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Disturbed expression and distribution of myocardial connexin 43 in sudden death patients with hyperthyroid heart

Bo Su1, Yao Chen2, Aimin Du3

  • 1Department of Pathology, School of Medicine, Yangtze University Jingzhou, Hubei Province, China.

International Journal of Clinical and Experimental Pathology
|January 23, 2020
PubMed

Insights

Sudden cardiac death in hyperthyroid heart disease is linked to reduced myocardial connexin 43 (Cx43) expression. This protein

Area of Science:

  • Cardiovascular Pathology
  • Molecular Cardiology
  • Endocrinology

Background:

  • Hyperthyroid heart disease is a known risk factor for sudden cardiac death.
  • Connexin 43 (Cx43) plays a crucial role in cardiac electrical coupling and function.
  • Alterations in Cx43 expression are implicated in various cardiac pathologies.

Purpose of the Study:

  • To investigate the relationship between myocardial connexin 43 (Cx43) expression and distribution in the left ventricle.
  • To determine the potential role of Cx43 in sudden death associated with hyperthyroid heart disease.

Main Methods:

  • Autopsy cases (n=27) were divided into three groups: sudden death from hyperthyroid heart disease (experimental), hyperthyroid, and control.
  • Immunohistochemical staining was employed to detect Cx43 expression in left ventricular myocardial tissue.
  • Quantitative analysis of Cx43 positive staining area and average optical density was performed.

Main Results:

  • Significantly decreased Cx43 positive staining area and average optical density were observed in the experimental group (sudden death due to hyperthyroid heart disease).
  • A decrease in the average optical density of Cx43 positive particles was noted in the hyperthyroid group compared to controls.
  • In the control group, Cx43 positive staining was localized to the intercalated discs.

Conclusions:

  • Myocardial Cx43 expression is significantly reduced in patients who experience sudden death from hyperthyroid heart disease.
  • The findings suggest that decreased expression of Cx43 may be a contributing factor to sudden cardiac death in hyperthyroid heart disease.
  • Further research is warranted to elucidate the precise mechanisms linking Cx43 dysfunction to hyperthyroid cardiac events.

Keywords:
Connexin 43hyperthyroid heart diseaseimmunohistochemistrypathologysudden death

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