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Regulation of constitutive STAT5 phosphorylation in acute myeloid leukemia blasts

Leukemia volume 15, pages 1923–1931 (2001)Cite this article

Abstract

In the present study, we examined the underlying mechanism, which causes the constitutive tyrosine phosphorylation of signal transducer and activator of transcription 5 (STAT5) in acute myeloid leukemia (AML) blasts. Constitutive STAT5 phosphorylation was observed in 18 of 26 (69%) patients with AML. The constitutive STAT5 phosphorylation was caused by different mechanisms. In the majority of the investigated cases (71% (12 of 17)) constitutive STAT5 phosphorylation was associated with autophosphorylation of the type III receptor tyrosine kinase Flt3. In 47% (eight of 17) of these cases autophosphorylation of Flt3 coincided with tandem duplications of the Flt3 gene, resulting in constitutive phosphorylation of the receptor, while 24% (four of 17) of the cases demonstrated STAT5 phosphorylation and Flt3 autophosphorylation without mutations. In addition, a subset of AML cases (29% (five of 17)) had no autophosphorylation of the Flt3 receptor, but demonstrated constitutive STAT5 phosphorylation, which was partly due to autocrine growth factor production. All AML cases with high STAT5 and Flt3 phosphorylation demonstrated, in general, a lower percentage of spontaneous apoptosis, compared to AML blasts with no spontaneous STAT5 phosphorylation. Addition of the receptor tyrosine III kinase inhibitor AG1296 strongly inhibited STAT5 phosphorylation and enhanced the percentage of apoptotic cells without modulating the Bcl-xl protein levels. These data indicate that in the majority of AML cases the constitutive STAT5 phosphorylation is caused by Flt3 phosphorylation mostly due to mutations in the receptors and associated with a low degree of spontaneous apoptosis.

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Acknowledgements

This study was supported by grant RUG 99-1944 from the Dutch Cancer Foundation.

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Authors and Affiliations

  1. Division of Hematology, Department of Medicine, University of Groningen, Groningen, The Netherlands

    KU Birkenkamp, M Geugien, HH Lemmink & E Vellenga

  2. Division of Developmental Genetics, Department of Biology, University of Groningen, Groningen, The Netherlands

    W Kruijer

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Birkenkamp, K., Geugien, M., Lemmink, H. et al. Regulation of constitutive STAT5 phosphorylation in acute myeloid leukemia blasts. Leukemia 15, 1923–1931 (2001). https://doi.org/10.1038/sj.leu.2402317

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