title: Effects of shortened erythropoietin exposure on sheep marrow cultures.
abstract: To determine whether erythropoietin (Ep) is required only to trigger, or also to sustain the growth of erythroid progenitor (CFU-E) in vitro, the effect of limiting the time of exposure of sheep bone marrow CFU-E to Ep on erythroid colony (EC) formation was examined. Restricting the in vitro exposure of CFU-E to 2-24 h, either by brief preincubation with Ep or by neutralization of Ep present in culture with anti-Ep, resulted in a 70-90% reduction of EC formation, and the colonies that were produced were of a small size. In contrast, no inhibition of EC size or number occurred when CFU-E were exposed to EP for more than 24 h. These results suggest that Ep also modulates the proliferative events subsequent to the initial triggering of CFU-E which lead to the formation of erythrocytes.
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D004912:Erythrocytes / Q000187:drug effects; D004921:Erythropoietin / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D005260:Female; D006412:Hematopoietic Stem Cells / Q000187:drug effects*; D012756:Sheep; D013997:Time Factors
chemical_list: D004921:Erythropoietin