Original Research

Cellular and Molecular Neurobiology

, 29:1063

First online:

Amyloid-beta Leads to Impaired Cellular Respiration, Energy Production and Mitochondrial Electron Chain Complex Activities in Human Neuroblastoma Cells

  • V. RheinAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel
  • , G. BaysangAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel
  • , S. RaoAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel
  • , F. MeierAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel
  • , A. BonertAffiliated withDepartment of Pharmacology, Biocenter, J.W. Goethe University of Frankfurt
  • , F. Müller-SpahnAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel
  • , A. EckertAffiliated withAssociation Research Group Department of Biomedicine, Neurobiology Laboratory for Brain Aging and Mental Health, Psychiatric University Clinics, University of Basel Email author 

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Abstract

Evidence suggests that amyloid-beta (Aβ) protein is a key factor in the pathogenesis of Alzheimer’s disease (AD) and it has been recently proposed that mitochondria are involved in the biochemical pathway by which Aβ can lead to neuronal dysfunction. Here we investigated the specific effects of Aβ on mitochondrial function under physiological conditions. Mitochondrial respiratory functions and energy metabolism were analyzed in control and in human wild-type amyloid precursor protein (APP) stably transfected human neuroblastoma cells (SH-SY5Y). Mitochondrial respiratory capacity of mitochondrial electron transport chain (ETC) in vital cells was measured with a high-resolution respirometry system (Oxygraph-2k). In addition, we determined the individual activities of mitochondrial complexes I–IV that compose ETC and ATP cellular levels. While the activities of complexes I and II did not change between cell types, complex IV activity was significantly reduced in APP cells. In contrast, activity of complex III was significantly enhanced in APP cells, as compensatory response in order to balance the defect of complex IV. However, this compensatory mechanism could not prevent the strong impairment of total respiration in vital APP cells. As a result, the respiratory control ratio (state3/state4) together with ATP production decreased in the APP cells in comparison with the control cells. Chronic exposure to soluble Aβ protein may result in an impairment of energy homeostasis due to a decreased respiratory capacity of mitochondrial electron transport chain which, in turn, may accelerate neurons demise.

Keywords

Mitochondria Amyloid-beta SH-SY5Y cells Respiration Electron chain Energy ATP Oxygen consumption