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Updated: Feb 2, 2026

Preparation of CD4+ T Cells for Analysis of GD3 and GD2 Ganglioside Membrane Expression by Microscopy
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Preparation of CD4+ T Cells for Analysis of GD3 and GD2 Ganglioside Membrane Expression by Microscopy

Published on: November 8, 2016

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Sialic Acid-Dependent Inhibition of T Cells by Exosomal Ganglioside GD3 in Ovarian Tumor Microenvironments

Gautam N Shenoy1, Jenni Loyall1, Charles S Berenson1,2,3

  • 1Department of Microbiology and Immunology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY 14203.

Journal of Immunology (Baltimore, Md. : 1950)
|November 18, 2018
PubMed

Insights

Ganglioside GD3 on ovarian cancer exosomes causes T cell arrest, suppressing immune response. Blocking GD3 or removing it inhibits this effect, highlighting GD3 as a potential cancer immunotherapy target.

Area of Science:

  • Immunology
  • Cancer Biology
  • Exosome Biology

Background:

  • The tumor microenvironment often suppresses immune responses, presenting challenges for cancer therapy.
  • Exosomes from ovarian tumors can arrest T cell function, but the specific immunosuppressive factors remain unclear.

Purpose of the Study:

  • To identify the specific exosomal factors responsible for T cell arrest in ovarian cancer.
  • To investigate the role of ganglioside GD3 in exosome-mediated immunosuppression.

Main Methods:

  • Isolation of exosomes from human ovarian tumor ascites fluid.
  • Assessment of T cell activation and function following co-culture with exosomes.
  • Inhibition studies using anti-GD3 antibodies and enzymatic removal of sialic acid.

Main Results:

  • Ganglioside GD3 on the surface of ovarian tumor exosomes was causally linked to the functional arrest of T cells.
  • Blocking exosomal GD3 or removing GD3-positive exosomes prevented T cell arrest.
  • GD3-expressing liposomes mimicked the T cell inhibitory effect, independent of other exosomal factors.
  • Sialic acid groups on GD3 were essential for its immunosuppressive capacity.

Conclusions:

  • Ganglioside GD3 is a key mediator of T cell suppression by ovarian cancer exosomes.
  • GD3 represents a promising immunotherapeutic target for overcoming tumor-induced immunosuppression.

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