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Genotoxic, cytotoxic, and cytopathological effects in rats exposed for 18 months to a mixture of 13 chemicals in doses below NOAEL levels




TekijätAristidis Tsatsakis, Anca Oana Docea, Carolina Constantin, Daniela Calina, Ovidiu Zlatian, Taxiarchis Konstantinos Nikolouzakis, Polychronis D. Stivaktakis, Alexandra Kalogeraki, Jyrki Liesivuori, George Tzanakakis, Monica Neagu

KustantajaELSEVIER IRELAND LTD

Julkaisuvuosi2019

JournalToxicology Letters

Tietokannassa oleva lehden nimiTOXICOLOGY LETTERS

Lehden akronyymiTOXICOL LETT

Vuosikerta316

Aloitussivu154

Lopetussivu170

Sivujen määrä17

ISSN0378-4274

eISSN1879-3169

DOIhttps://doi.org/10.1016/j.toxlet.2019.09.004


Tiivistelmä
The present study investigates the genotoxic and cytotoxic effects of long term exposure to low doses of a mixture consisting of methomyl, triadimefon, dimethoate, glyphosate, carbaryl, methyl parathion, aspartame, sodium benzoate, EDTA, ethylparaben, buthylparaben, bisphenol A and acacia gum in rats. Four groups of ten Sprangue Dawley rats (5 males and 5 females per group) were exposed for 18 months to the mixture in doses of 0xNOAEL, 0.0025xNOAEL, 0.01xNOAEL and 0.05xNOAEL (mg/kg bw/day). After 18 months of exposure, the rats were sacrificed and their organs were harvested. Micronuclei frequency was evaluated in bone marrow erythrocytes whereas the organs were cytopathologically examined by the touch preparation technique. The exposure to the mixture caused a genotoxic effect identified only in females. Cytopathological examination showed specific alterations of tissue organization in a tissue-type dependent manner. The observed effects were dose-dependent and correlated to various tissue parameters. Specifically, testes samples revealed degenerative and cellularity disorders, liver hepatocytes exhibited decreased glycogen deposition whereas degenerative changes were present in gastric cells. Lung tissue presented increased inflammatory cells infiltration and alveolar macrophages with enhanced phagocytic activity, whereas brain tissue exhibited changes in glial and astrocyte cells' numbers. In conclusion, exposure to very low doses of the tested mixture for 18 months induces genotoxic effects as well as monotonic cytotoxic effects in a tissue-dependent manner.



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