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Molecular and Cellular Biochemistry

, Volume 394, Issue 1–2, pp 13–22 | Cite as

Mitochondrial quality control systems sustain brain mitochondrial bioenergetics in early stages of type 2 diabetes

  • R. X. Santos
  • S. C. Correia
  • M. G. Alves
  • P. F. Oliveira
  • S. Cardoso
  • C. Carvalho
  • R. Seiça
  • M. S. Santos
  • P. I. Moreira
Article

Abstract

Mitochondria have a crucial role in the supply of energy to the brain. Mitochondrial alterations can lead to detrimental consequences on the function of brain cells and are thought to have a pivotal role in the pathogenesis of several neurologic disorders. This study was aimed to evaluate mitochondrial function, fusion–fission and biogenesis and autophagy in brain cortex of 6-month-old Goto–Kakizaki (GK) rats, an animal model of nonobese type 2 diabetes (T2D). No statistically significant alterations were observed in mitochondrial respiratory chain and oxidative phosphorylation system. A significant decrease in the protein levels of OPA1, a protein that facilitates mitochondrial fusion, was observed in brain cortex of GK rats. Furthermore, a significant decrease in the protein levels of LC3-II and a significant increase in protein levels of mTOR phosphorylated at serine residue 2448 were observed in GK rats suggesting a suppression of autophagy in diabetic brain cortex. No significant alterations were observed in the parameters related to mitochondrial biogenesis. Altogether, these results demonstrate that during the early stages of T2D, brain mitochondrial function is maintained in part due to a delicate balance between mitochondrial fusion–fission and biogenesis and autophagy. However, future studies are warranted to evaluate the role of mitochondrial quality control pathways in late stages of T2D.

Keywords

Autophagy Brain cortex Type 2 diabetes Mitochondrial fusion–fission Mitochondrial biogenesis Quality control 

Notes

Acknowledgments

Renato X. Santos has a PhD fellowship from the Fundação para a Ciência e a Tecnologia (SFRH/BD/43972/2008).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • R. X. Santos
    • 1
    • 2
  • S. C. Correia
    • 2
    • 3
  • M. G. Alves
    • 4
  • P. F. Oliveira
    • 4
  • S. Cardoso
    • 1
    • 2
  • C. Carvalho
    • 1
    • 2
  • R. Seiça
    • 5
    • 6
  • M. S. Santos
    • 1
    • 2
  • P. I. Moreira
    • 2
    • 6
  1. 1.Department of Life Sciences – Faculty of Sciences and TechnologyUniversity of CoimbraCoimbraPortugal
  2. 2.CNC - Center for Neuroscience and Cell BiologyUniversity of CoimbraCoimbraPortugal
  3. 3.Institute for Interdisciplinary ResearchUniversity of CoimbraCoimbraPortugal
  4. 4.CICS – UBI – Health Sciences Research CentreUniversity of Beira InteriorCovilhãPortugal
  5. 5.Faculty of Medicine, IBILI - Institute for Biomedical Imaging and Life SciencesUniversity of CoimbraCoimbraPortugal
  6. 6.Laboratory of Physiology – Faculty of MedicineUniversity of CoimbraCoimbraPortugal

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