Journal
CLINICAL IMMUNOLOGY
Volume 125, Issue 2, Pages 184-193Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.clim.2007.07.018
Keywords
tumor immunology; plasmacytoid dendritic cell; Langerhans cell; sentinel lymph node; melanoma
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Plasmacytoid dendritic cells (pDC) represent the main source of interferon-a, a cytokine with antitumor activity. However, in vitro studies point to pDC as a key subset for induction of tolerance. Herein, we investigated pDC in sentinel lymph nodes (SLN) of melanoma patients. We report that pDC were constantly found in SLN and represented, with Langerhans cells, the most frequent dendritic cell subset. Their frequency in positive (with metastasis) SLN was significantly higher than in negative (without metastasis) SLN. PDC were observed in the T cell-rich areas of lymph nodes, particularly around high endothelial venules and, in metastatic nodes, they accumulated in close vicinity with melanoma nests. Finally, pDC capability to produce interferon-a in situ was impaired. Consistently, pDC expressed CD86, but neither CD80 nor CD83, suggesting a not complete activation in melanoma-draining lymph nodes. These results are consistent with the hypothesis of a tolerogenic rote played by pDC in tumor immunology. (C) 2007 Elsevier Inc. All rights reserved.
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