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CD1: antigen presentation and T cell function

Manfred Brigl1, Michael B Brenner

  • 1Division of Rheumatology, Immunology, and Allergy, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA. mbrigl@rics.bwh.harvard.edu

Annual Review of Immunology
|March 23, 2004
PubMed

Insights

This review explores CD1 molecules and their T cells, detailing how they present lipid antigens to initiate immune responses. These CD1-restricted T cells are crucial for immunity against microbes, tumors, and autoimmunity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • CD1 molecules present lipid antigens to T cells, bridging innate and adaptive immunity.
  • Lipid antigen presentation by CD1 involves specific binding within hydrophobic pockets and TCR recognition of exposed headgroups.
  • CD1-restricted T cells perform diverse functions, including effector, helper, and adjuvant-like activities, interacting with various immune cells.

Purpose of the Study:

  • To review the features of CD1 genes and proteins.
  • To elucidate the intracellular trafficking and lipid antigen sampling mechanisms of CD1 molecules.
  • To summarize the roles of CD1-restricted T cells in various diseases and immune responses.

Main Methods:

  • Literature review of CD1 molecule function and T cell interactions.
  • Analysis of molecular mechanisms of lipid antigen binding to CD1.
  • Examination of the roles of CD1-restricted T cells in different disease contexts.

Main Results:

  • CD1 molecules bind lipid antigens, exposing polar headgroups for T cell receptor (TCR) recognition.
  • CD1-restricted T cells contribute to innate and adaptive immunity, interacting with macrophages, dendritic cells, NK cells, T cells, and B cells.
  • Differences in CD1a, CD1b, CD1c, and CD1d functions are highlighted, with unique roles for CD1d-restricted NKT cells.

Conclusions:

  • CD1-restricted T cells play significant roles in antimicrobial immunity, antitumor responses, and immune homeostasis.
  • Understanding CD1 biology is vital for developing novel immunotherapies for various diseases.
  • Invariant TCR alpha chains and self-lipid reactivity confer unique effector functions to NKT cells.

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