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Human neonatal dendritic cells are competent in MHC class I antigen processing and presentation

Marielle C Gold1, Tammie L Robinson, Matthew S Cook

  • 1Department of Pulmonary and Critical Care Medicine, Oregon Health & Science University, Portland, Oregon, USA. goldm@ohsu.edu

Plos One
|September 27, 2007
PubMed

Insights

Neonatal dendritic cells can process and present antigens via MHC class I, similar to adults. This suggests immune immaturity in antigen presentation may not explain why infants are more vulnerable to severe infections.

Area of Science:

  • Immunology
  • Neonatal Immunity
  • Cellular Immunology

Background:

  • Neonates exhibit increased susceptibility to severe infections compared to adults.
  • This heightened vulnerability is often attributed to immunological immaturity.
  • The antigen processing and presentation capacity of neonatal dendritic cells (DCs) to CD8+ T cells is not well understood.

Purpose of the Study:

  • To compare the antigen processing and presentation capabilities of neonatal and adult monocyte-derived dendritic cells (mo-DCs) via the MHC class I pathway.
  • To investigate potential defects in neonatal DCs that could contribute to increased susceptibility to pathogens.

Main Methods:

  • Utilized human CD8+ T cell clones to assess antigen presentation by neonatal and adult mo-DCs.
  • Evaluated the presentation of antigenic peptides, HLA-E-restricted antigens, and MHC class I-restricted antigens.
  • Assessed the processing and presentation of cell-associated antigens through cross-presentation via MHC class I.

Main Results:

  • Neonatal mo-DCs demonstrated no functional defects in processing and presenting antigens via the MHC class I pathway.
  • Specific functions assessed included peptide presentation, HLA-E-restricted antigen presentation, classical MHC class I antigen processing and presentation, and cross-presentation.

Conclusions:

  • The major histocompatibility complex (MHC) class I antigen processing and presentation pathway is fully functional in neonatal dendritic cells.
  • Neonatal immune immaturity in MHC class I antigen processing and presentation is unlikely to be the primary cause of diminished pathogen control in neonates.

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