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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Altered levels of cytokines and inflammatory mediators in plasma and leukocytes of sickle cell anemia patients and effects of hydroxyurea therapy

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Lanaro, C. ; Franco-Penteado, C. F. ; Albuqueque, D. M. ; Saad, S. T. O. ; Conran, N. ; Costa, F. F. [1]
Total Authors: 6
[1] Univ Estadual Campinas, Fac Ciencias Med, Sch Med, Hematol & Hemotherapy Ctr, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Leukocyte Biology; v. 85, n. 2, p. 235-242, Feb. 2009.
Field of knowledge: Biological Sciences - Pharmacology
Web of Science Citations: 93

Inflammation, cell adhesion to vascular endothelium, and endothelial injury contribute to sickle cell anemia (SCA) vaso-occlusion. Although alterations in inflammatory cytokines and biomarkers have been related, reports have been conflicting, and a conclusive role for these molecules in the disease remains to be established. Furthermore, the effect of hydroxyurea therapy (HU) on the release of inflammatory mediators is not understood. This study aimed to determine plasma levels and leukocyte gene expressions of inflammatory mediators in healthy controls, steady-state SCA patients, and SCA patients on HU therapy. TNF-alpha, IL-8, and PGE(2) levels were significantly higher in the plasma of SCA individuals when compared with control individuals. HU therapy was associated with a significant reversal of augmented TNF-alpha and, interestingly, increased plasma anti-inflammatory IL-10. IFN-gamma, IL-10, cyclooxygenase 2 (COX-2), and inducible NO synthase (iNOS) gene expressions were unaltered in SCA mononuclear cells (MC); however, gene expressions of TNF-alpha, IL-8, and the protective enzyme heme oxygenase-1 (HO-1) were significantly higher. HU therapy was not associated with significantly altered SCA MC inflammatory gene expression, although COX-2 mRNA expression was decreased. In SCA neutrophils, gene expressions of IL-8, IFN-gamma, iNOS, and HO-1 were significantly higher than those of control subjects. Patients on HU demonstrated lower iNOS and higher IL-10 neutrophil gene expressions. Taken together, data suggest that alterations in the gene expressions and productions of a number of pro- and anti-inflammatory mediators are present in SCA and importantly, in those patients on HU therapy. Knowledge of these pathways may contribute to further the understanding of the pathophysiology of this disease. (AU)

FAPESP's process: 07/50853-9 - Investigation of adhesive properties and signaling pathways of neutrophils and platelets and their role in inflammatory diseases
Grantee:Nicola Amanda Conran Zorzetto
Support type: Regular Research Grants
FAPESP's process: 08/57895-1 - National Institute of Blood Technology and Science
Grantee:Sara Teresinha Olalla Saad
Support type: Research Projects - Thematic Grants
FAPESP's process: 07/54870-5 - Functional characterization of the protein and its role in cellular proliferation and leukemogenesis
Grantee:Sara Teresinha Olalla Saad
Support type: Regular Research Grants