title: Effect of pure erythropoietin on DNA-synthesis by human marrow day 15 erythroid burst forming units in short-term liquid culture.
abstract: The effect of pure erythropoietin (EP) on human marrow day 15 burst-forming units-erythroid (BFU-E) was studied using a short-term liquid culture system containing 30% human serum. Non-adherent marrow cells were cultured in liquid medium for 0-48 h and then the number of BFU-E was assayed by the use of the plasma clot method. The addition of 1 U/ml of EP into the liquid culture medium resulted in maintenance of the number of BFU-E assayed after 24-48 h of incubation. The number of BFU-E recovered after 24-48 h culture was directly proportional to the concentration of EP present in the liquid medium. In addition, the proliferative status of BFU-E before and after exposure to EP was studied by 3H-thymidine and hydroxyurea suicide. It was found that EP doubles the percentage of BFU-E in DNA synthesis after 24-48 h of incubation in the liquid medium. This effect of EP on DNA synthesis by bone marrow day 15 BFU-E is detectable as early as 6 h after the onset of incubation and at EP concentrations as low as 0.2 U/ml of medium, a concentration present in the serum of moderately anaemic patients. The human marrow day 15 BFU-E is an EP-responsive cell and pure EP can induce it into DNA synthesis.
mesh_terms: D000328:Adult; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D004247:DNA / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D004921:Erythropoietin / Q000494:pharmacology*; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D013997:Time Factors
chemical_list: D004921:Erythropoietin; D004247:DNA