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Updated: Jul 10, 2026
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Evaluation of T Follicular Helper Cells and Germinal Center Response During Influenza A Virus Infection in Mice
Published on: June 27, 2020
FGFR2IIIb signaling regulates thymic epithelial differentiation.
James Dooley1, Matthew Erickson, William J Larochelle
1Department of Biological Structure, University of Washington, Seattle, Washington 98195-7420, USA.
Summary
Fibroblast growth factor (FGF) signals, specifically FGF10, are crucial for maintaining thymic epithelium (TE) structure and function. Disrupting FGF signaling accelerates thymic aging and alters T-cell development.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- The thymic microenvironment, composed of heterogeneous epithelial cells, is critical for T-cell development.
- The molecular mechanisms regulating thymic epithelial cell (TEC) differentiation and heterogeneity remain largely unknown.
- Mesenchymal-epithelial interactions are implicated in thymic development.
Purpose of the Study:
- To investigate the role of fibroblast growth factor 10 (FGF10) in thymic epithelial cell (TEC) differentiation and function.
- To elucidate the impact of FGF10-fibroblast growth factor receptor-2IIIb (FGFR2IIIb) signaling on thymic organogenesis and T-cell development.
- To determine the contribution of FGF signaling to thymic involution.
Main Methods:
- Genetic manipulation to achieve targeted expression of FGF10 in thymocytes (lckFGF10 mice).
- Bone marrow reconstitution experiments using wild-type and lckFGF10 mice.
- In vivo inhibition of FGFR2IIIb signaling using a dominant-negative fusion protein.
- Assessment of thymic size, cellularity, and T-cell development markers.
Main Results:
- Targeted FGF10 expression in thymocytes profoundly altered thymic epithelial cell differentiation and function.
- Bone marrow reconstitution studies indicated a reciprocal influence between thymocytes and thymic epithelium.
- Interference with FGFR2IIIb signaling mimicked age-related thymic involution, causing reduced thymic size and cellularity.
- FGF signaling was identified as a key regulator of thymic epithelial cell compartments.
Conclusions:
- FGF10 signaling plays a significant role in the dynamic maintenance of thymic epithelial cell populations.
- FGF signaling pathways are essential for normal thymic development and function throughout life.
- Dysregulation of FGF signaling contributes to thymic involution and may impact T-cell immunity.
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