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Thymic lymphomas in interleukin 9 transgenic mice

J C Renauld¹, N van der Lugt, A Vink

¹Ludwig Institute for Cancer Research, Catholic University of Louvain, Brussels, Belgium.

|May 1, 1994

Summary

Overexpressing interleukin 9 (IL-9) in mice led to thymic lymphomas. IL-9 is crucial for tumor growth, suggesting its dysregulation contributes to T cell malignancies.

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Area of Science:

Immunology
Oncology
Molecular Biology

Background:

Interleukin 9 (IL-9) is a cytokine with pleiotropic effects on immune cells.
The role of IL-9 in T cell malignancies is not fully understood.

Purpose of the Study:

To investigate the in vivo biological activity of interleukin 9 (IL-9).
To determine the potential role of IL-9 in the development of T cell lymphomas.

Main Methods:

Generation of transgenic mice overexpressing the IL-9 gene.
Histological and morphological analysis of lymphoid systems.
Tumor cell characterization (clonality, T cell receptor rearrangements, CD4/CD8 expression).
Assessment of susceptibility to chemical carcinogens (N-methyl-N-nitrosourea).

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In vivo tumor transplantation assays.

In vitro proliferation assays of tumor cell lines.

Main Results:

Transgenic mice developed thymic lymphomas (7% incidence) with clonal, CD4+/CD8+ T cell characteristics.
Transgenic mice showed increased susceptibility to chemical carcinogen-induced thymic tumors.
IL-9 expression was essential for optimal tumor growth in vivo.
An autocrine IL-9 loop was implicated in the proliferation of transgene-negative tumor cells.

Conclusions:

Dysregulated IL-9 expression can contribute to the pathogenesis of T cell malignancies.
IL-9 plays a critical role in promoting the growth and survival of T cell lymphomas.
These findings highlight IL-9 as a potential therapeutic target in T cell cancers.