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Human BDCA2+CD123+CD56+ dendritic cells (DCs) related to blastic plasmacytoid dendritic cell neoplasm represent a
Haisheng Yu1,2, Peng Zhang3,2, Xiangyun Yin1,2
1Key Laboratory of Immunity and Infection, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101 China.
Insights
Researchers identified a novel dendritic cell (DC) subset, CD56(+) DCs, which share features with myeloid DCs (mDCs) but not plasmacytoid DCs (pDCs). This finding reclassifies certain hematological malignancies, like blastic plasmacytoid dendritic cell neoplasm (BPDCN).
Area of Science:
- Immunology
- Cell Biology
- Hematology
Background:
- Dendritic cells (DCs) are crucial immune cells with distinct subsets: plasmacytoid DCs (pDCs) and myeloid DCs (mDCs).
- pDCs are known for rapid type I interferon (IFN-I) production via Toll-like receptors (TLRs) 7/9.
- Myeloid DCs (mDCs) have different functions, including IL-12 production and T cell priming.
Purpose of the Study:
- To characterize a novel CD56(+) dendritic cell (DC) population.
- To determine the functional and transcriptional relationship of CD56(+) DCs to pDCs and mDCs.
- To re-evaluate the classification of blastic plasmacytoid dendritic cell neoplasm (BPDCN).
Main Methods:
- Flow cytometry to identify cell surface markers (CD56, CD123, BDCA2).
- Gene-wide transcriptional profiling to compare CD56(+) DCs with pDCs and mDCs.
- Functional assays measuring cytokine production (e.g., IL-12) and T cell priming capacity.
Main Results:
- A CD56(+) DC population was identified, expressing pDC markers but producing less IFN-I.
- Transcriptional profiling clustered CD56(+) DCs with mDCs, not pDCs.
- CD56(+) DCs functionally resemble mDCs, producing IL-12 and priming T cells.
Conclusions:
- CD56(+) DCs represent a novel myeloid DC subset with some plasmacytoid DC features.
- Blastic plasmacytoid dendritic cell neoplasm (BPDCN) is transcriptionally closer to CD56(+) DCs than pDCs.
- BPDCN may represent a tumor counterpart of CD56(+) myeloid DCs.
Abstract:
Dendritic cells (DCs) comprise two functionally distinct subsets: plasmacytoid DCs (pDCs) and myeloid DCs (mDCs). pDCs are specialized in rapid and massive secretion of type I interferon (IFN-I) in response to nucleic acids through Toll like receptor (TLR)-7 or TLR-9. In this report, we characterized a CD56(+) DC population that express typical pDC markers including CD123 and BDCA2 but produce much less IFN-I comparing with pDCs. In addition, CD56(+) DCs cluster together with mDCs but not pDCs by genome-wide transcriptional profiling. Accordingly, CD56(+) DCs functionally resemble mDCs by producing IL-12 upon TLR4 stimulation and priming naïve T cells without prior activation. These data suggest that the CD56(+) DCs represent a novel mDC subset mixed with some pDC features. A CD4(+)CD56(+) hematological malignancy was classified as blastic plasmacytoid dendritic cell neoplasm (BPDCN) due to its expression of characteristic molecules of pDCs. However, we demonstrated that BPDCN is closer to CD56(+) DCs than pDCs by global gene-expression profiling. Thus, we propose that the CD4(+)CD56(+) neoplasm may be a tumor counterpart of CD56(+) mDCs but not pDCs.
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