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STAT5BN642H is a driver mutation for T cell neoplasia
Ha Thi Thanh Pham, … , Veronika Sexl, Richard Moriggl
Ha Thi Thanh Pham, … , Veronika Sexl, Richard Moriggl
Published December 4, 2017
Citation Information: J Clin Invest. 2018;128(1):387-401. https://doi.org/10.1172/JCI94509.
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Research Article Hematology Oncology

STAT5BN642H is a driver mutation for T cell neoplasia

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Abstract

STAT5B is often mutated in hematopoietic malignancies. The most frequent STAT5B mutation, Asp642His (N642H), has been found in over 90 leukemia and lymphoma patients. Here, we used the Vav1 promoter to generate transgenic mouse models that expressed either human STAT5B or STAT5BN642H in the hematopoietic compartment. While STAT5B-expressing mice lacked a hematopoietic phenotype, the STAT5BN642H-expressing mice rapidly developed T cell neoplasms. Neoplasia manifested as transplantable CD8+ lymphoma or leukemia, indicating that the STAT5BN642H mutation drives cancer development. Persistent and enhanced levels of STAT5BN642H tyrosine phosphorylation in transformed CD8+ T cells led to profound changes in gene expression that were accompanied by alterations in DNA methylation at potential histone methyltransferase EZH2-binding sites. Aurora kinase genes were enriched in STAT5BN642H-expressing CD8+ T cells, which were exquisitely sensitive to JAK and Aurora kinase inhibitors. Together, our data suggest that JAK and Aurora kinase inhibitors should be further explored as potential therapeutics for lymphoma and leukemia patients with the STAT5BN642H mutation who respond poorly to conventional chemotherapy.

Authors

Ha Thi Thanh Pham, Barbara Maurer, Michaela Prchal-Murphy, Reinhard Grausenburger, Eva Grundschober, Tahereh Javaheri, Harini Nivarthi, Auke Boersma, Thomas Kolbe, Mohamed Elabd, Florian Halbritter, Jan Pencik, Zahra Kazemi, Florian Grebien, Markus Hengstschläger, Lukas Kenner, Stefan Kubicek, Matthias Farlik, Christoph Bock, Peter Valent, Mathias Müller, Thomas Rülicke, Veronika Sexl, Richard Moriggl

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Figure 1

hSTAT5BN642H is an activating mutation.

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hSTAT5BN642H is an activating mutation.
(A) Schematic of STAT5B mutation...
(A) Schematic of STAT5B mutations identified in leukemia and lymphoma patients. Each dot represents 1 patient. (B) WB analysis of pY-STAT5, total STAT5 protein, and HSC70 in 293T cells that were transiently transfected with different hSTAT5B (hS5B) variants using a pMSCV-IRES-GFP vector, with or without growth hormone (GH) stimulation. (C) WB analysis of pY-STAT5, STAT5, FLAG, and HSC70 in hSTAT5B- or hSTAT5BN642H-expressing (N642H) Ba/F3 cells with or without IL-3 stimulation. (B and C) Nontransfected and pMSCV-transfected cells are shown as controls. Data presented in B and C are representative of 3 independent experiments. Samples were run on parallel gels for B and C, and a loading control is provided for each gel.

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ISSN: 0021-9738 (print), 1558-8238 (online)

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