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Tissue-Resident Memory CD8+ T Cells: From Phenotype to Function.

David J Topham1,2, Emma C Reilly1

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|April 11, 2018
PubMed
Summary
This summary is machine-generated.

Tissue-resident memory CD8+ T cells (T_RM) defend tissues. This review explores how CD49a and CD103 expression impacts T_RM positioning and function in mucosal tissues for immune protection.

Keywords:
T cellscellularimmunityinfectionintegrinsmemorytissue distribution

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Area of Science:

  • Immunology
  • Cell Biology
  • Tissue Engineering

Background:

  • Tissue-resident memory CD8+ T cells (T_RM) are crucial for defending non-lymphoid tissues against infection.
  • T_RM are established late in infection resolution and characterized by specific cell surface markers like CD69, CD103, CD49a, and CD44.
  • The environmental cues and timing of signals that imprint T_RM phenotypes are not fully understood, with evidence suggesting imprinting can occur in both lymph nodes and peripheral tissues.

Purpose of the Study:

  • To review the role of CD49a and CD103 expression in T_RM positioning within peripheral tissues.
  • To discuss the differential expression and function of CD49a and CD103 in T_RM.
  • To highlight the importance of these molecules for immune protection mediated by T_RM in mucosal tissues.

Main Methods:

  • Review of existing literature on T_RM cell biology and immunology.
  • Analysis of studies investigating the expression patterns of CD49a and CD103 on T_RM.
  • Examination of the functional implications of CD49a and CD103 in T_RM adhesion and positioning.

Main Results:

  • CD49a and CD103 are key markers for T_RM, influencing their adhesion properties (collagen and E-cadherin, respectively).
  • Expression of CD49a and CD103 often appears later in the immune response, suggesting specific environmental imprinting.
  • CD49a is broadly expressed in peripheral tissues, while CD103 expression is more restricted, potentially defining distinct T_RM subsets.

Conclusions:

  • CD49a and CD103 are critical for T_RM positioning and function in peripheral tissues.
  • Understanding the differential roles of CD49a and CD103 is essential for comprehending T_RM-mediated mucosal immunity.
  • Further research is needed to elucidate the precise mechanisms of T_RM imprinting and the functional interplay between CD49a and CD103.