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- W1976361405 abstract "InsP6 [Ins(1,2,3,4,5,6)P6; phytate] is the most abundant inositol phosphate in mammalian cells with cytosolic/nuclear concentrations of up to 50 μM. We noticed that InsP6 in culture medium at a concentration of ≤50 μM significantly stimulates H1299 tumour cell growth, whereas larger concentrations of InsP6 inhibit growth. A detailed study of the fate of 30 μM InsP6 added to H199 cells revealed a major fraction of InsP6 initially precipitates as cell-surface metal complexes, but becomes slowly re-solubilized by extracellular dephosphorylation first to InsP3 isomers and subsequently to free myo-inositol. The precipitated metal–InsP6 complex is endocytosed in a receptor-independent but intact-glycocalyx-dependent manner and appears in lysosomes, where it is immediately dephosphorylated to Ins(1,2,4,5,6)P5 and very slowly to free inositol. By RNA knockdown, we identified secreted and lysosome targeted MINPP1 (multiple inositol-polyphosphate phosphatase 1), the mammalian 3-phytase, to be essentially involved both in extracellular and in lysosomal InsP6 dephosphorylation. The results of the present study indicate that tumour cells employ this enzyme to utilize the micronutrients myo-inositol and metal-phosphate when encountering extracellular InsP6 and thus to enhance their growth potential." @default.
- W1976361405 created "2016-06-24" @default.
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- W1976361405 date "2013-01-24" @default.
- W1976361405 modified "2023-09-23" @default.
- W1976361405 title "Tumour cells can employ extracellular Ins(1,2,3,4,5,6)<i>P</i>6 and multiple inositol-polyphosphate phosphatase 1 (MINPP1) dephosphorylation to improve their proliferation" @default.
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- W1976361405 doi "https://doi.org/10.1042/bj20121524" @default.
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