Influence of cell cycle phase-specific agents on simian fetal hemoglobin synthesis

Abstract

The results establish several important features of the fetal hemoglobin response to cytotoxic agents in the primate model. The response requires accelerated erythropoiesis and is preceded by transient reticulocytopenia. The response is produced by S phase- and M phase-specific agents when given in sufficient doses and at appropriate schedules. Passage of erythrocyte progenitors through M phase appears to be necessary for expression of the effect produced by S phase agents. The fetal hemoglobin reponse induced by cytotoxic drug administration occurs during the recovery of erythropoiesis following marrow suppression.