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A Detailed Study to Discover the Trade between Left Atrial Blood Flow, Expression of Calcium-Activated Potassium

Pin Shen1, Misbahul Ferdous2, Xiaoqi Wang1

  • 1Department of Cardiovascular Surgery, Fuwai Yunnan Cardiovascular Hospital, Kunming 650102, China.

Cells
|May 14, 2022
PubMed

Insights

Increased turbulent shear stress and wall pressure in the left atrium correlate with elevated calcium-activated potassium channels (IKCa2.3/3.1) and signaling proteins, offering insights into valvular atrial fibrillation (VAF) and thrombosis.

Area of Science:

  • Cardiovascular Physiology
  • Biomedical Engineering
  • Molecular Biology

Background:

  • Valvular atrial fibrillation (VAF) involves complex interactions between cardiac mechanics and cellular signaling.
  • Understanding the transformation of mechanical signals into biological responses is crucial for VAF research.
  • The role of calcium-activated potassium channels in VAF pathophysiology requires further elucidation.

Purpose of the Study:

  • To investigate the correlation between left atrial (LA) flow field mechanics, valvular atrial fibrillation (VAF), and thrombosis.
  • To explore the relationship between turbulent shear stress (TSS), wall pressure, and the expression of specific ion channels and proteins in the LA.
  • To elucidate the potential link between IKCa2.3 and hemodynamic changes in the LA.

Main Methods:

  • Computational fluid dynamics (CFD) simulations to analyze LA flow parameters like TSS and wall pressure.
  • Real-time PCR and western blotting to quantify mRNA and protein expression of IKCa2.3/3.1, AKT1, and P300 in patient atrial tissue.
  • Analysis of atrial tissue from 90 patients, including a valvular disease group.

Main Results:

  • Patients with valvular disease exhibited increased TSS and wall pressure in the LA, particularly near the mitral valve.
  • Elevated mRNA and protein expression levels of IKCa2.3/3.1, AKT1, and P300 were observed in disease groups (p < 0.05).
  • Significant increases in TSS were noted in specific regions of the LA, correlating with increased protein and channel expression.

Conclusions:

  • Changes in LA hemodynamic parameters, specifically TSS and wall pressure, are associated with the upregulation of IKCa2.3/3.1, AKT1, and P300.
  • These findings suggest a mechanical-to-biological signaling pathway linking atrial mechanics to molecular changes in VAF.
  • The study provides preliminary evidence for a correlation between IKCa2.3 and LA hemodynamic alterations, contributing to VAF pathogenesis understanding.

Keywords:
IKCa2.3/3.1computational modelthrombosisturbulent shear stressvalvular atrial fibrillation

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