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Activation of Wnt signalling in acute myeloid leukemia by induction of Frizzled-4

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Wnt signalling regulates proliferation, self renewal and cell fate. Aberrant Wnt signalling is thought to contribute to AML pathogenesis by enhancing self renewal. Herein, we provide evidence for increased expression of Frizzled-4, a receptor for Wnt ligands, in primary AML blasts compared to normal bone marrow on the protein level. In addition, Frizzled-4 is highly expressed in human CD34 positive cells as well as in lineage negative sorted mouse bone marrow cells. Functionally, Frizzled-4 expression modulates apoptosis and enhances Wnt3a induced β-catenin stability in myeloid progenitor cells. Frizzled-4-dependent β-catenin stabilization is dkk-1 sensitive, implicating a specific Wnt-ligand/Frizzled-receptor interaction. These findings indicate enhanced sensitivity of AML blasts for Wnt-ligands and suggest an additional mechanism of Wnt signalling activation in the pathogenesis of AML.
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Document Type: Research Article

Affiliations: Department of Medicine, Hematology and Oncology, University of Muenster, 48149 Muenster, Germany., Email: [email protected]

Publication date: January 1, 2008

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  • The International Journal of Oncology provides an international forum for the publication of the latest, cutting-edge research in the broad area of oncology and cancer treatment. The journal accepts original high quality works and reviews on all aspects of oncology research including carcinogenesis, metastasis, epidemiology, chemotherapy and viral oncology. Through fair and efficient peer review, the journal is dedicated to publishing top tier research in the field, offering authors rapid publication as well as high standards of copy-editing and production. The International Journal of Oncology is published on a monthly basis in both print and early online.
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