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Puromycin-sensitive aminopeptidase limits MHC class I presentation in dendritic cells but does not affect CD8 T cell responses during viral infections.

Previous experiments using enzyme inhibitors, cell lysates, and purified enzyme have suggested that puromycin-sensitive aminopeptidase (PSA) plays a role in creating and destroying MHC class I-presented peptides although its precise contribution to these processes is unknown. To examine the importance of this enzyme in MHC class I Ag presentation, we have generated PSA-deficient mice and cell lines from these animals. PSA-deficient mice are smaller and do not reproduce as well as wild type mice. In addition, dendritic cells from PSA-deficient mice display more MHC class I molecules on the cell surface, suggesting that PSA normally limits Ag presentation by destroying certain peptides in these key APCs. Surprisingly, MHC class I levels are not altered on other PSA-deficient cells and the processing and presentation of peptide precursors in PSA-deficient fibroblasts is normal. Moreover, PSA-deficient mice have normal numbers of T cells in the periphery, and respond as well as wild type mice to eight epitopes from three viruses. These data indicate that PSA may play a role in limiting MHC class I Ag presentation in dendritic cells in vivo but that it is not essential for generating most MHC class I-presented peptides or for stimulating CTL responses to several Ags.

Pubmed ID: 18209067 RIS Download

Mesh terms: Amino Acid Sequence | Aminopeptidases | Animals | Antigen Presentation | Antigens, Viral | CD8-Positive T-Lymphocytes | Dendritic Cells | Epitopes | Histocompatibility Antigens Class I | Mice | Mice, Mutant Strains | Molecular Sequence Data | Peptides | Virus Diseases | Viruses

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Associated grants

  • Agency: NIAID NIH HHS, Id: AI 07349
  • Agency: NIDDK NIH HHS, Id: DK 42520

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