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Blood. 2012 Nov 15;120(20):4219-28. doi: 10.1182/blood-2011-10-387050. Epub 2012 Sep 14.

Protein kinase D-HDAC5 signaling regulates erythropoiesis and contributes to erythropoietin cross-talk with GATA1.

Author information

1
Department of Pathology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA. ang3x@virginia.edu

Abstract

In red cell development, the differentiation program directed by the transcriptional regulator GATA1 requires signaling by the cytokine erythropoietin, but the mechanistic basis for this signaling requirement has remained unknown. Here we show that erythropoietin regulates GATA1 through protein kinase D activation, promoting histone deacetylase 5 (HDAC5) dissociation from GATA1, and subsequent GATA1 acetylation. Mice deficient for HDAC5 show resistance to anemic challenge and altered marrow responsiveness to erythropoietin injections. In ex vivo studies, HDAC5(-/-) progenitors display enhanced entry into and passage through the erythroid lineage, as well as evidence of erythropoietin-independent differentiation. These results reveal a molecular pathway that contributes to cytokine regulation of hematopoietic differentiation and offer a potential mechanism for fine tuning of lineage-restricted transcription factors by lineage-specific cytokines.

PMID:
22983445
PMCID:
PMC3501719
DOI:
10.1182/blood-2011-10-387050
[Indexed for MEDLINE]
Free PMC Article
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