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Low expression level but potent antigen presenting function of CD1d on monocyte lineage cells

F M Spada1, F Borriello, M Sugita

  • 1Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.

European Journal of Immunology
|November 28, 2000
PubMed

Insights

Monocyte lineage cells are potent stimulators of CD1d-restricted immune responses, despite low surface expression. Their endocytic system is crucial for efficient antigen loading onto CD1d, highlighting unique CD1d regulation.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD1d is a crucial antigen-presenting molecule for Natural Killer T (NK T) cell selection and activation.
  • NK T cells are a conserved T cell subset integral to immune responses.

Purpose of the Study:

  • To investigate the expression, regulation, and function of human CD1d in myeloid-derived antigen-presenting cells (APCs).
  • To understand the role of monocyte lineage cells in CD1d-restricted immune responses.

Main Methods:

  • Analysis of CD1d expression and regulation in monocytes, monocyte-derived dendritic cells, and macrophages.
  • Functional assays using NK T cell clones and the synthetic glycolipid antigen alpha-galactosyl ceramide.
  • Microscopic localization studies of CD1d within monocyte lineage cells.

Main Results:

  • CD1d is expressed as a mature glycoprotein by myeloid APCs, with constitutive expression not significantly upregulated by common cytokines.
  • Despite low surface levels, myeloid cells are highly effective APCs for NK T cell responses to alpha-galactosyl ceramide.
  • CD1d predominantly localizes to the endocytic system in monocyte lineage cells, facilitating efficient antigen loading.

Conclusions:

  • Monocyte lineage cells are significant stimulators of CD1d-restricted immune responses.
  • The unique regulation and endocytic localization of CD1d in these cells are critical for potent antigen presentation.

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