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Dendritic cell differentiation signals induce anti-inflammatory properties in human adult microglia
Caroline Lambert1, Julie Desbarats, Nathalie Arbour
1Physiology Department, Montreal Neurology Institute, McGill University, Montréal, Québec, Canada.
Abstract:
Microglia are resident cells of the CNS that belong to the myeloid cell lineage. In experimental models of neuroinflammation, they have limited capacity to function as APCs when compared with dendritic cells (DCs). Human peripheral blood monocytes have the plasticity to differentiate into mature DCs when exposed to GM-CSF and IL-4 followed by LPS. In this study we addressed the potential of human microglia to acquire phenotypic and functional properties of mature DCs under similar inducing conditions. Treated adult and fetal microglia became CD14(low) and acquired limited expression of CD209 (DC-SIGN); they remained CD1a(-) and CD83(-), and decreased MHCII expression, suggesting that they had not achieved a complete DC phenotype. The monocyte-derived DCs efficiently promoted CD4 T cell proliferation in an allogeneic MLR, whereas differentiated adult microglia had a decreased ability to stimulate CD4 T cell proliferation compared with their untreated counterparts. Differentiated fetal microglia did support CD4 T cell proliferation, whereas untreated cells could not. Fetal and adult microglia produced significant amounts of IL-10 following differentiation but no detectable IL-12 p70, in contrast to differentiated monocytes that produced IL-12 p70. Our data indicate that neither adult nor fetal microglia acquired the full characteristic phenotype of mature stimulatory DCs when treated with DC-inducing cytokines in vitro. Moreover, such treatment, especially of adult microglia, induces functional responses that could promote an antiinflammatory environment in the CNS.
Insights
Human microglia, the brain's immune cells, do not fully mature into dendritic cells (DCs) when treated with specific cytokines. This treatment may promote an anti-inflammatory environment in the central nervous system (CNS).
Area of Science:
- Neuroimmunology
- Cellular immunology
- Central nervous system (CNS) research
Background:
- Microglia are myeloid-derived immune cells residing in the CNS.
- In neuroinflammation models, microglia exhibit limited antigen-presenting cell (APC) capacity compared to dendritic cells (DCs).
- Human monocytes can differentiate into mature DCs under specific cytokine and lipopolysaccharide (LPS) stimulation.
Purpose of the Study:
- To investigate whether human microglia can acquire phenotypic and functional characteristics of mature DCs.
- To compare the differentiation potential of adult and fetal microglia versus peripheral blood monocytes.
Main Methods:
- Human adult and fetal microglia were cultured with granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-4 (IL-4), and LPS.
- Phenotypic analysis included assessing expression of CD14, CD209 (DC-SIGN), CD1a, CD83, and MHCII.
- Functional assessment involved mixed lymphocyte reactions (MLRs) to evaluate CD4 T cell proliferation and cytokine production (IL-10, IL-12 p70).
Main Results:
- Treated microglia showed reduced CD14 expression and limited CD209 induction but lacked CD1a and CD83 expression, indicating an incomplete DC phenotype.
- MHCII expression decreased in treated microglia.
- Monocyte-derived DCs effectively stimulated CD4 T cell proliferation, while differentiated adult microglia showed reduced stimulation.
- Differentiated fetal microglia supported CD4 T cell proliferation, unlike untreated fetal microglia.
- Both adult and fetal microglia produced IL-10 but not IL-12 p70 after differentiation, contrasting with IL-12 p70 production by differentiated monocytes.
Conclusions:
- Neither adult nor fetal human microglia achieve a full mature, stimulatory DC phenotype upon in vitro treatment with DC-inducing cytokines.
- The differentiation process, particularly in adult microglia, may induce functional responses that contribute to an anti-inflammatory CNS environment.
- Microglia possess distinct differentiation potentials compared to peripheral monocytes.
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