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• W2495672790 abstract "Abstract High glucose-regulated protein 78 (GRP78) expression contributes to the acquisition of a wide range of phenotypic cancer hallmarks and the pleiotropic oncogenic functions of GRP78 may result from its diverse subcellular distribution. Interestingly, GRP78 has been reported to be secreted from solid tumour cells, participating in cell-cell communication in the tumour microenvironment. However, the mechanism underlying this secretion remains elusive. Here, we report that GRP78 is secreted from colon cancer cells via exosomes. Histone deacetylase (HDAC) inhibitors blocked GRP78 release by inducing its aggregation in the ER. Mechanistically, HDAC inhibitor treatment suppressed HDAC6 activity and led to increased GRP78 acetylation; acetylated GRP78 then bound to VPS34, a class III phosphoinositide-3 kinase, consequently preventing the sorting of GRP78 into multivesicular bodies (MVBs). Of note, we found that mimicking GRP78 acetylation by substituting the lysine at residue 633, one of the deacetylated sites of HDAC6, with a glutamine resulted in decreased GRP78 secretion and impaired tumour cell growth in vitro . Our study thus reveals a hitherto-unknown mechanism of GRP78 secretion and may also provide implications for the therapeutic use of HDAC inhibitors." @default.
• W2495672790 created "2016-08-23" @default.
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• W2495672790 date "2016-07-27" @default.
• W2495672790 modified "2023-10-02" @default.
• W2495672790 title "Acetylation modification regulates GRP78 secretion in colon cancer cells" @default.
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• W2495672790 doi "https://doi.org/10.1038/srep30406" @default.
• W2495672790 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4961953" @default.
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