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Related Experiment Videos

TGF alpha in normal physiology.

J E Kudlow1, J D Bjorge

  • 1Department of Medicine, University of Alabama, Birmingham 35294.

Seminars in Cancer Biology
|August 1, 1990
PubMed
Summary
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Transforming growth factor-alpha (TGF alpha) and its receptor are present in normal tissues and regulated by phorbol esters. Autocrine loops may exist, but antibodies did not block TGF alpha-EGF receptor interactions in breast cancer.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Transforming growth factor-alpha (TGF alpha) is a key signaling molecule.
  • Its expression and receptor regulation are crucial in normal tissues and disease.

Purpose of the Study:

  • To review the localization of TGF alpha and its receptor in normal tissues.
  • To investigate the regulation of TGF alpha synthesis and receptor expression.
  • To explore potential autocrine feedback loops in cancer cells.

Main Methods:

  • Immunohistochemistry to detect TGF alpha in tissues.
  • mRNA analysis to compare expression in brain stem and tumor cells.
  • Cell culture experiments to study regulation by phorbol esters and EGF.
  • Antibody blockade to inhibit TGF alpha-EGF receptor interaction.

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  • Protein kinase C inhibition studies.

    • Main Results:

    • TGF alpha was detected in brain neurons; brain stem and renal tumor TGF alpha mRNA are similar.
    • Phorbol esters regulate TGF alpha secretion and mRNA in pituitary cells and stimulate EGF receptor expression.
    • EGF and phorbol esters stimulate both TGF alpha and EGF receptor expression in breast cancer cells.
    • Antibodies blocking TGF alpha-EGF receptor interaction did not disrupt the autocrine loop.
    • EGF-induced stimulation of TGF alpha and EGF receptor requires protein kinase C.

    Conclusions:

    • TGF alpha and its receptor are expressed in normal tissues and their synthesis can be regulated.
    • An autocrine positive feedback loop involving TGF alpha and its receptor may exist, particularly in breast cancer.
    • Protein kinase C activation is implicated in the regulation of TGF alpha and EGF receptor expression by EGF.
    • Hormones activating protein kinase C could potentially regulate TGF alpha and EGF receptor expression.