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How is the reaction of the Apis mellifera brain to a sublethal dose of thiamethoxam?

Grant number: 12/13370-8
Support type:Research Grants - Young Investigators Grants
Duration: May 01, 2013 - August 31, 2017
Field of knowledge:Biological Sciences - Zoology
Principal Investigator:Thaisa Cristina Roat
Grantee:Thaisa Cristina Roat
Home Institution: Centro de Estudos de Insetos Sociais (CEIS). Universidade Estadual Paulista (UNESP). Campus de Rio Claro. Rio Claro , SP, Brazil
Assoc. researchers:Carminda da Cruz-Landim ; Elaine Cristina Mathias da Silva Zacarin ; Mario Sergio Palma ; Osmar Malaspina ; Roberta Cornélio Ferreira Nocelli
Associated grant(s):14/50232-8 - Impact of neonicotinoids on gene expression and synaptic plasticity in bee brains, AP.R
Associated scholarship(s):13/07251-9 - How is the reaction of the Apis mellifera brain to a sublethal dose of thiamethoxam?, BP.JP


Pollination by Apis mellifera is extremely important ecologically as well as in agriculture, playing also an important role in beekeeping. However, some xenobiotic compounds, such as thiamethoxam introduced in agro ecosystems, are toxic to bees and have caused mass disappearance of colonies in several countries, risking the process of pollination and thus causing an environmental imbalance. Thiamethoxam is extremely active in the insect nervous system, acting as an agonist of acetylcholine. Therefore, this study aims to evaluate the acute oral toxicity of thiamethoxam to africanized Apis mellifera and investigate how the brain of these insects reacts to the intoxication by sublethal doses of tiametoxam. For this, will be investigated possible changes in synaptic pattern by immunolocalization of the protein synapsin, and spatial distribution of the proteins present in the brain by Maldi-imaging technique. These techniques, together, will provide information about which brain structures are affected by tiametoxam, which suggest possible physiological and behavioral consequences that such exposure may cause the insect. Through the obtained results we intend to elucidate the neurotoxic effect of the insecticide in order to understand how thiamethoxam can change the physiology of bees. On the other hand the observations of the effect of this insecticide on the nervous system of the bees may provide subsidies to observe behavioral changes that affect the intra-colonial. So, this study can contribute to clarify whether such insecticides would be among the causes of the "syndrome of the disappearance of bees" (Colony Collapse Disorder - CCD) currently worrying beekeepers and farmers. (AU)

Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CATAE, ALINE F.; DA SILVA MENEGASSO, ANALLY R.; PRATAVIEIRA, MARCEL; PALMA, MARIO S.; MALASPINA, OSMAR; ROAT, THAISA C. MALDI-imaging analyses of honeybee brains exposed to a neonicotinoid insecticide. Pest Management Science, v. 75, n. 3, p. 607-615, MAR 2019. Web of Science Citations: 0.
TAVARES, DAIANA ANTONIA; ROAT, THAISA CRISTINA; MATHIAS SILVA-ZACARIN, ELAINE CRISTINA; FERREIRA NOCEELLI, ROBERTA CORNELIO; MALASPINA, OSMAR. Exposure to thiamethoxam during the larval phase affects synapsin levels in the brain of the honey bee. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY, v. 169, p. 523-528, MAR 2019. Web of Science Citations: 1.
CATAE, ALINE FERNANDA; ROAT, THAISA CRISTINA; PRATAVIEIRA, MARCEL; DA SILVA MENEGASSO, ANALLY RIBEIRO; PALMA, MARIO SERGIO; MALASPINA, OSMAR. Exposure to a sublethal concentration of imidacloprid and the side effects on target and nontarget organs of Apis mellifera (Hymenoptera, Apidae). ECOTOXICOLOGY, v. 27, n. 2, p. 109-121, MAR 2018. Web of Science Citations: 7.
FRIOL, PRISCILA SEPULVEDA; CATAE, ALINE FERNANDA; TAVARES, DAIANA ANTONIA; MALASPINA, OSMAR; ROAT, THAISA CRISTINA. Can the exposure of Apis mellifera (Hymenoptera, Apiadae) larvae to a field concentration of thiamethoxam affect newly emerged bees?. Chemosphere, v. 185, p. 56-66, OCT 2017. Web of Science Citations: 5.
ROAT, THAISA C.; CARVALHO, STEPHAN M.; PALMA, MARIO S.; MALASPINA, OSMAR. BIOCHEMICAL RESPONSE OF THE AFRICANIZED HONEYBEE EXPOSED TO FIPRONIL. Environmental Toxicology and Chemistry, v. 36, n. 6, p. 1652-1660, JUN 2017. Web of Science Citations: 3.
ROAT, T. C.; DOS SANTOS-PINTO, J. R. A.; DOS SANTOS, L. D.; SANTOS, K. S.; MALASPINA, O.; PALMA, M. S. Modification of the brain proteome of Africanized honeybees (Apis mellifera) exposed to a subaEurolethal doses of the insecticide fipronil. ECOTOXICOLOGY, v. 23, n. 9, p. 1659-1670, NOV 2014. Web of Science Citations: 11.
CATAE, ALINE FERNANDA; ROAT, THAISA CRISTINA; DE OLIVEIRA, REGIANE ALVES; FERREIRA NOCELLI, ROBERTA CORNELIO; MALASPINA, OSMAR. Cytotoxic Effects of Thiamethoxam in the Midgut and Malpighian Tubules of Africanized Apis mellifera (Hymenoptera: Apidae). MICROSCOPY RESEARCH AND TECHNIQUE, v. 77, n. 4, p. 274-281, APR 2014. Web of Science Citations: 28.

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