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JA Ortega, NA Shore, PP Dukes and D Hammond
Division of Hematology-Oncology, Childrens Hospital of Los Angeles, Calif.
90027.
An in vitro marrow culture assay designed to measure erythropoietic
capability was used to ascertain the presence of an inhibitor in the sera
of patients with congenital hypoplastic anemia (CHA). Marrow cells from
nine anemic CHA patients responded to the stimulatory effect of exogenous
erythropoietin (EPO) by an increase in heme synthesis in the presence of
normal serum. The effect on heme synthesis was less than that observed with
normal marrow cells. CHA serum inhibited heme synthesis by both normal and
CHA marrow cells. It is concluded that an in-inhibitor of erythropoiesis is
present in serum from CHA patients. This inhibitor most likely blocks the
EPO-sensitive stem cell receptor sites, causing decreased response to the
hormone.
This article has been cited by other articles:
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| Copyright © 1975 by American Society of Hematology Online ISSN: 1528-0020 | |||||||||