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Cell Biology and Toxicology

, Volume 26, Issue 2, pp 165–176 | Cite as

Morphological alterations induced by boric acid and fipronil in the midgut of worker honeybee (Apis mellifera L.) larvae

Morphological alterations in the midgut of A. mellifera
  • Aline da Silva Cruz
  • Elaine C. M. da Silva-Zacarin
  • Odair C. Bueno
  • Osmar Malaspina
Article

Abstract

Morphological alterations, by means of histological and ultrastructural analysis, have been used to determine the effects of boric acid and fipronil on midgut tissues of honeybee worker, Apis mellifera L. larvae. In order to observe possible morphological alterations in the midgut, two groups of bioassays were performed. In the first one, the larvae were chronically treated with different concentrations of boric acid added to the food (1.0, 2.5 and 7.5 mg/g). In the second group, the larvae were fed with diets containing different concentrations of fipronil (0.1 and 1 μg/g) and compared with control groups without these chemical compounds. In the first bioassay, the larvae were collected on day 3 and in the second bioassay on day 4, when the mortality rate obtained in the toxicological bioassay was not very high. The larval midguts were removed and processed for morphological analyses using a light and transmission electron microscopy. We observed cytoplasmic vacuolizations, with the absence of autophagic vacuoles, and chromatinic compacting in most of the cells in the groups treated with pesticides. The morphological alterations were far greater in the larvae treated with boric acid than in the larvae treated with fipronil. Our data suggest that the midgut cell death observed was in response to boric acid and fipronil action. This study significantly improves the understanding of the toxicological effect of these insecticides from the ecotoxicological perspective.

Keywords

Ultrastructure Histology Boric acid Fipronil Midgut Honeybee larvae 

Notes

Acknowledgements

We thank CNPq for the financial support and the Department of Biology at UNESP-Rio Claro for the technical support.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Aline da Silva Cruz
    • 1
  • Elaine C. M. da Silva-Zacarin
    • 2
  • Odair C. Bueno
    • 1
  • Osmar Malaspina
    • 1
  1. 1.Biology Department, CEIS-Social Insects Studies CenterUNESPRio ClaroBrazil
  2. 2.Functional and Structural Biology LaboratorySão Carlos Federal University-Sorocaba CampusSorocabaBrazil

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