Cell autonomous requirement of endocardial Smad4 during atrioventricular cushion development in mouse embryos

Langying Song, Mei Zhao, Bingruo Wu, Bin Zhou, Qin Wang, Kai Jiao

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Atrioventricular (AV) cushions are the precursors of AV septum and valves. In this study, we examined roles of Smad4 during AV cushion development using a conditional gene inactivation approach. We found that endothelial/endocardial inactivation of Smad4 led to the hypocellular AV cushion defect and that both reduced cell proliferation and increased apoptosis contributed to the defect. Expression of multiple genes critical for cushion development was down-regulated in mutant embryos. In collagen gel assays, the number of mesenchymal cells formed is significantly reduced in mutant AV explants compared to that in control explants, suggesting that the reduction of cushion mesenchyme formation in mutants is unlikely secondary to their gross vasculature abnormalities. Using a previously developed immortal endocardial cell line, we showed that Smad4 is required for BMP signaling- stimulated upregulation of Tbx20 and Gata4. Therefore, our data collectively support the cell-autonomous requirement of endocardial Smad4 in regulating AV cushion development.

Original languageEnglish (US)
Pages (from-to)211-220
Number of pages10
JournalDevelopmental Dynamics
Volume240
Issue number1
DOIs
StatePublished - Jan 2011

Fingerprint

Gene Silencing
Mesoderm
Up-Regulation
Collagen
Embryonic Structures
Cell Count
Gels
Cell Proliferation
Apoptosis
Gene Expression
Cell Line

Keywords

  • Atrioventricular cushion
  • BMP
  • Congenital heart disease
  • Smad4
  • Valvulogenesis

ASJC Scopus subject areas

  • Developmental Biology

Cite this

Cell autonomous requirement of endocardial Smad4 during atrioventricular cushion development in mouse embryos. / Song, Langying; Zhao, Mei; Wu, Bingruo; Zhou, Bin; Wang, Qin; Jiao, Kai.

In: Developmental Dynamics, Vol. 240, No. 1, 01.2011, p. 211-220.

Research output: Contribution to journalArticle

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