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Abamectin causes toxicity to the carp respiratory system by triggering oxidative stress, inflammation, and apoptosis and inhibiting autophagy

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Abstract

Abamectin is a commonly used pesticide in agriculture and fisheries and poses a risk to aquatic species. However, the mechanism of its toxic effects on fish remains to be discovered. In this study, we explored the effects of abamectin exposure at different concentrations on the respiratory system of carp. Carp were divided into three groups, namely the control group, low-dose abamectin treatment group, and high-dose abamectin treatment group. Gill tissue was collected after abamectin exposure for histopathological, biochemical, tunnel, mRNA, and protein expression analysis. Histopathological analysis indicated that abamectin damaged the gill structure. Biochemical analysis showed that abamectin triggered oxidative stress with lowered antioxidant enzyme activities and increased MDA content. Moreover, abamectin led to enhanced INOS levels and pro-inflammatory transcription, activating inflammation. Tunnel results demonstrated that exposure to abamectin induced gill cell apoptosis through an exogenous pathway. In addition, exposure to abamectin activated the PI3K/AKT/mTOR pathway, leading to inhibition of autophagy. Overall, abamectin caused respiratory system toxicity in carp via triggering oxidative stress, inflammation, and apoptosis and inhibiting autophagy. The study suggests that abamectin has a profound toxicity mechanism in the respiratory system of carp, contributing to a better understanding of pesticide risk assessment in aquatic systems.

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All data generated or analyzed during this study are available from the corresponding author on reasonable request.

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Acknowledgements

The work was supported by the Basic Science (Natural Science) Research Project of Higher Education of Jiangsu Province (no. 21KJB230001), the Open-end Funds of Jiangsu Key Laboratory of Marine Pharmaceutical Compound Screening (no. HY202101), and the Priority Academic Program Development of Jiangsu Higher Education Institutions of China. The authors thank these funders for their financial support. The funders had no role in the study design, data collection and analysis, publication decision, or manuscript preparation.

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Huimiao Feng: investigation, methodology, writing—original draft. Ping Zhou: investigation, methodology, writing—original draft. Feixue Liu: data curation, formal analysis. Wei Zhang: methodology, data curation, investigation. Haitao Yang: methodology, data curation, investigation. Xueqing Li: methodology, data curation, investigation. Jingquan Dong: conceptualization, funding acquisition, project administration, supervision. All authors read and approved the final manuscript.

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Correspondence to Jingquan Dong.

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Feng, H., Zhou, P., Liu, F. et al. Abamectin causes toxicity to the carp respiratory system by triggering oxidative stress, inflammation, and apoptosis and inhibiting autophagy. Environ Sci Pollut Res 30, 55200–55213 (2023). https://doi.org/10.1007/s11356-023-26166-3

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  • DOI: https://doi.org/10.1007/s11356-023-26166-3

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