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Filamin C is Essential for mammalian myocardial integrity

Tongbin Wu1, Yujun Xu1, Lunfeng Zhang2

  • 1Department of Medicine, University of California San Diego, La Jolla, California, United States of America.

Plos Genetics
|January 27, 2023
PubMed

Insights

Filamin C (FLNC) is crucial for heart development, as its absence causes severe myocardial rupture in mice. Filamin C collaborates with β1 integrin to maintain heart structural integrity during development.

Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Filamin C (FLNC) is frequently mutated in cardiomyopathies.
  • The exact function of filamin C in the mammalian heart is not fully understood.

Purpose of the Study:

  • To investigate the role of filamin C in maintaining myocardial structural integrity during heart development.
  • To explore the relationship between filamin C and β1 integrin in cardiac development.

Main Methods:

  • Generation of global (FlncgKO) and cardiomyocyte-specific (FlnccKO) filamin C knockout mice.
  • Analysis of cardiac phenotype, including myocardial integrity and β1 integrin activation.
  • Conditional deletion of β1 integrin in cardiomyocytes.

Main Results:

  • Global and cardiomyocyte-specific filamin C knockout mice exhibited embryonic lethality due to severe ventricular myocardial rupture.
  • Filamin C deficiency led to attenuated β1 integrin activation in the myocardium.
  • Simultaneous deletion of filamin C and β1 integrin in cardiomyocytes exacerbated heart rupture compared to filamin C deletion alone.

Conclusions:

  • Filamin C is essential for maintaining the structural integrity of the developing mammalian heart.
  • Filamin C functions in conjunction with β1 integrin to ensure proper cardiac development.
  • These findings reveal a novel mechanism for cardiac development and provide insights into filamin C-associated cardiomyopathies.

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