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János Győri Balaton Limnological Institute, H-8237 Tihany, POB 35, Hungary

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Anna Farkas Balaton Limnological Institute, H-8237 Tihany, POB 35, Hungary

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Oksana Stolyar Ternopil National Pedagogical University, M. Kryvonosa Str., 2, Ternopil, 46027, Ukraine

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András Székács National Agricultural Research and Innovation Centre, H-1022 Budapest, Herman O. u. 15, Hungary

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Mária Mörtl National Agricultural Research and Innovation Centre, H-1022 Budapest, Herman O. u. 15, Hungary

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Ágnes Vehovszky Balaton Limnological Institute, H-8237 Tihany, POB 35, Hungary

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There is a great concern about the decline of pollinators, and neonicotinoids emerging bee disorders are assumed to play a significant role. Since changes in learning ability has been observed in honey bees exposed to some acetylcholine esterase (AChE) inhibitors, we therefore, tested in vitro the effect of four neonicotinoids on purified eel AChE. AChE activity was inhibited in a concentration-dependent manner, and calculated IC50 values for thiamethoxam (IC50 = 414 μM) and clothianidin (IC50 = 160 μM) were found to be much higher compared to acetamiprid (IC50 = 75.2 μM) and thiacloprid (IC50 = 87.8 μM). The Lineweaver–Burk reciprocal plots for acetamiprid shows unchanged Vmax and increased Km values with inhibitor concentrations, while analysis of Michaelis–Menten plots shows predominantly competitive mechanism. The inhibition constant value (Ki = 24.3 μM) indicates strong binding of the acetamiprid complex to AChE. Finally, the four tested neonicotinoids are not a uniform group regarding their blocking ability. Our results suggest a previously not established, direct AChE blocking mechanism of neonicotinoids tested, thus the neuronal AChE enzyme is likely among the direct targets of the neonicotinoid insecticides. We conclude, that these AChE inhibitory effects may also contribute to toxic effects on the whole exposed animal.

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Editorial Board

    1. Csányi, Vilmos (Göd)
    1. Dudits, Dénes (Szeged)
    1. Falus, András (Budapest)
    1. Fischer, Ernő (Pécs)
    1. Gábriel, Róbert (Pécs)
    1. Gulya, Károly (Szeged)
    1. Gulyás, Balázs (Stockholm)
    1. Hajós, Ferenc (Budapest)
    1. Hámori, József (Budapest)
    1. Heszky, László (Gödöllő)
    1. Hideg, Éva (Szeged)
    1. E. Ito (Sanuki)
    1. Janda, Tibor (Martonvásár)
    1. Kavanaugh, Michael P. (Missoula)
    1. Kása, Péter (Szeged)
    1. Klein, Éva (Stockholm)
    1. Kovács, János (Budapest)
    1. Brigitte Mauch-Mani (Neuchâtel)
    1. Nässel, Dick R. (Stockholm)
    1. Nemcsók, János (Szeged)
    1. Péczely, Péter (Gödöllő)
    1. Roberts, D. F. (Newcastle-upon-Tyne)
    1. Sakharov, Dimitri A. (Moscow)
    1. Singh, Meharvan (Fort Worth)
    1. Sipiczky, Mátyás (Debrecen)
    1. Szeberényi, József (Pécs)
    1. Székely, György (Debrecen)
    1. Tari, Irma (Szeged)
    1. Vágvölgyi, Csaba (Szeged),
    1. L. Zaborszky (Newark)

 

Acta Biologica Hungarica
P.O. Box 35
H-8237 Tihany, Hungary
Phone: (36 87) 448 244 ext. 103
Fax: (36 87) 448 006
E-mail: elekes@tres.blki.hu

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Acta Biologica Hungarica
Language English
Size  
Year of
Foundation
1950
Publication
Programme
changed title
Volumes
per Year
 
Issues
per Year
 
Founder Magyar Tudományos Akadémia
Founder's
Address
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5383 (Print)
ISSN 1588-256X (Online)