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Related Experiment Videos

Mitochondrial DNA dysfunction in oncocytic hepatocytes.

Kurenai Tanji1, Govind Bhagat, Tuan H Vu

  • 1Department of Pathology, College of Physicians and Surgeons, Columbia University, NY, New York 10032, USA. kt8@columbia.edu

Liver International : Official Journal of the International Association for the Study of the Liver
|January 8, 2004
PubMed
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Hepatic oncocytes in chronic liver disease show deficiencies in mitochondrial DNA (mtDNA) and related enzymes. This study suggests mtDNA depletion is key to the development of these cells in the liver.

Area of Science:

  • Hepatology
  • Mitochondrial Biology
  • Cellular Pathology

Background:

  • Hepatic oncocytes, characterized by abundant eosinophilic cytoplasm from mitochondrial hyperplasia, appear in chronic liver diseases like hepatitis and cirrhosis.
  • Increased mitochondria in oncocytes are hypothesized to compensate for hepatocellular respiratory chain deficiencies, but their origin remains unclear.

Purpose of the Study:

  • To investigate the role of mitochondrial DNA (mtDNA) and nuclear DNA (nDNA)-encoded respiratory chain enzymes in hepatic oncocytes.
  • To determine the association between mtDNA depletion and hepatocellular oncocytic transformation in cirrhosis.

Main Methods:

  • Histoenzymatic and immunohistochemical staining for respiratory chain enzymes (mtDNA- and nDNA-encoded).
  • Immunostaining for double-strand-DNA (anti-DNA) and Ki-67 (proliferation marker).

Related Experiment Videos

  • Southern blot analysis to quantify mtDNA and nDNA levels.

    • Main Results:

    • Eighty percent of oncocytes exhibited deficiencies in cytochrome c oxidase and mtDNA-encoded complex IV subunit I, with preserved nDNA-encoded enzymes.
    • Approximately 50% of oncocytes showed absent or reduced cytoplasmic anti-DNA staining.
    • Southern blot revealed significant mtDNA reductions (66-85%) in three cirrhotic cases with oncocytes.

    Conclusions:

    • Hepatic oncocytes display marked deficiencies in mtDNA and mtDNA-encoded respiratory chain enzymes.
    • mtDNA depletion is implicated as a significant factor in the pathogenesis of hepatocellular oncocytic transformation.