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Macrophages, myofibroblasts and mast cells in a rat liver infected with Capillaria hepatica

Won-Il Jeong1, Sun-Hee Do, Il-Hwa Hong

  • 1Department of Veterinary Pathology, College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea.

Journal of Veterinary Science
|May 20, 2008
PubMed

Insights

Capillaria hepatica infection in rats causes liver nodules and fibrosis. Macrophage, myofibroblast, and mast cell interactions likely drive this septal fibrosis.

Area of Science:

  • Veterinary Pathology
  • Parasitology
  • Immunology

Background:

  • Capillaria hepatica is a parasitic nematode that infects rodents, including rats (Rattus norvegicus).
  • Hepatic fibrosis is a pathological condition characterized by the excessive accumulation of extracellular matrix in the liver.
  • Understanding the host-parasite interactions is crucial for diagnosing and managing parasitic infections.

Observation:

  • Gross examination of infected rat livers revealed scattered, yellowish-white nodules (2-3 mm) on the surface.
  • Microscopic analysis identified granulomatous and fibrotic nodules containing Capillaria hepatica eggs and/or adult worms.
  • Diffuse septal fibrosis was observed throughout the liver parenchyma.

Findings:

  • ED1-positive macrophages were present in the sinusoids of pseudolobules.
  • Myofibroblasts and mast cells were located within the fibrous septa.
  • Mast cells were frequently observed in close proximity to myofibroblasts.

Implications:

  • The study suggests a significant role for the interplay between macrophages, myofibroblasts, and mast cells in the development of septal fibrosis.
  • These findings contribute to understanding the pathogenesis of Capillaria hepatica infection in rats.
  • This research may inform future diagnostic and therapeutic strategies for parasitic liver diseases.

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