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The control of Aedes aegypti is nowadays one of the major public health problems in Brazil, being the main vector of dengue and urban yellow fever. Of African origin, this mosquito is well adapted to Brazilian climatic conditions and is now distributed in all states. The usual methods to combat and control the mosquito have been highly questioned. The chemical insecticides currently used have led to the emergence of resistant populations of mosquitoes and the consequent increase of its density, causing significant epidemics of dengue. Insecticides of botanical origin have shown to be alternative candidates to their control. This work presents for the first time, morphohistologic changes caused by the larvicidal activity of tannin catechin extracted from Magonia pubescens on larvae of A. aegypti, showing the potential of this natural larvicidal compound. Larvae of the 3rd stage were submitted to a water solution of tannin catechins, at 37ppm, where they remained for up to 24 h. Larvae that reached lethargic state were collected and fixed in paraformaldehyde at 4%, in sodium cacodylate buffer at 0.1 M and pH 7.2, included in resin, mounted on slides, stained with hematoxylin-eosin and analyzed by light microscope. The main cell toxic effects of tannin catechin on larvae of A. aegypti were the high vacuolation and absence of cytoplasmic limits, vesicular apical formation with release of cytoplasmic content, increase in intercellular spaces and detachment of cells from the basal membrane.

revista de patologia tropical / journal of tropical pathology

Alterações morfo-histológicas em larvas de Aedes aegypti (linnaeus, 1762) (Diptera, Culicidae) causadas pelo tanino catéquico isolado da planta do cerrado Magonia pubescens (Sapindaceae)