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TSLP expression: analysis with a ZsGreen TSLP reporter mouse
Cedric Dewas1, Xi Chen1, Tetsuya Honda2
1Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892;
Journal of Immunology (Baltimore, Md. : 1950)
|December 26, 2014
Summary
Researchers developed a reporter mouse to track thymic stromal lymphopoietin (TSLP) expression. This tool revealed that TNF-α and IL-4/IL-13 activate keratinocytes to produce TSLP, potentially amplifying allergic inflammation.
Area of Science:
- Immunology
- Allergy Research
- Molecular Biology
Background:
- Thymic stromal lymphopoietin (TSLP) is a key cytokine in allergic inflammation.
- Epithelial cells are a primary source of TSLP, targeting dendritic cells and CD4 T cells.
- Understanding TSLP's regulation is crucial for developing allergy treatments.
Purpose of the Study:
- To develop a reporter mouse model for visualizing TSLP expression in vivo.
- To identify specific inducers of TSLP production in epithelial cells.
- To investigate the potential role of TSLP in positive feedback loops during allergic responses.
Main Methods:
- Development of a TSLP-ZsGreen (ZsG) reporter mouse using bacterial artificial chromosome recombineering.
- Analysis of ZsG expression as a surrogate for TSLP expression in various cell types.
- Investigating the effects of TNF-α, IL-4/IL-13, and T-cell activation on keratinocyte TSLP production.
Main Results:
- The TSLP-ZsG reporter mouse accurately reflects TSLP expression, particularly in keratinocytes and thymic epithelial cells.
- Tumor necrosis factor-alpha (TNF-α) and interleukins 4/13 (IL-4/IL-13) strongly induce TSLP expression in keratinocytes.
- Activated Th2 and Th1 cells can induce TSLP expression in keratinocytes.
Conclusions:
- TSLP-ZsG reporter mice provide a valuable tool for studying TSLP biology.
- Keratinocyte TSLP production is regulated by inflammatory signals like TNF-α and Th2 cytokines.
- TSLP may contribute to sustained allergic inflammation through a positive feedback loop involving Th2 cells.
