Metal interactions in mice under environmental stress

Area of Science:

• Environmental Chemistry
• Toxicology
• Biochemistry

Background:

• Toxic metals (Cd, Hg, As) pose significant health risks.
• Understanding metal-biomolecule interactions is crucial for toxicology.
• Metallomics and metabolomics offer advanced analytical tools for biological studies.

Purpose of the Study:

• To investigate the biological effects of toxic metal exposure (Cd, Hg, As) in mice using a metallomic approach.
• To evaluate metal-protein interactions and organ-specific accumulation.
• To assess environmental contamination impacts on wild mice and integrate metallomic and metabolomic data for comprehensive biological response evaluation.

Main Methods:

• Size exclusion chromatography coupled with ICP-MS for metallomic analysis.
• Direct infusion mass spectrometry for metabolomic profiling of organ extracts.
• Exposure experiments with laboratory mice (Mus musculus) and analysis of wild mice (Mus spretus) from contaminated sites.

Main Results:

• Cadmium exposure induced Cd-metallothionein in the liver.
• Mercury exposure affected Cu-superoxide dismutase (Cu-SOD) and led to Hg translocation to the kidney.
• Selenium showed a protective effect against mercury toxicity; arsenic exposure resulted in the accumulation of methylated metabolites for excretion.
• Metallomic analysis of wild mice revealed altered metal-protein profiles in contaminated areas, consistent with exposure experiments.
• Metabolomic analysis identified significant metabolic changes related to oxidative stress, cell damage, and arsenic elimination.

Conclusions:

• Metallomics and metabolomics provide a comprehensive understanding of toxic metal biological responses.
• These integrated approaches are valuable for both controlled exposure studies and environmental risk assessment.
• The study highlights the protective roles of organs and biomolecules, as well as the mechanisms of metal detoxification and excretion.