<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The pathogenesis of varroasis has not been fully explained despite intensive research. Earlier studies suggested that parasitic infections caused by Varroa destructor mites were accompanied by immunosuppression in the host organism. The objective of this study was to analyse the influence of varroasis on one of the immune pathway in Apis mellifera measured by the expression of the prophenoloxidase (proPO) gene and the enzymatic activity of this gene’s product, phenoloxidase (EC 1.14.18.1). An evaluation was done of five developmental stages of honey bee workers and drones. The relative expression of proPO decreased in infected individuals. The only exceptions were worker prepupae (PP) and drone pupae with brown eyes and dark brown thorax (P5) where propo gene expression was 1.8-fold and 1.5-fold higher, respectively, than in the control. Phenoloxidase (PO) activity was 2.8-fold higher in infected pp workers and 2-fold higher in p5 drones in comparison with uninfected bees. Phenoloxidase activity was reduced in the remaining developmental stages of infected workers and drones. The relative expression of proPO was positively correlated with the relative PO activity in both workers (r = 0.988) and drones (r = 0.996). The results of the study indicate that V. destructor significantly influences the phenoloxidase-dependent immune pathway in honey bees.</p></abstract>

The pathogenesis of varroasis has not been fully explained despite intensive research. Earlier studies suggested that parasitic infections caused by Varroa destructor mites were accompanied by immunosuppression in the host organism. The objective of this study was to analyse the influence of varroasis on one of the immune pathway in Apis mellifera measured by the expression of the prophenoloxidase (proPO) gene and the enzymatic activity of this gene’s product, phenoloxidase (EC 1.14.18.1). An evaluation was done of five developmental stages of honey bee workers and drones. The relative expression of proPO decreased in infected individuals. The only exceptions were worker prepupae (PP) and drone pupae with brown eyes and dark brown thorax (P5) where propo gene expression was 1.8-fold and 1.5-fold higher, respectively, than in the control. Phenoloxidase (PO) activity was 2.8-fold higher in infected pp workers and 2-fold higher in p5 drones in comparison with uninfected bees. Phenoloxidase activity was reduced in the remaining developmental stages of infected workers and drones. The relative expression of proPO was positively correlated with the relative PO activity in both workers (r = 0.988) and drones (r = 0.996). The results of the study indicate that V. destructor significantly influences the phenoloxidase-dependent immune pathway in honey bees.

Expression of the Prophenoloxidase Gene and Phenoloxidase Activity, During the Development of Apis Mellifera Brood Infected with Varroa Destructor

University of Warmia and Mazury, Faculty of Biology and Biotechnology, Department of Biochemistry, Oczapowski 1A, 10-957 Olsztyn, Poland

Journal of Apicultural Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The pathogenesis of varroasis has not been fully explained despite intensive research. Earlier studies suggested that parasitic infections caused by Varroa...

Expression of the Prophenoloxidase Gene and Phenoloxidase Activity, During the Development of Apis Mellifera Brood Infected with Varroa Destructor

Published Online: Dec 09, 2015

Page range: 85 - 93

Received: Mar 13, 2015

Accepted: Oct 07, 2015

DOI: https://doi.org/10.1515/jas-2015-0025

Keywords
Apis mellifera, phenoloxidase activity, prophenoloxidase gen expression, Varroa destructor

© by Ewa A. Zaobidna

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Expression of the Prophenoloxidase Gene and Phenoloxidase Activity, During the Development of Apis Mellifera Brood Infected with Varroa Destructor

Published Online: Dec 09, 2015

Page range: 85 - 93

Received: Mar 13, 2015

Accepted: Oct 07, 2015

DOI: https://doi.org/10.1515/jas-2015-0025

KeywordsApis mellifera, phenoloxidase activity, prophenoloxidase gen expression, Varroa destructor

© by Ewa A. Zaobidna

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Apis mellifera, phenoloxidase activity, prophenoloxidase gen expression, Varroa destructor