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Original Research

Regulated Expression and Role of c-Myb in the Cardiovascular-Directed Differentiation of Mouse Embryonic Stem Cells

Masayoshi Ishida, Omar El-Mounayri, Steven Kattman, Peter Zandstra, Hiroshi Sakamoto, Minetaro Ogawa, Gordon Keller, Mansoor Husain
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https://doi.org/10.1161/CIRCRESAHA.111.259499
Circulation Research. 2011;CIRCRESAHA.111.259499
Originally published November 23, 2011
Masayoshi Ishida
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Omar El-Mounayri
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Steven Kattman
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Peter Zandstra
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Hiroshi Sakamoto
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Minetaro Ogawa
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Gordon Keller
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Mansoor Husain
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Abstract

Rationale: c-myb null (knockout) embryonic stem cells (ESC) can differentiate into cardiomyocytes but not contractile smooth muscle cells (SMC) in embryoid bodies (EB).

Objective: To define the role of c-Myb in SMC differentiation from ESC.

Methods and Results: In wild-type (WT) EB, high c-Myb levels on days 0–2 of differentiation undergo ubiquitin-mediated proteosomal degradation on days 2.5–3, resurging on days 4–6, without changing c-myb mRNA levels. Activin-A and bone morphogenetic protein 4–induced cardiovascular progenitors were isolated by FACS for expression of vascular endothelial growth factor receptor (VEGFR)2 and platelet-derived growth factor receptor (PDGFR)α. By day 3.75, hematopoesis-capable VEGFR2+ cells were fewer, whereas cardiomyocyte-directed VEGFR2+/PDGFRα+ cells did not differ in abundance in knockout versus WT EB. Importantly, highest and lowest levels of c-Myb were observed in VEGFR2+ and VEGFR2+/PDGFRα+ cells, respectively. Proteosome inhibitor MG132 and lentiviruses enabling inducible expression or knockdown of c-myb were used to regulate c-Myb in WT and knockout EB. These experiments showed that c-Myb promotes expression of VEGFR2 over PDGFRα, with chromatin immunopreciptation and promoter-reporter assays defining specific c-Myb–responsive binding sites in the VEGFR2 promoter. Next, FACS-sorted VEGFR2+ cells expressed highest and lowest levels of SMC- and fibroblast-specific markers, respectively, at days 7–14 after retinoic acid as compared with VEGFR2+/PDGFRα+ cells. By contrast, VEGFR2+/PDGFRα+ cells cultured without RA beat spontaneously, like cardiomyocytes between days 7 and 14, and expressed cardiac troponin. Notably, retinoic acid was required to more fully differentiate SMC from VEGFR2+ cells and completely blocked differentiation of cardiomyocytes from VEGFR2+/PDGFRα+ cells.

Conclusions: c-Myb is tightly regulated by proteosomal degradation during cardiovascular-directed differentiation of ESC, expanding early-stage VEGFR2+ progenitors capable of retinoic acid–responsive SMC formation.

  • cardiac progenitor cells
  • embryonic stem cells
  • smooth muscle differentiation
  • transcription factors
  • Received October 27, 2011.
  • Revision received October 27, 2011.
  • Accepted November 15, 2011.
  • © 2011 American Heart Association, Inc.
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    Regulated Expression and Role of c-Myb in the Cardiovascular-Directed Differentiation of Mouse Embryonic Stem Cells
    Masayoshi Ishida, Omar El-Mounayri, Steven Kattman, Peter Zandstra, Hiroshi Sakamoto, Minetaro Ogawa, Gordon Keller and Mansoor Husain
    Circulation Research. 2011;CIRCRESAHA.111.259499, originally published November 23, 2011
    https://doi.org/10.1161/CIRCRESAHA.111.259499

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    Regulated Expression and Role of c-Myb in the Cardiovascular-Directed Differentiation of Mouse Embryonic Stem Cells
    Masayoshi Ishida, Omar El-Mounayri, Steven Kattman, Peter Zandstra, Hiroshi Sakamoto, Minetaro Ogawa, Gordon Keller and Mansoor Husain
    Circulation Research. 2011;CIRCRESAHA.111.259499, originally published November 23, 2011
    https://doi.org/10.1161/CIRCRESAHA.111.259499
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