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Myeloma

A role for IFN-λ1 in multiple myeloma B cell growth

Abstract

Multiple myeloma (MM) is a progressive disease that results from dysregulated proliferation of plasma cells. Although, causative factors such as genetic events and altered expression of anti-apoptotic factors have been described in a number of patients, the mechanistic details that drive myeloma development and continued growth of malignant cells remain largely undefined. Numerous growth factors, including interleukin (IL)-6, Insulin-like growth factor-1 and IL-10 have been shown to promote growth of MM cells suggesting a significant role for cytokines in this disease. Interferon (IFN)-λ1 is a new member of the Class II cytokine family that, similar to IFN-α, has been shown to mediate viral immunity. In light of data supporting a role for cytokines in myeloma, we investigated the significance of IFN-λ1 on myeloma cell biology. Our studies show for the first time that myeloma cells bind to soluble IFN-λ1, and that IFN-λ1 induces myeloma cell growth and protects against dexamethasone-induced cell death. Our data also show that IFN-λ1 induces phosphorylation of STAT1, STAT3 and Erk. Taken together, our results suggest that IFN-λ1 may regulate myeloma cell biology and could prove to be therapeutically important.

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Acknowledgements

We would like to thank Diane Jelinek for the use of the KAS-6/1 and KP-6 cell line. This study supported in part by the National Institutes of Health Grants CA062242 and ZymoGenetics Inc. and Merck Serono International SA, an affiliate of Merck KGaA, Darmstadt, Germany.

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Correspondence to S M Ansell.

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Novak, A., Grote, D., Ziesmer, S. et al. A role for IFN-λ1 in multiple myeloma B cell growth. Leukemia 22, 2240–2246 (2008). https://doi.org/10.1038/leu.2008.263

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