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Evaluation the Toxicity of Heavy Metal Mixtures in Anecic Earthworms (Aporrectodea giardi)

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Abstract

Using earthworms as bioindicators of heavy metal contamination in soils is a relevant tool for environmental risk monitoring. This study examines the combined effects of four distinct concentrations mixtures (M1, M2, M3 and M4) containing Cd, Cr, Cu, Ni, Fe and Mn on Aporrectodea giardi earthworms after 12 and 24 days (12 D/24 D) of exposure via the monitoring of certain biomarkers of stress including total protein content, glutathione (GSH), metallothionein (MT), catalase and lipoxygenase (LOX) activities. The results show a decrease in the total protein level for the M3 mixture after 24 D, whereas it increases for all other treatments regardless of exposure time. Glutathione and metallothionine levels increased for M2 and M3 and decreased for M1 and M4 after 12 D; they increased after 24 D for all the mixtures. Regarding enzyme activities, catalase activity was decreased for all the treatments unless for M3 (P > 0.05). However, LOX increased for M1, M2 and M4 except for M3 after 12 D, when inhibition of this biomarker was observed. LOX activity was inhibited for all the mixtures at the end of the treatment. All the mixtures generated oxidative stress in Aporrectodea giardi, which is minimized by increasing MT levels to remove the metal ions and triggering the antioxidant system, composed primarily of GSH and LOX to restore cellular homeostasis. These findings suggest that the species Aporrectodea giardi could be an excellent candidate for ecotoxicological risk assessment of soils contaminated by metal mixtures and it can be used in bioremediation for its fitness which allows it to tolerate high concentrations of metal mixtures.

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Acknowledgements

The authors would like to acknowledge the members of the Laboratory of Cellular Toxicology, Department of Biology, Faculty of Sciences, University of Badji Mokhtar, Annaba, Algeria, for furnishing all the chemical and biological materials required for this study. We are very grateful to Mr. Khaled Ourabah of the Research and Development Centre, Algeria, for technical assistance.

Funding

This work was supported by the Algerian Ministry of Higher Education and Scientific Research.

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All authors contributed to the study conception and design. [Corresponding Author: SH] has setting up the thematic. Material preparation, data collection and analysis were performed by [First author: BH]. The first draft of the manuscript was written by the first author and all authors corrected and commented on previous versions of the manuscript.

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Correspondence to Hana Sbartai.

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The authors have no relevant financial or non-financial interests to disclose.

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Benhalima, H., Sbartai, H. & Sbartai, I. Evaluation the Toxicity of Heavy Metal Mixtures in Anecic Earthworms (Aporrectodea giardi). Arch Environ Contam Toxicol 86, 13–24 (2024). https://doi.org/10.1007/s00244-023-01034-w

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  • DOI: https://doi.org/10.1007/s00244-023-01034-w

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