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Related Experiment Videos

Specific ganglioside binding to receptor sites on T lymphocytes that couple to ganglioside-induced decrease of CD4

W J Morrison1, H Offner, A A Vandenbark

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

Life Sciences
|January 1, 1989
PubMed
Summary

Gangliosides bind to T-helper lymphocytes, influencing CD4 expression. This binding mechanism explains how gangliosides specifically decrease CD4 levels on these immune cells.

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Area of Science:

  • Immunology
  • Cell Biology
  • Neuroscience

Background:

  • T-helper lymphocytes play a crucial role in immune responses.
  • CD4 expression on T-helper cells is vital for immune cell communication.
  • Gangliosides are complex glycosphingolipids found in cell membranes.

Purpose of the Study:

  • To characterize the binding of gangliosides to rat T-helper lymphocytes.
  • To investigate the relationship between ganglioside binding and CD4 expression modulation.
  • To elucidate the mechanism by which gangliosides affect CD4 levels.

Main Methods:

  • Radioligand binding assays using [3H]-GM1.
  • Saturation binding kinetics to determine dissociation constant (KD) and binding capacity.
  • Competitive inhibition studies with congeneric gangliosides.

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Main Results:

  • Monosialylated [3H]-GM1 binding to T-lymphocytes was time- and temperature-dependent.
  • The dissociation constant (KD) was 2.2 +/- 1.4 microM, with a binding capacity of approximately 2 fmoles/cell.
  • Ganglioside structure, specifically sialic acid moieties, influenced binding affinity, correlating with CD4 expression changes.

Conclusions:

  • Ganglioside binding to T-helper lymphocytes is specific and follows saturation kinetics.
  • The binding characteristics of gangliosides directly correlate with their ability to decrease CD4 expression.
  • Ganglioside-induced reduction in CD4 expression is initiated by specific binding to sites on CD4+ T-helper lymphocytes.