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Updated: May 20, 2025

Myocardial Infarction in Neonatal Mice, A Model of Cardiac Regeneration
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α Protein Kinase 3 Is Essential for Neonatal and Adult Cardiac Function.

Wei Feng1, Li Wang1, Julius Bogomolovas1

  • 1Division of Cardiovascular Medicine, Department of Medicine University of California San Diego La Jolla CA USA.

Journal of the American Heart Association
|March 26, 2025
PubMed
Summary
This summary is machine-generated.

Alpha protein kinase 3 (ALPK3) is essential for neonatal and adult heart function. Loss of ALPK3 causes dilated cardiomyopathy and hypertrophy, mirroring human pediatric heart conditions.

Keywords:
ALPK3MuRFM‐bandcardiomyopathysarcomere protein turnover

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Area of Science:

  • Cardiology
  • Molecular Biology
  • Genetics

Background:

  • Alpha protein kinase 3 (ALPK3) is an atypical kinase highly expressed in the heart.
  • Biallelic loss-of-function mutations in ALPK3 are linked to pediatric cardiomyopathy.
  • The precise role and regulatory mechanisms of ALPK3 in cardiac function remain unclear.

Purpose of the Study:

  • To investigate the essential stages and mechanisms of ALPK3 in cardiac function.
  • To elucidate the role of ALPK3 in neonatal and adult heart development and maintenance.

Main Methods:

  • Generated ALPK3 global knockout and inducible cardiac-specific knockout mice.
  • Conducted time-course physiological and morphological assessments.
  • Utilized a knock-in mouse model for ALPK3 localization studies.
  • Performed biochemical assays and RNA sequencing to explore regulatory mechanisms.

Main Results:

  • ALPK3 is critical for both neonatal and adult cardiac function.
  • Loss of ALPK3 leads to dilated cardiomyopathy and, in survivors, left ventricular hypertrophy.
  • ALPK3 localizes to the M-band in cardiomyocytes and interacts with muscle RING-finger proteins, potentially regulating thick filament protein turnover.

Conclusions:

  • ALPK3 is essential for maintaining neonatal and adult cardiac function.
  • ALPK3 acts as a scaffold protein, recruiting machinery for thick filament protein turnover regulation.
  • Findings provide insights into ALPK3-associated pediatric cardiomyopathy mechanisms.