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Type: Artigo de periódico
Title: Myelopoietic response in mice exposed to acute cold/restraint stress: Modulation by Chlorella vulgaris prophylactic treatment
Author: Queiroz, JD
Malacrida, SA
Justo, GZ
Queiroz, MLS
Abstract: In this study, hematopoietic cells from mice pretreated with CVE and exposed to acute cold/restraint stress were stimulated in the presence of growth factors to form colonies, thus providing accurate information about the modulation of the green algae of the stress-induced changes in the hematopoietic response. Our results demonstrated that exposure to acute stress affected hematopoiesis. Mice exposed for a 2.5-hour time period of cold and restraint presented diminished clonal capacity for CFU-GM content per femur, which was decreased by as much as 50% compared with that in control mice, in spite of the significant increase in serum colony-stimulating activity (CSA). Treatment with 50 mg/kg CVE for 5 days, previously to the stress regimen, attenuates the effects of the stress, since comparable levels of myeloid progenitors were found in the bone marrow of both CVE/stress and control mice. Moreover, the sera from stressed mice pretreated with CVE further increased the CFU-GM formation. On the contrary, the spleen seemed to be less sensitive to acute stress in our experimental conditions. These findings are in line with our previous reports showing that the stress-induced reduction in bone marrow CFU-GM of rats exposed to electric shocks is mediated by activation of the HPA axis and by secretion of opioid agonists.([14,15]) No changes were observed in bone marrow, spleen and thymus total cell counts, and in relative organ weights. However, a 50% reduction in the body weight loss produced by the stress was observed in mice given the extract.
Subject: myelopoiesis
Chlorella vulgaris
acute cold/restraint stress
CFU-GM (colony-forming unit-granulocyte-macrophage)
Country: Inglaterra
Editor: Informa Healthcare
Rights: fechado
Identifier DOI: 10.1081/IPH-200026914
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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