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DcR3/TR6 modulates immune cell interactions.

Xiaochun Wan1, Guixiu Shi, Mark Semenuk

  • 1Laboratory of Transplantation Immunology, Notre Dame Hospital, University of Montreal, Montreal, Canada.

Journal of Cellular Biochemistry
|May 23, 2003
PubMed
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DcR3/TR6, a secreted protein, inhibits T-cell aggregation by preventing pseudopodium formation. This protein, secreted by stimulated PBMCs, regulates T-cell interactions crucial for immune responses.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • DcR3/TR6 is a secreted TNF receptor family member.
  • TR6 interacts with ligands like FasL, LIGHT, and TL1A.
  • TR6 modulates apoptosis and T-cell costimulation signaling pathways.

Purpose of the Study:

  • To investigate the role of TR6 in T-cell activation and interaction.
  • To determine the effect of TR6 on T-cell morphology and aggregation.

Main Methods:

  • Stimulation of peripheral blood mononuclear cells (PBMC) with T-cell mitogens.
  • Assessment of TR6 secretion by PBMCs.
  • Analysis of TR6's impact on T-cell actin polymerization and pseudopodium formation.
  • Evaluation of T-cell aggregation using soluble or solid phase TR6-Fc.

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Main Results:

  • TR6 is secreted by mitogen-stimulated PBMCs.
  • TR6 inhibits T-cell actin polymerization and pseudopodium formation.
  • TR6 suppresses T-cell aggregation induced by alloantigens, anti-CD3, or PHA.

Conclusions:

  • TR6 plays a regulatory role in T-cell interactions.
  • TR6 may control T-cell clustering, influencing immune responses.
  • TR6's inhibition of T-cell aggregation suggests a role in modulating cell-cell interactions with APCs and other T cells.