Abstract
TH2-inducing dendritic cells (DC2) are commonly identified as negative for lineage markers and positive for HLA-DR and CD123 expression. More recently, normal blood DC2 were shown also to be positive for BDCA-2 and BDCA-4 antigens. The aim of this study was to evaluate whether BDCA-2 expression on DC2 is impaired in patients undergoing an allogeneic hematopoietic stem cell transplantation (HSCT) and in healthy donors treated with G-CSF for HSC mobilization. Flow cytometry assays for DC2 detection using either a triple staining with anti-HLA-DR PerCP, anti-Lin+ anti-CD34 FITC and anti-CD123 PE monoclonal antibodies (mAbs), or a double staining with anti-HLA-DR PE and anti-BDCA-2 FITC mAbs were compared in blood samples from patients who underwent an allogeneic HSCT (n = 30) or from healthy donors before (n = 11) and after (n = 8) G-CSF mobilization, as well as in healthy donors’ leukapheresis products (n = 12) or bone marrow (n = 4). Staining of BDCA-2+ cells with other markers such as anti-CD38, anti-CD54 and anti-CD58 were also performed. Median values of CD123+ DC2 and BDCA-2+ DC2 were not statistically different in the blood of patients previously treated with chemotherapy, nor in the blood or bone marrow of heathy donors. Also, a 5 day G-CSF treatment did not affect BDCA-2 or adhesion molecule expression on healthy donors’ blood DC2 significantly. A correlation between all the results (n = 65) obtained with the two assays was demonstrated in a linear regression curve (r = 0.914) (P = 0.00001). BDCA-2 is a marker highly specific for DC2 that is not downregulated by chemotherapy or G-CSF treatment. Therefore, the anti-BDCA-2 mAb can be efficiently combined with other mAbs and used in studies addressing the role of DC2 in the allogeneic HSCT setting.
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Acknowledgements
Anti-BDCA-2 mAb was kindly provided by Dr Juergen Schmitz (Miltenyi Biotec, Bergisch Gladbach, Germany). This research was partly supported by grants from MURST (Rome, Italy), Fondazione CARISBO (Bologna, Italy) and Associazione Italiana contro le Leucemie – Progetto Trenta Ore Per La Vita 2000 (Rome, Italy) to DR.
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Arpinati, M., Chirumbolo, G., Urbini, B. et al. Use of anti-BDCA-2 antibody for detection of dendritic cells type-2 (DC2) in allogeneic hematopoietic stem cell transplantation. Bone Marrow Transplant 29, 887–891 (2002). https://doi.org/10.1038/sj.bmt.1703569
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DOI: https://doi.org/10.1038/sj.bmt.1703569
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