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Related Experiment Videos

Receptor-dependent internalization of platelet-activating factor

N P Gerard1, C Gerard

  • 1Department of Medicine, Beth Israel Hospital, Boston, MA 02215.

Journal of Immunology (Baltimore, Md. : 1950)
|January 15, 1994
PubMed
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Platelet-activating factor (PAF) receptor expression in cells drives ligand internalization, a process temperature-dependent and inhibited by antagonists. This receptor-mediated uptake differs from nonspecific mechanisms in human neutrophils.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Platelet-activating factor (PAF) is a potent lipid mediator involved in inflammation and allergic responses.
  • Understanding the mechanisms of PAF receptor interaction is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the temperature-dependent interaction between the human platelet-activating factor (PAF) receptor and its ligand.
  • To elucidate the role of the PAF receptor in ligand internalization and its distinction from nonspecific uptake.

Main Methods:

  • Utilized COS-7 cells transfected with a human neutrophil PAF receptor.
  • Performed ligand-binding experiments at varying temperatures (4°C and 37°C) using [3H]PAF.
  • Employed an epitope-tagged fusion protein (Flag-PAF receptor) to track receptor dynamics.

Related Experiment Videos

  • Assessed the effect of a receptor antagonist (WEB 2086) on ligand internalization.

    • Main Results:

    • PAF receptor-transfected cells exhibited temperature-dependent ligand binding, with significantly higher association at 37°C compared to 4°C.
    • At 37°C, cell-associated PAF was largely internalized and incorporated into phospholipids.
    • Receptor expression was not affected by temperature alone, but PAF incubation at 37°C led to a decrease in cell surface receptor epitope.
    • Ligand internalization was inhibited by WEB 2086, confirming receptor dependence.
    • Nonspecific uptake pathways in untransfected cells or cells with other receptors showed minimal PAF internalization.

    Conclusions:

    • PAF internalization in COS-7 cells is dependent on the expression of the PAF receptor.
    • The observed temperature-dependent internalization mechanism is distinct from nonspecific uptake pathways found in human neutrophils.
    • These findings provide insights into the specific role of the PAF receptor in cellular responses to PAF.