Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 418576
Title The effects of deoxynivalenol on gene expression in the murine thymus
Author(s) Kol, S.; Hendriksen, P.J.M.; Loveren, H. van; Peijnenburg, A.A.C.M.
Source Toxicology and Applied Pharmacology 250 (2011)3. - ISSN 0041-008X - p. 299 - 311.
Department(s) Rikilt B&T Toxicologie en Effectanalyse
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) trichothecene vomitoxin deoxynivalenol - human cell-cycle - oral-exposure - in-vivo - tissue distribution - negative selection - immune-response - t-cells - mechanisms - mouse
Abstract Deoxynivalenol (DON) is a mycotoxin produced by several Fusarium species and is often detected in grains. Because of its high abundance, there has been a large interest in the effects of DON in animals and humans. DON is known to be immunosuppressive at high concentrations and immunostimulatory at low concentrations. The present study aimed to acquire insight into the modes of action of DON. For this, C57Bl6 mice were orally exposed to 5, 10, or 25 mg/kg bw DON for 3, 6, or 24 h and thymuses were subjected to genome-wide expression microarray analysis. Gene set enrichment analysis (GSEA) demonstrated that DON downregulated genes involved in proliferation, mitochondria, protein synthesis, and ribosomal proteins. Furthermore, GSEA showed a selective downregulation of genes highly expressed at the early precursor thymocytes stage. This indicates that early precursor thymocytes, particularly at the double-positive CD4+CD8+ stage, are more vulnerable to DON than very early or late precursor thymocytes. There was a large overlap of genes upregulated by DON with genes previously reported to be either upregulated during T cell activation or upregulated during negative selection of thymocytes that recognize “self-antigens”. This indicates that DON induces cellular events that also occur after activation of the T cell receptor, for example, release of calcium from the endoplasmatic reticulum. This T cell activation in the thymus then evokes negative selection and depletion of thymocytes, which provides a plausible explanation for the high sensitivity of the thymus for DON exposure. The expression patterns of four genes indicative for some of the processes that were affected after DON treatment were confirmed using real-time PCR. Immunocytological experiments with primary mouse thymocytes demonstrated the translocation of NFAT from the cytoplasm into the nucleus upon exposure top DON, thus providing further evidence for the involvement of T cell activation.
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