Regulation of Primitive Hematopoiesis by Class I Histone Deacetylases

Authors

  • Rishita R. Shah,

    1. Cell and Molecular Biology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania
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  • Anne Koniski,

    1. Department of Pediatrics, Center for Pediatric Biomedical Research, University of Rochester Medical Center, New York
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  • Mansi Shinde,

    1. Pharmacology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania
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  • Shelby A. Blythe,

    1. Cell and Molecular Biology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania
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  • Daniel M. Fass,

    1. Stanley Center for Psychiatric Research, Broad Institute of Harvard and MIT, Cambridge, Massachusetts
    2. Center for Human Genetic Research, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
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  • Stephen J. Haggarty,

    1. Stanley Center for Psychiatric Research, Broad Institute of Harvard and MIT, Cambridge, Massachusetts
    2. Center for Human Genetic Research, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
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  • James Palis,

    1. Department of Pediatrics, Center for Pediatric Biomedical Research, University of Rochester Medical Center, New York
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  • Peter S. Klein

    Corresponding author
    1. Pharmacology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania
    2. Department of Medicine (Hematology/Oncology), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
    • Cell and Molecular Biology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania
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Correspondence to: Peter S. Klein, Department of Medicine (Hematology/Oncology), University of Pennsylvania, Philadelphia, PA 19104. E-mail: pklein@mail.med.upenn.edu

Abstract

Background: Histone deacetylases (HDACs) regulate multiple developmental processes and cellular functions. However, their roles in blood development have not been determined, and in Xenopus laevis a specific function for HDACs has yet to be identified. Here, we employed the class I selective HDAC inhibitor, valproic acid (VPA), to show that HDAC activity is required for primitive hematopoiesis. Results: VPA treatment during gastrulation resulted in a complete absence of red blood cells (RBCs) in Xenopus tadpoles, but did not affect development of other mesodermal tissues, including myeloid and endothelial lineages. These effects of VPA were mimicked by Trichostatin A (TSA), a well-established pan-HDAC inhibitor, but not by valpromide, which is structurally similar to VPA but does not inhibit HDACs. VPA also caused a marked, dose-dependent loss of primitive erythroid progenitors in mouse yolk sac explants at clinically relevant concentrations. In addition, VPA treatment inhibited erythropoietic development downstream of bmp4 and gata1 in Xenopus ectodermal explants. Conclusions: These findings suggest an important role for class I HDACs in primitive hematopoiesis. Our work also demonstrates that specific developmental defects associated with exposure to VPA, a significant teratogen in humans, arise through inhibition of class I HDACs. Developmental Dynamics 242:108–121, 2013. © 2012 Wiley Periodicals,Inc.

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