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Fang S, Zheng L, Chen X, Guo X, Ding Y, Ma J, Ding J, Chen W, Yang Y, Chen M, Zhao Z, Tu J, Ji J. MEX3A determines in vivo hepatocellular carcinoma progression and induces resistance to sorafenib in a Hippo-dependent way. Hepatol Int 2023; 17:1500-1518. [PMID: 37460832 DOI: 10.1007/s12072-023-10565-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 06/23/2023] [Indexed: 11/22/2023]
Abstract
BACKGROUND Hepatocellular carcinoma (HCC) is most common malignant tumor worldwide, and one of the most lethal malignancies. MEX3A, RNA-binding protein, is profoundly implicated in tumor initiation and progression. But its role and potential mechanism in HCC remains fully unclear. METHODS The expression of MEX3A in HCC was analysis using the data derived from the Cancer Genome Atlas (TCGA) dataset and further confirmed by HCC samples and cells lines. The roles of MEX3A in the proliferation, migration and sorafenib resistance were detected both in vitro and vivo. In addition, the underline mechanism was investigated. RESULTS In this study, MEX3A expression was upregulated in HCC tissue and cell lines. Knockdown or overexpression of MEX3A disturbed the proliferation, migration and apoptosis of HCC cells by modulating the activation of Hippo signaling pathway. The expression of MEX3A was negatively associated with sorafenib sensitivity and upregulated in sorafenib resistant HCC cells. MEX3A knockdown facilitated the expression of WWC1, a negative modulator of Hippo signaling pathway, and led to increase of the phosphorylation of LATS1 and YAP1. Pharmacological inhibition of LATS1 or WWC1 overexpression alleviated the proliferative and migrated suppression and increased sorafenib sensitivity, whereas WWC1 inhibition using genetic interference strategy showed opposite trend in MEX3A knockdown HCC cells. Importantly, MEX3A knockdown led to growth and lung metastasis inhibition using xenograft model established by means of subcutaneous or tail vein injection. In addition, a combination of MEX3A knockdown and WWC1 overexpression dramatically enhances the growth inhibition of sorafenib in vivo. CONCLUSION MEX3A may facilitate HCC progression and hinder sorafenib sensitivity via inactivating Hippo signaling. The present study suggested that targeting MEX3A can be served as a novel therapeutic strategy for HCC.
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Affiliation(s)
- Shiji Fang
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Liyun Zheng
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Xiaoxiao Chen
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Xiaoju Guo
- Shaoxing University School of Medicine, Shaoxing, 312099, China
| | - Yiming Ding
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
| | - Ji Ma
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
| | - Jiayi Ding
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
| | - Weiqian Chen
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Yang Yang
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Minjiang Chen
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Zhongwei Zhao
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Jianfei Tu
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China
| | - Jiansong Ji
- Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research, Institute of Imaging Diagnosis and Minimally Invasive Intervention Research, The Fifth Affiliated Hospital of Wenzhou Medical University, Lishui, 323000, China.
- Clinical College of The Affiliated Central Hospital, School of Medicine, Lishui University, Lishui, 323000, China.
- Department of Radiology, School of Medicine, Lishui Hospital of Zhejiang University, Lishui, 323000, China.
- Shaoxing University School of Medicine, Shaoxing, 312099, China.
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Hu J, Xiang Y, Zhu X, Hu C, Xu X, Li D, Deng Z, Jiang Z. Grass carp (Ctenopharyngodon idella) Mex3B positively regulates innate immunity by promoting the K63-linked ubiquitination of TLR3. FISH & SHELLFISH IMMUNOLOGY 2023; 141:109023. [PMID: 37625735 DOI: 10.1016/j.fsi.2023.109023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/20/2023] [Accepted: 08/21/2023] [Indexed: 08/27/2023]
Abstract
As a member of Mex3 (muscle excess protein-3) family, Mex3B (Mex-3 RNA binding family member B) is crucial in cell proliferation and migration in mammals. In this study, an ortholog of mammalian Mex3B (denominated CiMex3B, MT276802.1) was cloned and identified in grass carp (Ctenopharyngodon idella). CiMex3B is 1578 bp in length and encodes a polypeptide of 525 amino acids. Consistent with its mammalian counterpart, CiMex3B also contains one C-terminal RING domain and two N-terminal conserved tandem KH domains. CiMex3B up-regulates the expressions of IFN1, ISG15, MX2, as well as the expressions of inflammatory cytokines such as IL6, IL8 and TNFα in response to poly(I:C). A screening test for identifying potential targets indicated that CiMex3B is associated with TLR3 and TRIF. CiMex3B co-localizes with TLR3 in the late endosome, mitochondria and endoplasmic reticulum after poly(I:C) stimulation, whereas they are rarely discovered in the lysosomes. CiMex3B serves as a positive regulator in the phosphorylation of IRF3 and induces IFN1 expression. In addition, two truncation mutants of CiMex3B (1-220 and 221-525) were constructed to better understand the molecular mechanism of CiMex3B-mediated ubiquitination of TLR3. In line with wild-type protein, CiMex3B mutant (1-220) was found mainly in the cytoplasm; however, CiMex3B mutant (221-525) resided in the cytoplasm and the nucleus as well, and it was further confirmed that CiMex3B mutant (221-525) still interacts with TLR3. We also observed that CiMex3B promotes the K63-linked ubiquitination of TLR3, while neither of the truncation mutants (1-220 or 221-525) retains this activity. To sum up, this study revealed that CiMex3B potentiates the K63-linked ubiquitination of TLR3, and then elicits the IRF3-mediated antiviral innate immune responses.
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Affiliation(s)
- Jihuan Hu
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang, 330047, Jiangxi, China; Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China
| | - Yang Xiang
- Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China
| | - Xuechun Zhu
- Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China
| | - Chengyu Hu
- Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China
| | - Xiaowen Xu
- Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China
| | - Dongming Li
- Fuzhou Medical College, Nanchang University, Fuzhou, 344000, Jiangxi, China
| | - Zeyuan Deng
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang, 330047, Jiangxi, China
| | - Zeyin Jiang
- State Key Laboratory of Food Science and Resources, Nanchang University, Nanchang, 330047, Jiangxi, China; Department of Bioscience, College of Life Science, Nanchang University, Nanchang, 330031, Jiangxi, China.
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3
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Chen W, Hu L, Lu X, Wang X, Zhao C, Guo C, Li X, Ding Y, Zhao H, Tong D, Wang L, Huang C. The RNA binding protein MEX3A promotes tumor progression of breast cancer by post-transcriptional regulation of IGFBP4. Breast Cancer Res Treat 2023; 201:353-366. [PMID: 37433992 PMCID: PMC10460732 DOI: 10.1007/s10549-023-07028-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 06/27/2023] [Indexed: 07/13/2023]
Abstract
PURPOSE Breast cancer (BC) is the most frequent malignant tumor in women worldwide with exceptionally high morbidity. The RNA-binding protein MEX3A plays a crucial role in genesis and progression of multiple cancers. We attempted to explore its clinicopathological and functional significance in BC in which MEX3A is expressed. METHODS The expression of MEX3A detected by RT-qPCR and correlated the results with clinicopathological variables in 53 BC patients. MEX3A and IGFBP4 profile data of BC patients were downloaded from TCGA and GEO database. Kaplan-Meier (KM) analysis was used to estimate the survival rate of BC patients. Western Blot, CCK-8, EdU, colony formation and flow cytometry were performed to investigate the role of MEX3A and IGFBP4 in BC cell proliferation, invasion and cell cycle in vitro. A subcutaneous tumor mouse model was constructed to analyze in vivo growth of BC cells after MEX3A knockdown. The interactions among MEX3A and IGFBP4 were measured by RNA pull-down and RNA immunoprecipitation. RESULTS The expression of MEX3A was upregulated in BC tissues compared to adjacent tissues and high expression of MEX3A was associated with poor prognosis. Subsequent in vitro studies demonstrated that MEX3A knockdown inhibited BC cells proliferation and migration, as well as xenograft tumor growth in vivo. The expression of IGFBP4 was significantly negatively correlated with MEX3A in BC tissues. Mechanistic investigation showed that MEX3A binds to IGFBP4 mRNA in BC cells, decreasing IGFBP4 mRNA levels, which further activated the PI3K/AKT and other downstream signaling pathways implicated cell cycle progression and cell migration. CONCLUSION Our results indicate that MEX3A plays a prominent oncogenic role in BC tumorigenesis and progression by targeting IGFBP4 mRNA and activating PI3K/AKT signaling, which can be used as a novel therapeutic target for BC.
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Affiliation(s)
- Wenhu Chen
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, No. 76 Yanta West Road, Xi'an, 710061, Shanxi, China
- School of Basic Medical Sciences & Forensic Medicine, Hangzhou Medical College, Hangzhou, 310053, China
| | - Liqiang Hu
- Cancer Institute of Integrated Traditional Chinese and Western Medicine, Zhejiang Academy of Traditional Chinese Medicine, Hangzhou, 310012, China
| | - Xuemei Lu
- College of Pharmaceutical Sciences, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Xiaofei Wang
- Biomedical Experimental Center of Xi'an Jiaotong University, Xi'an, 710061, China
| | - Changan Zhao
- Department of Pathology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, 710061, China
| | - Chen Guo
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, No. 76 Yanta West Road, Xi'an, 710061, Shanxi, China
| | - Xiaoyan Li
- School of Basic Medical Sciences & Forensic Medicine, Hangzhou Medical College, Hangzhou, 310053, China
| | - Yuqin Ding
- Department of Breast Surgery, Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Hangzhou, 310005, China
| | - Hongguang Zhao
- Department of Thoracic Surgery, Cancer Hospital of the University of Chinese Academy of Sciences (Zhejiang Cancer Hospital), Hangzhou, 310005, China
| | - Dongdong Tong
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, No. 76 Yanta West Road, Xi'an, 710061, Shanxi, China
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center, Xi'an, 710061, China
| | - Lifang Wang
- College of Innovation & Entrepreneurship, Hangzhou Medical College, No. 548 Binwen Road, Hangzhou, 310053, Zhejiang, China.
| | - Chen Huang
- Department of Cell Biology and Genetics, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, No. 76 Yanta West Road, Xi'an, 710061, Shanxi, China.
- Key Laboratory of Environment and Genes Related to Diseases, Xi'an Jiaotong University Health Science Center, Xi'an, 710061, China.
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710061, China.
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4
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Liu JX, Chen AN, Yu Q, Shi KT, Liu YB, Guo CL, Wang ZZ, Yao Y, Pan L, Lu X, Xu K, Wang H, Zeng M, Liu C, Schleimer RP, Wu N, Liao B, Liu Z. MEX3B inhibits collagen production in eosinophilic nasal polyps by downregulating epithelial cell TGFBR3 mRNA stability. JCI Insight 2023; 8:e159058. [PMID: 36976645 PMCID: PMC10243817 DOI: 10.1172/jci.insight.159058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 03/22/2023] [Indexed: 03/29/2023] Open
Abstract
Although the expression of Mex3 RNA-binding family member B (MEX3B) is upregulated in human nasal epithelial cells (HNECs) predominately in the eosinophilic chronic rhinosinusitis (CRS) with nasal polyps (CRSwNP) subtype, its functions as an RNA binding protein in airway epithelial cells remain unknown. Here, we revealed the role of MEX3B based on different subtypes of CRS and demonstrated that MEX3B decreased the TGF-β receptor III (TGFBR3) mRNA level by binding to its 3' UTR and reducing its stability in HNECs. TGF-βR3 was found to be a TGF-β2-specific coreceptor in HNECs. Knocking down or overexpressing MEX3B promoted or inhibited TGF-β2-induced phosphorylation of SMAD2 in HNECs, respectively. TGF-βR3 and phosphorylated SMAD2 levels were downregulated in CRSwNP compared with controls and CRS without nasal polyps with a more prominent downregulation in the eosinophilic CRSwNP. TGF-β2 promoted collagen production in HNECs. Collagen abundance decreased and edema scores increased in CRSwNP compared with control, again more prominently in the eosinophilic type. Collagen expression in eosinophilic CRSwNP was negatively correlated with MEX3B but positively correlated with TGF-βR3. These results suggest that MEX3B inhibits tissue fibrosis in eosinophilic CRSwNP by downregulating epithelial cell TGFBR3 expression; consequently, MEX3B might be a valuable therapeutic target against eosinophilic CRSwNP.
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Affiliation(s)
- Jin-Xin Liu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Ao-Nan Chen
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Qihong Yu
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Clinical Medical Research Center of Hepatic Surgery at Hubei Province, Wuhan, China
| | - Ke-Tai Shi
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Yi-Bo Liu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Cui-Lian Guo
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Zhe-Zheng Wang
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Yin Yao
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Li Pan
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Xiang Lu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Kai Xu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Heng Wang
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Ming Zeng
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Chaohong Liu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
- Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Robert P. Schleimer
- Division of Allergy-Immunology, Department of Medicine; and
- Department of Otolaryngology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA
| | - Ning Wu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
- Department of Immunology, School of Basic Medicine, Tongji Medical College, and
- Cell Architecture Research Center, Huazhong University of Science and Technology, Wuhan, China
| | - Bo Liao
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
| | - Zheng Liu
- Department of Otolaryngology-Head and Neck Surgery, Tongji Hospital; and
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5
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Domingo-Muelas A, Duart-Abadia P, Morante-Redolat JM, Jordán-Pla A, Belenguer G, Fabra-Beser J, Paniagua-Herranz L, Pérez-Villalba A, Álvarez-Varela A, Barriga FM, Gil-Sanz C, Ortega F, Batlle E, Fariñas I. Post-transcriptional control of a stemness signature by RNA-binding protein MEX3A regulates murine adult neurogenesis. Nat Commun 2023; 14:373. [PMID: 36690670 PMCID: PMC9871011 DOI: 10.1038/s41467-023-36054-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 01/12/2023] [Indexed: 01/25/2023] Open
Abstract
Neural stem cells (NSCs) in the adult murine subependymal zone balance their self-renewal capacity and glial identity with the potential to generate neurons during the lifetime. Adult NSCs exhibit lineage priming via pro-neurogenic fate determinants. However, the protein levels of the neural fate determinants are not sufficient to drive direct differentiation of adult NSCs, which raises the question of how cells along the neurogenic lineage avoid different conflicting fate choices, such as self-renewal and differentiation. Here, we identify RNA-binding protein MEX3A as a post-transcriptional regulator of a set of stemness associated transcripts at critical transitions in the subependymal neurogenic lineage. MEX3A regulates a quiescence-related RNA signature in activated NSCs that is needed for their return to quiescence, playing a role in the long-term maintenance of the NSC pool. Furthermore, it is required for the repression of the same program at the onset of neuronal differentiation. Our data indicate that MEX3A is a pivotal regulator of adult murine neurogenesis acting as a translational remodeller.
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Grants
- EC | EU Framework Programme for Research and Innovation H2020 | H2020 Priority Excellent Science | H2020 European Research Council (H2020 Excellent Science - European Research Council)
- Ministerio de Ciencia e Innovación (MICINN, Spain) - PID2020-119917RB-I00.
- Regional Government of Valencia | Conselleria d'Educació, Investigació, Cultura i Esport (Conselleria d'Educació, Investigació, Cultura i Esport de la Generalitat Valenciana)
- Ministerio de Ciencia e Innovación (MICINN, Spain) - PID2020-117937GB-I00, PID2020-119917RB-I00, PID 2019-109155RB-I00, PID2020-114227RB-I00, RyC-2015-19058, PRE2018-084838. Centro de Investigación Biomédica en Red Enfermedades Neurodegenerativas (CIBERNED, Spain) - MICINN- CB06/05/0086.
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Affiliation(s)
- Ana Domingo-Muelas
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Pere Duart-Abadia
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Jose Manuel Morante-Redolat
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Antonio Jordán-Pla
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
| | - Germán Belenguer
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Jaime Fabra-Beser
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
| | - Lucía Paniagua-Herranz
- Departamento de Bioquímica y Biología Molecular, Universidad Complutense de Madrid (UCM), Madrid, Spain
- Instituto Universitario de Investigación en Neuroquímica (IUIN), Madrid, Spain
- Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain
| | - Ana Pérez-Villalba
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Adrián Álvarez-Varela
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona, Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Barcelona, Spain
| | - Francisco M Barriga
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona, Spain
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Barcelona, Spain
| | - Cristina Gil-Sanz
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain
| | - Felipe Ortega
- Departamento de Bioquímica y Biología Molecular, Universidad Complutense de Madrid (UCM), Madrid, Spain
- Instituto Universitario de Investigación en Neuroquímica (IUIN), Madrid, Spain
- Instituto de Investigación Sanitaria San Carlos (IdISSC), Madrid, Spain
| | - Eduard Batlle
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona, Spain.
- Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Barcelona, Spain.
- ICREA, Barcelona, Spain.
| | - Isabel Fariñas
- Departamento de Biología Celular, Biología Funcional y Antropología Física, Universidad de Valencia, Valencia, Spain.
- Instituto de Biotecnología y Biomedicina (BIOTECMED), Universidad de Valencia, Valencia, Spain.
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Valencia, Spain.
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Zhang M, Cao L, Hou G, Lv X, Deng J. Investigation of the Potential Correlation Between RNA-Binding Proteins in the Evolutionarily Conserved MEX3 Family and Non-small-Cell Lung Cancer. Mol Biotechnol 2022:10.1007/s12033-022-00638-2. [DOI: 10.1007/s12033-022-00638-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 12/05/2022] [Indexed: 12/14/2022]
Abstract
Abstract
Members of the MEX3 (muscle excess 3) family, uniquely characterised as mRNA binding proteins, play emerging roles in the post-transcriptional regulation of programmed biological processes, including tumour cell death and immune mechanisms, and have been shown to be involved in a variety of diseases. However, the role of MEX3 in non-small cell lung cancer (NSCLC) has not been fully elucidated. In this study, we found no significant changes in the sequence and copy number of the MEX3 gene through analysis using the COSMIC database, revealing its stability during malignancy development. Its expression in NSCLC was examined using the Oncomine™ database, and the prognosis of each member gene was analysed by Kaplan–Meier. The results showed that overexpression of MEX3A, MEX3B, MEX3C and MEX3D was associated with significantly worse OS in patients with LUAD, while overexpression of MEX3D was also associated with significantly worse OS in patients with LUSC. Afterwards, we applied the Tumour Immunology Estimation Resource (TIMER) tool to assess the correlation between different MEX3 and infiltrative immune cell infiltration. Ultimately, we found that most MEX3 members were highly expressed in NSCLC, with high expression suggesting poor prognosis and correlating with immune cell infiltration. The complexity and heterogeneity of NSCLC was understood through MEX3, setting the framework for the prognostic impact of MEX3 in NSCLC patients and the development of new targeted therapeutic strategies in the future.
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Gan T, Wang Y, Xie M, Wang Q, Zhao S, Wang P, Shi Q, Qian X, Miao F, Shen Z, Nie E. MEX3A Impairs DNA Mismatch Repair Signaling and Mediates Acquired Temozolomide Resistance in Glioblastoma. Cancer Res 2022; 82:4234-4246. [PMID: 36112059 DOI: 10.1158/0008-5472.can-22-2036] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/12/2022] [Accepted: 09/12/2022] [Indexed: 12/14/2022]
Abstract
MutS protein homolog 2 (MSH2) is a key element involved in the DNA mismatch repair (MMR) system, which is responsible for recognizing and repairing mispaired bases. Simultaneously, MSH2 identifies DNA adducts induced by temozolomide (TMZ) and triggers apoptosis and autophagy in tumor cells. Previous work has revealed that reduced MSH2 expression is often observed in patients with glioblastoma (GBM) who relapse after chemotherapy. Elucidation of the mechanism behind TMZ-mediated reduction of MSH2 could help improve GBM treatment. Here, we report significant upregulation of Mex-3 RNA binding family member A (MEX3A) in GBM tissues and cell lines following TMZ treatment. MEX3A bound to the MEX3 recognition element (MRE) of MSH2 mRNA, which in turn recruited CCR4-NOT complexes to target MSH2 mRNA for deadenylation and degradation. In addition, ectopic expression of MEX3A significantly decreased cellular DNA MMR activities and reduced the chemosensitivity of GBM cells via downregulation of MSH2, while depletion of MEX3A sensitized GBM cells to TMZ. In MGMT-deficient patients with GBM, MEX3A expression correlated with MSH2 levels, and high MEX3A expression was associated with poor prognosis. Overall, these findings reveal a potential mechanism by which MSH2 expression is reduced in post-TMZ recurrent GBM. SIGNIFICANCE A MEX3A/CCR4-NOT/MSH2 axis plays a crucial role in promoting temozolomide resistance, providing new insights into the function of MEX3A and suggesting MEX3A as a potential therapeutic target in therapy-resistant glioblastoma.
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Affiliation(s)
- Tian Gan
- Department of Endocrinology, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Yan Wang
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Manyi Xie
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Qiang Wang
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Saisai Zhao
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Peng Wang
- Department of Neurosurgery, Rizhao Central Hospital, Rizhao, Shandong Province, P.R. China
| | - Qinyu Shi
- Department of Neurosurgery, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu Province, P.R. China
| | - Xuanchen Qian
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Faan Miao
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Zhigang Shen
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
| | - Er Nie
- Department of Neurosurgery, The Affiliated Hospital of Xuzhou Medical University, Xuzhou, Jiangsu Province, P.R. China
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8
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Jiang Z, Sun Z, Hu J, Li D, Xu X, Li M, Feng Z, Zeng S, Mao H, Hu C. Grass Carp Mex3A Promotes Ubiquitination and Degradation of RIG-I to Inhibit Innate Immune Response. Front Immunol 2022; 13:909315. [PMID: 35865536 PMCID: PMC9295999 DOI: 10.3389/fimmu.2022.909315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 06/03/2022] [Indexed: 11/23/2022] Open
Abstract
As one of the Mex3 family members, Mex3A is crucial in cell proliferation, migration, and apoptosis in mammals. In this study, a novel gene homologous to mammalian Mex3A (named CiMex3A, MW368974) was cloned and identified in grass carp, which is 1,521 bp in length encoding a putative polypeptide of 506 amino acids. In CIK cells, CiMex3A is upregulated after stimulation with LPS, Z-DNA, and especially with intracellular poly(I:C). CiMex3A overexpression reduces the expressions of IFN1, ISG15, and pro-inflammatory factors IL8 and TNFα; likewise, Mex3A inhibits IRF3 phosphorylation upon treatment with poly(I:C). A screening test to identify potential targets suggested that CiMex3A interacts with RIG-I exclusively. Co-localization analysis showed that Mex3A and RIG-I are simultaneously located in the endoplasmic reticulum, while they rarely appear in the endosome, mitochondria, or lysosome after exposure to poly(I:C). However, RIG-I is mainly located in the early endosome and then transferred to the late endosome following stimulation with poly(I:C). Moreover, we investigated the molecular mechanism underlying CiMex3A-mediated suppression of RIG-I ubiquitination. The results demonstrated that Mex3A truncation mutant (deletion in the RING domain) can still interact physically with RIG-I, but fail to degrade it, suggesting that Mex3A also acts as a RING-type E3 ubiquitin ligase. Taken together, this study showed that grass carp Mex3A can interact with RIG-I in the endoplasmic reticulum following poly(I:C) stimulation, and then Mex3A facilitates the ubiquitination and degradation of RIG-I to inhibit IRF3-mediated innate antiviral immune response.
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Affiliation(s)
- Zeyin Jiang
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Zhichao Sun
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
- Human Aging Research Institute, Nanchang University, Nanchang, China
- Jiangxi Key Laboratory of Human Aging, Nanchang, China
| | - Jihuan Hu
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Dongming Li
- School of Basic Medical Sciences, Fuzhou Medical University, Fuzhou, China
| | - Xiaowen Xu
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Meifeng Li
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Zhiqing Feng
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Shanshan Zeng
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Huiling Mao
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
| | - Chengyu Hu
- School of Life Science, Key Laboratory of Aquatic Resources and Utilization of Jiangxi Province, Nanchang University, Nanchang, China
- *Correspondence: Chengyu Hu,
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9
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Li F, Zhao C, Diao Y, Wang Z, Peng J, Yang N, Qiu C, Kong B, Li Y. MEX3A promotes the malignant progression of ovarian cancer by regulating intron retention in TIMELESS. Cell Death Dis 2022; 13:553. [PMID: 35715407 PMCID: PMC9205863 DOI: 10.1038/s41419-022-05000-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 01/21/2023]
Abstract
The latest research shows that RNA-binding proteins (RBPs) could serve as novel potential targets for cancer therapy. We used bioinformatics analysis to screen and identify the key RBPs in ovarian cancer, from which we found that Mex-3 RNA Binding Family Member A (MEX3A) was intimately associated with the clinical prognosis of ovarian cancer. Nevertheless, little is known about its biological roles in ovarian cancer. In this case, we observed that MEX3A was highly overexpressed in fresh-frozen ovarian cancer tissues. MEX3A knockdown suppressed the development and invasion of ovarian cancer cells, while MEX3A overexpression promoted the proliferation and invasion of ovarian cancer cells. Mechanistically, TIMELESS was the critical downstream target gene of MEX3A, as demonstrated through alternative splicing event analysis based on RNA-seq. MEX3A knockdown resulted in retention of intron twenty-three of TIMELESS mRNA and decreased TIMELESS mRNA owing to stimulation of nonsense-mediated RNA decay (NMD). Additionally, we found that TIMELESS overexpression with MEX3A knockdown partially restored the proliferation ability of ovarian cancer cells. The results of this paper demonstrated that the MEX3A/TIMELESS signaling pathway was a key regulator of ovarian cancer, and MEX3A was a novel possible treatment target for ovarian cancer patients.
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Affiliation(s)
- Fangfang Li
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China ,grid.452240.50000 0004 8342 6962Department of Obstetrics and Gynaecology, Binzhou Medical University Hospital, Binzhou, 256600 Shangdong China
| | - Chen Zhao
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China
| | - Yuchao Diao
- grid.412521.10000 0004 1769 1119Department of Obstetrics and Gynaecology, The Affiliated Hospital of Qingdao University, Qingdao, 266000 Shangdong China
| | - Zixiang Wang
- grid.27255.370000 0004 1761 1174Medical Integration and Practice Center, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012 China
| | - Jiali Peng
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China
| | - Ning Yang
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China
| | - Chunping Qiu
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China
| | - Beihua Kong
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China
| | - Yingwei Li
- grid.452402.50000 0004 1808 3430Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, Shandong 250012 China ,grid.27255.370000 0004 1761 1174Medical Integration and Practice Center, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012 China
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10
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Chan CP, Jin DY. Cytoplasmic RNA sensors and their interplay with RNA-binding partners in innate antiviral response: theme and variations. RNA (NEW YORK, N.Y.) 2022; 28:449-477. [PMID: 35031583 PMCID: PMC8925969 DOI: 10.1261/rna.079016.121] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Sensing of pathogen-associated molecular patterns including viral RNA by innate immunity represents the first line of defense against viral infection. In addition to RIG-I-like receptors and NOD-like receptors, several other RNA sensors are known to mediate innate antiviral response in the cytoplasm. Double-stranded RNA-binding protein PACT interacts with prototypic RNA sensor RIG-I to facilitate its recognition of viral RNA and induction of host interferon response, but variations of this theme are seen when the functions of RNA sensors are modulated by other RNA-binding proteins to impinge on antiviral defense, proinflammatory cytokine production and cell death programs. Their discrete and coordinated actions are crucial to protect the host from infection. In this review, we will focus on cytoplasmic RNA sensors with an emphasis on their interplay with RNA-binding partners. Classical sensors such as RIG-I will be briefly reviewed. More attention will be brought to new insights on how RNA-binding partners of RNA sensors modulate innate RNA sensing and how viruses perturb the functions of RNA-binding partners.
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Affiliation(s)
- Chi-Ping Chan
- School of Biomedical Sciences and State Key Laboratory of Liver Research, Faculty of Medicine Building, Pokfulam, Hong Kong
| | - Dong-Yan Jin
- School of Biomedical Sciences and State Key Laboratory of Liver Research, Faculty of Medicine Building, Pokfulam, Hong Kong
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11
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Chu J, Li T, Li L, Fan H. MicroRNA-139-5p Suppresses Cell Malignant Behaviors in Breast Cancer through Targeting MEX3A. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2021; 2021:6591541. [PMID: 34765013 PMCID: PMC8577887 DOI: 10.1155/2021/6591541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/09/2021] [Accepted: 10/12/2021] [Indexed: 12/24/2022]
Abstract
OBJECTIVE The study was designed to evaluate the underlying mechanism of microRNA-139-5p in breast cancer (BC). METHODS Expression statuses of microRNA-139-5p and MEX3A were measured by qRT-PCR and western blotting. The anticancer effect of microRNA-139-5p in vitro was tested by a set of assays. Interaction between microRNA-139-5p and MEX3A was validated by dual-luciferase detection. RESULTS MicroRNA-139-5p expression in BC cells was obviously low, while MEX3A was significantly overexpressed. MicroRNA-139-5p restrained proliferative, invasive, and migratory abilities of BC cells and increased apoptosis level of BC cells, while MEX3A exerted a promoting effect on BC cell growth. Dual-luciferase reporter detection confirmed that microRNA-139-5p bound to MEX3A 3'-UTR. CONCLUSIONS MicroRNA-139-5p inhibited the development of BC by targeting MEX3A. MicroRNA-139-5p/MEX3A may be a target for BC therapy.
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Affiliation(s)
- Jian Chu
- Department of General Surgery, The First People's Hospital of Yancheng, Yancheng, 224005 Jiangsu Province, China
- Yancheng First Hospital, Affiliated Hospital of Nanjing University Medical School, China
| | - Tangya Li
- Department of General Surgery, The First People's Hospital of Yancheng, Yancheng, 224005 Jiangsu Province, China
- Yancheng First Hospital, Affiliated Hospital of Nanjing University Medical School, China
| | - Lei Li
- Department of General Surgery, The First People's Hospital of Yancheng, Yancheng, 224005 Jiangsu Province, China
- Yancheng First Hospital, Affiliated Hospital of Nanjing University Medical School, China
| | - Huiwen Fan
- Department of General Surgery, The First People's Hospital of Yancheng, Yancheng, 224005 Jiangsu Province, China
- Yancheng First Hospital, Affiliated Hospital of Nanjing University Medical School, China
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12
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Albarqi MMY, Ryder SP. The endogenous mex-3 3´UTR is required for germline repression and contributes to optimal fecundity in C. elegans. PLoS Genet 2021; 17:e1009775. [PMID: 34424904 PMCID: PMC8412283 DOI: 10.1371/journal.pgen.1009775] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 09/02/2021] [Accepted: 08/11/2021] [Indexed: 11/18/2022] Open
Abstract
RNA regulation is essential to successful reproduction. Messenger RNAs delivered from parent to progeny govern early embryonic development. RNA-binding proteins (RBPs) are the key effectors of this process, regulating the translation and stability of parental transcripts to control cell fate specification events prior to zygotic gene activation. The KH-domain RBP MEX-3 is conserved from nematode to human. It was first discovered in Caenorhabditis elegans, where it is essential for anterior cell fate and embryo viability. Here, we show that loss of the endogenous mex-3 3´UTR disrupts its germline expression pattern. An allelic series of 3´UTR deletion variants identify repressing regions of the UTR and demonstrate that repression is not precisely coupled to reproductive success. We also show that several RBPs regulate mex-3 mRNA through its 3´UTR to define its unique germline spatiotemporal expression pattern. Additionally, we find that both poly(A) tail length control and the translation initiation factor IFE-3 contribute to its expression pattern. Together, our results establish the importance of the mex-3 3´UTR to reproductive health and its expression in the germline. Our results suggest that additional mechanisms control MEX-3 function when 3´UTR regulation is compromised. In sexually reproducing organisms, germ cells undergo meiosis and differentiate to form oocytes or sperm. Coordination of this process requires a gene regulatory program that acts while the genome is undergoing chromatin condensation. As such, RNA regulatory pathways are an important contributor. The germline of the nematode Caenorhabditis elegans is a suitable model system to study germ cell differentiation. Several RNA-binding proteins (RBPs) coordinate each transition in the germline such as the transition from mitosis to meiosis. MEX-3 is a conserved RNA-binding protein found in most animals including humans. In C. elegans, MEX-3 displays a highly restricted pattern of expression. Here, we define the importance of the 3´UTR in regulating MEX-3 expression pattern in vivo and characterize the RNA-binding proteins involved in this regulation. Our results show that deleting various mex-3 3´UTR regions alter the pattern of expression in the germline in various ways. These mutations also reduced—but did not eliminate—reproductive capacity. Finally, we demonstrate that multiple post-transcriptional mechanisms control MEX-3 levels in different domains of the germline. Our data suggest that coordination of MEX-3 activity requires multiple layers of regulation to ensure reproductive robustness.
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Affiliation(s)
- Mennatallah M. Y. Albarqi
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
| | - Sean P. Ryder
- Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, United States of America
- * E-mail:
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13
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Santovito D, Egea V, Bidzhekov K, Natarelli L, Mourão A, Blanchet X, Wichapong K, Aslani M, Brunßen C, Horckmans M, Hristov M, Geerlof A, Lutgens E, Daemen MJAP, Hackeng T, Ries C, Chavakis T, Morawietz H, Naumann R, von Hundelshausen P, Steffens S, Duchêne J, Megens RTA, Sattler M, Weber C. Noncanonical inhibition of caspase-3 by a nuclear microRNA confers endothelial protection by autophagy in atherosclerosis. Sci Transl Med 2021; 12:12/546/eaaz2294. [PMID: 32493793 DOI: 10.1126/scitranslmed.aaz2294] [Citation(s) in RCA: 85] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Accepted: 04/02/2020] [Indexed: 12/11/2022]
Abstract
MicroRNAs (miRNAs) are versatile regulators of gene expression with profound implications for human disease including atherosclerosis, but whether they can exert posttranslational functions to control cell adaptation and whether such noncanonical features harbor pathophysiological relevance is unknown. Here, we show that miR-126-5p sustains endothelial integrity in the context of high shear stress and autophagy. Bound to argonaute-2 (Ago2), miR-126-5p forms a complex with Mex3a, which occurs on the surface of autophagic vesicles and guides its transport into the nucleus. Mutational studies and biophysical measurements demonstrate that Mex3a binds to the central U- and G-rich regions of miR-126-5p with nanomolar affinity via its two K homology domains. In the nucleus, miR-126-5p dissociates from Ago2 and binds to caspase-3 in an aptamer-like fashion with its seed sequence, preventing dimerization of the caspase and inhibiting its activity to limit apoptosis. The antiapoptotic effect of miR-126-5p outside of the RNA-induced silencing complex is important for endothelial integrity under conditions of high shear stress promoting autophagy: ablation of Mex3a or ATG5 in vivo attenuates nuclear import of miR-126-5p, aggravates endothelial apoptosis, and exacerbates atherosclerosis. In human plaques, we found reduced nuclear miR-126-5p and active caspase-3 in areas of disturbed flow. The direct inhibition of caspase-3 by nuclear miR-126-5p reveals a noncanonical mechanism by which miRNAs can modulate protein function.
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Affiliation(s)
- Donato Santovito
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany. .,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany
| | - Virginia Egea
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Kiril Bidzhekov
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Lucia Natarelli
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany
| | - André Mourão
- Institute of Structural Biolology, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
| | - Xavier Blanchet
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Kanin Wichapong
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6229HX Maastricht, Netherlands
| | - Maria Aslani
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany
| | - Coy Brunßen
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, Faculty of Medicine, TU Dresden, D-01307 Dresden, Germany
| | - Michael Horckmans
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire, Université Libre de Bruxelles (ULB), B-1070 Brussels, Belgium
| | - Michael Hristov
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Arie Geerlof
- Institute of Structural Biolology, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
| | - Esther Lutgens
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany.,Department of Medical Biochemistry and Pathology, Amsterdam University Medical Centers, Amsterdam School of Cardiovascular Sciences (ACS), 1081HZ Amsterdam, Netherlands
| | - Mat J A P Daemen
- Department of Medical Biochemistry and Pathology, Amsterdam University Medical Centers, Amsterdam School of Cardiovascular Sciences (ACS), 1081HZ Amsterdam, Netherlands
| | - Tilman Hackeng
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6229HX Maastricht, Netherlands
| | - Christian Ries
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Triantafyllos Chavakis
- Institute of Clinical Chemistry and Laboratory Medicine, Faculty of Medicine, TU Dresden, D-01307 Dresden, Germany
| | - Henning Morawietz
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, Faculty of Medicine, TU Dresden, D-01307 Dresden, Germany
| | - Ronald Naumann
- Max-Planck-Institute of Molecular Cell Biology and Genetics, D-01307 Dresden, Germany
| | - Philipp von Hundelshausen
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany
| | - Sabine Steffens
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany
| | - Johan Duchêne
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany
| | - Remco T A Megens
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany.,Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6229HX Maastricht, Netherlands
| | - Michael Sattler
- Institute of Structural Biolology, Helmholtz Zentrum München, D-85764 Neuherberg, Germany.,Center for Integrated Protein Science Munich at Biomolecular NMR Spectroscopy, Department of Chemistry, Technical University of Munich, D-85747 Garching, Germany
| | - Christian Weber
- Institute for Cardiovascular Prevention (IPEK), Ludwig-Maximillians-Universität (LMU) München, D-80336 Munich, Germany. .,German Center for Cardiovascular Research (DZHK), partner site Munich Heart Alliance, D-80336 Munich, Germany.,Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6229HX Maastricht, Netherlands.,Munich Cluster for Systems Neurology (SyNergy), D-81377 Munich, Germany
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14
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Comprehensive Analysis of Prognostic Value of MEX3A and Its Relationship with Immune Infiltrates in Ovarian Cancer. J Immunol Res 2021; 2021:5574176. [PMID: 34189143 PMCID: PMC8195639 DOI: 10.1155/2021/5574176] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 05/03/2021] [Accepted: 05/20/2021] [Indexed: 12/18/2022] Open
Abstract
MEX3A is a critical RNA-binding ubiquitin ligase that is upregulated in various types of cancer. However, the correlations of MEX3A with prognosis and its molecular mechanism in ovarian cancer (OC) remain unclear. The expression level, prognostic values, and the genetic variations of MEX3A were analyzed via Gene Expression Profiling Interactive Analysis (GEPIA) Oncomine, Kaplan-Meier plotter, and cBioPortal. We used the LinkedOmics database to investigate the functions of MEX3A coexpressed genes and performed visualizing gene interaction network analysis on the GeneMANIA website. The correlations between MEX3A and cancer immune infiltration were analyzed by the Tumor Immune Estimation Resource (TIMER) site and the TISIDB database. Furthermore, in vitro analysis was performed to evaluate the biological functions of MEX3A in OC cells. Our study showed that the expression of the MEX3A in OC was higher than in normal tissues; it had the greatest prognostic value in OC, and strong physical interaction with PABPC1, LAMTOR2, KHDRBS2, and IGF2BP2, which indicated the association between MEX3A and immune infiltration. We also found that MEX3A was negatively related to infiltrating levels of several types of immune cells, including macrophages, neutrophils, dendritic cells (DCs), B cells, and CD8+ T cells. Additionally, in vitro experiments demonstrated that MEX3A promotes proliferation and migration in OC cells. Taken together, MEX3A might influence the biological functions of OC cells by regulating the immune infiltration in the microenvironment as a prognostic biomarker and a potential therapeutic target.
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15
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Lederer M, Müller S, Glaß M, Bley N, Ihling C, Sinz A, Hüttelmaier S. Oncogenic Potential of the Dual-Function Protein MEX3A. BIOLOGY 2021; 10:415. [PMID: 34067172 PMCID: PMC8151450 DOI: 10.3390/biology10050415] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 04/26/2021] [Accepted: 05/05/2021] [Indexed: 12/23/2022]
Abstract
MEX3A belongs to the MEX3 (Muscle EXcess) protein family consisting of four members (MEX3A-D) in humans. Characteristic for MEX3 proteins is their domain structure with 2 HNRNPK homology (KH) domains mediating RNA binding and a C-terminal really interesting new gene (RING) domain that harbors E3 ligase function. In agreement with their domain composition, MEX3 proteins were reported to modulate both RNA fate and protein ubiquitination. MEX3 paralogs exhibit an oncofetal expression pattern, they are severely downregulated postnatally, and re-expression is observed in various malignancies. Enforced expression of MEX3 proteins in various cancers correlates with poor prognosis, emphasizing their oncogenic potential. The latter is supported by MEX3A's impact on proliferation, self-renewal as well as migration of tumor cells in vitro and tumor growth in xenograft studies.
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Affiliation(s)
- Marcell Lederer
- Charles Tanford Protein Center, Faculty of Medicine, Institute of Molecular Medicine, Section for Molecular Cell Biology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle, Germany; (S.M.).; (M.G.).; (N.B.); (S.H.)
| | - Simon Müller
- Charles Tanford Protein Center, Faculty of Medicine, Institute of Molecular Medicine, Section for Molecular Cell Biology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle, Germany; (S.M.).; (M.G.).; (N.B.); (S.H.)
| | - Markus Glaß
- Charles Tanford Protein Center, Faculty of Medicine, Institute of Molecular Medicine, Section for Molecular Cell Biology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle, Germany; (S.M.).; (M.G.).; (N.B.); (S.H.)
| | - Nadine Bley
- Charles Tanford Protein Center, Faculty of Medicine, Institute of Molecular Medicine, Section for Molecular Cell Biology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle, Germany; (S.M.).; (M.G.).; (N.B.); (S.H.)
| | - Christian Ihling
- Center for Structural Mass Spectrometry, Department of Pharmaceutical Chemistry & Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06120 Halle (Saale), Germany; (C.I.); (A.S.)
| | - Andrea Sinz
- Center for Structural Mass Spectrometry, Department of Pharmaceutical Chemistry & Bioanalytics, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3, 06120 Halle (Saale), Germany; (C.I.); (A.S.)
| | - Stefan Hüttelmaier
- Charles Tanford Protein Center, Faculty of Medicine, Institute of Molecular Medicine, Section for Molecular Cell Biology, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 3a, 06120 Halle, Germany; (S.M.).; (M.G.).; (N.B.); (S.H.)
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The effects of MEX3A knockdown on proliferation, apoptosis and migration of osteosarcoma cells. Cancer Cell Int 2021; 21:197. [PMID: 33827584 PMCID: PMC8028067 DOI: 10.1186/s12935-021-01882-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 03/16/2021] [Indexed: 12/21/2022] Open
Abstract
Background Osteosarcoma is an aggressive malignant tumor which has attracted worldwide attention. MEX3A may be associated with tumors while has not yet seen its coverage on osteosarcoma. Herein, this study was to investigate the correlation between MEX3A and the progression of osteosarcoma. Methods Firstly, we determined that expression of MEX3A was significantly higher in osteosarcoma tissues than that in marginal bone by immunohistochemical staining. Additionally, MEX3A expression was downregulated by the RNAi‐mediated knockdown. The functions of MEX3A knockdown on proliferation, apoptosis, cell cycle, migration was assessed by MTT assay, flow cytometry, wound-healing assay and Transwell assay, respectively. Knockdown of MEX3A resulted in suppressing cell proliferation, increasing cell apoptosis, inducing the G2 phase cell cycle arrest, and attenuating cellular migration. Furthermore, mouse xenograft model confirmed inhibitory effects of MEX3A knockdown on osteosarcoma formation. Results The preliminary exploration on the molecular mechanism of MEX3A in osteosarcoma cells showed that the induction of apoptosis needs the participation of a series of apoptosis- associated factors, such as upregulation of Caspase 3, Caspase 8 and HSP60, downregulation of HSP27 and XIAP. Conclusions In summary, these findings predicated that therapy directed at decreasing MEX3A expression is a potential osteosarcoma treatment. Supplementary Information The online version contains supplementary material available at 10.1186/s12935-021-01882-3.
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Liu YF, Sun XY, Zhang JK, Wang ZH, Ren ZG, Li J, Guo WZ, Zhang SJ. hMex-3A is associated with poor prognosis and contributes to the progression of hepatocellular carcinoma. Hepatobiliary Pancreat Dis Int 2021; 20:147-153. [PMID: 32291179 DOI: 10.1016/j.hbpd.2020.03.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 03/10/2020] [Indexed: 02/05/2023]
Abstract
BACKGROUND HMex-3A, an RNA-binding protein, was found to be associated with tumorigenesis. However, the roles of hMex-3A in hepatocellular carcinoma (HCC) progression remained unclear. METHODS The different expression of hMex-3A between HCC tissues and non-tumor tissues was evaluated using The Cancer Genome Atlas database. Thereafter, the hMex-3A expression was evaluated in HCC tissues using Western blotting and qRT-PCR. Immunohistochemistry was performed to investigate the association between hMex-3A level and clinicopathological features including prognosis in HCC patients. In addition, we used si-hMex-3A to knockdown hMex-3A in HCC cells to test Cell Counting Kit-8, colony formation, cell migration and invasion. RESULTS The hMex-3A expression was significantly elevated in HCC tissues. Analysis of the clinicopathological parameters suggested that hMex-3A expression was significantly associated with pathological grade (P = 0.019) and TNM stage (P = 0.001) in HCC. Moreover, univariate and multivariate Cox-regression analyses revealed that high hMex-3A expression (HR = 1.491, 95% CI: 1.107-2.007; P = 0.009) was an independent risk factor for overall survival in HCC patients. Finally, we confirmed that si-hMex-3A could significantly inhibit HCC cell proliferation, migration, and invasion in vitro. CONCLUSIONS HMex-3A may contribute to the progression of HCC and might be used as a novel therapeutic target and prognostic marker in HCC.
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Affiliation(s)
- Yi-Fan Liu
- Zhengzhou Key Laboratory of Hepatobiliary and Pancreatic Diseases and Organ Transplantation, Zhengzhou 450052, China; Henan Key Laboratory of Digestive Organ Transplantation, Zhengzhou 450052, China
| | - Xiao-Yan Sun
- Zhengzhou Key Laboratory of Hepatobiliary and Pancreatic Diseases and Organ Transplantation, Zhengzhou 450052, China; Henan Key Laboratory of Digestive Organ Transplantation, Zhengzhou 450052, China
| | - Jia-Kai Zhang
- Department of Hepatobiliary and Pancreatic Surgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Open and Key Laboratory of Hepatobiliary and Pancreatic Surgery and Digestive Organ Transplantation at Henan Universities, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Zhi-Hui Wang
- Department of Hepatobiliary and Pancreatic Surgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Open and Key Laboratory of Hepatobiliary and Pancreatic Surgery and Digestive Organ Transplantation at Henan Universities, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Zhi-Gang Ren
- Department of Infectious Diseases, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Jie Li
- Zhengzhou Key Laboratory of Hepatobiliary and Pancreatic Diseases and Organ Transplantation, Zhengzhou 450052, China; Henan Key Laboratory of Digestive Organ Transplantation, Zhengzhou 450052, China
| | - Wen-Zhi Guo
- Zhengzhou Key Laboratory of Hepatobiliary and Pancreatic Diseases and Organ Transplantation, Zhengzhou 450052, China; Henan Key Laboratory of Digestive Organ Transplantation, Zhengzhou 450052, China; Department of Hepatobiliary and Pancreatic Surgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Open and Key Laboratory of Hepatobiliary and Pancreatic Surgery and Digestive Organ Transplantation at Henan Universities, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Shui-Jun Zhang
- Zhengzhou Key Laboratory of Hepatobiliary and Pancreatic Diseases and Organ Transplantation, Zhengzhou 450052, China; Henan Key Laboratory of Digestive Organ Transplantation, Zhengzhou 450052, China; Department of Hepatobiliary and Pancreatic Surgery, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China; Open and Key Laboratory of Hepatobiliary and Pancreatic Surgery and Digestive Organ Transplantation at Henan Universities, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China.
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18
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Yang C, Zhan H, Zhao Y, Wu Y, Li L, Wang H. MEX3A contributes to development and progression of glioma through regulating cell proliferation and cell migration and targeting CCL2. Cell Death Dis 2021; 12:14. [PMID: 33414423 PMCID: PMC7791131 DOI: 10.1038/s41419-020-03307-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 11/03/2020] [Accepted: 11/05/2020] [Indexed: 01/03/2023]
Abstract
Glioma is one of the most commonly diagnosed intracranial malignant tumors with extremely high morbidity and mortality, whose treatment was seriously limited because of the unclear molecular mechanism. In this study, in order to identify a novel therapeutic target for glioma treatment, we explored the functions and mechanism of MEX3A in regulating glioma. The immunohistochemical staining of MEX3A in glioma and normal tissues revealed the upregulation of MEX3A and further indicated the relationship between high MEX3A expression and higher malignancy as well as poorer prognosis of glioma. In vitro loss-of-function and gain-of-function experiments comprehensively demonstrated that MEX3A may promote glioma development through regulating cell proliferation, cell apoptosis, cell cycle, and cell migration. In vivo experiments also suggested the inhibition of glioma growth by MEX3A knockdown. Moreover, our mechanistic study identifies CCL2 as a potential downstream target of MEX3A, which possesses similar regulatory effects on glioma development with MEX3A and could attenuate the promotion of glioma induced by MEX3A overexpression. Overall, MEX3A was identified as a potential tumor promoter in glioma development and therapeutic target in glioma treatment.
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Affiliation(s)
- Chao Yang
- Department of Neurosurgery, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China
| | - Haoqiang Zhan
- Department of Neurosurgery, The Six Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China
| | - Yiqing Zhao
- Department of Neurosurgery, TongJi hospital of TongJi Medical College, Huazhong University of Science and Technology, Hankou, Wuhan, 430030, China
| | - Yasong Wu
- Department of Neurosurgery, TongJi hospital of TongJi Medical College, Huazhong University of Science and Technology, Hankou, Wuhan, 430030, China
| | - Lisha Li
- The Key Laboratory of Pathobiology, Ministry of Education, College of Basic Medical Sciences, Jilin University, Changchun, 130012, China
| | - Heping Wang
- Department of Neurosurgery, TongJi hospital of TongJi Medical College, Huazhong University of Science and Technology, Hankou, Wuhan, 430030, China.
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19
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MEX3A promotes triple negative breast cancer proliferation and migration via the PI3K/AKT signaling pathway. Exp Cell Res 2020; 395:112191. [DOI: 10.1016/j.yexcr.2020.112191] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 07/11/2020] [Accepted: 07/21/2020] [Indexed: 12/16/2022]
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20
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Pereira B, Amaral AL, Dias A, Mendes N, Muncan V, Silva AR, Thibert C, Radu AG, David L, Máximo V, van den Brink GR, Billaud M, Almeida R. MEX3A regulates Lgr5 + stem cell maintenance in the developing intestinal epithelium. EMBO Rep 2020; 21:e48938. [PMID: 32052574 PMCID: PMC7132344 DOI: 10.15252/embr.201948938] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 01/15/2020] [Accepted: 01/20/2020] [Indexed: 12/12/2022] Open
Abstract
Intestinal stem cells (ISCs) fuel the lifelong self‐renewal of the intestinal tract and are paramount for epithelial repair. In this context, the Wnt pathway component LGR5 is the most consensual ISC marker to date. Still, the effort to better understand ISC identity and regulation remains a challenge. We have generated a Mex3a knockout mouse model and show that this RNA‐binding protein is crucial for the maintenance of the Lgr5+ISC pool, as its absence disrupts epithelial turnover during postnatal development and stereotypical organoid maturation ex vivo. Transcriptomic profiling of intestinal crypts reveals that Mex3a deletion induces the peroxisome proliferator‐activated receptor (PPAR) pathway, along with a decrease in Wnt signalling and loss of the Lgr5+ stem cell signature. Furthermore, we identify PPARγ activity as a molecular intermediate of MEX3A‐mediated regulation. We also show that high PPARγ signalling impairs Lgr5+ISC function, thus uncovering a new layer of post‐transcriptional regulation that critically contributes to intestinal homeostasis.
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Affiliation(s)
- Bruno Pereira
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Ana L Amaral
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Alexandre Dias
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Nuno Mendes
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Vanesa Muncan
- Department of Gastroenterology and Hepatology, Amsterdam UMC, Tytgat Institute, University of Amsterdam, Amsterdam, The Netherlands
| | - Ana R Silva
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Chantal Thibert
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, University Grenoble Alpes, Grenoble, France
| | - Anca G Radu
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, University Grenoble Alpes, Grenoble, France
| | - Leonor David
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal
| | - Valdemar Máximo
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal
| | - Gijs R van den Brink
- Department of Gastroenterology and Hepatology, Amsterdam UMC, Tytgat Institute, University of Amsterdam, Amsterdam, The Netherlands.,Medicines Research Center, GSK, Stevenage, UK
| | - Marc Billaud
- Clinical and Experimental Model of Lymphomagenesis, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Université Claude Bernard Lyon 1, Centre de Recherche en Cancérologie de Lyon, Lyon, France
| | - Raquel Almeida
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal.,Biology Department, Faculty of Sciences, University of Porto, Porto, Portugal
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Bufalieri F, Caimano M, Lospinoso Severini L, Basili I, Paglia F, Sampirisi L, Loricchio E, Petroni M, Canettieri G, Santoro A, D’Angelo L, Infante P, Di Marcotullio L. The RNA-Binding Ubiquitin Ligase MEX3A Affects Glioblastoma Tumorigenesis by Inducing Ubiquitylation and Degradation of RIG-I. Cancers (Basel) 2020; 12:cancers12020321. [PMID: 32019099 PMCID: PMC7072305 DOI: 10.3390/cancers12020321] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 01/24/2020] [Accepted: 01/28/2020] [Indexed: 12/14/2022] Open
Abstract
Glioblastoma multiforme (GB) is the most malignant primary brain tumor in humans, with an overall survival of approximatively 15 months. The molecular heterogeneity of GB, as well as its rapid progression, invasiveness and the occurrence of drug-resistant cancer stem cells, limits the efficacy of the current treatments. In order to develop an innovative therapeutic strategy, it is mandatory to identify and characterize new molecular players responsible for the GB malignant phenotype. In this study, the RNA-binding ubiquitin ligase MEX3A was selected from a gene expression analysis performed on publicly available datasets, to assess its biological and still-unknown activity in GB tumorigenesis. We find that MEX3A is strongly up-regulated in GB specimens, and this correlates with very low protein levels of RIG-I, a tumor suppressor involved in differentiation, apoptosis and innate immune response. We demonstrate that MEX3A binds RIG-I and induces its ubiquitylation and proteasome-dependent degradation. Further, the genetic depletion of MEX3A leads to an increase of RIG-I protein levels and results in the suppression of GB cell growth. Our findings unveil a novel molecular mechanism involved in GB tumorigenesis and suggest MEX3A and RIG-I as promising therapeutic targets in GB.
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Affiliation(s)
- Francesca Bufalieri
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
| | - Miriam Caimano
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
| | - Ludovica Lospinoso Severini
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
| | - Irene Basili
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
| | - Francesco Paglia
- Dipartimento di Neurologia e Psichiatria, Neurochirurgia, Sapienza University, Viale dell’Università 30, 00185 Rome, Italy; (F.P.); (L.S.); (A.S.); (L.D.)
| | - Luigi Sampirisi
- Dipartimento di Neurologia e Psichiatria, Neurochirurgia, Sapienza University, Viale dell’Università 30, 00185 Rome, Italy; (F.P.); (L.S.); (A.S.); (L.D.)
| | - Elena Loricchio
- Center for Life Nano Science (CLNS@Sapienza), Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161 Rome, Italy
| | - Marialaura Petroni
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
| | - Gianluca Canettieri
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
- Laboratory Affiliated to Istituto Pasteur Italia-Fondazione Cenci Bolognetti-Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy
| | - Antonio Santoro
- Dipartimento di Neurologia e Psichiatria, Neurochirurgia, Sapienza University, Viale dell’Università 30, 00185 Rome, Italy; (F.P.); (L.S.); (A.S.); (L.D.)
| | - Luca D’Angelo
- Dipartimento di Neurologia e Psichiatria, Neurochirurgia, Sapienza University, Viale dell’Università 30, 00185 Rome, Italy; (F.P.); (L.S.); (A.S.); (L.D.)
| | - Paola Infante
- Center for Life Nano Science (CLNS@Sapienza), Istituto Italiano di Tecnologia, Viale Regina Elena 291, 00161 Rome, Italy
- Correspondence: (P.I.); (L.D.M.); Tel.: +39-06-49255132 (P.I.); +39-06-49255657 (L.D.M.); Fax: +39-06-49255660 (L.D.M.)
| | - Lucia Di Marcotullio
- Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy; (F.B.); (M.C.); (L.L.S.); (I.B.); (M.P.); (G.C.)
- Laboratory Affiliated to Istituto Pasteur Italia-Fondazione Cenci Bolognetti-Department of Molecular Medicine, Sapienza University, Viale Regina Elena 291, 00161 Rome, Italy
- Correspondence: (P.I.); (L.D.M.); Tel.: +39-06-49255132 (P.I.); +39-06-49255657 (L.D.M.); Fax: +39-06-49255660 (L.D.M.)
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Yang D, Jiao Y, Li Y, Fang X. Clinical characteristics and prognostic value of MEX3A mRNA in liver cancer. PeerJ 2020; 8:e8252. [PMID: 31998552 PMCID: PMC6979405 DOI: 10.7717/peerj.8252] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 11/20/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND MEX3A is an RNA-binding proteins (RBPs) that promotes the proliferation, invasion, migration and viability of cancer cells. The aim of this study was to explore the clinicopathological characteristics and prognostic significance of MEX3A mRNA expression in liver cancer. METHODS RNA-Seq and clinical data were collected from The Cancer Genome Atlas (TCGA). Boxplots were used to represent discrete variables of MEX3A. Chi-square tests were used to analyze the correlation between clinical features and MEX3A expression. Receiver operating characteristic (ROC) curves were used to confirm diagnostic ability. Independent prognostic ability and values were assessed using Kaplan-Meier curves and Cox analysis. RESULTS We acquired MEX3A RNA-Seq from 50 normal liver tissues and 373 liver cancer patients along with clinical data. We found that MEX3A was up-regulated in liver cancer which increased according to histological grade (p < 0.001). MEX3A showed moderate diagnostic ability for liver cancer (AUC = 0.837). Kaplan-Meier curves and Cox analysis revealed that the high expression of MEX3A was significantly associated with poor survival (OS and RFS) (p < 0.001). Moreover, MEX3A was identified as an independent prognostic factor of liver cancer (p < 0.001). CONCLUSIONS MEX3A expression shows promise as an independent predictor of liver cancer prognosis.
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Affiliation(s)
- Dingquan Yang
- Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
| | - Yan Jiao
- Department of Hepatobiliary and Pancreatic Surgery, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Yanqing Li
- Department of Pathophysiology, College of Basic Medical Sciences, Jilin University, Changchun, Jilin, China
| | - Xuedong Fang
- Department of Gastrointestinal Colorectal and Anal Surgery, China-Japan Union Hospital of Jilin University, Changchun, Jilin, China
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Moududee SA, Jiang Y, Gilbert N, Xie G, Xu Z, Wu J, Gong Q, Tang Y, Shi Y. Structural and functional characterization of hMEX-3C Ring finger domain as an E3 ubiquitin ligase. Protein Sci 2018; 27:1661-1669. [PMID: 30095198 PMCID: PMC6194269 DOI: 10.1002/pro.3473] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 06/16/2018] [Accepted: 06/18/2018] [Indexed: 01/07/2023]
Abstract
MEX-3C, a novel RNA binding E3 ubiquitin ligases, contains two N-terminal heterogeneous nuclear ribonucleoprotein K homology (KH) domains and C-terminal Ring finger domain. Recent evidence has suggested that human MEX-3C has a strong bondage with carcinogenesis and the MEX-3C-mediated ubiquitination of RIG-I is essential for the antiviral innate immune response. Moreover, the Ring finger domain of MEX-3C could regulate the degradation of HLA-A2 (an MHC-I allotype) mRNA with a novel mechanism. However, the structural basis for the ubiquitination catalyzed by hMEX-3C Ring finger domain remains evasive. In this study, we solved the crystal structure of dimeric Ring finger domain of hMEX-3C and compared it with the complex structure of MDM2/MDMX-UbcH5b-Ub. Our ubiquitination assay demonstrated that the Ring finger domain of hMEX-3C acts as a ubiquitin E3 ligase in vitro, cooperating with specific E2 to mediate ubiquitination. Then, we identified several key residues in Ring finger domain of hMEX-3C possibly involved in the interaction with E2-Ub conjugate and analyzed the E3 ligase activities of wild type and mutants at key sites. Additionally, zinc chelation experiments indicated that the intact structural stability is essential for the self-ubiquitination activity of the Ring finger domain of hMEX-3C. Taken together, our studies provided new insight into the mechanism of the Ring finger domain of hMEX-3C that may play an important role in eliciting antiviral immune responses and therapeutic interventions.
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Affiliation(s)
- Sayed Ala Moududee
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Yiyang Jiang
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Nshogoza Gilbert
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Guodong Xie
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Zheng Xu
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Jihui Wu
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Qingguo Gong
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Yajun Tang
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
| | - Yunyu Shi
- Hefei National Laboratory for Physical Science at Microscale and School of Life SciencesUniversity of Science and Technology of ChinaHefeiAnhui230026People's Republic of China
- CAS Center for Excellence in Bio macromoleculesChinese Academy of SciencesBeijing100101People's Republic of China
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Chassé H, Aubert J, Boulben S, Le Corguillé G, Corre E, Cormier P, Morales J. Translatome analysis at the egg-to-embryo transition in sea urchin. Nucleic Acids Res 2018; 46:4607-4621. [PMID: 29660001 PMCID: PMC5961321 DOI: 10.1093/nar/gky258] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 03/09/2018] [Accepted: 03/28/2018] [Indexed: 11/12/2022] Open
Abstract
Early embryogenesis relies on the translational regulation of maternally stored mRNAs. In sea urchin, fertilization triggers a dramatic rise in translation activity, necessary for the onset of cell division. Here, the full spectrum of the mRNAs translated upon fertilization was investigated by polysome profiling and sequencing. The translatome of the early sea urchin embryo gave a complete picture of the polysomal recruitment dynamics following fertilization. Our results indicate that only a subset of maternal mRNAs were selectively recruited onto polysomes, with over-represented functional categories in the translated set. The increase in translation upon fertilization depends on the formation of translation initiation complexes following mTOR pathway activation. Surprisingly, mTOR pathway inhibition differentially affected polysomal recruitment of the newly translated mRNAs, which thus appeared either mTOR-dependent or mTOR-independent. Therefore, our data argue for an alternative to the classical cap-dependent model of translation in early development. The identification of the mRNAs translated following fertilization helped assign translational activation events to specific mRNAs. This translatome is the first step to a comprehensive analysis of the molecular mechanisms governing translation upon fertilization and the translational regulatory networks that control the egg-to-embryo transition as well as the early steps of embryogenesis.
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Affiliation(s)
- Héloïse Chassé
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
- Sorbonne Université, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
| | - Julie Aubert
- UMR MIA-Paris, AgroParisTech, INRA, Université Paris-Saclay, 75005 Paris, France
| | - Sandrine Boulben
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
- Sorbonne Université, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
| | - Gildas Le Corguillé
- CNRS, Sorbonne Université, FR2424, ABiMS, Station Biologique, 29680 Roscoff, France
| | - Erwan Corre
- CNRS, Sorbonne Université, FR2424, ABiMS, Station Biologique, 29680 Roscoff, France
| | - Patrick Cormier
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
- Sorbonne Université, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
| | - Julia Morales
- CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
- Sorbonne Université, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, CS 90074, 29688 Roscoff Cedex, France
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25
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Spickard EA, Joshi PM, Rothman JH. The multipotency-to-commitment transition in Caenorhabditis elegans-implications for reprogramming from cells to organs. FEBS Lett 2018; 592:838-851. [PMID: 29334121 DOI: 10.1002/1873-3468.12977] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 12/22/2017] [Accepted: 01/11/2018] [Indexed: 12/13/2022]
Abstract
In animal embryos, cells transition from a multipotential state, with the capacity to adopt multiple fates, into an irreversible, committed state of differentiation. This multipotency-to-commitment transition (MCT) is evident from experiments in which cell fate is reprogrammed by transcription factors for cell type-specific differentiation, as has been observed extensively in Caenorhabditis elegans. Although factors that direct differentiation into each of the three germ layer types cannot generally reprogram cells after the MCT in this animal, transcription factors for endoderm development are able to do so in multiple differentiated cell types. In one case, these factors can redirect the development of an entire organ in the process of "transorganogenesis". Natural transdifferentiation also occurs in a small number of differentiated cells during normal C. elegans development. We review these reprogramming and transdifferentiation events, highlighting the cellular and developmental contexts in which they occur, and discuss common themes underlying direct cell lineage reprogramming. Although certain aspects may be unique to the model system, growing evidence suggests that some mechanisms are evolutionarily conserved and may shed light on cellular plasticity and disease in humans.
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Affiliation(s)
- Erik A Spickard
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, CA, USA
| | - Pradeep M Joshi
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, CA, USA
| | - Joel H Rothman
- Department of MCD Biology and Neuroscience Research Institute, University of California Santa Barbara, CA, USA
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26
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Hildebrandt A, Alanis-Lobato G, Voigt A, Zarnack K, Andrade-Navarro MA, Beli P, König J. Interaction profiling of RNA-binding ubiquitin ligases reveals a link between posttranscriptional regulation and the ubiquitin system. Sci Rep 2017; 7:16582. [PMID: 29185492 PMCID: PMC5707401 DOI: 10.1038/s41598-017-16695-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 09/14/2017] [Indexed: 11/09/2022] Open
Abstract
RNA-binding ubiquitin ligases (RBULs) have the potential to link RNA-mediated mechanisms to protein ubiquitylation. Despite this, the cellular functions, substrates and interaction partners of most RBULs remain poorly characterized. Affinity purification (AP) combined with quantitative mass spectrometry (MS)-based proteomics is a powerful approach for analyzing protein functions. Mapping the physiological interaction partners of RNA-binding proteins has been hampered by their intrinsic properties, in particular the existence of low-complexity regions, which are prone to engage in non-physiological interactions. Here, we used an adapted AP approach to identify the interaction partners of human RBULs harboring different RNA-binding domains. To increase the likelihood of recovering physiological interactions, we combined control and bait-expressing cells prior to lysis. In this setup, only stable interactions that were originally present in the cell will be identified. We exploit gene function similarity between the bait proteins and their interactors to benchmark our approach in its ability to recover physiological interactions. We reveal that RBULs engage in stable interactions with RNA-binding proteins involved in different steps of RNA metabolism as well as with components of the ubiquitin conjugation machinery and ubiquitin-binding proteins. Our results thus demonstrate their capacity to link posttranscriptional regulation with the ubiquitin system.
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Affiliation(s)
- Andrea Hildebrandt
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany
| | - Gregorio Alanis-Lobato
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany.,Faculty of Biology, Johannes Gutenberg University, Gresemundweg 2, 55128, Mainz, Germany
| | - Andrea Voigt
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany
| | - Kathi Zarnack
- Buchmann Institute for Molecular Life Sciences (BMLS), Goethe University Frankfurt, Max-von-Laue-Str. 15, 60438, Frankfurt, Germany
| | - Miguel A Andrade-Navarro
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany.,Faculty of Biology, Johannes Gutenberg University, Gresemundweg 2, 55128, Mainz, Germany
| | - Petra Beli
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany.
| | - Julian König
- Institute of Molecular Biology (IMB), Ackermannweg 4, 55128, Mainz, Germany.
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27
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Huang Y, Fang C, Shi JW, Wen Y, Liu D. Identification of hMex-3A and its effect on human bladder cancer cell proliferation. Oncotarget 2017; 8:61215-61225. [PMID: 28977858 PMCID: PMC5617418 DOI: 10.18632/oncotarget.18050] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 04/25/2017] [Indexed: 11/25/2022] Open
Abstract
In this study, hMex-3A was selected from TCGA database as a research object to observe the effects of small interfering RNA (siRNA) targeting hMex-3A on the biological activities of human bladder cancer and explore its mechanism for the first time. In this study, there were 2 groups including negative control group and hMex-3A-siRNA-transfected cells group for 5637 and T24 cell lines, respectively. After bladder cancer cells were transfected with the interference RNA sequence, proliferation of transfected cells were assessed by Celigo Cell Counting, and apoptosis were detected by flow cytometry. The knockdown rate of hMex-3A was 74% in 5637 cells and 68% in T24 cells after RNA interference. In addition, Celigo Cell Counting indicated that cell viability was significantly lower in hMex-3A-siRNA-transfected cells group (2196/well) than in negative control group (6777/well) (P < 0.05), but T24 cells did not show statistical significance between hMex-3A-siRNA-transfected cells group (5799/well) and negative control group (7899/well) (P >0.05). Flow cytometer showed that apoptosis was the highest and cells were significantly blocked after cells were transfected in hMex-3A-siRNA-transfected cells group in 5 days later (P < 0.05). Mex-3A protein was detected in bladder carcinoma sections with a mean staining intensity of 7.06±2.60. Mex-3A protein expression was significantly higher in cancerous tissue than in para-cancerous tissue (P <0.05). Our study suggested that siRNA targeting hMex-3A could markedly inhibit cell proliferation and promote apoptosis in 5637 cells. These might have significant implications to bladder carcinogenesis and serve as a potential target for the treatment of bladder cancer.
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Affiliation(s)
- Ying Huang
- Department of Ultrasound, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Chao Fang
- Department of Ultrasound, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Jing-Wen Shi
- Department of Ultrasound, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Yu Wen
- Department of Histoembryology, China Medical University, Shenyang 110000, China
| | - Da Liu
- Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang 110004, China
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28
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Yang Y, Wang SY, Huang ZF, Zou HM, Yan BR, Luo WW, Wang YY. The RNA-binding protein Mex3B is a coreceptor of Toll-like receptor 3 in innate antiviral response. Cell Res 2016; 26:288-303. [PMID: 26823206 PMCID: PMC4783467 DOI: 10.1038/cr.2016.16] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 11/20/2015] [Accepted: 12/13/2015] [Indexed: 12/20/2022] Open
Abstract
Recognition of viral dsRNA by Toll-like receptor 3 (TLR3) leads to induction of interferons (IFNs) and proinflammatory cytokines, and innate antiviral response. Here we identified the RNA-binding protein Mex3B as a positive regulator of TLR3-mediated signaling by expression cloning screens. Cells from Mex3b−/− mice exhibited reduced production of IFN-β in response to the dsRNA analog poly(I:C) but not infection with RNA viruses. Mex3b−/− mice injected with poly(I:C) was more resistant to poly(I:C)-induced death. Mex3B was associated with TLR3 in the endosomes. It bound to dsRNA and increased the dsRNA-binding activity of TLR3. Mex3B also promoted the proteolytic processing of TLR3, which is critical for its activation. Mutants of Mex3B lacking its RNA-binding activity inhibited TLR3-mediated IFN-β induction. These findings suggest that Mex3B acts as a coreceptor of TLR3 in innate antiviral response.
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Affiliation(s)
- Yan Yang
- Wuhan Institute of Virology, State Key Laboratory of Virology, Chinese Academy of Sciences, Hubei 430071, China
| | - Su-Yun Wang
- Wuhan Institute of Virology, State Key Laboratory of Virology, Chinese Academy of Sciences, Hubei 430071, China
| | - Zhe-Fu Huang
- Wuhan Institute of Virology, State Key Laboratory of Virology, Chinese Academy of Sciences, Hubei 430071, China
| | - Hong-Mei Zou
- Wuhan Institute of Virology, State Key Laboratory of Virology, Chinese Academy of Sciences, Hubei 430071, China
| | - Bing-Ru Yan
- Collaborative Innovation Center for Viral Immunology, Medical Research Institute, College of Life Sciences, Wuhan University, Hubei 430072, China
| | - Wei-Wei Luo
- Collaborative Innovation Center for Viral Immunology, Medical Research Institute, College of Life Sciences, Wuhan University, Hubei 430072, China
| | - Yan-Yi Wang
- Wuhan Institute of Virology, State Key Laboratory of Virology, Chinese Academy of Sciences, Hubei 430071, China
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29
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Le Borgne M, Chartier N, Buchet-Poyau K, Destaing O, Faurobert E, Thibert C, Rouault JP, Courchet J, Nègre D, Bouvard D, Albiges-Rizo C, Rousseaux S, Khochbin S, Segretain D, Crépieux P, Guillou F, Durand P, Perrard MH, Billaud M. The RNA-binding protein Mex3b regulates the spatial organization of the Rap1 pathway. Development 2014; 141:2096-107. [DOI: 10.1242/dev.108514] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The four related mammalian MEX-3 RNA-binding proteins are evolutionarily conserved molecules for which the in vivo functions have not yet been fully characterized. Here, we report that male mice deficient for the gene encoding Mex3b are subfertile. Seminiferous tubules of Mex3b-deficient mice are obstructed as a consequence of the disrupted phagocytic capacity of somatic Sertoli cells. In addition, both the formation and the integrity of the blood-testis barrier are compromised owing to mislocalization of N-cadherin and connexin 43 at the surface of Sertoli cells. We further establish that Mex3b acts to regulate the cortical level of activated Rap1, a small G protein controlling phagocytosis and cell-cell interaction, through the activation and transport of Rap1GAP. The active form of Rap1 (Rap1-GTP) is abnormally increased at the membrane cortex and chemically restoring Rap1-GTP to physiological levels rescues the phagocytic and adhesion abilities of Sertoli cells. Overall, these findings implicate Mex3b in the spatial organization of the Rap1 pathway that orchestrates Sertoli cell functions.
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Affiliation(s)
- Maïlys Le Borgne
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Nicolas Chartier
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Karine Buchet-Poyau
- Hospices Civils de Lyon, Pôle Information Médicale Evaluation Recherche, Lyon F-69003, France
| | - Olivier Destaing
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Eva Faurobert
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Chantal Thibert
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Jean-Pierre Rouault
- Institut de Génomique Fonctionnelle de Lyon, UMR5242 CNRS/INRA/UCBL/ENS, Ecole Normale Supérieure de Lyon, 46, allée d'Italie, Lyon 69364, Cedex 07, France
| | - Julien Courchet
- Columbia University Department of Neurosciences, New York, NY 10032, USA
| | - Didier Nègre
- Université de Lyon, Inserm, EVIR, U758, Human Virology Department, Ecole Normale Supérieure de Lyon, Université Lyon 1, Lyon F-69007, France
| | - Daniel Bouvard
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Corinne Albiges-Rizo
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Sophie Rousseaux
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Saadi Khochbin
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
| | - Dominique Segretain
- UMR S775, University Paris Descartes, 45 rue des Saints Pères, Paris 75006, France
- University of Versailles, Saint Quentin 78035, France
| | - Pascale Crépieux
- Physiologie de la Reproduction et des Comportements, UMR 7247 INRA-CNRS-Université de Tours, Nouzilly 37380, France
| | - Florian Guillou
- Physiologie de la Reproduction et des Comportements, UMR 7247 INRA-CNRS-Université de Tours, Nouzilly 37380, France
| | - Philippe Durand
- Institut de Génomique Fonctionnelle de Lyon, UMR5242 CNRS/INRA/UCBL/ENS, Ecole Normale Supérieure de Lyon, 46, allée d'Italie, Lyon 69364, Cedex 07, France
| | - Marie-Hélène Perrard
- Institut de Génomique Fonctionnelle de Lyon, UMR5242 CNRS/INRA/UCBL/ENS, Ecole Normale Supérieure de Lyon, 46, allée d'Italie, Lyon 69364, Cedex 07, France
| | - Marc Billaud
- INSERM, U823; Université Joseph Fourier-Grenoble 1; Institut Albert Bonniot, Grenoble F-38700, France
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30
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Pivotal role of RNA-binding E3 ubiquitin ligase MEX3C in RIG-I-mediated antiviral innate immunity. Proc Natl Acad Sci U S A 2014; 111:5646-51. [PMID: 24706898 DOI: 10.1073/pnas.1401674111] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The RIG-I-like receptors, retinoic acid inducible gene-1 (RIG-I), melanoma differentiation-associated protein 5, and laboratory of genetics and physiology-2, are cytoplasmic sensors for RNA viruses that mediate the antiviral innate immune responses. We demonstrate that really interesting new gene-finger domain- and K homology domain-containing MEX3C regulates RIG-I function. MEX3C colocalizes with RIG-I in the stress granules of virally infected cells, and its overexpression causes the lysine-63-linked ubiquitination of RIG-I and activates IFN-β promoter. Embryonic fibroblast cells, macrophages, and conventional dendritic cells derived from Mex3c-deficient mice showed defective production of type I IFN after infection with RNA viruses that are recognized by RIG-I. These results demonstrate that MEX3C is an E3 ubiquitin ligase that modifies RIG-I in stress granules and plays a critical role in eliciting antiviral immune responses.
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