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During maturation, murine myeloid dendritic cells (DCs) upregulated the expressions of CD11c, CD25, CD40, CD80, CD86, MHC II and programmed death 1 ligands 1 and 2 (PD-L1 and PD-L2). Differential expression patterns of PD-L1 and PD-L2 were found when DCs were triggered by CD40 ligand and TNF-alpha. PD-L1 expression was repressed and PD-L2 expression remained unchanged in mature CD40-ligated DCs, whereas TNF-alpha stimulated DCs kept high expression of PD-L1 and significantly enhanced PD-L2 expression on DCs. Proliferations of T lymphocytes stimulated by immature DCs were enhanced by blockade of the PD-1 and PD-1 ligand interaction. But inhibitive effects were found in T lymphocytes stimulated by CD40-ligated DCs. With the fine-tuned expressions of PD-L1 and PD-L2, CD40-ligated DCs could sustain a longer activation period and elicit a more efficient T lymphocyte activation.

cellular and molecular immunology/cellular and molecular immunology

Fine-Tuned Expression of Programmed Death 1 Ligands in Mature Dendritic Cells Stimulated by CD40 Ligand Is Critical for the Induction of an Efficient Tumor Specific Immune Response