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Related Experiment Videos

Transmembrane signalling associated with ganglioside-induced CD4 modulation.

W J Morrison1, H Offner, A A Vandenbark

  • 1Neuroimmunology Research Laboratory, Veterans Administration Medical Center, Portland, OR 97207.

Immunopharmacology
|September 1, 1990
PubMed
Summary

Ganglioside GM1 treatment decreases CD4 surface expression on lymphoma cells by stimulating phosphoinositide breakdown and protein phosphorylation. This mechanism is distinct from protein kinase C pathways.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • CD4+ cells play a crucial role in immune responses.
  • Gangliosides are important cell surface molecules involved in cell signaling.
  • Understanding CD4 regulation is vital for immune system research.

Purpose of the Study:

  • To investigate the signaling mechanisms by which Ganglioside GM1 affects CD4+ cells.
  • To determine if GM1 influences CD4 surface expression and related cellular processes.
  • To elucidate the distinct pathways involved in GM1-mediated CD4 modulation.

Main Methods:

  • Treatment of CD4+ human CEM lymphoma cells with Ganglioside GM1.
  • Measurement of phosphoinositide (PI) breakdown and inositol phosphate (IP) production.

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  • Analysis of protein phosphorylation, CD4 surface expression, cAMP levels, and tyrosine kinase activity.
  • Comparison with Phorbol myristate acetate (PMA) and protein kinase C (PKC) inhibitor H7.

    • Main Results:

    • GM1 treatment stimulated transient PI breakdown, IP production, and protein phosphorylation.
    • GM1 induced a rapid decrease in CD4 surface expression.
    • GM1 stimulated phospholipase C activity but did not affect cAMP levels or tyrosine kinase activity.
    • PMA also decreased CD4 surface expression, an effect blocked by the PKC inhibitor H7, indicating a distinct mechanism for GM1.

    Conclusions:

    • GM1 triggers distinct signaling pathways involving PI turnover and protein phosphorylation to reduce CD4 surface expression.
    • The GM1-induced decrease in CD4 is independent of adenylate cyclase and tyrosine kinase activation.
    • GM1's mechanism for CD4 modulation differs from PKC-mediated internalization pathways.