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Caractérisation des sous-types de récepteurs nicotiniques neuronaux d'insectes et étude de la modulation de leurs profils pharmacologiques par les insecticides néonicotinoïdes

Abstract : The intensive use of insecticides against crop pests and vectors of human and animal leads to several polemics about their mode of action. All these controversies are related to the fact that the mode of action of insecticides in insects is poorly unknown, in particular neonicotinoids which act on nicotinic acetylcholine (ACh) receptors (nAChR).During this PhD thesis, we characterized for the first time the pharmacological properties of a cockroach ⍺7 homomeric receptor in a xenopus oocyte. Our results revealed that cockroach ⍺7 in an atypical receptor that is insensitive to ⍺-bungarotoxin and not activated by neonicotinoids. Cockroach and rat ⍺7 receptors which are included in the same cluster have distinct pharmacological properties. We then studied the pharmacological properties of native receptors, in particular, the modulatory effect of permethrin on dinotefuran-induced currents. This work was included in the study of Vectra 3D. We also evaluated the use of insect central nervous system membrane extraction as a strategy to study the pharmacological properties of insect native nAChRs.To conclude, this PhD contribute to the study of the pharmacological properties of insect nAChRs and the study of the mode of action of neonicotinoids insecticides.
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Alison Cartereau. Caractérisation des sous-types de récepteurs nicotiniques neuronaux d'insectes et étude de la modulation de leurs profils pharmacologiques par les insecticides néonicotinoïdes. Sciences agricoles. Université d'Orléans, 2018. Français. ⟨NNT : 2018ORLE2031⟩. ⟨tel-02102664⟩

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