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The Journal of Immunology, 2001, 167: 1954-1961.
Copyright © 2001 by The American Association of Immunologists

Development of the Thymus Requires Signaling Through the Fibroblast Growth Factor Receptor R2-IIIb

Jean-Michel Revest1,*, Ravinder K. Suniara{dagger}, Karen Kerr*, John J. T. Owen{dagger} and Clive Dickson2,*

* Imperial Cancer Research Fund, London, U.K.; and {dagger} Department of Anatomy, Medical School, University of Birmingham, Birmingham, United Kingdom.

Mice deficient for fibroblast growth factor (Fgf)R2-IIIb show a block in thymic growth after embryonic day 12.5, a stage that just precedes its detection in thymic epithelial cells. Fgf7 and Fgf10, the main ligands for FgfR2-IIIb, are expressed in the mesenchyme surrounding the thymic epithelial primordium, and Fgf10-deficient mice also exhibit impaired thymic growth. Hence, Fgf signaling is essential for thymic epithelial proliferation. In addition to the proliferative block, most thymic epithelial cells fail to progress from an immature cytokeratin 5-positive to a cytokeratin 5-negative phenotype. Nevertheless, sufficient epithelial cell differentiation occurs in the severely hypoplastic thymus to allow the development of CD4/CD8-double-positive thymocytes and a very small number of single-positive thymocytes expressing TCRs.




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