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The Journal of Immunology, 2004, 173: 113-122.
Copyright © 2004 by The American Association of Immunologists

Lymphomagenesis, Hydronephrosis, and Autoantibodies Result from Dysregulation of IL-9 and Are Differentially Dependent on Th2 Cytokines1

Angus J. Lauder*, Helen E. Jolin*, Philippa Smith*, José G. van den Berg{dagger}, Alison Jones*, William Wisden2,*, Kenneth G. C. Smith{ddagger}, Ayan Dasvarma*, Padraic G. Fallon§ and Andrew N. J. McKenzie3,*

* Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom; {dagger} Department of Pathology, Academic Medical Center, Amsterdam, The Netherlands; {ddagger} Cambridge Institute for Medical Research and Department of Medicine, University of Cambridge School of Clinical Medicine, Addenbrooke’s Hospital, Cambridge, United Kingdom; and § Immunomodulation Group, Department of Biochemistry, Trinity College, Dublin, Ireland

Interleukin-9 is an immunoregulatory cytokine implicated in the development of asthma and allergy. To investigate the role of IL-9 in vivo, we have generated transgenic mice in which IL-9 is expressed from its own promoter. Strikingly, overexpression of IL-9 resulted in premature mortality associated with a complex phenotype characterized by the development of autoantibodies, hydronephrosis, and T cell lymphoma. By intercrossing IL-9 transgenic mice with a panel of Th2 cytokine-deficient mice, we demonstrate that these disorders represent distinct phenotypes that can be dissociated by their differential dependence on Th2 cytokines. Autoantibody production was ablated in IL-9 transgenic animals with a combined absence of IL-4, IL-5, and IL-13, coincident with a reduction in peritoneal B-1 cells. Hydronephrosis arose in 75% of IL-9 transgenic animals and was dependent on the presence of IL-4 and IL-13. In contrast, T cell lymphomas developed independently of the other Th2 cytokines, with the generation of rapidly proliferating CD8+ or CD4+CD8+ T cell clones that arose in the thymus before infiltrating both lymphoid and nonlymphoid tissues. Our data highlight potentially important new roles for IL-9, through its regulation of downstream Th2 effector cytokines, in autoantibody production and in hydronephrosis.




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