Effects of the naturally occurring food mycotoxin ochratoxin A on brain cells in culture.

Détails

ID Serval
serval:BIB_075F1E456981
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Effects of the naturally occurring food mycotoxin ochratoxin A on brain cells in culture.
Périodique
Neurotoxicology
Auteur⸱e⸱s
Monnet-Tschudi F., Sorg O., Honegger P., Zurich M.G., Huggett A.C., Schilter B.
ISSN
0161-813X[print], 0161-813X[linking]
Statut éditorial
Publié
Date de publication
1997
Volume
18
Numéro
3
Pages
831-839
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
The potential of ochratoxin A (OTA) to damage brain cells was studied by using a three-dimensional cell culture system as model for the developing brain. Aggregating cell cultures of foetal rat telencephalon were tested either during an early developmental period, or during a phase of advanced maturation, over a wide range of OTA concentrations (0.4 nM to 50 microM). By monitoring changes in activities of cell type-specific enzymes (ChAt and GAD, for cholinergic and GABAergic neurones, respectively, GS for astrocytes and CNP for oligodendrocytes), the concentration-dependent toxicity and neurodevelopmental effects of OTA were determined. OTA proved to be highly toxic, since a 10-day treatment at 50 nM caused a general cytotoxicity in both mature and immature cultures. At 10 nM of OTA, cell type-specific effects were observed: in immature cultures, a loss in neuronal and oligodendroglial enzyme activities, and an increase in the activity of the astroglial marker glutamine synthetase were found, Furthermore, at 2 and 10 nM of OTA, a clustering of microglial cells was observed. In mature cultures, OTA was somewhat less potent, but caused a similar pattern of toxic effects. A 24 h-treatment with OTA resulted in a concentration-dependent decrease in protein synthesis, with IC50 values of 25 nM and 33 nM for immature and mature cultures respectively. Acute (24 h) treatment at high OTA concentrations (10 to 50 microM) caused a significant increase in reactive oxygen species formation, as measured by the intracellular oxidation of 2',7'-dichlorofluorescin. These results suggest that OTA has the potential to be a potent toxicant to brain cells, and that its effects at nanomolar concentrations are primarily due to the inhibition of protein synthesis, whereas ROS seem not to be involved in the toxicity mediated by a chronic exposure to OTA at such low concentrations.
Mots-clé
Animals, Brain/drug effects, Cells, Cultured, Dose-Response Relationship, Drug, Food/toxicity, Immunohistochemistry, Mycotoxins/toxicity, Ochratoxins/toxicity, Rats
Pubmed
Web of science
Création de la notice
24/01/2008 13:12
Dernière modification de la notice
20/08/2019 12:29
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