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Nkx2-5 suppresses the proliferation of atrial myocytes and conduction system

Yasuhiro Nakashima1, Diana A Yanez, Marlin Touma

  • 1From the Department of Molecular Cell and Developmental Biology (Y.N., D.A.Y., H.N., A.J., M.P., A.N.), Departments of Pediatrics and Molecular Cell and Integrative Physiology, David Geffen School of Medicine (M.T.), Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research (H.N., M.P., A.N.), Department of Physiology, David Geffen School of Medicine (M.C.J., K.P.R.), Molecular Biology Institute (M.P.), Institute of Genomics and Proteomics (M.P.), and Jonsson Comprehensive Cancer Center (A.N.), University of California, Los Angeles, Los Angeles, CA.

Circulation Research
|February 25, 2014
PubMed
Abstract

Insights

NKX2-5 normally suppresses cardiomyocyte proliferation in the developing heart. Its deletion leads to hyperplastic cardiomyocytes and conduction system defects, revealing its critical role in heart development.

Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Genetics

Background:

  • Cardiomyocyte proliferation is crucial for heart formation.
  • NKX2-5 mutations are linked to heart defects, but its role in proliferation is debated.

Purpose of the Study:

  • To investigate the role of NKX2-5 in cardiomyocyte proliferation.
  • To overcome limitations of previous NKX2-5 mutant models.

Main Methods:

  • Generated atrial-restricted Nkx2-5 deletion models.
  • Utilized multicolor reporter analysis and transcriptome analysis.

Main Results:

  • Nkx2-5 deletion caused atrial myocyte and conduction system hyperproliferation.
  • Nkx2-5 suppresses cardiomyocyte proliferation post-ballooning.
  • Aberrant Notch signaling drives hyperproliferation in Nkx2-5 mutants.

Conclusions:

  • NKX2-5 regulates atrial working and conduction cardiomyocyte proliferation.
  • This regulation occurs in coordination with the Notch pathway.
Keywords:
Nkx2-5Notchatrial septal defectatrioventricular blockcongenital cardiac defectinternodal tractmitosis

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