Activation of human peripheral blood dendritic cells induces the CD86 co-stimulatory molecule

European Journal of Immunology
A D McLellanD N Hart

Abstract

Maximal T lymphocyte responses require presentation of antigen by major histocompatibility complex molecules and delivery of one or more co-stimulatory signals. Interaction of the CD28 molecule on T lymphocytes with its ligands on antigen-presenting cells (APC) initiates a critical co-stimulatory pathway inducing T lymphocyte proliferation and cytokine secretion. Dendritic cells (DC) are potent APC for a primary T lymphocyte response and potential CD28/CTLA-4 ligands on DC are, therefore, of particular functional relevance. In these experiments, the expression and function of the CD28/CTLA-4 ligands B7.1 (CD80) and B7.2 (CD86) were examined on human blood DC. Resting DC populations directly isolated by immunodepletion of lineage marker-positive cells lacked cell membrane expression of CD80 and expressed little or no CD86, although CD86, but not CD80 mRNA was detected by reverse transcription-polymerase chain reaction analysis. In contrast, low-density DC isolated after culture in vitro strongly expressed CD86 surface protein, but expressed limited or no CD80, although mRNA for both molecules were detected. Short-term culture of directly isolated DC up-regulated both CD80 and CD86 expression. Analysis of the kinetics of CD28/CTL...Continue Reading

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Citations

Dec 4, 1998·Springer Seminars in Immunopathology·R Thomas
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