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D-galactose causes sinoatrial node dysfunction: from phenotype to mechanism.

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D-galactose induces age-related sinoatrial node dysfunction (SND) by promoting oxidative stress. This leads to altered gene expression and ion channel dysfunction, offering a new model for studying SND.

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Area of Science:

  • Cardiovascular Research
  • Aging Biology
  • Molecular Cardiology

Background:

  • Age-related sinoatrial node dysfunction (SND) is increasing with population aging.
  • Sinoatrial node (SAN) degeneration is a key factor in age-related SND.
  • A suitable animal model for studying age-related SND is lacking.

Purpose of the Study:

  • To investigate if D-galactose can induce SAN degeneration and age-related SND.
  • To explore the underlying molecular mechanisms of D-galactose-induced SAN degeneration.
  • To establish a novel animal model for age-related SND research.

Main Methods:

  • In vivo studies using C57BL/6 mice treated with D-galactose.
  • In vitro studies using mouse atrial myocytes exposed to D-galactose.
  • Assessment of senescence, cardiac function, SAN function, fibrosis, and oxidative stress.
  • Molecular analyses including immunofluorescence and Western blotting.
  • Electrophysiological assays and ROS scavenger (edaravone) treatment.

Main Results:

  • D-galactose treatment induced senescence, cardiac dysfunction, and SAN dysfunction in mice.
  • Oxidative stress was identified as a key mediator in D-galactose-induced SAN degeneration.
  • D-galactose caused ectopic PITX2 expression and downregulated SHOX2, impacting the GATA4/NKX2-5 axis.
  • This molecular cascade resulted in pacing-related ion channel dysfunction and SND development.

Conclusions:

  • D-galactose serves as a viable inducer of age-related SND, establishing a new animal model.
  • Oxidative stress is a critical factor in the pathogenesis of age-related SND.
  • The study elucidates a novel molecular pathway involving PITX2, SHOX2, and GATA4/NKX2-5 in SND development.