Abstract
The neuronal ceroid-lipofuscinoses (NCL) are a group of autosomal recessively inherited neurodegenerative disorders characterized by progressive dementia, neuronal atrophy, and premature death. The late infantile and juvenile types of NCL show massive accumulation of mitochondrial ATP synthase subunit c protein in both mitochondria and lysosomes. The specific accumulation of this mitochondrial protein suggests that mitochondrial function may be impaired in the NCL diseases. Therefore, a study was conducted to determine whether oxidative phosphorylation is altered in liver mitochondria from English setters with NCL, an animal model in which there is also massive accumulation of the subunit c protein. The ADP/O ratios were significantly depressed in affected and carrier dogs, suggesting that the disease mutation led to a partial uncoupling of oxidative phosphorylation. On the other hand, ADP-stimulated respiration rates were higher than normal in both carriers and affected dogs. The increased respiration rates were highest in the carriers, and may reflect a compensatory response to the reduced efficiency of oxidative phosphorylation. Accompanying the increased respiration rates were elevations in mitochondrial ADP content with the elevation being greater in the carriers than in the affected dogs. This suggests that the increased respiration rates may be due, at least in part, to enhanced ADP uptake by the mitochondria. In the carriers, the enhanced respiration rate may be sufficient to offset the reduced efficiency of oxidative phosphorylation. In the affected animals, which had lower respiration rates than the carriers, the enhanced respiration rates may not be sufficient to offset the reduced efficiency of oxidative phosphorylation. Impaired mitochondrial function may therefore contribute to the disease pathology.
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Siakotos, A.N., Blair, P.S., Savill, J.D. et al. Altered Mitochondrial Function in Canine Ceroid-Lipofuscinosis. Neurochem Res 23, 983–989 (1998). https://doi.org/10.1023/A:1021036506299
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DOI: https://doi.org/10.1023/A:1021036506299