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Teichmann T, Malacarne P, Zehr S, Günther S, Pflüger-Müller B, Warwick T, Brandes RP. NCoR1 limits angiogenic capacity by altering Notch signaling. J Mol Cell Cardiol 2024; 188:65-78. [PMID: 38359551 DOI: 10.1016/j.yjmcc.2024.02.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Revised: 01/15/2024] [Accepted: 02/06/2024] [Indexed: 02/17/2024]
Abstract
Corepressors negatively regulate gene expression by chromatin compaction. Targeted regulation of gene expression could provide a means to control endothelial cell phenotype. We hypothesize that by targeting corepressor proteins, endothelial angiogenic function can be improved. To study this, the expression and function of nuclear corepressors in human umbilical vein endothelial cells (HUVEC) and in murine organ culture was studied. RNA-seq revealed that nuclear receptor corepressor 1 (NCoR1), silencing mediator of retinoid and thyroid hormone receptors (SMRT) and repressor element-1 silencing transcription factor (REST) are the highest expressed corepressors in HUVECs. Knockout and knockdown strategies demonstrated that the depletion of NCoR1 increased the angiogenic capacity of endothelial cells, whereas depletion of SMRT or REST did not. Interestingly, the effect was VEGF signaling independent. NCoR1 depletion significantly upregulated angiogenesis-associated genes, especially tip cell genes, including ESM1, DLL4 and NOTCH4, as observed by RNA- and ATAC-seq. Confrontation assays comparing cells with and without NCoR1-deficiency revealed that loss of NCoR1 promotes a tip-cell position during spheroid sprouting. Moreover, a proximity ligation assay identified NCoR1 as a direct binding partner of the Notch-signaling-related transcription factor RBPJk. Luciferase assays showed that siRNA-mediated knockdown of NCOR1 promotes RBPJk activity. Furthermore, NCoR1 depletion prompts upregulation of several elements in the Notch signaling cascade. Downregulation of NOTCH4, but not NOTCH1, prevented the positive effect of NCOR1 knockdown on spheroid outgrowth. Collectively, these data indicate that decreasing NCOR1 expression is an attractive approach to promote angiogenic function.
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Affiliation(s)
- Tom Teichmann
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany
| | - Pedro Malacarne
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany
| | - Simonida Zehr
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany
| | - Stefan Günther
- Max-Planck-Institute for Heart- and Lung Research (MPI-HLR), Bad Nauheim 61231, Germany
| | - Beatrice Pflüger-Müller
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany
| | - Timothy Warwick
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany.
| | - Ralf P Brandes
- Institute for Cardiovascular Physiology, Goethe University, Frankfurt am Main 60590, Germany; German Center for Cardiovascular Research (DZHK), Partner site Rhein Main, Frankfurt am Main, Germany.
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Shi J, Yu X, Li G, Zhao X, Chen J, Fang Y, Yang Y, Wang T, Xu T, Bian L, Lyu L, He Y. DTL promotes head and neck squamous cell carcinoma progression by mediating the degradation of ARGLU1 to regulate the Notch signaling pathway. Int J Biol Macromol 2024; 259:129184. [PMID: 38218284 DOI: 10.1016/j.ijbiomac.2023.129184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 12/30/2023] [Accepted: 12/30/2023] [Indexed: 01/15/2024]
Abstract
Head and neck squamous cell carcinoma (HNSCC) is the sixth most common cancer worldwide, with a high incidence in squamous epithelium. The E3 ubiquitin ligase DTL is a component of the CRL4A complex and is widely involved in tumor progression. We aimed to analyze the role of DTL in HNSCC and to explore its mechanism of action. Through clinical analysis, we found that DTL is upregulated in HNSCC tissues and is associated with the tumor microenvironment and poor survival in patients. Through gain-of-function and loss-of-function assays, we showed that DTL promotes cell proliferation and migration in vitro and tumor growth in vivo. Mass spectrometry analysis and immunoprecipitation assays showed that DTL interacts with ARGLU1 to promote K11-linked ubiquitination-mediated degradation of ARGLU1, thereby promoting the activation of the CSL-dependent Notch signaling pathway. Furthermore, siARGLU1 blocks the inhibitory effects of DTL knockdown on HNSCC cells. In this study, we showed that DTL promotes HNSCC progression through K11-linked ubiquitination of ARGLU1 to activate the CSL-dependent Notch pathway. These findings identify a promising therapeutic target for HNSCC.
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Affiliation(s)
- Jingpei Shi
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China; Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Xiaonan Yu
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China
| | - Guoyu Li
- Department of Colorectal Surgery, Yunnan Cancer Hospital, The Third Affiliated Hospital of Kunming Medical University, Kunming 650118, Yunnan, China
| | - Xiaoyu Zhao
- Department of Dermatology, The First Affiliated Hospital of Kunming Medical University, Kunming 650032,Yunnan, China
| | - Jiwen Chen
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Ying Fang
- Department of Infection and Hepatology, The First Affiliated Hospital of Kunming Medical University, 650032, Yunnan, China
| | - Yan Yang
- Department of Hepatobiliary and Pancreatic Surgery and Liver Transplantion, the First People's Hospital of Kunming, Kunming 650011, Yunnan, China
| | - Ting Wang
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Tianyong Xu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China
| | - Li Bian
- Department of Pathology, The First Affiliated Hospital of Kunming Medical University, Kunming 650032, Yunnan, China.
| | - Lechun Lyu
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Science and Technology Achievement Incubation Center, Kunming Medical University, Kunming 650500, Yunnan, China.
| | - Yongwen He
- Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology, Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, NHC Key Laboratory of Drug Addiction Medicine, Kunming Medical University, Kunming 650106, Yunnan, China; Qujing Medical College, Qujing 655099, Yunnan, China.
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3
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Tran LN, Loew SK, Franco SJ. Notch Signaling Plays a Dual Role in Regulating the Neuron-to-Oligodendrocyte Switch in the Developing Dorsal Forebrain. J Neurosci 2023; 43:6854-6871. [PMID: 37640551 PMCID: PMC10573779 DOI: 10.1523/jneurosci.0144-23.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 07/26/2023] [Accepted: 08/17/2023] [Indexed: 08/31/2023] Open
Abstract
Neural progenitor cells in the developing dorsal forebrain generate excitatory neurons followed by oligodendrocytes (OLs) and astrocytes. However, the specific mechanisms that regulate the timing of this neuron-glia switch are not fully understood. In this study, we show that the proper balance of Notch signaling in dorsal forebrain progenitors is required to generate oligodendrocytes during late stages of embryonic development. Using ex vivo and in utero approaches in mouse embryos of both sexes, we found that Notch inhibition reduced the number of oligodendrocyte lineage cells in the dorsal pallium. However, Notch overactivation also prevented oligodendrogenesis and maintained a progenitor state. These results point toward a dual role for Notch signaling in both promoting and inhibiting oligodendrogenesis, which must be fine-tuned to generate oligodendrocyte lineage cells at the right time and in the right numbers. We further identified the canonical Notch downstream factors HES1 and HES5 as negative regulators in this process. CRISPR (clustered regularly interspaced short palindromic repeat)/Cas9-mediated knockdown of Hes1 and Hes5 caused increased expression of the pro-oligodendrocyte factor ASCL1 and led to precocious oligodendrogenesis. Conversely, combining Notch overactivation with ASCL1 overexpression robustly promoted oligodendrogenesis, indicating a separate mechanism of Notch that operates synergistically with ASCL1 to specify an oligodendrocyte fate. We propose a model in which Notch signaling works together with ASCL1 to specify progenitors toward the oligodendrocyte lineage but also maintains a progenitor state through Hes-dependent repression of Ascl1 so that oligodendrocytes are not made too early, thus contributing to the precise timing of the neuron-glia switch.SIGNIFICANCE STATEMENT Neural progenitors make oligodendrocytes after neurogenesis starts to wind down, but the mechanisms that control the timing of this switch are poorly understood. In this study, we identify Notch signaling as a critical pathway that regulates the balance between progenitor maintenance and oligodendrogenesis. Notch signaling is required for the oligodendrocyte fate, but elevated Notch signaling prevents oligodendrogenesis and maintains a progenitor state. We provide evidence that these opposing functions are controlled by different mechanisms. Before the switch, Notch signaling through Hes factors represses oligodendrogenesis. Later, Notch signaling through an unknown mechanism promotes oligodendrogenesis synergistically with the transcription factor ASCL1. Our study underscores the complexity of Notch and reveals its importance in regulating the timing and numbers of oligodendrocyte production.
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Affiliation(s)
- Luuli N Tran
- Department of Pediatrics, Section of Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
- Molecular Biology Graduate Program, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Sarah K Loew
- Department of Pediatrics, Section of Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
- Gates Summer Internship Program, Gates Institute, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Santos J Franco
- Department of Pediatrics, Section of Developmental Biology, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
- Molecular Biology Graduate Program, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
- Gates Summer Internship Program, Gates Institute, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
- Program in Pediatric Stem Cell Biology, Children's Hospital Colorado, Aurora, Colorado 80045
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4
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Azevedo-Pouly A, Hale MA, Swift GH, Hoang CQ, Deering TG, Xue J, Wilkie TM, Murtaugh LC, MacDonald RJ. Key transcriptional effectors of the pancreatic acinar phenotype and oncogenic transformation. PLoS One 2023; 18:e0291512. [PMID: 37796967 PMCID: PMC10553828 DOI: 10.1371/journal.pone.0291512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 08/30/2023] [Indexed: 10/07/2023] Open
Abstract
Proper maintenance of mature cellular phenotypes is essential for stable physiology, suppression of disease states, and resistance to oncogenic transformation. We describe the transcriptional regulatory roles of four key DNA-binding transcription factors (Ptf1a, Nr5a2, Foxa2 and Gata4) that sit at the top of a regulatory hierarchy controlling all aspects of a highly differentiated cell-type-the mature pancreatic acinar cell (PAC). Selective inactivation of Ptf1a, Nr5a2, Foxa2 and Gata4 individually in mouse adult PACs rapidly altered the transcriptome and differentiation status of PACs. The changes most emphatically included transcription of the genes for the secretory digestive enzymes (which conscript more than 90% of acinar cell protein synthesis), a potent anabolic metabolism that provides the energy and materials for protein synthesis, suppressed and properly balanced cellular replication, and susceptibility to transformation by oncogenic KrasG12D. The simultaneous inactivation of Foxa2 and Gata4 caused a greater-than-additive disruption of gene expression and uncovered their collaboration to maintain Ptf1a expression and control PAC replication. A measure of PAC dedifferentiation ranked the effects of the conditional knockouts as Foxa2+Gata4 > Ptf1a > Nr5a2 > Foxa2 > Gata4. Whereas the loss of Ptf1a or Nr5a2 greatly accelerated Kras-mediated transformation of mature acinar cells in vivo, the absence of Foxa2, Gata4, or Foxa2+Gata4 together blocked transformation completely, despite extensive dedifferentiation. A lack of correlation between PAC dedifferentiation and sensitivity to oncogenic KrasG12D negates the simple proposition that the level of differentiation determines acinar cell resistance to transformation.
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Affiliation(s)
- Ana Azevedo-Pouly
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Michael A. Hale
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Galvin H. Swift
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Chinh Q. Hoang
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Tye G. Deering
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Jumin Xue
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - Thomas M. Wilkie
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
| | - L. Charles Murtaugh
- Department of Human Genetics, University of Utah, Salt Lake City, Utah, United States of America
| | - Raymond J. MacDonald
- Department of Molecular Biology and the Hamon Center for Regenerative Science and Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States of America
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5
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Dietrich B, Haider S, Meinhardt G, Pollheimer J, Knöfler M. WNT and NOTCH signaling in human trophoblast development and differentiation. Cell Mol Life Sci 2022; 79:292. [PMID: 35562545 PMCID: PMC9106601 DOI: 10.1007/s00018-022-04285-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/25/2022] [Accepted: 04/01/2022] [Indexed: 12/16/2022]
Abstract
Correct development of the human placenta and its differentiated epithelial cells, syncytial trophoblasts (STBs) and extravillous trophoblasts (EVTs), is crucial for a successful pregnancy outcome. STBs develop by cell fusion of mononuclear cytotrophoblasts (CTBs) in placental floating villi, whereas migratory EVTs originate from specialized villi anchoring to the maternal decidua. Defects in trophoblast differentiation have been associated with severe pregnancy disorders such as early-onset preeclampsia and fetal growth restriction. However, the evolutionary pathways underlying normal and adverse placentation are poorly understood. Herein, we discuss Wingless (WNT) and NOTCH signaling, two pathways that play pivotal roles in human placenta and trophoblast development. Whereas WNT is necessary for expansion of trophoblast progenitors and stem cells, NOTCH1 is required for proliferation and survival of EVT precursors. Differentiation of the latter is orchestrated by a switch in NOTCH receptor expression as well as by changes in WNT ligands and their downstream effectors.
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Affiliation(s)
- Bianca Dietrich
- grid.22937.3d0000 0000 9259 8492Placental Development Group, Department of Obstetrics and Gynaecology, Reproductive Biology Unit, Medical University of Vienna, Währinger Gürtel 18–20, 5Q, 1090 Vienna, Austria
| | - Sandra Haider
- grid.22937.3d0000 0000 9259 8492Placental Development Group, Department of Obstetrics and Gynaecology, Reproductive Biology Unit, Medical University of Vienna, Währinger Gürtel 18–20, 5Q, 1090 Vienna, Austria
| | - Gudrun Meinhardt
- grid.22937.3d0000 0000 9259 8492Placental Development Group, Department of Obstetrics and Gynaecology, Reproductive Biology Unit, Medical University of Vienna, Währinger Gürtel 18–20, 5Q, 1090 Vienna, Austria
| | - Jürgen Pollheimer
- grid.22937.3d0000 0000 9259 8492Maternal-Fetal Immunology Group, Department of Obstetrics and Gynaecology, Reproductive Biology Unit, Medical University of Vienna, Währinger Gürtel 18–20, 5Q, 1090 Vienna, Austria
| | - Martin Knöfler
- grid.22937.3d0000 0000 9259 8492Placental Development Group, Department of Obstetrics and Gynaecology, Reproductive Biology Unit, Medical University of Vienna, Währinger Gürtel 18–20, 5Q, 1090 Vienna, Austria
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6
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Ye Z, Braden CR, Wills A, Kimelman D. Identification of in vivo Hox13-binding sites reveals an essential locus controlling zebrafish brachyury expression. Development 2021; 148:268973. [PMID: 34061173 DOI: 10.1242/dev.199408] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 04/19/2021] [Indexed: 12/19/2022]
Abstract
During early embryogenesis, the vertebrate embryo extends from anterior to posterior because of the progressive addition of cells from a posteriorly localized neuromesodermal progenitor (NMp) population. An autoregulatory loop between Wnt and Brachyury/Tbxt is required for NMps to retain mesodermal potential and, hence, normal axis development. We recently showed that Hox13 genes help to support body axis formation and to maintain the autoregulatory loop, although the direct Hox13 target genes were unknown. Here, using a new method for identifying in vivo transcription factor-binding sites, we identified more than 500 potential Hox13 target genes in zebrafish. Importantly, we found two highly conserved Hox13-binding elements far from the tbxta transcription start site that also contain a conserved Tcf7/Lef1 (Wnt response) site. We show that the proximal of the two elements is sufficient to confer somitogenesis-stage expression to a tbxta promoter that, on its own, only drives NMp expression during gastrulation. Importantly, elimination of this proximal element produces shortened embryos due to aberrant formation of the most posterior somites. Our study provides a potential direct connection between Hox13 and regulation of the Wnt/Brachyury loop.
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Affiliation(s)
- Zhi Ye
- Department of Biochemistry, University of Washington, Seattle, WA 98195-7350, USA
| | - Christopher R Braden
- Department of Biochemistry, University of Washington, Seattle, WA 98195-7350, USA
| | - Andrea Wills
- Department of Biochemistry, University of Washington, Seattle, WA 98195-7350, USA
| | - David Kimelman
- Department of Biochemistry, University of Washington, Seattle, WA 98195-7350, USA
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7
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Pang J, Le L, Zhou Y, Tu R, Hou Q, Tsuchiya D, Thomas N, Wang Y, Yu Z, Alexander R, Thexton M, Lewis B, Corbin T, Durnin M, Li H, Ashery-Padan R, Yan D, Xie T. NOTCH Signaling Controls Ciliary Body Morphogenesis and Secretion by Directly Regulating Nectin Protein Expression. Cell Rep 2021; 34:108603. [PMID: 33440163 DOI: 10.1016/j.celrep.2020.108603] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 11/20/2020] [Accepted: 12/14/2020] [Indexed: 11/29/2022] Open
Abstract
Anterior segment dysgenesis is often associated with cornea diseases, cataracts, and glaucoma. In the anterior segment, the ciliary body (CB) containing inner and outer ciliary epithelia (ICE and OCE) secretes aqueous humor that maintains intraocular pressure (IOP). However, CB development and function remain poorly understood. Here, this study shows that NOTCH signaling in the CB maintains the vitreous, IOP, and eye structures by regulating CB morphogenesis, aqueous humor secretion, and vitreous protein expression. Notch2 and Notch3 function via RBPJ in the CB to control ICE-OCE adhesion, CB morphogenesis, aqueous humor secretion, and protein expression, thus maintaining IOP and eye structures. Mechanistically, NOTCH signaling transcriptionally controls Nectin1 expression in the OCE to promote cell adhesion for driving CB morphogenesis and to directly stabilize Cx43 for controlling aqueous humor secretion. Finally, NOTCH signaling directly controls vitreous protein secretion in the ICE. Therefore, this study provides important insight into CB functions and involvement in eye diseases.
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Affiliation(s)
- Ji Pang
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA; School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Liang Le
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Yi Zhou
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA; Department of Anatomy and Cell Biology, University of Kansas School of Medicine, 3901 Rainbow Blvd, Kansas City, KS 66160, USA
| | - Renjun Tu
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Qiang Hou
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA; State Key Laboratory and Key Laboratory of Vision Science, School of Ophthalmology and Optometry, Eye Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Dai Tsuchiya
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Nancy Thomas
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Yongfu Wang
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Zulin Yu
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Richard Alexander
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Marina Thexton
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Brandy Lewis
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Timothy Corbin
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Michael Durnin
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Hua Li
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA
| | - Ruth Ashery-Padan
- Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Deyue Yan
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Ting Xie
- Stowers Institute for Medical Research, 1000 East 50(th) Street, Kansas City, MO 64110, USA; Department of Anatomy and Cell Biology, University of Kansas School of Medicine, 3901 Rainbow Blvd, Kansas City, KS 66160, USA.
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8
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Katarkar A, Bottoni G, Clocchiatti A, Goruppi S, Bordignon P, Lazzaroni F, Gregnanin I, Ostano P, Neel V, Dotto GP. NOTCH1 gene amplification promotes expansion of Cancer Associated Fibroblast populations in human skin. Nat Commun 2020; 11:5126. [PMID: 33046701 PMCID: PMC7550609 DOI: 10.1038/s41467-020-18919-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Accepted: 09/09/2020] [Indexed: 12/23/2022] Open
Abstract
Cancer associated fibroblasts (CAFs) are a key component of the tumor microenvironment. Genomic alterations in these cells remain a point of contention. We report that CAFs from skin squamous cell carcinomas (SCCs) display chromosomal alterations, with heterogeneous NOTCH1 gene amplification and overexpression that also occur, to a lesser extent, in dermal fibroblasts of apparently unaffected skin. The fraction of the latter cells harboring NOTCH1 amplification is expanded by chronic UVA exposure, to which CAFs are resistant. The advantage conferred by NOTCH1 amplification and overexpression can be explained by NOTCH1 ability to block the DNA damage response (DDR) and ensuing growth arrest through suppression of ATM-FOXO3a association and downstream signaling cascade. In an orthotopic model of skin SCC, genetic or pharmacological inhibition of NOTCH1 activity suppresses cancer/stromal cells expansion. Here we show that NOTCH1 gene amplification and increased expression in CAFs are an attractive target for stroma-focused anti-cancer intervention.
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Affiliation(s)
- Atul Katarkar
- Department of Biochemistry, University of Lausanne, 1066, Epalinges, Switzerland
| | - Giulia Bottoni
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, 02129, USA.,Department of Dermatology, Harvard Medical School, Boston, MA, 02125, USA
| | - Andrea Clocchiatti
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, 02129, USA.,Department of Dermatology, Harvard Medical School, Boston, MA, 02125, USA
| | - Sandro Goruppi
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, 02129, USA.,Department of Dermatology, Harvard Medical School, Boston, MA, 02125, USA
| | - Pino Bordignon
- Department of Biochemistry, University of Lausanne, 1066, Epalinges, Switzerland
| | - Francesca Lazzaroni
- Department of Biochemistry, University of Lausanne, 1066, Epalinges, Switzerland
| | - Ilaria Gregnanin
- Cancer Genomics Laboratory, Edo and Elvo Tempia Valenta Foundation, Biella, 13900, Italy
| | - Paola Ostano
- Cancer Genomics Laboratory, Edo and Elvo Tempia Valenta Foundation, Biella, 13900, Italy
| | - Victor Neel
- Department of Dermatology, Massachusetts General Hospital, Boston, MA, 02114, USA
| | - G Paolo Dotto
- Department of Biochemistry, University of Lausanne, 1066, Epalinges, Switzerland. .,Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, 02129, USA. .,Department of Dermatology, Harvard Medical School, Boston, MA, 02125, USA. .,International Cancer Prevention Institute, 1066, Epalinges, Switzerland.
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9
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Lobo-Pecellín M, Marín-Menguiano M, González-Reyes A. mastermind regulates niche ageing independently of the Notch pathway in the Drosophila ovary. Open Biol 2019; 9:190127. [PMID: 31744422 PMCID: PMC6893403 DOI: 10.1098/rsob.190127] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Proper stem cell activity in tissues ensures the correct balance between proliferation and differentiation, thus allowing tissue homeostasis and repair. The Drosophila ovary develops well-defined niches that contain on average 2–4 germline stem cells (GSCs), whose maintenance depends on systemic signals and local factors. A known player in the decline of tissue homeostasis is ageing, which correlates with the waning of resident stem cell populations. In Drosophila, ovaries from old females contain fewer GSCs than those from young flies. We isolated niche cells of aged ovaries, performed a transcriptomic analysis and identified mastermind (mam) as a factor for Drosophila ovarian niche functionality during ageing. We show that mam is upregulated in aged niche cells and that we can induce premature GSC loss by overexpressing mam in otherwise young niche cells. High mam levels in niche cells induce reduced Hedgehog amounts, a decrease in cadherin levels and a likely increase in reactive oxygen species, three scenarios known to provoke GSC loss. Mam is a canonical co-activator of the Notch pathway in many Drosophila tissues. However, we present evidence to support a Notch-independent role for mam in the ovarian germline niche.
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Affiliation(s)
- María Lobo-Pecellín
- Centro Andaluz de Biología del Desarrollo, CSIC/Universidad Pablo de Olavide/JA, Carretera de Utrera km 1, 41013 Sevilla, Spain
| | - Miriam Marín-Menguiano
- Centro Andaluz de Biología del Desarrollo, CSIC/Universidad Pablo de Olavide/JA, Carretera de Utrera km 1, 41013 Sevilla, Spain
| | - Acaimo González-Reyes
- Centro Andaluz de Biología del Desarrollo, CSIC/Universidad Pablo de Olavide/JA, Carretera de Utrera km 1, 41013 Sevilla, Spain
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10
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Complementary Activity of ETV5, RBPJ, and TCF3 Drives Formative Transition from Naive Pluripotency. Cell Stem Cell 2019; 24:785-801.e7. [PMID: 31031137 PMCID: PMC6509416 DOI: 10.1016/j.stem.2019.03.017] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 11/01/2018] [Accepted: 03/21/2019] [Indexed: 02/02/2023]
Abstract
The gene regulatory network (GRN) of naive mouse embryonic stem cells (ESCs) must be reconfigured to enable lineage commitment. TCF3 sanctions rewiring by suppressing components of the ESC transcription factor circuitry. However, TCF3 depletion only delays and does not prevent transition to formative pluripotency. Here, we delineate additional contributions of the ETS-family transcription factor ETV5 and the repressor RBPJ. In response to ERK signaling, ETV5 switches activity from supporting self-renewal and undergoes genome relocation linked to commissioning of enhancers activated in formative epiblast. Independent upregulation of RBPJ prevents re-expression of potent naive factors, TBX3 and NANOG, to secure exit from the naive state. Triple deletion of Etv5, Rbpj, and Tcf3 disables ESCs, such that they remain largely undifferentiated and locked in self-renewal, even in the presence of differentiation stimuli. Thus, genetic elimination of three complementary drivers of network transition stalls developmental progression, emulating environmental insulation by small-molecule inhibitors.
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11
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White EA. Manipulation of Epithelial Differentiation by HPV Oncoproteins. Viruses 2019; 11:v11040369. [PMID: 31013597 PMCID: PMC6549445 DOI: 10.3390/v11040369] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 04/18/2019] [Accepted: 04/20/2019] [Indexed: 02/06/2023] Open
Abstract
Papillomaviruses replicate and cause disease in stratified squamous epithelia. Epithelial differentiation is essential for the progression of papillomavirus replication, but differentiation is also impaired by papillomavirus-encoded proteins. The papillomavirus E6 and E7 oncoproteins partially inhibit and/or delay epithelial differentiation and some of the mechanisms by which they do so are beginning to be defined. This review will outline the key features of the relationship between HPV infection and differentiation and will summarize the data indicating that papillomaviruses alter epithelial differentiation. It will describe what is known so far and will highlight open questions about the differentiation-inhibitory mechanisms employed by the papillomaviruses.
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Affiliation(s)
- Elizabeth A White
- Department of Otorhinolaryngology: Head and Neck Surgery, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA.
- Department of Microbiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA.
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12
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Genome-Wide Identification of Direct RTA Targets Reveals Key Host Factors for Kaposi's Sarcoma-Associated Herpesvirus Lytic Reactivation. J Virol 2019; 93:JVI.01978-18. [PMID: 30541837 DOI: 10.1128/jvi.01978-18] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 11/28/2018] [Indexed: 12/28/2022] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is a human oncogenic virus, which maintains the persistent infection of the host by intermittently reactivating from latently infected cells to produce viral progenies. While it is established that the replication and transcription activator (RTA) viral transcription factor is required for the induction of lytic viral genes for KSHV lytic reactivation, it is still unknown to what extent RTA alters the host transcriptome to promote KSHV lytic cycle and viral pathogenesis. To address this question, we performed a comprehensive time course transcriptome analysis during KSHV reactivation in B-cell lymphoma cells and determined RTA-binding sites on both the viral and host genomes, which resulted in the identification of the core RTA-induced host genes (core RIGs). We found that the majority of RTA-binding sites at core RIGs contained the canonical RBP-Jκ-binding DNA motif. Subsequently, we demonstrated the vital role of the Notch signaling transcription factor RBP-Jκ for RTA-driven rapid host gene induction, which is consistent with RBP-Jκ being essential for KSHV lytic reactivation. Importantly, many of the core RIGs encode plasma membrane proteins and key regulators of signaling pathways and cell death; however, their contribution to the lytic cycle is largely unknown. We show that the cell cycle and chromatin regulator geminin and the plasma membrane protein gamma-glutamyltransferase 6, two of the core RIGs, are required for efficient KSHV reactivation and virus production. Our results indicate that host genes that RTA rapidly and directly induces can be pivotal for driving the KSHV lytic cycle.IMPORTANCE The lytic cycle of KSHV is involved not only in the dissemination of the virus but also viral oncogenesis, in which the effect of RTA on the host transcriptome is still unclear. Using genomics approaches, we identified a core set of host genes which are rapidly and directly induced by RTA in the early phase of KSHV lytic reactivation. We found that RTA does not need viral cofactors but requires its host cofactor RBP-Jκ for inducing many of its core RIGs. Importantly, we show a critical role for two of the core RIGs in efficient lytic reactivation and replication, highlighting their significance in the KSHV lytic cycle. We propose that the unbiased identification of RTA-induced host genes can uncover potential therapeutic targets for inhibiting KSHV replication and viral pathogenesis.
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13
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Harbuzariu A, Oprea-Ilies GM, Gonzalez-Perez RR. The Role of Notch Signaling and Leptin-Notch Crosstalk in Pancreatic Cancer. MEDICINES (BASEL, SWITZERLAND) 2018; 5:medicines5030068. [PMID: 30004402 PMCID: PMC6164868 DOI: 10.3390/medicines5030068] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 06/27/2018] [Accepted: 06/29/2018] [Indexed: 02/06/2023]
Abstract
There is accumulating evidence that deregulated Notch signaling affects cancer development, and specifically pancreatic cancer (PC) progression. Notch canonical and non-canonical signaling has diverse impact on PC. Moreover, the actions of RBP-Jk (nuclear partner of activated Notch) independent of Notch signaling pathway seem to affect differently cancer progression. Recent data show that in PC and other cancer types the adipokine leptin can modulate Notch/RBP-Jk signaling, thereby, linking the pandemic obesity with cancer and chemoresistance. The potential pivotal role of leptin on PC, and its connection with Notch signaling and chemoresistance are still not completely understood. In this review, we will describe the most important aspects of Notch-RBP-Jk signaling in PC. Further, we will discuss on studies related to RBP-Jk-independent Notch and Notch-independent RPB-Jk signaling. We will also discuss on the novel crosstalk between leptin and Notch in PC and its implications in chemoresistance. The effects of leptin-Notch/RBP-Jk signaling on cancer cell proliferation, apoptosis, and drug resistance require more investigation. Data from these investigations could help to open unexplored ways to improve PC treatment success that has shown little progress for many years.
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Affiliation(s)
- Adriana Harbuzariu
- Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA 30310, USA.
| | | | - Ruben R Gonzalez-Perez
- Department of Microbiology, Biochemistry and Immunology, Morehouse School of Medicine, Atlanta, GA 30310, USA.
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14
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Al Labban D, Jo SH, Ostano P, Saglietti C, Bongiovanni M, Panizzon R, Dotto GP. Notch-effector CSL promotes squamous cell carcinoma by repressing histone demethylase KDM6B. J Clin Invest 2018; 128:2581-2599. [PMID: 29757189 DOI: 10.1172/jci96915] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 03/20/2018] [Indexed: 12/19/2022] Open
Abstract
Notch 1/2 genes play tumor-suppressing functions in squamous cell carcinoma (SCC), a very common malignancy in skin and internal organs. In contrast with Notch, we show that the transcription factor CSL (also known as RBP-Jκ), a key effector of canonical Notch signaling endowed with intrinsic transcription-repressive functions, plays a tumor-promoting function in SCC development. Expression of this gene decreased in upper epidermal layers and human keratinocytes (HKCs) undergoing differentiation, while it increased in premalignant and malignant SCC lesions from skin, head/neck, and lung. Increased CSL levels enhanced the proliferative potential of HKCs and SCC cells, while silencing of CSL induced growth arrest and apoptosis. In vivo, SCC cells with increased CSL levels gave rise to rapidly expanding tumors, while cells with silenced CSL formed smaller and more differentiated tumors with enhanced inflammatory infiltrate. Global transcriptomic analysis of HKCs and SCC cells with silenced CSL revealed major modulation of apoptotic, cell-cycle, and proinflammatory genes. We also show that the histone demethylase KDM6B is a direct CSL-negative target, with inverse roles of CSL in HKC and SCC proliferative capacity, tumorigenesis, and tumor-associated inflammatory reaction. CSL/KDM6B protein expression could be used as a biomarker of SCC development and indicator of cancer treatment.
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Affiliation(s)
- Dania Al Labban
- Department of Biochemistry, University of Lausanne, Epalinges, Switzerland
| | - Seung-Hee Jo
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, Massachusetts, USA
| | - Paola Ostano
- Cancer Genomics Laboratory, Edo and Elvo Tempia Valenta Foundation, Biella, Italy
| | | | | | - Renato Panizzon
- Department of Dermatology, Lausanne University Hospital (CHUV), Lausanne, Switzerland
| | - G Paolo Dotto
- Department of Biochemistry, University of Lausanne, Epalinges, Switzerland.,Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, Massachusetts, USA
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15
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Chang CH, Liu YT, Weng SC, Chen IY, Tsao PN, Shiao SH. The non-canonical Notch signaling is essential for the control of fertility in Aedes aegypti. PLoS Negl Trop Dis 2018; 12:e0006307. [PMID: 29505577 PMCID: PMC5854436 DOI: 10.1371/journal.pntd.0006307] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Revised: 03/15/2018] [Accepted: 02/08/2018] [Indexed: 01/03/2023] Open
Abstract
The Notch signaling pathway is a highly evolutionarily-conserved cell-cell signaling pathway that regulates many events during development. It plays a pivotal role in the regulation of fundamental cellular processes, such as cell proliferation, stem cell maintenance, and differentiation during embryonic and adult development. However, functions of Notch signaling in Aedes aegypti, the major mosquito vector for dengue, are largely unknown. In this study, we identified a unique feature of A. aegypti Notch (AaNotch) in the control of the sterile-like phenotype in female mosquitoes. Silencing AaNotch with a reverse genetic approach significantly reduced the fecundity and fertility of the mosquito. Silencing AaNotch also resulted in the prevention of micropyle formation, which led to impaired fertilization. In addition, JNK phosphorylation (a signaling molecule in the non-canonical Notch signaling pathway) was inhibited in the absence of AaNotch. Furthermore, treatment with a JNK inhibitor in the mosquito resulted in impaired fecundity and fertility. Taken together, our results demonstrate that non-canonical Notch signaling is essential for controlling fertility in the A. aegypti mosquito.
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Affiliation(s)
- Chia-Hao Chang
- Department of Parasitology, National Taiwan University, Taipei, Taiwan
| | - Yu-Ting Liu
- Department of Parasitology, National Taiwan University, Taipei, Taiwan
| | - Shih-Che Weng
- Department of Parasitology, National Taiwan University, Taipei, Taiwan
| | - I-Yi Chen
- Department of Parasitology, National Taiwan University, Taipei, Taiwan
| | - Po-Nien Tsao
- Department of Pediatrics, National Taiwan University Hospital, Taipei, Taiwan
- Research Center for Developmental Biology & Regeneration Medicine, National Taiwan University, Taipei, Taiwan
| | - Shin-Hong Shiao
- Department of Parasitology, National Taiwan University, Taipei, Taiwan
- * E-mail:
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16
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Jo SH, Kim DE, Clocchiatti A, Dotto GP. PDCD4 is a CSL associated protein with a transcription repressive function in cancer associated fibroblast activation. Oncotarget 2018; 7:58717-58727. [PMID: 27542230 PMCID: PMC5312270 DOI: 10.18632/oncotarget.11227] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 07/22/2016] [Indexed: 11/25/2022] Open
Abstract
The Notch/CSL pathway plays an important role in skin homeostasis and carcinogenesis. CSL, the key effector of canonical Notch signaling endowed with an intrinsic transcription repressive function, suppresses stromal fibroblast senescence and Cancer Associated Fibroblast (CAF) activation through direct down-modulation of key effector genes. Interacting proteins that participate with CSL in this context are as yet to be identified. We report here that Programmed Cell Death 4 (PDCD4), a nuclear/cytoplasmic shuttling protein with multiple functions, associates with CSL and plays a similar role in suppressing dermal fibroblast senescence and CAF activation. Like CSL, PDCD4 is down-regulated in stromal fibroblasts of premalignant skin actinic keratosis (AKs) lesions and squamous cell carcinoma (SCC). While devoid of intrinsic DNA binding capability, PDCD4 is present at CSL binding sites of CAF marker genes as well as canonical Notch/CSL targets and suppresses expression of these genes in a fibroblast-specific manner. Thus, we propose that PDCD4 is part of the CSL repressive complex involved in negative control of stromal fibroblasts conversion into CAFs.
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Affiliation(s)
- Seung-Hee Jo
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, USA.,Department of Dermatology, Harvard Medical School, Boston, MA, USA
| | - Dong Eun Kim
- Department of Biochemistry, University of Lausanne, Epalinges, CH, Switzerland
| | - Andrea Clocchiatti
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, USA.,Department of Dermatology, Harvard Medical School, Boston, MA, USA
| | - G Paolo Dotto
- Cutaneous Biology Research Center, Massachusetts General Hospital, Charlestown, MA, USA.,Department of Biochemistry, University of Lausanne, Epalinges, CH, Switzerland
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17
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Zhang D, Gates KP, Barske L, Wang G, Lancman JJ, Zeng XXI, Groff M, Wang K, Parsons MJ, Crump JG, Dong PDS. Endoderm Jagged induces liver and pancreas duct lineage in zebrafish. Nat Commun 2017; 8:769. [PMID: 28974684 PMCID: PMC5626745 DOI: 10.1038/s41467-017-00666-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 07/15/2017] [Indexed: 12/17/2022] Open
Abstract
Liver duct paucity is characteristic of children born with Alagille Syndrome (ALGS), a disease associated with JAGGED1 mutations. Here, we report that zebrafish embryos with compound homozygous mutations in two Notch ligand genes, jagged1b (jag1b) and jagged2b (jag2b) exhibit a complete loss of canonical Notch activity and duct cells within the liver and exocrine pancreas, whereas hepatocyte and acinar pancreas development is not affected. Further, animal chimera studies demonstrate that wild-type endoderm cells within the liver and pancreas can rescue Notch activity and duct lineage specification in adjacent cells lacking jag1b and jag2b expression. We conclude that these two Notch ligands are directly and solely responsible for all duct lineage specification in these organs in zebrafish. Our study uncovers genes required for lineage specification of the intrahepatopancreatic duct cells, challenges the role of duct cells as progenitors, and suggests a genetic mechanism for ALGS ductal paucity.The hepatopancreatic duct cells connect liver hepatocytes and pancreatic acinar cells to the intestine, but the mechanism for their lineage specification is unclear. Here, the authors reveal that Notch ligands Jagged1b and Jagged2b induce duct cell lineage in the liver and pancreas of the zebrafish.
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Affiliation(s)
- Danhua Zhang
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
- Graduate School of Biomedical, Science, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Keith P Gates
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Lindsey Barske
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of University of Southern California, Los Angeles, CA, 90033, USA
| | - Guangliang Wang
- Department of Surgery, and McKusick-Nathans Institute for Genetic Medicine, Johns Hopkins University School of Medicine, 733N. Broadway, Baltimore, MD, 21205, USA
| | - Joseph J Lancman
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Xin-Xin I Zeng
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Megan Groff
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of University of Southern California, Los Angeles, CA, 90033, USA
| | - Kasper Wang
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of University of Southern California, Los Angeles, CA, 90033, USA
| | - Michael J Parsons
- Department of Surgery, and McKusick-Nathans Institute for Genetic Medicine, Johns Hopkins University School of Medicine, 733N. Broadway, Baltimore, MD, 21205, USA
| | - J Gage Crump
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of University of Southern California, Los Angeles, CA, 90033, USA
| | - P Duc Si Dong
- Human Genetics Program, Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA.
- Graduate School of Biomedical, Science, 10901 North Torrey Pines Road, La Jolla, CA, 92037, USA.
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18
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Siebel C, Lendahl U. Notch Signaling in Development, Tissue Homeostasis, and Disease. Physiol Rev 2017; 97:1235-1294. [PMID: 28794168 DOI: 10.1152/physrev.00005.2017] [Citation(s) in RCA: 587] [Impact Index Per Article: 83.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 05/19/2017] [Accepted: 05/26/2017] [Indexed: 02/07/2023] Open
Abstract
Notch signaling is an evolutionarily highly conserved signaling mechanism, but in contrast to signaling pathways such as Wnt, Sonic Hedgehog, and BMP/TGF-β, Notch signaling occurs via cell-cell communication, where transmembrane ligands on one cell activate transmembrane receptors on a juxtaposed cell. Originally discovered through mutations in Drosophila more than 100 yr ago, and with the first Notch gene cloned more than 30 yr ago, we are still gaining new insights into the broad effects of Notch signaling in organisms across the metazoan spectrum and its requirement for normal development of most organs in the body. In this review, we provide an overview of the Notch signaling mechanism at the molecular level and discuss how the pathway, which is architecturally quite simple, is able to engage in the control of cell fates in a broad variety of cell types. We discuss the current understanding of how Notch signaling can become derailed, either by direct mutations or by aberrant regulation, and the expanding spectrum of diseases and cancers that is a consequence of Notch dysregulation. Finally, we explore the emerging field of Notch in the control of tissue homeostasis, with examples from skin, liver, lung, intestine, and the vasculature.
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Affiliation(s)
- Chris Siebel
- Department of Discovery Oncology, Genentech Inc., DNA Way, South San Francisco, California; and Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden
| | - Urban Lendahl
- Department of Discovery Oncology, Genentech Inc., DNA Way, South San Francisco, California; and Department of Cell and Molecular Biology, Karolinska Institute, Stockholm, Sweden
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19
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Transcriptional Maintenance of Pancreatic Acinar Identity, Differentiation, and Homeostasis by PTF1A. Mol Cell Biol 2016; 36:3033-3047. [PMID: 27697859 DOI: 10.1128/mcb.00358-16] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 09/23/2016] [Indexed: 12/17/2022] Open
Abstract
Maintenance of cell type identity is crucial for health, yet little is known of the regulation that sustains the long-term stability of differentiated phenotypes. To investigate the roles that key transcriptional regulators play in adult differentiated cells, we examined the effects of depletion of the developmental master regulator PTF1A on the specialized phenotype of the adult pancreatic acinar cell in vivo Transcriptome sequencing and chromatin immunoprecipitation sequencing results showed that PTF1A maintains the expression of genes for all cellular processes dedicated to the production of the secretory digestive enzymes, a highly attuned surveillance of unfolded proteins, and a heightened unfolded protein response (UPR). Control by PTF1A is direct on target genes and indirect through a ten-member transcription factor network. Depletion of PTF1A causes an imbalance that overwhelms the UPR, induces cellular injury, and provokes acinar metaplasia. Compromised cellular identity occurs by derepression of characteristic stomach genes, some of which are also associated with pancreatic ductal cells. The loss of acinar cell homeostasis, differentiation, and identity is directly relevant to the pathologies of pancreatitis and pancreatic adenocarcinoma.
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20
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Safdar K, Gu A, Xu X, Au V, Taylor J, Flibotte S, Moerman DG, Maine EM. UBR-5, a Conserved HECT-Type E3 Ubiquitin Ligase, Negatively Regulates Notch-Type Signaling in Caenorhabditis elegans. G3 (BETHESDA, MD.) 2016; 6:2125-34. [PMID: 27185398 PMCID: PMC4938665 DOI: 10.1534/g3.116.027805] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 05/09/2016] [Indexed: 12/17/2022]
Abstract
Notch-type signaling mediates cell-cell interactions important for animal development. In humans, reduced or inappropriate Notch signaling activity is associated with various developmental defects and disease states, including cancers. Caenorhabditis elegans expresses two Notch-type receptors, GLP-1 and LIN-12. GLP-1 mediates several cell-signaling events in the embryo and promotes germline proliferation in the developing and adult gonad. LIN-12 acts redundantly with GLP-1 in certain inductive events in the embryo and mediates several cell-cell interactions during larval development. Recovery of genetic suppressors and enhancers of glp-1 or lin-12 loss- or gain-of-function mutations has identified numerous regulators of GLP-1 and LIN-12 signaling activity. Here, we report the molecular identification of sog-1, a gene identified in screens for recessive suppressors of conditional glp-1 loss-of-function mutations. The sog-1 gene encodes UBR-5, the sole C. elegans member of the UBR5/Hyd family of HECT-type E3 ubiquitin ligases. Molecular and genetic analyses indicate that the loss of ubr-5 function suppresses defects caused by reduced signaling via GLP-1 or LIN-12. In contrast, ubr-5 mutations do not suppress embryonic or larval lethality associated with mutations in a downstream transcription factor, LAG-1. In the gonad, ubr-5 acts in the receiving cells (germ cells) to limit GLP-1 signaling activity. SEL-10 is the F-box component of SCF(SEL-10) E3 ubiquitin-ligase complex that promotes turnover of Notch intracellular domain. UBR-5 acts redundantly with SEL-10 to limit Notch signaling in certain tissues. We hypothesize that UBR-5 activity limits Notch-type signaling by promoting turnover of receptor or limiting its interaction with pathway components.
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Affiliation(s)
- Komal Safdar
- Department of Biology, Syracuse University, New York 13244
| | - Anniya Gu
- Department of Biology, Syracuse University, New York 13244
| | - Xia Xu
- Department of Biology, Syracuse University, New York 13244
| | - Vinci Au
- Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Jon Taylor
- Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Stephane Flibotte
- Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
| | - Donald G Moerman
- Department of Zoology, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
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21
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Díaz-Trelles R, Scimia MC, Bushway P, Tran D, Monosov A, Monosov E, Peterson K, Rentschler S, Cabrales P, Ruiz-Lozano P, Mercola M. Notch-independent RBPJ controls angiogenesis in the adult heart. Nat Commun 2016; 7:12088. [PMID: 27357444 PMCID: PMC4931341 DOI: 10.1038/ncomms12088] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 05/26/2016] [Indexed: 12/05/2022] Open
Abstract
Increasing angiogenesis has long been considered a therapeutic target for improving heart function after injury such as acute myocardial infarction. However, gene, protein and cell therapies to increase microvascularization have not been successful, most likely because the studies failed to achieve regulated and concerted expression of pro-angiogenic and angiostatic factors needed to produce functional microvasculature. Here, we report that the transcription factor RBPJ is a homoeostatic repressor of multiple pro-angiogenic and angiostatic factor genes in cardiomyocytes. RBPJ controls angiogenic factor gene expression independently of Notch by antagonizing the activity of hypoxia-inducible factors (HIFs). In contrast to previous strategies, the cardiomyocyte-specific deletion of Rbpj increased microvascularization of the heart without adversely affecting cardiac structure or function even into old age. Furthermore, the loss of RBPJ in cardiomyocytes increased hypoxia tolerance, improved heart function and decreased pathological remodelling after myocardial infarction, suggesting that inhibiting RBPJ might be therapeutic for ischaemic injury.
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Affiliation(s)
- Ramón Díaz-Trelles
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
- Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California 92093 USA
| | - Maria Cecilia Scimia
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
- Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California 92093 USA
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, California 92093 USA
| | - Paul Bushway
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
- Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California 92093 USA
| | - Danh Tran
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
| | - Anna Monosov
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
| | - Edward Monosov
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
| | - Kirk Peterson
- Division of Cardiology, Department of Medicine, University of California, San Diego, La Jolla, California 92093 USA
| | - Stacey Rentschler
- Departments of Medicine, Developmental Biology and Biomedical Engineering, Washington University, St Louis, Missouri 63110 USA
| | - Pedro Cabrales
- Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California 92093 USA
| | - Pilar Ruiz-Lozano
- Department of Pediatrics, Stanford University, Stanford, California 94305 USA
| | - Mark Mercola
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California 92037, USA
- Department of Bioengineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, California 92093 USA
- Stanford Cardiovascular Institute and Department of Medicine, Stanford University, Stanford, California 94305, USA
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22
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Aujla PK, Bogdanovic V, Naratadam GT, Raetzman LT. Persistent expression of activated notch in the developing hypothalamus affects survival of pituitary progenitors and alters pituitary structure. Dev Dyn 2016; 244:921-34. [PMID: 25907274 DOI: 10.1002/dvdy.24283] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 04/10/2015] [Accepted: 04/13/2015] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND As the pituitary gland develops, signals from the hypothalamus are necessary for pituitary induction and expansion. Little is known about the control of cues that regulate early signaling between the two structures. Ligands and receptors of the Notch signaling pathway are found in both the hypothalamus and Rathke's pouch. The downstream Notch effector gene Hes1 is required for proper pituitary formation; however, these effects could be due to the action of Hes1 in the hypothalamus, Rathke's pouch, or both. To determine the contribution of hypothalamic Notch signaling to pituitary organogenesis, we used mice with loss and gain of Notch function within the developing hypothalamus. RESULTS We demonstrate that loss of Notch signaling by conditional deletion of Rbpj in the hypothalamus does not affect expression of Hes1 within the posterior hypothalamus or expression of Hes5. In contrast, expression of activated Notch within the hypothalamus results in ectopic Hes5 expression and increased Hes1 expression, which is sufficient to disrupt pituitary development and postnatal expansion. CONCLUSIONS Taken together, our results indicate that Rbpj-dependent Notch signaling within the developing hypothalamus is not necessary for pituitary development, but persistent Notch signaling and ectopic Hes5 expression in hypothalamic progenitors affects pituitary induction and expansion.
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Affiliation(s)
- Paven K Aujla
- Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Vedran Bogdanovic
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - George T Naratadam
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Lori T Raetzman
- Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, Illinois.,Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, Illinois
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23
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Stalin J, Harhouri K, Hubert L, Garrigue P, Nollet M, Essaadi A, Muller A, Foucault-Bertaud A, Bachelier R, Sabatier F, Pisano P, Peiretti F, Leroyer AS, Guillet B, Bardin N, Dignat-George F, Blot-Chabaud M. Soluble CD146 boosts therapeutic effect of endothelial progenitors through proteolytic processing of short CD146 isoform. Cardiovasc Res 2016; 111:240-51. [PMID: 27170199 DOI: 10.1093/cvr/cvw096] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Accepted: 04/27/2016] [Indexed: 01/12/2023] Open
Abstract
AIMS Endothelial colony-forming cells (ECFC) constitute an endothelial progenitor fraction with a promising interest for the treatment of ischaemic cardiovascular diseases. As soluble CD146 (sCD146) is a new factor promoting angiogenesis, we examined whether sCD146 priming could improve the therapeutic potential of ECFC and defined the involved mechanism. METHODS AND RESULTS We investigated the effects of sCD146 priming on regenerative properties of ECFC in vivo. In a mouse model of hindlimb ischaemia, the homing of radiolabelled cells to ischaemic tissue was assessed by SPECT-CT imaging. Soluble CD146 priming did not modify the number of engrafted ECFC but improved their survival capacity, leading to an enhanced revascularization. The mechanism of action of sCD146 on ECFC was studied in vitro. We showed that sCD146 acts in ECFC through a signalosome, located in lipid rafts, containing angiomotin, the short isoform of CD146 (shCD146), VEGFR1, VEGFR2, and presenilin-1. Soluble CD146 induced a sequential proteolytic cleavage of shCD146, with an extracellular shedding followed by an intramembrane cleavage mediated by matrix metalloprotease (MMP)/ADAM and presenilin-1, respectively. The generated intracellular part of shCD146 was directed towards the nucleus where it associated with the transcription factor CSL and modulated the transcription of genes involved in cell survival (FADD, Bcl-xl) and angiogenesis (eNOS). This effect was dependent on both VEGFR1 and VEGFR2, which were rapidly phosphorylated by sCD146. CONCLUSIONS These findings establish that activation of the proteolytic processing of shCD146, in particular by sCD146, constitutes a promising pathway to improve endothelial progenitors' regenerative properties for the treatment of cardiovascular diseases.
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Affiliation(s)
- Jimmy Stalin
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Karim Harhouri
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Lucas Hubert
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Philippe Garrigue
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France CERIMED (European Center of Research in Medical Imaging), Aix-Marseille University, Marseille, France
| | - Marie Nollet
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Amel Essaadi
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Alexandre Muller
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | | | - Richard Bachelier
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Florence Sabatier
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France Laboratory of Culture and Cell Therapy, INSERM CIC-BT510, CHU Conception, Marseille, France
| | - Pascale Pisano
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Franck Peiretti
- INSERM UMR-S 1062, Aix-Marseille University, Marseille, France
| | - Aurélie S Leroyer
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Benjamin Guillet
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France CERIMED (European Center of Research in Medical Imaging), Aix-Marseille University, Marseille, France
| | - Nathalie Bardin
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Françoise Dignat-George
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
| | - Marcel Blot-Chabaud
- INSERM UMR-S 1076, Aix-Marseille University, UFR Pharmacy, 27 Bd J. Moulin, 13005 Marseille, France
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24
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Menietti E, Xu X, Ostano P, Joseph JM, Lefort K, Dotto GP. Negative control of CSL gene transcription by stress/DNA damage response and p53. Cell Cycle 2016; 15:1767-78. [PMID: 27163456 DOI: 10.1080/15384101.2016.1186317] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
CSL is a key transcriptional repressor and mediator of Notch signaling. Despite wide interest in CSL, mechanisms responsible for its own regulation are little studied. CSL down-modulation in human dermal fibroblasts (HDFs) leads to conversion into cancer associated fibroblasts (CAF), promoting keratinocyte tumors. We show here that CSL transcript levels differ among HDF strains from different individuals, with negative correlation with genes involved in DNA damage/repair. CSL expression is negatively regulated by stress/DNA damage caused by UVA, Reactive Oxygen Species (ROS), smoke extract, and doxorubicin treatment. P53, a key effector of the DNA damage response, negatively controls CSL gene transcription, through suppression of CSL promoter activity and, indirectly, by increased p21 expression. CSL was previously shown to bind p53 suppressing its activity. The present findings indicate that p53, in turn, decreases CSL expression, which can serve to enhance p53 activity in acute DNA damage response of cells.
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Affiliation(s)
- Elena Menietti
- a Department of Biochemistry , University of Lausanne , Epalinges , Switzerland
| | - Xiaoying Xu
- a Department of Biochemistry , University of Lausanne , Epalinges , Switzerland
| | - Paola Ostano
- b Cancer Genomics Laboratory, Edo and Elvo Tempia Valenta Foundation , Biella , Italy
| | - Jean-Marc Joseph
- c Pediatric surgery Department , University Hospital CHUV , Lausanne , Switzerland
| | - Karine Lefort
- a Department of Biochemistry , University of Lausanne , Epalinges , Switzerland.,d Department of Dermatology , University Hospital CHUV , Lausanne , Switzerland
| | - G Paolo Dotto
- a Department of Biochemistry , University of Lausanne , Epalinges , Switzerland.,e Cutaneous Biology Research Center, Massachusetts General Hospital , Charlestown , MA , USA
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25
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Campbell DP, Chrysostomou E, Doetzlhofer A. Canonical Notch signaling plays an instructive role in auditory supporting cell development. Sci Rep 2016; 6:19484. [PMID: 26786414 PMCID: PMC4726253 DOI: 10.1038/srep19484] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 12/14/2015] [Indexed: 02/07/2023] Open
Abstract
The auditory sensory epithelium, composed of mechano-sensory hair cells (HCs) and highly specialized glial-like supporting cells (SCs), is critical for our ability to detect sound. SCs provide structural and functional support to HCs and play an essential role in cochlear development, homeostasis and repair. Despite their importance, however, surprisingly little is known about the molecular mechanisms guiding SC differentiation. Here, we provide evidence that in addition to its well-characterized inhibitory function, canonical Notch signaling plays a positive, instructive role in the differentiation of SCs. Using γ-secretase inhibitor DAPT to acutely block canonical Notch signaling, we identified a cohort of Notch-regulated SC-specific genes, with diverse functions in cell signaling, cell differentiation, neuronal innervation and synaptogenesis. We validated the newly identified Notch-regulated genes in vivo using genetic gain (Emx2Cre/+; Rosa26N1ICD/+) and loss-of-function approaches (Emx2Cre/+; Rosa26DnMAML1/+). Furthermore, we demonstrate that Notch over-activation in the differentiating murine cochlea (Emx2Cre/+; Rosa26N1ICD/+) actively promotes a SC-specific gene expression program. Finally, we show that outer SCs –so called Deiters’ cells are selectively lost by prolonged reduction (Emx2Cre/+; Rosa26DnMAML1/+/+) or abolishment of canonical Notch signaling (Fgfr3-iCreER; Rbpj−/Δ), indicating a critical role for Notch signaling in Deiters’ cell development.
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Affiliation(s)
- Dean P Campbell
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA.,Center for Sensory Biology, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA
| | - Elena Chrysostomou
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA.,Center for Sensory Biology, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA
| | - Angelika Doetzlhofer
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA.,Center for Sensory Biology, Johns Hopkins University, School of Medicine Baltimore, MD 21205, USA
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26
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Combined CSL and p53 downregulation promotes cancer-associated fibroblast activation. Nat Cell Biol 2015; 17:1193-204. [PMID: 26302407 PMCID: PMC4699446 DOI: 10.1038/ncb3228] [Citation(s) in RCA: 163] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Accepted: 07/20/2015] [Indexed: 12/13/2022]
Abstract
Stromal fibroblast senescence has been linked to aging-associated cancer risk. However, density and proliferation of cancer-associated fibroblasts (CAF) are frequently increased. Loss or down-modulation of the Notch effector CSL/RBP-Jκ in dermal fibroblasts is sufficient for CAF activation and ensuing keratinocyte-derived tumors. We report that CSL silencing induces senescence of primary fibroblasts from dermis, oral mucosa, breast and lung. CSL functions in these cells as direct repressor of multiple senescence- and CAF-effector genes. It also physically interacts with p53, repressing its activity. CSL is down-modulated in stromal fibroblasts of premalignant skin actinic keratosis lesions and squamous cell carcinomas (SCC), while p53 expression and function is down-modulated only in the latter, with paracrine FGF signaling as likely culprit. Concomitant loss of CSL and p53 overcomes fibroblast senescence, enhances expression of CAF effectors and promotes stromal and cancer cell expansion. The findings support a CAF activation/stromal co-evolution model under convergent CSL/p53 control.
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27
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Uterine Rbpj is required for embryonic-uterine orientation and decidual remodeling via Notch pathway-independent and -dependent mechanisms. Cell Res 2014; 24:925-42. [PMID: 24971735 PMCID: PMC4123295 DOI: 10.1038/cr.2014.82] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/14/2014] [Accepted: 05/13/2014] [Indexed: 12/29/2022] Open
Abstract
Coordinated uterine-embryonic axis formation and decidual remodeling are hallmarks of mammalian post-implantation embryo development. Embryonic-uterine orientation is determined at initial implantation and synchronized with decidual development. However, the molecular mechanisms controlling these events remain elusive despite its discovery a long time ago. In the present study, we found that uterine-specific deletion of Rbpj, the nuclear transducer of Notch signaling, resulted in abnormal embryonic-uterine orientation and decidual patterning at post-implantation stages, leading to substantial embryo loss. We further revealed that prior to embryo attachment, Rbpj confers on-time uterine lumen shape transformation via physically interacting with uterine estrogen receptor (ERα) in a Notch pathway-independent manner, which is essential for the initial establishment of embryo orientation in alignment with uterine axis. While at post-implantation stages, Rbpj directly regulates the expression of uterine matrix metalloproteinase in a Notch pathway-dependent manner, which is required for normal post-implantation decidual remodeling. These results demonstrate that uterine Rbpj is essential for normal embryo development via instructing the initial embryonic-uterine orientation and ensuring normal decidual patterning in a stage-specific manner. Our data also substantiate the concept that normal mammalian embryonic-uterine orientation requires proper guidance from developmentally controlled uterine signaling.
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28
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Abstract
The Notch signalling pathway is evolutionarily conserved and is crucial for the development and homeostasis of most tissues. Deregulated Notch signalling leads to various diseases, such as T cell leukaemia, Alagille syndrome and a stroke and dementia syndrome known as CADASIL, and so strategies to therapeutically modulate Notch signalling are of interest. Clinical trials of Notch pathway inhibitors in patients with solid tumours have been reported, and several approaches are under preclinical evaluation. In this Review, we focus on aspects of the pathway that are amenable to therapeutic intervention, diseases that could be targeted and the various Notch pathway modulation strategies that are currently being explored.
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29
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Velicky P, Haider S, Otti GR, Fiala C, Pollheimer J, Knöfler M. Notch-dependent RBPJκ inhibits proliferation of human cytotrophoblasts and their differentiation into extravillous trophoblasts. Mol Hum Reprod 2014; 20:756-66. [PMID: 24850908 DOI: 10.1093/molehr/gau038] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abnormal development of invasive trophoblasts has been implicated in the pathogenesis of human pregnancy diseases such as pre-eclampsia. However, critical signalling pathways controlling formation and differentiation of these cells have been poorly elucidated. Here, we provide evidence that the canonical Notch pathway, operating through Notch-dependent activation of its key regulatory transcription factor RBPJκ, controls proliferation and differentiation in villous explant cultures and primary trophoblasts of early pregnancy. Immunofluorescence of first trimester placental tissue revealed expression of RBPJκ and its co-activators, the MAML proteins, in nuclei of proliferative cell column trophoblasts (CCT) and differentiated, extravillous trophoblasts (EVTs). However, RBPJκ expression, transcript levels of the Notch target gene HES1 and activity of a Notch/RBPJκ-dependent luciferase reporter decreased during in vitro differentiation of primary cytotrophoblasts on fibronectin. Silencing of RBPJκ using silencing RNAs (siRNAs) increased proliferation of CCTs in floating villous explant cultures analysed by outgrowth and BrdU labelling. Similarly, down-regulation of the transcription factor enhanced BrdU incorporation in isolated primary cultures. However, motility of these cells was not affected. In addition, gene silencing of RBPJκ increased cyclin D1 expression in the two trophoblast model systems as well as markers of the differentiated, EVT, i.e. integrin α1, ADAM12 and T-cell factor 4. In summary, the data suggest that Notch-dependent RBPJκ activity could be required for balanced rates of trophoblast proliferation and differentiation in human placental anchoring villi preventing exaggerated trophoblast overgrowth as well as premature formation of EVTs.
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Affiliation(s)
- P Velicky
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria
| | - S Haider
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria
| | - G R Otti
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria
| | - C Fiala
- Gynmed Clinic, Vienna, Austria
| | - J Pollheimer
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria
| | - M Knöfler
- Department of Obstetrics and Fetal-Maternal Medicine, Reproductive Biology Unit, Medical University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria
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30
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Dotto GP. Multifocal epithelial tumors and field cancerization: stroma as a primary determinant. J Clin Invest 2014; 124:1446-53. [PMID: 24691479 DOI: 10.1172/jci72589] [Citation(s) in RCA: 107] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
It is increasingly evident that cancer results from altered organ homeostasis rather than from deregulated control of single cells or groups of cells. This applies especially to epithelial cancer, the most common form of human solid tumors and a major cause of cancer lethality. In the vast majority of cases, in situ epithelial cancer lesions do not progress into malignancy, even if they harbor many of the genetic changes found in invasive and metastatic tumors. While changes in tumor stroma are frequently viewed as secondary to changes in the epithelium, recent evidence indicates that they can play a primary role in both cancer progression and initiation. These processes may explain the phenomenon of field cancerization, i.e., the occurrence of multifocal and recurrent epithelial tumors that are preceded by and associated with widespread changes of surrounding tissue or organ "fields."
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31
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Discovery of two GLP-1/Notch target genes that account for the role of GLP-1/Notch signaling in stem cell maintenance. Proc Natl Acad Sci U S A 2014; 111:3739-44. [PMID: 24567412 DOI: 10.1073/pnas.1401861111] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A stem cell's immediate microenvironment creates an essential "niche" to maintain stem cell self-renewal. Many niches and their intercellular signaling pathways are known, but for the most part, the key downstream targets of niche signaling remain elusive. Here, we report the discovery of two GLP-1/Notch target genes, lst-1 (lateral signaling target) and sygl-1 (synthetic Glp), that function redundantly to maintain germ-line stem cells (GSCs) in the nematode Caenorhabditis elegans. Whereas lst-1 and sygl-1 single mutants appear normal, lst-1 sygl-1 double mutants are phenotypically indistinguishable from glp-1/Notch mutants. Multiple lines of evidence demonstrate that GLP-1/Notch signaling activates lst-1 and sygl-1 expression in GSCs within the niche. Therefore, these two genes fully account for the role of GLP-1/Notch signaling in GSC maintenance. Importantly, lst-1 and sygl-1 are not required for GLP-1/Notch signaling per se. We conclude that lst-1 and sygl-1 forge a critical link between Notch signaling and GSC maintenance.
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32
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Boyle SC, Liu Z, Kopan R. Notch signaling is required for the formation of mesangial cells from a stromal mesenchyme precursor during kidney development. Development 2013; 141:346-54. [PMID: 24353058 DOI: 10.1242/dev.100271] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Mesangial cells are specialized pericyte/smooth muscle cells that surround and constrain the vascular network within the glomerulus of the kidney. They are derived from the stromal mesenchyme, a progenitor population distinct from nephron stem cells. Whether mesangial cells have a distinct origin from vascular smooth muscle cells (VSMCs) and the pathways that govern their specification are unknown. Here we show that Notch signaling in stromal progenitors is essential for mesangial cell formation but is dispensable for the smooth muscle and interstitial cell lineages. Deletion of RBPjk, the common DNA-binding partner of all active Notch receptors, with Foxd1(tgCre) results in glomerular aneurysm and perinatal death from kidney failure. This defect occurs early in glomerular development as stromal-derived, desmin-positive cells fail to coalesce near forming nephrons and thus do not invade the vascular cleft of the S-shaped body. This is in contrast to other mutants in which the loss of the mesangium was due to migration defects, and suggests that loss of Notch signaling results in a failure to specify this population from the stroma. Interestingly, Pdgfrb-positive VSMCs do not enter the vascular cleft and cannot rescue the mesangial deficiency. Notch1 and Notch2 act redundantly through γ-secretase and RBPjk in this process, as individual mutants have mesangial cells at birth. Together, these data demonstrate a unique origin of mesangial cells and demonstrate a novel, redundant function for Notch receptors in mesangial cell specification, proliferation or survival during kidney development.
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Affiliation(s)
- Scott C Boyle
- Department of Developmental Biology, Washington University School of Medicine, St Louis, MO 63110, USA
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33
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Frank SB, Miranti CK. Disruption of prostate epithelial differentiation pathways and prostate cancer development. Front Oncol 2013; 3:273. [PMID: 24199173 PMCID: PMC3813973 DOI: 10.3389/fonc.2013.00273] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 10/18/2013] [Indexed: 12/14/2022] Open
Abstract
One of the foremost problems in the prostate cancer (PCa) field is the inability to distinguish aggressive from indolent disease, which leads to difficult prognoses and thousands of unnecessary surgeries. This limitation stems from the fact that the mechanisms of tumorigenesis in the prostate are poorly understood. Some genetic alterations are commonly reported in prostate tumors, including upregulation of Myc, fusion of Ets genes to androgen-regulated promoters, and loss of Pten. However, the specific roles of these aberrations in tumor initiation and progression are poorly understood. Likewise, the cell of origin for PCa remains controversial and may be linked to the aggressive potential of the tumor. One important clue is that prostate tumors co-express basal and luminal protein markers that are restricted to their distinct cell types in normal tissue. Prostate epithelium contains layer-specific stem cells as well as rare bipotent cells, which can differentiate into basal or luminal cells. We hypothesize that the primary oncogenic cell of origin is a transient-differentiating bipotent cell. Such a cell must maintain tight temporal and spatial control of differentiation pathways, thus increasing its susceptibility for oncogenic disruption. In support of this hypothesis, many of the pathways known to be involved in prostate differentiation can be linked to genes commonly altered in PCa. In this article, we review what is known about important differentiation pathways (Myc, p38MAPK, Notch, PI3K/Pten) in the prostate and how their misregulation could lead to oncogenesis. Better understanding of normal differentiation will offer new insights into tumor initiation and may help explain the functional significance of common genetic alterations seen in PCa. Additionally, this understanding could lead to new methods for classifying prostate tumors based on their differentiation status and may aid in identifying more aggressive tumors.
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Affiliation(s)
- Sander B Frank
- Laboratory of Integrin Signaling and Tumorigenesis, Van Andel Research Institute , Grand Rapids, MI , USA ; Genetics Graduate Program, Michigan State University , East Lansing, MI , USA
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34
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Aujla PK, Naratadam GT, Xu L, Raetzman LT. Notch/Rbpjκ signaling regulates progenitor maintenance and differentiation of hypothalamic arcuate neurons. Development 2013; 140:3511-21. [PMID: 23884446 DOI: 10.1242/dev.098681] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The hypothalamic arcuate nucleus (Arc), containing pro-opoiomelanocortin (POMC), neuropeptide Y (NPY) and growth hormone releasing hormone (GHRH) neurons, regulates feeding, energy balance and body size. Dysregulation of this homeostatic mediator underlies diseases ranging from growth failure to obesity. Despite considerable investigation regarding the function of Arc neurons, mechanisms governing their development remain unclear. Notch signaling factors such as Hes1 and Mash1 are present in hypothalamic progenitors that give rise to Arc neurons. However, how Notch signaling controls these progenitor populations is unknown. To elucidate the role of Notch signaling in Arc development, we analyzed conditional loss-of-function mice lacking a necessary Notch co-factor, Rbpjκ, in Nkx2.1-cre-expressing cells (Rbpjκ cKO), as well as mice with expression of the constitutively active Notch1 intracellular domain (NICD) in Nkx2.1-cre-expressing cells (NICD Tg). We found that loss of Rbpjκ results in absence of Hes1 but not of Hes5 within the primordial Arc at E13.5. Additionally, Mash1 expression is increased, coincident with increased proliferation and accumulation of Arc neurons at E13.5. At E18.5, Rbpjκ cKO mice have few progenitors and show increased numbers of differentiated Pomc, NPY and Ghrh neurons. By contrast, NICD Tg mice have increased hypothalamic progenitors, show an absence of differentiated Arc neurons and aberrant glial differentiation at E18.5. Subsequently, both Rbpjκ cKO and NICD Tg mice have changes in growth and body size during postnatal development. Taken together, our results demonstrate that Notch/Rbpjκ signaling regulates the generation and differentiation of Arc neurons, which contribute to homeostatic regulation of body size.
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Affiliation(s)
- Paven K Aujla
- University of Illinois at Urbana-Champaign, 407 South Goodwin Avenue, Urbana, IL 61801, USA
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35
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Bröhl D, Vasyutina E, Czajkowski M, Griger J, Rassek C, Rahn HP, Purfürst B, Wende H, Birchmeier C. Colonization of the Satellite Cell Niche by Skeletal Muscle Progenitor Cells Depends on Notch Signals. Dev Cell 2012; 23:469-81. [DOI: 10.1016/j.devcel.2012.07.014] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 06/19/2012] [Accepted: 07/17/2012] [Indexed: 10/28/2022]
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