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Article Dans Une Revue Fish and Shellfish Immunology Année : 2020

Cellular and molecular complementary immune stress markers for the model species Dreissena polymorpha

Résumé

This study aimed to combine cellular and molecular analyses for better detail the effects of various stresses on a sentinel species of freshwater invertebrate. For this purpose, the hemocytes of the zebra mussel, Dreissena polymorpha, were exposed to different stresses at two different intensities, high or low: chemical (cadmium and ionomycin), physical (ultraviolet B), or biological ones (Cryptosporidium parvum and Toxoplasma gondii). After exposure, flow cytometry and droplet digital PCR analyses were performed on the same pools of hemocytes. Several responses related to necrosis, apoptosis, phagocytosis, production of nitric oxide and expression level of several genes related to the antioxidant, detoxification and immune systems were evaluated. Results showed that hemocyte integrity was compromised by both chemical and physical stress, and cellular markers of phagocytosis reacted to ionomycin and protozoa. While cadmium induced oxidative stress and necrosis, ionomycin tends to modulate the immune response of hemocytes. Although both biological stresses led to a similar immune response, C. parvum oocysts induced more effects than T. gondii, notably through the expression of effector caspases gene and an increase in hemocyte necrosis. This suggests different management of the two protozoa by the cell. This work provides new knowledge of biomarkers in the zebra mussel, at both cellular and molecular levels, and contributes to elucidate the mechanisms of action of different kinds of stress in this species.
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hal-03493366 , version 1 (21-11-2022)

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Paternité - Pas d'utilisation commerciale

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Antoine Le Guernic, Alain Geffard, Damien Rioult, Aurélie Bigot-Clivot, Maxime Leprêtre, et al.. Cellular and molecular complementary immune stress markers for the model species Dreissena polymorpha. Fish and Shellfish Immunology, 2020, 107, pp.452 - 462. ⟨10.1016/j.fsi.2020.10.027⟩. ⟨hal-03493366⟩
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