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Silver affects viability and structure of cultured mouse peritoneal macrophages and peroxidative capacity of whole
Abstract:
The effects of silver on cultured mouse peritoneal macrophages were examined by estimation of cell survival and by light and electron microscopy. Addition of silver lactate to the culture medium at final concentrations of 40 and 80 microM resulted in coagulation necrosis and rapid cell death. At lower concentrations cell structure appeared normal. However, the rate of cell death at 20 microM silver lactate was increased as compared to controls. Silver, visualized by physical development/autometallography, was invariably located in lysosomes. The production of malondialdehyde in mouse liver of silver-treated mice as compared to controls was also examined. This lipid peroxidation product had increased to the same amount in animals treated with silver for either 3 days or with only one silver injection 4 h before examination. This study has demonstrated that silver affects viability and structure of cultured macrophages, possibly due to induction of lipid peroxidation, as demonstrated to occur in the liver of silver-exposed mice.
Insights
Silver lactate exposure causes rapid cell death in mouse macrophages, potentially by inducing lipid peroxidation. This effect was observed in both cultured cells and in the livers of silver-treated mice.
Area of Science:
- Toxicology
- Cell Biology
- Biochemistry
Background:
- Macrophages are crucial immune cells involved in host defense.
- Silver compounds have diverse applications but their toxicological effects require thorough investigation.
Purpose of the Study:
- To investigate the toxic effects of silver lactate on cultured mouse peritoneal macrophages.
- To explore the potential mechanism of silver-induced cytotoxicity, specifically lipid peroxidation.
Main Methods:
- Cultured mouse peritoneal macrophages were exposed to varying concentrations of silver lactate.
- Cell viability was assessed, and cell structures were examined using light and electron microscopy.
- Lipid peroxidation was measured in the livers of silver-treated mice by quantifying malondialdehyde levels.
Main Results:
- Silver lactate at 40 and 80 microM caused coagulation necrosis and rapid cell death.
- Even at 20 microM, silver lactate increased the rate of cell death compared to controls.
- Silver particles were localized within lysosomes of treated macrophages.
- Malondialdehyde levels, a marker of lipid peroxidation, were elevated in the livers of silver-exposed mice.
Conclusions:
- Silver lactate significantly impacts macrophage viability and cellular structure.
- The observed toxicity may be mediated by the induction of lipid peroxidation.
- Silver accumulation in lysosomes could play a role in its cytotoxic effects.