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Salib A, Jayatilleke N, Seneviratne JA, Mayoh C, De Preter K, Speleman F, Cheung BB, Carter DR, Marshall GM. MYCN and SNRPD3 cooperate to maintain a balance of alternative splicing events that drives neuroblastoma progression. Oncogene 2024; 43:363-377. [PMID: 38049564 PMCID: PMC10824661 DOI: 10.1038/s41388-023-02897-y] [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: 11/17/2022] [Revised: 11/05/2023] [Accepted: 11/14/2023] [Indexed: 12/06/2023]
Abstract
Many of the pro-tumorigenic functions of the oncogene MYCN are attributed to its regulation of global gene expression programs. Alternative splicing is another important regulator of gene expression and has been implicated in neuroblastoma development, however, the molecular mechanisms remain unknown. We found that MYCN up-regulated the expression of the core spliceosomal protein, SNRPD3, in models of neuroblastoma initiation and progression. High mRNA expression of SNRPD3 in human neuroblastoma tissues was a strong, independent prognostic factor for poor patient outcome. Repression of SNRPD3 expression correlated with loss of colony formation in vitro and reduced tumorigenicity in vivo. The effect of SNRPD3 on cell viability was in part dependent on MYCN as an oncogenic co-factor. RNA-sequencing revealed a global increase in the number of genes being differentially spliced when MYCN was overexpressed. Surprisingly, depletion of SNRPD3 in the presence of overexpressed MYCN further increased differential splicing, particularly of cell cycle regulators, such as BIRC5 and CDK10. MYCN directly bound SNRPD3, and the protein arginine methyltransferase, PRMT5, consequently increasing SNRPD3 methylation. Indeed, the PRMT5 inhibitor, JNJ-64619178, reduced cell viability and SNRPD3 methylation in neuroblastoma cells with high SNRPD3 and MYCN expression. Our findings demonstrate a functional relationship between MYCN and SNRPD3, which maintains the fidelity of MYCN-driven alternative splicing in the narrow range required for neuroblastoma cell growth. SNRPD3 methylation and its protein-protein interface with MYCN represent novel therapeutic targets. Hypothetical model for SNRPD3 as a co-factor for MYCN oncogenesis. SNRPD3 and MYCN participate in a regulatory loop to balance splicing fidelity in neuroblastoma cells. First MYCN transactivates SNRPD3 to lead to high-level expression. Second, SNRPD3 and MYCN form a protein complex involving PRMT5. Third, this leads to balanced alterative splicing (AS) activitiy that is favorable to neuroblastoma. Together this forms as a therapeutic vulnerability where SNRPD3 perturbation or PRMT5 inhibitors are selectively toxic to neuroblastoma by conditionally disturbing splicing activity.
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Affiliation(s)
- Alice Salib
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia
- School of Women's and Children's Health, UNSW Sydney, Kensington, NSW, 2052, Australia
| | - Nisitha Jayatilleke
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia
| | - Janith A Seneviratne
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia
| | - Chelsea Mayoh
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia
- School of Women's and Children's Health, UNSW Sydney, Kensington, NSW, 2052, Australia
| | - Katleen De Preter
- Center for Medical Genetics (CMGG), Ghent University, Medical Research Building (MRB1), Ghent, Belgium
| | - Frank Speleman
- Center for Medical Genetics (CMGG), Ghent University, Medical Research Building (MRB1), Ghent, Belgium
| | - Belamy B Cheung
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia
- School of Women's and Children's Health, UNSW Sydney, Kensington, NSW, 2052, Australia
| | - Daniel R Carter
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia.
- School of Biomedical Engineering, University of Technology Sydney, Ultimo, NSW, 2007, Australia.
| | - Glenn M Marshall
- Children's Cancer Institute, Lowy Cancer Research Centre, UNSW Sydney, Kensington, NSW, 2052, Australia.
- Kids Cancer Centre, Sydney Children's Hospital, Randwick, NSW, 2031, Australia.
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Xia S, Menden HL, Mabry SM, Sampath V. HDAC6 and ERK/ADAM17 Regulate VEGF-Induced NOTCH Signaling in Lung Endothelial Cells. Cells 2023; 12:2231. [PMID: 37759454 PMCID: PMC10526732 DOI: 10.3390/cells12182231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 08/22/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023] Open
Abstract
Angiogenesis plays a critical role in various physiological and pathological processes and is regulated by VEGF. Histone Deacetylase 6 (HDAC6) is a class IIB HDAC that regulates cytoplasmic signaling through deacetylation and is emerging as a target for modulating angiogenesis. We investigated the hypothesis that VEGF-induced endothelial cell (EC) NOTCH signaling is regulated by HDAC6 through acetylation of NOTCH intracellular cytoplasmic domain (NICD). In pulmonary endothelial cells (EC), VEGF-induced activation of the NICD transcriptional response was regulated by ERK1/2 and ADAM 17 and required DLL4. While HDAC6 inhibition induced the acetylation of NICD and stabilized NICD, it repressed NICD-SNW1 binding required for the NOTCH transcriptional responses. In vitro experiments showed that HDAC6 inhibition inhibited lung EC angiogenesis, and neonatal mice treated with a systemic HDAC6 inhibitor had significantly altered angiogenesis and alveolarization. These findings shed light on the role of HDAC6 in modulating VEGF-induced angiogenesis through acetylation and repression of the transcriptional regulators, NICD and SNW1.
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Affiliation(s)
| | | | | | - Venkatesh Sampath
- Division of Neonatology, Department of Pediatrics, Children’s Mercy, Kansas City, MO 64108, USA; (S.X.); (H.L.M.); (S.M.M.)
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She C, Zhu J, Liu A, Xu Y, Jiang Z, Peng Y. Dexmedetomidine Inhibits NF-κB-Transcriptional Activity in Neurons Undergoing Ischemia-Reperfusion by Regulating O-GlcNAcylation of SNW1. J Neuropathol Exp Neurol 2022; 81:836-849. [PMID: 35818332 DOI: 10.1093/jnen/nlac055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Dexmedetomidine (Dex) is neuroprotective in ischemia-reperfusion (I/R) by suppressing inflammation but the underlying molecular mechanisms are not known. SNW domain-containing protein 1 (SNW1) is a coactivator of the pro-inflammatory transcription factor NF-κB p65. Because SNW1 is regulated by O-GlcNAcylation, we aimed to determine whether this modification influences NF-κB transcriptional activity in neurons undergoing I/R and how Dex may affect the O-GlcNAcylation of SNW1. SH-SY5Y and PC12 cells under hypoxia/reoxygenation (H/R) conditions were treated with Dex and with inhibitors of O-GlcNAc transferase (OGT). O-GlcNAc levels in SNW1 and effects of SNW1 on NF-κB p65 were determined by immunoprecipitation. H/R increased SNW1 protein levels but inhibited O-GlcNAcylation of SNW1. A Luciferase reporter assay demonstrated that increased SNW1 levels led to increased NF-κB p65 activity and increased secretion of neuron-derived inflammatory factors demonstrated by ELISA. Dex reversed the H/R-induced increase of SNW1 protein by upregulating OGT and enhancing O-GlcNAcylation of SNW1. Dex suppression of the SNW1/NF-κB complex resulted in neuroprotection in vitro and in a middle cerebral artery occlusion model in vivo. PKA and ERK1/2 inhibitors abolished the effect of Dex on OGT protein. Taken together, these data indicate that Dex inhibits NF-κB-transcriptional activity in neurons undergoing I/R by regulating O-GlcNAcylation of SNW1.
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Affiliation(s)
- Chang She
- From the 5th Department of Cardiology, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, P.R. China.,Department of Otolaryngology Head and Neck Surgery, Affiliated Hospital of Hunan Normal University, The Fourth Hospital of Changsha, Changsha, Hunan, P.R. China
| | - Jiahua Zhu
- 2nd Emergency Department, Hunan Provincial People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan, P.R. China
| | - An Liu
- Third Xiangya Hospital Central South University, Changsha, Hunan, P.R. China
| | - Yangting Xu
- Third Xiangya Hospital Central South University, Changsha, Hunan, P.R. China
| | - Zhengqian Jiang
- Third Xiangya Hospital Central South University, Changsha, Hunan, P.R. China
| | - Ya Peng
- Department of Otolaryngology Head and Neck Surgery, Affiliated Hospital of Hunan Normal University, The Fourth Hospital of Changsha, Changsha, Hunan, P.R. China
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Xu L, Zhou X, Wu Y, Yang J, Xu H. A novel SNW/SKIP domain-containing protein, Bx42, is involved in the antibacterial responses of Macrobrachium nipponense. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2020; 113:103788. [PMID: 32692995 DOI: 10.1016/j.dci.2020.103788] [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: 05/26/2020] [Revised: 06/29/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
Bx42, the homologue of SNW1 in mammals, is involved in pre-mRNA splicing and transcriptional regulation. However, the presence and function of Bx42 have remained poorly understood in invertebrates until now. In the current study, a novel SNW domain-containing protein (MnBx42) from Macrobrachium nipponense was identified, and its potential role in the immune response was investigated. The full-length MnBx42 was 7467 bp with an open reading frame of 1653 bp, encoding 550 amino acids. Real-time PCR analysis suggested that MnBx42 was predominantly expressed in the intestine, gills and hepatopancreas, and immunofluorescence assays indicated that it was located in the nucleus. Its expression level was significantly decreased in M. nipponense post-challenge with white spot syndrome virus (WSSV) as well as Aeromonas hydrophila and Staphylococcus aureus, implying its participation in the innate immune response. The knockdown of MnBx42 in vivo notably increased the susceptibility of the prawns to bacterial infection, markedly increased the bacterial load in the gills, and significantly attenuated the phagocytic activity of haemocytes. Dual-luciferase reporter assays illustrated that MnBx42 could activate the NF-κB pathway. Consistent with this, when MnBx42 was silenced in vivo, the expression levels of antimicrobial peptides (AMPs), including ALF2, ALF3, ALF4, ALF5, Cru1 and Cru2, and NF-κB signalling genes, including dorsal, relish, TAK1, TAB1, Ikkβ, and Ikkε, were significantly reduced. Taken together, these findings may provide new insights about Bx42 in crustaceans and pave the way for a better understanding of the crustacean innate immune system.
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Affiliation(s)
- Liaoyi Xu
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang Province, China.
| | - Xiefei Zhou
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang Province, China.
| | - Yue Wu
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang Province, China.
| | - JingJing Yang
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang Province, China.
| | - Haisheng Xu
- College of Animal Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou, 310058, Zhejiang Province, China.
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Häfner S. Binding Nemo. Microbes Infect 2020; 23:S1286-4579(20)30184-2. [PMID: 33470213 DOI: 10.1016/j.micinf.2020.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 10/15/2020] [Indexed: 10/23/2022]
Abstract
Article highlight based on "SNW1 interacts with IKKγ to positively regulate antiviral innate immune responses against influenza A virus infection" by Qiao et al.
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Affiliation(s)
- Sophia Häfner
- University of Copenhagen, BRIC Biotech, Research & Innovation Centre, Lund Group, 2200, Copenhagen, Denmark.
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An Y, Liu Z, Ding H, Lv Q, Fan H, Hou S, Cai W, Liu S. MiR-375-3p regulates rat pulmonary microvascular endothelial cell activity by targeting Notch1 during hypoxia. J Int Med Res 2020; 48:300060520926851. [PMID: 32644005 PMCID: PMC7350404 DOI: 10.1177/0300060520926851] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Objective Pulmonary microvascular endothelial cells (PMECs) exhibit specific responses in adaptation to hypoxia. However, the mechanisms regulating PMEC activities during hypoxia remain unclear. This study investigated the potential involvement of a microRNA, miR-375-3p, in the regulation of PMEC activities. Methods Primary PMECs were isolated from rats. The expression levels of miR-375-3p and Notch1 in the PMECs were detected by quantitative PCR and western blotting. Luciferase reporter assays were performed to explore the transcriptional regulation of Notch1 by miR-375-3p. The proliferation and chemotaxis of the PMECs were measured with the Cell Counting Kit-8 and Transwell invasion assays, respectively. Additionally, the capacity of hypoxia-treated PMECs for angiogenesis and inflammatory response was determined with tube formation assays and ELISA, respectively. Results The expression of miR-375-3p and Notch1 in the PMECs was significantly down-regulated and up-regulated during hypoxia, respectively. The results demonstrated that miR-375-3p directly targets Notch1 in PMECs, thereby suppressing the transcriptional expression of Notch1. It was further revealed that miR-375-3p regulates the proliferation, chemotaxis, angiogenesis, and inflammatory response of PMECs. Conclusions Our findings revealed the important role of miR-375-3p in the regulation of PMEC function and suggest the potential involvement of miR-375-3p in the development of lung diseases.
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Affiliation(s)
- Yuan An
- Tianjin Medical University, Tianjin, P. R. China.,Qinhuangdao Haigang Hospital, Heibei, P. R. China
| | - Ziquan Liu
- Institute of Disaster Medicine, Tianjin University, Tianjin, P. R. China
| | - Hui Ding
- The Second Affiliated Hospital of Shaanxi University of Chinese Medicine, Tianjin, P. R. China
| | - Qi Lv
- Institute of Disaster Medicine, Tianjin University, Tianjin, P. R. China
| | - Haojun Fan
- Institute of Disaster Medicine, Tianjin University, Tianjin, P. R. China
| | - Shike Hou
- Institute of Disaster Medicine, Tianjin University, Tianjin, P. R. China
| | - Wei Cai
- Logistics College of Chinese People's Armed Police Forces, Tianjin, P. R. China
| | - Sanli Liu
- Logistics College of Chinese People's Armed Police Forces, Tianjin, P. R. China
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Identification of Functional Interactome of Gastric Cancer Cells with Helicobacter pylori Outer Membrane Protein HpaA by HPLC-MS/MS. BIOMED RESEARCH INTERNATIONAL 2020; 2020:1052926. [PMID: 32566649 PMCID: PMC7293730 DOI: 10.1155/2020/1052926] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 05/02/2020] [Accepted: 05/28/2020] [Indexed: 12/28/2022]
Abstract
HpaA as an outer membrane protein of Helicobacter pylori (H. pylori) plays a significant role in the adhesion to the human stomach, but the functional relation between HpaA and gastric epithelial cells is still not clear. To screen the interaction between HpaA and cellular proteins in gastric epithelial cells, the HpaA protein from H. pylori 26695 fused with a tag (6× His) was expressed and purified successfully, the secondary structure was estimated by the Circular Dichroism (CD) spectrum, and the purified recombinant protein was used to perform the pull-down assays with gastric cancer cell lines (AGS and SGC-7901) lysates, respectively. The pull-down proteins were identified by high-performance liquid chromatography tandem mass spectrometry system (HPLC-MS/MS). A total of 9 and 13 proteins related were analyzed from AGS and SGC-7901 cell lysates, respectively. ANXA2 was considered as putative HpaA functional partner discovered from lysates of both cell lines with high score and coverage. It is hypothesized that HpaA may be involved in the biological process of regulation of transcription and nucleic acid metabolism during the adhesion of H. pylori to human gastric epithelial cells, and HpaA-binding proteins also be used as targets for the development of antiadhesion drugs against H. pylori.
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Ring A, Zenz T. Genetics of "high-risk" chronic lymphocytic leukemia in the times of chemoimmunotherapy. Haematologica 2020; 105:1180-1182. [PMID: 32358080 DOI: 10.3324/haematol.2020.246504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Alexander Ring
- Department of Medical Oncology and Haematology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
| | - Thorsten Zenz
- Department of Medical Oncology and Haematology, University Hospital Zurich and University of Zurich, Zurich, Switzerland
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Zhou JG, Liang B, Jin SH, Liao HL, Du GB, Cheng L, Ma H, Gaipl US. Development and Validation of an RNA-Seq-Based Prognostic Signature in Neuroblastoma. Front Oncol 2019; 9:1361. [PMID: 31867276 PMCID: PMC6904333 DOI: 10.3389/fonc.2019.01361] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 11/18/2019] [Indexed: 12/25/2022] Open
Abstract
Objective: The stratification of neuroblastoma (NBL) prognosis remains difficult. RNA-based signatures might be able to predict prognosis, but independent cross-platform validation is still rare. Methods: RNA-Seq-based profiles from NBL patients were acquired and then analyzed. The RNA-Seq prognostic index (RPI) and the clinically adjusted RPI (RCPI) were successively established in the training cohort (TARGET-NBL) and then verified in the validation cohort (GSE62564). Survival prediction was assessed using a time-dependent receiver operating characteristic (ROC) curve and area under the ROC curve (AUC). Functional enrichment analysis of the genes was conducted using bioinformatics methods. Results: In the training cohort, 10 gene pairs were eventually integrated into the RPI. In both cohorts, the high-risk group had poor overall survival (OS) (P < 0.001 and P < 0.001, respectively) and favorable event-free survival (EFS) (P = 0.00032 and P = 0.06, respectively). ROC curve analysis also showed that the RPI predicted OS (60 month AUC values of 0.718 and 0.593, respectively) and EFS (60 month AUC values of 0.627 and 0.852, respectively) well in both the training and validation cohorts. Clinicopathological indicators associated with prognosis in the univariate and multivariate regression analyses were identified and added to the RPI to form the RCPI. The RCPI was also used to divide populations into different risk groups, and the high-risk group had poor OS (P < 0.001 and P < 0.001, respectively) and EFS (P < 0.05 and P < 0.05, respectively). Finally, the RCPI had higher accuracy than the RPI for the prediction of OS (60 month AUC values of 0.730 and 0.852, respectively) and EFS (60 month AUC values of 0.663 and 0.763, respectively) in both the training and validation cohorts. Moreover, these differentially expressed genes may be involved in certain NBL-related events. Conclusions: The RCPI could reliably categorize NBL patients based on different risks of death.
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Affiliation(s)
- Jian-Guo Zhou
- Department of Oncology, Affiliated Hospital of Zunyi Medical University, Zunyi, China.,Department of Radiation Oncology, Universitätsklinikum Erlangen, Erlangen, Germany
| | - Bo Liang
- Affiliated Nanjing Hospital of Chinese Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Su-Han Jin
- Department of Orthodontics, Affiliated Stemmatological Hospital of Zunyi Medical University, Zunyi, China
| | - Hui-Ling Liao
- College of Integrated Traditional Chinese and Western Medicine, Southwest Medical University, Luzhou, China
| | - Guo-Bo Du
- Department of Oncology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Long Cheng
- Department of Oncology, Affiliated Hospital of North Sichuan Medical College, Nanchong, China
| | - Hu Ma
- Department of Oncology, Affiliated Hospital of Zunyi Medical University, Zunyi, China
| | - Udo S Gaipl
- Department of Radiation Oncology, Universitätsklinikum Erlangen, Erlangen, Germany
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