Inhibition, recovery and oxime-induced reactivation of muscle esterases following chlorpyrifos exposure in the earthworm Lumbricus terrestris
2010
Collange, Beatrice | Wheelock, C.E. | Rault-Léonardon, Magali | Mazzia, Christophe | Capowiez, Yvan | Sanchez-Hernandez, J.C. | Abeilles et Environnement (AE) ; Institut National de la Recherche Agronomique (INRA)-Avignon Université (AU) | Avignon Université (AU) | Department of Medical Biochemistry and Biophysics ; Karolinska Institutet [Stockholm] | Unité de recherche Plantes et Systèmes de Culture Horticoles (PSH) ; Institut National de la Recherche Agronomique (INRA) | Universidad de Castilla-La Mancha = University of Castilla-La Mancha (UCLM) | Consejería de Educación y Ciencia (PCI08-0049-0228) ; Ministerio de Ciencia e Innovación (CTM 2006-11828/TECNO) ; Centre for Allergy Research Fellowship
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Show more [+] Less [-]English. Assessment of wildlife exposure to organophosphorus (OP) pesticides generally involves the measurement of cholinesterase (ChE) inhibition, and complementary biomarkers (or related endpoints) are rarely included. Herein, we investigated the time course inhibition and recovery of ChE and carboxylesterase (CE) activities in the earthworm Lumbricus terrestris exposed to chlorpyrifos, and the ability of oximes to reactivate the phosphorylated ChE activity. Results indicated that these esterase activities are a suitable multibiomarker scheme for monitoring OP exposure due to their high sensitivity to OP inhibition and slow recovery to full activity levels following pesticide exposure. Moreover, oximes reactivated the inhibited ChE activity of the earthworms exposed to 12 and 48 mg kg−1 chlorpyrifos during the first week following pesticide exposure. This methodology is useful for providing evidence for OP-mediated ChE inhibition in individuals with a short history of OP exposure (≤1 week); resulting a valuable approach for assessing multiple OP exposure episodes in the field. Esterase inhibition combined with oxime reactivation methods is a suitable approach for monitoring organophosphate contamination
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