ISSN:
1432-0738
Schlagwort(e):
Key words Mycotoxin
;
Ochratoxin A
;
Genotoxic effects
;
PUBEC
;
SCE frequency
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
Abstract The mycotoxin ochratoxin A (OTA) and its metabolite ochratoxin alpha (OT-alpha) were inves- tigated, to examine their potency to induce sister chromatid exchanges (SCE) in cultured porcine urinary bladder epithelial cells (PUBEC) (primary culture). Serum-free cultured PUBEC were incubated for 5 h with either OTA or OT-alpha, respectively, and subsequently cultured in the presence of 5-bromo-2-de-oxyuridine (BrdU). After two cell cycles, mitosis was inhibited by the colchicine derivative Colcemid, cells were fixed and chromosomes were prepared for SCE analysis. For OTA, a dose-dependent increase in SCE frequency was measured in concentrations between 100 pM and 100 nM OTA. At 100 nM OTA, SCE frequency increased by about 41%, compared to the base SCE level (7.27 SCEs per chromosome set, solvent control). Higher concentrations of OTA were cyto- toxic. The metabolite OT-alpha also increased SCE frequency, but at higher concentrations. At a concentration of 10 μM OT-alpha, an increase of about 55% was detected. OT-alpha showed no cytotoxic effect. These results indicate that OTA is genotoxic in this in vitro system, which represents the urinary bladder epithelium, a target organ of OTA in vivo. It could also be shown that OT-alpha, which is said to be non-toxic, is genotoxic in this assay at higher concentrations.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/s002040050171
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