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Related Experiment Video

Updated: Aug 8, 2025

Visualization of Mitochondrial Respiratory Function using Cytochrome C Oxidase / Succinate Dehydrogenase COX/SDH Double-labeling Histochemistry

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Published on: November 23, 2011

Defective COX1 expression in aging mice liver.

Steffen Witte¹, Angela Boshnakovska¹, Metin Özdemir¹

¹Department of Cellular Biochemistry, University Medical Center, Göttingen, 37073, Germany.

|March 2, 2023

Summary

Aging alters liver mitochondrial gene expression, with decreased Cox1 transcript correlating to reduced respiratory complex IV activity in older mice. This suggests mitochondrial defects contribute to age-related liver changes.

Keywords:

Ageing Mitochondria Nanopore Transcriptomics

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Last Updated: Aug 8, 2025

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Area of Science:

Gerontology
Mitochondrial Biology
Hepatology

Background:

Mitochondrial defects link to aging and diseases like cancer and neurodegeneration.
Mild mitochondrial dysfunction may correlate with extended lifespans.
Liver aging shows dysregulated mitochondrial function and nutrient sensing pathways.

Purpose of the Study:

To investigate the impact of aging on mitochondrial gene expression in mouse liver.
To determine if mitochondrial gene expression defects correlate with age-related metabolic decline.

Main Methods:

Utilized wildtype C57BL/6N mice to study liver aging.
Analyzed alterations in mitochondrial energy metabolism with age.
Employed Nanopore sequencing for mitochondrial transcriptomics.

Main Results:

Observed age-related alterations in mitochondrial energy metabolism in liver tissue.
Identified a decrease in the Cox1 transcript in older mice livers.
Found a correlation between reduced Cox1 transcript levels and diminished respiratory complex IV activity.

Conclusions:

Aging significantly impacts mitochondrial gene expression in the liver.
Decreased Cox1 transcript is a molecular marker for age-related decline in respiratory complex IV activity.
Mitochondrial gene expression defects are linked to age-associated changes in liver energy metabolism.