Histiocytoid cardiomyopathy: a mitochondrial disorder

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Josef Finsterer1

  • 1Neurological Department, Krankenanstalt Rudolfstiftung, Vienna, Austria. duarte@aonmail.at

Clinical Cardiology
|May 14, 2008
PubMed

Insights

Histiocytoid cardiomyopathy (HICMP) is a rare genetic heart disorder in children, often causing arrhythmias or dilated cardiomyopathy. This condition is characterized by abnormal heart cells and is considered a mitochondrial cardiomyopathy due to its association with mitochondrial DNA mutations.

Area of Science:

  • Cardiology
  • Genetics
  • Mitochondrial Biology

Background:

  • Histiocytoid cardiomyopathy (HICMP) is a rare genetic cardiac disorder affecting infants and children, predominantly girls.
  • Clinically, it manifests as severe cardiac arrhythmias or dilated cardiomyopathy.
  • Pathoanatomically, it features characteristic nodules composed of abnormal Purkinje fibers and histiocytoid myocytes.

Purpose of the Study:

  • To elucidate the pathological characteristics of Histiocytoid Cardiomyopathy.
  • To investigate the cellular and subcellular basis of HICMP.
  • To establish the classification of HICMP as a mitochondrial cardiomyopathy.

Main Methods:

  • Histopathological examination of cardiac tissue.
  • Analysis of cardiomyocyte morphology and mitochondrial content.
  • Assessment of mitochondrial enzyme activity (succinate-cytochrome c reductase, NADH-cytochrome c reductase).
  • Correlation with mitochondrial DNA (mtDNA) mutation status.

Main Results:

  • HICMP is characterized by subendocardial, epicardial, or valvular nodules containing abnormal Purkinje fibers and histiocytoid myocytes.
  • These myocytes are filled with an increased number of normal or abnormal mitochondria.
  • Yellowish areas in the myocardium consist of enlarged, histiocyte-like cells with foamy cytoplasm.
  • A frequent association with mitochondrial DNA mutations was observed.

Conclusions:

  • HICMP cardiomyocytes exhibit an increased number of mitochondria, some abnormal.
  • Markedly decreased mitochondrial enzyme activity (succinate-cytochrome c reductase, NADH-cytochrome c reductase) is observed.
  • HICMP should be classified as a mitochondrial cardiomyopathy due to its pathological and genetic links to mitochondrial dysfunction.

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