides
  • Guanosine Diphosphate