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Updated: Jul 15, 2026
Isolation and Functional Analysis of Mitochondria from Cultured Cells and Mouse Tissue
Published on: March 23, 2015
Using MT(-/-) mice to study metallothionein and oxidative stress
C C Conrad1, D T Grabowski, C A Walter
1Department of Molecular Biology and Immunology, The University of North Texas Health Science Center at Fort Worth, Fort Worth, TX, USA.
Metallothionein (MT) does not protect against oxidative stress in mice. MT-null mice showed similar damage and survival rates as wild-type mice, indicating MT is not essential for cellular protection in vivo.
Area of Science:
- Biochemistry
- Toxicology
- Genetics
Background:
- Metallothioneins (MTs) are proteins known for their role in metal binding and detoxification.
- Their potential role in protecting against oxidative stress in vivo is not fully understood.
Purpose of the Study:
- To investigate the protective role of metallothionein (MT) against oxidative stress in vivo.
- To determine if MT-1 and MT-2 gene null mutations affect cellular damage and survival following exposure to oxidative stressors.
Main Methods:
- Utilized wild-type (MT(+/+)) and MT-null (MT(-/-)) mice.
- Administered saline or zinc pretreatment.
- Exposed mice to gamma-irradiation or 2-nitropropane to induce oxidative stress.
- Assessed antioxidant defense systems, oxidative damage markers (DNA, lipids, proteins), and survival rates.
Main Results:
- MT-null mice showed no compensatory changes in other antioxidant systems.
- Oxidative damage levels were similar in MT(-/-) and MT(+/+) mice.
- MT(-/-) and MT(+/+) mice exhibited similar survival rates after irradiation, but zinc pretreatment improved survival in both groups.
Conclusions:
- Tissue metallothionein levels do not confer protection against oxidative stress in vivo.
- Zinc pretreatment enhances survival independently of metallothionein levels.
- MT-1 and MT-2 are not essential for protecting against the tested oxidative stressors.
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