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Defective maturation of dendritic cells in common variable immunodeficiency

T H Scott-Taylor1, M R Green, M Raeiszadeh

  • 1Department of Immunology, Royal Free and University College Medical School, London, UK.

Clinical and Experimental Immunology
|August 16, 2006
PubMed

Insights

Monocyte-derived dendritic cells in common variable immunodeficiency (CVID) fail to properly express surface molecules. This defect in antigen presentation may underlie antibody deficiency in CVID patients.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Common variable immunodeficiency (CVID) is characterized by antibody deficiency.
  • Monocyte-derived dendritic cells (MdDCs) in CVID patients exhibit reduced surface expression of mature cell markers.

Purpose of the Study:

  • To investigate the molecular mechanisms behind the reduced surface molecule expression in CVID MdDCs.
  • To determine if these cellular defects contribute to the immunodeficiency observed in CVID.

Main Methods:

  • Flow cytometry and confocal microscopy were used to analyze surface molecule expression and cellular localization.
  • Maturation of MdDCs in vitro was induced using standard procedures.
  • Analysis included Major histocompatibility complex (MHC) class II DR, CD86, CD83, and CD40 expression.
  • Phagocytosis assays were performed to assess monocyte-like functions.

Main Results:

  • CVID MdDCs showed a partial failure to express MHC class II DR on the cell surface due to cytoplasmic retention.
  • CD40 expression was reduced, while MHC class I, CD86, and CD83 were expressed normally.
  • CVID MdDCs displayed increased internalization of surface MHC class II DR and impaired polarization.
  • These cells retained monocyte characteristics, including CD14 expression and phagocytic capacity.

Conclusions:

  • Defective surface expression and localization of MHC class II DR in CVID MdDCs impair antigen presentation.
  • These cellular abnormalities represent a potential fundamental defect contributing to antibody deficiency in a subset of CVID patients.

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