Epicardial Spindle Orientation Controls Cell Entry into the Myocardium

Mingfu Wu, Christopher L. Smith, James A. Hall, Ivy Lee, Kate Luby-Phelps, Michelle D. Tallquist

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


During heart morphogenesis, epicardial cells undergo an epithelial-to-mesenchymal transition (EMT) and migrate into the subepicardium. The cellular signals controlling this process are poorly understood. Here, we show that epicardial cells exhibit two distinct mitotic spindle orientations, directed either parallel or perpendicular to the basement membrane. Cells undergoing perpendicular cell division subsequently enter the myocardium. We found that loss of β-catenin led to a disruption of adherens junctions and a randomization of mitotic spindle orientation. Loss of adherens junctions also disrupted Numb localization within epicardial cells, and disruption of Numb and Numblike expression in the epicardium led to randomized mitotic spindle orientations. Taken together, these data suggest that directed mitotic spindle orientation contributes to epicardial EMT and implicate a junctional complex of β-catenin and Numb in the regulation of spindle orientation.

Original languageEnglish (US)
Pages (from-to)114-125
Number of pages12
JournalDevelopmental cell
Issue number1
StatePublished - Jul 2010


  • Cellbio
  • Devbio

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)
  • Developmental Biology
  • Cell Biology


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