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Hypoxia inducible factor (HIF)-2α accelerates disease progression in mouse models of leukemia and lymphoma but is not a poor prognosis factor in human AML.

Abstract
Hypoxia-inducible factor (HIF)-1α accumulation promotes hematopoietic stem cells' quiescence and is necessary to maintain their self-renewal. However, the role of HIF-2α in hematopoietic cells is less clear. We investigated the role of HIF-2α in leukemia and lymphoma cells. HIF-2α expression was high in subsets of human and mouse leukemia and lymphoma cells, whereas it was low in normal bone marrow leukocytes. To investigate the role of HIF-2α, we transduced human HIF-2α cDNA in mouse syngeneic models of myeloid preleukemia and a transgenic model of B lymphoma. Ectopic expression of HIF-2α accelerated leukemia cell proliferation in vitro. Mice transplanted with cells transduced with HIF-2α died significantly faster of leukemia or B lymphoma than control mice transplanted with empty vector-transduced cells. Conversely, HIF-2α knockdown in human myeloid leukemia HL60 cells decreased proliferation in vitro and significantly prolonged animal survival following transplantation. In human acute myeloid leukemia (AML), HIF-2α mRNA was significantly elevated in several subsets such as the t(15;17), inv(16), complex karyotype and favorable cytogenetic groups. However, patients with high HIF-2α expression had a trend to higher disease-free survival in univariate analysis. The different effects of HIF-2α overexpression in mouse models of leukemia and human AML illustrates the complexity of this mutliclonal disease.
AuthorsC E Forristal, A L Brown, F M Helwani, I G Winkler, B Nowlan, V Barbier, R J Powell, G A Engler, S M Diakiw, A C W Zannettino, S Martin, D Pattabiraman, R J D'Andrea, I D Lewis, J P Levesque
JournalLeukemia (Leukemia) Vol. 29 Issue 10 Pg. 2075-85 (Oct 2015) ISSN: 1476-5551 [Electronic] England
PMID25921247 (Publication Type: Journal Article)

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