Dendritic cell-T cell interactions: CD8αα expressed on dendritic cells regulates T cell proliferation

Li Hong, Tonya J. Webb, David S. Wilkes

Research output: Contribution to journalArticle

9 Scopus citations


Expression of the CD8αα homodimer has been used to differentiate lymphoid (CD8α+) from myeloid (CD8α-) dendritic cells (DCs). We have reported that CD8α+ and CD8α- DCs have differential abilities to stimulate proliferation in allogeneic T cells. However, no specific function has been attributed to DC-derived CD8α. The current study examines the hypothesis that CD8αα expression on DCs regulates DC-induced T cell activation. CD8α- transduced bone marrow-derived DCs were more potent stimulators of T cell proliferation, and produced significantly greater quantities of IL-12 in co-culture with T cells. LCK, a kinase whose expression is reported to be T cell-restricted and known to bind to the cytoplasmic tail of CD8αβ in T cells, was detected readily in primary CD8α+ splenic DCs and at greater levels than CD8α- DCs from the same tissues. LCK also co-precipitated with CD8α on immunblots strongly suggesting its role in CD8α+ DC-induced T cell activation. Collectively, these data show that CD8α expressed on DC may not only be a lineage/maturation marker but also contribute to DC function.

Original languageEnglish (US)
Pages (from-to)174-178
Number of pages5
JournalImmunology Letters
Issue number2
StatePublished - Feb 15 2007


  • CD8α
  • Dendritic cells
  • Lymphoid

ASJC Scopus subject areas

  • Immunology
  • Immunology and Allergy

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