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. 1997 Jan 15;16(2):267–280. doi: 10.1093/emboj/16.2.267

The glucocorticoid receptor is a key regulator of the decision between self-renewal and differentiation in erythroid progenitors.

O Wessely 1, E M Deiner 1, H Beug 1, M von Lindern 1
PMCID: PMC1169634  PMID: 9029148

Abstract

During development and in regenerating tissues such as the bone marrow, progenitor cells constantly need to make decisions between proliferation and differentiation. We have used a model system, normal erythroid progenitors of the chicken, to determine the molecular players involved in making this decision. The molecules identified comprised receptor tyrosine kinases (c-Kit and c-ErbB) and members of the nuclear hormone receptor superfamily (thyroid hormone receptor and estrogen receptor). Here we identify the glucocorticoid receptor (GR) as a key regulator of erythroid progenitor self-renewal (i.e. continuous proliferation in the absence of differentiation). In media lacking a GR ligand or containing a GR antagonist, erythroid progenitors failed to self-renew, even if c-Kit, c-ErbB and the estrogen receptor were activated simultaneously. To induce self-renewal, the GR required the continuous presence of an activated receptor tyrosine kinase and had to cooperate with the estrogen receptor for full activity. Mutant analysis showed that DNA binding and a functional AF-2 transactivation domain are required for proliferation stimulation and differentiation arrest. c-myb was identified as a potential target gene of the GR in erythroblasts. It could be demonstrated that delta c-Myb, an activated c-Myb protein, can functionally replace the GR.

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Selected References

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