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Highly conserved antigen-presenting function of CD1d molecules.

L Brossay1, M Kronenberg

  • 1Division of Developmental Immunology, La Jolla Institute of Allergy and Immunology, 10355 Science Center Drive, San Diego CA 92121, USA. Brossay@liai.org

Immunogenetics
|December 22, 1999
PubMed
Summary
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Nonclassical antigen-presenting molecules, like CD1d, show high functional conservation between species. This suggests a vital role for CD1d recognition by Natural Killer T cells in the immune system.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Nonclassical antigen-presenting molecules (APCs) are proposed to have conserved functions due to limited polymorphism.
  • However, the major histocompatibility complex shows significant evolutionary changes, with little interspecies conservation of nonclassical class I molecules.

Purpose of the Study:

  • To investigate the functional conservation of the CD1d molecule and its interaction with Natural Killer T cells (NKTs) across mammalian species.
  • To assess the role of CD1d recognition in the immune system.

Main Methods:

  • Comparative analysis of CD1d molecule function and its interaction with T cell receptors (TCRs) on NKT cells in mice and humans.
  • Evaluation of CD1d recognition in the presence and absence of exogenous antigens, specifically lipoglycans.

Related Experiment Videos

Main Results:

  • The CD1d molecule exhibits a high degree of functional conservation between mice and humans.
  • This conservation is evident in its interaction with the relatively invariant TCRs of NKT cells.
  • CD1d recognition by NKT cells is conserved, irrespective of the presence of exogenous lipoglycan antigens.

Conclusions:

  • The significant functional and phenotypic conservation of NKT cells and CD1d recognition across mammalian species suggests an essential immune function.
  • CD1d-mediated antigen presentation to NKT cells represents a conserved mechanism critical for immune responses.