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Acute exposition to Roundup Transorb® induces systemic oxidative stress and alterations in the expression of newly sequenced genes in silverside fish (Odontesthes humensis)

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Abstract

Roundup Transorb® (RDT) is a glyphosate-based herbicide commonly used in agricultural practices worldwide. This herbicide exerts negative effects on the aquatic ecosystem and affects bioenergetic and detoxification pathways, oxidative stress, and cell damage in marine organisms. These effects might also occur at the transcriptional level; however, the expression of genes associated with oxidative stress has not been studied well. Odontesthes humensis is a native Brazilian aquatic species naturally distributed in the habitats affected by pesticides, including Roundup Transorb® (RDT). This study evaluated the toxic effects of short-term exposure to RDT on O. humensis. Moreover, the genes related to oxidative stress were sequenced and characterized, and their expressions in the gills, hepatopancreas, kidneys, and brain of the fish were quantified by quantitative reverse transcription-polymerase chain reaction. The animals were exposed to two environmentally relevant concentrations of RDT (2.07 and 3.68 mg L−1) for 24 h. Lipid peroxidation, reactive oxygen species (ROS), DNA damage, and apoptosis in erythrocytes were quantified by flow cytometry. The expression of the target genes was modulated in most tissues in the presence of the highest tested concentration of RDT. In erythrocytes, the levels of lipid peroxidation, ROS, and DNA damage were increased in the presence of both the concentrations of RDT, whereas cell apoptosis was increased in the group exposed to 3.68 mg L−1 RDT. In conclusion, acute exposure to RDT caused oxidative stress in the fish, induced negative effects on cells, and modulated the expression of genes related to the enzymatic antioxidant system in O. humensis.

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Funding

This study was supported by the Ministério da Ciência, Tecnologia e Inovação/Conselho Nacional de Desenvolvimento Científico e Tecnológico (Edital Universal #422292/2016–8), Fundação de Amparo à pesquisa do Estado do Rio Grande do Sul (FAPERGS-FAPESP # 19/2551–0002283–2 and FAPERGS PqG # 17/2551–0000953–3), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (AUXPE #2537/2018). ASVJ, CD, AB, and VFC are also individually supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico.

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AWSM and TLRS conducted all experiments and were major contributors in writing the manuscript. MHR, WBD, and END conducted the gene cloning and qRT-PCR experiments. ASVJ and CDC conducted and analyzed flow cytometry experiments. PGC and AB performed an evaluation of real concentrations of glyphosate. GMS and RBR designed the experiments and analyzed data. VFC was responsible for project administration, funding acquisition, and writing the manuscript. All authors read and approved the final manuscript.

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Correspondence to Vinicius Farias Campos.

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The methodology used in this study was approved by the Ethics Committee of the Federal University of Pelotas/RS, Brazil, (number 23110.007018/2015–85).

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The authors declare no competing interests.

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Responsible Editor: Bruno Nunes

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Martins, A.W.S., Silveira, T.L.R., Remião, M.H. et al. Acute exposition to Roundup Transorb® induces systemic oxidative stress and alterations in the expression of newly sequenced genes in silverside fish (Odontesthes humensis). Environ Sci Pollut Res 28, 65127–65139 (2021). https://doi.org/10.1007/s11356-021-15239-w

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  • DOI: https://doi.org/10.1007/s11356-021-15239-w

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