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Blood glutathione decrease in subjects carrying lamin A/C gene mutations is an early marker of cardiac involvement

Christophe Meune1, Lara Khouzami, Karim Wahbi

  • 1Université Paris Descartes, AP-HP, Département de Cardiologie, Groupe Hospitalier Cochin, F-75014, France.

Neuromuscular Disorders : NMD
|November 11, 2011
PubMed

Insights

Blood glutathione levels can help detect early cardiac dysfunction in Emery-Dreifuss muscular dystrophy patients with LMNA gene mutations. This biomarker may identify reduced ventricular contractility before significant changes in ejection fraction occur.

Area of Science:

  • Cardiology
  • Genetics
  • Biochemistry

Background:

  • Dominant inherited Emery-Dreifuss muscular dystrophy (EDMD) and limb-girdle muscular dystrophy type 1B (LGMD1B) are linked to LMNA gene mutations.
  • These conditions often present with life-threatening cardiac disease, yet reliable early diagnostic biomarkers are lacking.
  • Glutathione depletion is observed in non-genetic cardiac diseases, suggesting a potential role in cardiac health.

Purpose of the Study:

  • To investigate blood glutathione levels as a potential biomarker for early cardiac dysfunction in LMNA-mutated patients.
  • To assess the correlation between blood glutathione and left/right ventricular (LV/RV) contractility.
  • To determine if blood glutathione can reliably detect reduced contractility in patients with preserved ejection fraction.

Main Methods:

  • Examined blood glutathione levels in 22 LMNA-mutated subjects with preserved LVEF (>40%).
  • Evaluated LV/RV contractility using echocardiography with tissue-Doppler imaging.
  • Correlated blood glutathione levels with cardiac contractility and used ROC analysis to assess diagnostic accuracy.

Main Results:

  • Blood glutathione levels positively correlated with LV and RV contractility (p<0.05).
  • Subjects with reduced LV/RV contractility showed a 23% decrease in blood glutathione compared to those with normal contractility.
  • ROC analysis indicated blood glutathione reliably detects reduced LV/RV contractility (AUC: 0.90, p=0.01).

Conclusions:

  • Decreased blood glutathione may serve as an early indicator of reduced ventricular contractility in LMNA-mutated muscular dystrophy patients.
  • This biomarker could aid in the early detection of cardiac involvement before significant changes in LVEF.
  • Blood glutathione offers a promising, non-invasive tool for monitoring cardiac health in this patient population.

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