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Published on: June 22, 2016
Development of a Langerhans cell phenotype from peripheral blood monocytes
1Institut für Molekularbiologie und Biochemie, Freie Universität Berlin, F.R.G.
Insights
Peripheral blood monocytes can develop into Langerhans cells (LC) and dendritic cells (DC) through autocrine stimulation in vitro. This process involves specific cell surface marker changes and functional acquisition, suggesting monocytes are primed early for LC-DC lineage differentiation.
Area of Science:
- Immunology
- Cell Biology
- Dendritic Cell Differentiation
Background:
- Epidermal Langerhans cells (ELC) are precursors to dendritic cells (DC).
- The precise stage of monocyte development where LC-DC lineage priming occurs remains unclear.
- Monocytes possess mannose receptors, suggesting potential for specific ligand interactions.
Purpose of the Study:
- To investigate the differentiation potential of peripheral blood monocytes towards the LC-DC lineage in a low paracrine stimulation environment.
- To identify the key phenotypic and functional changes during monocyte differentiation into LC-like cells.
- To determine the role of autocrine stimulation in this differentiation process.
Main Methods:
- Culturing peripheral blood monocytes in Iscove's modified Dulbecco medium (IMDM) with 2% FCS.
- Analyzing cell phenotype using flow cytometry with monoclonal antibodies (OKT6/CD1a, IOT2/HLA-DR, IOM2/CD14) and mannose receptor binding (Man-BSA-FITC).
- Assessing T cell proliferation stimulation by mannan-specific T cells and evaluating macrophage conversion with human serum.
Main Results:
- Monocytes cultured in low serum conditions did not exhibit significant yeast phagocytosis but stimulated mannan-specific T cell proliferation.
- CD1a expression emerged as an early marker distinguishing differentiating monocytes from macrophages.
- Cultured monocytes (MoLC) maintained an LC phenotype (CD1a+, mannose receptor+, HLA-DR+, decreasing CD14) for eight days, internalizing OKT6 similarly to cord blood Langerhans cells (CBLC).
- Macrophage conversion was only possible within the first four days of culture.
Conclusions:
- Peripheral blood monocytes can acquire an LC phenotype through autocrine stimulation in vitro.
- This differentiation pathway suggests monocytes are primed early for the LC-DC lineage.
- The findings provide insights into the developmental plasticity of monocytes and their potential to differentiate into specialized immune cells.
Abstract:
Epidermal Langerhans cells (ELC) are definitively primed to differentiate into dendritic cells (DC). It is unknown at what stage of monocyte development this priming occurs. In a culture system characterized by low paracrine stimulation, i.e. Iscove's modified Dulbecco medium (IMDM) with 2% FCS, we tested the ability of peripheral blood monocytes to turn to the route of the LC-DC lineage. In this system monocytes did not develop significant yeast cell phagocytosis, although mannose receptors were available. However, they became strong stimulators of mannan specific T cell proliferation. Phenotype development was analysed by flow cytometry using the monoclonal antibodies OKT6 (CD1a), IOT2 (HLA-DR), IOM2 (CD14) and the ligand Man-BSA-FITC. CD1a was the first marker which distinguished cultured monocytes from developing macrophages, obtained by addition of 8% human serum. Like cord blood Langerhans cells (CBLC) they internalized OKT6 in deep coated pits. They maintained a phenotype of monocyte derived Langerhans cells (MoLC) during eight days of in vitro culture, expressing CD1a, mannose receptors and HLA-DR and decreasing CD14, if left in their own conditioned medium. MoLC could be converted into macrophages by addition of human serum only within the first four days in vitro. Our data suggest that monocytes acquire an LC phenotype by autocrine stimulation.
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