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To investigate the effect of RSPO3 on the tumor growth of choriocarcinoma JEG-3 cells, the expression of RSPO3 in human term placenta was detected, and a stable RSPO3-overexpressing JEG-3 cell line was established via lentivirus-mediated transduction. The expression of biomarkers involved in tumorigenicity was detected in the RSPO3-overexpressing JEG-3 cells, and cell proliferation, invasion, migration, and apoptosis were investigated. Moreover, soft agar clonogenic assays and xenograft tumorigenicity assays were performed to assess the effect of RSPO3 on tumor growth in vitro and in vivo. The results showed that RSPO3 was widely expressed in human term placenta and overexpression of RSPO3 promoted the proliferation and inhibited the migration, invasion, and apoptosis of the JEG-3 cells. Meanwhile, RSPO3 overexpression promoted tumor growth both in vivo and in vitro. Further investigation showed that the phosphorylation levels of Akt, phosphatidylinositol 3-kinase (PI3K), and ERK as well the expression of \u03b2-catenin and proliferating cell nuclear antigen (PCNA) were increased in the RSPO3-overexpressing JEG-3 cells and tumor xenograft. Taken together, these data indicate that RSPO3 promotes the tumor growth of choriocarcinoma via Akt\/PI3K\/ERK signaling, which supports RSPO3 as an oncogenic driver promoting the progression of choriocarcinoma.<\/jats:p>","DOI":"10.1152\/ajpcell.00295.2019","type":"journal-article","created":{"date-parts":[[2019,12,18]],"date-time":"2019-12-18T14:28:31Z","timestamp":1576679311000},"page":"C664-C674","source":"Crossref","is-referenced-by-count":9,"title":["R-spondin3 promotes the tumor growth of choriocarcinoma JEG-3 cells"],"prefix":"10.1152","volume":"318","author":[{"given":"Zhilong","family":"Chen","sequence":"first","affiliation":[{"name":"College of Veterinary Medicine, Hunan Agricultural University, Changsha, China"},{"name":"Research Center for Reproduction and Health Development, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 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