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Sequential protooncogene expression during rat liver regeneration.

N L Thompson, J E Mead, L Braun

    Cancer Research
    |June 1, 1986
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    Liver regeneration involves sequential increases in protooncogene messenger RNAs (mRNAs) like c-fos, c-myc, and p53 before DNA synthesis. These changes mark hepatocyte cell cycle entry and progression during liver growth.

    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Hepatology

    Background:

    • Adult rat liver regeneration is a complex process involving cell proliferation.
    • Protooncogenes play critical roles in cell cycle regulation and growth.
    • Understanding gene expression dynamics is key to deciphering liver regeneration mechanisms.

    Purpose of the Study:

    • To investigate the temporal expression patterns of c-fos, c-myc, and p53 messenger RNAs (mRNAs) and p53 protein during liver regeneration.
    • To determine the role of transcriptional regulation in the early stages of liver regeneration.
    • To identify potential molecular markers for hepatocyte cell cycle progression.

    Main Methods:

    • Partial hepatectomy was performed on adult rats to stimulate liver growth.

    Related Experiment Videos

  • Messenger RNA (mRNA) and protein levels of c-fos, c-myc, p53, and ras p21 were quantified over time using molecular biology techniques.
  • Actinomycin D was used to assess the role of mRNA stability in gene expression.

    • Main Results:

    • c-fos, c-myc, and p53 mRNAs increased sequentially during the prereplicative phase preceding DNA synthesis.
    • A second transient phase of c-fos and c-myc expression was observed around 8 hours post-hepatectomy.
    • p53 protein levels rose between 12 and 15 hours, while ras p21 protein increased later during active cell division.

    Conclusions:

    • The transient and sequential expression of protooncogenes reflects hepatocyte entry and progression into the cell cycle.
    • These protooncogenes serve as potential markers for identifying factors involved in liver regeneration.
    • Transcriptional regulation is a key component of early gene expression changes during liver regeneration.