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Visualization of IL-22-expressing Lymphocytes Using Reporter Mice
Published on: January 25, 2017
Spotlight on IL-22-producing NK cell receptor-expressing mucosal lymphocytes
Karl-Johan Malmberg1, Hans-Gustaf Ljunggren
1Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, S-14186 Stockholm, Sweden.
Nature Immunology
|December 18, 2008
Summary
Researchers discovered a unique group of innate immune cells in the gut lining. These cells, expressing ROR gamma t (RORγt), also have natural killer cell receptors and produce interleukin 22, potentially crucial for mucosal health.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- Mucosal surfaces are critical barriers requiring precise immune regulation.
- Innate lymphoid cells (ILCs) play key roles in mucosal immunity.
- ROR gamma t (RORγt) is a transcription factor essential for the development of certain ILC subsets.
Purpose of the Study:
- To investigate the characteristics of RORγt-expressing cells in the mucosal immune system.
- To identify novel immune cell populations involved in maintaining gut homeostasis.
Main Methods:
- Flow cytometry to identify cell populations based on surface markers and intracellular cytokine production.
- Analysis of gene and protein expression in isolated mucosal cell subsets.
Main Results:
- A distinct subpopulation of mucosal RORγt+ cells was identified.
- These cells co-expressed natural killer cell receptors (e.g., NKp46).
- The identified cells were found to produce interleukin 22 (IL-22).
Conclusions:
- Mucosal RORγt+ cells represent a unique innate immune cell subset with characteristics of both ILCs and natural killer cells.
- The production of IL-22 by these cells suggests a significant role in mucosal barrier function and homeostasis.
- These findings highlight a novel cellular mechanism for maintaining mucosal integrity.
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