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© Andres Alcover
Scanning electron microscopy showing a conjugate formed between a T lymphocyte and an antigen presenting cell. It is worth noting the long shape of the T cell (Tc) polarized towards the antigen presenting cell (APC) and the membrane protrusions that adhere the T lymphocyte to the antigen presenting cell.
Publication : Annual review of immunology

Cell Biology of T Cell Receptor Expression and Regulation

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Annual review of immunology - 20 Dec 2017

Alcover A, Alarcón B, Di Bartolo V

Link to Pubmed [PMID] – 29261409

Annu. Rev. Immunol. 2017 Dec;

T cell receptors (TCRs) are protein complexes formed by six different polypeptides. In most T cells, TCRs are composed of αβ subunits displaying immunoglobulin-like variable domains that recognize peptide antigens associated with major histocompatibility complex molecules expressed on the surface of antigen-presenting cells. TCR αβ subunits are associated with the CD3 complex formed by the γ, δ, ε, and ζ subunits, which are invariable and ensure signal transduction. Here, we review how the expression and function of TCR complexes are orchestrated by several fine-tuned cellular processes that encompass (a) synthesis of the subunits and their correct assembly and expression at the plasma membrane as a single functional complex, (b) TCR membrane localization and dynamics at the plasma membrane and in endosomal compartments, (c) TCR signal transduction leading to T cell activation, and (d) TCR degradation. These processes balance each other to ensure efficient T cell responses to a variety of antigenic stimuli while preventing autoimmunity. Expected final online publication date for the Annual Review of Immunology Volume 36 is April 26, 2018. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

https://www.ncbi.nlm.nih.gov/pubmed/29261409