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Iron as a hepatotoxin

P Stål1

  • 1Department of Gastroenterology and Hepatology, Karolinska Institutet, Huddinge University Hospital, Sweden.

Digestive Diseases (Basel, Switzerland)
|July 1, 1995
PubMed
Summary

Excessive iron accumulation in the liver, known as hepatic iron overload, can cause cell damage, fibrosis, and increase cancer risk. Understanding iron

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Area of Science:

  • Hepatology and Iron Metabolism
  • Cellular Toxicology
  • Fibrogenesis and Carcinogenesis

Background:

  • Iron is essential but toxic in excess, primarily affecting the liver due to its storage role.
  • Hepatic iron overload disorders, including genetic hemochromatosis (GH) and transfusional overload, are common.
  • Excess iron causes cellular damage via free radical formation and lipid peroxidation, leading to sideronecrosis and potential cirrhosis.

Purpose of the Study:

  • To elucidate the mechanisms of iron-induced cytotoxicity and fibrosis in the liver.
  • To explore the role of iron overload in liver cancer development.
  • To clarify the unclear mechanisms underlying iron-induced liver fibrosis and its progression to cirrhosis.

Main Methods:

  • Review of mechanisms of iron toxicity, including free radical formation and lipid peroxidation.
  • Analysis of proposed pathways for iron-induced fibrogenesis involving cellular transformations.
  • Examination of in vitro and in vivo data on iron's genotoxic and mitostimulatory effects on hepatocytes.

Main Results:

  • Iron overload leads to hepatocellular damage, lipid peroxidation, and organelle dysfunction, potentially causing sideronecrosis.
  • Iron may induce fibrogenesis through transformation of fat-storing cells and activation of Kupffer cells.
  • Cirrhosis in GH patients significantly increases hepatocellular carcinoma risk; iron's direct role in tumorigenesis is still under investigation.

Conclusions:

  • Hepatic iron overload is a significant risk factor for liver damage, fibrosis, and hepatocellular carcinoma.
  • Further research is needed to fully understand iron's role in fibrogenesis and its contribution to liver cancer.
  • Iron's complex interplay with other hepatotoxic agents warrants continued investigation.

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