Abstract
Chronic myeloid leukemia (CML) is characterized by the clonal expansion of hematopoietic stem cells (HSCs). Without effective treatment, individuals in the indolent, chronic phase (CP) of CML undergo blast crisis (BC), the prognosis for which is poor. It is therefore important to clarify the mechanism underlying stage progression in CML. DNA microarray is a versatile tool for such a purpose. However, simple comparison of bone marrow mononuclear cells from individuals at different disease stages is likely to result in the identification of pseudo-positive genes whose change in expression only reflects the different proportions of leukemic blasts in bone marrow. We have therefore compared with DNA microarray the expression profiles of 3456 genes in the purified HSC-like fractions that had been isolated from 13 CML patients and healthy volunteers. Interestingly, expression of the gene for PIASy, a potential inhibitor of STAT (signal transducer and activator of transcription) proteins, was down-regulated in association with stage progression in CML. Furthermore, forced expression of PIASy has induced apoptosis in a CML cell line. These data suggest that microarray analysis with background-matched samples is an efficient approach to identify molecular events underlying the stage progression in CML.
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Acknowledgements
We are grateful to A Iida and J-K Yee for the kind gifts of tTAER cDNA and the tetO fragment, and T. Kitamura for the pMX vector. This work was supported in part by a Grant-in-Aid for Research on the Second-Term Comprehensive 10-Year Strategy for Cancer Societies from the Ministry of Health and Welfare of Japan, by a Grant-in-Aid for Scientific Research on Priority Areas from the Ministry of Education, Science, Sports, and Culture of Japan, and by the Science Research Promotion Fund of the Promotion and Mutual Aid Corporation for Private Schools of Japan. J Ota is a research resident of the Japan Health Sciences Foundation.
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Ohmine, K., Ota, J., Ueda, M. et al. Characterization of stage progression in chronic myeloid leukemia by DNA microarray with purified hematopoietic stem cells. Oncogene 20, 8249–8257 (2001). https://doi.org/10.1038/sj.onc.1205029
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DOI: https://doi.org/10.1038/sj.onc.1205029
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