Emprego do Hamster sírio (Mesocricetus auratus) como modelo biológico para a indução de portador renal de leptospiras / The use of sirius hamster (Mesocricetus Auratus) as a biological model for inducing kidney carrier of leptospirosis

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The use of hamsters (Mesocricetus auratus) as experimental model for the reproduction of leptospires kidney carrier condition was investigated on youngs males and females with 80 to 120 g of living weight. The animals were experimentally infected with pathogenic strain of serovar Pomona able of causing the death by leptospirosis between the fifth and the tenth post-infection day. On the second day post-infection the animals were treated with erythromycin estolate at the concentrations of 10, 20, 40 and 80 mg/ kg of living weight. At the 30th day of experimental infection the survivors were anesthetized with isoflurane and blood sample were collected for the determination of kidney and liver functions (Total proteins, Albumin, Urea, Creatinine, Alkaline Phosphatase, Alanine Aminotransferase, Aspartate Aminotransferase, Indirect Bilirubins, Direct Bilirubins and Total Bilirubins), and the of agglutinine title by the microscopic agglutination test (MAT). The animals were killed whit the reinforcement of the anesthesis, and necropsied for the collection of kidney and liver sample for histopathologic tests by staining of Hematoxylin-Eosina and Warthin-Starry, such as the isolation of leptospiras by cultivation into Fletcher´s medium. There were controls of the infecctious inoculum, antibiotic treatment and of the management system adopted. The number of DL 50 effectively applied in the infectious inoculum was 7,11. The antibiotic controls presented elevation of the alkaline phosphatase level and vacuolar degeneration of hepatocytes at the concentrations of 40 to 80 mg of antibiotic. The leptospires kidney carriers were obtained in the animals treated with 40 or 80 mg of Erythromycin Estolate, regardless of the sex; these animals showed increase in creatinines and total protein serum levels but of albumin, urea, alanine aminotransferase, aspartate aminotransferase, direct bilirubins, indirect bilirubins and total bilirubins were the same as found in animals not infected by leptospires and not treated with the antibiotic. The histological changes found in the animals induced as leptospires carrier were vacuolar degeneration in hepatocytes, blood in the portal tract, and glomerular congestion. The agglutinine titles for the homologous serovar, expressed on base 10 logarithm, were at least 1.19.

ASSUNTO(S)

leptospirose portador renal kidney and liver histopathology kidney carrier leptospirosis bioquímica renal e hepática histopatologia do portador renal hamster kidney and liver biochemistry hamster

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