Efeitos do extrato hidroalcoolico de Tabebula avellanedae sobre a resposta hematopoetica em camundongos infectados com Listeria monocytogenes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In this work, we ivestigated the effects of Tabebuia avellanedae extract (TAHE) on the growth and differentiation ofbone marrow and spleen hematopoietic progenitors in Listeria monocytogenes infected mice. Serum colony stimulating activity, weight changes of spleen and resistance ofthe animaIs as they faced infection were also evaluated. For a period of 7 days BALB/c mice were treated daily with 125, 250, 500 and 1O00mgIKg/day ofTAHE by gavage. At the end of this period, the animaIs were infected intraperitoneal1y with a subletal dose (4x104 bacteria/animal) and sacrificed 24, 48 or 72 hours after infection. Our results demonstrated a significant decrease on the number of bone marrow hematopoietic progenitors in Listeria monocytogenes infected mice at 48 and 72 hours after infection when compared with compared with control. Moreover, extramedular hematopoiesis was also observed in the infected group at 48 and 72 hours after infection. However, when these animais were treated with TAHE (125, 250 and 500mgIK.g), the myelossupressive effects produced by infection were reverted, resulting in normallevels of CFU-GM. Regarding the production of colony-stimulating factor, we observed that serum from infected animaIs presented a higher stimulatory activity on the CFU-GM generation. Treatment of infected groups with T AHE significant1y increased the serum colony­stimulating activity, since in the CFU-GM number was induced in relation to the only infected groups. In contrast to the increased spleen weight found in infected animals, T AHE-treated mice presented normal spleen weights. Treatment with TAHE (125, 250 and 500 mglKg) also increased resistence of infected animaIs, as 15, 30 and 30 % ofsurvivors were obtained in these groups, respectively

ASSUNTO(S)

listeria medula ossea baço

ACESSO AO ARTIGO

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