Behavioral dysfunction, brain oxidative stress, and impaired mitochondrial electron transfer in aging mice
Ana Navarro1, María Jesús Sánchez Del Pino, Carmen Gómez
1Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Cadiz, 11003 Cadiz, Spain. ana.navarro@uca.es
Summary
This study reveals that faster female mice live longest and perform best, while slower males have the shortest lifespan and lowest performance. Aging increases oxidative stress and impairs mitochondrial function, contributing to behavioral decline.
Area of Science:
- Neuroscience
- Gerontology
- Biochemistry
Background:
- Aging is associated with cognitive decline and reduced physical performance.
- Oxidative stress and mitochondrial dysfunction are implicated in the aging process.
Purpose of the Study:
- To investigate the relationship between behavioral performance, lifespan, and age-related changes in oxidative stress and mitochondrial activity in mice.
- To identify molecular mechanisms underlying age-related behavioral deficits.
Main Methods:
- Longitudinal behavioral testing (tightrope, T-maze) in male and female mice over 65 weeks.
- Cross-sectional biochemical analysis of brain oxidative stress markers (TBARS) and mitochondrial enzyme activities (SOD, NADH-cytochrome c reductase, cytochrome oxidase, citrate synthase) in young, adult, and old mice.
Main Results:
- Fast females exhibited the longest lifespan and highest performance; slow males showed the shortest lifespan and lowest performance.
- Increased brain thiobarbituric acid reactive substances (TBARS) and elevated superoxide dismutase (SOD) activities were observed in old mice, males, and slower mice.
- Decreased activities of key mitochondrial enzymes were noted in aged animals.
Conclusions:
- Behavioral performance and lifespan in mice are influenced by sex and intrinsic speed.
- Accumulated oxidative damage and impaired mitochondrial electron transfer contribute to age-related behavioral deficits.
Related Concept Videos
01:37Mitochondria
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
01:46Electron Transport Chain: Complex I and II
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
01:26Aging
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...