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Qiao L, Dong C, Jia W, Sun G. RAB5A in triple-negative breast cancer: a critical role in macrophage reshaping in an exosomal miR-21-dependent manner. Endocr Relat Cancer 2024; 31:e230257. [PMID: 38470169 PMCID: PMC11046356 DOI: 10.1530/erc-23-0257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 03/12/2024] [Indexed: 03/13/2024]
Abstract
Breast cancer is the leading cause of cancer-related deaths in females, and triple-negative breast cancer (TNBC) is characterized as one of the main subtypes of breast cancer, with poor prognosis and limited treatments. Investigating the molecular basis or discovering relevant oncogenes will greatly help in developing effective targeted therapies. In this study, we ascertained that RAB5A depletion in TNBC cells suppresses the secretion of exosomes and blocks the polarization of macrophages toward an M2 phenotype. By scanning miRNAs associated with macrophage polarization, we identified that miR-21 was the pivotal component in tumor cell-derived exosomes and played a key role in RAB5A-mediated macrophage polarization. The enhanced expression of miR-21 in macrophages is able to potentiate the M2 polarization of macrophages in the presence of tumor cells. Pellino-1 (PELI1) was subsequently identified as the target of miR-21, and forced PELI1 expression partially abrogated the M2 polarization of macrophages induced by miR-21 overexpression. Macrophages stimulated with RAB5A-depleted TNBC cells (coculture, conditioned medium or exosomes) impaired their capability to promote the proliferation, migration, and invasion of tumor cells. In vivo xenograft experiments further confirmed that RAB5A knockdown TNBC cells exhibited reduced tumor formation and impaired tumor-associated macrophage recruitment. These studies shed light on the potential underlying mechanism of RAB5A-mediated macrophage polarization in an exosomal miR-21-dependent manner and provide an experimental basis for the development of RAB5A- or exosome-based tumor therapeutic strategies.
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Affiliation(s)
- Lei Qiao
- Department of Breast and Thyroid Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang Uygur Autonomous Region, China
| | - Chao Dong
- Department of Breast and Thyroid Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang Uygur Autonomous Region, China
| | - Wenlei Jia
- Department of Breast and Thyroid Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang Uygur Autonomous Region, China
| | - Gang Sun
- Department of Breast and Thyroid Surgery, Xinjiang Medical University Affiliated Tumor Hospital, Urumqi, Xinjiang Uygur Autonomous Region, China
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Liu S, Wang K, Zhao Z, Pang Y, Liu F, Wang P, Wang Z, Yang X. miR-451a suppresses the proliferation and migration of high-grade serous ovarian cancer by targeting RAB5A through the Ras/Raf/MEK/ERK pathway. J Gene Med 2024; 26:e3649. [PMID: 38282155 DOI: 10.1002/jgm.3649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 10/20/2023] [Accepted: 11/17/2023] [Indexed: 01/30/2024] Open
Abstract
BACKGROUND Ovarian cancer is one of the most common cancers in women. Profiles changes of microRNAs (miRNAs) are closely linked to malignant tumors. In the present study, we investigated expression of miR-451a in high-grade serous ovarian cancer (HGSOC). We also investigated the potential pathological roles and the likely mechanism of miR-451a in the development of HGSOC using animal models and cell lines. METHODS Using bioinformatics techniques and a real-time PCR, we analyzed differently expressed miRNAs in HGSOC compared to normal tissue. MTT (i.e. 3-[4, 5-dimethyl thiazol-2-yl]-2,5-diphenyl tetrazolium bromide), EDU (i.e. 5-ethynyl-2'-deoxyuridine) and transwell assays were performed to investigate the effect of miR-451a on the proliferation and migration of HGSOC SKOV-3 cells. A dual luciferase reporter assay was performed to verify the targeting relationship of miR-451 and RAB5A (one of the Rab GTPase proteins that regulates endocytosis and vesicle transport). Also, we analyzed levels of the RAB5A mRNA and protein by real-time PCR, western blotting and immunohistochemistry assays in HGSOC cells and tissues. Finally, we performed in vivo experiments using HGSOC mice. RESULTS miR-451a was substantially upregulated in HGSOC and associated with favorable clinical characteristics. miR-451a knockdown significantly increased growth and metastasis of HGSOC cell line SKOV-3 through Ras/Raf/mitogen-activated protein kinase kinase (MEK)/extracellular signal-regulated kinase (ERK) signaling. In addition, RAB5A, an early endosome marker, was shown to be a direct target of miR-451a. Moreover, RAB5A is correlated with unfavorable clinical features and shows independent prognostic significance in HGSOC. CONCLUSIONS We found that the miR-451a/RAB5A axis is associated with tumorigenesis and progression through the Ras/Raf/MEK/ERK pathway, providing prognostic indicators and therapeutic targets for patients with HGSOC.
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Affiliation(s)
- Shujie Liu
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Kun Wang
- Department of Gynecology, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Zhendan Zhao
- Department of Ultrasound Medcine, Shandong Provincial Hospital affiliated to Shandong First Medical University, Jinan, China
| | - Yu Pang
- Department of Pathology, The Afliated Taian City Central Hospital of Qingdao University, Tai'an, China
| | - Fang Liu
- Department of Gastroenterology, The Afliated Taian City Central Hospital of Qingdao University, Tai'an, China
| | - Pengling Wang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Zhiling Wang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Xingsheng Yang
- Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong, China
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Zhao Z, Wei Z, Zheng J, Li Z, Zou H, Wen X, Li F, Wang X, Huang Q, Zeng H, Fan H, Cai X, Zhang J, Jia B, Huang A, Lu M, Lin Y. Hepatitis B virus promotes its own replication by enhancing RAB5A-mediated dual activation of endosomal and autophagic vesicle pathways. Emerg Microbes Infect 2023; 12:2261556. [PMID: 37725090 PMCID: PMC10614717 DOI: 10.1080/22221751.2023.2261556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 09/17/2023] [Indexed: 09/21/2023]
Abstract
Chronic hepatitis B virus (HBV) infection remains one of the major global public health concerns, and it develop into liver fibrosis, cirrhosis, and hepatocellular carcinoma. Recent evidence suggests that endosomal and autophagic vesicles are beneficial for HBV replication. However, it has not been well elucidated how HBV exploits such intracellular vesicle systems for its replication. RAB5A, a member of small GTPase family, plays crucial roles in early endosome biogenesis and autophagy initiation. We observed that RAB5A mRNA and protein levels were significantly increased in HBV-expressing hepatoma cell lines as well as in liver tissue samples from chronic HBV-infected patients. Moreover, RAB5A silencing inhibited HBV replication and subviral particle (SVP) expression significantly in HBV-transfected and -infected hepatoma cells, whereas RAB5A overexpression increased them. Mechanistically, RAB5A increases HBV replication through enhancement of early endosome (EE) - late endosome (LE) activation by interacting with EEA1, as well as enhancing autophagy induction by interacting with VPS34. Additionally, HBV infection enhances RAB5A-mediated dual activation of EE-LE system and autophagy. Collectively, our findings highlight that HBV utilizes RAB5A-mediated dual activation of endosomal and autophagic vesicle pathways for its own replication and persistence. Therefore, RAB5A is a potential target for chronic HBV infection treatment.
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Affiliation(s)
- Zhenyu Zhao
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Zhen Wei
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Jiaxin Zheng
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Zhihong Li
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Hecun Zou
- Institute of Life Sciences, Chongqing Medical University, Chongqing, People’s Republic of China
| | - Xiang Wen
- Key Laboratory of Infectious and Parasitic Diseases in Chongqing, Department of Infectious Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People’s Republic of China
| | - Fahong Li
- Department of Infectious Diseases, Huashan Hospital, Fudan University, Shanghai, People’s Republic of China
| | - Xueyu Wang
- Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Qian Huang
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Huaqing Zeng
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Hui Fan
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Xuefei Cai
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Jiming Zhang
- Department of Infectious Diseases, Huashan Hospital, Fudan University, Shanghai, People’s Republic of China
| | - Bei Jia
- Key Laboratory of Infectious and Parasitic Diseases in Chongqing, Department of Infectious Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People’s Republic of China
| | - Ailong Huang
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
| | - Mengji Lu
- Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Yong Lin
- Key Laboratory of Molecular Biology of Infectious Diseases (Chinese Ministry of Education), Chongqing Medical University, Chongqing, People’s Republic of China
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Shen D, Lin J, Xie Y, Zhuang Z, Xu G, Peng S, Tang G, Bai L, Zhu M, Zhang Y, Huang Z, Wang P, Liu X, Huang M, Luo Y, Wang X, Yu H. RNA demethylase ALKBH5 promotes colorectal cancer progression by posttranscriptional activation of RAB5A in an m6A-YTHDF2-dependent manner. Clin Transl Med 2023; 13:e1279. [PMID: 37203239 DOI: 10.1002/ctm2.1279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 05/08/2023] [Accepted: 05/12/2023] [Indexed: 05/20/2023] Open
Abstract
BACKGROUND N6-methyladenosine (m6A) modification is an emerging epigenetic regulatory mechanism in tumourigenesis. Considering that AlkB homolog 5 (ALKBH5) is a well-described m6A demethylase in previous enzyme assays, we aimed to investigate the role of m6A methylation alteration conferred by disturbed ALKBH5 in colorectal cancer (CRC) development. METHODS Expression of ALKBH5 and its correlation with clinicopathological characteristics of CRC were evaluated using the prospectively maintained institutional database. The molecular role and underlying mechanism of ALKBH5 in CRC were explored using in vitro and in vivo experiments with methylated RNA immunoprecipitation sequencing (MeRIP-seq), RNA-seq, MeRIP-qPCR, RIP-qPCR and luciferase reporter assays. RESULTS ALKBH5 expression was significantly upregulated in CRC tissues compared to the paired adjacent normal tissues, and higher expression of ALKBH5 was independently associated with worse overall survival in CRC patients. Functionally, ALKBH5 promoted the proliferative, migrative and invasive abilities of CRC cells in vitro and enhanced subcutaneous tumour growth in vivo. Mechanistically, RAB5A was identified as the downstream target of ALKBH5 in CRC development, and ALKBH5 posttranscriptionally activated RAB5A by m6A demethylation, which impeded the YTHDF2-mediated degradation of RAB5A mRNA. In addition, we demonstrated that dysregulation of the ALKBH5-RAB5A axis could affect the tumourigenicity of CRC. CONCLUSIONS ALKBH5 facilitates the progression of CRC by augmenting the expression of RAB5A via an m6A-YTHDF2-dependent manner. Our findings suggested that ALKBH5-RAB5A axis might serve as valuable biomarkers and effective therapeutic targets for CRC.
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Affiliation(s)
- Dingcheng Shen
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Jinxin Lin
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yumo Xie
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Zhuokai Zhuang
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Gaopo Xu
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shaoyong Peng
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Guannan Tang
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Liangliang Bai
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Mingxuan Zhu
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yu Zhang
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Ziying Huang
- Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Puning Wang
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Xiaoxia Liu
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Meijin Huang
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yanxin Luo
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Xiaolin Wang
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Huichuan Yu
- Department of Colorectal Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Institute of Gastroenterology, Guangzhou, Guangdong, China
- Department of General Surgery, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
- Guangdong Provincial Key Laboratory of Colorectal and Pelvic Floor Diseases, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China
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Ji J, Li C, Wang J, Wang L, Huang H, Li Y, Fang J. Hsa_circ_0001756 promotes ovarian cancer progression through regulating IGF2BP2-mediated RAB5A expression and the EGFR/MAPK signaling pathway. Cell Cycle 2022; 21:685-696. [PMID: 35113003 PMCID: PMC8973336 DOI: 10.1080/15384101.2021.2010166] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Hsa_circ_0001756 was reported to be upregulated in serum samples of ovarian cancer (OC) patients and may serve as a potential OC biomarker. This study aimed to investigate the role and molecular mechanisms of hsa_circ_0001756 in OC procession. Herein, we detected the expression of hsa_circ_0001756 in OC tissues and cell lines with RT-qPCR assay, which showed that hsa_circ_0001756 was upregulated in OC tissues and cell lines. Then small interfering RNA targeting hsa_circ_0001756 (si-hsa_circ_0001756) was transfected into SKOV3 and A2780 cells, and the proliferation, invasion, and expression of epithelial-mesenchymal transition (EMT) marker proteins were determined with CCK-8, Transwell and Western blotting assays, respectively. We found that hsa_circ_0001756 knockdown inhibited OC cell proliferation, invasion and EMT. Moreover, RNA pull-down assay verified the binding between hsa_circ_0001756 and IGF2 mRNA binding protein 2 (IGF2BP2), and rescue experiments indicated that IGF2BP2 overexpression reversed the effects of has_circ_0001756 knockdown on OC cell functions. Co-IP assay verified IGF2BP2 could interact with RAB GTPase 5A (RAB5A) protein. Then SKOV3 cells were transfected with si-IGF2BP2 alone or together with pcDNA-RAB5A, followed by the detection of SKOV3 cell functions. We found that IGF2BP2 knockdown inhibited OC cell proliferation, invasion, and EMT, while RAB5A overexpression reversed these effects. Finally, SKOV3 cells transfected with si-hsa_circ_0001756 were injected into nude mice through tail vein. Hsa_circ_0001756 knockdown significantly inhibited the xenograft tumor growth of OC in vivo. In conclusion, hsa_circ_0001756 knockdown inhibits OC cell proliferation, invasion, and EMT, and reduces xenograft tumor growth by suppressing IGF2BP2-mediated RAB5A expression and blocking the EGFR/MAPK signaling pathway.
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Affiliation(s)
- Jing Ji
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Chen Li
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Jinfeng Wang
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Lei Wang
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
| | - Huifang Huang
- Department of Gynecology, The Northwest Women’s and Children’s Hospital, Xi’an, Shaanxi, China
| | - Ying Li
- Department of Radiology, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi, China,CONTACT Ying Li Department of Radiology, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi710077, China; Jing Fang Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi 710061, China
| | - Jing Fang
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Zhang L, Chen H, Tian C, Zheng D. Propofol Represses Cell Growth and Metastasis by Modulating the Circular RNA Non-SMC Condensin I Complex Subunit G/MicroRNA-200a-3p/ RAB5A Axis in Glioma. World Neurosurg 2021; 153:e46-e58. [PMID: 34129971 DOI: 10.1016/j.wneu.2021.06.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 06/02/2021] [Accepted: 06/03/2021] [Indexed: 12/24/2022]
Abstract
BACKGROUND Glioma is a common primary intracranial tumor, with high infiltration and aggression. Propofol (Pro) is associated with growth and metastasis in glioma. Meanwhile, circular RNA non-SMC condensin I complex subunit G (circNCAPG; hsa_circ_0007244) has been reported to be upregulated in glioma. This study explored the role and mechanism of circNCAPG in Pro-induced glioma progression. METHODS Cell viability was determined by cell counting kit-8 assay. Levels of circNCAPG, microRNA-200a-3p (miR-200a-3p), and member RAS oncogene family (RAB5A) were detected by real-time quantitative polymerase chain reaction. Colony number, apoptosis, migration, and invasion were analyzed by colony formation, flow cytometry, wound healing, and transwell assays. Matrix metallopeptidase 2, matrix metallopeptidase 9, and RAB5A protein levels were detected by Western blot assay. The binding relationship between miR-200a-3p and circNCAPG or RAB5A was predicted by starBase 2.0 and then verified by a dual-luciferase reporter and RNA immunoprecipitation assays. The biological roles of circNCAPG and Pro on glioma tumor growth were examined by the xenograft tumor model in vivo. RESULTS Expression of circNCAPG and RAB5A was upregulated, and miR-200a-3p was decreased in glioma tissues and cells, while their expression presented an opposite trend in Pro-treated glioma cells. Moreover, circNCAPG overexpression could abolish Pro-mediated proliferation, apoptosis, migration, and invasion in glioma cells in vitro. Mechanically, circNCAPG could regulate RAB5A expression by sponging miR-200a-3p. Pro blocked glioma tumor growth in vivo by modulating circNCAPG. CONCLUSIONS Pro could inhibit glioma cell growth and metastasis through the circNCAPG/miR-200a-3p/RAB5A axis, providing a promising therapeutic strategy for glioma treatment.
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Affiliation(s)
- Li Zhang
- Department of Anesthesiology, The First Hospital of Hebei Medicine University, Shijiazhuang, China
| | - Hao Chen
- Department of Anesthesiology, The First Hospital of Hebei Medicine University, Shijiazhuang, China
| | - Changzheng Tian
- Department of Anesthesiology, The First Hospital of Hebei Medicine University, Shijiazhuang, China.
| | - Deli Zheng
- Department of Anesthesiology, The First Hospital of Hebei Medicine University, Shijiazhuang, China
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Gorji-Bahri G, Moghimi HR, Hashemi A. RAB5A effect on metastasis of hepatocellular carcinoma cell line via altering the pro-invasive content of exosomes. Exp Mol Pathol 2021; 120:104632. [PMID: 33831402 DOI: 10.1016/j.yexmp.2021.104632] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 03/12/2021] [Accepted: 03/14/2021] [Indexed: 12/24/2022]
Abstract
Tumor microenvironment exerts a critical role in cancer progression and metastasis. Exosomes, cell-cell communicators and major players of the tumor microenvironment are considered as a serious mediator of cancer metastasis. Here, we determined the effect of RAB5A gene on the hepatocellular carcinoma (HCC) cells particularly whether RAB5A could affect HCC metastasis via regulating the pro-invasive content of exosomes. In response to RAB5A knockdown, we analyzed the proliferation rate and migration capability of HCC cells. Then, we estimated changes in the total protein composition of exosomes via analyzing the expression of exosomal markers, CD63 and Alix. Thereafter, alterations of the pro-invasive content of exosomes were functionally evaluated using matrigel invasion assay. Our results revealed that knockdown of RAB5A could decrease HCC cell proliferation rate and migration capability significantly. Moreover, no significant changes in the expression of exosomal CD63 and Alix reflected that no differences might be occurred in protein composition of RAB5A knockdown cell-derived exosomes. Matrigel invasion assay functionally showed that exosomes-derived from RAB5A knockdown cells still had pro-invasive properties and their pro-invasive content was not affected in response to RAB5A knockdown. In conclusion, we believe that our results propose a new explanation about RAB5A and metastatic potentials of exosomes-derived from HCC cells.
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Affiliation(s)
- Gilar Gorji-Bahri
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Hamid Reza Moghimi
- Department of Pharmaceutics and Nanotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Protein Technology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Atieh Hashemi
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Yuan Z, Wei W. RAB5A promotes the formation of filopodia in pancreatic cancer cells via the activation of cdc42 and β1-integrin. Biochem Biophys Res Commun 2021; 535:54-59. [PMID: 33341673 DOI: 10.1016/j.bbrc.2020.12.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 12/10/2020] [Indexed: 01/27/2023]
Abstract
Filopodia are slender actin-rich plasma membrane protrusions that function to drive cell migration and invasion. Despite the observation of defective filopodia formation in many malignant tumors, the regulation mechanism remained unknown to date. In the present study, for the first time, we demonstrate that RAB5A, a Rab GTPase family protein, is a potent regulator of filopodia formation in pancreatic cancer cells. High expression of RAB5A was associated with filopodia formation and migration in pancreatic cancer cells. Overexpression of RAB5A promoted filopodia formation and migration in CF Pac-1 cells. In contrast, down-regulation of RAB5A expression in SW1990 cells with a high endogenous RAB5A expression level impeded the formation of filopodia. Further analysis indicated that RAB5A was required for cdc42 activation in CF Pac-1 and SW1990 cells. Moreover, to investigate the underlying mechanism by which the activation of cdc42 mediates RAB5A-induced filopodia formation, the active state of β1-integrin was examined in cells with different expression levels of RAB5A. We observed that RAB5A regulated the accumulation of the active β1-integrin. We demonstrated that down-regulation of the expression of β1-integrin strongly suppressed filopodia formation and cdc42 activation mediated by RAB5A. These results indicate the important role of RAB5A in the regulation of filopodia formation in pancreatic cancer cells, which is dependent on the activation of cdc42 and β1-integrin.
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Affiliation(s)
- Ziyan Yuan
- Experimental Animal Center, Naval Medical University, Shanghai, People's Republic of China
| | - Wei Wei
- Clinical Research Center, Changhai Hospital, Naval Medical University, Shanghai, People's Republic of China.
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Wu YJ, Yang QS, Chen H, Wang JT, Wang WB, Zhou L. Long non‑coding RNA CASC19 promotes glioma progression by modulating the miR‑454‑3p/ RAB5A axis and is associated with unfavorable MRI features. Oncol Rep 2020; 45:728-737. [PMID: 33416169 DOI: 10.3892/or.2020.7876] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 06/23/2020] [Indexed: 11/05/2022] Open
Abstract
Glioma is one of the most common malignancies of the nervous system. Long non‑coding RNAs (lncRNAs) are regulators involved in the progression of tumors. The present study aimed to determine the role of lncRNA cancer susceptibility 19 (CASC19) in glioma and its underlying molecular mechanism. Reverse transcription‑quantitative PCR was performed to detect CASC19 and microRNA (miR)‑454‑3p expression in glioma and normal brain tissues. Ras‑related protein in brain 5A (RAB5A) expression in glioma cells was also analyzed via western blotting. The relationship between CASC19 expression, clinicopathological parameters and MRI characteristics in patients with glioma was analyzed. Cell Counting Kit‑8, BrdU, wound healing and Transwell assays were adopted to detect glioma cell proliferation, migration and invasion, respectively. The dual‑luciferase reporter gene and RNA immunoprecipitation experiments were conducted to verify the targeting relationship between CASC19 and miR‑454‑3p, and between miR‑454‑3p and RAB5A. The results revealed that CASC19 expression was significantly upregulated in glioma tissues and cell lines. CASC19 expression was also positively associated with tumor diameter and pathological grade. Additionally, its high expression was closely associated with tumor MRI signal heterogeneity and peritumoral edema. CASC19 upregulation promoted glioma cell proliferation and metastasis, while CASC19‑knockdown demonstrated the opposite effect. CASC19 sponged miR‑454‑3p, which indirectly increased RAB5A expression. The results demonstrated that the CASC19/miR‑454‑3p/RAB5A axis is involved in the promotion of glioma progression.
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Affiliation(s)
- Yong-Juan Wu
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Qing-Song Yang
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Hui Chen
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Jiang-Tao Wang
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Wan-Bi Wang
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
| | - Ling Zhou
- Department of Radiology, Xiangyang Central Hospital Affiliated to Hubei University of Arts and Science, Xiangyang, Hubei 441021, P.R. China
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10
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Gorji-Bahri G, Moghimi HR, Hashemi A. RAB5A is associated with genes involved in exosome secretion: Integration of bioinformatics analysis and experimental validation. J Cell Biochem 2020; 122:425-441. [PMID: 33225526 DOI: 10.1002/jcb.29871] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/30/2020] [Accepted: 11/03/2020] [Indexed: 12/31/2022]
Abstract
Exosomes, as cell-cell communicators with an endosomal origin, are involved in the progression of various diseases. RAB5A, a member of the small Rab GTPases family, which is well known as a key regulator of cellular endocytosis, is expected to be involved in exosome secretion. Here, we found the impact of RAB5A on exosome secretion from human hepatocellular carcinoma cell line using a rapid yet reliable bioinformatics approach followed by experimental analysis. Initially, RAB5A and exosome secretion-related genes were gathered from bioinformatics tools, namely, CTD, COREMINE, and GeneMANIA; and published papers. Protein-protein interaction (PPI) was then constructed by the Search Tool for Retrieval of Interacting Genes (STRING) database. Among them, several genes with different combined scores were validated by the real-time quantitative polymerase chain reaction (RT-qPCR) in stable RAB5A knockdown cells. Thereafter, to validate the bioinformatics results functionally, the impact of RAB5A knockdown on exosome secretion was evaluated. Bioinformatics analysis showed that RAB5A interacts with 37 genes involved in exosome secretion regulatory pathways. Validation by RT-qPCR confirmed the association of RAB5A with candidate interacted genes and interestingly showed that even medium to low combined scores of the STRING database could be experimentally valid. Moreover, the functional analysis demonstrated that the stable silencing of RAB5A could experimentally decrease exosome secretion. In conclusion, we suggest RAB5A as a regulator of exosome secretion based on our bioinformatics approach and experimental analysis. Also, we propose the usage of PPI-derived from the STRING database regardless of their combined scores in advanced bioinformatics analysis.
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Affiliation(s)
- Gilar Gorji-Bahri
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hamid Reza Moghimi
- Department of Pharmaceutics and Nanotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Protein Technology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Atieh Hashemi
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Gao W, Qiao M, Luo K. Long Noncoding RNA TP53TG1 Contributes to Radioresistance of Glioma Cells Via miR-524-5p/ RAB5A Axis. Cancer Biother Radiopharm 2020; 36:600-612. [PMID: 32762546 DOI: 10.1089/cbr.2020.3567] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Background: Long noncoding RNAs (lncRNAs) have been reported to be important regulators in cancer. In this study, we aimed to discover the functions of lncRNA TP53TG1 in glioma. Methods: The expression of lncRNA TP53TG1, microRNA-524-5p (miR-524-5p) and RAB5A, a member RAS oncogene family (RAB5A), were examined by quantitative real-time polymerase chain reaction. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay and flow cytometry were applied to analyze the proliferation and apoptosis of glioma cells. Colony formation assay was used to detect the colony formation ability and radioresistance of glioma cells. Western blot assay was performed to detect the expression of autophagy-associated proteins and RAB5A. StarBase software was utilized to predict the combination between miR-524-5p and TP53TG1 or RAB5A, and dual-luciferase reporter assay and RNA immunoprecipitation assay were used to verify the above predictions. Animal experiment using immunodeficient nude mice was conducted to detect the role of TP53TG1 in vivo. Results: Radiation stimulation (6 Gy) upregulated the abundance of TP53TG1. TP53TG1 potentiated radioresistance and progression of glioma by promoting the autophagy. miR-524-5p was verified as a direct downstream regulation of TP53TG1. miR-524-5p depletion attenuated the influence of TP53TG1 interference on the functions of glioma cells. RAB5A was a direct target of miR-524-5p as well. The inhibitory effect of miR-524-5p on the malignancy of glioma cells was overturned by overexpression of RAB5A. RAB5A was regulated by TP53TG1/miR-524-5p signaling in glioma cells. TP53TG1 silencing impeded the progression of glioma in vivo. Conclusion: lncRNA TP53TG1 accelerated the proliferation, colony formation, autophagy, and radioresistance, and restrained the apoptosis of glioma cells through miR-524-5p/RAB5A axis.
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Affiliation(s)
- Wenjin Gao
- Department of Neurosurgery, Wuhan Puren Hospital, Wuhan, China
| | - Mu Qiao
- Department of Neurosurgery, Wuhan Puren Hospital, Wuhan, China
| | - Kuan Luo
- Department of Neurosurgery, Wuhan Puren Hospital, Wuhan, China
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Vantaggiato C, Panzeri E, Castelli M, Citterio A, Arnoldi A, Santorelli FM, Liguori R, Scarlato M, Musumeci O, Toscano A, Clementi E, Bassi MT. ZFYVE26/SPASTIZIN and SPG11/SPATACSIN mutations in hereditary spastic paraplegia types AR-SPG15 and AR-SPG11 have different effects on autophagy and endocytosis. Autophagy 2018; 15:34-57. [PMID: 30081747 DOI: 10.1080/15548627.2018.1507438] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
ZFYVE26/Spastizin and SPG11/Spatacsin encode 2 large proteins that are mutated in hereditary autosomal-recessive spastic paraplegia/paraparesis (HSP) type 15 (AR-SPG15) and type 11 (AR-SPG11), respectively. We previously have reported that AR-SPG15-related ZFYVE26 mutations lead to autophagy defects with accumulation of immature autophagosomes. ZFYVE26 and SPG11 were found to be part of a complex including the AP5 (adaptor related protein complex 5) and to have a critical role in autophagic lysosomal reformation with identification of autophagic and lysosomal defects in cells with both AR-SPG15- and AR-SPG11-related mutations. In spite of these similarities between the 2 proteins, here we report that ZFYVE26 and SPG11 are differently involved in autophagy and endocytosis. We found that both ZFYVE26 and SPG11 interact with RAB5A and RAB11, 2 proteins regulating endosome trafficking and maturation, but only ZFYVE26 mutations affected RAB protein interactions and activation. ZFYVE26 mutations lead to defects in the fusion between autophagosomes and endosomes, while SPG11 mutations do not affect this step and lead to a milder autophagy defect. We thus demonstrate that ZFYVE26 and SPG11 affect the same cellular physiological processes, albeit at different levels: both proteins have a role in autophagic lysosome reformation, but only ZFYVE26 acts at the intersection between endocytosis and autophagy, thus representing a key player in these 2 processes. Indeed expression of the constitutively active form of RAB5A in cells with AR-SPG15-related mutations partially rescues the autophagy defect. Finally the model we propose demonstrates that autophagy and the endolysosomal pathway are central processes in the pathogenesis of these complicated forms of hereditary spastic paraparesis. Abbreviations: ALR, autophagic lysosome reformation; AP5, adaptor related protein complex 5; AR, autosomal-recessive; HSP, hereditary spastic paraplegia/paraparesis; ATG14, autophagy related 14; BafA, bafilomycin A1; BECN1, beclin 1; EBSS, Earle balanced salt solution; EEA1, early endosome antigen 1; EGF, epidermal growth factor; EGFR, epidermal growth factor receptor; GDP, guanosine diphosphate; GFP, green fluorescent protein; GTP, guanosine triphosphate; HSP, hereditary spastic paraplegias; LBPA, lysobisphosphatidic acid; MAP1LC3B/LC3B, microtubule associated protein 1 light chain 3 beta; MVBs, multivesicular bodies; PIK3C3, phosphatidylinositol 3-kinase, catalytic subunit type 3; PIK3R4, phosphoinositide-3-kinase regulatory subunit 4; PtdIns3P, phosphatidylinositol-3-phosphate; RFP, red fluorescent protein; RUBCN, RUN and cysteine rich domain containing beclin 1 interacting protein; shRNA, short hairpin RNA; SQSTM1/p62, sequestosome 1; TCC: thin corpus callosum; TF, transferrin; UVRAG, UV radiation resistance associated.
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Affiliation(s)
- Chiara Vantaggiato
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
| | - Elena Panzeri
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
| | - Marianna Castelli
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
| | - Andrea Citterio
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
| | - Alessia Arnoldi
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
| | | | - Rocco Liguori
- c Department of Biomedical and Neuromotor Sciences , University of Bologna; IRCCS Institute of Neurological Sciences , Bologna , Italy
| | - Marina Scarlato
- d Dept. of Neurosciences and Institute of Experimental Neurology (INSpe) , San Raffaele Scientific Institute , Milan , Italy
| | - Olimpia Musumeci
- e Department of Clinical and Experimental Medicine , University of Messina , Messina , Italy
| | - Antonio Toscano
- e Department of Clinical and Experimental Medicine , University of Messina , Messina , Italy
| | - Emilio Clementi
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy.,f Unit of Clinical Pharmacology, CNR Institute of Neuroscience, Department of Biomedical and Clinical Sciences , University Hospital "Luigi Sacco", Università di Milano , Milan , Italy
| | - Maria Teresa Bassi
- a Scientific Institute, IRCCS E. Medea, Laboratory of Molecular Biology , Bosisio Parini , Lecco , Italy
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Pan Y, Wang R, Zhang F, Chen Y, Lv Q, Long G, Yang K. MicroRNA-130a inhibits cell proliferation, invasion and migration in human breast cancer by targeting the RAB5A. Int J Clin Exp Pathol 2015; 8:384-393. [PMID: 25755726 PMCID: PMC4348820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 12/22/2014] [Indexed: 06/04/2023]
Abstract
MiR-130a has been demonstrated to play important roles in many types of cancers. Nevertheless, its biological function in breast cancer remains largely unknown. In this study, we found that the expression level of miR-130a was down-regulated in breast cancer tissues and cells. Overexpression of miR-130a was able to inhibit cell proliferation, invasion and migration in MCF7 and MDA-MB-435 cells. With the bioinformatics analysis, we further identified that RAB5A was a directly target of miR-130a, and its mRNA and protein level was negatively regulated by miR-130a. Immunohistochemistry verified RAB5A was upregulated in breast cancer tissues. Therefore, the data reported here demonstrate that miR-130a is an important tumor suppressor in breast cancer, and imply that miR-130a/RAB5A axis have potential as therapeutic targets for breast cancer.
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Affiliation(s)
- Yuanqing Pan
- Institute of Medical Psychology, Evidence-Based Medicine Center, Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, School of Basic Medical SciencesLanzhou, Gansu, China
| | - Renjie Wang
- Department of Clinical Laboratory, Pingjin Hospital, Logistics College of Armed Police ForcesTianjin, China
| | - Fengwa Zhang
- Second Department of Gynaecology, Gansu Province People’s HospitalLanzhou, Gansu, China
| | - Yonglin Chen
- Department of Pathology, First Affiliated Hospital of Lanzhou UniversityLanzhou, Gansu, China
| | - Qingfang Lv
- Department of radiology, The Tumor Hospital of Gansu ProvinceLanzhou, Gansu, China
| | - Ge Long
- Evidence-Based Medicine Center, Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, School of Basic Medical SciencesLanzhou, Gansu, China
| | - Kehu Yang
- Evidence-Based Medicine Center, Key Laboratory of Evidence Based Medicine and Knowledge Translation of Gansu Province, School of Basic Medical SciencesLanzhou, Gansu, China
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Lu Y, Dong S, Hao B, Li C, Zhu K, Guo W, Wang Q, Cheung KH, Wong CWM, Wu WT, Markus H, Yue J. Vacuolin-1 potently and reversibly inhibits autophagosome-lysosome fusion by activating RAB5A. Autophagy 2014; 10:1895-905. [PMID: 25483964 PMCID: PMC4502727 DOI: 10.4161/auto.32200] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [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] [Indexed: 11/19/2022] Open
Abstract
Autophagy is a catabolic lysosomal degradation process essential for cellular homeostasis and cell survival. Dysfunctional autophagy has been associated with a wide range of human diseases, e.g., cancer and neurodegenerative diseases. A large number of small molecules that modulate autophagy have been widely used to dissect this process and some of them, e.g., chloroquine (CQ), might be ultimately applied to treat a variety of autophagy-associated human diseases. Here we found that vacuolin-1 potently and reversibly inhibited the fusion between autophagosomes and lysosomes in mammalian cells, thereby inducing the accumulation of autophagosomes. Interestingly, vacuolin-1 was less toxic but at least 10-fold more potent in inhibiting autophagy compared with CQ. Vacuolin-1 treatment also blocked the fusion between endosomes and lysosomes, resulting in a defect in general endosomal-lysosomal degradation. Treatment of cells with vacuolin-1 alkalinized lysosomal pH and decreased lysosomal Ca2+ content. Besides marginally inhibiting vacuolar ATPase activity, vacuolin-1 treatment markedly activated RAB5A GTPase activity. Expression of a dominant negative mutant of RAB5A or RAB5A knockdown significantly inhibited vacuolin-1-induced autophagosome-lysosome fusion blockage, whereas expression of a constitutive active form of RAB5A suppressed autophagosome-lysosome fusion. These data suggest that vacuolin-1 activates RAB5A to block autophagosome-lysosome fusion. Vacuolin-1 and its analogs present a novel class of drug that can potently and reversibly modulate autophagy.
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Key Words
- ATG, autophagy-related
- BAF, bafilomycin A1
- CQ, chloroquine
- CTSB, cathepsin B
- CTSL, cathepsin L
- EGFR, epidermal growth factor receptor
- GFP, green fluorescent protein
- GPN, glycyl-l-phenylalanine 2-naphthylamide
- LAMP1, lysosomal-associated membrane protein 1
- Leup, leupeptin
- MAP1LC3, microtubule-associated protein 1 light chain 3
- MTOR, mechanistic target of rapamycin
- RAB5A
- RFP, red fluorescent protein
- autophagosomes
- endosomes
- lysosomes
- pH
- tfLC3, tandem fluorescence-tagged LC3
- vacuolin-1
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Affiliation(s)
- Yingying Lu
- a Department of Biomedical Sciences ; City University of Hong Kong ; Hong Kong , China
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Li Y, Zhao Y, Hu J, Xiao J, Qu L, Wang Z, Ma D, Chen Y. A novel ER-localized transmembrane protein, EMC6, interacts with RAB5A and regulates cell autophagy. Autophagy 2012. [PMID: 23182941 DOI: 10.4161/auto.22742] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Autophagy is mediated by a unique organelle, the autophagosome, which encloses a portion of the cytoplasm for delivery to the lysosome. Phosphatidylinositol 3-phosphate (PtdIns3P) produced by the class III phosphatidylinositol 3-kinase (PtdIns3K) complex is essential for canonical autophagosome formation. RAB5A, a small GTPase localized to early endosomes, has been shown to associate with the class III PtdIns3K complex, regulate its activity and promote autophagosome formation. However, little is known about how endosome-localized RAB5A functions with the class III PtdIns3K complex. Here we identified a novel endoplasmic reticulum (ER)-localized transmembrane protein, ER membrane protein complex subunit 6 (EMC6), which interacted with both RAB5A and BECN1/Beclin 1 and colocalized with the omegasome marker ZFYVE1/DFCP1. It was shown to regulate autophagosome formation, and its deficiency caused the accumulation of autophagosomal precursor structures and impaired autophagy. Our study showed for the first time that EMC6 is a novel regulator involved in autophagy.
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Affiliation(s)
- Yanjun Li
- Key Laboratory of Medical Immunology, Ministry of Health, Peking University Health Science Center, Beijing, China
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Li ZG, Li XD, Dong XS, Pang HG, Du J. Significance of RAB5A and CD44v9 expression in colorectal cancer tissues. Shijie Huaren Xiaohua Zazhi 2006; 14:848-852. [DOI: 10.11569/wcjd.v14.i9.848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the expression of RAB5A and CD44v9 and their significances in colorectal cancer.
METHODS: SP immunohistochemical method was adopted to detect the expression of RAB5A and CD44v9 proteins in the pathological paraffin sections from colorectal cancer (n = 43). RNA samples of 60 fresh tissues excised from patients with colorectal cancer were extracted and reversely transcribed into cDNAs, and then real-time polymerase chain reaction (RT-PCR) was used to detect the expression of RAB5A and CD44v9 genes. The correlations of RAB5A and CD44v9 expression with the differentiation and metastasis of colorectal cancer were analyzed.
RESULTS: RAB5A protein was positively expressed in cytoplasm cell membrane with a rate of 100%, while CD44v9 protein was positively expressed only in cytoplasm with a rate of 86.7%. RT-PCR results showed that Tm of each sample was coincided with that of positive control by melting curve analysis. The expression of RAB5A cDNA was lower in highly and moderately differentiated cancers than that of poorly differentiated ones (P < 0.01), and it was also lower in cancers without lymph node metastasis than that with lymph node metastasis (P < 0.01). The expression of CD44v9 gene and protein were positively related to those of RAB5A (χ2 = 14.532, P < 0.01).
CONCLUSION: The expression of RAB5A and CD44v9 are correlated with the differentiation and metastasis of colorectal cancer, which may play important roles in the signal transduction across cellular membrane and matrix invasion.
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