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The emerging Fusarium toxin enniatin B: in-vitro studies on its genotoxic potential and cytotoxicity in V79 cells in relation to other mycotoxins

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Abstract

The Fusarium metabolite enniatin B is now recognized as a frequent contaminant of grains used for human foods and animal feeds. Yet, so far very limited data are available on its toxicity and that of other emerging Fusarium mycotoxins (Jestoi M, 2008, Crit Rev Food Sci Nutr 48:21-49). Thus, the mutagenic/genotoxic potential of enniatin B was investigated in a battery of short-term tests, and its cytotoxicity compared with that of several other mycotoxins. No mutagenicity was detected in the Ames assay with four Salmonella typhimurium strains, and in the HPRT (hypoxanthine guanine phosphoribosyl transferase) assay with V79 cells, in either the presence or absence of an external metabolizing enzyme system (rat liver S9). For other types of genotoxicity, i.e., clastogenicity and chromosomal damage, studied in V79 cells by means of alkaline single-cell gel electrophoresis (Comet) assay and micronucleus assay, no significant genotoxic potential of enniatin B was revealed. However, the Fusarium metabolite exerts pronounced time- and concentration-dependent cytotoxic effects in V79 cells as determined by Alamar Blue reduction and by neutral red uptake assays. For instance, IC20 and IC50 values determined for enniatin B by neutral red assay for 48-h exposure are 1.5 μM and 4 μM. These values are higher than those of the more potent Fusarium toxin deoxynivalenol (IC20 0.7 μM, IC50 of 0.8 μM), but clearly lower than the IC values of several other mycotoxins tested in parallel. Their ranking of cytotoxicity in V79 cells was as follows: deoxynivalenol > enniatin B > patulin > ochratoxin A > zearalenone > citrinin. Moreover, enniatin B was found to induce nuclear fragmentation, a sign of apoptosis, already at low submicromolar concentrations. In summary, despite an apparent lack of mutagenic and genotoxic activity, enniatin B can cause pronounced cytotoxicity in mammalian cells, detectable at low micromolar concentrations.

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Acknowledgements

The authors gratefully acknowledge the excellent technical assistance of Ingrid Ester, Anke Jung and Brigitte Begher-Tibbe. Many thanks go to R. Dietrich for helpful discussions on morphological alterations induced by ionophoric cyclic peptides. This study was supported by a grant from the Ministerium für Innovation, Wissenschaft, Forschung und Technologie des Landes Nordrhein-Westfalen, Germany, for a collaborative project entitled ”Multikomponentenanalyse für Mykotoxine in Getreide und Futtermitteln” within EU-Ziel 2-program, NRW 2000-2006, Technologie- und Innovationsprogramm.

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  1. Leibniz-Institut für Arbeitsforschung an der TU Dortmund (IfADo), Leibniz Research Centre for Working Environment and Human Factors, Ardeystr. 67, 44139, Dortmund, Germany

    Wolfram Föllmann, Claudia Behm & Gisela H. Degen

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  1. Wolfram Föllmann
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  3. Gisela H. Degen
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Correspondence to Wolfram Föllmann.

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Föllmann, W., Behm, C. & Degen, G.H. The emerging Fusarium toxin enniatin B: in-vitro studies on its genotoxic potential and cytotoxicity in V79 cells in relation to other mycotoxins. Mycotox Res 25, 11–19 (2009). https://doi.org/10.1007/s12550-008-0002-y

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