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CD69: from activation marker to metabolic gatekeeper

Danay Cibrián1,2,3, Francisco Sánchez-Madrid1,2,3

  • 1Hospital Universitario de la Princesa, Instituto Investigación Sanitaria Princesa (IIS-IP), Universidad Autónoma de Madrid, Madrid, Spain.

European Journal of Immunology
|May 6, 2017
PubMed

Insights

CD69, a C-lectin receptor, marks lymphocyte activation and tissue retention. It regulates T-cell differentiation and cytokine secretion, influencing immune responses through signaling and metabolic reprogramming.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Signaling

Background:

  • CD69 is a type II C-lectin receptor and an early marker of lymphocyte activation.
  • It is expressed on tissue-resident immune cells, including resident memory T (TRM) and gamma delta (γδ) T cells, indicating tissue retention.
  • CD69 influences T-cell functions, affecting migration, effector, and regulatory phenotypes.

Purpose of the Study:

  • To explore the molecular signaling pathways mediated by CD69.
  • To investigate CD69's role in the metabolic reprogramming of T helper (TH) effector lineages.
  • To discuss new insights into CD69's regulation of immune responses.

Main Methods:

  • Review of recent evidence on CD69 function and signaling.
  • Analysis of CD69's role in T-cell differentiation and cytokine production.
  • Discussion of CD69 ligands and their impact on immune cell behavior.

Main Results:

  • CD69 regulates the differentiation of regulatory T (Treg) cells.
  • CD69 controls the secretion of key cytokines like IFN-γ, IL-17, and IL-22.
  • CD69 signaling is influenced by ligands such as Galectin-1 and occurs both in lymphoid organs and the periphery.

Conclusions:

  • CD69 plays a critical role in regulating T-cell function, including differentiation and cytokine production.
  • CD69 signaling, modulated by ligands and microenvironmental factors, impacts immune cell behavior and tissue residency.
  • Further understanding of CD69's involvement in metabolic reprogramming is crucial for deciphering TH-effector lineage regulation.

Keywords:
CD69Galectin-1LAT1MetabolismS1P1T cellsmTOR

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