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RESUMO: O presente estudo avaliou a hepatotoxicidade induzida pelo CCl4 durante o efeito glicocorticoide da dexametasona (DEX) na fisiopatologia da reação inflamatória aguda em tilápias do Nilo, Oreochromis niloticus, correlacionando a funcionalidade hepática à cinética de acúmulo celular em aerocistite infecciosa. Para tal, utilizou-se 84 tilápias do Nilo distribuídas em 4 tratamentos: controle, CCl4, DEX e CCl4+DEX. Sendo amostrados 7 animais por tratamento em três períodos, isto é: seis, 24 e 48h após indução de inflamação. Utilizou-se CCl4 em dose única de 0,5mL/kg, via intraperitoneal para causar o transtorno hepático. Para indução da aerocistite utilizou-se inóculo de Aeromonas hydrophila. A dexametasona foi administrada via intramuscular na dose de 2 mg/kg de peso vivo. Os resultados revelaram que quanto maior foi à atividade sérica de aspartato aminotransferase (AST) maior foi a alteração somática do fígado, sendo estes achados inversamente proporcionais ao acúmulo celular no foco inflamatório, demonstrando menor número de células inflamatórias nos animais acometidos com maior grau de distúrbios hepáticos induzidos pelo CCl4. O estudo histopatológico revelou alterações degenerativas transitórias na fase mais aguda, pois os fígados das tilápias revelaram o acúmulo lipídeos nos hepatócitos 6h após administração de CCl4, sendo esta degeneração gordurosa não mais observada nos tempos de 24 e 48h. Contudo, a administração de CCl4 em tilápias do Nilo resultou em degeneração hepática aguda e transitória, caracterizada pelo acúmulo de gordura nos hepatócitos, aumento de AST no sangue e hepatomegalia. Com a disfunção hepática houve comprometimento do recrutamento celular em aerocistite infecciosa, indicando que há participação do fígado na resposta imune inata em peixes. ABSTRACT: The study evaluated the hepatotoxicity induced by CCl4 during the glucocorticoid effect of dexamethasone (DEX) on the pathophysiology of the acute inflammatory reaction in Nile tilapia, Oreochromis niloticus, correlating hepatic functionality with cellular accumulation kinetics in infectious aerocystitis. Eighty- four Nile tilapia were distributed into four treatments: control, CCl4, DEX and CCl4 + DEX. Seven tilapia were sampled per treatment in three periods: 6, 24 and 48h after induction of inflammation. CCl4 was used in a single dose of 0.5mL/kg intraperitoneally to cause hepatic disorder. Aeromonas hydrophila inoculum was used to induce aerocystitis. Dexamethasone was administered intramuscularly at the dose of 2mg/kg b. w. The results revealed a higher serum aspartate transaminase (AST) activity associated with greater somatic liver alteration, being these findings inversely proportional to the cellular accumulation in the inflammatory focus, demonstrating a lower number of inflammatory cells in the animals affected with a higher degree of hepatic disorders induced by CCl4. The histopathological study revealed transient degenerative changes in the most acute phase, as livers of tilapia showed accumulation of lipids in hepatocytes 6 hours after administration of CCl4, and this fatty degeneration was no longer observed in 24 and 48h. However, administration of CCl4 in Nile tilapia resulted in acute and transient liver degeneration, characterized by accumulation of fat in hepatocytes, increased AST in the blood and hepatomegaly. With liver dysfunction there was compromise of cellular recruitment in infectious aerocystitis, indicating that there is liver involvement in the innate immune response in tilapia.

Made available in DSpace on 2022-04-28T19:00:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-01-01 Dermatophytes are fungi that cause superficial mycoses in animals and humans. Infection can occur through direct contact with spores or hyphae of contaminated material. Studies in asymptomatic domestic cats have demonstrated the presence of dermatophytes which make them significant source of infection for other animals and humans that aspect is not well studied in wild felines. This study aimed to determine the presence of dermatophytes on the haircoat of health wild felids kept in captivity in Screening Center for Wild Animals in Sao Luis City, Maranhao State, Brazil. Hair samples of 13 adults wild felines were collected, seven Leopardus trigrinus (5 males and 2 females), one Leopardus wiedii (female) and five Leopardus pardalis (2 males and 3 females) and seeded by printing on Sabouraud dextrose agar plates supplemented with chloramphenicol 0.5 g L-1 cycloheximide and 0.4 g L-1 at 25°C with daily observation for 15 days. For the analysis of reproductive forms were stained with Giemsa for 35 min. In cultures was isolated: Microsporum canis, Trichophyton mentagrophytes and Epidermophyton floccosum. The occurrence of dermatophytes on the haircoat of healthy wild felids kept in captivity, confirms its status as asymptomatic carriers and characterizes them as sources of infection for other animals including humans. Department of Veterinary Pathology, Sao Paulo State University Department of Veterinary Pathology, Maranhao State University Department of Veterinary Pathology, Sao Paulo State University