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Updated: Jun 28, 2026
Generation of Human Monocyte-derived Dendritic Cells from Whole Blood
Published on: December 24, 2016
Differentiation of monocyte-derived dendritic cells under the influence of platelets
X D Nguyen1, J Müller-Berghaus, T Kälsch
1Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, Red-Cross Blood Donation Service of Baden-Wurttemberg-Hessen, Germany. x.nguyen@blutspende.de
Background:
Monocytapheresis has been established to collect a sufficient number of monocytes (MO) for differentiation to dendritic cells (DC) as a cancer vaccine. Platelets (Plt) are invariably found as a contaminant in the final monocytapheresis product. The aim of this study was to investigate DC differentiation under the influence of Plt with regard to their function and phenotype.
Methods:
MO were isolated and co-cultured with autologous Plt at different MO:Plt ratios (1:1.7, 1:5, 1:15, 1:45 and 1:135) in the presence of interleukin-4 (IL-4) and granulocyte-macrophage colony-stimulating factor (GM-CSF). IL-12p70 release after ligation of CD40L was determined in the supernatant by enzyme-linked immunosorbent assay (ELISA). For T-cell stimulation, tetanus toxoid was added to immature DC and maturation was induced by adding cytokines (IL-1beta, IL-6, tumor necrosis factor-alpha and prostaglandin E(2)). Stimulated T cells were analyzed for activation and proliferation as well as for intracellular cytokines by flow cytometry.
Results:
All DC cultures were strongly positive for CD83. At a contaminating concentration of 5 Plt/MO, matured DC showed the highest expression of HLA-DR, CD80 and CD86, inducing a strong T-cell proliferation with high production of IL-4 and interferon-gamma. The highest level of IL-12p70 production was observed by the same DC group.
Discussion:
Plt did not negatively influence DC maturation but enhanced the expression of co-stimulatory molecules and the release of IL-12. Functionally this was reflected by a strong T-cell response that involved T-helper 1 (Th1)- as well as Th2-biased T cells. Our findings show that controlling the Plt concentration may provide important advantages for the generation of DC for use in immunotherapy.
Insights
Platelets (Plt) contamination in monocyte-derived dendritic cell (DC) production for cancer vaccines does not impair DC function. Optimal Plt levels enhance co-stimulatory molecule expression and IL-12 release, promoting robust T-cell responses.
Area of Science:
- Immunology
- Cancer Vaccine Development
- Cell Therapy
Background:
- Monocytapheresis is used to collect monocytes (MO) for dendritic cell (DC) cancer vaccines.
- Platelets (Plt) are common contaminants in the MO product.
Purpose of the Study:
- To investigate the impact of Plt contamination on DC differentiation, phenotype, and function.
- To determine the optimal Plt concentration for DC generation.
Main Methods:
- MO were co-cultured with autologous Plt at various ratios.
- DC maturation was induced with cytokines (IL-4, GM-CSF).
- IL-12p70 release, co-stimulatory molecule expression (HLA-DR, CD80, CD86), and T-cell responses (proliferation, cytokine production) were analyzed.
Main Results:
- DC cultures were CD83 positive.
- A Plt:MO ratio of 5:1 enhanced HLA-DR, CD80, and CD86 expression.
- This ratio also led to increased IL-12p70 production and robust T-cell proliferation with high IL-4 and interferon-gamma production.
Conclusions:
- Platelets do not negatively affect DC maturation.
- Platelets enhance co-stimulatory molecule expression and IL-12 release.
- Controlling Plt concentration can optimize DC generation for immunotherapy.
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