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Hepatocyte transplantation and drug-induced perturbations in liver cell compartments

Yao-Ming Wu1, Brigid Joseph, Ekaterine Berishvili

  • 1Marion Bessin Liver Research Center, Diabetes Center, Cancer Research Center, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

Hepatology (Baltimore, Md.)
|October 16, 2007
PubMed
Abstract

Insights

Drug-induced liver injury mechanisms were studied using transplanted reporter cells in mice. This revealed how combined drug exposures cause endothelial and hepatocyte damage, leading to liver repopulation, with sex-based differences observed.

Area of Science:

  • Hepatology and Toxicology
  • Transplantation Biology
  • Drug Metabolism and Pharmacokinetics

Background:

  • Drug-induced liver injury (DILI) poses a significant medical challenge.
  • Understanding the mechanisms of DILI is crucial for developing effective treatments.
  • Transplanted cells offer a novel approach to study liver injury and repair.

Purpose of the Study:

  • To delineate the mechanisms of drug-induced hepatic injury using a reporter cell system.
  • To investigate the roles of hepatic sinusoidal endothelium and hepatocytes in DILI.
  • To assess the impact of specific drug combinations on liver damage and regeneration.

Main Methods:

  • Utilized dipeptidyl peptidase IV-deficient mice as a reporter system.
  • Administered phenytoin, rifampicin, and monocrotaline to mice.
  • Performed intrasplenic transplantation of healthy C57BL/6 mouse hepatocytes.
  • Assessed liver damage via serologic and tissue studies.
  • Evaluated transplanted cell engraftment and liver repopulation using histochemical staining.

Main Results:

  • Monocrotaline induced hepatic sinusoidal endothelial denudation and increased serum hyaluronic acid.
  • Combined drug treatment (phenytoin, rifampicin, monocrotaline) exacerbated endothelial damage and improved cell engraftment.
  • Hepatocyte injury, not evident in conventional studies, led to transplanted cell proliferation and liver repopulation.
  • Liver repopulation was more efficient in males, linked to greater induction of cytochrome P450 3A4 by phenytoin and rifampicin.
  • Monocrotaline-induced endothelial injury was retargeted to involve hepatocytes long-term.

Conclusions:

  • Transplanted reporter cells provide insights into liver cell compartment homeostasis.
  • Targeted injury of hepatic endothelial and parenchymal cells advances liver cell therapy.
  • Sex-specific differences in drug metabolism influence liver regeneration kinetics.

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