Origin of the lamina propria dendritic cell network
Milena Bogunovic1, Florent Ginhoux, Julie Helft
1Department of Gene and Cell Medicine, Mount Sinai School of Medicine, 1425 Madison Avenue, New York, NY 10029, USA.
Immunity
|September 8, 2009
Summary
Monocytes differentiate into CD103(-)CX(3)CR1(+) dendritic cells (DCs), while pre-DCs give rise to CD103(+)CX(3)CR1(-) DCs. The latter are crucial for mucosal immunity and pathogen transport in the gut.
Area of Science:
- Immunology
- Cell Biology
- Gastroenterology
Background:
- Intestinal lamina propria dendritic cells (DCs) are vital for mucosal immunity.
- The developmental origins and differentiation pathways of these DCs remain largely unknown.
Purpose of the Study:
- To elucidate the distinct developmental origins of CD103(+)CX(3)CR1(-) and CD103(-)CX(3)CR1(+) DCs in the intestinal lamina propria.
- To identify the key signaling pathways regulating their differentiation.
Main Methods:
- Flow cytometry and lineage tracing experiments.
- Cytokine receptor signaling pathway analysis (M-CSFR, Flt3, GM-CSFR).
- In vivo Salmonella transport assays.
Main Results:
- Monocytes differentiate into CD103(-)CX(3)CR1(+) DCs under M-CSFR and Flt3 signaling.
- Common DC progenitors (CDP) and pre-DCs differentiate into CD103(+)CX(3)CR1(-) DCs under Flt3 and GM-CSFR signaling.
- CD103(+)CX(3)CR1(-) DCs constitutively express CCR7 and are the primary transporters of Salmonella to mesenteric lymph nodes.
Conclusions:
- The intestinal lamina propria DC network arises from diverse progenitor populations.
- Mucosal DCs originating from pre-DCs are critical sentinels of the gut immune system, involved in early pathogen detection and transport.
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