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Cell Death Differ. 2015 Jun;22(6):974-85. doi: 10.1038/cdd.2014.186. Epub 2014 Nov 14.

Epo-induced erythroid maturation is dependent on Plcγ1 signaling.

Author information

1
Department of Hematology and Oncology, Center for Internal Medicine, Otto-von-Guericke University Medical Center, Magdeburg, Germany.
2
Internal Medicine III, Department of Hematology/Oncology, University Hospital Ulm, Ulm, Germany.
3
Institute of Predictive and Personalized Medicine of Cancer (IMPPC), Campus Can Ruti, Badalona, Spain.
4
Division of Immunology, QIMR Berghofer Medical Research Institute, Herston, Brisbane, Australia.
5
Division of Epigenomics and Cancer Risk Factors (C010), German Cancer Research Center, Heidelberg, Germany.
6
1] Department of Hematology and Oncology, Center for Internal Medicine, Otto-von-Guericke University Medical Center, Magdeburg, Germany [2] Division of Epigenomics and Cancer Risk Factors (C010), German Cancer Research Center, Heidelberg, Germany.

Abstract

Erythropoiesis is a tightly regulated process. Development of red blood cells occurs through differentiation of hematopoietic stem cells (HSCs) into more committed progenitors and finally into erythrocytes. Binding of erythropoietin (Epo) to its receptor (EpoR) is required for erythropoiesis as it promotes survival and late maturation of erythroid progenitors. In vivo and in vitro studies have highlighted the requirement of EpoR signaling through Janus kinase 2 (Jak2) tyrosine kinase and Stat5a/b as a central pathway. Here, we demonstrate that phospholipase C gamma 1 (Plcγ1) is activated downstream of EpoR-Jak2 independently of Stat5. Plcγ1-deficient pro-erythroblasts and erythroid progenitors exhibited strong impairment in differentiation and colony-forming potential. In vivo, suppression of Plcγ1 in immunophenotypically defined HSCs (Lin(-)Sca1(+)KIT(+)CD48(-)CD150(+)) severely reduced erythroid development. To identify Plcγ1 effector molecules involved in regulation of erythroid differentiation, we assessed changes occurring at the global transcriptional and DNA methylation level after inactivation of Plcγ1. The top common downstream effector was H2afy2, which encodes for the histone variant macroH2A2 (mH2A2). Inactivation of mH2A2 expression recapitulated the effects of Plcγ1 depletion on erythroid maturation. Taken together, our findings identify Plcγ1 and its downstream target mH2A2, as a 'non-canonical' Epo signaling pathway essential for erythroid differentiation.

PMID:
25394487
PMCID:
PMC4423181
DOI:
10.1038/cdd.2014.186
[Indexed for MEDLINE]
Free PMC Article

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