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Canalis E, Yu J, Singh V, Mocarska M, Schilling L. NOTCH2 sensitizes the chondrocyte to the inflammatory response of tumor necrosis factor α. J Biol Chem 2023; 299:105372. [PMID: 37865314 PMCID: PMC10692730 DOI: 10.1016/j.jbc.2023.105372] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/06/2023] [Accepted: 10/15/2023] [Indexed: 10/23/2023] Open
Abstract
Notch regulates the immune and inflammatory response and has been associated with the pathogenesis of osteoarthritis in humans and preclinical models of the disease. Notch2tm1.1Ecan mice harbor a NOTCH2 gain-of-function and are sensitized to osteoarthritis, but the mechanisms have not been explored. We examined the effects of tumor necrosis factor α (TNFα) in chondrocytes from Notch2tm1.1Ecan mice and found that NOTCH2 enhanced the effect of TNFα on Il6 and Il1b expression. Similar results were obtained in cells from a conditional model of NOTCH2 gain-of-function, Notch22.1Ecan mice, and following the expression of the NOTCH2 intracellular domain in vitro. Recombination signal-binding protein for immunoglobulin Kappa J region partners with the NOTCH2 intracellular domain to activate transcription; in the absence of Notch signaling it inhibits transcription, and Rbpj inactivation in chondrocytes resulted in Il6 induction. Although TNFα induced IL6 to a greater extent in the context of NOTCH2 activation, there was a concomitant inhibition of Notch target genes Hes1, Hey1, Hey2, and Heyl. Electrophoretic mobility shift assay demonstrated displacement of recombination signal-binding protein for immunoglobulin Kappa J region from DNA binding sites by TNFα explaining the increased Il6 expression and the concomitant decrease in Notch target genes. NOTCH2 enhanced the effect of TNFα on NF-κB signaling, and RNA-Seq revealed increased expression of pathways associated with inflammation and the phagosome in NOTCH2 overexpressing cells in the absence and presence of TNFα. Collectively, NOTCH2 has important interactions with TNFα resulting in the enhanced expression of Il6 and inflammatory pathways in chondrocytes.
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Affiliation(s)
- Ernesto Canalis
- Department of Orthopaedic Surgery, UConn Health, Farmington, Connecticut, USA; Department of Medicine, UConn Health, Farmington, Connecticut, USA; UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut, USA.
| | - Jungeun Yu
- Department of Orthopaedic Surgery, UConn Health, Farmington, Connecticut, USA; UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut, USA
| | - Vijender Singh
- Computational Biology Core, Institute for System Genomics, UConn, Storrs, Connecticut, USA
| | - Magda Mocarska
- UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut, USA
| | - Lauren Schilling
- UConn Musculoskeletal Institute, UConn Health, Farmington, Connecticut, USA
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Pan L, Mulaw MA, Gout J, Guo M, Zarrin H, Schwarz P, Baumann B, Seufferlein T, Wagner M, Oswald F. RBPJ Deficiency Sensitizes Pancreatic Acinar Cells to KRAS-Mediated Pancreatic Intraepithelial Neoplasia Initiation. Cell Mol Gastroenterol Hepatol 2023; 16:783-807. [PMID: 37543088 PMCID: PMC10520364 DOI: 10.1016/j.jcmgh.2023.07.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 08/07/2023]
Abstract
BACKGROUND AND AIMS Development of pancreatic ductal adenocarcinoma (PDAC) is a multistep process intensively studied; however, precocious diagnosis and effective therapy still remain unsatisfactory. The role for Notch signaling in PDAC has been discussed controversially, as both cancer-promoting and cancer-antagonizing functions have been described. Thus, an improved understanding of the underlying molecular mechanisms is necessary. Here, we focused on RBPJ, the receiving transcription factor in the Notch pathway, examined its expression pattern in PDAC, and characterized its function in mouse models of pancreatic cancer development and in the regeneration process after acute pancreatitis. METHODS Conditional transgenic mouse models were used for functional analysis of RBPJ in the adult pancreas, initiation of PDAC precursor lesions, and pancreatic regeneration. Pancreata and primary acinar cells were tested for acinar-to-ductal metaplasia together with immunohistology and comprehensive transcriptional profiling by RNA sequencing. RESULTS We identified reduced RBPJ expression in a subset of human PDAC specimens. Ptf1α-CreERT-driven depletion of RBPJ in transgenic mice revealed that its function is dispensable for the homeostasis and maintenance of adult acinar cells. However, primary RBPJ-deficient acinar cells underwent acinar-to-ductal differentiation in ex vivo. Importantly, oncogenic KRAS expression in the context of RBPJ deficiency facilitated the development of pancreatic intraepithelial neoplasia lesions with massive fibrotic stroma formation. Interestingly, RNA-sequencing data revealed a transcriptional profile associated with the cytokine/chemokine and extracellular matrix changes. In addition, lack of RBPJ delays the course of acute pancreatitis and critically impairs it in the context of KRASG12D expression. CONCLUSIONS Our findings imply that downregulation of RBPJ in PDAC patients derepresses Notch targets and promotes KRAS-mediated pancreatic acinar cells transformation and desmoplasia development.
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Affiliation(s)
- Leiling Pan
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Medhanie A Mulaw
- Unit for Single-cell Genomics, Medical Faculty, Ulm University, Ulm, Germany
| | - Johann Gout
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Min Guo
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Hina Zarrin
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Peggy Schwarz
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Bernd Baumann
- Institute of Physiological Chemistry, Ulm University, Ulm, Germany
| | - Thomas Seufferlein
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Martin Wagner
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany
| | - Franz Oswald
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, Ulm, Germany.
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Pan B, Wang Z, Zhang X, Shen S, Ke X, Qiu J, Yao Y, Wu X, Wang X, Tang N. Targeted inhibition of RBPJ transcription complex alleviates the exhaustion of CD8 + T cells in hepatocellular carcinoma. Commun Biol 2023; 6:123. [PMID: 36717584 PMCID: PMC9887061 DOI: 10.1038/s42003-023-04521-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 01/23/2023] [Indexed: 02/01/2023] Open
Abstract
Impaired function of CD8+ T cells in hepatocellular carcinoma (HCC) is an important reason for acquired resistance. Compared with single-target inhibitors, small-molecule compounds that could both inhibit tumor cells and alleviate T cell exhaustion are more promising to reduce resistance. In this study, we screened immunosuppressive targets in HCC by combining cancer-immunity cycle score with weighted gene co-expression network and system analysis. Through in vitro and in vivo validation experiments, we found that one of the screened molecules, recombination signal binding protein for immunoglobulin kappa J region (RBPJ), was negatively correlated with CD8+ T cell mediated killing function. More importantly, its transcription complex inhibitor RIN1 not only inhibited the malignant biological behaviors of HCC cells by inhibiting mTOR pathway, but also reduced the expression of PD-L1 and L-kynurenine synthesis in HCC cells, thus alleviating T cell exhaustion. Meanwhile, the combination of RIN1 and anti-PD-1/PD-L1 antibodies could further activate CD8+ T cells. In short, RBPJ is an important factor regulating the function of T cells. Target inhibition of RBPJ transcription complex by small molecule compound may be a new strategy for immunotherapy of HCC.
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Affiliation(s)
- Banglun Pan
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Zengbin Wang
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoxia Zhang
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Shuling Shen
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoling Ke
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Jiacheng Qiu
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Yuxin Yao
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoxuan Wu
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiaoqian Wang
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China
- Cancer Center of Fujian Medical University, Fujian Medical University Union Hospital, Fuzhou, China
| | - Nanhong Tang
- Department of Hepatobiliary Surgery and Fujian Institute of Hepatobiliary Surgery, Fujian Medical University Union Hospital, Fuzhou, China.
- Cancer Center of Fujian Medical University, Fujian Medical University Union Hospital, Fuzhou, China.
- Key Laboratory of Ministry of Education for Gastrointestinal Cancer, Fujian Medical University, Fuzhou, China.
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Moldovan GE, Song Y, Kim TH, Su RW, Jeong JW, Gruzdev A, Spencer TE, Fazleabas AT. Notch effector recombination signal binding protein for immunoglobulin kappa J signaling is required for the initiation of endometrial stromal cell decidualization†. Biol Reprod 2022; 107:977-983. [PMID: 35835555 PMCID: PMC9562121 DOI: 10.1093/biolre/ioac140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 06/22/2022] [Accepted: 07/06/2022] [Indexed: 11/13/2022] Open
Abstract
The Notch signaling pathway is required for reproductive success. This pathway activates its transcriptional effector, recombination signal binding protein for immunoglobulin kappa J (Rbpj), to induce transcription of its target genes. This signaling pathway is required for successful decidualization, implantation, and uterine repair following parturition. To identify the compartmental specific roles of the Notch signaling pathway in the establishment of pregnancy, we generated epithelial and decidual stromal cell specific knockouts of Rbpj utilizing lactoferrin iCre and Prl8A2 iCre, respectively. Both conditional knockout mouse models were fertile. The Rbpj epithelial knockout mice displayed 27% resorption sites at E15.5, but this did not significantly impact the number of live born pups compared with controls. In addition, the Rbpj epithelial knockout mice displayed increased estrogen signaling in their stromal compartment. Given that both mouse models exhibited fertility comparable to control animals, the epithelial and stromal specific nature of the iCre recombinases utilized, and previously published Rbpj total uterine knockout mouse models, we conclude that Notch effector Rbpj signaling is required at the initiation of pregnancy to support decidualization in stromal cells, but that Rbpj is not required in the epithelial compartment nor is it required for post-implantation pregnancy success.
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Affiliation(s)
- Genna E Moldovan
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Yong Song
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Tae Hoon Kim
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Ren-Wei Su
- Department of Histology and Embryology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
| | - Jae-Wook Jeong
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - Artiom Gruzdev
- Knockout Mouse Core Facility, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, NC, USA
| | - Thomas E Spencer
- Divison of Animal Sciences, University of Missouri, Columbia, MO, USA
- Department of Obstetrics, Gynecology, and Women’s Health, University of Missouri, Columbia, MO, USA
| | - Asgerally T Fazleabas
- Department of Obstetrics, Gynecology and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
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Dreval K, Lake RJ, Fan HY. Analyzing the Interaction of RBPJ with Mitotic Chromatin and Its Impact on Transcription Reactivation upon Mitotic Exit. Methods Mol Biol 2022; 2472:95-108. [PMID: 35674895 DOI: 10.1007/978-1-0716-2201-8_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The sequence-specific transcription factor RBPJ, also known as CSL (CBF1, Su(H), Lag1), is an evolutionarily conserved protein that mediates Notch signaling to guide cell fates. When cells enter mitosis, DNA is condensed and most transcription factors dissociate from chromatin; however, a few, select transcription factors, termed bookmarking factors, remain associated. These mitotic chromatin-bound factors are believed to play important roles in maintaining cell fates through cell division. RBPJ is one such factor that remains mitotic chromatin associated and therefore could function as a bookmarking factor. Here, we describe how to obtain highly purified mitotic cells from the mouse embryonal carcinoma cell line F9, perform chromatin immunoprecipitation with mitotic cells, and measure the first run of RNA synthesis upon mitotic exit. These methods serve as basis to understand the roles of mitotic bookmarking by RBPJ in propagating Notch signals through cell division.
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Affiliation(s)
- Kostiantyn Dreval
- The Program in Cellular and Molecular Oncology, University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA
- Department of Internal Medicine, Division of Molecular Medicine, University of New Mexico Health Science Center, Albuquerque, NM, USA
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC, Canada
| | - Robert J Lake
- The Program in Cellular and Molecular Oncology, University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA
- Department of Internal Medicine, Division of Molecular Medicine, University of New Mexico Health Science Center, Albuquerque, NM, USA
| | - Hua-Ying Fan
- The Program in Cellular and Molecular Oncology, University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA.
- Department of Internal Medicine, Division of Molecular Medicine, University of New Mexico Health Science Center, Albuquerque, NM, USA.
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6
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Martos-Rodríguez CJ, Albarrán-Juárez J, Morales-Cano D, Caballero A, MacGrogan D, de la Pompa JL, Carramolino L, Bentzon JF. Fibrous Caps in Atherosclerosis Form by Notch-Dependent Mechanisms Common to Arterial Media Development. Arterioscler Thromb Vasc Biol 2021; 41:e427-e439. [PMID: 34261328 DOI: 10.1161/atvbaha.120.315627] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Objective Atheromatous fibrous caps are produced by smooth muscle cells (SMCs) that are recruited to the subendothelial space. We tested whether the recruitment mechanisms are the same as in embryonic artery development, which relies prominently on Notch signaling to form the subendothelial medial SMC layers. Approach and Results Notch elements were expressed in regions of fibrous cap in human and mouse plaques. To assess the causal role of Notch signaling in cap formation, we studied atherosclerosis in mice where the Notch pathway was inactivated in SMCs by conditional knockout of the essential effector transcription factor RBPJ (recombination signal-binding protein for immunoglobulin kappa J region). The recruitment of cap SMCs was significantly reduced without major effects on plaque size. Lineage tracing revealed the accumulation of SMC-derived plaque cells in the cap region was unaltered but that Notch-defective cells failed to re-acquire the SMC phenotype in the cap. Conversely, to analyze whether the loss of Notch signaling is required for SMC-derived cells to accumulate in atherogenesis, we studied atherosclerosis in mice with constitutive activation of Notch signaling in SMCs achieved by conditional expression of the Notch intracellular domain. Forced Notch signaling inhibited the ability of medial SMCs to contribute to plaque cells, including both cap SMCs and osteochondrogenic cells, and significantly reduced atherosclerosis development. Conclusions Sequential loss and gain of Notch signaling is needed to build the cap SMC population. The shared mechanisms with embryonic arterial media assembly suggest that the cap forms as a neo-media that restores the connection between endothelium and subendothelial SMCs, transiently disrupted in early atherogenesis.
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MESH Headings
- Actins/genetics
- Actins/metabolism
- Animals
- Arteries/metabolism
- Arteries/pathology
- Atherosclerosis/genetics
- Atherosclerosis/metabolism
- Atherosclerosis/pathology
- Cell Lineage
- Cells, Cultured
- Disease Progression
- Fibrosis
- Humans
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/genetics
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/metabolism
- Jagged-1 Protein/genetics
- Jagged-1 Protein/metabolism
- Male
- Mice, Inbred C57BL
- Mice, Knockout
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Plaque, Atherosclerotic
- Rats
- Receptors, Notch/genetics
- Receptors, Notch/metabolism
- Signal Transduction
- Tunica Media/metabolism
- Tunica Media/pathology
- Mice
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Affiliation(s)
- Carlos J Martos-Rodríguez
- Experimental Pathology of Atherosclerosis Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.J.M.-R., D.M.-C., A.C., L.C., J.F.B.)
| | - Julián Albarrán-Juárez
- Heart Diseases, Department of Clinical Medicine (J.A.-J., A.C., J.F.B.), Aarhus University, Denmark
| | - Daniel Morales-Cano
- Experimental Pathology of Atherosclerosis Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.J.M.-R., D.M.-C., A.C., L.C., J.F.B.)
| | - Ainoa Caballero
- Experimental Pathology of Atherosclerosis Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.J.M.-R., D.M.-C., A.C., L.C., J.F.B.)
- Heart Diseases, Department of Clinical Medicine (J.A.-J., A.C., J.F.B.), Aarhus University, Denmark
| | - Donal MacGrogan
- Intercellular Signalling in Cardiovascular Development and Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain (D.M., J.L.d.l.P.)
- Ciber de Enfermedades Cardiovasculares, Madrid, Spain (D.M., J.L.d.l.P.)
| | - José Luis de la Pompa
- Intercellular Signalling in Cardiovascular Development and Disease Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), Madrid, Spain (D.M., J.L.d.l.P.)
- Ciber de Enfermedades Cardiovasculares, Madrid, Spain (D.M., J.L.d.l.P.)
| | - Laura Carramolino
- Experimental Pathology of Atherosclerosis Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.J.M.-R., D.M.-C., A.C., L.C., J.F.B.)
| | - Jacob F Bentzon
- Experimental Pathology of Atherosclerosis Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain (C.J.M.-R., D.M.-C., A.C., L.C., J.F.B.)
- Heart Diseases, Department of Clinical Medicine (J.A.-J., A.C., J.F.B.), Aarhus University, Denmark
- Steno Diabetes Center Aarhus, Department of Clinical Medicine (J.F.B.), Aarhus University, Denmark
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Jin GL, Hong LM, Liu HP, Yue RC, Shen ZC, Yang J, Xu Y, Huang HH, Li Y, Xiong BJ, Su YP, Yu CX. Koumine modulates spinal microglial M1 polarization and the inflammatory response through the Notch-RBP-Jκ signaling pathway, ameliorating diabetic neuropathic pain in rats. Phytomedicine 2021; 90:153640. [PMID: 34330066 DOI: 10.1016/j.phymed.2021.153640] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 06/05/2021] [Accepted: 06/22/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Diabetic neuropathic pain (DNP), a complication of diabetes, has serious impacts on human health. As the pathogenesis of DNP is very complex, clinical treatments for DNP is limited. Koumine (KM) is an active ingredient extracted from Gelsemium elegans Benth. that exerts an inhibitory effect on neuropathic pain (NP) in several animal models. PURPOSE To clarify the anti-NP effect of KM on rats with DNP and the molecular mechanisms involving the Notch- Jκ recombination signal binding protein (RBP-Jκ) signaling pathway. METHODS Male Sprague-Dawley rats were administered streptozocin (STZ) by intraperitoneal injection to induce DNP. The effect of KM on mechanical hyperalgesia in rats with DNP was evaluated using the Von Frey test. Microglial polarization in the spinal cord was examined using western blotting and quantitative real-time PCR. The Notch-RBP-Jκ signaling pathway was analysed using western blotting. RESULTS KM attenuated DNP during the observation period. In addition, KM alleviated M1 microglial polarization in STZ-induced rats. Subsequent experiments revealed that Notch-RBP-Jκ signaling pathway was activated in the spinal cord of rats with DNP, and the activation of this pathways was decreased by KM. Additionally, KM-mediated analgesia and deactivation of the Notch-RBP-Jκ signaling pathway were inhibited by the Notch signaling agonist jagged 1, indicating that the anti-DNP effect of KM may be regulated by the Notch-RBP-Jκ signaling pathway. CONCLUSIONS KM is a potentially desirable candidate treatment for DNP that may inhibit microglial M1 polarization through the Notch-RBP-Jκ signaling pathway.
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Affiliation(s)
- Gui-Lin Jin
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China.
| | - Li-Mian Hong
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Department of Pharmacy, Quanzhou First Hospital Affiliated to Fujian Medical University, Quanzhou, Fujian 362000, P.R. China
| | - Hai-Ping Liu
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Rong-Cai Yue
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Zu-Cheng Shen
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Jian Yang
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Ying Xu
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Hui-Hui Huang
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Yi Li
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Bo-Jun Xiong
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Yan-Ping Su
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China
| | - Chang-Xi Yu
- Department of Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China; Fujian Key Laboratory of Natural Medicine Pharmacology, College of Pharmacy, Fujian Medical University, Fuzhou, Fujian, P.R. China.
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8
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Acar A, Hidalgo-Sastre A, Leverentz MK, Mills CG, Woodcock S, Baron M, Collu GM, Brennan K. Inhibition of Wnt signalling by Notch via two distinct mechanisms. Sci Rep 2021; 11:9096. [PMID: 33907274 PMCID: PMC8079408 DOI: 10.1038/s41598-021-88618-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 03/03/2021] [Indexed: 12/30/2022] Open
Abstract
Notch and Wnt are two essential signalling pathways that help to shape animals during development and to sustain adult tissue homeostasis. Although they are often active at the same time within a tissue, they typically have opposing effects on cell fate decisions. In fact, crosstalk between the two pathways is important in generating the great diversity of cell types that we find in metazoans. Several different mechanisms have been proposed that allow Notch to limit Wnt signalling, driving a Notch-ON/Wnt-OFF state. Here we explore these different mechanisms in human cells and demonstrate two distinct mechanisms by which Notch itself, can limit the transcriptional activity of β-catenin. At the membrane, independently of DSL ligands, Notch1 can antagonise β-catenin activity through an endocytic mechanism that requires its interaction with Deltex and sequesters β-catenin into the membrane fraction. Within the nucleus, the intracellular domain of Notch1 can also limit β-catenin induced transcription through the formation of a complex that requires its interaction with RBPjκ. We believe these mechanisms contribute to the robustness of cell-fate decisions by sharpening the distinction between opposing Notch/Wnt responses.
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Affiliation(s)
- Ahmet Acar
- Department of Biological Sciences, Middle East Technical University, Universiteler Mah. Dumlupınar Bulvarı 1, 06800, Çankaya, Ankara, Turkey.
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
| | - Ana Hidalgo-Sastre
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Michael K Leverentz
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Christopher G Mills
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Simon Woodcock
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Martin Baron
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK
| | - Giovanna M Collu
- Department of Developmental and Regenerative Biology, Icahn School of Medicine At Mount Sinai, One Gustave L. Levy Place, Box 1020, New York, NY, 10029, USA
| | - Keith Brennan
- Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
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Webb LMC, Fra‐Bido S, Innocentin S, Matheson LS, Attaf N, Bignon A, Novarino J, Fazilleau N, Linterman MA. Ageing promotes early T follicular helper cell differentiation by modulating expression of RBPJ. Aging Cell 2021; 20:e13295. [PMID: 33387451 PMCID: PMC7811847 DOI: 10.1111/acel.13295] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2020] [Revised: 11/17/2020] [Accepted: 12/05/2020] [Indexed: 12/12/2022] Open
Abstract
Ageing profoundly changes our immune system and is thought to be a driving factor in the morbidity and mortality associated with infectious disease in older people. We have previously shown that the impaired immunity to vaccination that occurs in aged individuals is partly attributed to the effect of age on T follicular helper (Tfh) cell formation. In this study, we examined how age intrinsically affects Tfh cell formation in both mice and humans. We show increased formation of Tfh precursors (pre-Tfh) but no associated increase in germinal centre (GC)-Tfh cells in aged mice, suggesting age-driven promotion of only early Tfh cell differentiation. Mechanistically, we show that ageing alters TCR signalling which drives expression of the Notch-associated transcription factor, RBPJ. Genetic or chemical modulation of RBPJ or Notch rescues this age-associated early Tfh cell differentiation, and increased intrinsic Notch activity recapitulates this phenomenon in younger mice. Our data offer mechanistic insight into the age-induced changes in T-cell activation that affects the differentiation and ultimately the function of effector T cells.
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Affiliation(s)
- Louise M. C. Webb
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteBabrahamUK
| | - Sigrid Fra‐Bido
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteBabrahamUK
| | - Silvia Innocentin
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteBabrahamUK
| | - Louise S. Matheson
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteBabrahamUK
| | - Noudjoud Attaf
- Toulouse Institute for Infectious and Inflammatory Diseases (Infinity)Inserm U1291University of ToulouseToulouse, FCNRS U5282France
| | - Alexandre Bignon
- Laboratory of Lymphocyte Signalling and DevelopmentBabraham InstituteBabrahamUK
| | - Julien Novarino
- Toulouse Institute for Infectious and Inflammatory Diseases (Infinity)Inserm U1291University of ToulouseToulouse, FCNRS U5282France
| | - Nicolas Fazilleau
- Toulouse Institute for Infectious and Inflammatory Diseases (Infinity)Inserm U1291University of ToulouseToulouse, FCNRS U5282France
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10
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Zhang G, Tanaka S, Jiapaer S, Sabit H, Tamai S, Kinoshita M, Nakada M. RBPJ contributes to the malignancy of glioblastoma and induction of proneural-mesenchymal transition via IL-6-STAT3 pathway. Cancer Sci 2020; 111:4166-4176. [PMID: 32885530 PMCID: PMC7648018 DOI: 10.1111/cas.14642] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 08/20/2020] [Accepted: 08/27/2020] [Indexed: 01/10/2023] Open
Abstract
Notch signaling plays a pivotal role in many cancers, including glioblastoma (GBM). Recombination signal binding protein for immunoglobulin kappa J region (RBPJ) is a key transcription factor of the Notch signaling pathway. Here, we interrogated the function of RBPJ in GBM. Firstly, RBPJ expression of GBM samples was examined. Then, we knocked down RBPJ expression in 2 GBM cell lines (U251 and T98) and 4 glioblastoma (GBM) stem-like cell lines derived from surgical samples of GBM (KGS01, KGS07, KGS10 and KGS15) to investigate the effect on cell proliferation, invasion, stemness, and tumor formation ability. Expression of possible downstream targets of RBPJ was also assessed. RBPJ was overexpressed in the GBM samples, downregulation of RBPJ reduced cell proliferation and the invasion ability of U251 and T98 cells and cell proliferation ability and stemness of glioblastoma stem-like cells (GSC) lines. These were accompanied by reduced IL-6 expression, reduced activation of STAT3, and inhibited proneural-mesenchymal transition (PMT). Tumor formation and PMT were also impaired by RBPJ knockdown in vivo. In conclusion, RBPJ promotes cell proliferation, invasion, stemness, and tumor initiation ability in GBM cells through enhanced activation of IL-6-STAT3 pathway and PMT, inhibition of RBPJ may constitute a prospective treatment for GBM.
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Affiliation(s)
- Guangtao Zhang
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
- Division of Life Sciences and MedicineDepartment of NeurosurgeryThe First Affiliated Hospital of USTCUniversity of Science and Technology of ChinaHefeiChina
| | - Shingo Tanaka
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
| | - Shabierjiang Jiapaer
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
| | - Hemragul Sabit
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
| | - Sho Tamai
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
| | - Masashi Kinoshita
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
| | - Mitsutoshi Nakada
- Department of NeurosurgeryGraduate School of Medical ScienceKanazawa UniversityKanazawaJapan
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Wang Y, Singh AR, Zhao Y, Du T, Huang Y, Wan X, Mukhopadhyay D, Wang Y, Wang N, Zhang P. TRIM28 regulates sprouting angiogenesis through VEGFR-DLL4-Notch signaling circuit. FASEB J 2020; 34:14710-14724. [PMID: 32918765 PMCID: PMC10115459 DOI: 10.1096/fj.202000186rrr] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Revised: 08/14/2020] [Accepted: 08/21/2020] [Indexed: 02/01/2023]
Abstract
Sprouting angiogenesis is a highly coordinately process controlled by vascular endothelial growth factor receptor (VEGFR)-Notch signaling. Here we investigated whether Tripartite motif-containing 28 (TRIM28), which is an epigenetic modifier implicated in gene transcription and cell differentiation, is essential to mediate sprouting angiogenesis. We observed that knockdown of TRIM28 ortholog in zebrafish resulted in developmental vascular defect with disorganized and reduced vasculatures. Consistently, TRIM28 knockdown inhibited angiogenic sprouting of cultured endothelial cells (ECs), which exhibited increased mRNA levels of VEGFR1, Delta-like (DLL) 3, and Notch2 but reduced levels of VEGFR2, DLL1, DLL4, Notch1, Notch3, and Notch4.The regulative effects of TRIM28 on these angiogenic factors were partially mediated by hypoxia-inducible factor 1 α (HIF-1α) and recombination signal-binding protein for immunoglobulin kappa J region (RBPJκ). In vitro DNA-binding assay showed that TRIM28 knockdown increased the association of RBPJκ with DNA sequences containing HIF-1α-binding sites. Moreover, the phosphorylation of TRIM28 was controlled by VEGF and Notch1 through a mechanism involving RBPJκ-dual-specificity phosphatase (DUSP)-p38 MAPK, indicating a negative feedback mechanism. These findings established TRIM28 as a crucial regulator of VEGFR-Notch signaling circuit through HIF-1α and RBPJκ in EC sprouting angiogenesis.
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Affiliation(s)
- Yinfang Wang
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Department of Cardiovascular Medicine, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Angom Ramcharan Singh
- Department of Biochemistry and Molecular Biology, College of Medicine and Science, Mayo Clinic, Jacksonville, FL, USA
| | - Yuanyuan Zhao
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Tao Du
- Department of Gastrointestinal Surgery, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yitong Huang
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Xiaohong Wan
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Shanghai Putuo Central School of Clinical Medicine, Anhui Medical University, Hefei, China
| | - Debabrata Mukhopadhyay
- Department of Biochemistry and Molecular Biology, College of Medicine and Science, Mayo Clinic, Jacksonville, FL, USA
| | - Ying Wang
- Department of Biochemistry and Molecular Biology, College of Medicine and Science, Mayo Clinic, Jacksonville, FL, USA
| | - Nanping Wang
- The Advanced Institute for Medical Sciences, Dalian Medical University, Dalian, China
| | - Peng Zhang
- Central Laboratory, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Department of Cardiovascular Medicine, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
- Shanghai Putuo Central School of Clinical Medicine, Anhui Medical University, Hefei, China
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Chen LY, Chen LW, Peng KT, Hung CH, Chang PJ, Wang SS. Sp3 Transcription Factor Cooperates with the Kaposi's Sarcoma-Associated Herpesvirus ORF50 Protein To Synergistically Activate Specific Viral and Cellular Gene Promoters. J Virol 2020; 94:e01143-20. [PMID: 32641483 PMCID: PMC7459565 DOI: 10.1128/jvi.01143-20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Accepted: 07/02/2020] [Indexed: 11/20/2022] Open
Abstract
The Kaposi's sarcoma-associated herpesvirus (KSHV)-encoded open reading frame 50 (ORF50) protein is the key transactivator responsible for the latent-to-lytic switch. Here, we investigated the transcriptional activation of the ORF56 gene (encoding a primase protein) by ORF50 and successfully identified an ORF50-responsive element located in the promoter region between positions -97 and -44 (designated 56p-RE). This 56p-RE element contains a noncanonical RBP-Jκ-binding sequence and a nonconsensus Sp1/Sp3-binding sequence. Electrophoretic mobility shift assays revealed that RBP-Jκ, Sp3, and ORF50 could form stable complexes on the 56p-RE element. Importantly, transient-reporter analysis showed that Sp3, but not RBP-Jκ or Sp1, acts in synergy with ORF50 to activate the 56p-RE-containing reporter construct, and the synergy mainly depends on the Sp1/Sp3-binding region of the 56p-RE element. Sequence similarity searches revealed that the promoters for ORF21 (thymidine kinase), ORF60 (ribonucleotide reductase, small subunit), and cellular interleukin-10 (IL-10) contain a sequence motif similar to the Sp1/Sp3-binding region of the 56p-RE element, and we found that these promoters could also be synergistically activated by ORF50 and Sp3 via the conserved motifs. Noteworthily, the conversion of the Sp1/Sp3-binding sequence of the 56p-RE element into a consensus high-affinity Sp-binding sequence completely lost the synergistic response to ORF50 and Sp3. Moreover, transcriptional synergy could not be detected through other ORF50-responsive elements from the viral PAN, K12, ORF57, and K6 promoters. Collectively, the results of our study demonstrate that ORF50 and Sp3 can act in synergy on the transcription of specific gene promoters, and we find a novel conserved cis-acting motif in these promoters essential for transcriptional synergy.IMPORTANCE Despite the critical role of ORF50 in the KSHV latent-to-lytic switch, the molecular mechanism by which ORF50 activates its downstream target genes, especially those that encode the viral DNA replication enzymes, is not yet fully understood. Here, we find that ORF50 can cooperate with Sp3 to synergistically activate promoters of the viral ORF56 (primase), ORF21 (thymidine kinase), and ORF60 (ribonucleotide reductase) genes via similar Sp1/Sp3-binding motifs. Additionally, the same synergistic effect can be seen on the promoter of the cellular IL-10 gene. Overall, our data reveal an important role for Sp3 in ORF50-mediated transactivation, and we propose a new subclass of ORF50-responsive elements in viral and cellular promoters.
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Affiliation(s)
- Li-Yu Chen
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Lee-Wen Chen
- Department of Respiratory Care, Chang-Gung University of Science and Technology, Chiayi, Taiwan
- Department of Pediatric Surgery, Chang-Gung Memorial Hospital, Chiayi, Taiwan
| | - Kuo-Ti Peng
- Department of Orthopedic Surgery, Chang-Gung Memorial Hospital, Chiayi, Taiwan
| | - Chien-Hui Hung
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
| | - Pey-Jium Chang
- Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang-Gung University, Taoyuan, Taiwan
- Department of Nephrology, Chang-Gung Memorial Hospital, Chiayi, Taiwan
| | - Shie-Shan Wang
- Department of Pediatric Surgery, Chang-Gung Memorial Hospital, Chiayi, Taiwan
- School of Medicine, Chang-Gung University, Taoyuan, Taiwan
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Affiliation(s)
- Xiaojing Qiao
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Daoqin Zhang
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Li Zhang
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Jiayi Yao
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Xiuju Wu
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Xinjiang Cai
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
| | - Kristina I Boström
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
- The Molecular Biology Institute at UCLA, Los Angeles, CA, USA
| | - Yucheng Yao
- Division of Cardiology, David Geffen School of Medicine at University of California Los Angeles (UCLA), Los Angeles, CA, USA
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14
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Lu Y, Zhang Y, Xiang X, Sharma M, Liu K, Wei J, Shao D, Li B, Tong G, Olszewski MA, Ma Z, Qiu Y. Notch signaling contributes to the expression of inflammatory cytokines induced by highly pathogenic porcine reproductive and respiratory syndrome virus (HP-PRRSV) infection in porcine alveolar macrophages. Dev Comp Immunol 2020; 108:103690. [PMID: 32222356 PMCID: PMC7765342 DOI: 10.1016/j.dci.2020.103690] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 02/28/2020] [Accepted: 03/23/2020] [Indexed: 05/08/2023]
Abstract
Notch signaling, an evolutionarily conserved signal pathway has emerged as a key signal pathway to regulate host immune response but the contribution of Notch signaling to immune response in pigs remains unknown. Infection of porcine alveolar macrophages (PAM) with porcine reproductive and respiratory syndrome virus (PRRSV) triggers expression of Jagged1 mRNA, suggesting that Notch signaling might play a role in the immune response to PRRSV infection. To further explore it, we examined the expression profile of Notch molecules in PAM following a highly pathogenic PRRSV (HP-PRRSV) strain infection. We demonstrated that HP-PRRSV infection resulted in the induction of Notch ligands (Jagged1, Dll3, Dll4), the transcription factor RBP-J, and the target gene Hes1, consistent with activation of Notch signaling. Next, using DAPT treatment and the knockdown of RBP-J illustrated that inhibition of activation of Notch signaling attenuated induction of the inflammatory cytokines (TNF-α and IL-1β) instead of viral replication in PAM during HP-PRRSV infection. Furthermore, the knockdown of Jagged1, the most induced ligand not only inhibited activation of Notch signaling, but also reduced the expression of inflammatory cytokines without any influence in viral replication. Moreover, our data revealed that several signaling including NF-κB, MAPK and Notch signaling contributed to the induction of Jagged1 in PAM during HP-PRRSV infection. In summary, these findings reveal that Notch as an important signaling pathway could contribute to the regulation of inflammatory response induced by HP-PRRSV infection.
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Affiliation(s)
- Yan Lu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Yanbing Zhang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Xiao Xiang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Mona Sharma
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Ke Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Jianchao Wei
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Donghua Shao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Beibei Li
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Guangzhi Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China
| | - Michal A Olszewski
- Division of Pulmonary & Critical Care Medicine, Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA; VA Ann Arbor Healthcare System, Ann Arbor, MI, USA
| | - Zhiyong Ma
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China.
| | - Yafeng Qiu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, China.
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15
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Lipsey CC, Harbuzariu A, Robey RW, Huff LM, Gottesman MM, Gonzalez-Perez RR. Leptin Signaling Affects Survival and Chemoresistance of Estrogen Receptor Negative Breast Cancer. Int J Mol Sci 2020; 21:E3794. [PMID: 32471192 PMCID: PMC7311967 DOI: 10.3390/ijms21113794] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/15/2020] [Accepted: 05/21/2020] [Indexed: 12/18/2022] Open
Abstract
Estrogen-receptor-negative breast cancer (BCER-) is mainly treated with chemotherapeutics. Leptin signaling can influence BCER- progression, but its effects on patient survival and chemoresistance are not well understood. We hypothesize that leptin signaling decreases the survival of BCER- patients by, in part, inducing the expression of chemoresistance-related genes. The correlation of expression of leptin receptor (OBR), leptin-targeted genes (CDK8, NANOG, and RBP-Jk), and breast cancer (BC) patient survival was determined from The Cancer Genome Atlas (TCGA) mRNA data. Leptin-induced expression of proliferation and chemoresistance-related molecules was investigated in triple-negative BC (TNBC) cells that respond differently to chemotherapeutics. Leptin-induced gene expression in TNBC was analyzed by RNA-Seq. The specificity of leptin effects was assessed using OBR inhibitors (shRNA and peptides). The results show that OBR and leptin-targeted gene expression are associated with lower survival of BCER- patients. Importantly, the co-expression of these genes was also associated with chemotherapy failure. Leptin signaling increased the expression of tumorigenesis and chemoresistance-related genes (ABCB1, WNT4, ADHFE1, TBC1D3, LL22NC03, RDH5, and ITGB3) and impaired chemotherapeutic effects in TNBC cells. OBR inhibition re-sensitized TNBC to chemotherapeutics. In conclusion, the co-expression of OBR and leptin-targeted genes may be used as a predictor of survival and drug resistance of BCER- patients. Targeting OBR signaling could improve chemotherapeutic efficacy.
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Affiliation(s)
- Crystal C. Lipsey
- Microbiology, Biochemistry, and Immunology, GEBS, Morehouse School of Medicine, Atlanta, GA 30310, USA; (C.C.L.); (A.H.)
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, MD 20892, USA; (R.W.R.); (L.M.H.); (M.M.G.)
| | - Adriana Harbuzariu
- Microbiology, Biochemistry, and Immunology, GEBS, Morehouse School of Medicine, Atlanta, GA 30310, USA; (C.C.L.); (A.H.)
| | - Robert W. Robey
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, MD 20892, USA; (R.W.R.); (L.M.H.); (M.M.G.)
| | - Lyn M. Huff
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, MD 20892, USA; (R.W.R.); (L.M.H.); (M.M.G.)
| | - Michael M. Gottesman
- Laboratory of Cell Biology, Center for Cancer Research, NCI, National Institutes of Health, Bethesda, MD 20892, USA; (R.W.R.); (L.M.H.); (M.M.G.)
| | - Ruben R. Gonzalez-Perez
- Microbiology, Biochemistry, and Immunology, GEBS, Morehouse School of Medicine, Atlanta, GA 30310, USA; (C.C.L.); (A.H.)
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Nurnberg ST, Guerraty MA, Wirka RC, Rao HS, Pjanic M, Norton S, Serrano F, Perisic L, Elwyn S, Pluta J, Zhao W, Testa S, Park Y, Nguyen T, Ko YA, Wang T, Hedin U, Sinha S, Barash Y, Brown CD, Quertermous T, Rader DJ. Genomic profiling of human vascular cells identifies TWIST1 as a causal gene for common vascular diseases. PLoS Genet 2020; 16:e1008538. [PMID: 31917787 PMCID: PMC6975560 DOI: 10.1371/journal.pgen.1008538] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 01/22/2020] [Accepted: 11/25/2019] [Indexed: 02/02/2023] Open
Abstract
Genome-wide association studies have identified multiple novel genomic loci associated with vascular diseases. Many of these loci are common non-coding variants that affect the expression of disease-relevant genes within coronary vascular cells. To identify such genes on a genome-wide level, we performed deep transcriptomic analysis of genotyped primary human coronary artery smooth muscle cells (HCASMCs) and coronary endothelial cells (HCAECs) from the same subjects, including splicing Quantitative Trait Loci (sQTL), allele-specific expression (ASE), and colocalization analyses. We identified sQTLs for TARS2, YAP1, CFDP1, and STAT6 in HCASMCs and HCAECs, and 233 ASE genes, a subset of which are also GTEx eGenes in arterial tissues. Colocalization of GWAS association signals for coronary artery disease (CAD), migraine, stroke and abdominal aortic aneurysm with GTEx eGenes in aorta, coronary artery and tibial artery discovered novel candidate risk genes for these diseases. At the CAD and stroke locus tagged by rs2107595 we demonstrate colocalization with expression of the proximal gene TWIST1. We show that disrupting the rs2107595 locus alters TWIST1 expression and that the risk allele has increased binding of the NOTCH signaling protein RBPJ. Finally, we provide data that TWIST1 expression influences vascular SMC phenotypes, including proliferation and calcification, as a potential mechanism supporting a role for TWIST1 in CAD.
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Affiliation(s)
- Sylvia T. Nurnberg
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Marie A. Guerraty
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Robert C. Wirka
- Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - H. Shanker Rao
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Milos Pjanic
- Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Scott Norton
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Felipe Serrano
- Department of Medicine, Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Ljubica Perisic
- Department of Molecular Medicine and Surgery, Karolinska Institute, Solna, Sweden
| | - Susannah Elwyn
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - John Pluta
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Wei Zhao
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Stephanie Testa
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - YoSon Park
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Trieu Nguyen
- Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Yi-An Ko
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Ting Wang
- Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Ulf Hedin
- Department of Molecular Medicine and Surgery, Karolinska Institute, Solna, Sweden
| | - Sanjay Sinha
- Department of Medicine, Division of Cardiovascular Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Yoseph Barash
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Christopher D. Brown
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Thomas Quertermous
- Department of Medicine, Stanford University School of Medicine, Stanford, California, United States of America
| | - Daniel J. Rader
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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17
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Gahr BM, Brändle F, Zimmermann M, Nagel AC. An RBPJ- Drosophila Model Reveals Dependence of RBPJ Protein Stability on the Formation of Transcription-Regulator Complexes. Cells 2019; 8:cells8101252. [PMID: 31615108 PMCID: PMC6829621 DOI: 10.3390/cells8101252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 10/07/2019] [Accepted: 10/10/2019] [Indexed: 01/07/2023] Open
Abstract
Notch signaling activity governs widespread cellular differentiation in higher animals, including humans, and is involved in several congenital diseases and different forms of cancer. Notch signals are mediated by the transcriptional regulator RBPJ in a complex with activated Notch (NICD). Analysis of Notch pathway regulation in humans is hampered by a partial redundancy of the four Notch receptor copies, yet RBPJ is solitary, allowing its study in model systems. In Drosophila melanogaster, the RBPJ orthologue is encoded by Suppressor of Hairless [Su(H)]. Using genome engineering, we replaced Su(H) by murine RBPJ in order to study its function in the fly. In fact, RBPJ largely substitutes for Su(H)’s function, yet subtle phenotypes reflect increased Notch signaling activity. Accordingly, the binding of RBPJ to Hairless (H) protein, the general Notch antagonist in Drosophila, was considerably reduced compared to that of Su(H). An H-binding defective RBPJLLL mutant matched the respective Su(H)LLL allele: homozygotes were lethal due to extensive Notch hyperactivity. Moreover, RBPJLLL protein accumulated at lower levels than wild type RBPJ, except in the presence of NICD. Apparently, RBPJ protein stability depends on protein complex formation with either H or NICD, similar to Su(H), demonstrating that the murine homologue underlies the same regulatory mechanisms as Su(H) in Drosophila. These results underscore the importance of regulating the availability of RBPJ protein to correctly mediate Notch signaling activity in the fly.
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Affiliation(s)
- Bernd M. Gahr
- Institute of Genetics (240), University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany; (B.M.G.); (F.B.); (M.Z.)
- Present address: Molecular Cardiology, Department of Internal Medicine II, University of Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Franziska Brändle
- Institute of Genetics (240), University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany; (B.M.G.); (F.B.); (M.Z.)
| | - Mirjam Zimmermann
- Institute of Genetics (240), University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany; (B.M.G.); (F.B.); (M.Z.)
| | - Anja C. Nagel
- Institute of Genetics (240), University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany; (B.M.G.); (F.B.); (M.Z.)
- Correspondence: ; Tel.: +49-711-45922210
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Serrano MDLA, Demarest BL, Tone-Pah-Hote T, Tristani-Firouzi M, Yost HJ. Inhibition of Notch signaling rescues cardiovascular development in Kabuki Syndrome. PLoS Biol 2019; 17:e3000087. [PMID: 31479440 PMCID: PMC6743796 DOI: 10.1371/journal.pbio.3000087] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 09/13/2019] [Accepted: 08/08/2019] [Indexed: 01/05/2023] Open
Abstract
Kabuki Syndrome patients have a spectrum of congenital disorders, including congenital heart defects, the primary determinant of mortality. Seventy percent of Kabuki Syndrome patients have mutations in the histone methyl-transferase KMT2D. However, the underlying mechanisms that drive these congenital disorders are unknown. Here, we generated and characterized zebrafish kmt2d null mutants that recapitulate the cardinal phenotypic features of Kabuki Syndrome, including microcephaly, palate defects, abnormal ear development, and cardiac defects. The cardiac phenotype consists of a previously unknown vasculogenesis defect that affects endocardium patterning and, consequently, heart ventricle lumen formation. Additionally, zebrafish kmt2d null mutants have angiogenesis defects depicted by abnormal aortic arch development, hyperactive ectopic blood vessel sprouting, and aberrant patterning of the brain vascular plexus. We demonstrate that zebrafish kmt2d null mutants have robust Notch signaling hyperactivation in endocardial and endothelial cells, including increased protein levels of the Notch transcription factor Rbpj. Our zebrafish Kabuki Syndrome model reveals a regulatory link between the Notch pathway and Kmt2d during endothelium and endocardium patterning and shows that pharmacological inhibition of Notch signaling rebalances Rbpj protein levels and rescues the cardiovascular phenotype by enhancing endothelial and endocardial cell proliferation and stabilizing endocardial patterning. Taken together, these findings demonstrate that Kmt2d regulates vasculogenesis and angiogenesis, provide evidence for interactions between Kmt2d and Notch signaling in Kabuki Syndrome, and suggest future directions for clinical research.
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Affiliation(s)
- Maria de los Angeles Serrano
- Molecular Medicine Program—Neurobiology and Anatomy Department, University of Utah, Salt Lake City, Utah, United States of America
| | - Bradley L. Demarest
- Molecular Medicine Program—Neurobiology and Anatomy Department, University of Utah, Salt Lake City, Utah, United States of America
| | | | - Martin Tristani-Firouzi
- Nora Eccles Harrison Cardiovascular Research and Training Institute and Division of Pediatric Cardiology, University of Utah, Salt Lake City, Utah, United States of America
| | - H. Joseph Yost
- Molecular Medicine Program—Neurobiology and Anatomy Department, University of Utah, Salt Lake City, Utah, United States of America
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Ishifune C, Tsukumo SI, Maekawa Y, Hozumi K, Chung DH, Motozono C, Yamasaki S, Nakano H, Yasutomo K. Regulation of membrane phospholipid asymmetry by Notch-mediated flippase expression controls the number of intraepithelial TCRαβ+CD8αα+ T cells. PLoS Biol 2019; 17:e3000262. [PMID: 31071093 PMCID: PMC6529014 DOI: 10.1371/journal.pbio.3000262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 05/21/2019] [Accepted: 04/25/2019] [Indexed: 01/21/2023] Open
Abstract
Intestinal intraepithelial lymphocytes (IELs) expressing CD8αα on αβ T cells (TCRαβ+CD8αα+ IELs) have suppressive capabilities in enterocolitis, but the mechanism that maintains homeostasis and cell number is not fully understood. Here, we demonstrated that the number of TCRαβ+CD8αα+ IELs was severely reduced in mice lacking recombination signal binding protein for immunoglobulin kappa J region (Rbpj) or Notch1 and Notch2 in T cells. Rbpj-deficient TCRαβ+CD8αα+ IELs expressed low levels of Atp8a2, which encodes a protein with flippase activity that regulates phospholipid asymmetry of plasma membrane such as flipping phosphatidylserine in the inner leaflet of plasma membrane. Rbpj-deficient TCRαβ+CD8αα+ IELs cannot maintain phosphatidylserine in the inner leaflet of the plasma membrane. Furthermore, depletion of intestinal macrophages restored TCRαβ+CD8αα+ IELs in Rbpj-deficient mice, suggesting that exposure of phosphatidylserine on the plasma membrane in Rbpj-deficient TCRαβ+CD8αα+ IELs acts as an “eat-me” signal. Together, these results revealed that Notch–Atp8a2 is a fundamental regulator for IELs and highlighted that membrane phospholipid asymmetry controlled by Notch-mediated flippase expression is a critical determinant in setting or balancing the number of TCRαβ+CD8αα+ IELs. Plasma membrane phospholipid asymmetry, mediated by the Notch-regulated flippase Atp8a2, is necessary for intestinal intraepithelial lymphocytes to escape engulfment by macrophages.
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Affiliation(s)
- Chieko Ishifune
- Department of Immunology and Parasitology, Graduate School of Medicine, Tokushima University, Tokushima, Japan
| | - Shin-ichi Tsukumo
- Department of Immunology and Parasitology, Graduate School of Medicine, Tokushima University, Tokushima, Japan
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
| | - Yoichi Maekawa
- Department of Parasitology and Infectious Diseases, Gifu University Graduate School of Medicine, Gifu, Japan
- Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu, Japan
| | - Katsuto Hozumi
- Department of Immunology, Tokai University School of Medicine, Isehara, Kanagawa, Japan
| | - Doo Hyun Chung
- Department of Pathology, Seoul National University College of Medicine, Seoul, Korea
| | - Chihiro Motozono
- Department of Molecular Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Sho Yamasaki
- Department of Molecular Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
- Department of Molecular Immunology, Immunology Frontier Research Center, Osaka University, Osaka, Japan
| | - Hiroyasu Nakano
- Department of Biochemistry, School of Medicine, Toho University, Tokyo, Japan
| | - Koji Yasutomo
- Department of Immunology and Parasitology, Graduate School of Medicine, Tokushima University, Tokushima, Japan
- Department of Interdisciplinary Researches for Medicine and Photonics, Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
- The Research Cluster program on Immunological diseases, Tokushima University, Tokushima, Japan
- * E-mail:
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20
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Liu W, Li R, Yin J, Guo S, Chen Y, Fan H, Li G, Li Z, Li X, Zhang X, He X, Duan C. Mesenchymal stem cells alleviate the early brain injury of subarachnoid hemorrhage partly by suppression of Notch1-dependent neuroinflammation: involvement of Botch. J Neuroinflammation 2019; 16:8. [PMID: 30646897 PMCID: PMC6334441 DOI: 10.1186/s12974-019-1396-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2018] [Accepted: 01/02/2019] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Activated microglia-mediated neuroinflammation has been regarded as an underlying key player in the pathogenesis of subarachnoid hemorrhage (SAH)-induced early brain injury (EBI). The therapeutic potential of bone marrow mesenchymal stem cells (BMSCs) transplantation has been demonstrated in several brain injury models and is thought to involve modulation of the inflammatory response. The present study investigated the salutary effects of BMSCs on EBI after SAH and the potential mechanism mediated by Notch1 signaling pathway inhibition. METHODS The Sprague-Dawley rats SAH model was induced by endovascular perforation method. BMSCs (3 × 106 cells) were transplanted intravenously into rats, and N-[N-(3,5-difluorophenacetyl-L-alanyl)]-S-phenylglycine t-butyl ester (DAPT), a Notch1 activation inhibitor, and Notch1 small interfering RNA (siRNA) were injected intracerebroventricularly. The effects of BMSCs on EBI were assayed by neurological score, brain water content (BWC), blood-brain barrier (BBB) permeability, magnetic resonance imaging, hematoxylin and eosin staining, and Fluoro-Jade C staining. Immunofluorescence and immunohistochemistry staining, Western blotting, and quantitative real-time polymerase chain reaction were used to analyze various proteins and transcript levels. Pro-inflammatory cytokines were measured by enzyme-linked immunosorbent assay. RESULTS BMSCs treatment mitigated the neurobehavioral dysfunction, BWC and BBB disruption associated with EBI after SAH, reduced ionized calcium binding adapter molecule 1 and cluster of differentiation 68 staining and interleukin (IL)-1 beta, IL-6 and tumor necrosis factor alpha expression in the left hemisphere but concurrently increased IL-10 expression. DAPT or Notch1 siRNA administration reduced Notch1 signaling pathway activation following SAH, ameliorated neurobehavioral impairments, and BBB disruption; increased BWC and neuronal degeneration; and inhibited activation of microglia and production of pro-inflammatory factors. The augmentation of Notch1 signal pathway agents and phosphorylation of nuclear factor-κB after SAH were suppressed by BMSCs but the levels of Botch were upregulated in the ipsilateral hemisphere. Botch knockdown in BMSCs abrogated the protective effects of BMSCs treatment on EBI and the suppressive effects of BMSCs on Notch1 expression. CONCLUSIONS BMSCs treatment alleviated neurobehavioral impairments and the inflammatory response in EBI after SAH; these effects may be attributed to Botch upregulation in brain tissue, which subsequently inhibited the Notch1 signaling pathway.
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Affiliation(s)
- Wenchao Liu
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Ran Li
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Jian Yin
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Shenquan Guo
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Yunchang Chen
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Haiyan Fan
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Gancheng Li
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Zhenjun Li
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Xifeng Li
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Xin Zhang
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Xuying He
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
| | - Chuanzhi Duan
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, The National Key Clinical Specialty, The Engineering Technology Research Center of Education Ministry of China, Guangdong Provincial Key Laboratory on Brain Function Repair and Regeneration, Guangzhou, 510282 China
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21
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Hong M, He J, Li S. SNW1 regulates Notch signaling in neuroblastoma through interacting with RBPJ. Biochem Biophys Res Commun 2019; 509:869-876. [PMID: 30642633 DOI: 10.1016/j.bbrc.2019.01.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 01/07/2019] [Indexed: 01/20/2023]
Abstract
The Notch signaling pathway is highly conserved, involved in cell-cell communication, and essential for multicellular organism development. The recombination signal binding protein for immunoglobulin kappa J region (RBPJ) transcriptional regulator plays a vital role in Notch signaling. When not complexed with Notch proteins, RBPJ acts as a transcriptional repressor. However, when bound to the Notch intracellular domain (NOTCH ICD) in the nucleus, RBPJ activates the transcription of Notch target genes. However, the role of RBPJ in the Notch signaling pathway in neuroblastoma (NB) remains unclear. In this study, we show that SNW domain containing 1 (SNW1) acts as a novel RBPJ partner and regulates the expression of Notch target genes. Additionally, we show that silencing RBPJ expression can prevent SNW1-mediated Notch gene expression. Public datasets and clinical NB tissues indicate that RBPJ and SNW1 are upregulated in NB, and are associated with unfavorable patient outcomes. Taken together, our results highlight that SNW1 interacts with RBPJ to regulate the Notch signaling pathway and presents a potential therapeutic target for NB.
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Affiliation(s)
- Mei Hong
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jing He
- Institute of Hematology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shiwang Li
- Department of Pediatric Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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22
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Kim GS, Park HS, Lee YC. OPTHiS Identifies the Molecular Basis of the Direct Interaction between CSL and SMRT Corepressor. Mol Cells 2018; 41:842-852. [PMID: 30157580 PMCID: PMC6182220 DOI: 10.14348/molcells.2018.0196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 06/18/2018] [Accepted: 07/19/2018] [Indexed: 01/17/2023] Open
Abstract
Notch signaling is an evolutionarily conserved pathway and involves in the regulation of various cellular and developmental processes. Ligand binding releases the intracellular domain of Notch receptor (NICD), which interacts with DNA-bound CSL [CBF1/Su(H)/Lag-1] to activate transcription of target genes. In the absence of NICD binding, CSL down-regulates target gene expression through the recruitment of various corepressor proteins including SMRT/NCoR (silencing mediator of retinoid and thyroid receptors/nuclear receptor corepressor), SHARP (SMRT/HDAC1-associated repressor protein), and KyoT2. Structural and functional studies revealed the molecular basis of these interactions, in which NICD coactivator and corepressor proteins competitively bind to β-trefoil domain (BTD) of CSL using a conserved ϕWϕP motif (ϕ denotes any hydrophobic residues). To date, there are conflicting ideas regarding the molecular mechanism of SMRT-mediated repression of CSL as to whether CSL-SMRT interaction is direct or indirect (via the bridge factor SHARP). To solve this issue, we mapped the CSL-binding region of SMRT and employed a 'one- plus two-hybrid system' to obtain CSL interaction-defective mutants for this region. We identified the CSL-interaction module of SMRT (CIMS; amino acid 1816-1846) as the molecular determinant of its direct interaction with CSL. Notably, CIMS contains a canonical ϕWϕP sequence (APIWRP, amino acids 1832-1837) and directly interacts with CSL-BTD in a mode similar to other BTD-binding corepressors. Finally, we showed that CSL-interaction motif, rather than SHARP-interaction motif, of SMRT is involved in transcriptional repression of NICD in a cell-based assay. These results strongly suggest that SMRT participates in CSL-mediated repression via direct binding to CSL.
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Affiliation(s)
- Gwang Sik Kim
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186,
Korea
| | - Hee-Sae Park
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186,
Korea
| | - Young Chul Lee
- School of Biological Sciences and Technology, Chonnam National University, Gwangju 61186,
Korea
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23
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Yuan Z, Xiu C, Song K, Pei R, Miao S, Mao X, Sun J, Jia S. Long non-coding RNA AFAP1-AS1/miR-320a/RBPJ axis regulates laryngeal carcinoma cell stemness and chemoresistance. J Cell Mol Med 2018; 22:4253-4262. [PMID: 29971915 PMCID: PMC6111816 DOI: 10.1111/jcmm.13707] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/17/2018] [Indexed: 01/04/2023] Open
Abstract
AFAP1-AS1 is a long non-coding RNA that is associated with tumorigenesis and poor prognosis in a variety of cancers. We have been suggested that AFAP1-AS1 increases tumorigenesis in laryngeal carcinoma specifically by enhancing stemness and chemoresistance. We assessed AFAP1-AS1 expression in human laryngeal specimens, paired adjacent normal tissues and human HEp-2 cells. Indeed, we found not only that AFAP1-AS1 was up-regulated in laryngeal carcinoma specimens and cells, but also that stemness-associated genes were overexpressed. Silencing of AFAP1-AS1 promoted HEp-2 cell chemoresistance under cisplatin treatment. Expression of AFAP1-AS1 was increased in drug-resistant Hep-2 cells. We then probed the mechanism of AFAP1-AS1 activity and determined that miR-320a was a potential molecular target of AFAP1-AS1. Luciferase reporter and qRT-PCR assays of AFAP1-AS1 and miR-320a levels in human specimens and cell cultures indicated that AFAP1-AS1 negatively regulates miR-320a. To discover the molecular mechanism of miR-320a, we again used the DIANA Tools algorithm to predict its genetic target, RBPJ. After cloning the 3'-untranslated regions (3'-UTR) of RBPJ into a luciferase reporter, we determined that miR-320a did in fact reduce RBPJ mRNA and protein levels. Ultimately, we determined that AFAP1-AS1 increases RBPJ expression by negatively regulating miR-320a and RBPJ overexpression rescues stemness and chemoresistance inhibited by AFAP1-AS1 silencing. Taken together, these results suggest that AFAP1-AS1 can serve as a prognostic biomarker in laryngeal carcinoma and that miR-320a has the potential to improve standard therapeutic approaches to the disease, especially for cases in which cancer cell stemness and drug resistance present significant barriers to effective treatment.
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Affiliation(s)
- Zhennan Yuan
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Cheng Xiu
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Kaibin Song
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Rong Pei
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Susheng Miao
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Xionghui Mao
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Ji Sun
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
| | - Shenshan Jia
- Department of Head and Neck SurgeryHarbin Medical University Cancer HospitalHarbinChina
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24
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Zhang RZ, Zeng XH, Lin ZF, Ming-Fu, Tong YL, Lui VCH, Tam PKH, Lamb JR, Xia HM, Chen Y. Downregulation of Hes1 expression in experimental biliary atresia and its effects on bile duct structure. World J Gastroenterol 2018; 24:3260-3272. [PMID: 30090006 PMCID: PMC6079292 DOI: 10.3748/wjg.v24.i29.3260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Revised: 06/03/2018] [Accepted: 06/25/2018] [Indexed: 02/06/2023] Open
Abstract
AIM To analyze the expression and function of the Notch signaling target gene Hes1 in a rhesus rotavirus-induced mouse biliary atresia model.
METHODS The morphologies of biliary epithelial cells in biliary atresia patients and in a mouse model were examined by immunohistochemical staining. Then, the differential expression of Notch signaling pathway-related molecules was investigated. Further, the effects of the siRNA-mediated inhibition of Hes1 expression were examined using a biliary epithelial cell 3D culture system.
RESULTS Both immature (EpCAM+) and mature (CK19+) biliary epithelial cells were detected in the livers of biliary atresia patients without a ductile structure and in the mouse model with a distorted bile duct structure. The hepatic expression of transcripts for most Notch signaling molecules were significantly reduced on day 7 but recovered to normal levels by day 14, except for the target molecule Hes1, which still exhibited lower mRNA and protein levels. Expression of the Hes1 transcriptional co-regulator, RBP-Jκ was also reduced. A 3D gel culture system promoted the maturation of immature biliary epithelial cells, with increased expression of CK19+ cells and the formation of a duct-like structure. The administration of Hes1 siRNA blocked this process. As a result, the cells remained in an immature state, and no duct-like structure was observed.
CONCLUSION Our data indicated that Hes1 might contribute to the maturation and the cellular structure organization of biliary epithelial cells, which provides new insight into understanding the pathology of biliary atresia.
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Affiliation(s)
- Rui-Zhong Zhang
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Xin-Hao Zeng
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Ze-Feng Lin
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Ming-Fu
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Yan-Lu Tong
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Vincent CH Lui
- Department of Surgery and Pathology, University of Hong Kong, Hong Kong, China
| | - Paul KH Tam
- Department of Surgery and Pathology, University of Hong Kong, Hong Kong, China
| | - Jonathan R Lamb
- Department of Life Sciences, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Hui-Min Xia
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
| | - Yan Chen
- Department of Pediatric Surgery, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, Guangdong Province, China
- Department of Surgery and Pathology, University of Hong Kong, Hong Kong, China
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25
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Goruppi S, Procopio MG, Jo S, Clocchiatti A, Neel V, Dotto GP. The ULK3 Kinase Is Critical for Convergent Control of Cancer-Associated Fibroblast Activation by CSL and GLI. Cell Rep 2018; 20:2468-2479. [PMID: 28877478 DOI: 10.1016/j.celrep.2017.08.048] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 06/15/2017] [Accepted: 08/15/2017] [Indexed: 12/11/2022] Open
Abstract
The connection between signaling pathways activating cancer-associated fibroblasts (CAFs) remains to be determined. Metabolic alterations linked to autophagy have also been implicated in CAF activation. CSL/RBPJ, a transcriptional repressor that mediates Notch signaling, suppresses the gene expression program(s), leading to stromal senescence and CAF activation. Deregulated GLI signaling can also contribute to CAF conversion. Here, we report that compromised CSL function depends on GLI activation for conversion of human dermal fibroblasts into CAFs, separately from cellular senescence. Decreased CSL upregulates the expression of the ULK3 kinase, which binds and activates GLI2. Increased ULK3 also induces autophagy, which is unlinked from GLI and CAF activation. ULK3 upregulation occurs in the CAFs of several tumor types, and ULK3 silencing suppresses the tumor-enhancing properties of these cells. Thus, ULK3 links two key signaling pathways involved in CAF conversion and is an attractive target for stroma-focused anti-cancer intervention.
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Affiliation(s)
- Sandro Goruppi
- Cutaneous Biology Research Center, Massachusetts General Hospital, 149 Bldg., 13th St. Charlestown, MA 02129, USA; Department of Dermatology, Harvard Medical School, Boston, MA 02125, USA
| | - Maria-Giuseppina Procopio
- Department of Biochemistry, University of Lausanne, 155 Chemin des Boveresses, Epalinges 1066, Switzerland
| | - Seunghee Jo
- Cutaneous Biology Research Center, Massachusetts General Hospital, 149 Bldg., 13th St. Charlestown, MA 02129, USA; Department of Dermatology, Harvard Medical School, Boston, MA 02125, USA
| | - Andrea Clocchiatti
- Cutaneous Biology Research Center, Massachusetts General Hospital, 149 Bldg., 13th St. Charlestown, MA 02129, USA; Department of Dermatology, Harvard Medical School, Boston, MA 02125, USA
| | - Victor Neel
- Department of Dermatology, Massachusetts General Hospital, Boston, MA 02114, USA
| | - G Paolo Dotto
- Cutaneous Biology Research Center, Massachusetts General Hospital, 149 Bldg., 13th St. Charlestown, MA 02129, USA; Department of Biochemistry, University of Lausanne, 155 Chemin des Boveresses, Epalinges 1066, Switzerland.
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26
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Duarte S, Woll PS, Buza-Vidas N, Chin DWL, Boukarabila H, Luís TC, Stenson L, Bouriez-Jones T, Ferry H, Mead AJ, Atkinson D, Jin S, Clark SA, Wu B, Repapi E, Gray N, Taylor S, Mutvei AP, Tsoi YL, Nerlov C, Lendahl U, Jacobsen SEW. Canonical Notch signaling is dispensable for adult steady-state and stress myelo-erythropoiesis. Blood 2018; 131:1712-1719. [PMID: 29339402 PMCID: PMC5909886 DOI: 10.1182/blood-2017-06-788505] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 01/10/2018] [Indexed: 12/21/2022] Open
Abstract
Although an essential role for canonical Notch signaling in generation of hematopoietic stem cells in the embryo and in thymic T-cell development is well established, its role in adult bone marrow (BM) myelopoiesis remains unclear. Some studies, analyzing myeloid progenitors in adult mice with inhibited Notch signaling, implicated distinct roles of canonical Notch signaling in regulation of progenitors for the megakaryocyte, erythroid, and granulocyte-macrophage cell lineages. However, these studies might also have targeted other pathways. Therefore, we specifically deleted, in adult BM, the transcription factor recombination signal-binding protein J κ (Rbpj), through which canonical signaling from all Notch receptors converges. Notably, detailed progenitor staging established that canonical Notch signaling is fully dispensable for all investigated stages of megakaryocyte, erythroid, and myeloid progenitors in steady state unperturbed hematopoiesis, after competitive BM transplantation, and in stress-induced erythropoiesis. Moreover, expression of key regulators of these hematopoietic lineages and Notch target genes were unaffected by Rbpj deficiency in BM progenitor cells.
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Affiliation(s)
- Sara Duarte
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- Clinical Hematology Department, University Hospital Center of Coimbra, Praceta Professor Mota Pinto, Coimbra, Portugal
| | - Petter S Woll
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- Center for Hematology and Regenerative Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Natalija Buza-Vidas
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Desmond Wai Loon Chin
- Center for Hematology and Regenerative Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Hanane Boukarabila
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Tiago C Luís
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Laura Stenson
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Tiphaine Bouriez-Jones
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Helen Ferry
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Adam J Mead
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Deborah Atkinson
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Shaobo Jin
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden; and
| | - Sally-Ann Clark
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Bishan Wu
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Emmanouela Repapi
- Computational Biology Research Group, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Nicki Gray
- Computational Biology Research Group, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Stephen Taylor
- Computational Biology Research Group, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Anders P Mutvei
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden; and
| | - Yat Long Tsoi
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden; and
| | - Claus Nerlov
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Urban Lendahl
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden; and
| | - Sten Eirik W Jacobsen
- Haematopoietic Stem Cell Biology Laboratory, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- Center for Hematology and Regenerative Medicine, Department of Medicine Huddinge, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden; and
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27
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Prasasya RD, Mayo KE. Notch Signaling Regulates Differentiation and Steroidogenesis in Female Mouse Ovarian Granulosa Cells. Endocrinology 2018; 159:184-198. [PMID: 29126263 PMCID: PMC5761600 DOI: 10.1210/en.2017-00677] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 11/02/2017] [Indexed: 01/04/2023]
Abstract
The Notch pathway is a highly conserved juxtacrine signaling mechanism that is important for many cellular processes during development, including differentiation and proliferation. Although Notch is important during ovarian follicle formation and early development, its functions during the gonadotropin-dependent stages of follicle development are largely unexplored. We observed positive regulation of Notch activity and expression of Notch ligands and receptors following activation of the luteinizing hormone-receptor in prepubertal mouse ovary. JAG1, the most abundantly expressed Notch ligand in mouse ovary, revealed a striking shift in localization from oocytes to somatic cells following hormone stimulation. Using primary cultures of granulosa cells, we investigated the functions of Jag1 using small interfering RNA knockdown. The loss of JAG1 led to suppression of granulosa cell differentiation as marked by reduced expression of enzymes and factors involved in steroid biosynthesis, and in steroid secretion. Jag1 knockdown also resulted in enhanced cell proliferation. These phenotypes were replicated, although less robustly, following knockdown of the obligate canonical Notch transcription factor RBPJ. Intracellular signaling analysis revealed increased activation of the mitogenic phosphatidylinositol 3-kinase/protein kinase B and mitogen-activated protein kinase/extracellular signal-regulated kinase pathways following Notch knockdown, with a mitogen-activated protein kinase kinase inhibitor blocking the enhanced proliferation observed in Jag1 knockdown granulosa cells. Activation of YB-1, a known regulator of granulosa cell differentiation genes, was suppressed by Jag1 knockdown. Overall, this study reveals a role of Notch signaling in promoting the differentiation of preovulatory granulosa cells, adding to the diverse functions of Notch in the mammalian ovary.
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MESH Headings
- Animals
- Cell Differentiation/drug effects
- Cell Proliferation/drug effects
- Cells, Cultured
- Chorionic Gonadotropin/pharmacology
- Estradiol/metabolism
- Female
- Gene Expression Regulation, Developmental/drug effects
- Genes, Reporter/drug effects
- Gonadotropins, Equine/pharmacology
- Granulosa Cells/cytology
- Granulosa Cells/drug effects
- Granulosa Cells/metabolism
- Green Fluorescent Proteins/genetics
- Green Fluorescent Proteins/metabolism
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/antagonists & inhibitors
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/genetics
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/metabolism
- Jagged-1 Protein/antagonists & inhibitors
- Jagged-1 Protein/genetics
- Jagged-1 Protein/metabolism
- MAP Kinase Signaling System/drug effects
- Mice, Inbred Strains
- Mice, Transgenic
- Progesterone/metabolism
- RNA Interference
- Receptor, Notch2/agonists
- Receptor, Notch2/genetics
- Receptor, Notch2/metabolism
- Receptor, Notch3/agonists
- Receptor, Notch3/genetics
- Receptor, Notch3/metabolism
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
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Affiliation(s)
- Rexxi D. Prasasya
- Department of Molecular Biosciences and Center for Reproductive Science, Northwestern University, Evanston, Illinois 60208
| | - Kelly E. Mayo
- Department of Molecular Biosciences and Center for Reproductive Science, Northwestern University, Evanston, Illinois 60208
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28
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Gong C, Li L, Qin C, Wu W, Liu Q, Li Y, Gan L, Ou S. The Involvement of Notch1-RBP-Jk/Msx2 Signaling Pathway in Aortic Calcification of Diabetic Nephropathy Rats. J Diabetes Res 2017; 2017:8968523. [PMID: 29464183 PMCID: PMC5804331 DOI: 10.1155/2017/8968523] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 09/27/2017] [Accepted: 10/26/2017] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND This study explored the changes in expression of vascular smooth muscle cell (VSMC) markers and osteogenic markers, as well as the involvement of Notch1-RBP-Jk/Msx2 pathway in a rat model of diabetic nephropathy (DN) with vascular calcification. METHODS A rat model of DN with concomitant vascular calcification was created by intraperitoneal injection of streptozotocin followed by administration of vitamin D3 and nicotine. Biochemical analysis and histological examination of aortic tissue were performed. VSMC markers and osteogenic markers as well as target molecules in Notch1-RBP-Jk/Msx2 were determined by quantitative real-time polymerase chain reaction and immunohistochemical analysis. RESULTS Serum calcium and phosphorus levels were significantly increased in model rats as compared to that in normal controls. Diabetic rats with vascular calcification exhibited mineral deposits in aortic intima-media accompanied by decreased expression of VSMC markers and increased expression of osteogenic markers. Notch1, RBP-Jk, Msx2, Jagged1, and N1-ICD were barely expressed in the aortic wall of normal rats. In contrast, these were significantly increased in the model group at all time points (8, 12, and 16 weeks), as compared to that in the normal rats. CONCLUSION Activation of the Notch1-RBP-Jk/Msx2 signaling pathway may be involved in the development and progression of vascular calcification in DN.
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Affiliation(s)
- Caipan Gong
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Li Li
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Chunmei Qin
- Department of Nephrology, Luzhou People's Hospital, Luzhou, Sichuan 646000, China
| | - Weihua Wu
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Qi Liu
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Ying Li
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Linwang Gan
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Santao Ou
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China
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29
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Xie Q, Wu Q, Kim L, Miller TE, Liau BB, Mack SC, Yang K, Factor DC, Fang X, Huang Z, Zhou W, Alazem K, Wang X, Bernstein BE, Bao S, Rich JN. RBPJ maintains brain tumor-initiating cells through CDK9-mediated transcriptional elongation. J Clin Invest 2016; 126:2757-72. [PMID: 27322055 DOI: 10.1172/jci86114] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 04/07/2016] [Indexed: 12/26/2022] Open
Abstract
Glioblastomas co-opt stem cell regulatory pathways to maintain brain tumor-initiating cells (BTICs), also known as cancer stem cells. NOTCH signaling has been a molecular target in BTICs, but NOTCH antagonists have demonstrated limited efficacy in clinical trials. Recombining binding protein suppressor of hairless (RBPJ) is considered a central transcriptional mediator of NOTCH activity. Here, we report that pharmacologic NOTCH inhibitors were less effective than targeting RBPJ in suppressing tumor growth. While NOTCH inhibitors decreased canonical NOTCH gene expression, RBPJ regulated a distinct profile of genes critical to BTIC stemness and cell cycle progression. RBPJ was preferentially expressed by BTICs and required for BTIC self-renewal and tumor growth. MYC, a key BTIC regulator, bound the RBPJ promoter and treatment with a bromodomain and extraterminal domain (BET) family bromodomain inhibitor decreased MYC and RBPJ expression. Proteomic studies demonstrated that RBPJ binds CDK9, a component of positive transcription elongation factor b (P-TEFb), to target gene promoters, enhancing transcriptional elongation. Collectively, RBPJ links MYC and transcriptional control through CDK9, providing potential nodes of fragility for therapeutic intervention, potentially distinct from NOTCH.
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30
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Just PA, Poncy A, Charawi S, Dahmani R, Traore M, Dumontet T, Drouet V, Dumont F, Gilgenkrantz H, Colnot S, Terris B, Coulouarn C, Lemaigre F, Perret C. LKB1 and Notch Pathways Interact and Control Biliary Morphogenesis. PLoS One 2015; 10:e0145400. [PMID: 26689699 PMCID: PMC4687046 DOI: 10.1371/journal.pone.0145400] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 12/03/2015] [Indexed: 12/18/2022] Open
Abstract
Background LKB1 is an evolutionary conserved kinase implicated in a wide range of cellular functions including inhibition of cell proliferation, regulation of cell polarity and metabolism. When Lkb1 is inactivated in the liver, glucose homeostasis is perturbed, cellular polarity is affected and cholestasis develops. Cholestasis occurs as a result from deficient bile duct development, yet how LKB1 impacts on biliary morphogenesis is unknown. Methodology/Principal Findings We characterized the phenotype of mice in which deletion of the Lkb1 gene has been specifically targeted to the hepatoblasts. Our results confirmed that lack of LKB1 in the liver results in bile duct paucity leading to cholestasis. Immunostaining analysis at a prenatal stage showed that LKB1 is not required for differentiation of hepatoblasts to cholangiocyte precursors but promotes maturation of the primitive ductal structures to mature bile ducts. This phenotype is similar to that obtained upon inactivation of Notch signaling in the liver. We tested the hypothesis of a functional overlap between the LKB1 and Notch pathways by gene expression profiling of livers deficient in Lkb1 or in the Notch mediator RbpJκ and identified a mutual cross-talk between LKB1 and Notch signaling. In vitro experiments confirmed that Notch activity was deficient upon LKB1 loss. Conclusion LKB1 and Notch share a common genetic program in the liver, and regulate bile duct morphogenesis.
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Affiliation(s)
- Pierre-Alexandre Just
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
- APHP, Hôpitaux Universitaires Paris Centre, Hôpital Cochin, Pathology department, F-75014 Paris, France
| | - Alexis Poncy
- de Duve Institute and Université catholique de Louvain, B-1200 Brussels, Belgium
| | - Sara Charawi
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Rajae Dahmani
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Massiré Traore
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Typhanie Dumontet
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Valérie Drouet
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Florent Dumont
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
| | - Hélène Gilgenkrantz
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Sabine Colnot
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
| | - Benoit Terris
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
- APHP, Hôpitaux Universitaires Paris Centre, Hôpital Cochin, Pathology department, F-75014 Paris, France
| | | | - Frédéric Lemaigre
- de Duve Institute and Université catholique de Louvain, B-1200 Brussels, Belgium
| | - Christine Perret
- INSERM, U1016, Institut Cochin, F-75014 Paris, France
- CNRS, UMR8104, F-75014 Paris, France
- Université Paris Descartes, F-75014 Paris, France
- Equipe labellisée LNCC Paris, Paris, France
- * E-mail:
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31
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Giachino C, Boulay JL, Ivanek R, Alvarado A, Tostado C, Lugert S, Tchorz J, Coban M, Mariani L, Bettler B, Lathia J, Frank S, Pfister S, Kool M, Taylor V. A Tumor Suppressor Function for Notch Signaling in Forebrain Tumor Subtypes. Cancer Cell 2015; 28:730-742. [PMID: 26669487 DOI: 10.1016/j.ccell.2015.10.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 08/06/2015] [Accepted: 10/16/2015] [Indexed: 11/18/2022]
Abstract
In the brain, Notch signaling maintains normal neural stem cells, but also brain cancer stem cells, indicating an oncogenic role. Here, we identify an unexpected tumor suppressor function for Notch in forebrain tumor subtypes. Genetic inactivation of RBP-Jκ, a key Notch mediator, or Notch1 and Notch2 receptors accelerates PDGF-driven glioma growth in mice. Conversely, genetic activation of the Notch pathway reduces glioma growth and increases survival. In humans, high Notch activity strongly correlates with distinct glioma subtypes, increased patient survival, and lower tumor grade. Additionally, simultaneous inactivation of RBP-Jκ and p53 induces primitive neuroectodermal-like tumors in mice. Hence, Notch signaling cooperates with p53 to restrict cell proliferation and tumor growth in mouse models of human brain tumors.
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MESH Headings
- Animals
- Basic Helix-Loop-Helix Transcription Factors/genetics
- Basic Helix-Loop-Helix Transcription Factors/metabolism
- Brain Neoplasms/genetics
- Brain Neoplasms/metabolism
- Brain Neoplasms/mortality
- Brain Neoplasms/pathology
- Cell Proliferation
- Databases, Genetic
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Gene Transfer Techniques
- Glioma/genetics
- Glioma/metabolism
- Glioma/mortality
- Glioma/pathology
- Humans
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/genetics
- Immunoglobulin J Recombination Signal Sequence-Binding Protein/metabolism
- Infusions, Intraventricular
- Kaplan-Meier Estimate
- Mice, Knockout
- Neoplasm Grading
- Neoplastic Stem Cells/metabolism
- Neoplastic Stem Cells/pathology
- Neural Stem Cells/metabolism
- Neural Stem Cells/pathology
- Phenotype
- Platelet-Derived Growth Factor/administration & dosage
- Prosencephalon/metabolism
- Prosencephalon/pathology
- Proto-Oncogene Proteins c-sis/genetics
- Proto-Oncogene Proteins c-sis/metabolism
- Receptor, Notch1/genetics
- Receptor, Notch1/metabolism
- Receptor, Notch2/genetics
- Receptor, Notch2/metabolism
- Receptors, Notch/genetics
- Receptors, Notch/metabolism
- Recombinant Proteins/administration & dosage
- Repressor Proteins/genetics
- Repressor Proteins/metabolism
- Signal Transduction
- Time Factors
- Tumor Burden
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism
- Tumor Suppressor Proteins/genetics
- Tumor Suppressor Proteins/metabolism
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Affiliation(s)
- Claudio Giachino
- Department of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland.
| | - Jean-Louis Boulay
- Department of Biomedicine, University Hospital Basel, Spitalstrasse 21, 4031 Basel, Switzerland
| | - Robert Ivanek
- Department of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland
| | - Alvaro Alvarado
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, NC 10, Cleveland, OH 44195, USA
| | - Cristobal Tostado
- Department of Biomedicine, University Hospital Basel, Spitalstrasse 21, 4031 Basel, Switzerland
| | - Sebastian Lugert
- Department of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland
| | - Jan Tchorz
- Department of Biomedicine, University of Basel, Kingelbergstrasse 50-70, 4056 Basel, Switzerland
| | - Mustafa Coban
- Department of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland
| | - Luigi Mariani
- Department of Biomedicine, University Hospital Basel, Spitalstrasse 21, 4031 Basel, Switzerland
| | - Bernhard Bettler
- Department of Biomedicine, University of Basel, Kingelbergstrasse 50-70, 4056 Basel, Switzerland
| | - Justin Lathia
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Avenue, NC 10, Cleveland, OH 44195, USA
| | - Stephan Frank
- Division of Neuropathology, Institute of Pathology, University of Basel, Schoenbeinstrasse 40, 4031 Basel, Switzerland
| | - Stefan Pfister
- Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ), 69121 Heidelberg, Germany
| | - Marcel Kool
- Division of Pediatric Neurooncology, German Cancer Research Center (DKFZ), 69121 Heidelberg, Germany
| | - Verdon Taylor
- Department of Biomedicine, University of Basel, Mattenstrasse 28, 4058 Basel, Switzerland.
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32
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Sherry KP, Johnson SE, Hatem CL, Majumdar A, Barrick D. Effects of Linker Length and Transient Secondary Structure Elements in the Intrinsically Disordered Notch RAM Region on Notch Signaling. J Mol Biol 2015; 427:3587-3597. [PMID: 26344835 DOI: 10.1016/j.jmb.2015.09.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 08/26/2015] [Accepted: 09/02/2015] [Indexed: 12/14/2022]
Abstract
Formation of the bivalent interaction between the Notch intracellular domain (NICD) and the transcription factor CBF-1/RBP-j, Su(H), Lag-1 (CSL) is a key event in Notch signaling because it switches Notch-responsive genes from a repressed state to an activated state. Interaction of the intrinsically disordered RBP-j-associated molecule (RAM) region of NICD with CSL is thought to both disrupt binding of corepressor proteins to CSL and anchor NICD to CSL, promoting interaction of the ankyrin domain of NICD with CSL through an effective concentration mechanism. To quantify the role of disorder in the RAM linker region on the effective concentration enhancement of Notch transcriptional activation, we measured the effects of linker length variation on activation. The resulting activation profile has general features of a worm-like chain model for effective concentration. However, deviations from the model for short sequence deletions suggest that RAM contains sequence-specific structural elements that may be important for activation. Structural characterization of the RAM linker with sedimentation velocity analytical ultracentrifugation and NMR spectroscopy reveals that the linker is compact and contains three transient helices and two extended and dynamic regions. To test if these secondary structure elements are important for activation, we made sequence substitutions to change the secondary structure propensities of these elements and measured transcriptional activation of the resulting variants. Substitutions to two of these nonrandom elements (helix 2, extended region 1) have effects on activation, but these effects do not depend on the nature of the substituting residues. Thus, the primary sequences of these elements, but not their secondary structures, are influencing signaling.
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Affiliation(s)
- Kathryn P Sherry
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Scott E Johnson
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Christine L Hatem
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Ananya Majumdar
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Doug Barrick
- T. C. Jenkins Department of Biophysics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.
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33
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Baek HJ, Yoon JH, Ann EJ, Kim MY, Ahn JS, Kim SH, Jo EH, Lee HJ, Park HS. Alpha-synuclein negatively regulates Notch1 intracellular domain protein stability through promoting interaction with Fbw7. Neurosci Lett 2015; 600:6-11. [PMID: 26033182 DOI: 10.1016/j.neulet.2015.05.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 05/19/2015] [Accepted: 05/22/2015] [Indexed: 01/27/2023]
Abstract
Notch signaling pathway is well known that it is involved in regulating cell fate, proliferation and homeostasis. In this study, we show a novel function of alpha-synuclein (SNCA) to promote degradation of Notch1 intracellular domain (Notch1-IC) through Fbw7, ubiquitin E3 ligase. We identified that SNCA inhibits Notch1 transcription activity and diminishes the interaction between Notch1-IC and RBP-Jk. We also found decrease of Notch1-IC protein stability by exogenous and endogenous SNCA through proteasomal pathway, not through lysosomal pathway. And, we found that SNCA promotes interaction between Notch1-IC and Fbw7. Furthermore, SNCA directly interacts with Fbw7. SNCA increases ubiquitination of Notch-IC by Fbw7 through interaction with Fbw7. Together, these results suggest that SNCA is a novel regulator of Notch1-IC transcriptional activity with acting as an enhancer of the interaction of Notch1-IC and Fbw7 with increasing degradation of Notch1-IC.
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Affiliation(s)
- Hyeong-Jin Baek
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Ji-Hye Yoon
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Eun-Jung Ann
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Mi-Yeon Kim
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Ji-Seon Ahn
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Seol-Hee Kim
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Eun-Hye Jo
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Hye-Jin Lee
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea
| | - Hee-Sae Park
- Hormone Research Center, School of Biological Sciences and Technology, Chonnam National University, Gwangju, Republic of Korea.
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Tian Y, Xu Y, Fu Q, Chang M, Wang Y, Shang X, Wan C, Marymont JV, Dong Y. Notch inhibits chondrogenic differentiation of mesenchymal progenitor cells by targeting Twist1. Mol Cell Endocrinol 2015; 403:30-8. [PMID: 25596548 PMCID: PMC4337804 DOI: 10.1016/j.mce.2015.01.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 12/15/2014] [Accepted: 01/11/2015] [Indexed: 12/14/2022]
Abstract
While Notch signaling plays a critical role in the regulation of cartilage formation, its downstream targets are unknown. To address this we performed gain and losses of function experiments and demonstrate that Notch inhibition of chondrogenesis acts via up-regulation of the transcription factor Twist1. Upon Notch activation, murine limb bud mesenchymal progenitor cells in micromass culture displayed an inhibition of chondrogenesis. Twist1 was found to be exclusively expressed in mesenchymal progenitor cells at the onset stage of chondrogenesis during Notch activation. Inhibition of Notch signaling in these cells significantly reduced protein expression of Twist1. Furthermore, the inhibition effect of NICD1 on MPC chondrogenesis was markedly reduced by knocking down of Twist1. Constitutively active Notch signaling significantly enhanced Twist1 promoter activity; whereas mutation studies indicated that a putative NICD/RBPjK binding element in the promoter region is required for the Notch-responsiveness of the Twist1 promoter. Finally, chromatin immunoprecipitation assays further confirmed that the Notch intracellular domain influences Twist1 by directly binding to the Twist1 promoter. These data provide a novel insight into understanding the molecular mechanisms behind Notch inhibition of the onset of chondrogenesis.
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Affiliation(s)
- Ye Tian
- Department of Orthopaedics, Shengjing Hospital, China Medical University, 36 Sanhao Road, Shenyang 110004, China.
| | - Ying Xu
- Department of Anesthesiology, Shengjing Hospital, China Medical University, 36 Sanhao Road, Shenyang 110004, China
| | - Qin Fu
- Department of Orthopaedics, Shengjing Hospital, China Medical University, 36 Sanhao Road, Shenyang 110004, China
| | - Martin Chang
- Department of Orthopaedics and Rehabilitation, Center for Musculoskeletal Research, University of Rochester School of Medicine, 601 Elmwood Avenue, Box 665, Rochester, NY 14642, USA
| | - Yongjun Wang
- Institute of Spine, Longhua Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai 200032, China
| | - Xifu Shang
- Department of Orthopaedic Surgery, Anhui Provincial Hospital, Hefei 230001, China
| | - Chao Wan
- Ministry of Education Key Laboratory for Regenerative Medicine, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - John V Marymont
- Department of Orthopaedic Surgery, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA
| | - Yufeng Dong
- Department of Orthopaedic Surgery, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA
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Ntziachristos P, Lim JS, Sage J, Aifantis I. From fly wings to targeted cancer therapies: a centennial for notch signaling. Cancer Cell 2014; 25:318-34. [PMID: 24651013 PMCID: PMC4040351 DOI: 10.1016/j.ccr.2014.02.018] [Citation(s) in RCA: 275] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 01/21/2014] [Accepted: 02/21/2014] [Indexed: 12/21/2022]
Abstract
Since Notch phenotypes in Drosophila melanogaster were first identified 100 years ago, Notch signaling has been extensively characterized as a regulator of cell-fate decisions in a variety of organisms and tissues. However, in the past 20 years, accumulating evidence has linked alterations in the Notch pathway to tumorigenesis. In this review, we discuss the protumorigenic and tumor-suppressive functions of Notch signaling, and dissect the molecular mechanisms that underlie these functions in hematopoietic cancers and solid tumors. Finally, we link these mechanisms and observations to possible therapeutic strategies targeting the Notch pathway in human cancers.
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Affiliation(s)
- Panagiotis Ntziachristos
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA; NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA
| | - Jing Shan Lim
- Departments of Pediatrics and Genetics, Stanford University, Stanford, CA 94305, USA
| | - Julien Sage
- Departments of Pediatrics and Genetics, Stanford University, Stanford, CA 94305, USA.
| | - Iannis Aifantis
- Howard Hughes Medical Institute and Department of Pathology, NYU School of Medicine, New York, NY 10016, USA; NYU Cancer Institute and Helen L. and Martin S. Kimmel Center for Stem Cell Biology, NYU School of Medicine, New York, NY 10016, USA.
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Lake RJ, Tsai PF, Choi I, Won KJ, Fan HY. RBPJ, the major transcriptional effector of Notch signaling, remains associated with chromatin throughout mitosis, suggesting a role in mitotic bookmarking. PLoS Genet 2014; 10:e1004204. [PMID: 24603501 PMCID: PMC3945225 DOI: 10.1371/journal.pgen.1004204] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 01/13/2014] [Indexed: 01/07/2023] Open
Abstract
Mechanisms that maintain transcriptional memory through cell division are important to maintain cell identity, and sequence-specific transcription factors that remain associated with mitotic chromatin are emerging as key players in transcriptional memory propagation. Here, we show that the major transcriptional effector of Notch signaling, RBPJ, is retained on mitotic chromatin, and that this mitotic chromatin association is mediated through the direct association of RBPJ with DNA. We further demonstrate that RBPJ binds directly to nucleosomal DNA in vitro, with a preference for sites close to the entry/exit position of the nucleosomal DNA. Genome-wide analysis in the murine embryonal-carcinoma cell line F9 revealed that roughly 60% of the sites occupied by RBPJ in asynchronous cells were also occupied in mitotic cells. Among them, we found that a fraction of RBPJ occupancy sites shifted between interphase and mitosis, suggesting that RBPJ can be retained on mitotic chromatin by sliding on DNA rather than disengaging from chromatin during mitotic chromatin condensation. We propose that RBPJ can function as a mitotic bookmark, marking genes for efficient transcriptional activation or repression upon mitotic exit. Strikingly, we found that sites of RBPJ occupancy were enriched for CTCF-binding motifs in addition to RBPJ-binding motifs, and that RBPJ and CTCF interact. Given that CTCF regulates transcription and bridges long-range chromatin interactions, our results raise the intriguing hypothesis that by collaborating with CTCF, RBPJ may participate in establishing chromatin domains and/or long-range chromatin interactions that could be propagated through cell division to maintain gene expression programs. How does a cell remember what it should be after cell division? One mechanism that is beginning to emerge is the retention of a few key regulatory proteins on the highly condensed mitotic chromatin during cell division. These proteins are called mitotic bookmarks, as they are believed to offer critical information as to how genetic information should be read immediately after mitosis. We have found that a protein called RBPJ, which plays pivotal roles in regulating cell-fate choices, is retained on mitotic chromatin. RBPJ transmits to DNA signals elicited by the Notch pathway: a pathway that conveys information resulting from the communication between two adjacent cells. Unlike many other factors, we found that RBPJ can bind to nucleosomes, which are the basic unit of packaged DNA consisting of DNA wrapped around eight histone proteins. We also found that RBPJ interacts with and binds to DNA sites regulated by the CTCF protein, which plays important roles in regulating long-range DNA interactions. Together, our results suggest that RBPJ can function as a mitotic bookmarking factor, to help maintain genetic programs, higher-order structural information and consequently the memory of cell identity through cell division.
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Affiliation(s)
- Robert J. Lake
- Epigenetics Program, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Pei-Fang Tsai
- Epigenetics Program, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Inchan Choi
- Institute for Diabetes Obesity and Metabolism, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Kyoung-Jae Won
- Institute for Diabetes Obesity and Metabolism, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: (KJW); (HYF)
| | - Hua-Ying Fan
- Epigenetics Program, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Institute for Diabetes Obesity and Metabolism, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: (KJW); (HYF)
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Wang WJ, Yao Y, Jiang LL, Hu TH, Ma JQ, Liao ZJ, Yao JT, Li DF, Wang SH, Nan KJ. Knockdown of lymphoid enhancer factor 1 inhibits colon cancer progression in vitro and in vivo. PLoS One 2013; 8:e76596. [PMID: 24098538 PMCID: PMC3788715 DOI: 10.1371/journal.pone.0076596] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Accepted: 09/03/2013] [Indexed: 01/24/2023] Open
Abstract
Expression of lymphoid enhancer factor 1 (LEF1) is frequently altered in different human cancers. This study aimed to assess LEF1 expression in colon cancer tissues and to explore changed phenotypes, gene expressions, and the possible mechanism after knocked down LEF1 expression in colon cancer cell lines. A total of 106 colon cancer and matched paratumorous normal tissues were used to assess LEF1 expression using immunohistochemistry and qRT-PCR. LEF1 lentivirus was used to knockdown LEF1 expression for the assessment of cell viability, cell cycle distribution, apoptosis, and gene expressions. The nude mouse xenograft assay was performed to detect the effects of LEF1 knockdown in vivo. The data showed that the levels of LEF1 mRNA and protein were significantly increased in human colon cancer tissues compared to the matched paratumorous normal tissues and were associated with infiltration depth, lymph node and distant metastases, advanced TNM (tumor-node-metastasis) stages, and shorter overall survival. Furthermore, LEF1 knockdown reduced tumor cell viability, invasion capacity, MMP2 and MMP-9 expression, but induced apoptosis. Nude mouse xenograft assay showed that LEF1 knockdown suppressed tumor formation and growth in vivo. In addition, the expression of Notch pathway-related proteins RBP-jκ and Hes1 was reduced in LEF1 knockdown cells. Taken together, LEF1 protein was overexpressed in colon cancer tissues and knockdown of LEF1 expression inhibited colon cancer growth in vitro and in vivo. These data suggest that targeting of LEF1 expression should be further evaluated for colon cancer prevention and therapy.
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Affiliation(s)
- Wen-Juan Wang
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
| | - Yu Yao
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
| | - Li-Li Jiang
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
| | - Ting-Hua Hu
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
| | - Jie-Qun Ma
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
| | - Zi-Jun Liao
- Affiliated Shaanxi Provincial Cancer Hospital, College of Medicine, Xi’an Jiaotong University, Xi’an, China
| | - Jun-Tao Yao
- Affiliated Shaanxi Provincial Cancer Hospital, College of Medicine, Xi’an Jiaotong University, Xi’an, China
| | | | - Shu-Hong Wang
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
- * E-mail: (K-JN); (S-HW)
| | - Ke-Jun Nan
- Department of Oncology, First Affiliated Hospital of Medical College of Xi’an Jiaotong University, Xi’an, China
- * E-mail: (K-JN); (S-HW)
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Harth-Hertle ML, Scholz BA, Erhard F, Glaser LV, Dölken L, Zimmer R, Kempkes B. Inactivation of intergenic enhancers by EBNA3A initiates and maintains polycomb signatures across a chromatin domain encoding CXCL10 and CXCL9. PLoS Pathog 2013; 9:e1003638. [PMID: 24068939 PMCID: PMC3777872 DOI: 10.1371/journal.ppat.1003638] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Accepted: 08/03/2013] [Indexed: 01/28/2023] Open
Abstract
Epstein-Barr virus (EBV) causes a persistent infection in human B cells by establishing specific transcription programs to control B cell activation and differentiation. Transcriptional reprogramming of EBV infected B cells is predominantly driven by the action of EBV nuclear antigens, among them the transcriptional repressor EBNA3A. By comparing gene expression profiles of wt and EBNA3A negative EBV infected B cells, we have previously identified a broad array of cellular genes controlled by EBNA3A. We now find that genes repressed by EBNA3A in these cells are significantly enriched for the repressive histone mark H3K27me3, which is installed by Polycomb group (PcG) proteins. This PcG-controlled subset of genes also carries H3K27me3 marks in a variety of other tissues, suggesting that the commitment to PcG silencing is an intrinsic feature of these gene loci that can be used by EBNA3A. In addition, EBNA3A targets frequently reside in co-regulated gene clusters. To study the mechanism of gene repression by EBNA3A and to evaluate the relative contribution of PcG proteins during this process, we have selected the genomic neighbors CXCL10 and CXCL9 as a model for co-repressed and PcG-controlled genes. We show that EBNA3A binds to CBF1 occupied intergenic enhancers located between CXCL10 and CXCL9 and displaces the transactivator EBNA2. This impairs enhancer activity, resulting in a rapid transcriptional shut-down of both genes in a CBF1-dependent manner and initiation of a delayed gain of H3K27me3 marks covering an extended chromatin domain. H3K27me3 marks increase gradually and are maintained by EBNA3A. Our study provides direct evidence that repression by EBNA3A requires CBF1 and that EBNA3A and EBNA2 compete for access to CBF1 at identical genomic sites. Most importantly, our results demonstrate that transcriptional silencing by EBNA3A precedes the appearance of repressive PcG marks and indicate that both events are triggered by loss of enhancer activity. Epstein-Barr virus (EBV) is a γ-herpesvirus which establishes a latent infection in human B cells and is associated with the pathogenesis of several types of cancer. Here, we report that cellular genes repressed by the EBV nuclear antigen 3A (EBNA3A) in EBV infected B cells frequently form contiguous clusters in the human genome and are committed to epigenetic silencing by Polycomb group (PcG) proteins. The chemokine genes CXCL10 and CXCL9 and their receptors on NK and T cells are critical weapons of the infected host to control herpesvirus infections. CXCL10 and CXCL9 are close neighbors within an extended PcG-controlled domain. We show that EBNA3A binds to intergenic enhancers located between CXCL10 and CXCL9 and displaces the transactivator EBNA2. This process impairs enhancer activity, resulting in a rapid transcriptional shut-down of both genes followed by a delayed gain of PcG histone marks. These PcG marks increase within the following weeks and are maintained by EBNA3A. Our results show that rapid transcriptional shut-down of distal genes and domain-wide PcG silencing is triggered by loss of enhancer activity and suggest that EBNA3A can reprogram the cellular genome in order to escape the immune surveillance of the host.
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Affiliation(s)
- Marie L. Harth-Hertle
- Department of Gene Vectors, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany
| | - Barbara A. Scholz
- Department of Gene Vectors, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany
| | - Florian Erhard
- Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany
| | - Laura V. Glaser
- Department of Gene Vectors, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany
| | - Lars Dölken
- Department of Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Ralf Zimmer
- Institut für Informatik, Ludwig-Maximilians-Universität München, München, Germany
| | - Bettina Kempkes
- Department of Gene Vectors, Helmholtz Center Munich, German Research Center for Environmental Health, Munich, Germany
- * E-mail:
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Zhou S, Fang X, Xin H, Li W, Qiu H, Guan S. Osteoprotegerin inhibits calcification of vascular smooth muscle cell via down regulation of the Notch1-RBP-Jκ/Msx2 signaling pathway. PLoS One 2013; 8:e68987. [PMID: 23874840 PMCID: PMC3711585 DOI: 10.1371/journal.pone.0068987] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 06/03/2013] [Indexed: 01/06/2023] Open
Abstract
Objective Vascular calcification is a common pathobiological process which occurs among
the elder population and in patients with diabetes and chronic kidney
disease. Osteoprotegerin, a secreted glycoprotein that regulates bone mass,
has recently emerged as an important regulator of the development of
vascular calcification. However, the mechanism is not fully understood. The
purpose of this study is to explore novel signaling mechanisms of
osteoprotegerin in the osteoblastic differentiation in rat aortic vascular
smooth muscle cells (VSMCs). Methods and Results VSMCs were isolated from thoracic aorta of Sprague Dawley rats. Osteoblastic
differentiation of VSMCs was induced by an osteogenic medium. We confirmed
by Von Kossa staining and direct cellular calcium measurement that
mineralization was significantly increased in VSMCs cultured in osteogenic
medium; consistent with an enhanced alkaline phosphatase activity. This
osteoblastic differentiation in VSMCs was significantly reduced by the
addition of osteoprotegerin in a dose responsive manner. Moreover, we
identified, by real-time qPCR and western blotting, that expression of
Notch1 and RBP-Jκ were significantly up-regulated in VSMCs cultured in
osteogenic medium at both the mRNA and protein levels, these effects were
dose-dependently abolished by the treatment of osteoprotegerin. Furthermore,
we identified that Msx2, a downstream target of the Notch1/RBP-Jκ signaling,
was markedly down-regulated by the treatment of osteoprotegerin. Conclusion Osteoprotegerin inhibits vascular calcification through the down regulation
of the Notch1-RBP-Jκ signaling pathway.
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Affiliation(s)
- Shaoqiong Zhou
- Department of Gerontology, Union Hospital, Tongji Medical College,
Huazhong University of Science and Technology, Wuhan, China
| | - Xing Fang
- Department of Gerontology, Union Hospital, Tongji Medical College,
Huazhong University of Science and Technology, Wuhan, China
| | - Huaping Xin
- Department of Gerontology, Union Hospital, Tongji Medical College,
Huazhong University of Science and Technology, Wuhan, China
| | - Wei Li
- Department of Gerontology, Union Hospital, Tongji Medical College,
Huazhong University of Science and Technology, Wuhan, China
| | - Hongyu Qiu
- Department of Cell Biology and Molecular Medicine, New Jersey Medical
School, University of Medicine and Dentistry of New Jersey (UMDNJ), Newark, New
Jersey, United States of America
- * E-mail:
(SG); (HQ)
| | - Siming Guan
- Department of Gerontology, Union Hospital, Tongji Medical College,
Huazhong University of Science and Technology, Wuhan, China
- * E-mail:
(SG); (HQ)
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Scholz BA, Harth-Hertle ML, Malterer G, Haas J, Ellwart J, Schulz TF, Kempkes B. Abortive lytic reactivation of KSHV in CBF1/CSL deficient human B cell lines. PLoS Pathog 2013; 9:e1003336. [PMID: 23696732 PMCID: PMC3656114 DOI: 10.1371/journal.ppat.1003336] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Accepted: 03/20/2013] [Indexed: 11/25/2022] Open
Abstract
Since Kaposi's sarcoma associated herpesvirus (KSHV) establishes a persistent infection in human B cells, B cells are a critical compartment for viral pathogenesis. RTA, the replication and transcription activator of KSHV, can either directly bind to DNA or use cellular DNA binding factors including CBF1/CSL as DNA adaptors. In addition, the viral factors LANA1 and vIRF4 are known to bind to CBF1/CSL and modulate RTA activity. To analyze the contribution of CBF1/CSL to reactivation in human B cells, we have successfully infected DG75 and DG75 CBF1/CSL knock-out cell lines with recombinant KSHV.219 and selected for viral maintenance by selective medium. Both lines maintained the virus irrespective of their CBF1/CSL status. Viral reactivation could be initiated in both B cell lines but viral genome replication was attenuated in CBF1/CSL deficient lines, which also failed to produce detectable levels of infectious virus. Induction of immediate early, early and late viral genes was impaired in CBF1/CSL deficient cells at multiple stages of the reactivation process but could be restored to wild-type levels by reintroduction of CBF1/CSL. To identify additional viral RTA target genes, which are directly controlled by CBF1/CSL, we analyzed promoters of a selected subset of viral genes. We show that the induction of the late viral genes ORF29a and ORF65 by RTA is strongly enhanced by CBF1/CSL. Orthologs of ORF29a in other herpesviruses are part of the terminase complex required for viral packaging. ORF65 encodes the small capsid protein essential for capsid shell assembly. Our study demonstrates for the first time that in human B cells viral replication can be initiated in the absence of CBF1/CSL but the reactivation process is severely attenuated at all stages and does not lead to virion production. Thus, CBF1/CSL acts as a global hub which is used by the virus to coordinate the lytic cascade. Kaposi's sarcoma associated herpesvirus (KSHV) establishes a life-long persistent infection in B cells, which constitute the viral reservoir for reactivation and production of progeny virus. Viral reactivation is associated with multiple AIDS related malignancies including Kaposi's sarcoma, an endothelial tumor, and two B cell lymphoproliferative malignancies, the primary effusion lymphoma and the multicentric Castleman's disease. CBF1/CSL is a cellular DNA binding protein that can recruit transactivators or repressors to regulatory sites in the viral and cellular genome. The replication and transcription activator (RTA) plays an essential role in the switch between latency and lytic reactivation. RTA can either bind to DNA directly or is recruited to DNA via anchor proteins like CBF1/CSL and activates transcription. In this study we used a novel cell culture model to analyze the contribution of the CBF1/CSL protein to the process of viral reactivation in human B cells. Two isogenic CBF1/CSL proficient or deficient B cell lines were latently infected with recombinant KSHV. Lytic viral gene expression, viral replication and virus production were compared. Our results suggest that viral lytic gene expression is severely attenuated but not abolished at multiple stages before and after the onset of lytic replication while virus production is below detection levels in CBF1/CSL deficient B cells.
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Affiliation(s)
- Barbara A. Scholz
- Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Marie L. Harth-Hertle
- Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Georg Malterer
- Division of Pathway Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Juergen Haas
- Division of Pathway Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Joachim Ellwart
- Institute of Molecular Immunology, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
| | - Thomas F. Schulz
- Institute of Virology, Hannover Medical School, Hannover, Germany
| | - Bettina Kempkes
- Department of Gene Vectors, Helmholtz Zentrum München, German Research Center for Environmental Health, Munich, Germany
- * E-mail:
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Nowotschin S, Xenopoulos P, Schrode N, Hadjantonakis AK. A bright single-cell resolution live imaging reporter of Notch signaling in the mouse. BMC Dev Biol 2013; 13:15. [PMID: 23617465 PMCID: PMC3663770 DOI: 10.1186/1471-213x-13-15] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 04/11/2013] [Indexed: 12/15/2022]
Abstract
BACKGROUND Live imaging provides an essential methodology for understanding complex and dynamic cell behaviors and their underlying molecular mechanisms. Genetically-encoded reporter expressing mouse strains are an important tool for use in live imaging experiments. Such reporter strains can be engineered by placing cis-regulatory elements of interest to direct the expression of desired reporter genes. If these cis-regulatory elements are downstream targets, and thus activated as a consequence of signaling pathway activation, such reporters can provide read-outs of the signaling status of a cell. The Notch signaling pathway is an evolutionary conserved pathway operating in multiple developmental processes as well as being the basis for several congenital diseases. The transcription factor CBF1 is a central evolutionarily conserved component of the Notch signaling pathway. It binds the active form of the Notch receptor (NICD) and subsequently binds to cis-regulatory regions (CBF1 binding sites) in the promoters of Notch responsive genes. In this way, CBF1 binding sites represent a good target for the design of a Notch signaling reporter. RESULTS To generate a single-cell resolution Notch signaling reporter, we used a CBF responsive element to direct the expression of a nuclear-localized fluorescent protein. To do this, we linked 4 copies of a consensus CBF1 binding site to the basal simian virus 40 (SV40) promoter, placed this cassette in front of a fluorescent protein fusion comprising human histone H2B linked to the yellow fluorescent protein (YFP) Venus, one of the brightest available YFPs. We used the CBF:H2B-Venus construct to generate both transgenic embryonic mouse stem (ES) cell lines and a strain of transgenic mice that would report Notch signaling activity. CONCLUSION By using multiple CBF1 binding sites together with a subcellular-localized, genetically-encoded fluorescent protein, H2B-Venus, we have generated a transgenic strain of mice that faithfully recapitulates Notch signaling at single-cell resolution. This is the first mouse reporter strain in which individual cells transducing a Notch signal can be visualized. The improved resolution of this reporter makes it ideal for live imaging developmental processes regulated by the Notch signaling pathway as well as a short-term lineage tracer of Notch expressing cells due to the perdurance of the fluorescent reporter. Taken together, the CBF:H2B-Venus mouse strain is a unique tool to study and understand the morphogenetic events regulated by the Notch signaling pathway.
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Affiliation(s)
- Sonja Nowotschin
- Developmental Biology Program, Sloan-Kettering Institute, New York, NY, USA
| | | | - Nadine Schrode
- Developmental Biology Program, Sloan-Kettering Institute, New York, NY, USA
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Kim HS, Jeong H, Lim SO, Jung G. Snail inhibits Notch1 intracellular domain mediated transcriptional activation via competing with MAML1. Biochem Biophys Res Commun 2013; 433:6-10. [PMID: 23454378 DOI: 10.1016/j.bbrc.2013.02.079] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2013] [Accepted: 02/20/2013] [Indexed: 11/18/2022]
Abstract
Notch1 intracellular domain (NICD) is the transcription factor which controls cell fate and differentiation in embryonic and tumor cells. Snail has a critical role which increases invasion and metastasis of cancer cell as a transcription factor and epigenetic regulator. Recently, we discovered NICD induced Snail degradation by direct binding interaction with Snail. In this experiment, we found that Snail suppressed transcriptional activity of the protein complex formed with NICD and RBPJk in nucleus. Moreover, Snail decreased transcription of NICD target genes via competing with MAML1, co-activator, in NICD complex. In conclusion, Snail inhibited NICD-mediated transcriptional activation of target genes by physical interaction with NICD.
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Affiliation(s)
- Hyeon Seop Kim
- Department of Biological Sciences, Seoul National University, Seoul, Republic of Korea
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Chen JY, Feng L, Zhang HL, Li JC, Yang XW, Cao XL, Liu L, Qin HY, Liang YM, Han H. Differential regulation of bone marrow-derived endothelial progenitor cells and endothelial outgrowth cells by the Notch signaling pathway. PLoS One 2012; 7:e43643. [PMID: 23118846 PMCID: PMC3485270 DOI: 10.1371/journal.pone.0043643] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Accepted: 07/23/2012] [Indexed: 12/14/2022] Open
Abstract
Endothelial progenitor cells (EPCs) are heterogeneous populations of cells that participate in vasculogenesis and promote tissue regeneration. However the different roles of EPC populations in vasculogenesis and tissue regeneration, as well as their regulation and mechanisms remain elusive. In the present study, we cultured bone marrow (BM)-derived early EPCs (EEPCs) and endothelial outgrowth cells (EOCs), and investigated their roles in liver regeneration and their regulation by the Notch signaling pathway. We found that Notch signaling exhibited different effects on the proliferation and migration of EEPCs and EOCs. Our results also showed that while EEPCs failed to form vessel-like structures in a three dimensional sprouting model in vitro, EOCs could sprout and form endothelial cords, and this was regulated by the Notch signaling. We further showed that, by using a conditional knockout model of RBP-J (the critical transcription factor mediating Notch signaling), Notch signaling differentially regulates EEPCs and EOCs. In a partial hepatectomy (PHx) model, EEPCs Notch-dependently benefitted liver regeneration with respect to liver function and hepatocyte proliferation and apoptosis. In contrast, EOCs appeared not directly involved in the recovery of liver function and the increase of hepatocytes. These data suggested that the RBP-J-mediated Notch signaling differentially regulated the two types of EPCs, which showed different roles in liver regeneration.
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Affiliation(s)
- Jing-Yuan Chen
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Lei Feng
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Hai-Long Zhang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Jun-Chang Li
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Xin-Wei Yang
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Xiu-Li Cao
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Li Liu
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Hong-Yan Qin
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
| | - Ying-Min Liang
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (Y-ML); (HH)
| | - Hua Han
- Department of Hematology, Tangdu Hospital, Fourth Military Medical University, Xi'an, People's Republic of China
- State Key Laboratory of Cancer Biology, Department of Medical Genetics and Developmental Biology, Fourth Military Medical University, Xi'an, People's Republic of China
- * E-mail: (Y-ML); (HH)
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Sato C, Turkoz M, Dearborn JT, Wozniak DF, Kopan R, Hass MR. Loss of RBPj in postnatal excitatory neurons does not cause neurodegeneration or memory impairments in aged mice. PLoS One 2012; 7:e48180. [PMID: 23110206 PMCID: PMC3482205 DOI: 10.1371/journal.pone.0048180] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2012] [Accepted: 09/25/2012] [Indexed: 02/04/2023] Open
Abstract
Previous studies suggest that loss of γ-secretase activity in postnatal mouse brains causes age-dependent memory impairment and neurodegeneration. Due to the diverse array of γ-secretase substrates, it remains to be demonstrated whether loss of cleavage of any specific substrate(s) is responsible for these defects. The bulk of the phenotypes observed in mammals deficient for γ-secretase or exposed to γ-secretase inhibitors are caused by the loss of Notch receptor proteolysis. Accordingly, inhibition of Notch signaling is the main cause for untoward effects for γ-secretase inhibitors as therapeutics for Alzheimer's disease. Therefore, we wished to determine if loss of canonical Notch signaling is responsible for the age-dependent neurodegeneration observed upon γ-secrectase deficiency in the mouse brain. We generated postnatal forebrain-specific RBPj conditional knockout (cKO) mice using the CamKII-Cre driver and examined behavior and brain pathology in 12-18 month old animals. Since all four mammalian Notch receptor homologues signal via this DNA binding protein, these mice lack canonical Notch signaling. We found that loss of RBPj in mature excitatory neurons was well tolerated, with no evidence for neurodegeneration or of learning and memory impairment in mice aged up to 18 months. The only phenotypic deficit we observed in the RBPj-deficient mice was a subtle abnormality in olfactory preferences, particularly in females. We conclude that the loss of canonical Notch signaling through the four receptors is not responsible for age-dependent neurodegeneration or learning and memory deficits seen in γ-secretase deficient mice.
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Affiliation(s)
- Chihiro Sato
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Mustafa Turkoz
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Joshua T. Dearborn
- Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - David F. Wozniak
- Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Raphael Kopan
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
| | - Matthew R. Hass
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, United States of America
- * E-mail:
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Sundlisaeter E, Edelmann RJ, Hol J, Sponheim J, Küchler AM, Weiss M, Udalova IA, Midwood KS, Kasprzycka M, Haraldsen G. The alarmin IL-33 is a notch target in quiescent endothelial cells. Am J Pathol 2012; 181:1099-111. [PMID: 22809957 DOI: 10.1016/j.ajpath.2012.06.003] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 04/16/2012] [Accepted: 06/05/2012] [Indexed: 11/23/2022]
Abstract
The molecular mechanisms that drive expression of the alarmin interleukin-33 (IL-33) in endothelial cells are unknown. Because nuclear IL-33 is a marker of endothelial cell quiescence (corroborated in this study by coexpression of cyclin-dependent kinase inhibitor p27(Kip1)), we hypothesized that Notch signaling might be involved in regulating IL-33 expression. Activation of Notch1 by immobilized Notch ligands was sufficient to induce nuclear IL-33 expression in cultured endothelial cells. Conversely, IL-33 expression was inhibited by the γ-secretase inhibitor DAPT or by inhibiting the function of Dll4, Jagged1, Notch1, or the canonical Notch transcription factor RBP-Jκ. Insensitivity to cycloheximide indicated that IL-33 was a direct target of Notch signaling, well in line with the identification of several conserved RBP-Jκ binding sites in the IL33 gene. The in vivo expression of Dll4 but not of Jagged1 was well correlated with expression of IL-33 in quiescent vessels, and subcutaneous injection of DAPT in healthy skin reduced IL-33 expression, indicating that Notch signaling was involved. On the other hand, loss of IL-33 during angiogenesis occurred despite sustained Dll4 and Notch1 expression, suggesting that other signals may override the IL-33-driving signal in this context. Taken together, our data demonstrate that endothelial nuclear IL-33 is induced by Notch and that Dll4 may be the dominant ligand responsible for this signaling in vivo.
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Affiliation(s)
- Eirik Sundlisaeter
- Laboratory for Immunohistochemistry and Immunopathology, Department of Pathology, Oslo University Hospital, Norway
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Hassed SJ, Wiley GB, Wang S, Lee JY, Li S, Xu W, Zhao ZJ, Mulvihill JJ, Robertson J, Warner J, Gaffney PM. RBPJ mutations identified in two families affected by Adams-Oliver syndrome. Am J Hum Genet 2012; 91:391-5. [PMID: 22883147 DOI: 10.1016/j.ajhg.2012.07.005] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Revised: 05/21/2012] [Accepted: 07/01/2012] [Indexed: 01/17/2023] Open
Abstract
Through exome resequencing, we identified two unique mutations in recombination signal binding protein for immunoglobulin kappa J (RBPJ) in two independent families affected by Adams-Oliver syndrome (AOS), a rare multiple-malformation disorder consisting primarily of aplasia cutis congenita of the vertex scalp and transverse terminal limb defects. These identified mutations link RBPJ, the primary transcriptional regulator for the Notch pathway, with AOS, a human genetic disorder. Functional assays confirmed impaired DNA binding of mutated RBPJ, placing it among other notch-pathway proteins altered in human genetic syndromes.
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Affiliation(s)
- Susan J Hassed
- Department of Pediatrics, University of Oklahoma Health Sciences Center, University of Oklahoma Children's Physicians Building, 1200 Children's Avenue, Oklahoma City, OK 73104, USA.
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Abstract
The Notch signaling pathway is an intercellular communication network vital to metazoan development. Notch activation leads to the nuclear localization of the intracellular portion (NICD) of the Notch receptor. Once in the nucleus, NICD binds the transcription factor CSL through a bivalent interaction involving the high-affinity RAM region and the lower affinity ANK domain, converting CSL from a transcriptionally-repressed to an active state. This interaction is believed to directly displace co-repressor proteins from CSL and recruit co-activator proteins. Here we investigate the consequences of this bivalent organization in converting CSL from the repressed to active form. One proposed function of RAM is to promote the weak ANK:CSL interaction; thus, fusion of CSL-ANK should bypass this function of RAM. We find that a CSL-ANK fusion protein is transcriptionally active in reporter assays, but that the addition of RAM in trans further increases transcriptional activity, suggesting another role of RAM in activation. A single F235L point substitution, which disrupts co-repressor binding to CSL, renders the CSL-ANK fusion fully active and refractory to further stimulation by RAM in trans. These results suggest that in the context of a mammalian CSL-ANK fusion protein, the main role of RAM is to displace co-repressor proteins from CSL.
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Affiliation(s)
- Scott E. Johnson
- T.C. Jenkins Department of Biophysics, The Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Douglas Barrick
- T.C. Jenkins Department of Biophysics, The Johns Hopkins University, Baltimore, Maryland, United States of America
- * E-mail:
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Nagao H, Setoguchi T, Kitamoto S, Ishidou Y, Nagano S, Yokouchi M, Abematsu M, Kawabata N, Maeda S, Yonezawa S, Komiya S. RBPJ is a novel target for rhabdomyosarcoma therapy. PLoS One 2012; 7:e39268. [PMID: 22792167 PMCID: PMC3392254 DOI: 10.1371/journal.pone.0039268] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 05/22/2012] [Indexed: 01/20/2023] Open
Abstract
The Notch pathway regulates a broad spectrum of cell fate decisions and differentiation processes during fetal and postnatal development. In addition, the Notch pathway plays an important role in controlling tumorigenesis. However, the role of RBPJ, a transcription factor in the Notch pathway, in the development of tumors is largely unknown. In this study, we focused on the role of RBPJ in the pathogenesis of rhabdomyosarcoma (RMS). Our data showed that Notch pathway genes were upregulated and activated in human RMS cell lines and patient samples. Inhibition of the Notch pathway by a γ-secretase inhibitor (GSI) decreased the in vitro proliferation of RMS cells. Knockdown of RBPJ expression by RNAi inhibited the anchorage-independent growth of RMS cells and the growth of xenografts in vivo. Additionally, overexpression of RBPJ promoted the anchorage-independent growth of RMS cells. Further, we revealed that RBPJ regulated the cell cycle in RMS xenograft tumors and decreased proliferation. Our findings suggest that RBPJ regulates the RMS growth, and that the inhibition of RBPJ may be an effective therapeutic approach for patients with RMS.
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Affiliation(s)
- Hiroko Nagao
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
- The Near-Future Locomotor Organ Medicine Creation Course (Kusunoki Kai), Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Takao Setoguchi
- The Near-Future Locomotor Organ Medicine Creation Course (Kusunoki Kai), Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
- * E-mail:
| | - Sho Kitamoto
- Department of Human Pathology, Field of Oncology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Yasuhiro Ishidou
- Department of Medical Joint Materials, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Satoshi Nagano
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Masahiro Yokouchi
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Masahiko Abematsu
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
- The Near-Future Locomotor Organ Medicine Creation Course (Kusunoki Kai), Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Naoya Kawabata
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Shingo Maeda
- Department of Medical Joint Materials, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Suguru Yonezawa
- Department of Human Pathology, Field of Oncology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
| | - Setsuro Komiya
- Department of Orthopaedic Surgery, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan
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Lu J, Verma SC, Cai Q, Saha A, Dzeng RK, Robertson ES. The RBP-Jκ binding sites within the RTA promoter regulate KSHV latent infection and cell proliferation. PLoS Pathog 2012; 8:e1002479. [PMID: 22253595 PMCID: PMC3257303 DOI: 10.1371/journal.ppat.1002479] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 11/27/2011] [Indexed: 01/10/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is tightly linked to at least two lymphoproliferative disorders, primary effusion lymphoma (PEL) and multicentric Castleman's disease (MCD). However, the development of KSHV-mediated lymphoproliferative disease is not fully understood. Here, we generated two recombinant KSHV viruses deleted for the first RBP-Jκ binding site (RTA1st) and all three RBP-Jκ binding sites (RTAall) within the RTA promoter. Our results showed that RTA1st and RTAall recombinant viruses possess increased viral latency and a decreased capability for lytic replication in HEK 293 cells, enhancing colony formation and proliferation of infected cells. Furthermore, recombinant RTA1st and RTAall viruses showed greater infectivity in human peripheral blood mononuclear cells (PBMCs) relative to wt KSHV. Interestingly, KSHV BAC36 wt, RTA1st and RTAall recombinant viruses infected both T and B cells and all three viruses efficiently infected T and B cells in a time-dependent manner early after infection. Also, the capability of both RTA1st and RTAall recombinant viruses to infect CD19+ B cells was significantly enhanced. Surprisingly, RTA1st and RTAall recombinant viruses showed greater infectivity for CD3+ T cells up to 7 days. Furthermore, studies in Telomerase-immortalized human umbilical vein endothelial (TIVE) cells infected with KSHV corroborated our data that RTA1st and RTAall recombinant viruses have enhanced ability to persist in latently infected cells with increased proliferation. These recombinant viruses now provide a model to explore early stages of primary infection in human PBMCs and development of KSHV-associated lymphoproliferative diseases. Kaposi's sarcoma-associated herpesvirus (KSHV) is tightly linked to at least two lymphoproliferative disorders, primary effusion lymphoma (PEL) and multicentric Castleman's disease (MCD). The life cycle of KSHV consists of latent and lytic phase. RTA is the master switch for viral lytic replication. In this study, we first show that recombinant viruses deleted for the RBP-Jκ sites within the RTA promoter have a decreased capability for lytic replication, and thus enhanced colony formation and proliferation of infected cells. Interestingly, the recombinant viruses show greater infectivity in human peripheral blood mononuclear cells (PBMCs). The recombinant viruses also infected CD19+ B cells and CD3+ T cells with increased efficiency in a time-dependent manner and now provide a model which can be used to explore the early stages of primary infection in human PBMCs, as well as the development of KSHV-associated lymphoproliferative diseases.
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Affiliation(s)
- Jie Lu
- Department of Microbiology and Tumor Virology Program of the Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Subhash C. Verma
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, Reno, Nevada, United States of America
| | - Qiliang Cai
- Department of Microbiology and Tumor Virology Program of the Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Abhik Saha
- Department of Microbiology and Tumor Virology Program of the Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Richard Kuo Dzeng
- Department of Microbiology and Tumor Virology Program of the Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Erle S. Robertson
- Department of Microbiology and Tumor Virology Program of the Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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50
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Bartels SJJ, Spruijt CG, Brinkman AB, Jansen PWTC, Vermeulen M, Stunnenberg HG. A SILAC-based screen for Methyl-CpG binding proteins identifies RBP-J as a DNA methylation and sequence-specific binding protein. PLoS One 2011; 6:e25884. [PMID: 21991380 PMCID: PMC3185043 DOI: 10.1371/journal.pone.0025884] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 09/13/2011] [Indexed: 11/19/2022] Open
Abstract
Background DNA methylation is an epigenetic modification that plays a crucial role in a variety of biological processes. Methylated DNA is specifically bound by Methyl-CpG Binding Proteins (MBPs). Three different types of MBPs have been identified so far: the Methyl-CpG Binding Domain (MBD) family proteins, three BTB/POZ-Zn-finger proteins, and UHRF1. Most of the known MBPs have been identified via homology with the MBD and Zn-finger domains as present in MeCP2 and Kaiso, respectively. It is conceivable that other proteins are capable of recognizing methylated DNA. Methodology/Principal Findings For the purpose of identifying novel ‘readers’ we set up a methyl-CpG pull-down assay combined with stable-isotope labeling by amino acids in cell culture (SILAC). In a methyl-CpG pull-down with U937 nuclear extracts, we recovered several known MBPs and almost all subunits of the MBD2/NuRD complex as methylation specific binders, providing proof-of-principle. Interestingly, RBP-J, the transcription factor downstream of Notch receptors, also bound the DNA in a methylation dependent manner. Follow-up pull-downs and electrophoretic mobility shift assays (EMSAs) showed that RBP-J binds methylated DNA in the context of a mutated RBP-J consensus motif. Conclusions/Significance The here described SILAC/methyl-CpG pull-down constitutes a new approach to identify potential novel DNAme readers and will advance unraveling of the complete methyl-DNA interactome.
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Affiliation(s)
- Stefanie J. J. Bartels
- Department of Molecular Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Cornelia G. Spruijt
- Department of Molecular Cancer Research, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Arie B. Brinkman
- Department of Molecular Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, Nijmegen, The Netherlands
| | - Pascal W. T. C. Jansen
- Department of Molecular Cancer Research, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Michiel Vermeulen
- Department of Molecular Cancer Research, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Hendrik G. Stunnenberg
- Department of Molecular Biology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen, Nijmegen, The Netherlands
- * E-mail:
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