Research Paper Volume 1, Issue 4 pp 425—437
Mitochondrial dysfunction and oxidative stress mediate the physiological impairment induced by the disruption of autophagy
- 1 Translational Medicine Branch, National Heart Lung and Blood Institute, NIH, Bethesda, MD 20892, USA
- 2 NHLBI Electron Microscopy Core Facility, National Heart Lung and Blood Institute, NIH, Bethesda, MD 20892, USA
- 3 Laboratory of Frontier Science, Tokyo Metropolitan Institute of Medical Sciences, Tokyo, Japan
received: March 18, 2009 ; accepted: April 8, 2009 ; published: April 9, 2009 ;https://doi.org/10.18632/aging.100038
How to Cite
Impaired or deficient autophagy is believed to cause or contribute to aging, as well as a number of age-related pathologies. The exact mechanism through which alterations in autophagy induce these various pathologies is not well understood. Here we describe the creation of two in vivo mouse models that allow for the characterization of the alteration in mitochondrial function and the contribution of the corresponding oxidative stress following deletion of Atg7. Using these models we demonstrate that isolated mitochondria obtained from Atg7-/- skeletal muscle exhibit a significant defect in mitochondrial respiration. We further show that cells derived from Atg7-/- mice have an altered metabolic profile characterized by decreased resting mitochondrial oxygen consumption and a compensatory increase in basal glycolytic rates. Atg7-/-cells also exhibit evidence for increased steady state levels of reactive oxygen species. The observed mitochondrial dysfunction and oxidative stress is also evident in a mouse model where Atg7 is deleted within the pancreatic β cell. In this model, the simple administration of an antioxidant can significantly ameliorate the physiological impairment in glucose-stimulated insulin secretion. Taken together, these results demonstrate the potential role of mitochondrial dysfunction and oxidative stress in autophagy related pathology.