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. 1996 Aug 20;93(17):9126–9131. doi: 10.1073/pnas.93.17.9126

Thrombopoietin rescues in vitro erythroid colony formation from mouse embryos lacking the erythropoietin receptor.

M W Kieran 1, A C Perkins 1, S H Orkin 1, L I Zon 1
PMCID: PMC38606  PMID: 8799165

Abstract

The interaction of the hormone erythropoietin and its receptor (EpoR) is though to be required for normal hematopoiesis. To define the role of EpoR in this process, the murine EpoR was disrupted by homologous recombination. Mice lacking the EpoR died in utero at embryonic day 11-12.5 with severe anemia. Embryonic erythropoiesis was markedly diminished, while fetal liver hematopoiesis was blocked at the proerythroblast stage. Other cell types known to express EpoR, including megakaryocytes, mast, and neural cells were morphologically normal. Reverse transcription-coupled PCR analysis of RNA from embryonic yolk sac, peripheral blood, and fetal liver demonstrated near normal transcripts levels for EKLF, thrombopoietin (Tpo), c-MPL, GATA-1, GATA-2, and alpha- and embryonic beta H1-globin but non for adult beta maj-globin. While colony-forming unit-erythroid (CFU-E) and burst-forming unit-erythroid (BFU-E) colonies were not present in cultures derived from EpoR-/- liver or yolk sac cells, hemoglobin-containing BFU-E colonies were detected in cultures treated with recombinant Tpo and Kit ligand or with Tpo and interleukin 3 and 11. Rescued BFU-E colonies expressed adult beta-globin and c-MPL and appeared morphologically normal. Thus, erythroid progenitors are formed in vivo in mice lacking the EpoR, and our studies demonstrate that a signal transmitted through the Tpo receptor c-MPL stimulates proliferation and terminal differentiation of these progenitors in vitro.

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