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- W2184394483 abstract "// Oihana Iriondo 1 , Miriam Rábano 1 , Giacomo Domenici 1 , Onintza Carlevaris 1 , José Antonio López-Ruiz 2 , Ignacio Zabalza 3 , Edurne Berra 1 and Maria dM Vivanco 1 1 Cell Biology and Stem Cells Unit, CIC bioGUNE, Derio, Spain 2 Servicio de Radiodiagnóstico Preteimagen, Bilbao, Spain 3 Department of Pathology, Galdakao-Usansolo Hospital, Galdakao, Spain Correspondence to: Maria dM Vivanco, email: // Keywords : breast cancer, estrogen receptor, hypoxia, PHD3, stem cells Received : March 16, 2015 Accepted : August 10, 2015 Published : September 10, 2015 Abstract The heterogeneous nature of breast cancer is a result of intrinsic tumor complexity and also of the tumor microenvironment, which is known to be hypoxic. We found that hypoxia expands different breast stem/progenitor cell populations (cells with increased aldehyde dehydrogenase activity (Aldefluor + ), high mammosphere formation capacity and CD44 + CD24 -/low cells) both in primary normal epithelial and tumor cells. The presence of the estrogen receptor (ER) limits hypoxia-dependent CD44 + CD24 -/low cell expansion.We further show that the hypoxia-driven cancer stem-like cell enrichment results from a dedifferentiation process. The enhanced mammosphere formation and Aldefluor + cell content observed in breast cancer cells relies on hypoxia-inducible factor 1α (HIF1α). In contrast, the CD44 + CD24 -/low population expansion is HIF1α independent and requires prolyl hydroxylase 3 (PHD3) downregulation, which mimics hypoxic conditions, leading to reduced CD24 expression through activation of NFkB signaling. These studies show that hypoxic conditions expand CSC populations through distinct molecular mechanisms. Thus, potential therapies that combine current treatments for breast cancer with drugs that target CSC should take into account the heterogeneity of the CSC subpopulations." @default.
- W2184394483 created "2016-06-24" @default.
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- W2184394483 date "2015-09-10" @default.
- W2184394483 modified "2023-09-24" @default.
- W2184394483 title "Distinct breast cancer stem/progenitor cell populations require either HIF1α or loss of PHD3 to expand under hypoxic conditions" @default.
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- W2184394483 doi "https://doi.org/10.18632/oncotarget.5564" @default.
- W2184394483 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4741635" @default.