Related Experiment Videos
Genotoxic effects of ochratoxin A in human-derived hepatoma (HepG2) cells
1Institute of Cancer Research, University of Vienna, Borschkegasse 8a, A-1090, Vienna, Austria. veronikaehrlich@hotmail.com
Abstract:
Ochratoxin A (OTA) is a widespread mycotoxin that occurs in many commodities from grains to coffee beans all over the world. Evidence is accumulating that OTA may cause cancer in humans. The compound was tested in micronucleus (MN) and single-cell gel electrophoresis (SCGE) assays in human-derived hepatoma (HepG2) cells and caused pronounced dose-dependent effects at exposure concentrations of 5 microg/ml and greater. On the contrary, no induction of His(+) revertants was found in Salmonella microsome assays with strains TA98 and TA100 with HepG2-derived enzyme (S9) mix in liquid incubation assays under identical exposure concentrations. Taken together, our results indicate that OTA is clastogenic in the human-derived cells. These findings support the assumption that this mycotoxin may cause genotoxic effects in hepatic tissue of humans.
Insights
Ochratoxin A (OTA), a common mycotoxin, demonstrated clastogenic effects in human liver cells, indicating potential genotoxic risks in humans. Further research supports its role in hepatic tissue damage.
Area of Science:
- Toxicology
- Genetics
- Food Safety
Background:
- Ochratoxin A (OTA) is a prevalent mycotoxin found globally in various food commodities.
- Accumulating evidence suggests a potential carcinogenic link between OTA exposure and human health.
Purpose of the Study:
- To investigate the genotoxic potential of Ochratoxin A in human-derived cells.
- To assess OTA's clastogenic and mutagenic effects using established in vitro assays.
Main Methods:
- Micronucleus (MN) and single-cell gel electrophoresis (SCGE) assays were performed on human hepatoma (HepG2) cells.
- Salmonella microsome assays (Ames test) with HepG2-derived S9 mix were conducted to evaluate mutagenicity.
Main Results:
- OTA induced significant dose-dependent clastogenic effects in HepG2 cells at concentrations of 5 microg/ml and higher.
- No mutagenic activity (His(+) revertants) was observed in Salmonella strains TA98 and TA100 under identical exposure conditions.
Conclusions:
- Ochratoxin A exhibits clastogenic activity in human-derived liver cells.
- These findings suggest that OTA may pose a genotoxic risk to human hepatic tissues.