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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes
Published on: June 22, 2016
NKT cells direct monocytes into a DC differentiation pathway
Subramanya Hegde1, Xiuxu Chen, Jason M Keaton
1Department of Medical Microbiology and Immunology, University of Wisconsin Medical School, 1300 University Ave., Madison, WI 53705, USA.
Journal of Leukocyte Biology
|February 22, 2007
Summary
Natural killer T (NKT) cells direct monocytes to become immature dendritic cells (DCs). This CD1d-dependent process involves NKT cell secretion of GM-CSF and IL-13, potentially maintaining DC populations in vivo.
Area of Science:
- Immunology
- Cell Biology
Background:
- Monocytes differentiate into macrophages or dendritic cells (DCs), but the regulatory mechanisms are unclear.
- NKT cells are regulatory T cells that recognize CD1d-presented antigens and can exhibit autoreactivity.
- The consequences of NKT cell autoreactivity on monocyte differentiation are poorly understood.
Purpose of the Study:
- To investigate the role of NKT cells in directing monocyte differentiation.
- To determine the mechanisms underlying NKT cell-induced monocyte differentiation.
- To explore the in vivo relevance of NKT cell autoreactivity in monocyte differentiation.
Main Methods:
- Co-culture of human NKT cells with autologous monocytes.
- Assessment of monocyte differentiation into dendritic cells (DCs).
- Analysis of cytokine production (GM-CSF, IL-13) by NKT cells.
- CD1d dependency assays.
Main Results:
- Human NKT cells induce monocytes to differentiate into immature DCs.
- This differentiation is CD1d-dependent and specific to NKT cells.
- NKT cells secrete GM-CSF and IL-13 upon autoreactive activation by monocytes, driving DC differentiation.
- Evidence suggests this autoreactive response occurs in vivo.
Conclusions:
- Autoreactively activated NKT cells direct monocyte differentiation into immature DCs via GM-CSF and IL-13.
- NKT cells may contribute to maintaining the immature DC pool.
- Inflammatory conditions or infections could enhance NKT cell-driven DC differentiation.
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