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CD4 segregates into specific detergent-resistant T-cell membrane microdomains.

J Millán1, J Cerny, V Horejsi

  • 1Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid, Consejo Superior de Investigaciones Científicas, Spain.

Tissue Antigens
|March 19, 1999
PubMed
Summary

CD4 in T cells localizes to distinct membrane microenvironments, including detergent-insoluble domains. This segregation suggests specialized functions for CD4 in T-cell receptor signaling and activation events.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • T cells utilize membrane microdomains rich in glycolipids and Src-like tyrosine kinases.
  • Glycosylphosphatidylinositol (GPI)-anchored proteins are key components of these detergent-insoluble membrane microdomains.

Purpose of the Study:

  • To investigate the distribution of the CD4 co-receptor within T-cell membranes.
  • To determine if CD4 localizes to specific membrane microenvironments and its association with GPI-anchored proteins.

Main Methods:

  • Differential membrane fractionation to separate soluble and detergent-insoluble fractions.
  • Analysis of CD4 localization within these fractions.
  • Investigating CD4 association with GPI-anchored proteins and kinase activity.

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Main Results:

  • Approximately 10% of CD4 is found in detergent-insoluble microdomains, while 90% is in soluble membranes.
  • Of the insoluble CD4, 60% associates with GPI-anchored proteins and glycolipid-dependent kinase activity.
  • CD4 levels in insoluble membranes remained unchanged upon T-cell receptor crosslinking, but CD3 subunits were recruited.

Conclusions:

  • CD4 segregates into at least three distinct membrane microenvironments: soluble, insoluble with GPI-anchored proteins, and insoluble without GPI-anchored proteins.
  • The recruitment of CD3 subunits to insoluble membranes upon stimulation suggests CD4's role in T-cell receptor-triggered activation.