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Endothelin-1 expression by human hepatocellular carcinoma

S Kar1, S A Yousem, B I Carr

  • 1Pittsburgh Transplantation Institute, University of Pittsburgh School of Medicine, PA, USA.

Biochemical and Biophysical Research Communications
|November 13, 1995
PubMed
Summary

Hepatocellular carcinoma (HCC) patients show higher endothelin-1 (ET-1) levels. This study found ET-1 is present and actively produced in human HCC tumors, linking it to tumor vascularity.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Vascular Biology

Background:

  • Elevated plasma levels of endothelin-1 (ET-1) are observed in hepatocellular carcinoma (HCC) patients compared to healthy individuals.
  • The specific role and source of ET-1 within HCC tumors require further elucidation.

Purpose of the Study:

  • To investigate the presence and synthesis of endothelin-1 (ET-1) within human hepatocellular carcinoma (HCC) tissues.
  • To explore the relationship between ET-1 expression and tumor vascularity in HCC.

Main Methods:

  • Immunohistochemical staining of human HCC tissues for ET-1.
  • Assessment of ET-1 messenger RNA (mRNA) expression in HCC tissue samples.
  • Correlation analysis between ET-1 immunostaining and tumor vascularity determined by hepatic angiography.

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Main Results:

  • Endothelin-1 (ET-1) immunoreactivity was detected in 70% (14/20) of human HCC tumor tissues.
  • Positive ET-1 staining was observed in neoplastic hepatocytes and cells lining tumor-feeding vessels.
  • A significant association was found between ET-1 staining in perivascular cells and tumor vascularity.
  • All ET-1-positive HCC tissues also expressed ET-1 mRNA, confirming active tumor synthesis.

Conclusions:

  • Endothelin-1 (ET-1) is actively synthesized by hepatocellular carcinoma (HCC) tumors.
  • ET-1 expression in HCC is associated with tumor vascularity, particularly in cells surrounding tumor blood vessels.
  • These findings suggest a potential role for ET-1 in HCC progression and angiogenesis.