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• W3015403412 endingPage "110112" @default.
• W3015403412 startingPage "110112" @default.
• W3015403412 abstract "Negative crosstalk between PHLPP and PTEN in TGFβ-1 activated stem cells and cancer cells. A schematic illustration depicting factors involved in the down-regulation of PTEN in response to PHLPP overexpression. A Similar scenario involving miR190 is proposed for PHLPP down-regulation in response to PTEN overexpression. • Crosstalk between PHLPPs and PTEN in cancer cells, but not in normal cells. • The crosstalk promotes invasiveness in cancer cells and TGF-β1 activated stem cells. • The crosstalk is mediated by purinergic P2X4 receptor. Akt kinase regulates several cellular processes, among them growth, proliferation and survival, and has been correlated to neoplastic disease. We report here crosstalk between several Akt regulatory phosphatases that controls the level of the activated form (phosphorylated) of Akt and affects tumor cell aggressiveness. In prostate cancer cell lines, we observed that transient transfection of PTEN decreased the endogenous level of PHLPPs and in contrast, the transient transfection of PHLPPs decreased the endogenous level of PTEN. Furthermore, silencing of PTEN by siRNA resulted in increased PHLPP levels. This phenomenon was not seen in non-transformed cells or in prostate stem cells. This crosstalk promoted cancer cell invasion and was controlled by epigenetically regulated processes where activation of miRs (miR-190 and miR214), the polycomb group of proteins and DNA methylation were involved. The purinergic P2X4 receptor, which has been shown to have a role in wound healing, was identified to be the mediator of this crosstalk. We also studied prostate stem cells and found this crosstalk in the TGFβ1-activated epithelial-mesenchymal transition (EMT). The crosstalk seemed to be a natural part of EMT. In summary, we identify a crosstalk between Akt phosphatases which is not present in non-transformed prostate cells but occurs in cancer cells and stem cells transformed by TGFβ-1. This crosstalk is important for cellular invasion. Phosphatases regulate the Akt oncogene. Crosstalk between Akt phosphatases in prostate cancer cells and in TGF-β1 activated stem cells but not in non-transformed cells. This back-up mechanism facilitates invasive migration of prostate stem and cancer cells. Characterization of Akt regulation may lead to a better understanding of tumor development and to novel strategies for treatment." @default.
• W3015403412 created "2020-04-17" @default.
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• W3015403412 date "2020-07-01" @default.
• W3015403412 modified "2023-10-03" @default.
• W3015403412 title "PTEN and PHLPP crosstalk in cancer cells and in TGFβ-activated stem cells" @default.
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• W3015403412 doi "https://doi.org/10.1016/j.biopha.2020.110112" @default.
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