Peng Xu1,2, XiaoLan Xu3, Xiao Wu4, LiXiang Zhang5, Lei Meng5, ZhangMing Chen5, WenXiu Han5, Jie Yao6, AMan Xu7,8. 1. Department of General Surgery, The Fourth Affiliated Hospital of Anhui Medical University, No. 100 Huaihai Avenue, Xinzhan District, Hefei City, 230000, Anhui Province, China. 2. Department of Hepatobiliary and Pancreatic Surgery, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, No. 98, Nantong West Road, Yangzhou City, 225001, Jiangsu Province, China. 3. Department of Critical Care Medicine, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, 225001, China. 4. Department of Pathophysiology, Basic Medical College of Anhui Medical University, Anhui Provincial Key Laboratory of Pathophysiology, Hefei, 230022, China. 5. Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China. 6. Department of Hepatobiliary and Pancreatic Surgery, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, No. 98, Nantong West Road, Yangzhou City, 225001, Jiangsu Province, China. JieYao1975@126.com. 7. Department of General Surgery, The Fourth Affiliated Hospital of Anhui Medical University, No. 100 Huaihai Avenue, Xinzhan District, Hefei City, 230000, Anhui Province, China. xuama1965@126.com. 8. Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China. xuama1965@126.com.
Abstract
BACKGROUND: Gastric cancer (GC) is common in East Asia, yet its molecular and pathogenic mechanisms remain unclear. Circular RNAs (circRNAs) are differentially expressed in GC and may be promising biomarkers. Here, we investigated the role and regulatory mechanism of circTMC5 in GC. METHODS: CircTMC5 expression was detected in human GC and adjacent tissues using microarray assays and qRT-PCR, while the clinicopathological characteristics of patients with GC were used to assess its diagnostic and prognostic value. The circTMC5/miR-361-3p/RABL6 axis was examined in vitro and vivo, and the immune roles of RABL6 were evaluated using bioinformatics analyses and immunohistochemistry (IHC). RESULTS: CircTMC5 was highly expressed in GC tissues, plasma, and cell lines, and was closely related to histological grade, pathological stage, and T classification in patients with GC. CircTMC5 expression was also an independent prognostic factor for GC and its combined detection with carcinoembryonic antigen may improve GC diagnosis. Low circTMC5 expression correlated with good prognosis, inhibited GC cell proliferation, and promoted apoptosis. Mechanistically, circTMC5 overexpression promoted GC cell proliferation, invasion, and metastasis but inhibited apoptosis by sponging miR-361-3p and up-regulating RABL6 in vitro and vivo, whereas miR-361-3p up-regulation had the opposite effects. RABL6 was highly expressed in GC and was involved in immune regulation and infiltration in GC. CONCLUSIONS: CircTMC5 promotes GC and sponges miR-361-3p to up-regulate RABL6 expression, thus may have diagnostic and prognostic value in GC. RABL6 also displays therapeutic promise due to its role in the immune regulation of GC.
BACKGROUND: Gastric cancer (GC) is common in East Asia, yet its molecular and pathogenic mechanisms remain unclear. Circular RNAs (circRNAs) are differentially expressed in GC and may be promising biomarkers. Here, we investigated the role and regulatory mechanism of circTMC5 in GC. METHODS: CircTMC5 expression was detected in human GC and adjacent tissues using microarray assays and qRT-PCR, while the clinicopathological characteristics of patients with GC were used to assess its diagnostic and prognostic value. The circTMC5/miR-361-3p/RABL6 axis was examined in vitro and vivo, and the immune roles of RABL6 were evaluated using bioinformatics analyses and immunohistochemistry (IHC). RESULTS: CircTMC5 was highly expressed in GC tissues, plasma, and cell lines, and was closely related to histological grade, pathological stage, and T classification in patients with GC. CircTMC5 expression was also an independent prognostic factor for GC and its combined detection with carcinoembryonic antigen may improve GC diagnosis. Low circTMC5 expression correlated with good prognosis, inhibited GC cell proliferation, and promoted apoptosis. Mechanistically, circTMC5 overexpression promoted GC cell proliferation, invasion, and metastasis but inhibited apoptosis by sponging miR-361-3p and up-regulating RABL6 in vitro and vivo, whereas miR-361-3p up-regulation had the opposite effects. RABL6 was highly expressed in GC and was involved in immune regulation and infiltration in GC. CONCLUSIONS: CircTMC5 promotes GC and sponges miR-361-3p to up-regulate RABL6 expression, thus may have diagnostic and prognostic value in GC. RABL6 also displays therapeutic promise due to its role in the immune regulation of GC.
Authors: Thomas B Hansen; Trine I Jensen; Bettina H Clausen; Jesper B Bramsen; Bente Finsen; Christian K Damgaard; Jørgen Kjems Journal: Nature Date: 2013-02-27 Impact factor: 49.962