Abstract
Glyphosate-based herbicides (GBH) are the most widely used herbicide for treatment of crops in the world. The digestive tract is one of the first systems exposed to pesticides, and damage to this system can affect the general health of individuals. The aim of this study was to evaluate the effects of subchronic inhalation and oral exposure to GBH on the digestive tract in rats. Six groups of Wistar rats (male and female) were exposed to nebulization with three concentrations of GBH [3.71 × 10−3 grams of active ingredient per hectare (g.a.i./ha), 6.19 × 10−3 g.a.i./ha and 9.28 × 10−3 g.a.i./ha] administered orally or by inhalation for 75 days. Bone marrow cells, smears of the tongue and fragments of the tongue, oesophagus, stomach and intestine were collected for histopathological analysis. Congestion, inflammation, an increase in the number of mast cells and nucleoli-organizing regions were detected in the tongue in the groups exposed to GBH. Females had a higher number of mast cells in the tongue than males. Animals in the groups exposed to higher concentrations of GBH showed dysplasia in the oesophagus and small and large intestine regardless of sex. Gastric changes were not observed. Animals exposed to GBH showed increased micronucleus formation. Our data indicate that GBH causes oral allergies and dysplastic lesions in the oesophagus and small and large intestine and has genotoxic potential.
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Acknowledgements
The authors would like to thank the technicians of the Laboratory of Surgical Pathology and Cytopathology at UNOESTE, Carlos Alexandre Santana de Oliveira, Mariana Fonseca Motta Borges and Talita Rizo Pereira, for the histological processing of the specimens.
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This study was financed with research funds from the Universidade do Oeste Paulista (UNOESTE). P. H. N. Chagas received a scholarship from the Scientific Initiation Scholarship Program of the National Council for Scientific and Technological Development (PIBIC/CNPq).
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FMS: performed the experiments, performed the analysis and interpretation of data and drafted the manuscript; JLSP: made substantial contributions to research design and performed the experiments; GASM, GMRHS, IBP and PHNC: performed the experiments; FMA: made substantial contributions to research design and performed the experiments; GAN: made substantial contributions to research design, performed histological analysis, prepared the histological images for publication and revised the manuscript critically for important intellectual content. All authors read and approved the final manuscript.
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de Maria Serra, F., Parizi, J.L.S., Odorizzi, G.A.S. et al. Subchronic exposure to a glyphosate-based herbicide causes dysplasia in the digestive tract of Wistar rats. Environ Sci Pollut Res 28, 61477–61496 (2021). https://doi.org/10.1007/s11356-021-15051-6
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DOI: https://doi.org/10.1007/s11356-021-15051-6