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Related Experiment Videos

Diet, apoptosis, and carcinogenesis

C D Albright1, R Liu, M H Mar

  • 1Department of Nutrition, School of Public Health, University of North Carolina at Chapel Hill 27599, USA.

Advances in Experimental Medicine and Biology
|January 1, 1997
PubMed
Summary
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Dietary choline withdrawal induces programmed cell death in liver cells. However, cells adapted to low choline survive, resist apoptosis, and can form hepatocellular carcinomas, suggesting altered growth factor signaling.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Cancer Research

Background:

  • Choline is essential for liver health, impacting cell membranes and signaling.
  • Long-term choline deficiency in diets can induce liver cancer in animal models without known carcinogens.

Purpose of the Study:

  • To investigate how choline deficiency affects liver cell growth and death.
  • To understand the mechanisms behind malignant transformation in choline-deficient hepatocytes.

Main Methods:

  • Cultured CWSV-1 rat hepatocytes (immortalized with SV40 T-antigen) were subjected to varying choline concentrations (0, 5, 70 microM).
  • Apoptosis was assessed using DNA fragmentation assays (TUNEL, gel electrophoresis).
  • Growth factor expression (TGF-alpha, TGF-beta1) and signaling (EGF receptor phosphorylation) were analyzed.

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Main Results:

  • Acutely choline-deficient hepatocytes underwent p53-independent apoptosis.
  • Hepatocytes adapted to 5 microM choline resisted apoptosis and formed hepatocellular carcinomas in nude mice.
  • Adapted cells showed increased TGF-alpha and resistance to TGF-beta1-induced cell death, unlike acutely deficient cells.

Conclusions:

  • Acute choline withdrawal triggers programmed cell death in hepatocytes.
  • Adaptation to low choline confers resistance to apoptosis and promotes malignant transformation.
  • Choline deficiency may alter growth factor signaling pathways, enhancing cell survival and cancer development.