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- Velasco-Hernandez, T., et al.
(author)
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Loss of HIF-1 alpha accelerates murine FLT-3(ITD)-induced myeloproliferative neoplasia
- 2015
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In: Leukemia. - : NATURE PUBLISHING GROUP. - 0887-6924 .- 1476-5551. ; 29:12, s. 2366-2374
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Journal article (peer-reviewed)abstract
- Hypoxia-induced signaling is important for normal and malignant hematopoiesis. The transcription factor hypoxia-inducible factor-1 alpha (HIF-1 alpha) has a crucial role in quiescence and self-renewal of hematopoietic stem cells (HSCs), as well as leukemia-initiating cells (LICs) of acute myeloid leukemia and chronic myeloid leukemia. We have investigated the effect of HIF-1 alpha loss on the phenotype and biology of FLT-3(ITD)-induced myeloproliferative neoplasm (MPN). Using transgenic mouse models, we show that deletion of HIF-1 alpha leads to an enhanced MPN phenotype reflected by an increased number of white blood cells, more severe splenomegaly and decreased survival. The proliferative effect of HIF-1 alpha loss is cell intrinsic as shown by transplantation into recipient mice. HSC loss and organ-specific changes in the number and percentage of long-term HSCs were the most pronounced effects on a cellular level after HIF-1 alpha deletion. Furthermore, we found a metabolic hyperactivation of malignant cells in the spleen upon loss of HIF-1 alpha. Some of our findings are in contrary to what has been previously described for the role of HIF-1 alpha in other myeloid hematologic malignancies and question the potential of HIF-1 alpha as a therapeutic target.
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