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- W1998968327 abstract "Prolyl oligopeptidase (POP) is a serine endopeptidase that hydrolyzes post-proline peptide bonds in peptides that are <30 amino acids in length. We recently reported that POP inhibition suppressed the growth of human neuroblastoma cells. The growth suppression was associated with pronounced G0/G1 cell cycle arrest and increased levels of the CDK inhibitor p27(kip1) and the tumor suppressor p53. In this study, we investigated the mechanism of POP inhibition-induced cell growth arrest using a human gastric cancer cell line, KATO III cells, which had a p53 gene deletion. POP specific inhibitors, 3-({4-[2-(E)-styrylphenoxy]butanoyl}-l-4-hydroxyprolyl)-thiazolidine (SUAM-14746) and benzyloxycarbonyl-thioprolyl-thioprolinal, or RNAi-mediated POP knockdown inhibited the growth of KATO III cells irrespective of their p53 status. SUAM-14746-induced growth inhibition was associated with G0/G1 cell cycle phase arrest and increased levels of p27(kip1) in the nuclei and the pRb2/p130 protein expression. Moreover, SUAM-14746-mediated cell cycle arrest of KATO III cells was associated with an increase in the quiescent G0 state, defined by low level staining for the proliferation marker, Ki-67. These results indicate that POP may be a positive regulator of cell cycle progression by regulating the exit from and/or reentry into the cell cycle by KATO III cells." @default.
- W1998968327 created "2016-06-24" @default.
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- W1998968327 date "2014-01-01" @default.
- W1998968327 modified "2023-10-16" @default.
- W1998968327 title "Prolyl oligopeptidase inhibition-induced growth arrest of human gastric cancer cells" @default.
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- W1998968327 doi "https://doi.org/10.1016/j.bbrc.2013.11.051" @default.
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