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Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption
09:20

Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption

Published on: October 4, 2019

The expression of connexin 43 in children with Tetralogy of Fallot

Jacek Kołcz1, Justyna Drukała, Małgorzata Bzowska

  • 1Department of Pediatric Cardiac Surgery, Polish-American Children's Hospital, Collegium Medicum, Jagiellonian University, Wielicka 265, 30-663 Kraków, Poland.

Cellular & Molecular Biology Letters
|July 13, 2005
PubMed

Insights

Abnormalities in Connexin 43 (Cx43) expression and distribution are linked to Tetralogy of Fallot (TOF) in children. Early correction may improve heart function by addressing Cx43 redistribution.

Area of Science:

  • Cardiovascular Biology
  • Developmental Biology
  • Cellular Biology

Background:

  • Abnormalities in Connexin 43 (Cx43) expression and distribution in cardiomyocytes can disrupt heart development and function.
  • Tetralogy of Fallot (TOF) is a common cyanotic congenital heart defect characterized by conotruncal anomalies, right ventricle dysfunction, and arrhythmias.

Purpose of the Study:

  • To investigate age-related changes in Cx43 expression and spatial distribution in cardiomyocytes of children with TOF compared to controls.
  • To understand the role of Cx43 disturbances in TOF pathogenesis and heart maturation.

Main Methods:

  • Confocal microscopy was employed to visualize Cx43 distribution.
  • Flow cytometry was utilized to quantify Cx43 expression levels.
  • Comparison was made between cardiomyocytes from TOF patients and age-matched controls without right ventricular outflow tract pathology.

Main Results:

  • TOF infants showed lower Cx43 expression compared to controls.
  • In TOF hearts, Cx43 was diffusely distributed across the cell surface, indicative of immature tissue, unlike controls where it localized to intercalated disks.
  • Cx43 expression increased with age in TOF patients, but its abnormal spatial distribution persisted.

Conclusions:

  • Disturbed Cx43 expression and localization in TOF may impair heart embryogenesis, maturation, and contribute to right ventricle dysfunction and arrhythmias.
  • Early redistribution of Cx43 and improved cardiac maturation support early surgical correction of TOF.

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