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Mushrooms versus fungi: natural compounds from Lentinula edodes inhibit aflatoxin biosynthesis by Aspergillus parasiticus

in World Mycotoxin Journal
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M. Reverberi Department of Environmental Biology, Sapienza University of Rome, L. go Cristina di Svezia 24, 00165 Rome, Italy

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S. Zjalic Department of Mediterranean Agriculture and Aquaculture, University of Zadar, M. Pavlinovica bb, 23 000 Zadar, Croatia

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A. Ricelli Istituto di Chimica Biomolecolare, CNR, P. le Aldo Moro 5, 00189 Rome, Italy

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C. Di Meo Department of Drug Chemistry and Technologies, Sapienza University of Rome, P. le Aldo Moro 5, 00185 Rome, Italy

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M. Scarpari Department of Environmental Biology, Sapienza University of Rome, L. go Cristina di Svezia 24, 00165 Rome, Italy

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C. Fanelli Department of Environmental Biology, Sapienza University of Rome, L. go Cristina di Svezia 24, 00165 Rome, Italy

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A. Fabbri Department of Environmental Biology, Sapienza University of Rome, L. go Cristina di Svezia 24, 00165 Rome, Italy

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Although the strategies routinely adopted to limit production of carcinogenic aflatoxins by Aspergillus parasiticus and Aspergillus flavus in foods and feeds can be quite effective, they are often neither environmentally friendly, nor non-toxic for end users. Polysaccharides and glycoproteins, particularly β-glucans from the basidiomycete Lentinula edodes, already known for their health-promoting effects on animals and humans, have previously demonstrated the ability to inhibit aflatoxin biosynthesis by stimulating the antioxidant defences of the toxigenic fungus. Here the results of a study regarding the influence on polysaccharide production by L. edodes of oxidative stress induced using paraquat (PQ) treatment are reported. Paraquat 0.5 and 1 mM resulted in an enhancement of the expression of the β-glucan synthase gene Lefks1 and a consequent stimulating effect (about 30-35%) on β-glucans production. Moreover, oxidative-stress (PQ) induced polysaccharides have a higher aflatoxin inhibiting capacity in two different strains of A. parasiticus in comparison with non-induced polysaccharides. This more efficient inhibition might be explained by a higher content of β-glucans because 1H-NMR analysis revealed no obvious qualitative differences between PQ-induced and non-induced polysaccharides. The results obtained show promise for improving the quantity and efficiency of L. edodes extracts in order to achieve enhanced control over aflatoxin biosynthesis in foods and feeds using health-promoting and environmentally-friendly compounds.

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