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- W1724131118 abstract "Human leukemia K562(S) cells were induced to differentiate by 50 microM hemin or 1.4 mM butyric acid, and the types of hemoglobins synthesized were compared. In both cases, embryonal hemoglobins [Portland, Gower 1, Hb X, and fetal hemoglobin (Hb-F)] were detected. Butyric acid-treated K562(S) cells contained mostly Hb Gower 1 (zeta 2 epsilon 2) and a hemoglobin with the electrophoretic characteristics of Portland (gamma 2 zeta 2). For hemin-treated K562(S), the most abundant hemoglobin synthesized by Hb X (epsilon 2 gamma 2), and the second most abundant was Bart's (gamma 4). Traces of Gower 1 were observed in nontreated K562(S) cells. The kinetics of hemoglobin induction as a result of the two treatments differed; increased hemoglobin synthesis was detected after only 24 hr of hemin treatment, whereas 4 days were required in butyric acid-treated cells. Both hemin and butyric acid were able to induce their respective patterns of hemoglobin synthesis independent of the presence of serum in the K562(S) growth medium. Analysis of the globin chains in induced K562(S) cells induced to differentiate indicated that, with both inducers, adult alpha- but not beta-globin chains were present. Karyotype analysis of K562(S) cells revealed a nearly triploid chromosome complement with a modal number of 68 chromosomes. Three copies of chromosome 11 and four copies of chromosome 16 (coding for the beta-like and alpha-like globin genes, respectively) were present. A large marked chromosome, involving chromosome 7, and a Philadelphia chromosome were also seen. These data characterize the K562(S) subline and also indicate that hemin and butyric acid differ in their effects on the expression of embryonal globin genes." @default.
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- W1724131118 date "1981-01-01" @default.
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- W1724131118 title "Differential expression of the globin genes in human leukemia K562(S) cells induced to differentiate by hemin or butyric acid." @default.
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