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Embryonic heart induction.

Ann C Foley1, Ruchika W Gupta, Rosa M Guzzo

  • 1The Burnham Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037, USA.

Annals of the New York Academy of Sciences
|November 30, 2006
PubMed
Summary
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Two embryonic signaling pathways, Dickkopf1 (Dkk1) and Nodal, induce heart tissue development. These pathways act indirectly on endoderm to promote cardiogenesis in adjacent mesoderm.

Area of Science:

  • Developmental Biology
  • Molecular Signaling
  • Cardiogenesis

Background:

  • Embryonic heart development relies on intricate signaling pathways.
  • Understanding the molecular mechanisms initiating cardiogenesis is crucial.

Purpose of the Study:

  • To characterize two distinct signaling pathways, Dickkopf1 (Dkk1) and Nodal, involved in embryonic heart induction.
  • To elucidate the roles of Dkk1 and Nodal in regulating cardiogenesis through endodermal signaling.

Main Methods:

  • Investigated the effects of Wnt antagonist Dickkopf1 (Dkk1) and its downstream transcription factor Hex.
  • Examined the Nodal signaling pathway and its co-receptor Cripto.
  • Analyzed the indirect inductive mechanisms involving endodermal secretion of signaling factors.

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Main Results:

  • Dkk1 induces cardiogenesis non-autonomously via the transcription factor Hex, potentially through novel activities beyond Wnt antagonism.
  • Nodal signaling acts indirectly by stimulating Cerberus secretion from the endoderm.
  • Both pathways converge on the endoderm to orchestrate the secretion of factors that promote cardiomyocyte differentiation in adjacent mesoderm.

Conclusions:

  • Dkk1 and Nodal signaling pathways are critical for initiating and progressing embryonic heart development.
  • These pathways regulate cardiogenesis through cell-non-autonomous mechanisms involving endodermal signaling.
  • Dkk1 possesses novel activities essential for later stages of cardiomyocyte differentiation and myocardial tissue organization.