Effect of human plasmalipoproteins on erythropoietic progenitor cells in serum-free cultures.
The purpose of the present study was to investigate the influence of human lipoproteins on CFU-e and BFU-e proliferation from human bone marrow in a serum-free system. In our previously described miniaturized agar system the main lipoprotein-density-classes from human plasma, namely very low density lipoproteins (VLDL), intermediate density lipoproteins (IDL), low density lipoproteins (LDL), high density lipoproteins2 (HDL2) and HDL3 and a mixture of all the five lipoproteins were added in rising concentrations (from 1/10 to normal human plasma concentration) to serum-free medium containing delipidated and deionized bovine serum albumin (BSA), iron saturated transferrin and erythropoietin. The results demonstrate that all lipoproteins markedly increased the CFU-e and BFU-e proliferation after 7 and 14 days of incubation, respectively. Moreover, the lipoproteins induced a shift towards a lower threshold concentration of erythropoietin. Serumlike conditions were obtained if LDL and the mixture of lipoproteins were added to serum-free medium. Furthermore, in the serum-free cultures a maturation to the mature erythrocyte could be found.
D000362:Agar; D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D004912:Erythrocytes / Q000166:cytology*; D004921:Erythropoietin / Q000276:immunology / Q000494:pharmacology; D006801:Humans; D008074:Lipoproteins / Q000494:pharmacology*; D008075:Lipoproteins, HDL / Q000494:pharmacology; D008077:Lipoproteins, LDL / Q000494:pharmacology; D008079:Lipoproteins, VLDL / Q000494:pharmacology; D013234:Stem Cells / Q000187:drug effects*
D003470:Culture Media; D008074:Lipoproteins; D008075:Lipoproteins, HDL; D008077:Lipoproteins, LDL; D008079:Lipoproteins, VLDL; D004921:Erythropoietin; D000362:Agar