Publication date: 10 July 2017
Source:Cancer Letters, Volume 398
Author(s): Yasuyuki Gen, Kohichiroh Yasui, Tomoko Kitaichi, Naoto Iwai, Kei Terasaki, Osamu Dohi, Hikaru Hashimoto, Hayato Fukui, Yutaka Inada, Akifumi Fukui, Masayasu Jo, Michihisa Moriguchi, Taichiro Nishikawa, Atushi Umemura, Kanji Yamaguchi, Hiroyuki Konishi, Yuji Naito, Yoshito Itoh
ASPP2 regulates cell polarity and cell–cell adhesion by binding to, and co-localizing with PAR3 at tight junctions. Here we show a novel role of ASPP2 in suppressing gastric cancer (GC) invasiveness. Immunoprecipitation and immunofluorescence analyses showed that ASPP2 promoted the recruitment of PAR3 to cell–cell junctions in GC cells. Diminished expression of ASPP2 and loss of junctional PAR3 localization were significantly associated with diffuse-type histology, deeper invasion depth, positive peritoneal dissemination and worse prognosis in primary GC. ASPP2 suppressed migration and invasion of GC cells in vitro and peritoneal dissemination of GC cells in vivo in a mouse model. ASPP2 suppressed epithelial–mesenchymal transition (EMT) induced by TGF-β1-Smad2/3 signaling in GC cells through suppression of the degradation of Smad7, a negative regulator of TGF-β1-Smad2/3 signaling, by interacting with the E3 ubiquitin ligase ITCH. In conclusion, ASPP2 suppresses invasion, peritoneal dissemination and TGF-β1-induced EMT by inhibiting Smad7 degradation mediated by ITCH.
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