Epo-induced erythroid maturation is dependent on Plcγ1 signaling

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Item Type:	Article
Title:	Epo-induced erythroid maturation is dependent on Plcγ1 signaling
Creators Name:	Schnöder, T.M., Arreba-Tutusaus, P., Griehl, I., Bullinger, L., Buschbeck, M., Lane, S.W., Döhner, K., Plass, C., Lipka, D.B., Heidel, F.H. and Fischer, T.
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.
Keywords:	Apoptosis, Cell Cycle, Cell Differentiation, Cell Proliferation, Cultured Cells, DNA Methylation, Erythroblasts, Erythroid Cells, Erythropoiesis, Erythropoietin Receptors, Gene Expression Profiling, High-Throughput Nucleotide Sequencing, Histones, Immunoprecipitation, Janus Kinase 2, Phospholipase C gamma, Real-Time Polymerase Chain Reaction, STAT5 Transcription Factor, Animals, Mice
Source:	Cell Death and Differentiation
ISSN:	1350-9047
Publisher:	Nature Publishing Group
Volume:	22
Number:	6
Page Range:	974-985
Date:	June 2015
Additional Information:	Copyright © 2015 Macmillan Publishers Limited
Official Publication:	https://doi.org/10.1038/cdd.2014.186
External Fulltext:	View full text on PubMed Central
PubMed:	View item in PubMed

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