Journal
TOXINS
Volume 9, Issue 3, Pages -Publisher
MDPI AG
DOI: 10.3390/toxins9030087
Keywords
Aflatoxin B-1; Aspergillus flavus; hyssop; inhibition; oxidative stress
Categories
Funding
- project Aflafree [ANR-11-ALID-0003]
- project Aflared [001-2012STDF-AIRD]
- project ToxinFree (Campus France PHC cedre) [32763]
- Agence Nationale de la Recherche (ANR)
- Research Council of Saint-Joseph University (Lebanon)
- Consejo Nacional de Ciencia y Tecnologia (CONACYT) Mexico
- Agence Nationale de la Recherche (ANR) [ANR-11-ALID-0003] Funding Source: Agence Nationale de la Recherche (ANR)
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Of all the food-contaminating mycotoxins, aflatoxins, and most notably aflatoxin B-1 (AFB(1)), are found to be the most toxic and economically costly. Green farming is striving to replace fungicides and develop natural preventive strategies to minimize crop contamination by these toxic fungal metabolites. In this study, we demonstrated that an aqueous extract of the medicinal plant Micromeria graecaknown as hyssopcompletely inhibits aflatoxin production by Aspergillus flavus without reducing fungal growth. The molecular inhibitory mechanism was explored by analyzing the expression of 61 genes, including 27 aflatoxin biosynthesis cluster genes and 34 secondary metabolism regulatory genes. This analysis revealed a three-fold down-regulation of aflR and aflS encoding the two internal cluster co-activators, resulting in a drastic repression of all aflatoxin biosynthesis genes. Hyssop also targeted fifteen regulatory genes, including veA and mtfA, two major global-regulating transcription factors. The effect of this extract is also linked to a transcriptomic variation of several genes required for the response to oxidative stress such as msnA, srrA, catA, cat2, sod1, mnsod, and stuA. In conclusion, hyssop inhibits AFB(1) synthesis at the transcriptomic level. This aqueous extract is a promising natural-based solution to control AFB(1) contamination.
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