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Updated: Jun 20, 2026
Generation of Human Monocyte-derived Dendritic Cells from Whole Blood
Published on: December 24, 2016
CD56+ human blood dendritic cells effectively promote TH1-type gammadelta T-cell responses
Georg Gruenbacher1, Hubert Gander, Andrea Rahm
1Cell Therapy Unit, Department of Urology, Innsbruck Medical University, Innsbruck, Austria.
Insights
Newly identified CD56+ dendritic cells (DCs) in human blood can stimulate CD56+ gammadelta T cells. These cells, originating from monocytes, show potential for immunotherapy applications by producing key cytokines like IFN-gamma.
Area of Science:
- Immunology
- Cell Biology
- Dendritic Cell Research
Background:
- CD56+ human dendritic cells (DCs) are known to differentiate from monocytes in vitro.
- Freshly isolated CD56+ peripheral blood cells contain a subset of intermediate-sized cells with DC-like characteristics.
Purpose of the Study:
- To investigate the differentiation potential and functional capacity of CD56+ cells from human peripheral blood.
- To explore the interaction between CD56+ DCs and CD56+ gammadelta T cells.
Main Methods:
- Isolation and characterization of CD56+ cells from human peripheral blood.
- In vitro culture with cytokines to induce DC differentiation.
- Stimulation with zoledronate and IL-2 to assess T cell responses.
- Cytokine profiling (IFN-gamma, TNF-alpha, IL-1beta, IL-4, IL-10, IL-17, IL-6).
- Cell depletion experiments (CD14+ cells).
Main Results:
- CD56+ cells differentiate into DC-like cells and mature CD83+ DCs.
- Stimulation with zoledronate and IL-2 induces gammadelta T cell expansion and IFN-gamma, TNF-alpha, IL-1beta production.
- CD14+ cell depletion abrogates gammadelta T cell expansion and cytokine production.
- IL-1beta and TNF-alpha mediate IFN-gamma production, with IL-6 production enhanced by these cytokines.
Conclusions:
- Human blood CD56+ DCs stimulate CD56+ gammadelta T cells.
- CD14+ cells are crucial for this interaction and subsequent cytokine production.
- This CD56+ DC-gammadelta T cell axis holds potential for immunotherapy.
Abstract:
CD56+ human dendritic cells (DCs) have recently been shown to differentiate from monocytes in response to GM-CSF and type 1 interferon in vitro. We show here that CD56+ cells freshly isolated from human peripheral blood contain a substantial subset of CD14+CD86+HLA-DR+ cells, which have the appearance of intermediate-sized lymphocytes but spontaneously differentiate into enlarged DC-like cells with substantially increased HLA-DR and CD86 expression or into fully mature CD83+ DCs in response to appropriate cytokines. Stimulation of CD56+ cells containing both DCs and abundant gammadelta T cells with zoledronate and interleukin-2 (IL-2) resulted in the rapid expansion of gammadelta T cells as well as in IFN-gamma, TNF-alpha, and IL-1beta but not in IL-4, IL-10, or IL-17 production. IFN-gamma, TNF-alpha, and IL-1beta production were almost completely abolished by depleting CD14+ cells from the CD56+ subset before stimulation. Likewise, depletion of CD14+ cells dramatically impaired gammadelta T-cell expansion. IFN-gamma production could also be blocked by neutralizing the effects of endogenous IL-1beta and TNF-alpha. Conversely, addition of recombinant IL-1beta, TNF-alpha, or both further enhanced IFN-gamma production and strongly up-regulated IL-6 production. Our data indicate that CD56+ DCs from human blood are capable of stimulating CD56+ gammadelta T cells, which may be harnessed for immunotherapy.
