Abstract
An acquired JAK2 V617F mutation is found in most patients with polycythemia vera (PV), and about half of patients with essential thrombocythemia (ET) or primary myelofibrosis (PMF). Mice transplanted with bone marrow cells in which JAK2 V617F was retrovirally expressed developed PV-like features, but not ET or PMF. To address the contribution of this mutation to the pathogenesis of these three MPDs, we generated two lines of JAK2 V617F transgenic mice. One line showed granulocytosis after 4 months of age. Among 43 mice, 8 (19%) showed polycythemia and 15 (35%) showed thrombocythemia. The second line showed extreme leukocytosis and thromobocytosis. They showed anemia that means Hb value from 9 to 10 g per 100 ml when 1 month old. Myeloid cells and megakaryocytes were predominant in the bone marrow of these animals, and splenomegaly was observed. The expression of JAK2 V617F mRNA in bone marrow cells was 0.45 and 1.35 that of endogenous wild-type JAK2 in the two lines, respectively. In vitro analysis of bone marrow cells from both lines showed constitutive activation of ERK1/2, STAT5 and AKT, and augmentation of their phosphorylations by cytokine stimulation. We conclude that in vivo expression of JAK2 V617F results in ET-, PMF- and PV-like disease.
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Acknowledgements
We thank Dr N Watanabe (Department of Hematopoietic Factors, Institute of Medical Science, the University of Tokyo) for helpful advice and discussion concerning bubble LM-PCR. We also thank M Matsushita, K Tsugura and K Toyama for their excellent technical assistance.
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Shide, K., Shimoda, H., Kumano, T. et al. Development of ET, primary myelofibrosis and PV in mice expressing JAK2 V617F. Leukemia 22, 87–95 (2008). https://doi.org/10.1038/sj.leu.2405043
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DOI: https://doi.org/10.1038/sj.leu.2405043
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