A clash on the Toll pathway: competitive action between pesticides and zymosan A on components of innate immunity in Apis mellifera

Author:

Sukkar Dani,Kanso Ali,Laval-Gilly Philippe,Falla-Angel Jairo

Abstract

BackgroundThe immune system of honeybees includes multiple pathways that may be affected by pesticide exposure decreasing the immune competencies of bees and increasing their susceptibility to diseases like the fungal Nosema spp. infection, which is detected in collapsed colonies.MethodsTo better understand the effect of the co-presence of multiple pesticides that interact with bees like imidacloprid and amitraz, we evaluated the expression of immune-related genes in honeybee hemocytes.ResultsImidacloprid, amitraz, and the immune activator, zymosan A, mainly affect the gene expression in the Toll pathway.DiscussionImidacloprid, amitraz, and zymosan A have a synergistic or an antagonistic relationship on gene expression depending on the level of immune signaling. The presence of multiple risk factors like pesticides and pathogens requires the assessment of their complex interaction, which has differential effects on the innate immunity of honeybees as seen in this study.

Publisher

Frontiers Media SA

Subject

Immunology,Immunology and Allergy

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