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TNFα facilitates clonal expansion of JAK2V617F positive cells in myeloproliferative neoplasms
Open accessAbstract
Proinflammatory cytokines such as TNFα are elevated in patients with myeloproliferative neoplasms (MPN), but their contribution to disease pathogenesis is unknown. Here we reveal a central role for TNFα in promoting clonal dominance of JAK2V617F expressing cells in MPN. We show that JAK2V617F kinase regulates TNFα expression in cell lines and primary MPN cells and TNFα expression is correlated with JAK2V617F allele burden. In clonogenic assays, normal controls show reduced colony formation in the presence of TNFα while colony formation by JAK2V617F-positive progenitor cells is resistant or stimulated by exposure to TNFα. Ectopic JAK2V617F expression confers TNFα resistance to normal murine progenitor cells and overcomes inherent TNFα hypersensitivity of Fanconi anemia complementation group C deficient progenitors. Lastly, absence of TNFα limits clonal expansion and attenuates disease in a murine model of JAK2V617F-positive MPN. Altogether our data are consistent with a model where JAK2V617F promotes clonal selection by conferring TNFα resistance to a preneoplastic TNFα sensitive cell, while simultaneously generating a TNFα-rich environment. Mutations that confer resistance to environmental stem cell stressors are a recognized mechanism of clonal selection and leukemogenesis in bone marrow failure syndromes and our data suggest that this mechanism is also critical to clonal selection in MPN.
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Cites
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Metadata
- Authors
- Fleischman, A. G., Aichberger, K. J., Luty, S. B., Bumm, T. G., Petersen, C. L., Doratotaj, S., Vasudevan, K. B., LaTocha, D. H., Yang, F., Press, R. D., Loriaux, M. M., Pahl, H. L., Silver, R. T., Agarwal, A., O'Hare, T., Druker, B. J., Bagby, G. C., & Deininger, M. W.
- Venue
- Blood
- Publisher
- American Society of Hematology
- Published
- 2011-12-08
- Volume
- 118
- Issue
- 24
- Pages
- 6392-6398
- ISSN
- 0006-4971 (ISSN-L)
- 1528-0020
- OpenAlex
- W2040664937
- Cited by
- 292
- References
- 1
- FWCI
- 5.05
- Type
- journal article
- Language
- en
- Open access
- green
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