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Updated: Jul 31, 2026
Characterization of Human Monocyte-derived Dendritic Cells by Imaging Flow Cytometry: A Comparison between Two Monocyte Isolation Protocols
Published on: October 18, 2016
Functional and structural characterization of two populations of human monocyte-derived dendritic cells
1Hematology-Oncology Section, Department of Medicine, University of Illinois at Chicago, 900 S. Ashland Avenue, Chicago, IL 60607, USA. rafaelnr@uic.edu
Insights
Researchers identified distinct human monocyte-derived dendritic cell (HM-DC) subsets, Mo-DC and Mo-LC, based on TGF-beta1 presence, Birbeck granuli, and cell division capabilities, revealing key antigenic and functional differences.
Area of Science:
- Immunology
- Cell Biology
Background:
- Characterizing human monocyte-derived dendritic cell (HM-DC) subsets is challenging due to limited reagents.
- Diverse approaches including flow cytometry, electron microscopy, and functional assays were used to evaluate HM-DC populations.
- Kinetics of antigen expression and identification of surface markers for HM-DC subsets were investigated.
Purpose of the Study:
- To differentiate and characterize distinct subsets of human monocyte-derived dendritic cells (HM-DC).
- To identify specific surface markers and functional differences between these HM-DC subsets.
- To investigate the role of TGF-beta1 in HM-DC subset formation and characteristics.
Main Methods:
- Flow cytometry analysis of HM-DC populations.
- Ultra-structural evaluation using electron microscopy.
- Functional assays assessing cell division and antigen expression kinetics.
Main Results:
- HM-DC separated into two subsets based on TGF-beta1: Mo-DC (no Birbeck granuli) and Mo-LC (with Birbeck granuli).
- Mo-LC, treated with TGF-beta1, exhibited Birbeck granuli and active cell division, further splitting into high and normal FSC subgroups.
- Mo-DC, cultured without TGF-beta1, lacked Birbeck granuli, showed reduced division, and maintained normal FSC.
Conclusions:
- Confirmed antigenic and functional differences between Mo-DC and Mo-LC subpopulations.
- Identified distinct kinetics of antigen expression among HM-DC subsets.
- Established specific surface markers for differentiating HM-DC subpopulations.
Background:
The characterization of human monocyte-derived dendritic cells (HM-DC) subsets have been a very difficult and elusive task because of the lack of appropriate reagents. We, therefore utilized several diverse approaches to evaluate two populations of HM-DC including flow cytometry, ultra-structural evaluation by electron microscopy, and functional assays. In addition, we studied the kinetics of the expression of antigens on HM-DC at diverse intervals of time and identify surface markers and functional differences of these two HM-DC subsets.
Results:
This study identified that a phenotype of HM-DC as defined by CD11c+, CD86+, and CD40+ could be separated in the presence or absence of TGF-beta1 into two different subsets of DC: (i) HM-DC without Birbeck granuli (Mo-DC) and (ii) HM-DC with Birbeck granuli (Mo-LC). Furthermore, the functional studies showed that the HM-DC treated with TGF-beta1 (Mo-LC) exhibited the presence of Birbeck granuli and could actively divide. In addition, after undergoing more than four cell divisions, these cells split into at least two additional subsets of Mo-LC: (iia) Mo-LC with high forward scatter (FSC) and (iib) Mo-LC with normal FSC. In contrast, the Mo-DC cultured in absence of TGF-beta1 did not exhibit Birbeck granuli, showed reduced ability to divide, and kept the normal FSC when analyzed.
Conclusions:
This study enabled us to determine in HM-DC: (i) the existence of antigenic and functional differences between various subpopulations of Mo-DC and Mo-LC; (ii) the existence of differences in the kinetics of antigens expression among the subsets of Mo-DC and Mo-LC; (iii) the existence of specific markers for each of the subpopulations of HM-DC.
