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International Immunology Advance Access published online on June 7, 2004
International Immunology, doi:10.1093/intimm/dxh105
© 2004 by The Japanese Society for Immunology
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Received March 31, 2004
Accepted April 26, 2004

Article

Tumor cells secreting IL-13 but not IL-13R{alpha}2 fusion protein have reduced tumorigenicity in vivo

Hak-Ling Ma 1, Matthew J. Whitters 1, Bruce A. Jacobson 1, Deborah D. Donaldson 1, Mary Collins 1, Kyriaki Dunussi-Joannopoulos 1*

1 Wyeth Research, 200 Cambridge Park Drive, Cambridge MA 02140, USA

* To whom correspondence should be addressed. E-mail: kdunussi{at}wyeth.com.


  Abstract

IL-13 is a Th2 cytokine that plays crucial roles in the pathophysiology of allergy, asthma and helminth infection. The high affinity receptor for IL-13, IL-13R{alpha}2, may act as a decoy receptor for IL-13. The anti-tumor effect of IL-13 and its soluble receptor IL-13R{alpha}2 have been examined in different tumor systems. Previous studies have shown that IL-13 enhances anti-tumor responses in some model systems, whereas IL-13R{alpha}2Fc prevents IL-13 mediated suppression of tumor immuno-surveillance in a different model system. In this study, we have used a cytokine (receptor) gene therapy approach and studied the immune responses mediated by IL-13 and IL-13R{alpha}2Fc in poorly immunogenic B16F1 melanoma and immunogenic MethA fibrosarcoma tumor models. We find that IL-13 reduces the tumorigenicity of B16F1 melanoma and MethA fibrosarcoma cells in vivo, most likely through the recruitment of neutrophils and macrophages. IL-13 mediated anti-tumor responses do not lead to the generation of tumor-specific T cells. Neither IL-13R{alpha}2Fc gene transduction nor in vivo treatment with soluble IL-13R{alpha}2Fc has a statistically significant effect of tumor growth. IL-13R{alpha}2 deficient host background does not alter tumor growth, suggesting that endogenous levels of IL-13 do not contribute to an anti-tumor response in these models. We conclude that IL-13, but not soluble IL-13R{alpha}2, has anti-tumor activity in the models described here, possibly by enhancing innate anti-tumor immunity.

Keywords: IL-13, IL-13 receptor alpha 2, neutrophils and macrophages, tumor models


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