Sokoine University of Agriculture

An in vitro investigation of endocrine disrupting effects of trichothecenes deoxynivalenol (DON), T-2 and HT-2 toxins

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dc.contributor.author Ndossi, D. G.
dc.contributor.author Frizzell, C.
dc.contributor.author Tremoen, N. H.
dc.contributor.author Fæste, C.K.
dc.contributor.author Verhaegen, S.
dc.contributor.author Dahl, E.
dc.contributor.author Eriksen, G. S.
dc.contributor.author Sørlie, M.
dc.contributor.author Connolly, L.
dc.contributor.author Ropstad, E.
dc.date.accessioned 2020-04-01T10:18:08Z
dc.date.available 2020-04-01T10:18:08Z
dc.date.issued 2012
dc.identifier.uri http://www.suaire.sua.ac.tz/handle/123456789/2976
dc.description Journal article pg. 268-278 en_US
dc.description.abstract Trichothecenes are a large family of chemically related mycotoxins. Deoxynivalenol (DON), T-2 and HT-2 toxins belong to this family and are produced by various species of Fusarium. The H295R steroidogenesis assay, regulation of steroidogenic gene expression and reporter gene assays (RGAs) for the detection of androgen, estrogen, progestagen and glucocorticoid (ant)agonist responses, have been used to assess the endocrine disrupting activity of DON, T-2 and HT-2 toxins. H295R cells were used as a model for steroidogenesis and gene expression studies and exposed with either DON (0.1–1000 ng/ml), T-2 toxin (0.0005–5 ng/ml) or HT-2 toxin (0.005–50 ng/ml) for 48 h. We observed a reduction in hormone levels in media of exposed cells following radioimmunoassay. Cell via- bility was determined by four colorimetric assays and we observed reduced cell viability with increasing toxin concentrations partly explaining the significant reduction in hormone levels at the highest toxin concentration of all three trichothecenes. Thirteen of the 16 steroidogenic genes analyzed by quantitative real time PCR (RT-qPCR) were signifi- cantly regulated (P < 0.05) by DON (100 ng/ml), T-2 toxin (0.5 ng/ml) and HT-2 toxin (5 ng/ml) compared to the control, with reference genes (B2M, ATP5B and ACTB). Whereas HMGR and CYP19 were down- regulated, CYP1A1 and CYP21 were up-regulated by all three trichothecenes. DON further up-regulated CYP17, HSD3B2, CYP11B2 and CYP11B1 and down-regulated NR5A1. T-2 toxin caused down-regulation of NR0B1 and NR5A1 whereas HT-2 toxin induced up-regulation of EPHX and HSD17B1 and down-regulation of CYP11A and CYP17. The expressions of MC2R, StAR and HSD17B4 genes were not significantly affected by any of the trichothecenes in the present study. Although the results indicate that there is no evidence to suggest that DON, T-2 and HT-2 toxins directly interact with the steroid hormone receptors to cause endocrine disruption, the present findings indicate that exposure to DON, T-2 toxin and HT-2 toxin have effects on cell viability, steroidogenesis and alteration in gene expression indicating their potential as endocrine disruptors. en_US
dc.language.iso en en_US
dc.publisher Elsevier Ltd. en_US
dc.subject Endocrine disruptor en_US
dc.subject Steroidogenesis en_US
dc.subject H295R en_US
dc.subject Reporter gene assay en_US
dc.subject Gene expression en_US
dc.title An in vitro investigation of endocrine disrupting effects of trichothecenes deoxynivalenol (DON), T-2 and HT-2 toxins en_US
dc.type Article en_US
dc.url http://dx.doi.org/10.1016/j.toxlet.2012.09.005 en_US


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