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Related Experiment Videos

CD1 expression is not affected by human peptide transporter deficiency

D Hanau1, D Fricker, T Bieber

  • 1Histocompatibility Laboratory, Regional Center for Blood Transfusion, Strasbourg, France.

Human Immunology
|September 1, 1994
PubMed
Summary

Transporter associated with antigen processing (TAP) deficiency impairs conventional MHC class I expression. However, human CD1 molecules, a type of nonconventional class I, remain stable and functional, suggesting TAP-independent peptide presentation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Major histocompatibility complex (MHC) class I molecules present endogenous peptides to cytotoxic T cells.
  • Peptide transport into the endoplasmic reticulum is mediated by transporter associated with antigen processing (TAP) molecules.
  • TAP deficiency results in unstable, poorly expressed MHC class I molecules.

Observation:

  • Human patients with homozygous TAP deficiency were studied.
  • CD1a and CD1c expression on Langerhans cells and in vitro-differentiated dendritic cells was assessed.
  • CD1a molecules on dendritic cells were evaluated for functionality via endocytosis.

Findings:

  • CD1a and CD1c molecules are normally expressed on Langerhans cells in TAP-deficient patients.

Related Experiment Videos

  • CD1a, CD1b, and CD1c are expressed on dendritic cells differentiated from monocytes of TAP-deficient individuals.
  • Surface CD1a molecules on dendritic cells are functional, undergoing receptor-mediated endocytosis.

    • Implications:

    • CD1 molecules may be inherently stable, independent of TAP-mediated peptide loading.
    • CD1 antigens might present peptides through a TAP-independent pathway.
    • This suggests a distinct mechanism of antigen presentation for nonconventional class I molecules like CD1.