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. 1979 Mar;76(3):1477–1481. doi: 10.1073/pnas.76.3.1477

Hemoglobin synthesis in cultures of hepatic erythroid cells from the human fetus

Peter T Rowley *,†,‡, Betsy Ohlsson-Wilhelm †, Barbara A Farley §, Barbara Kosciolek §
PMCID: PMC383276  PMID: 286333

Abstract

A recent theory of the control of human fetal hemoglobin synthesis, based on studies in cultured adult marrow, proposes that the phenotypic expression of fetal hemoglobin is largely dependent on the level of differentiation of the parental stem cells; that is, the earlier the progenitor, the greater the ability of its progeny to express fetal hemoglobin [Papayannopoulou, Th., Brice, M. & Stamatoyannopoulos, G. (1977) Proc. Natl. Acad. Sci. USA 74, 2923-2927]. To test this relationship with fetal tissue, we have studied hemoglobin synthesis in cultured human fetal liver, comparing γ chain synthesis in the descendants of the early progenitors (“bursts”) with that in the descendants of the later progenitors (“colonies”). Cells from the livers of midtrimester fetuses were cultured in methylcellulose with erythropoietin. The β/(β + γ) globin synthetic ratio on days 5 to 7, when colonies predominated, was 0.09-0.11, a value characteristic of fetal reticulocytes, and on days 11 and 12, when bursts predominated, was 0.15-0.17. Thus, in fetal liver, the descendants of the earlier progenitor, the burst-forming unit, may be making more β chains rather than more γ chains, compared to descendants of the later progenitor, the colonyforming unit. Our data on fetal liver, taken together with the data on adult marrow by others, suggest that the erythroid colonies express the gene characteristic of the age of the organism to a greater degree than bursts, which express β and γ genes less specifically. Thus, the capacity for highly selective gene expression characteristic of differentiated cells appears to be less well developed in the burst-forming unit than in the colony-forming unit.

Keywords: differentiation, erythropoietin, cell culture, abortus, gene expression

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Selected References

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