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• W2169668460 abstract "In multicellular organisms, a tight control of cell death is required to ensure normal development and tissue homeostasis. Improper function of apoptotic or survival pathways can not only affect developmental programs but also favor cancer progression. Here we describe a novel apoptotic signaling pathway involving the transmembrane receptor Kremen1 and its ligand, the Wnt-antagonist Dickkopf1. Using a whole embryo culture system, we first show that Dickkopf1 treatment promotes cell survival in a mouse model exhibiting increased apoptosis in the developing neural plate. Remarkably, this effect was not recapitulated by chemical Wnt inhibition. We then show that Dickkopf1 receptor Kremen1 is a bona fide dependence receptor, triggering cell death unless bound to its ligand. We performed Wnt-activity assays to demonstrate that the pro-apoptotic and anti-Wnt functions mediated by Kremen1 are strictly independent. Furthermore, we combined phylogenetic and mutagenesis approaches to identify a specific motif in the cytoplasmic tail of Kremen1, which is (i) specifically conserved in the lineage of placental mammals and (ii) strictly required for apoptosis induction. Finally, we show that somatic mutations of kremen1 found in human cancers can affect its pro-apoptotic activity, supporting a tumor suppressor function. Our findings thus reveal a new Wnt-independent function for Kremen1 and Dickkopf1 in the regulation of cell survival with potential implications in cancer therapies." @default.
• W2169668460 created "2016-06-24" @default.
• W2169668460 creator A5043726842 @default.
• W2169668460 creator A5058029971 @default.
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• W2169668460 date "2015-07-24" @default.
• W2169668460 modified "2023-10-09" @default.
• W2169668460 title "Kremen1 and Dickkopf1 control cell survival in a Wnt-independent manner" @default.
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• W2169668460 doi "https://doi.org/10.1038/cdd.2015.100" @default.
• W2169668460 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4716294" @default.
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• W2169668460 hasPublicationYear "2015" @default.
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