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Lymphoid tissue inducer cells in intestinal immunity.

I I Ivanov1, G E Diehl, D R Littman

  • 1Howard Hughes Medical Institute, Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016, USA.

Current Topics in Microbiology and Immunology
|August 23, 2006
PubMed
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Lymphoid tissue inducer cells (LTis) and RORgammat are crucial for developing immune organs and gut-associated lymphoid tissue (GALT). Their interaction with dendritic cells (DCs) in the gut influences immune homeostasis and disease.

Area of Science:

  • Immunology
  • Developmental Biology
  • Microbiology

Background:

  • Lymphoid tissue inducer cells (LTis) are essential for initiating lymphoid organ formation during fetal development.
  • Lymphoid tissue inducer-like cells (LTi-like cells) maintain organized gut-associated lymphoid tissue (GALT) in adults.
  • RORgammat is a key transcription factor required for the differentiation and function of both LTis and LTi-like cells.

Purpose of the Study:

  • To investigate the role of LTi-like cells and their interaction with dendritic cells (DCs) in the adult gut.
  • To understand the mechanisms underlying the formation and maintenance of organized GALT, including isolated lymphoid follicles (ILFs) and cryptopatches (CPs).
  • To explore the implications of these cellular interactions for maintaining intestinal homeostasis and in the context of infectious diseases like HIV.

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Main Methods:

  • Analysis of RORgammat-deficient mice to assess the necessity of this transcription factor for lymphoid organ development.
  • Microscopic examination of LTi-like cells and dendritic cells (DCs) in the lamina propria of the intestine.
  • Discussion of potential functional implications based on observed cellular organization and interactions.

Main Results:

  • Mice lacking RORgammat are devoid of lymph nodes, Peyer's patches, and organized GALT.
  • LTi-like cells in ILFs and CPs are in close proximity to intestinal DCs, including those that sample luminal microflora.
  • This close contact suggests a potential pathway for communication between the gut lumen and the lamina propria immune system.

Conclusions:

  • RORgammat is indispensable for the development of key lymphoid structures in both fetal and adult stages.
  • The interaction between LTi-like cells and specific DC subsets in the gut lamina propria is critical for immune homeostasis.
  • Understanding these interactions may provide insights into managing infectious diseases and maintaining gut health.