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IJ Ballart, ME Estevez, L Sen, RA Diez, J Giuntoli, SA de Miani and J Penalver
We evaluated phagocytic and lytic activities of peripheral blood monocytes
(PBMo) from patients with thalassemia major (ThP) using C pseudotropicalis
as the target. PBMo from ThP showed decreased lytic activity (P less than
.001), whereas the phagocytic activity did not differ from that of the
controls. Significant inverse correlations were found between lytic
activity of PBMo and age of patients (r2 = .47; P less than .01) and also
between lytic activity and serum ferritin levels (r2 = .65; P less than
.001). No association was found between lytic activity and other variables
(blood transfusion regimens, therapy with desferrioxamine, liver damage,
and the presence of sHBAg). Splenectomy showed no positive effect on PBMo
functions from ThP. Our results suggest that PBMo from ThP have an
intracellular defect in their microbicidal mechanisms associated with iron
overload. This cell dysfunction could be responsible, at least in part, for
the increased susceptibility to infections reported in ThP.
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| Copyright © 1986 by American Society of Hematology Online ISSN: 1528-0020 | |||||||||