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Identification of a leukemic counterpart of the plasmacytoid dendritic cells.
Blood 2001 May 16
This work aims to demonstrate that CD4(+)CD56(+) malignancies arise from transformed cells of the lymphoid-related plasmacytoid dendritic cell (pDC) subset. The analysis of malignant cells from 7 patients shows that in all cases, like pDCs, leukemic cells are negative for lineage markers CD3, CD19, CD13, CD33, and CD11c but express high levels of interleukin-3 receptor alpha chain (IL-3Ralpha), HLA-DR, and CD45RA. Tumor cells produce interferon-alpha in response to influenza virus, while upon maturation with IL-3 they become a powerful inducer of naive CD4(+) T-cell proliferation and promote their T-helper 2 polarization. As pDCs, leukemic cells also express pre-Talpha and lambda-like 14.1 transcripts, arguing in favor of a lymphoid origin. In addition, malignant cells express significant levels of CD56 and granzyme B. Overall, those observations suggest that CD4(+)CD56(+) leukemic cells could represent the malignant counterpart of pDCs, both of which are closely related to B, T, and NK cells.
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