PMID- 33711213 OWN - NLM STAT- MEDLINE DCOM- 20211112 LR - 20211112 IS - 1437-4315 (Electronic) IS - 1431-6730 (Linking) VI - 402 IP - 6 DP - 2021 May 26 TI - STAT3 promotes peritoneal metastasis of gastric cancer by enhancing mesothelial-mesenchymal transition. PG - 739-748 LID - 10.1515/hsz-2021-0120 [doi] AB - Signal transducer and activator of transcription 3 (STAT3) is a widely-reported oncogene in many human cancers, but its role in the peritoneal metastasis of gastric cancer (GC) has yet to be studied. The expression level of STAT3 in GC patient tissues was assessed. Stable shRNA knockdown (KD) of STAT3 was established in GC cell line AGS, followed by examination of its effect on AGC cell viability and proliferation, xenograft tumor growth, metastatic potential, mesothelial-to-mesenchymal transition (MMT)-related properties and peritoneal metastasis in a mouse model. The specific STAT3 inhibitor BP1-102 was also employed to verify findings from STAT3 KD experiments. Expression of activated STAT3 was upregulated in GC patient tumor tissues, and further elevated among patients diagnosed with peritoneal metastasis. STAT3 deactivation suppressed viability and proliferation of GC cells in vitro, as well as GC tumorigenesis in vivo. Furthermore, the metastatic properties and production of MMT-inducing factors of GC cells in vitro were also dependent on STAT3 activation. Importantly, STAT3 KD significantly compromised peritoneal metastasis of GC in vivo. STAT3 activation contributes to peritoneal metastasis of GC by promoting MMT, warranting further investigation to explore its potential for GC treatment, in particular among peritoneal metastasis patients. CI - (c) 2021 Walter de Gruyter GmbH, Berlin/Boston. FAU - Yang, Hongkui AU - Yang H AD - Department of Oncology, Quanzhou First Hospital Affiliated to Fujian Medical University, No. 248-252 Dong Road, Quanzhou362000, Fujian, China. FAU - Xu, Wenjun AU - Xu W AUID- ORCID: 0000-0003-3928-2706 AD - Department of Oncology, Quanzhou First Hospital Affiliated to Fujian Medical University, No. 248-252 Dong Road, Quanzhou362000, Fujian, China. LA - eng PT - Journal Article DEP - 20210315 PL - Germany TA - Biol Chem JT - Biological chemistry JID - 9700112 RN - 0 (STAT3 Transcription Factor) RN - 0 (STAT3 protein, human) SB - IM MH - Animals MH - Cell Adhesion MH - Epithelial-Mesenchymal Transition MH - Humans MH - Mice MH - Mice, Nude MH - Neoplasms, Experimental/diagnosis/metabolism MH - STAT3 Transcription Factor/genetics/*metabolism MH - Stomach Neoplasms/diagnosis/*metabolism MH - Tumor Cells, Cultured OTO - NOTNLM OT - gastric cancer OT - mesothelial-to-mesenchymal transition OT - peritoneal metastasis OT - signal transducer and activator of transcription 3 (STAT3) OT - tumor EDAT- 2021/03/13 06:00 MHDA- 2021/11/16 06:00 CRDT- 2021/03/12 17:23 PHST- 2020/12/21 00:00 [received] PHST- 2021/02/23 00:00 [accepted] PHST- 2021/03/13 06:00 [pubmed] PHST- 2021/11/16 06:00 [medline] PHST- 2021/03/12 17:23 [entrez] AID - hsz-2021-0120 [pii] AID - 10.1515/hsz-2021-0120 [doi] PST - epublish SO - Biol Chem. 2021 Mar 15;402(6):739-748. doi: 10.1515/hsz-2021-0120. Print 2021 May 26.