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Lipid peroxidation, oxidative stress and respiratory metabolism alteration in the freshwater ciliate Paramecium tetraurelia exposed to cypermethrin, a pyrethroid insecticide

Rima Amamra, Mohamed Réda Djebar, Ouissem Moumeni, Zoubi Azzouz, Ibtissem Zeriri, Amira Atailia, Sana Benosmane, Houria Berrebbah

Laboratory of Cellular Toxicology, Department of Biology, Faculty of Sciences, Badji Mokhtar University, Annaba, Algeria

Key words: Cypermethrin, Paramecium tetraurelia, Lipid peroxidation, Oxidative stress, Respiratory metabolism


F1.mediumnOxidative damage by increased production of reactive oxygen species have been involved in the toxicity of several pesticides. Thus, the aim of this study was to investigate the effect of cypermethrin, a widely used type II pyrethroid, on the oxidative stress biomarkers and the respiratory metabolism of Paramecium tetraurelia. Different concentrations of the insecticide (0.05, 0.5, 1 and 2 μg/l) were incubated with Paramecium cells. The 96h (IC50) was determined. Variations in lipid content and oxidative stress biomarkers such as: Malondialdehyde (MDA), Glutathione (GSH), Glutathione peroxidase (GPx) and Lactate dehydrogenase (LDH) were carried. Moreover, respiratory metabolism was followed up. The estimated 96h (IC50) value for Paramecium tetraurelia exposed to cypermethrin in our study was 1.26 μg/l. Significant decrease was observed in total lipids content. Cypermethrin exposure has led to a lipid peroxidation supported by a significant increase in (MDA) level which might be associated with decreased level of (GSH). (GPx) and (LDH) activities, antioxidant enzymes, were significantly induced. The response was concentration dependent especially for the highest concentration. A strong disturbance in respiratory metabolism was observed. In summary, under the current experimental conditions, lipid peroxidation, oxidative stress and alteration in respiratory metabolism are involved in the toxicity of cypermethrin to the ciliate Paramecium tetraurelia. Likewise, due to its susceptibility, Paramecium could be used as an ideal model for studying toxicity of environmental contaminants.

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