Effects of grandisin on hematopoietic system, in mice / Efeitos da grandisina sobre o sistema hematopoético, em camundongos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Virola surinamensis, also known as ucuuba branca, is widespread in the Amazon forest and, popularly, used in the treatment of erysipelas, colic and dyspepsia. Experimental studies have shown antiparasitic activities of different components of the plant against Schistosoma mansoni, Plasmodium falciparum, Leishmania donovani and Trypanosoma cruzi. The potential pharmacological use of the plant points towards the need to evaluate the possible effects on the hematopoietic system. The present work aims to verify the effects of grandisin, a lignan extracted from Virola surinamensis, on the hematopoietic system of mice. The following parameters were evaluated: the number of erythrocytes, leukocytes and platelets on peripheral blood, cell counts on bone marrow and spleen (with Neubauer chamber); differential leukocyte count on peripheral blood and bone marrow (on smears stained with May-Grünwald/Giemsa); the characterization of lymphocytes on bone marrow and spleen (by immunocytochemistry). The grandisin in a single dose of 100?g/g of body weight induced, on peripheral blood, significant decrease in the total count of leukocytes, lymphocytes and neutrophils, after 7 and 14 days and a significant decrease in the number of monocytes, after 14 days of treatment. A tendency in the increase of nucleated bone marrow cells occurred after 7 days of administration of the substance, with a significant increase after 14 days of treatment, but no alteration in the spleen cells occurred. An increase in the cells of lymphocytic and monocytic lineages was observed in evolution, in bone marrow after 7 and 14 days of treatment whereas in peripheral blood the number of lymphocytes and monocytes maintained low. Grandisin, administered during five consecutive days with a daily dose of 100?g/g of body weight, caused a decrease in the number of leukocytes, lymphocytes, monocytes and neutrophils in peripheral blood after 7 days of treatment. A tendency of decrease in the number of leukocytes, lymphocytes and monocytes occurred with a significant decrease in the number of neutrophils, after 14 days of administration of the substance. The number of bone marrow cells decreased after 7 and 14 days of treatment. For the spleen cells no alterations were observed. A decrease in the number of mononuclear and polimorfonuclear cells in evolution on bone marrow after 7 and 14 days of treatment was observed. In a single dose experiment, the immunocytochemistry of medullar sediments showed a tendency of decrease in the total number of T lymphocytes, T immature lymphocytes and B lymphocytes after 14 days of treatment. The serial dose caused a decrease in the population of lymphocytes after 7 and 14 days of treatment in bone marrow. The results obtained in this study demonstrated that the dose of 100?g/g of body weight, either in single or in serial doses, cause important alterations on blood cells indicating that for therapeutic use inferior doses must be evaluated.

ASSUNTO(S)

grandisina virola surinamensis virola surinamensis leukocytes grandisin leucócitos

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