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pubmed-article:20822910pubmed:dateCreated2010-11-1lld:pubmed
pubmed-article:20822910pubmed:abstractTextThe ability of glioma cells to escape the immune system remains a significant barrier to successful immunotherapy. Here we demonstrate that loss of the PTEN tumor suppressor gene, with associated activation of the PI3K/Akt/mTOR pathway, leads to a human glioma phenotype that induces autologous T-cell apoptosis upon contact. The PTEN status of pathologically confirmed glioblastoma specimens was defined, and primary cultures established after surgical resection of tumor from 26 patients. Autologous T-cells were isolated from these patients, and after T-cell activation was induced, these cells were co-cultured with matched autologous glioma cells, either alone, or after treatment with one of three inhibitors of the PI3K/Akt/mTOR pathway. When co-cultured with autologous T-cells, PTEN wild-type tumor cells induced apoptosis in a minimal number of activated T-cells (6-12% of T-cells), whereas tumors with PTEN loss induced much more profound levels of T-cell apoptosis (42-56% of T-cells). Prior treatment of PTEN-deficient tumor cells with specific inhibitors of the PI3K/Akt/mTOR pathway diminished T-cell apoptosis to levels seen after co-culture with wild-type PTEN tumor cells, suggesting that PTEN loss confers this immunoresistant phenotype through the PI3K/Akt/mTOR pathway. These results suggest that PTEN-deficient glioblastoma patients are suboptimal candidates for immunotherapy. In addition, our results raise the possibility of combining T-cell based immunotherapy protocols with clinical inhibitors of the PI3K/Akt/mTOR pathway.lld:pubmed
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pubmed-article:20822910pubmed:authorpubmed-author:MillsSteven...lld:pubmed
pubmed-article:20822910pubmed:copyrightInfoCopyright © 2010 Elsevier Ltd. All rights reserved.lld:pubmed
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pubmed-article:20822910pubmed:volume17lld:pubmed
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pubmed-article:20822910pubmed:articleTitleImplications for immunotherapy of tumor-mediated T-cell apoptosis associated with loss of the tumor suppressor PTEN in glioblastoma.lld:pubmed
pubmed-article:20822910pubmed:affiliationDepartment of Neurological Surgery, University of California at San Francisco, San Francisco, California 94123, USA.lld:pubmed
pubmed-article:20822910pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20822910pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:20822910pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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