Receptor-mediated T cell absorption of antigen presenting cell-derived molecules

Front Biosci (Landmark Ed). 2011 Jan 1;16:411-21. doi: 10.2741/3695.

Abstract

T cells tend to acquire a variety of cell surface molecules derived from antigen presenting cells (APCs). The molecule uptake occurs mainly during direct T/APC contact and is instigated by specific receptor/ligand interactions, such as T cell receptor (TCR) with a cognate peptide/MHC complex (pMHC) or CD28 with B7. The acquired molecules are targeted for internalization and degradation in the lysosome. Nevertheless, those molecules are expressed on the surface of T cells for a period of time. The presentation of APC-derived ligands by T cells exhibited a multitude of immunological effects via antigen-specific T/T interaction upon recognition of the absorbed antigens by contact with other T cells. Ligand uptake also occurs via absorption of membrane vesicles shed from APCs prior to contact (e.g., exosomes and plasma membrane-derived vesicles). As in ligand absorption via direct T/APC interaction, the absorption of pre-formed membrane vesicles is also dependent on specific receptor/ligand interactions. In this review, biological mechanisms underlying the ligand absorption process as well as the biological significance and application of the event will be discussed.

Publication types

  • Research Support, N.I.H., Extramural
  • Review

MeSH terms

  • Absorption
  • Animals
  • Antigen-Presenting Cells / immunology*
  • Exosomes / physiology
  • Humans
  • Ligands
  • Lymphocyte Activation
  • Mice
  • Receptors, Antigen, T-Cell / immunology
  • T-Lymphocytes / immunology*

Substances

  • Ligands
  • Receptors, Antigen, T-Cell