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Xu P, Xu X, Wu X, Zhang L, Meng L, Chen Z, Han W, Yao J, Xu AM. CircTMC5 promotes gastric cancer progression and metastasis by targeting miR-361-3p/ RABL6. Gastric Cancer 2022; 25:64-82. [PMID: 34296378 DOI: 10.1007/s10120-021-01220-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 07/15/2021] [Indexed: 02/07/2023]
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.
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Affiliation(s)
- Peng Xu
- Department of General Surgery, The Fourth Affiliated Hospital of Anhui Medical University, No. 100 Huaihai Avenue, Xinzhan District, Hefei City, 230000, Anhui Province, China.,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
| | - XiaoLan Xu
- Department of Critical Care Medicine, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, 225001, China
| | - Xiao Wu
- Department of Pathophysiology, Basic Medical College of Anhui Medical University, Anhui Provincial Key Laboratory of Pathophysiology, Hefei, 230022, China
| | - LiXiang Zhang
- Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China
| | - Lei Meng
- Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China
| | - ZhangMing Chen
- Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China
| | - WenXiu Han
- Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China
| | - Jie Yao
- 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.
| | - AMan Xu
- Department of General Surgery, The Fourth Affiliated Hospital of Anhui Medical University, No. 100 Huaihai Avenue, Xinzhan District, Hefei City, 230000, Anhui Province, China. .,Department of General Surgery, The First Affiliated Hospital of Anhui, Medical University, Hefei, 230022, China.
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Feng Y, Yan S, Huang Y, Huang Q, Wang F, Lei Y. High expression of RABL6 promotes cell proliferation and predicts poor prognosis in esophageal squamous cell carcinoma. BMC Cancer 2020; 20:602. [PMID: 32600359 PMCID: PMC7325041 DOI: 10.1186/s12885-020-07068-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 06/15/2020] [Indexed: 12/23/2022] Open
Abstract
Background Esophageal squamous cell carcinoma (ESCC) is a common malignant carcinoma of digestive system with high mortality. RAB, member RAS oncogene family like 6 (RABL6), a member of the RAS subfamily, has been reported as an important molecule in several cancers. However, its potential role in ESCC still remains unclear. Methods RABL6 mRNA expression was detected in 93 frozen ESCC samples using quantitative reverse transcription-polymerase chain reaction (qRT-PCR). Immunohistochemistry was applied to evaluate the RABL6 expression in tissue microarray containing 171 pairs of ESCC tissues and paired para-cancerous tissues. We evaluated RABL6 expression and its correlation with clinicopathological characteristics and survival. Subsequently, the impact of RABL6 knockdown on the ability of cell proliferation, apoptosis, migration and epithelial-mesenchymal transition (EMT) of ESCC cells was investigated by MTS, Focus formation, flow cytometry, Transwell assays, qRT-PCR, western blot, inverted microscope observation and phalloidin staining, respectively. Results Compared to paired para-cancerous tissues, RABL6 was highly expressed in ESCC. The RABL6 high-expression was associated with worse prognosis. We also revealed silencing of RABL6 caused inhibition of cell proliferation, invasion and migration. Further experiments demonstrated that knockdown of RABL6 suppressed the aggressive biological activities of ESCC by suppressing EMT in ESCC cells. Conclusions RABL6 functions as a tumor oncogene in ESCC. It would be a potential biomarker predicting prognosis, and a novelty target for ESCC therapy.
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Affiliation(s)
- Yanfen Feng
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China.,Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Shumei Yan
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China.,Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Yuhua Huang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China.,Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Qitao Huang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China.,Department of Pathology, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China
| | - Fang Wang
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060, Guangdong, China. .,Department of Molecular Diagnostics, Sun Yat-sen University Cancer Center, Guangzhou, 510060, China.
| | - Yiyan Lei
- Department of Thoracic Surgery, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, 510080, People's Republic of China.
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de Goede C, Yue WW, Yan G, Ariyaratnam S, Chandler KE, Downes L, Khan N, Mohan M, Lowe M, Banka S. Role of reverse phenotyping in interpretation of next generation sequencing data and a review of INPP5E related disorders. Eur J Paediatr Neurol 2016; 20:286-295. [PMID: 26748598 DOI: 10.1016/j.ejpn.2015.11.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 11/05/2015] [Accepted: 11/23/2015] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Next Generation Sequencing (NGS) is a useful tool in diagnosis of rare disorders but the interpretation of data can be challenging in clinical settings. We present results of extended studies on a family of multiple members with global developmental delay and learning disability, where another research group postulated the underlying cause to be a homozygous RABL6 missense variant. METHODS AND RESULTS Using data from the Exome Variant Server, we show that missense RABL6 variants are unlikely to cause early onset rare developmental disorder. Protein structural analysis, cellular functional studies and reverse phenotyping proved that the condition in this family is due to a homozygous INPP5E mutation. An in-depth review of mutational and phenotypic spectrum associated with INPP5E demonstrated that mutations in this gene lead to a range of cilliopathy-phenotypes. DISCUSSION We use this study as an example to demonstrate the importance of careful clinical evaluation of multiple family members, reverse phenotyping, considering the unknown phenotypic variability of rare diseases, utilizing publically available genomic databases and conducting appropriate bioinformatics and functional studies while interpreting results from NGS in uncertain cases. We emphasize that interpretation of NGS data is an iterative process and its dynamic nature should be explained to patients and families. Our study shows that developmental delay, intellectual disability, hypotonia and ocular motor apraxia are common in INPP5E-related disorders and considerable intra-familial phenotypic variability is possible. We have compiled the INPP5E mutational spectrum and provided novel insights into their molecular mechanisms.
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Affiliation(s)
- Christian de Goede
- Department of Paediatric Neurology, Royal Preston Hospital, Lancashire Teaching Hospitals NHS Foundation Trust, Preston, UK; Faculty of Health and Medicine, Lancaster University, Lancaster, UK
| | - Wyatt W Yue
- Structural Genomics Consortium, Old Road Campus Research Building, University of Oxford, Oxford, UK
| | - Guanhua Yan
- Faculty of Life Sciences, University of Manchester, UK
| | - Shyamala Ariyaratnam
- Department of Community and Neurodevelopmental Paediatrics, Royal Blackburn Hospital, East Lancashire Hospital NHS Trust, Blackburn, UK
| | - Kate E Chandler
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Laura Downes
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Nasaim Khan
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Meyyammai Mohan
- Department of Ophthalmology, Royal Blackburn Hospital, East Lancashire Hospital NHS Trust, Blackburn, UK
| | - Martin Lowe
- Faculty of Life Sciences, University of Manchester, UK
| | - Siddharth Banka
- Manchester Centre for Genomic Medicine, St. Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK; Manchester Centre for Genomic Medicine, Institute of Human Development, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK.
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