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Measurement of Mitochondrial Oxygen Consumption in Permeabilized Fibers of Drosophila Using Minimal Amounts of Tissue
Published on: April 7, 2018
Age-related decrease in expression of mitochondrial DNA encoded subunits of cytochrome c oxidase in Drosophila
Rajindar S Sohal1, Dikran Toroser, Catherine Brégère
1Department of Pharmacology and Pharmaceutical Sciences, University of Southern California, 1985 Zonal Avenue, Los Angeles, CA 90033, United States. sohal@usc.edu
Mechanisms of Ageing and Development
|June 10, 2008
Summary
Aging reduces mitochondrial function, increasing oxidative stress. This study found age-related declines in cytochrome c oxidase (CcO) subunits II and III in fruit flies, explaining decreased respiratory capacity and higher oxidant production.
Area of Science:
- * Aging research
- * Mitochondrial biology
- * Molecular genetics
Background:
- * Aging is characterized by declining mitochondrial respiratory capacity and increased reactive oxygen species (ROS).
- * Cytochrome c oxidase (CcO), crucial for mitochondrial respiration, shows age-related activity decline in Drosophila melanogaster.
- * The precise molecular mechanisms behind CcO activity loss during aging remain unclear.
Purpose of the Study:
- * To investigate if reduced abundance of mitochondrial DNA-encoded catalytic subunits of CcO contributes to age-associated enzyme activity loss.
- * To quantify age-dependent changes in the protein levels of CcO subunits I, II, and III.
Main Methods:
- * Immunoblot analysis was used to determine the protein amounts of CcO subunits I, II, and III.
- * Protein levels were measured in Drosophila melanogaster at various ages (15, 25, 35, 47, and 60 days).
Main Results:
- * Significant age-related decreases in CcO subunits II (up to 43%) and III (up to 75%) were observed.
- * CcO subunit I showed a less pronounced age-related decrease (15%).
- * These findings suggest altered CcO holoprotein stoichiometry during aging.
Conclusions:
- * Decreased abundance of CcO subunits II and III is a key factor in age-related decline of mitochondrial respiratory activity.
- * This decline in CcO function contributes to increased oxidant production during aging.
- * The study highlights dynamic alterations in CcO stoichiometry as a mechanism in Drosophila melanogaster aging.
