2017-05-302013-02-15ANTUNES, A. M. Avaliação da exposição aguda e sub-letal ao glifosato (N-fosfometil-glicina) e ao AMPA (ácido amino-metil-fosfônico) em brânquias e fígado de Poecilia reticulata com o emprego de biomarcadores moleculares e morfológicos. 2013. 68 f. Dissertação (Mestrado em Biologia) - Universidade Federal de Goiás, Goiânia, 2013.http://repositorio.bc.ufg.br/tede/handle/tede/7383The present research aimed to investigate the acute toxicity of glyphosate (Nphosphomethyl-glycine), the active ingredient of Roundup®, as well as of aminomethylphosphonic acid (AMPA), its main degradation product, in the teleost fish Poecilia reticulata, commonly known as guppies. Thus, were performed tests Lethal Concentration mean (LC50) and behavioral, histopathology and proteomics analysis. Male and female P. reticulata presented median lethal concentration (LC50) at 96h the values of 68.78 and 70.87 mg/L for glyphosate and 180.00 and 164.32 mg/L for AMPA, respectively, characterizing them as practically non toxic compounds to guppies. However, the results of behavioral analyses showed that both products generate stressing situations to the fish, causing behavioral changes such shock against the tank walls, hypoactivity, irregular swimming, swimming on the surface of water, darkening of the body, aggressiveness, and lethargy. Histopathological and morphometric analyses of liver and gill of guppies exposed to sublethal concentrations of glyphosate (35mg/L) and AMPA (82 mg/L) indicated that both organs were affected . The gills of fish exposed to the tested products presented higher reaction rates to progressive changes, such as proliferation of the interlamellar epithelium and partial and total fusion of secondary lamellae. Liver presented higher reaction rates to regressive changes, such as steatosis, pyknotic nuclei, and necrosis. The proteomic analysis showed that Glyphosate induces differential liver proteins in P. reticulata. The image analysis allowed measuring 225 spots in the control group and 180 spots in the group exposed to Glyphosate. Of this total, 88 spots were exclusive to the control group and 43 spots were exclusive of the treated group. Of the 137 spots matched between control and treated groups 13 were down regulated and 8 were up regulated due to sublethal exposure to Glyphosate. The behavioral, histopathological and proteomic changes observed indicated that, although considered to have low toxicity to animals in the guides that evaluate toxicity of chemicals, both glyphosate and AMPA promote that are deleterious to animal health, indicating the need to establish new parameters or modify concepts indicating the need to use several biomarkers, beyond assessing the mortality rate, to establish a more reliable criteria for toxicity parameters.application/pdfAcesso AbertoPeixesHerbicidasSaúde animalToxidade aquáticaExposição agudaFishesHerbicidesAnimal healthAquatic toxicityAcute exposureCIENCIAS BIOLOGICAS::BIOLOGIA GERALDissertação