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Isolation and Characterization of Dendritic Cells and Macrophages from the Mouse Intestine
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Intestinal lamina propria dendritic cell subsets have different origin and functions.

Chen Varol1, Alexandra Vallon-Eberhard, Eran Elinav

  • 1Department of Immunology, The Weizmann Institute of Science, Rehovot, Israel 76100.

Immunity
|September 8, 2009
PubMed
Summary

Dendritic cells (DCs) in the gut lamina propria have distinct origins and functions. Maintaining the balance between CD103(+) and CX(3)CR1(+) lpDCs is crucial for gut homeostasis and preventing inflammation.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • The intestinal immune system requires a balance between tolerance to commensal microbiota and defense against pathogens.
  • Mucosal dendritic cells (DCs) in the lamina propria are key to maintaining this balance, but their specific origins and functions are not fully understood.
  • Understanding lamina propria dendritic cells (lpDCs) is critical for gut homeostasis.

Purpose of the Study:

  • To investigate the distinct origins and functions of lamina propria dendritic cell (lpDC) subsets.
  • To elucidate the cellular pathways and factors involved in lpDC development.
  • To determine the role of lpDC subsets in intestinal inflammation and gut homeostasis.

Main Methods:

  • Conditional cell ablation and precursor-mediated in vivo reconstitution were employed to study lpDC development.
  • Flow cytometry and lineage tracing were used to identify and track lpDC subsets.
  • An innate colitis model was used to assess the function of reconstituted lpDCs in vivo.

Main Results:

  • CD103(+) CX(3)CR1(-) lpDCs originate from macrophage-DC precursors (MDPs) via DC-committed intermediates (pre-cDCs) through a Flt3L-mediated pathway.
  • CD11b(+) CD14(+) CX(3)CR1(+) lpDCs are derived from Ly6C(hi) monocytes, regulated by GM-CSF.
  • Mice reconstituted solely with CX(3)CR1(+) lpDCs exhibited severe intestinal inflammation driven by TNF-alpha-secreting graft-derived cells in a colitis model.

Conclusions:

  • Lamina propria dendritic cell (lpDC) subsets possess distinct developmental origins and functional roles.
  • The balance between different lpDC subsets is essential for maintaining robust gut homeostasis.
  • Dysregulation of lpDC subsets can lead to severe intestinal inflammation, highlighting their critical role in gut immunity.