Multiple intracellular routes in the cross-presentation of a soluble protein by murine dendritic cells

Deborah Palliser, Eduardo Guillien, Mindy Ju, Herman N. Eisen

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Soluble heat shock fusion proteins (Hsfp) stimulate mice to produce CD8+ CTL, indicating that these proteins are cross-presented by dendritic cells (DC) to naive CD8 T cells. We report that cross-presentation of these proteins depends upon their binding to DC receptors, likely belonging to the scavenger receptor superfamily. Hsfp entered DC by receptor-mediated endocytosis that was either inhibitable by cytochalasin D or not inhabitable, depending upon aggregation state and time. Most endocytosed Hsfp was transported to lysosomes, but not the small cross-presented fraction that exited early from the endocytic pathway and required access to proteasomes and TAP. Naive CD8 T cell (2C and OT-I) responses to DC incubated with Hsfp at 1 μM were matched by incubating DC with cognate octapeptides at 1-10 pM, indicating that display of very few class I MHC-peptide complexes per DC can be sufficient for cross-presentation. With an Hsfp (heat shock proiein-OVA) having peptide sequences for both CD4+ (OT-II) and CD8+ (OT-I) cells, the CD4 cells responded far more vigorously than the CD8 cells and many more class II MHC-peptide than class I MHC-peptide complexes were displayed.

Original languageEnglish (US)
Pages (from-to)1879-1887
Number of pages9
JournalJournal of Immunology
Volume174
Issue number4
DOIs
StatePublished - Feb 15 2005

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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