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Hepatocytes modulate the hepatic microvascular phenotype.

L Módis1, A Martinez-Hernandez

  • 1Department of Pathology and Cell Biology, Thomas Jefferson University, Medical College.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|December 1, 1991
PubMed
Summary
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Liver cells can change the structure of nearby blood vessels. This study shows that liver cells influence microvessel development, suggesting communication via soluble factors or extracellular matrix.

Area of Science:

  • Hepatology
  • Vascular Biology
  • Developmental Biology

Background:

  • Liver microvasculature uniquely features sinusoids, unlike capillaries found in other organs.
  • Hepatocytes lack a basement membrane, creating a permeable barrier.
  • Cirrhosis transforms liver sinusoids into continuous capillaries.

Purpose of the Study:

  • To investigate factors controlling hepatic microvasculature phenotype.
  • To understand how liver cells influence blood vessel development.

Main Methods:

  • Transplanting fetal rat liver fragments onto quail chorioallantoid membranes.
  • Culturing for 5 days, followed by light and electron microscopy.
  • Utilizing immunohistochemistry with cell-specific markers (quail, rat hepatocytes, basement membrane).

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Main Results:

  • Quail microvessels near rat hepatocytes adopted a sinusoidal phenotype.
  • These modified vessels exhibited fenestrations, endothelial gaps, and lacked basement membranes.
  • Normal quail chorioallantoid membrane vessels remained continuous capillaries.

Conclusions:

  • Liver cells (hepatocytes) actively modulate the phenotype of adjacent microvessels.
  • This modulation occurs even without direct cell-to-cell contact.
  • The communication likely involves soluble cytokines or extracellular matrix components.