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Isolation of Myeloid Dendritic Cells and Epithelial Cells from Human Thymus
Published on: September 19, 2013
A discrete population of IFN λ-expressing BDCA3hi dendritic cells is present in human thymus
Víctor G Martínez1, Noelia M Canseco1, Laura Hidalgo1
1Department of Cell Biology, Faculty of Medicine, Complutense University, Madrid, Spain.
Insights
Researchers identified a new population of BDCA3(hi) dendritic cells (DCs) in the human thymus. These cells, similar to peripheral counterparts, play a role in thymus protection against viral infections.
Area of Science:
- Immunology
- Cell Biology
Background:
- The human thymus hosts conventional dendritic cells (cDCs) and plasmacytoid dendritic cells (pDCs) crucial for immune tolerance and infection defense.
- Peripheral cDCs include BDCA3(hi) DCs, analogous to mouse CD8α(+) DCs.
Purpose of the Study:
- To identify and characterize BDCA3(hi) DCs within the human thymus.
- To investigate the functional role of thymic BDCA3(hi) DCs in immune responses.
Main Methods:
- Flow cytometry and immunophenotyping of human thymic cell populations.
- Analysis of gene and protein expression markers (CD13, CD11c, CLEC9A, XCR1, IRF8, TLR3, CD11b, CD14, TLR7).
- Assessment of costimulatory molecule expression, HLA-DR levels, and allostimulatory capacity.
- Evaluation of responses to Toll-like receptor 3 (TLR3) stimulation.
Main Results:
- A distinct population of BDCA3(hi) DCs was identified in the human thymus.
- These thymic BDCA3(hi) DCs express specific markers (CD13, low-intermediate CD11c, CLEC9A, high XCR1, IRF8, TLR3) and lack others (CD11b, CD14, TLR7).
- Thymic BDCA3(hi) DCs exhibit immature features, low allostimulatory capacity, and a robust response to TLR3 stimulation, producing interferon-λ1 and CXCL10.
Conclusions:
- Thymic BDCA3(hi) DCs represent a unique subset with characteristics similar to peripheral BDCA3(hi) DCs.
- These cells possess immature features but are equipped to respond to viral infections via TLR3 signaling.
- BDCA3(hi) DCs likely contribute to thymus protection against viral pathogens, similar to thymic pDCs.
Abstract:
Human thymus contains two major subpopulations of dendritic cells (DCs), conventional DCs (cDCs) and plasmacytoid DCs (pDCs), which are mainly involved in central tolerance and also in protecting the thymus against infections. In blood and peripheral organs cDCs include the subpopulation of BDCA3(hi) DCs, considered as equivalents to mouse CD8α(+) DCs. In this study we describe in human thymus the presence of a discrete population of BDCA3(hi) DCs that, like their peripheral counterparts, express CD13, low-intermediate levels of CD11c, CLEC9A, high levels of XCR1, IRF8 and TLR3, and mostly lack the expression of CD11b, CD14 and TLR7. Thymic BDCA3(hi) DCs display immature features with a low expression of costimulatory molecules and HLA-DR, and a low allostimulatory capacity. Also, BDCA3(hi) DCs exhibit a strong response to TLR3 stimulation, producing high levels of interferon (IFN)-λ1 and CXCL10, which indicates that, similarly to thymic pDCs, BDCA3(hi) DCs can have an important role in thymus protection against viral infections.
