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Original Article |
Correspondence to: Michael A. Caligiuri, The Ohio State University, 458A Starling-Loving Hall, 320 West 10th Ave., Columbus, OH 43210. Tel:614-293-7521 Fax:614-293-7522 E-mail:caligiuri-1{at}medctr.osu.edu.
Inflammation likely has a role in the early genesis of certain malignancies. Interleukin (IL)-15, a proinflammatory cytokine and growth factor, is required for lymphocyte homeostasis. Intriguingly, the expression of IL-15 protein is tightly controlled by multiple posttranscriptional mechanisms. Here, we engineered a transgenic mouse to overexpress IL-15 by eliminating these posttranscriptional checkpoints. IL-15 transgenic mice have early expansions in natural killer (NK) and CD8+ T lymphocytes. Later, these mice develop fatal lymphocytic leukemia with a T-NK phenotype. These data provide novel evidence that leukemia, like certain other cancers, can arise as the result of chronic stimulation by a proinflammatory cytokine.
Key Words: interleukin 15, leukemia, transgenic mice, lymphocytes, inflammation
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