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Use of a Caspase Multiplexing Assay to Determine Apoptosis in a Hypothalamic Cell Model
Published on: April 16, 2014
A rapid screening method to test apoptotic synergisms of ochratoxin A with other nephrotoxic substances
Florian Weber1, Ruth Freudinger, Gerald Schwerdt
1Physiologisches Institut, Universität Würzburg, Röntgenring 9, D-97070 Würzburg, Germany.
Abstract:
The body may be exposed simultaneously to more than one nephrotoxic substance and to measure the effects of the great number of possible combinations of nephrotoxins will rapidly become a great challenge when using the traditional methods. Therefore, we developed a rapid and cost-efficient method to screen the apoptotic potential of combinations of known cell- or nephrotoxic substances as ochratoxin A (OTA), cisplatin, cadmium, H(2)O(2), and amphotericin B on renal epithelial cell lines. The cells were seeded in 96-well plates and the apoptotic and necrotic potential of different combinations of nephrotoxins was determined. We found different results for the combinations used: depending on the concentrations of the various substances, antagonistic, additive, or potentiating effects on caspase-3 activity were found after co-exposure to OTA. We conclude that the co-exposure of renal cells to OTA with other substances can enhance or reduce the apoptotic potential of one substance alone depending on the substance, the concentration and on the cell line investigated. A "harmless" substance can thus convert to a potent cell toxic substance when combined with OTA or vice versa. The underlying mechanisms of the synergistic effects remain unknown.
Insights
Combinations of nephrotoxins, like ochratoxin A (OTA), can alter their toxicity to kidney cells. A new method screens these effects, revealing synergistic or antagonistic impacts on cell apoptosis.
Area of Science:
- Toxicology
- Cell Biology
- Renal Science
Background:
- Simultaneous exposure to multiple nephrotoxins presents a challenge for traditional toxicity testing.
- Understanding combined nephrotoxin effects is crucial for risk assessment.
Purpose of the Study:
- To develop a rapid, cost-efficient method for screening the combined apoptotic potential of nephrotoxins.
- To investigate the effects of ochratoxin A (OTA) in combination with other nephrotoxic substances on renal cells.
Main Methods:
- Utilized a 96-well plate assay to screen the apoptotic and necrotic potential of nephrotoxin combinations.
- Co-exposed renal epithelial cell lines to various combinations of OTA, cisplatin, cadmium, H(2)O(2), and amphotericin B.
Main Results:
- Observed antagonistic, additive, and potentiating effects on caspase-3 activity depending on substance concentrations.
- Co-exposure to OTA modified the apoptotic potential of other substances, with effects varying by substance, concentration, and cell line.
Conclusions:
- Combined exposure to nephrotoxins can alter individual toxicities, potentially converting harmless substances into potent toxins or vice versa.
- The mechanisms underlying these synergistic or antagonistic effects in renal cells require further investigation.
