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Esophageal Cancer-Related Gene-4 Contributes to Lipopolysaccharide-Induced Ion Channel Dysfunction in hiPSC-Derived

Qiang Xu1,2, Xiangjie Zhang3, Maolin Hao3

  • 1School of Basic Medical Science, Southwest Medical University, Luzhou, People's Republic of China.

Journal of Inflammation Research
|December 9, 2024
PubMed
Abstract

Insights

Esophageal cancer-related gene-4 (ECRG4) exacerbates inflammation-induced cardiac ion channel dysfunction by upregulating Toll-Like-Receptor 4 and affecting NFκB signaling. ECRG4 plays a key role in inflammatory responses in cardiomyocytes.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Immunology

Background:

  • Esophageal cancer-related gene-4 (ECRG4) is implicated in inflammation and modulates ion channel function in cardiomyocytes.
  • The precise mechanisms by which ECRG4 influences cardiac electrical activity during inflammation remain unclear.

Purpose of the Study:

  • To investigate the role of ECRG4 in inflammation-induced ion channel dysfunction in cardiomyocytes.
  • To elucidate the molecular mechanisms linking ECRG4, inflammation, and cardiac electrophysiology.

Main Methods:

  • Human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) were exposed to lipopolysaccharide (LPS) to model endotoxin-induced inflammation.
  • Techniques included immunostaining, real-time PCR, and patch-clamp electrophysiology.
  • ECRG4 expression was manipulated via knockdown and overexpression.

Main Results:

  • LPS treatment increased ECRG4 expression in hiPSC-CMs.
  • ECRG4 knockdown reduced Toll-Like-Receptor 4 (TLR4) expression, inflammatory markers, and normalized action potential duration (APD) by modulating ISK and INCX.
  • ECRG4 overexpression mimicked LPS effects on ion currents, which were sensitive to NFκB signaling inhibition.

Conclusions:

  • LPS-induced cardiac ion channel dysfunction is mediated by ECRG4 upregulation and subsequent effects on NFκB signaling.
  • ECRG4 is a critical mediator of inflammatory responses and ion channel dysregulation in cardiomyocytes during endotoxemia.
Keywords:
arrhythmiasesophageal cancer-related gene-4human-induced pluripotent stem cell-derived cardiomyocytesinflammationlipopolysaccharide

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