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[Differentiation and function of human monocytes]
1Department of Immunology, National Institute of Health Science, Tokyo, Japan.
Abstract:
We found that human monocytes differentiate into macrophages (Mp) by GM-CSF and M-CSF. The Mp induced by GM-CSF and M-CSF are different in their morphology, cell surface antigen expression and functions. In the course of that study, we found that IL-4 modulate the differentiation of monocytes induced by GM-CSF and M-CSF. IL-4 alone did not induce the proliferation and differentiation of monocytes. IL-4, however, inhibited the proliferative response of monocytes to GM-CSF. When monocytes were incubated with GM-CSF and IL-4 simultaneously, the cells recovered were non-adherent, non-phagocytic, and did not form rosette with EA. The cells were also negative in nonspecific esterase and showed an appearance of dendritic cells (DC). The DC-like cells expressed CD1, DR, DQ and CD11c, but not CD14, CD71 and 710F. The cells showed strong APC activity in alogeneic and autologous mixed lymphocyte reaction (MLR). When monocytes were incubated with M-CSF and IL-4, TRAP positive multinucleated giant cells appeared. Taken together, these results suggest that IL-4 is a principal factor that control the differential development of human monocytes into DC and multinucleated giant cells.
Insights
Interleukin-4 (IL-4) directs human monocyte differentiation into dendritic cells (DC) or multinucleated giant cells, depending on the co-stimulatory cytokine. IL-4 modulates responses to GM-CSF and M-CSF.
Area of Science:
- Immunology
- Cell Biology
Context:
- Human monocytes are precursors to various immune cells, including macrophages, dendritic cells, and multinucleated giant cells.
- Cytokines like GM-CSF, M-CSF, and IL-4 play critical roles in regulating monocyte differentiation and function.
Purpose:
- To investigate the role of IL-4 in modulating human monocyte differentiation induced by GM-CSF and M-CSF.
- To characterize the distinct cell types generated under different cytokine combinations.
Summary:
- GM-CSF and M-CSF induce distinct macrophage phenotypes.
- IL-4 alone does not induce monocyte proliferation or differentiation but inhibits GM-CSF-induced proliferation.
- Co-incubation of monocytes with GM-CSF and IL-4 generates dendritic cell (DC)-like cells with potent antigen-presenting cell (APC) activity.
- Co-incubation with M-CSF and IL-4 results in the formation of TRAP-positive multinucleated giant cells.
Impact:
- IL-4 is identified as a key regulator controlling the lineage commitment of human monocytes towards DC or multinucleated giant cells.
- These findings enhance our understanding of immune cell differentiation pathways.
- Provides insights into the development of specific immune cell types for therapeutic applications.