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Cellular hypertrophy in cardiomyopathic patients is associated with lower creatine-stimulated mitochondrial

M Popovich1, S Kostin, T Branishte

  • 1Institute of Preventive and Clinical Cardiology, Kishinev Moldova and Cardiology Research Center, Moscow, Russia.

Molecular and Cellular Biochemistry
|February 9, 1995
PubMed

Insights

In dilated cardiomyopathy, larger heart cells (hypertrophy) correlate with reduced mitochondrial respiration and poorer cardiac function. This suggests energy supply issues may stem from cellular genetic problems.

Area of Science:

  • Cardiology
  • Mitochondrial Physiology
  • Cell Biology

Background:

  • Dilated cardiomyopathy (DCM) is a complex heart condition affecting muscle function.
  • Mitochondrial dysfunction is implicated in various heart diseases.
  • Cellular and nuclear hypertrophy are observed in some cardiomyopathies.

Purpose of the Study:

  • To investigate the relationship between morphometric indices (cell size) and mitochondrial respiration in DCM patients.
  • To explore potential links between cellular hypertrophy, energy metabolism, and cardiac function severity.

Main Methods:

  • Endomyocardial biopsies from 43 DCM patients were analyzed.
  • Mitochondrial respiration rates in saponin-skinned fibers were measured.
  • Morphometric indices (myocyte and nuclear diameter) were quantified.
  • Cardiac function parameters (left ventricular end-diastolic pressure, ejection fraction) were assessed.

Main Results:

  • Patients with significantly larger myocyte (30 ± 4 µm) and nuclear (57 ± 5 µm) diameters showed markedly lower creatine-stimulated mitochondrial respiration (36 ± 4%).
  • This group also exhibited higher left ventricular end-diastolic pressure and volume index, with decreased ejection fraction.
  • In contrast, patients with smaller cell sizes had higher mitochondrial respiration (90 ± 12%) and better cardiac function.

Conclusions:

  • Marked nuclear and cellular hypertrophy in DCM is associated with impaired mitochondrial respiration.
  • These findings suggest a link between severe cardiac failure and reduced energy supply to myofibrils.
  • Disturbances in the cellular genetic apparatus may underlie these energy supply problems in DCM.

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