Journal
BRITISH JOURNAL OF HAEMATOLOGY
Volume 168, Issue 3, Pages 338-349Publisher
WILEY
DOI: 10.1111/bjh.13129
Keywords
primary myelofibrosis; polycythaemia vera; essential thrombocythaemia; HMGA2; micro RNA
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Funding
- Ministry of Education, Science, Technology, Sports and Culture of Japan [24591405]
- Japan Leukaemia Research Fund
- SENSHIN Medical Research Foundation
- NOVARATIS Foundation (Japan) for the Promotion of Science [11-120]
- Fukushima Medical University Research Project [KKI23034]
- Grants-in-Aid for Scientific Research [25461431, 24591405] Funding Source: KAKEN
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Overexpression of high mobility group AT-hook 2 (Hmga2), which is negatively regulated by MIRLET7 micro RNAs through 3-untranslated region (3UTR), causes proliferative haematopoiesis mimicking myeloproliferative neoplasms (MPNs) and contributes to progression of myelofibrosis in mice. Thus, we investigated HMGA2 mRNA expression in 66 patients with MPNs including 23 polycythaemia vera (PV), 33 essential thrombocythaemia (ET) and 10 primary myelofibrosis (PMF). HMGA2 mRNA expression, especially variant 1 with 3UTR that contains MIRLET7-specific sites, rather than variant 2 lacking 3UTR, is frequently deregulated due to decreased MIRLET7 expression in granulocytes from over 20% of PV and ET, and in either granulocytes or CD34(+) cells from 100% of PMF. Patients with deregulated HMGA2 mRNA expression were significantly more likely to show splenomegaly, high serum lactate dehydrogenase values, and methylation of the CDKN2A promoter compared with other patients without deregulation of HMGA2. A histone deacetylase inhibitor, panobinostat, significantly increased MIRLET7 expression and reduced variant 1 of HMGA2 mRNA expression, but not variant 2, in both U937 cells and PMF-derived CD34(+) cells. Moreover, both panobinostat and small interfering RNA of HMGA2 demethylated the CDKN2A promoter in U937 cells. In conclusion, the frequently dysregulated MIRLET7/HMGA2 axis could be a therapeutic target in MPNs.
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