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Ooms, Lisa M.; Binge, Lauren C.; Davies, Elizabeth M.; Rahman, Parvin; Conway, James R.W.; Gurung, Rajendra; Ferguson, Daniel T.; Papa, Antonella; Fedele, Clare G.; Vieusseux, Jessica L.; Chai, Ryan C.; Koentgen, Frank; Price, John T.; Tiganis, Tony; Timpson, Paul; McLean, Catriona A.; Mitchell, Christina A.
Cancer cell, 08/2015, Letnik: 28, Številka: 2Journal Article
Metastasis is the major cause of breast cancer mortality. Phosphoinositide 3-kinase (PI3K) generated PtdIns(3,4,5)P3 activates AKT, which promotes breast cancer cell proliferation and regulates migration. To date, none of the inositol polyphosphate 5-phosphatases that inhibit PI3K/AKT signaling have been reported as tumor suppressors in breast cancer. Here, we show depletion of the inositol polyphosphate 5-phosphatase PIPP (INPP5J) increases breast cancer cell transformation, but reduces cell migration and invasion. Pipp ablation accelerates oncogene-driven breast cancer tumor growth in vivo, but paradoxically reduces metastasis by regulating AKT1-dependent tumor cell migration. PIPP mRNA expression is reduced in human ER-negative breast cancers associated with reduced long-term outcome. Collectively, our findings identify PIPP as a suppressor of oncogenic PI3K/AKT signaling in breast cancer. Display omitted •Pipp knockout promotes oncogene-driven breast cancer initiation and growth•Ablation of Pipp impairs metastasis in a mouse model of breast cancer•PIPP regulates AKT1-dependent cell migration and invasion•Low PIPP expression is associated with ER-negative breast cancer and poor prognosis Ooms et al. identify the inositol polyphosphate 5-phosphatase PIPP as a suppressor of oncogenic PI3K/AKT signaling in breast cancer. PIPP depletion increases transformation and accelerates oncogene-driven tumor growth in vivo, while paradoxically reducing cell migration, invasion, and metastasis.
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in: SICRIS
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