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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A multiparameter analysis of sickle erythrocytes in patients undergoing hydroxyurea therapy.

During 24 weeks of hydroxyurea treatment, we monitored red blood cell (RBC) parameters in three patients with sickle cell disease, including F-cell and F-reticulocyte profiles, distributions of delay times for intracellular polymerization, sickle erythrocyte adherence to human umbilical vein endothelial cells in a laminar flow chamber, RBC phthalate density profiles, mean corpuscular hemoglobin concentration and cation content, reticulocyte mean corpuscular hemoglobin concentration, 1H-nuclear magnetic resonance transverse relaxation rates of packed RBCs, and plasma membrane lateral and rotational mobilities of band 3 and glycophorins. Hydroxyurea increases the fraction of cells with sufficiently long delay times to escape the microcirculation before polymerization begins. Furthermore, high pretreatment adherence to human umbilical vein endothelial cells of sickle RBCs decreased to normal after only 2 weeks of hydroxyurea treatment, preceding the increase in fetal hemoglobin levels. The lower adhesion of sickle RBCs to endothelium would facilitate escape from the microcirculation before polymerization begins. Hydroxyurea shifted several biochemical and biophysical parameters of sickle erythrocytes toward values observed with hemoglobin SC disease, suggesting that hydroxyurea moderates sickle cell disease toward the milder, but still clinically significant, hemoglobin SC disease. The 50% reduction in sickle crises documented in the Multicenter Study of Hydroxyurea in Sickle Cell Disease is consistent with this degree of erythrocyte improvement.[1]


  1. A multiparameter analysis of sickle erythrocytes in patients undergoing hydroxyurea therapy. Bridges, K.R., Barabino, G.D., Brugnara, C., Cho, M.R., Christoph, G.W., Dover, G., Ewenstein, B.M., Golan, D.E., Guttmann, C.R., Hofrichter, J., Mulkern, R.V., Zhang, B., Eaton, W.A. Blood (1996) [Pubmed]
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