Interaction of selenium with copper, silver, and gold salts. Electron microprobe study

Area of Science:

• Biochemistry
• Toxicology
• Cell Biology

Background:

• The periodic group 1b elements (copper, silver, gold) have known biological interactions.
• Lysosomes are key organelles involved in cellular waste processing and detoxification.
• Selenium's role in mitigating heavy metal toxicity is an area of ongoing research.

Purpose of the Study:

• To investigate the interaction between selenium and group 1b elements (copper, silver, gold).
• To determine the cellular localization and mechanisms of heavy metal accumulation in the presence of selenium.
• To extend the understanding of selenium's detoxification role to new elements.

Main Methods:

• Electron probe microanalysis was employed to detect elemental distribution within intracellular organelles.
• Administration of copper, silver, and gold salts to study their cellular uptake and localization.
• Observation of organelle-specific concentration and precipitation patterns.

Main Results:

• Copper, silver, and gold salts were found to concentrate in lysosomes, particularly in liver and kidney cells.
• Silver salts also precipitated within glomerular basement membranes.
• Selenium administration enhanced the intralysosomal concentration and precipitation of these heavy metals.
• Co-localization of sulfur and selenium within lysosomes complicated precipitate identification.

Conclusions:

• Selenium facilitates the sequestration of toxic group 1b elements within lysosomes.
• This selenium-mediated lysosomal accumulation serves as a detoxification mechanism, removing harmful elements from circulation.
• The findings extend the known detoxification pathway of selenium to include copper, silver, and gold, similar to its action with arsenic.