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H Saito, K Yamada, J Breard, O Yoshie and G Mathe
EO-1, an IgGl murine monoclonal antibody raised against human eosinophilic
leukemia cells, reacts with eosinophils, basophils, platelets, and a few
(2%) mononuclear cells but not with neutrophils. In the bone marrow, mature
and immature eosinophils and basophils express the EO-1 antigen, whereas
immature myeloid cells do not. The distribution of EO-1 antigen on leukemic
cells is concordant with this finding, ie, typical myeloid lines (HL-60,
KG-1, and ML-1) and fresh acute myelogenous leukemia cells are all
unreactive with EO-1. Immunoprecipitation of an extract from
surface-131I-labeled platelets with EO-1 and sodium dodecyl sulfate
polyacrylamide gel electrophoresis, under reducing or nonreducing
conditions, yielded a specific band of molecular weight 23,000. Previously
described monoclonal antibodies reacting with eosinophils also recognize
neutrophils. EO-1 is a unique antibody with specificity restricted to
eosinophils, basophils, and platelets and might therefore be a valuable
reagent for the study of their function and differentiation.
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