1
|
Zhao T, Hong Y, Yan B, Huang S, Ming GL, Song H. Epigenetic maintenance of adult neural stem cell quiescence in the mouse hippocampus via Setd1a. Nat Commun 2024; 15:5674. [PMID: 38971831 PMCID: PMC11227589 DOI: 10.1038/s41467-024-50010-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 06/25/2024] [Indexed: 07/08/2024] Open
Abstract
Quiescence, a hallmark of adult neural stem cells (NSCs), is required for maintaining the NSC pool to support life-long continuous neurogenesis in the adult dentate gyrus (DG). Whether long-lasting epigenetic modifications maintain NSC quiescence over the long term in the adult DG is not well-understood. Here we show that mice with haploinsufficiency of Setd1a, a schizophrenia risk gene encoding a histone H3K4 methyltransferase, develop an enlarged DG with more dentate granule cells after young adulthood. Deletion of Setd1a specifically in quiescent NSCs in the adult DG promotes their activation and neurogenesis, which is countered by inhibition of the histone demethylase LSD1. Mechanistically, RNA-sequencing and CUT & RUN analyses of cultured quiescent adult NSCs reveal Setd1a deletion-induced transcriptional changes and many Setd1a targets, among which down-regulation of Bhlhe40 promotes quiescent NSC activation in the adult DG in vivo. Together, our study reveals a Setd1a-dependent epigenetic mechanism that sustains NSC quiescence in the adult DG.
Collapse
Affiliation(s)
- Ting Zhao
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA
| | - Yan Hong
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA
| | - Bowen Yan
- Department of Pharmacology and Therapeutics, College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Suming Huang
- Division of Pediatric Hematology/Oncology, Department of Pediatrics, Pennsylvania State University College of Medicine, Hershey, PA, 17033, USA
| | - Guo-Li Ming
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Institute for Regenerative Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
| | - Hongjun Song
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Institute for Regenerative Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philedaphia, PA, 19104, USA.
- The Epigenetics Institute, Perelman School for Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.
| |
Collapse
|
2
|
Song P, Zhao J, Zhang W, Li X, Ji B, Zhao J. Vitamin a potentiates sheep myoblasts myogenic differentiation through BHLHE40-modulated ID3 expression. BMC Genomics 2024; 25:244. [PMID: 38443816 PMCID: PMC10913236 DOI: 10.1186/s12864-024-10161-0] [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: 12/15/2023] [Accepted: 02/25/2024] [Indexed: 03/07/2024] Open
Abstract
BACKGROUND Vitamin A and retinoic acid (RA, a metabolite of vitamin A), are inextricably involved to the development of skeletal muscle in animals. However, the mechanisms regulating skeletal muscle development by vitamin A remain poorly reported. The current study designed to investigate the underlying mechanism of vitamin A affecting myogenic differentiation of lamb myoblasts through transcriptome sequencing (RNA-Seq) and gene function validation experiments. It provides a theoretical basis for elucidating the regulation of vitamin A on skeletal muscle development as well as for improving the economic benefits of the mutton sheep industry. RESULTS Newborn lambs were injected with 7,500 IU vitamin A, and longissimus dorsi (LD) muscle tissue was surgically sampled for RNA-Seq analysis and primary myoblasts isolation at 3 weeks of age. The results showed that a total of 14 down-regulated and 3 up-regulated genes, were identified between control and vitamin A groups. Among them, BHLHE40 expression was upregulated in vitamin A group lambs. Furthermore, BHLHE40 expression is significantly increased after initiation of differentiation in myoblasts, and RA addition during differentiation greatly promoted BHLHE40 mRNA expression. In vitro, RA inhibited myoblasts proliferation and promoted myoblasts myogenic differentiation through BHLHE40. Moreover, BHLHE40 was proved to inhibit the expression of the DNA binding inhibitor 3 (ID3), and meanwhile, ID3 could effectively promote myoblasts proliferation and inhibit myoblasts myogenic differentiation. CONCLUSIONS Taken together, our results suggested that vitamin A inhibited myoblasts proliferation and promoted myoblasts myogenic differentiation by inhibiting ID3 expression through BHLHE40.
Collapse
Affiliation(s)
- Pengkang Song
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China
- Shanxi Key Laboratory of Animal Genetics Resource Utilization and Breeding, Taigu, P. R. China
| | - Jiamin Zhao
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China
- Shanxi Key Laboratory of Animal Genetics Resource Utilization and Breeding, Taigu, P. R. China
| | - Weipeng Zhang
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China
| | - Xuying Li
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China
| | - Bingzhen Ji
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China
| | - Junxing Zhao
- College of Animal Science, Shanxi Agricultural University, 030801, Taigu, Shanxi, P. R. China.
- Shanxi Key Laboratory of Animal Genetics Resource Utilization and Breeding, Taigu, P. R. China.
| |
Collapse
|
3
|
Yang N, Das D, Shankar SR, Goy PA, Guccione E, Taneja R. An interplay between BRD4 and G9a regulates skeletal myogenesis. Front Cell Dev Biol 2022; 10:978931. [PMID: 36158208 PMCID: PMC9489841 DOI: 10.3389/fcell.2022.978931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
Histone acetylation and methylation are epigenetic modifications that are dynamically regulated by chromatin modifiers to precisely regulate gene expression. However, the interplay by which histone modifications are synchronized to coordinate cellular differentiation is not fully understood. In this study, we demonstrate a relationship between BRD4, a reader of acetylation marks, and G9a, a writer of methylation marks in the regulation of myogenic differentiation. Using loss- and gain-of-function studies, as well as a pharmacological inhibition of its activity, we examined the mechanism by which BRD4 regulates myogenesis. Transcriptomic analysis using RNA sequencing revealed that a number of myogenic differentiation genes are downregulated in Brd4-depleted cells. Interestingly, some of these genes were upregulated upon G9a knockdown, indicating that BRD4 and G9a play opposing roles in the control of myogenic gene expression. Remarkably, the differentiation defect caused by Brd4 knockdown was rescued by inhibition of G9a methyltransferase activity. These findings demonstrate that the absence of BRD4 results in the upregulation of G9a activity and consequently impaired myogenic differentiation. Collectively, our study identifies an interdependence between BRD4 and G9a for the precise control of transcriptional outputs to regulate myogenesis.
Collapse
Affiliation(s)
- Naidi Yang
- Department of Physiology, Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), Nanjing, China
| | - Dipanwita Das
- Department of Physiology, Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Shilpa Rani Shankar
- Department of Physiology, Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Pierre-Alexis Goy
- Methyltransferases in Development and Disease Group, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- Genome Institute of Singapore, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Ernesto Guccione
- Methyltransferases in Development and Disease Group, Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- Department of Oncological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, United States
| | - Reshma Taneja
- Department of Physiology, Healthy Longevity Translational Research Program, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- *Correspondence: Reshma Taneja,
| |
Collapse
|
4
|
Gioftsidi S, Relaix F, Mourikis P. The Notch signaling network in muscle stem cells during development, homeostasis, and disease. Skelet Muscle 2022; 12:9. [PMID: 35459219 PMCID: PMC9027478 DOI: 10.1186/s13395-022-00293-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 03/16/2022] [Indexed: 01/22/2023] Open
Abstract
Skeletal muscle stem cells have a central role in muscle growth and regeneration. They reside as quiescent cells in resting muscle and in response to damage they transiently amplify and fuse to produce new myofibers or self-renew to replenish the stem cell pool. A signaling pathway that is critical in the regulation of all these processes is Notch. Despite the major differences in the anatomical and cellular niches between the embryonic myotome, the adult sarcolemma/basement-membrane interphase, and the regenerating muscle, Notch signaling has evolved to support the context-specific requirements of the muscle cells. In this review, we discuss the diverse ways by which Notch signaling factors and other modifying partners are operating during the lifetime of muscle stem cells to establish an adaptive dynamic network.
Collapse
Affiliation(s)
- Stamatia Gioftsidi
- Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM), Mondor Institute for Biomedical Research (IMRB), F-94010, Créteil, France
| | - Frederic Relaix
- Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM), Mondor Institute for Biomedical Research (IMRB), F-94010, Créteil, France
- EnvA, IMRB, F-94700, Maisons-Alfort, France
- Etablissement Français du Sang (EFS), IMRB, F-94010, Creteil, France
- Assistance Publique-Hôpitaux de Paris, Hopital Mondor, Service d'Histologie, F-94010, Creteil, France
| | - Philippos Mourikis
- Université Paris Est Créteil, Institut National de la Santé et de la Recherche Médicale (INSERM), Mondor Institute for Biomedical Research (IMRB), F-94010, Créteil, France.
| |
Collapse
|
5
|
Gerrard JC, Hay JP, Adams RN, Williams JC, Huot JR, Weathers KM, Marino JS, Arthur ST. Current Thoughts of Notch's Role in Myoblast Regulation and Muscle-Associated Disease. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182312558. [PMID: 34886282 PMCID: PMC8657396 DOI: 10.3390/ijerph182312558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/17/2021] [Accepted: 11/23/2021] [Indexed: 12/25/2022]
Abstract
The evolutionarily conserved signaling pathway Notch is unequivocally essential for embryogenesis. Notch’s contribution to the muscle repair process in adult tissue is complex and obscure but necessary. Notch integrates with other signals in a functional antagonist manner to direct myoblast activity and ultimately complete muscle repair. There is profound recent evidence describing plausible mechanisms of Notch in muscle repair. However, the story is not definitive as evidence is slowly emerging that negates Notch’s importance in myoblast proliferation. The purpose of this review article is to examine the prominent evidence and associated mechanisms of Notch’s contribution to the myogenic repair phases. In addition, we discuss the emerging roles of Notch in diseases associated with muscle atrophy. Understanding the mechanisms of Notch’s orchestration is useful for developing therapeutic targets for disease.
Collapse
Affiliation(s)
- Jeffrey C. Gerrard
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - Jamison P. Hay
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - Ryan N. Adams
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - James C. Williams
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - Joshua R. Huot
- Department of Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, USA;
| | - Kaitlin M. Weathers
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - Joseph S. Marino
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
| | - Susan T. Arthur
- Department of Applied Physiology, Health and Clinical Sciences, University of North Carolina-Charlotte, Charlotte, NC 28223, USA; (J.C.G.); (J.P.H.); (R.N.A.); (J.C.W.III); (K.M.W.); (J.S.M.)
- Correspondence:
| |
Collapse
|
6
|
Kiss Z, Mudryj M, Ghosh PM. Non-circadian aspects of BHLHE40 cellular function in cancer. Genes Cancer 2020; 11:1-19. [PMID: 32577154 PMCID: PMC7289903 DOI: 10.18632/genesandcancer.201] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 02/27/2020] [Indexed: 02/06/2023] Open
Abstract
While many genes specifically act as oncogenes or tumor suppressors, others are tumor promoters or suppressors in a context-dependent manner. Here we will review the basic-helix-loop-helix (BHLH) protein BHLHE40, (also known as BHLHB2, STRA13, DEC1, or SHARP2) which is overexpressed in gastric, breast, and brain tumors; and downregulated in colorectal, esophageal, pancreatic and lung cancer. As a transcription factor, BHLHE40 is expressed in the nucleus, where it binds to target gene promoters containing the E-box hexanucleotide sequence, but can also be expressed in the cytoplasm, where it stabilizes cyclin E, preventing cyclin E-mediated DNA replication and cell cycle progression. In different organs BHLHE40 regulates different targets; hence may have different impacts on tumorigenesis. BHLHE40 promotes PI3K/Akt/mTOR activation in breast cancer, activating tumor progression, but suppresses STAT1 expression in clear cell carcinoma, triggering tumor suppression. Target specificity likely depends on cooperation with other transcription factors. BHLHE40 is activated in lung and esophageal carcinoma by the tumor suppressor p53 inducing senescence and suppressing tumor growth, but is also activated under hypoxic conditions by HIF-1α in gastric cancer and hepatocellular carcinomas, stimulating tumor progression. Thus, BHLHE40 is a multi-functional protein that mediates the promotion or suppression of cancer in a context dependent manner.
Collapse
Affiliation(s)
- Zsofia Kiss
- VA Northern California Health Care System, Sacramento, CA, USA
- Department of Urology, University of California Davis School of Medicine, Sacramento, CA, USA
| | - Maria Mudryj
- VA Northern California Health Care System, Sacramento, CA, USA
- Department of Microbiology and Immunology, University of California, Davis, CA, USA
| | - Paramita M. Ghosh
- VA Northern California Health Care System, Sacramento, CA, USA
- Department of Urology, University of California Davis School of Medicine, Sacramento, CA, USA
- Department of Biochemistry and Molecular Medicine, University of California Davis School of Medicine, Sacramento, CA, USA
| |
Collapse
|
7
|
Choi MH, Palanichamy Kala M, Ow JR, Rao VK, Suriyamurthy S, Taneja R. GLP inhibits heterochromatin clustering and myogenic differentiation by repressing MeCP2. J Mol Cell Biol 2019; 10:161-174. [PMID: 28992061 DOI: 10.1093/jmcb/mjx038] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 08/17/2017] [Indexed: 01/07/2023] Open
Abstract
Myogenic differentiation is accompanied by alterations in the chromatin states, which permit or restrict the transcriptional machinery and thus impact distinctive gene expression profiles. The mechanisms by which higher-order chromatin remodeling is associated with gene activation and silencing during differentiation is not fully understood. In this study, we provide evidence that the euchromatic lysine methyltransferase GLP regulates heterochromatin organization and myogenic differentiation. Interestingly, GLP represses expression of the methyl-binding protein MeCP2 that induces heterochromatin clustering during differentiation. Consequently, MeCP2 and HP1γ localization at major satellites are altered upon modulation of GLP expression. In GLP knockdown cells, depletion of MeCP2 restored both chromatin organization and myogenic differentiation. These results identify a novel regulatory axis between a histone methylation writer and DNA methylation reader, which is important for heterochromatin organization during differentiation.
Collapse
Affiliation(s)
- Min Hee Choi
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| | - Monica Palanichamy Kala
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Jin Rong Ow
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| | - Vinay Kumar Rao
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Sudha Suriyamurthy
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Reshma Taneja
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| |
Collapse
|
8
|
Cui S, Li L, Yu RT, Downes M, Evans RM, Hulin JA, Makarenkova HP, Meech R. β-Catenin is essential for differentiation of primary myoblasts via cooperation with MyoD and α-catenin. Development 2019; 146:dev.167080. [PMID: 30683662 DOI: 10.1242/dev.167080] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 01/16/2019] [Indexed: 12/12/2022]
Abstract
Canonical Wnts promote myoblast differentiation; however, the role of β-catenin in adult myogenesis has been contentious, and its mechanism(s) unclear. Using CRISPR-generated β-catenin-null primary adult mouse myoblasts, we found that β-catenin was essential for morphological differentiation and timely deployment of the myogenic gene program. Alignment, elongation and fusion were grossly impaired in null cells, and myogenic gene expression was not coordinated with cytoskeletal and membrane remodeling events. Rescue studies and genome-wide analyses extended previous findings that a β-catenin-TCF/LEF interaction is not required for differentiation, and that β-catenin enhances MyoD binding to myogenic loci. We mapped cellular pathways controlled by β-catenin and defined novel targets in myoblasts, including the fusogenic genes myomaker and myomixer. We also showed that interaction of β-catenin with α-catenin was important for efficient differentiation. Overall the study suggests dual roles for β-catenin: a TCF/LEF-independent nuclear function that coordinates an extensive network of myogenic genes in cooperation with MyoD; and an α-catenin-dependent membrane function that helps control cell-cell interactions. β-Catenin-TCF/LEF complexes may function primarily in feedback regulation to control levels of β-catenin and thus prevent precocious/excessive myoblast fusion.
Collapse
Affiliation(s)
- Shuang Cui
- Department of Clinical Pharmacology, Flinders University, Bedford Park, SA 5042, Australia.,Department of Physiology, Shandong University School of Medicine, Jinan, Shandong 250012, China
| | - Liang Li
- Department of Biochemistry, Flinders University, Bedford Park, SA 5042 and Department of Biochemistry, University of Adelaide, North Tce, Adelaide, SA 5005, Australia
| | - Ruth T Yu
- Gene Expression Laboratory, Salk Institute, La Jolla, CA 92037, USA
| | - Michael Downes
- Gene Expression Laboratory, Salk Institute, La Jolla, CA 92037, USA
| | - Ronald M Evans
- Gene Expression Laboratory, Salk Institute, La Jolla, CA 92037, USA.,Howard Hughes Medical Institute, Salk Institute, La Jolla, CA 92037, USA
| | - Julie-Ann Hulin
- Department of Clinical Pharmacology, Flinders University, Bedford Park, SA 5042, Australia
| | - Helen P Makarenkova
- Department of Molecular Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Robyn Meech
- Department of Clinical Pharmacology, Flinders University, Bedford Park, SA 5042, Australia
| |
Collapse
|
9
|
Srinivasan S, Shankar SR, Wang Y, Taneja R. SUMOylation of G9a regulates its function as an activator of myoblast proliferation. Cell Death Dis 2019; 10:250. [PMID: 30867409 PMCID: PMC6416281 DOI: 10.1038/s41419-019-1465-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/13/2019] [Accepted: 02/20/2019] [Indexed: 02/03/2023]
Abstract
The lysine methyltransferase G9a plays a role in many cellular processes. It is a potent repressor of gene expression, a function attributed to its ability to methylate histone and non-histone proteins. Paradoxically, in some instances, G9a can activate gene expression. However, regulators of G9a expression and activity are poorly understood. In this study, we report that endogenous G9a is SUMOylated in proliferating skeletal myoblasts. There are four potential SUMOylation consensus motifs in G9a. Mutation of all four acceptor lysine residues [K79, K152, K256, and K799] inhibits SUMOylation. Interestingly, SUMOylation does not impact G9a-mediated repression of MyoD transcriptional activity or myogenic differentiation. In contrast, SUMO-defective G9a is unable to enhance proliferation of myoblasts. Using complementation experiments, we show that the proliferation defect of primary myoblasts from conditional G9a-deficient mice is rescued by re-expression of wild-type, but not SUMOylation-defective, G9a. Mechanistically, SUMOylation acts as signal for PCAF (P300/CBP-associated factor) recruitment at E2F1-target genes. This results in increased histone H3 lysine 9 acetylation marks at E2F1-target gene promoters that are required for S-phase progression. Our studies provide evidence by which SUMO modification of G9a influences the chromatin environment to impact cell cycle progression.
Collapse
Affiliation(s)
- Shruti Srinivasan
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117593, Singapore, Singapore
| | - Shilpa Rani Shankar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117593, Singapore, Singapore
| | - Yaju Wang
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117593, Singapore, Singapore
| | - Reshma Taneja
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117593, Singapore, Singapore.
| |
Collapse
|
10
|
Chang HC, Kao CH, Chung SY, Chen WC, Aninda LP, Chen YH, Juan YA, Chen SL. Bhlhe40 differentially regulates the function and number of peroxisomes and mitochondria in myogenic cells. Redox Biol 2018; 20:321-333. [PMID: 30391825 PMCID: PMC6218633 DOI: 10.1016/j.redox.2018.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/11/2018] [Accepted: 10/13/2018] [Indexed: 12/26/2022] Open
Abstract
PGC-1α is a key regulator of oxidative metabolism facilitating the expression of genes critical for the function and biogenesis of the two key oxidative organelles, mitochondria and peroxisomes, in skeletal muscle (SKM) and other organs. Our recent studies have found that the transcription factor Bhlhe40 negatively regulates PGC-1α gene expression and its coactivational activity, therefore, this factor should have profound influence on the biogenesis and metabolic activity of mitochondria and peroxisomes. Here we found that both the number and activity of peroxisomes were increased upon knockdown of Bhlhe40 expression but were repressed by its over-expression. Mitochondrial efficiency was significantly reduced by Bhlhe40 knockdown, resulting in the burst of ROS. Over-expression of a constitutively active PGC-1α-interactive domain (named as VBH135) of Bhlhe40 mimicked the effects of its knockdown on peroxisomes but simultaneously reduced ROS level. Furthermore, the efficiency, but not the number, of mitochondria was also increased by VBH135, suggesting differential regulation of peroxisomes and mitochondria by Bhlhe40. Unsaturated fatty acid oxidation, insulin response, and oxidative respiration were highly enhanced in Bhlhe40 knockdown or VBH135 over-expressed cells, suggesting the importance of Bhlhe40 in the regulation of unsaturated fatty acid and glucose oxidative metabolism. Expression profiling of genes important for either organelle also supports differential regulation of peroxisomes and mitochondria by Bhlhe40. These observations have established the important role of Bhlhe40 in SKM oxidative metabolism as the critical regulator of peroxisome and mitochondrion biogenesis and functions, and thus should provide a novel route for developing drugs targeting SKM metabolic diseases. Knockout of Bhlhe40 increased ROS but over-expression of Bhlhe40 reduced ROS. Peroxisome number was increased by Bhlhe40 knockout or VBH135 overexpression. Mitochondrial efficiency was reduced by Bhlhe40 knockout but increased by VBH135. Oxidative respiration was enhanced by Bhlhe40 knockdown or VBH135 overexpression. Bhlhe40 repressed PGC-1α coactivation of nuclear gene expression.
Collapse
Affiliation(s)
- Hsuan Chia Chang
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Chien Han Kao
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Shih Ying Chung
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Wei Cheng Chen
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Lulus Putri Aninda
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Yi Huan Chen
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Yi An Juan
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC
| | - Shen Liang Chen
- Department of Life Sciences, National Central University, Jhongli, Taiwan, ROC.
| |
Collapse
|
11
|
Huang Y, Lai X, Hu L, Lei C, Lan X, Zhang C, Ma Y, Zheng L, Bai Y, Lin F, Chen H. Over‐expression of DEC1 inhibits myogenic differentiation by modulating MyoG activity in bovine satellite cell. J Cell Physiol 2018; 233:9365-9374. [DOI: 10.1002/jcp.26471] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Accepted: 01/05/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Yongzhen Huang
- Shaanxi Key Laboratory of Molecular Biology for AgricultureCollege of Animal Science and TechnologyNorthwest A&F UniversityYanglingShaanxiChina
| | - Xinsheng Lai
- Shaanxi Key Laboratory of Molecular Biology for AgricultureCollege of Animal Science and TechnologyNorthwest A&F UniversityYanglingShaanxiChina
- The Laboratory of Synaptic Development and Plasticity, Institute of Life ScienceNanchang UniversityNanchangChina
- School of Life ScienceNanchang UniversityNanchangChina
| | - Linyong Hu
- Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningQinghaiChina
| | - Chuzhao Lei
- Shaanxi Key Laboratory of Molecular Biology for AgricultureCollege of Animal Science and TechnologyNorthwest A&F UniversityYanglingShaanxiChina
| | - Xianyong Lan
- Shaanxi Key Laboratory of Molecular Biology for AgricultureCollege of Animal Science and TechnologyNorthwest A&F UniversityYanglingShaanxiChina
| | - Chunlei Zhang
- Institute of Cellular and Molecular BiologyJiangsu Normal UniversityXuzhouJiangsuChina
| | - Yun Ma
- College of Life Sciences, Xinyang Normal UniversityInstitute for Conservation and Utilization of Agro‐Bioresources in Dabie MountainsXinyangHenanChina
| | - Li Zheng
- Henan University of Animal Husbandry and EconomyZhengzhouHenanChina
| | - Yue‐Yu Bai
- Animal Health Supervision in Henan ProvinceZhengzhouHenanChina
| | - Fengpeng Lin
- Bureau of Animal Husbandry of Biyang CountyBiyangHenanChina
| | - Hong Chen
- Shaanxi Key Laboratory of Molecular Biology for AgricultureCollege of Animal Science and TechnologyNorthwest A&F UniversityYanglingShaanxiChina
| |
Collapse
|
12
|
Zhang Y, Pan X, Sun Y, Geng YJ, Yu XY, Li Y. The Molecular Mechanisms and Prevention Principles of Muscle Atrophy in Aging. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1088:347-368. [PMID: 30390260 DOI: 10.1007/978-981-13-1435-3_16] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Muscle atrophy in aging is characterized by progressive loss of muscle mass and function. Muscle mass is determined by the balance of synthesis and degradation of protein, which are regulated by several signaling pathways such as ubiquitin-proteasome system, autophagy-lysosome systems, oxidative stress, proinflammatory cytokines, hormones, and so on. Sufficient nutrition can enhance protein synthesis, while exercise can improve the quality of life in the elderly. This chapter will discuss the epidemiology, pathogenesis, as well as the current treatment for aging-induced muscular atrophy.
Collapse
Affiliation(s)
- Yu Zhang
- Institute for Cardiovascular Science & Department of Cardiovascular Surgery, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, People's Republic of China
| | - Xiangbin Pan
- Department of Cardiac Surgery, Fuwai Hospital, Beijing, People's Republic of China
| | - Yi Sun
- Fuwai Yunnan Cardiovascular Hospital, Kunming, Yunnan, People's Republic of China
| | | | - Xi-Yong Yu
- Guangzhou Medical University, Guangzhou, Guangdong, People's Republic of China
| | - Yangxin Li
- Institute for Cardiovascular Science & Department of Cardiovascular Surgery, First Affiliated Hospital of Soochow University, Suzhou, Jiangsu, People's Republic of China.
| |
Collapse
|
13
|
Nagata Y, Kiyono T, Okamura K, Goto YI, Matsuo M, Ikemoto-Uezumi M, Hashimoto N. Interleukin-1beta (IL-1β)-induced Notch ligand Jagged1 suppresses mitogenic action of IL-1β on human dystrophic myogenic cells. PLoS One 2017; 12:e0188821. [PMID: 29194448 PMCID: PMC5711031 DOI: 10.1371/journal.pone.0188821] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 11/14/2017] [Indexed: 11/17/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is a severe X-linked recessive muscle disorder caused by mutations in the dystrophin gene. Nonetheless, secondary processes involving perturbation of muscle regeneration probably exacerbate disease progression, resulting in the fatal loss of muscle in DMD patients. A dysfunction of undifferentiated myogenic cells is the most likely cause for the reduction of regenerative capacity of muscle. To clarify molecular mechanisms in perturbation of the regenerative capacity of DMD muscle, we have established several NCAM (CD56)-positive immortalized human dystrophic and non-dystrophic myogenic cell lines from DMD and healthy muscles. A pro-inflammatory cytokine, IL-1β, promoted cell cycle progression of non-dystrophic myogenic cells but not DMD myogenic cells. In contrast, IL-1β upregulated the Notch ligand Jagged1 gene in DMD myogenic cells but not in non-dystrophic myogenic cells. Knockdown of Jagged1 in DMD myogenic cells restored the IL-1β-promoted cell cycle progression. Conversely, enforced expression of Jagged1-blocked IL-1β promoted proliferation of non-dystrophic myogenic cells. In addition, IL-1β prevented myogenic differentiation of DMD myogenic cells depending on Jagged1 but not of non-dystrophic myogenic cells. These results demonstrate that Jagged1 induced by IL-1β in DMD myogenic cells modified the action of IL-1β and reduced the ability to proliferate and differentiate. IL-1β induced Jagged1 gene expression may be a feedback response to excess stimulation with this cytokine because high IL-1β (200-1000 pg/ml) induced Jagged1 gene expression even in non-dystrophic myogenic cells. DMD myogenic cells are likely to acquire the susceptibility of the Jagged1 gene to IL-1β under the microcircumstances in DMD muscles. The present results suggest that Jagged1 induced by IL-1β plays a crucial role in the loss of muscle regeneration capacity of DMD muscles. The IL-1β/Jagged1 pathway may be a new therapeutic target to ameliorate exacerbation of muscular dystrophy in a dystrophin-independent manner.
Collapse
Affiliation(s)
- Yuki Nagata
- Department of Regenerative Medicine, National Center for Geriatrics and Gerontology, Morioka, Oobu, Aichi, Japan
| | - Tohru Kiyono
- Division of Carcinogenesis and Cancer Prevention, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan
| | - Kikuo Okamura
- Department of Urology, National Center for Geriatrics and Gerontology, Morioka, Oobu, Aichi, Japan
| | - Yu-ichi Goto
- Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, Nervous, and Muscular Disorders, National Center of Neurology and Psychiatry,Ogawahigashi, Kodaira, Tokyo, Japan
| | - Masafumi Matsuo
- Department of Medical Rehabilitation, Faculty of Rehabilitation, Kobegakuin University, Ikawadani-cho, Nishi-ku, Kobe Japan
| | - Madoka Ikemoto-Uezumi
- Department of Regenerative Medicine, National Center for Geriatrics and Gerontology, Morioka, Oobu, Aichi, Japan
| | - Naohiro Hashimoto
- Department of Regenerative Medicine, National Center for Geriatrics and Gerontology, Morioka, Oobu, Aichi, Japan
- * E-mail:
| |
Collapse
|
14
|
Shan T, Xu Z, Wu W, Liu J, Wang Y. Roles of Notch1 Signaling in Regulating Satellite Cell Fates Choices and Postnatal Skeletal Myogenesis. J Cell Physiol 2017; 232:2964-2967. [DOI: 10.1002/jcp.25730] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 12/07/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Tizhong Shan
- College of Animal Sciences; Zhejiang University; Hangzhou Zhejiang P. R. China
- The Key Laboratory of Molecular Animal Nutrition; Ministry of Education; Hangzhou Zhejiang P. R. China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition; Hangzhou Zhejiang P. R. China
| | - Ziye Xu
- College of Animal Sciences; Zhejiang University; Hangzhou Zhejiang P. R. China
- The Key Laboratory of Molecular Animal Nutrition; Ministry of Education; Hangzhou Zhejiang P. R. China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition; Hangzhou Zhejiang P. R. China
| | - Weiche Wu
- College of Animal Sciences; Zhejiang University; Hangzhou Zhejiang P. R. China
- The Key Laboratory of Molecular Animal Nutrition; Ministry of Education; Hangzhou Zhejiang P. R. China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition; Hangzhou Zhejiang P. R. China
| | - Jiaqi Liu
- College of Animal Sciences; Zhejiang University; Hangzhou Zhejiang P. R. China
- The Key Laboratory of Molecular Animal Nutrition; Ministry of Education; Hangzhou Zhejiang P. R. China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition; Hangzhou Zhejiang P. R. China
| | - Yizhen Wang
- College of Animal Sciences; Zhejiang University; Hangzhou Zhejiang P. R. China
- The Key Laboratory of Molecular Animal Nutrition; Ministry of Education; Hangzhou Zhejiang P. R. China
- Zhejiang Provincial Laboratory of Feed and Animal Nutrition; Hangzhou Zhejiang P. R. China
| |
Collapse
|
15
|
An Integrative Analysis of Preeclampsia Based on the Construction of an Extended Composite Network Featuring Protein-Protein Physical Interactions and Transcriptional Relationships. PLoS One 2016; 11:e0165849. [PMID: 27802351 PMCID: PMC5089765 DOI: 10.1371/journal.pone.0165849] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Accepted: 10/18/2016] [Indexed: 11/19/2022] Open
Abstract
Preeclampsia (PE) is a pregnancy disorder defined by hypertension and proteinuria. This disease remains a major cause of maternal and fetal morbidity and mortality. Defective placentation is generally described as being at the root of the disease. The characterization of the transcriptome signature of the preeclamptic placenta has allowed to identify differentially expressed genes (DEGs). However, we still lack a detailed knowledge on how these DEGs impact the function of the placenta. The tools of network biology offer a methodology to explore complex diseases at a systems level. In this study we performed a cross-platform meta-analysis of seven publically available gene expression datasets comparing non-pathological and preeclamptic placentas. Using the rank product algorithm we identified a total of 369 DEGs consistently modified in PE. The DEGs were used as seeds to build both an extended physical protein-protein interactions network and a transcription factors regulatory network. Topological and clustering analysis was conducted to analyze the connectivity properties of the networks. Finally both networks were merged into a composite network which presents an integrated view of the regulatory pathways involved in preeclampsia and the crosstalk between them. This network is a useful tool to explore the relationship between the DEGs and enable hypothesis generation for functional experimentation.
Collapse
|
16
|
Ow JR, Palanichamy Kala M, Rao VK, Choi MH, Bharathy N, Taneja R. G9a inhibits MEF2C activity to control sarcomere assembly. Sci Rep 2016; 6:34163. [PMID: 27667720 PMCID: PMC5036183 DOI: 10.1038/srep34163] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 09/08/2016] [Indexed: 12/25/2022] Open
Abstract
In this study, we demonstrate that the lysine methyltransferase G9a inhibits sarcomere organization through regulation of the MEF2C-HDAC5 regulatory axis. Sarcomeres are essential for muscle contractile function. Presently, skeletal muscle disease and dysfunction at the sarcomere level has been associated with mutations of sarcomere proteins. This study provides evidence that G9a represses expression of several sarcomere genes and its over-expression disrupts sarcomere integrity of skeletal muscle cells. G9a inhibits MEF2C transcriptional activity that is essential for expression of sarcomere genes. Through protein interaction assays, we demonstrate that G9a interacts with MEF2C and its co-repressor HDAC5. In the presence of G9a, calcium signaling-dependent phosphorylation and export of HDAC5 to the cytoplasm is blocked which likely results in enhanced MEF2C-HDAC5 association. Activation of calcium signaling or expression of constitutively active CaMK rescues G9a-mediated repression of HDAC5 shuttling as well as sarcomere gene expression. Our results demonstrate a novel epigenetic control of sarcomere assembly and identifies new therapeutic avenues to treat skeletal and cardiac myopathies arising from compromised muscle function.
Collapse
Affiliation(s)
- Jin Rong Ow
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| | - Monica Palanichamy Kala
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Vinay Kumar Rao
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Min Hee Choi
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| | - Narendra Bharathy
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Reshma Taneja
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore.,NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 117456, Singapore
| |
Collapse
|
17
|
Pasut A, Chang NC, Gurriaran-Rodriguez U, Faulkes S, Yin H, Lacaria M, Ming H, Rudnicki MA. Notch Signaling Rescues Loss of Satellite Cells Lacking Pax7 and Promotes Brown Adipogenic Differentiation. Cell Rep 2016; 16:333-343. [PMID: 27346341 DOI: 10.1016/j.celrep.2016.06.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2014] [Revised: 04/22/2016] [Accepted: 05/21/2016] [Indexed: 12/22/2022] Open
Abstract
Pax7 is a nodal transcription factor that is essential for regulating the maintenance, expansion, and myogenic identity of satellite cells during both neonatal and adult myogenesis. Deletion of Pax7 results in loss of satellite cells and impaired muscle regeneration. Here, we show that ectopic expression of the constitutively active intracellular domain of Notch1 (NICD1) rescues the loss of Pax7-deficient satellite cells and restores their proliferative potential. Strikingly NICD1-expressing satellite cells do not undergo myogenic differentiation and instead acquire a brown adipogenic fate both in vivo and in vitro. NICD-expressing Pax7(-/-) satellite cells fail to upregulate MyoD and instead express the brown adipogenic marker PRDM16. Overall, these results show that Notch1 activation compensates for the loss of Pax7 in the quiescent state and acts as a molecular switch to promote brown adipogenesis in adult skeletal muscle.
Collapse
Affiliation(s)
- Alessandra Pasut
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada; Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H8M5, Canada
| | - Natasha C Chang
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Uxia Gurriaran-Rodriguez
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Sharlene Faulkes
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Hang Yin
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Melanie Lacaria
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Hong Ming
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada
| | - Michael A Rudnicki
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa, ON K1H8L6, Canada; Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H8M5, Canada.
| |
Collapse
|
18
|
Rao VK, Ow JR, Shankar SR, Bharathy N, Manikandan J, Wang Y, Taneja R. G9a promotes proliferation and inhibits cell cycle exit during myogenic differentiation. Nucleic Acids Res 2016; 44:8129-43. [PMID: 27229136 PMCID: PMC5041453 DOI: 10.1093/nar/gkw483] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Accepted: 05/19/2016] [Indexed: 11/12/2022] Open
Abstract
Differentiation of skeletal muscle cells, like most other cell types, requires a permanent exit from the cell cycle. The epigenetic programming underlying these distinct cellular states is not fully understood. In this study, we provide evidence that the lysine methyltransferase G9a functions as a central axis to regulate proliferation and differentiation of skeletal muscle cells. Transcriptome analysis of G9a knockdown cells revealed deregulation of many cell cycle regulatory genes. We demonstrate that G9a enhances cellular proliferation by two distinct mechanisms. G9a blocks cell cycle exit via methylation-dependent transcriptional repression of the MyoD target genes p21(Cip/Waf1) and Rb1. In addition, it activates E2F1-target genes in a methyltransferase activity-independent manner. We show that G9a is present in the E2F1/PCAF complex, and enhances PCAF occupancy and histone acetylation marks at E2F1-target promoters. Interestingly, G9a preferentially associates with E2F1 at the G1/S phase and with MyoD at the G2/M phase. Our results provide evidence that G9a functions both as a co-activator and a co-repressor to enhance cellular proliferation and inhibit myogenic differentiation.
Collapse
Affiliation(s)
- Vinay Kumar Rao
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Jin Rong Ow
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Shilpa Rani Shankar
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Narendra Bharathy
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Jayapal Manikandan
- NanoString Technologies, 530 Fairview Ave N, Suite 2000 Seattle, WA, USA
| | - Yaju Wang
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| | - Reshma Taneja
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, 117597, Singapore
| |
Collapse
|
19
|
Pierantozzi E, Vezzani B, Badin M, Curina C, Severi FM, Petraglia F, Randazzo D, Rossi D, Sorrentino V. Tissue-Specific Cultured Human Pericytes: Perivascular Cells from Smooth Muscle Tissue Have Restricted Mesodermal Differentiation Ability. Stem Cells Dev 2016; 25:674-86. [PMID: 26956507 DOI: 10.1089/scd.2015.0336] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Microvascular pericytes (PCs) are considered the adult counterpart of the embryonic mesoangioblasts, which represent a multipotent cell population that resides in the dorsal aorta of the developing embryo. Although PCs have been isolated from several adult organs and tissues, it is still controversial whether PCs from different tissues exhibit distinct differentiation potentials. To address this point, we investigated the differentiation potentials of isogenic human cultured PCs isolated from skeletal (sk-hPCs) and smooth muscle tissues (sm-hPCs). We found that both sk-hPCs and sm-hPCs expressed known pericytic markers and did not express endothelial, hematopoietic, and myogenic markers. Both sk-hPCs and sm-hPCs were able to differentiate into smooth muscle cells. In contrast, sk-hPCs, but not sm-hPCs, differentiated in skeletal muscle cells and osteocytes. Given the reported ability of the Notch pathway to regulate skeletal muscle and osteogenic differentiation, sk-hPCs and sm-hPCs were treated with N-[N-(3,5- difluorophenacetyl)-L-alanyl]-S-phenylglycine t-butyl ester (DAPT), a known inhibitor of Notch signaling. DAPT treatment, as assessed by histological and molecular analysis, enhanced myogenic differentiation and abolished osteogenic potential of sk-hPCs. In contrast, DAPT treatment did not affect either myogenic or osteogenic differentiation of sm-hPCs. In summary, these results indicate that, despite being isolated from the same anatomical niche, cultured PCs from skeletal muscle and smooth muscle tissues display distinct differentiation abilities.
Collapse
Affiliation(s)
| | - Bianca Vezzani
- 1 Molecular Medicine Section, University of Siena , Siena, Italy
| | - Margherita Badin
- 1 Molecular Medicine Section, University of Siena , Siena, Italy
| | - Carlo Curina
- 1 Molecular Medicine Section, University of Siena , Siena, Italy
| | - Filiberto Maria Severi
- 2 Division of Obstetrics and Gynecology, Department of Molecular and Developmental Medicine, University of Siena , Siena, Italy
| | - Felice Petraglia
- 2 Division of Obstetrics and Gynecology, Department of Molecular and Developmental Medicine, University of Siena , Siena, Italy
| | - Davide Randazzo
- 1 Molecular Medicine Section, University of Siena , Siena, Italy
| | - Daniela Rossi
- 1 Molecular Medicine Section, University of Siena , Siena, Italy
| | | |
Collapse
|
20
|
Beaudry M, Hidalgo M, Launay T, Bello V, Darribère T. Regulation of myogenesis by environmental hypoxia. J Cell Sci 2016; 129:2887-96. [DOI: 10.1242/jcs.188904] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
ABSTRACT
In aerobic organisms, oxygen is a critical factor for tissue and organ morphogenesis from embryonic development throughout the adult life. It regulates various intracellular pathways involved in cellular metabolism, proliferation, cell survival and fate. Organisms or tissues rapidly respond to changes in oxygen availability by activating complex signalling networks, which culminate in the control of mRNA translation and/or gene expression. This Commentary presents the effects of hypoxia during embryonic development, myoblasts and satellite cell proliferation and differentiation in vertebrates. We also outline the relationship between Notch, Wnt and growth factor signalling pathways, as well as the post-transcriptional regulation of myogenesis under conditions of hypoxia.
Collapse
Affiliation(s)
- Michèle Beaudry
- Université Paris13 Sorbonne Paris Cité, EA2363, UFR-SMBH, Laboratoire Hypoxie et poumons, Bobigny 93017, Cedex, France
| | - Magdalena Hidalgo
- Université Paris13 Sorbonne Paris Cité, EA2363, UFR-SMBH, Laboratoire Hypoxie et poumons, Bobigny 93017, Cedex, France
- UPMC Sorbonne Universités (Université Pierre et Marie Curie), UMR CNRS 7622, Laboratoire de Biologie du Développement, Paris 75252, Cedex 05, France
| | - Thierry Launay
- Université Paris-Descartes Sorbonne Paris cité, 75015 Paris, France
- Université d’Evry, Unité de Biologie Intégrative Appliquée à l’Exercice EA 7372, 9100 Evry, France
| | - Valérie Bello
- UPMC Sorbonne Universités (Université Pierre et Marie Curie), UMR CNRS 7622, Laboratoire de Biologie du Développement, Paris 75252, Cedex 05, France
| | - Thierry Darribère
- UPMC Sorbonne Universités (Université Pierre et Marie Curie), UMR CNRS 7622, Laboratoire de Biologie du Développement, Paris 75252, Cedex 05, France
| |
Collapse
|
21
|
Gorski JP, Huffman NT, Vallejo J, Brotto L, Chittur SV, Breggia A, Stern A, Huang J, Mo C, Seidah NG, Bonewald L, Brotto M. Deletion of Mbtps1 (Pcsk8, S1p, Ski-1) Gene in Osteocytes Stimulates Soleus Muscle Regeneration and Increased Size and Contractile Force with Age. J Biol Chem 2015; 291:4308-22. [PMID: 26719336 DOI: 10.1074/jbc.m115.686626] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Indexed: 12/28/2022] Open
Abstract
Conditional deletion of Mbtps1 (cKO) protease in bone osteocytes leads to an age-related increase in mass (12%) and in contractile force (30%) in adult slow twitch soleus muscles (SOL) with no effect on fast twitch extensor digitorum longus muscles. Surprisingly, bone from 10-12-month-old cKO animals was indistinguishable from controls in size, density, and morphology except for a 25% increase in stiffness. cKO SOL exhibited increased expression of Pax7, Myog, Myod1, Notch, and Myh3 and 6-fold more centralized nuclei, characteristics of postnatal regenerating muscle, but only in type I myosin heavy chain-expressing cells. Increased expression of gene pathways mediating EGF receptor signaling, circadian exercise, striated muscle contraction, and lipid and carbohydrate oxidative metabolism were also observed in cKO SOL. This muscle phenotype was not observed in 3-month-old mice. Although Mbtps1 mRNA and protein expression was reduced in cKO bone osteocytes, no differences in Mbtps1 or cre recombinase expression were observed in cKO SOL, explaining this age-related phenotype. Understanding bone-muscle cross-talk may provide a fresh and novel approach to prevention and treatment of age-related muscle loss.
Collapse
Affiliation(s)
- Jeff P Gorski
- From the Department of Oral and Craniofacial Sciences, University of Missouri-Kansas City Center of Excellence in the Study of Dental and Musculoskeletal Tissues, School of Dentistry,
| | - Nichole T Huffman
- From the Department of Oral and Craniofacial Sciences, University of Missouri-Kansas City Center of Excellence in the Study of Dental and Musculoskeletal Tissues, School of Dentistry
| | - Julian Vallejo
- Muscle Biology Research Group, School of Nursing and Health Studies, and
| | - Leticia Brotto
- Muscle Biology Research Group, School of Nursing and Health Studies, and
| | - Sridar V Chittur
- Center for Functional Genomics, University at Albany, Rensselaer, New York 12144
| | | | - Amber Stern
- School of Computing and Engineering, University of Missouri-Kansas City, Kansas City, Missouri 64108, Engineering Systems, Inc., Charlotte, North Carolina 28277, and
| | - Jian Huang
- Muscle Biology Research Group, School of Nursing and Health Studies, and
| | - Chenglin Mo
- Muscle Biology Research Group, School of Nursing and Health Studies, and
| | - Nabil G Seidah
- Institut de Recherches Cliniques Montreal, Montreal, Quebec H2W IR7, Canada
| | - Lynda Bonewald
- From the Department of Oral and Craniofacial Sciences, University of Missouri-Kansas City Center of Excellence in the Study of Dental and Musculoskeletal Tissues, School of Dentistry
| | - Marco Brotto
- Muscle Biology Research Group, School of Nursing and Health Studies, and
| |
Collapse
|
22
|
Wang C, Liu W, Liu Z, Chen L, Liu X, Kuang S. Hypoxia Inhibits Myogenic Differentiation through p53 Protein-dependent Induction of Bhlhe40 Protein. J Biol Chem 2015; 290:29707-16. [PMID: 26468276 DOI: 10.1074/jbc.m115.688671] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 11/06/2022] Open
Abstract
Satellite cells are muscle-resident stem cells capable of self-renewal and differentiation to repair injured muscles. However, muscle injury often leads to an ischemic hypoxia environment that impedes satellite cell differentiation and reduces the efficiency of muscle regeneration. Here we performed microarray analyses and identified the basic helix-loop-helix family transcription factor Bhlhe40 as a candidate mediator of the myogenic inhibitory effect of hypoxia. Bhlhe40 is strongly induced by hypoxia in satellite cell-derived primary myoblasts. Overexpression of Bhlhe40 inhibits Myog expression and mimics the effect of hypoxia on myogenesis. Inhibition of Bhlhe40, conversely, up-regulates Myog expression and promotes myogenic differentiation. Importantly, Bhlhe40 knockdown rescues myogenic differentiation under hypoxia. Mechanistically, Bhlhe40 binds to the proximal E-boxes of the Myog promoter and reduces the binding affinity and transcriptional activity of MyoD on Myog. Interestingly, hypoxia induces Bhlhe40 expression independent of HIF1α but through a novel p53-dependent signaling pathway. Our study establishes a crucial role of Bhlhe40 in mediating the repressive effect of hypoxia on myogenic differentiation and suggests that inhibition of Bhlhe40 or p53 may facilitate muscle regeneration after ischemic injuries.
Collapse
Affiliation(s)
- Chao Wang
- From the Departments of Animal Science and
| | - Weiyi Liu
- From the Departments of Animal Science and
| | - Zuojun Liu
- From the Departments of Animal Science and
| | | | - Xiaoqi Liu
- Biochemistry and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47906
| | - Shihuan Kuang
- From the Departments of Animal Science and Center for Cancer Research, Purdue University, West Lafayette, Indiana 47906
| |
Collapse
|
23
|
Thorley M, Malatras A, Duddy W, Le Gall L, Mouly V, Butler Browne G, Duguez S. Changes in Communication between Muscle Stem Cells and their Environment with Aging. J Neuromuscul Dis 2015; 2:205-217. [PMID: 27858742 PMCID: PMC5240546 DOI: 10.3233/jnd-150097] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Aging is associated with both muscle weakness and a loss of muscle mass, contributing towards overall frailty in the elderly. Aging skeletal muscle is also characterised by a decreasing efficiency in repair and regeneration, together with a decline in the number of adult stem cells. Commensurate with this are general changes in whole body endocrine signalling, in local muscle secretory environment, as well as in intrinsic properties of the stem cells themselves. The present review discusses the various mechanisms that may be implicated in these age-associated changes, focusing on aspects of cell-cell communication and long-distance signalling factors, such as levels of circulating growth hormone, IL-6, IGF1, sex hormones, and inflammatory cytokines. Changes in the local environment are also discussed, implicating IL-6, IL-4, FGF-2, as well as other myokines, and processes that lead to thickening of the extra-cellular matrix. These factors, involved primarily in communication, can also modulate the intrinsic properties of muscle stem cells, including reduced DNA accessibility and repression of specific genes by methylation. Finally we discuss the decrease in the stem cell pool, particularly the failure of elderly myoblasts to re-quiesce after activation, and the consequences of all these changes on general muscle homeostasis.
Collapse
Affiliation(s)
- Matthew Thorley
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Apostolos Malatras
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - William Duddy
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Laura Le Gall
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Vincent Mouly
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Gillian Butler Browne
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| | - Stéphanie Duguez
- Sorbonne Universités, UPMC Univ Paris 06, Center of Research in Myology UMRS 974, F-75013, Paris, France.,INSERM UMRS 974, F-75013, Paris, France.,CNRS FRE 3617, F-75013, Paris, France.,Institut de Myologie, F-75013, Paris, France
| |
Collapse
|
24
|
Bhlhe40 Represses PGC-1α Activity on Metabolic Gene Promoters in Myogenic Cells. Mol Cell Biol 2015; 35:2518-29. [PMID: 25963661 DOI: 10.1128/mcb.00387-15] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Accepted: 05/04/2015] [Indexed: 11/20/2022] Open
Abstract
PGC-1α is a transcriptional coactivator promoting oxidative metabolism in many tissues. Its expression in skeletal muscle (SKM) is induced by hypoxia and reactive oxidative species (ROS) generated during exercise, suggesting that PGC-1α might mediate the cross talk between oxidative metabolism and cellular responses to hypoxia and ROS. Here we found that PGC-1α directly interacted with Bhlhe40, a basic helix-loop-helix (bHLH) transcriptional repressor induced by hypoxia, and protects SKM from ROS damage, and they cooccupied PGC-1α-targeted gene promoters/enhancers, which in turn repressed PGC-1α transactivational activity. Bhlhe40 repressed PGC-1α activity through recruiting histone deacetylases (HDACs) and preventing the relief of PGC-1α intramolecular repression caused by its own intrinsic suppressor domain. Knockdown of Bhlhe40 mRNA increased levels of ROS, fatty acid oxidation, mitochondrial DNA, and expression of PGC-1α target genes. Similar effects were also observed when the Bhlhe40-mediated repression was rescued by a dominantly active form of the PGC-1α-interacting domain (PID) from Bhlhe40. We further found that Bhlhe40-mediated repression can be largely relieved by exercise, in which its recruitment to PGC-1α-targeted cis elements was significantly reduced. These observations suggest that Bhlhe40 is a novel regulator of PGC-1α activity repressing oxidative metabolism gene expression and mitochondrion biogenesis in sedentary SKM.
Collapse
|
25
|
Mu X, Tang Y, Lu A, Takayama K, Usas A, Wang B, Weiss K, Huard J. The role of Notch signaling in muscle progenitor cell depletion and the rapid onset of histopathology in muscular dystrophy. Hum Mol Genet 2015; 24:2923-37. [PMID: 25678553 DOI: 10.1093/hmg/ddv055] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 02/09/2015] [Indexed: 02/05/2023] Open
Abstract
Although it has been speculated that stem cell depletion plays a role in the rapid progression of the muscle histopathology associated with Duchenne Muscular Dystrophy (DMD), the molecular and cellular mechanisms responsible for stem cell depletion remain poorly understood. The rapid depletion of muscle stem cells has not been observed in the dystrophin-deficient model of DMD (mdx mouse), which may explain the relatively mild dystrophic phenotype observed in this animal model. In contrast, we have observed a rapid occurrence of stem cell depletion in the dystrophin/utrophin double knockout (dKO) mouse model, which exhibits histopathological features that more closely recapitulate the phenotype observed in DMD patients compared with the mdx mouse. Notch signaling has been found to be a key regulator of stem cell self-renewal and myogenesis in normal skeletal muscle; however, little is known about the role that Notch plays in the development of the dystrophic histopathology associated with DMD. Our results revealed an over-activation of Notch in the skeletal muscles of dKO mice, which correlated with sustained inflammation, impaired muscle regeneration and the rapid depletion and senescence of the muscle progenitor cells (MPCs, i.e. Pax7+ cells). Consequently, the repression of Notch in the skeletal muscle of dKO mice delayed/reduced the depletion and senescence of MPCs, and restored the myogenesis capacity while reducing inflammation and fibrosis. We suggest that the down-regulation of Notch could represent a viable approach to reduce the dystrophic histopathologies associated with DMD.
Collapse
Affiliation(s)
- Xiaodong Mu
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Ying Tang
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Aiping Lu
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Koji Takayama
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Arvydas Usas
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Bing Wang
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Kurt Weiss
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| | - Johnny Huard
- Stem Cell Research Center, Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA
| |
Collapse
|
26
|
De Salvo M, Raimondi L, Vella S, Adesso L, Ciarapica R, Verginelli F, Pannuti A, Citti A, Boldrini R, Milano GM, Cacchione A, Ferrari A, Collini P, Rosolen A, Bisogno G, Alaggio R, Inserra A, Locatelli M, Stifani S, Screpanti I, Miele L, Locatelli F, Rota R. Hyper-activation of Notch3 amplifies the proliferative potential of rhabdomyosarcoma cells. PLoS One 2014; 9:e96238. [PMID: 24797362 PMCID: PMC4010457 DOI: 10.1371/journal.pone.0096238] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 04/04/2014] [Indexed: 11/18/2022] Open
Abstract
Rhabdomyosarcoma (RMS) is a pediatric myogenic-derived soft tissue sarcoma that includes two major histopathological subtypes: embryonal and alveolar. The majority of alveolar RMS expresses PAX3-FOXO1 fusion oncoprotein, associated with the worst prognosis. RMS cells show myogenic markers expression but are unable to terminally differentiate. The Notch signaling pathway is a master player during myogenesis, with Notch1 activation sustaining myoblast expansion and Notch3 activation inhibiting myoblast fusion and differentiation. Accordingly, Notch1 signaling is up-regulated and activated in embryonal RMS samples and supports the proliferation of tumor cells. However, it is unable to control their differentiation properties. We previously reported that Notch3 is activated in RMS cell lines, of both alveolar and embryonal subtype, and acts by inhibiting differentiation. Moreover, Notch3 depletion reduces PAX3-FOXO1 alveolar RMS tumor growth in vivo. However, whether Notch3 activation also sustains the proliferation of RMS cells remained unclear. To address this question, we forced the expression of the activated form of Notch3, Notch3IC, in the RH30 and RH41 PAX3-FOXO1-positive alveolar and in the RD embryonal RMS cell lines and studied the proliferation of these cells. We show that, in all three cell lines tested, Notch3IC over-expression stimulates in vitro cell proliferation and prevents the effects of pharmacological Notch inhibition. Furthermore, Notch3IC further increases RH30 cell growth in vivo. Interestingly, knockdown of Notch canonical ligands JAG1 or DLL1 in RMS cell lines decreases Notch3 activity and reduces cell proliferation. Finally, the expression of Notch3IC and its target gene HES1 correlates with that of the proliferative marker Ki67 in a small cohort of primary PAX-FOXO1 alveolar RMS samples. These results strongly suggest that high levels of Notch3 activation increase the proliferative potential of RMS cells.
Collapse
MESH Headings
- Cell Line, Tumor
- Cell Proliferation
- Gene Expression Regulation, Neoplastic
- Humans
- Ki-67 Antigen/genetics
- Ki-67 Antigen/metabolism
- Oncogene Proteins, Fusion/biosynthesis
- Oncogene Proteins, Fusion/genetics
- Paired Box Transcription Factors/biosynthesis
- Paired Box Transcription Factors/genetics
- Receptor, Notch1/genetics
- Receptor, Notch1/metabolism
- Receptor, Notch3
- Receptors, Notch/genetics
- Receptors, Notch/metabolism
- Rhabdomyosarcoma, Alveolar/genetics
- Rhabdomyosarcoma, Alveolar/metabolism
- Rhabdomyosarcoma, Alveolar/pathology
- Rhabdomyosarcoma, Embryonal/genetics
- Rhabdomyosarcoma, Embryonal/metabolism
- Rhabdomyosarcoma, Embryonal/pathology
- Signal Transduction
Collapse
Affiliation(s)
- Maria De Salvo
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Lavinia Raimondi
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Serena Vella
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Laura Adesso
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Roberta Ciarapica
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Federica Verginelli
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Antonio Pannuti
- Stanley Scott Cancer Center, Louisiana State University Health Sciences Center and Louisiana Cancer Research Consortium, New Orleans, Louisiana, United States of America
| | - Arianna Citti
- Department of Pathology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Renata Boldrini
- Department of Pathology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Giuseppe M. Milano
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Antonella Cacchione
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Andrea Ferrari
- Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano, Italy
| | - Paola Collini
- Anatomic Pathology Unit 2, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano, Italy
| | - Angelo Rosolen
- Department of Pediatrics, Oncohematology Unit, University of Padova, Padova, Italy
| | - Gianni Bisogno
- Department of Pediatrics, Oncohematology Unit, University of Padova, Padova, Italy
| | - Rita Alaggio
- Department of Pathology, University of Padova, Padova, Italy
| | - Alessandro Inserra
- Department of Surgery, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Mattia Locatelli
- Department of Scientific Directorate, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
| | - Stefano Stifani
- Centre for Neuronal Survival, Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | | | - Lucio Miele
- Stanley Scott Cancer Center, Louisiana State University Health Sciences Center and Louisiana Cancer Research Consortium, New Orleans, Louisiana, United States of America
| | - Franco Locatelli
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
- Dipartimento di Scienze Pediatriche, Università di Pavia, Pavia, Italy
| | - Rossella Rota
- Department of Oncohematology, Ospedale Pediatrico Bambino Gesù, IRCCS, Roma, Italy
- * E-mail:
| |
Collapse
|
27
|
Mourikis P, Tajbakhsh S. Distinct contextual roles for Notch signalling in skeletal muscle stem cells. BMC DEVELOPMENTAL BIOLOGY 2014; 14:2. [PMID: 24472470 PMCID: PMC3903015 DOI: 10.1186/1471-213x-14-2] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 01/13/2014] [Indexed: 11/17/2022]
Abstract
Notch signalling acts in virtually every tissue during the lifetime of metazoans. Recent studies have pointed to multiple roles for Notch in stem cells during quiescence, proliferation, temporal specification, and maintenance of the niche architecture. Skeletal muscle has served as an excellent paradigm to examine these diverse roles as embryonic, foetal, and adult skeletal muscle stem cells have different molecular signatures and functional properties, reflecting their developmental specification during ontology. Notably, Notch signalling has emerged as a major regulator of all muscle stem cells. This review will provide an overview of Notch signalling during myogenic development and postnatally, and underscore the seemingly opposing contextual activities of Notch that have lead to a reassessment of its role in myogenesis.
Collapse
Affiliation(s)
| | - Shahragim Tajbakhsh
- Stem Cells and Development, CNRS URA 2578, Department of Developmental & Stem Cell Biology, Institut Pasteur, 25 rue du Dr, Roux, 75015 Paris, France.
| |
Collapse
|
28
|
Church JE, Trieu J, Chee A, Naim T, Gehrig SM, Lamon S, Angelini C, Russell AP, Lynch GS. Alterations in Notch signalling in skeletal muscles frommdxanddkodystrophic mice and patients with Duchenne muscular dystrophy. Exp Physiol 2014; 99:675-87. [DOI: 10.1113/expphysiol.2013.077255] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jarrod E. Church
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| | - Jennifer Trieu
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| | - Annabel Chee
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| | - Timur Naim
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| | - Stefan M. Gehrig
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| | - Séverine Lamon
- Centre for Physical Activity and Nutrition Research; School of Exercise and Nutrition Sciences; Deakin University; Victoria Australia
| | - Corrado Angelini
- Neurosciences Department; IRCCS San Camillo Hospital; Lido Venice Italy
| | - Aaron P. Russell
- Centre for Physical Activity and Nutrition Research; School of Exercise and Nutrition Sciences; Deakin University; Victoria Australia
| | - Gordon S. Lynch
- Basic and Clinical Myology Laboratory; Department of Physiology; The University of Melbourne; Victoria Australia
| |
Collapse
|
29
|
Ow JR, Tan YH, Jin Y, Bahirvani AG, Taneja R. Stra13 and Sharp-1, the Non-Grouchy Regulators of Development and Disease. Curr Top Dev Biol 2014; 110:317-38. [DOI: 10.1016/b978-0-12-405943-6.00009-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
30
|
Acharjee S, Chung TK, Gopinadhan S, Shankar SR, Wang Y, Li L, Vercherat C, Gulbagci NT, Rossner M, Taneja R. Sharp-1 regulates TGF-β signaling and skeletal muscle regeneration. J Cell Sci 2013; 127:599-608. [PMID: 24357723 DOI: 10.1242/jcs.136648] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Sharp-1 is a basic helix-loop-helix (bHLH) transcriptional repressor that is involved in a number of cellular processes. Our previous studies have demonstrated that Sharp-1 is a negative regulator of skeletal myogenesis and it blocks differentiation of muscle precursor cells by modulating the activity of MyoD. In order to understand its role in pre- and post-natal myogenesis, we assessed skeletal muscle development and freeze-injury-induced regeneration in Sharp-1-deficient mice. We show that embryonic skeletal muscle development is not impaired in the absence of Sharp-1; however, post-natally, the regenerative capacity is compromised. Although the initial phases of injury-induced regeneration proceed normally in Sharp-1(-/-) mice, during late stages, the mutant muscle exhibits necrotic fibers, calcium deposits and fibrosis. TGF-β expression, as well as levels of phosphorylated Smad2 and Smad3, are sustained in the mutant tissue and treatment with decorin, which blocks TGF-β signaling, improves the histopathology of Sharp-1(-/-) injured muscles. In vitro, Sharp-1 associates with Smad3, and its overexpression inhibits TGF-β- and Smad3-mediated expression of extracellular matrix genes in myofibroblasts. These results demonstrate that Sharp-1 regulates muscle regenerative capacity, at least in part, by modulation of TGF-β signaling.
Collapse
Affiliation(s)
- Sujata Acharjee
- Department of Developmental and Regenerative Biology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Numb-deficient satellite cells have regeneration and proliferation defects. Proc Natl Acad Sci U S A 2013; 110:18549-54. [PMID: 24170859 DOI: 10.1073/pnas.1311628110] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The adaptor protein Numb has been implicated in the switch between cell proliferation and differentiation made by satellite cells during muscle repair. Using two genetic approaches to ablate Numb, we determined that, in its absence, muscle regeneration in response to injury was impaired. Single myofiber cultures demonstrated a lack of satellite cell proliferation in the absence of Numb, and the proliferation defect was confirmed in satellite cell cultures. Quantitative RT-PCR from Numb-deficient satellite cells demonstrated highly up-regulated expression of p21 and Myostatin, both inhibitors of myoblast proliferation. Transfection with Myostatin-specific siRNA rescued the proliferation defect of Numb-deficient satellite cells. Furthermore, overexpression of Numb in satellite cells inhibited Myostatin expression. These data indicate a unique function for Numb during the initial activation and proliferation of satellite cells in response to muscle injury.
Collapse
|
32
|
Lai XS, Zhang CG, Wang J, Wang C, Lan XY, Lei CZ, Chen H. Developmental expression patterns and association study with growth traits of bovine Bhlhe40 gene. Mol Biol 2013. [DOI: 10.1134/s0026893313050105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
33
|
Abstract
Adult skeletal muscle in mammals is a stable tissue under normal circumstances but has remarkable ability to repair after injury. Skeletal muscle regeneration is a highly orchestrated process involving the activation of various cellular and molecular responses. As skeletal muscle stem cells, satellite cells play an indispensible role in this process. The self-renewing proliferation of satellite cells not only maintains the stem cell population but also provides numerous myogenic cells, which proliferate, differentiate, fuse, and lead to new myofiber formation and reconstitution of a functional contractile apparatus. The complex behavior of satellite cells during skeletal muscle regeneration is tightly regulated through the dynamic interplay between intrinsic factors within satellite cells and extrinsic factors constituting the muscle stem cell niche/microenvironment. For the last half century, the advance of molecular biology, cell biology, and genetics has greatly improved our understanding of skeletal muscle biology. Here, we review some recent advances, with focuses on functions of satellite cells and their niche during the process of skeletal muscle regeneration.
Collapse
Affiliation(s)
- Hang Yin
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, Ontario, Canada
| | | | | |
Collapse
|
34
|
Accelerated skeletal muscle recovery after in vivo polyphenol administration. J Nutr Biochem 2012; 23:1072-9. [DOI: 10.1016/j.jnutbio.2011.05.014] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Revised: 05/10/2011] [Accepted: 05/28/2011] [Indexed: 11/17/2022]
|
35
|
SUMO modification of Stra13 is required for repression of cyclin D1 expression and cellular growth arrest. PLoS One 2012; 7:e43137. [PMID: 22905217 PMCID: PMC3419196 DOI: 10.1371/journal.pone.0043137] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 07/16/2012] [Indexed: 12/18/2022] Open
Abstract
Stra13, a basic helix-loop-helix (bHLH) transcription factor is involved in myriad biological functions including cellular growth arrest, differentiation and senescence. However, the mechanisms by which its transcriptional activity and function are regulated remain unclear. In this study, we provide evidence that post-translational modification of Stra13 by Small Ubiquitin-like Modifier (SUMO) dramatically potentiates its ability to transcriptionally repress cyclin D1 and mediate G1 cell cycle arrest in fibroblast cells. Mutation of SUMO acceptor lysines 159 and 279 located in the C-terminal repression domain has no impact on nuclear localization; however, it abrogates association with the co-repressor histone deacetylase 1 (HDAC1), attenuates repression of cyclin D1, and prevents Stra13-mediated growth suppression. HDAC1, which promotes cellular proliferation and cell cycle progression, antagonizes Stra13 sumoylation-dependent growth arrest. Our results uncover an unidentified regulatory axis between Stra13 and HDAC1 in progression through the G1/S phase of the cell cycle, and provide new mechanistic insights into regulation of Stra13-mediated transcriptional repression by sumoylation.
Collapse
|
36
|
Soleimani VD, Punch VG, Kawabe YI, Jones AE, Palidwor GA, Porter CJ, Cross JW, Carvajal JJ, Kockx CEM, van IJcken WFJ, Perkins TJ, Rigby PWJ, Grosveld F, Rudnicki MA. Transcriptional dominance of Pax7 in adult myogenesis is due to high-affinity recognition of homeodomain motifs. Dev Cell 2012; 22:1208-20. [PMID: 22609161 DOI: 10.1016/j.devcel.2012.03.014] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Revised: 01/20/2012] [Accepted: 03/28/2012] [Indexed: 01/08/2023]
Abstract
Pax3 and Pax7 regulate stem cell function in skeletal myogenesis. However, molecular insight into their distinct roles has remained elusive. Using gene expression data combined with genome-wide binding-site analysis, we show that both Pax3 and Pax7 bind identical DNA motifs and jointly activate a large panel of genes involved in muscle stem cell function. Surprisingly, in adult myoblasts Pax3 binds a subset (6.4%) of Pax7 targets. Despite a significant overlap in their transcriptional network, Pax7 regulates distinct panels of genes involved in the promotion of proliferation and inhibition of myogenic differentiation. We show that Pax7 has a higher binding affinity to the homeodomain-binding motif relative to Pax3, suggesting that intrinsic differences in DNA binding contribute to the observed functional difference between Pax3 and Pax7 binding in myogenesis. Together, our data demonstrate distinct attributes of Pax7 function and provide mechanistic insight into the nonredundancy of Pax3 and Pax7 in muscle development.
Collapse
Affiliation(s)
- Vahab D Soleimani
- Sprott Centre for Stem Cell Research, Ottawa Hospital Research Institute, and Department of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
D'Angelo MA, Gomez-Cavazos JS, Mei A, Lackner DH, Hetzer MW. A change in nuclear pore complex composition regulates cell differentiation. Dev Cell 2012; 22:446-58. [PMID: 22264802 DOI: 10.1016/j.devcel.2011.11.021] [Citation(s) in RCA: 175] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Revised: 10/06/2011] [Accepted: 11/14/2011] [Indexed: 12/11/2022]
Abstract
Nuclear pore complexes (NPCs) are built from ∼30 different proteins called nucleoporins or Nups. Previous studies have shown that several Nups exhibit cell-type-specific expression and that mutations in NPC components result in tissue-specific diseases. Here we show that a specific change in NPC composition is required for both myogenic and neuronal differentiation. The transmembrane nucleoporin Nup210 is absent in proliferating myoblasts and embryonic stem cells (ESCs) but becomes expressed and incorporated into NPCs during cell differentiation. Preventing Nup210 production by RNAi blocks myogenesis and the differentiation of ESCs into neuroprogenitors. We found that the addition of Nup210 to NPCs does not affect nuclear transport but is required for the induction of genes that are essential for cell differentiation. Our results identify a single change in NPC composition as an essential step in cell differentiation and establish a role for Nup210 in gene expression regulation and cell fate determination.
Collapse
Affiliation(s)
- Maximiliano A D'Angelo
- Salk Institute for Biological Studies, Molecular and Cell Biology Laboratory, 10010 N. Torrey Pines Road, La Jolla, CA 92037, USA.
| | | | | | | | | |
Collapse
|
38
|
Lysine methyltransferase G9a methylates the transcription factor MyoD and regulates skeletal muscle differentiation. Proc Natl Acad Sci U S A 2012; 109:841-6. [PMID: 22215600 DOI: 10.1073/pnas.1111628109] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Skeletal muscle cells have served as a paradigm for understanding mechanisms leading to cellular differentiation. The proliferation and differentiation of muscle precursor cells require the concerted activity of myogenic regulatory factors including MyoD. In addition, chromatin modifiers mediate dynamic modifications of histone tails that are vital to reprogramming cells toward terminal differentiation. Here, we provide evidence for a unique dimension to epigenetic regulation of skeletal myogenesis. We demonstrate that the lysine methyltransferase G9a is dynamically expressed in myoblasts and impedes differentiation in a methyltransferase activity-dependent manner. In addition to mediating histone H3 lysine-9 di-methylation (H3K9me2) on MyoD target promoters, endogenous G9a interacts with MyoD in precursor cells and directly methylates it at lysine 104 (K104) to constrain its transcriptional activity. Mutation of K104 renders MyoD refractory to inhibition by G9a and enhances its myogenic activity. Interestingly, MyoD methylation is critical for G9a-mediated inhibition of myogenesis. These findings provide evidence of an unanticipated role for methyltransferases in cellular differentiation states by direct posttranslational modification of a transcription factor.
Collapse
|
39
|
Leem YE, Choi HK, Jung SY, Kim BJ, Lee KY, Yoon K, Qin J, Kang JS, Kim ST. Esco2 promotes neuronal differentiation by repressing Notch signaling. Cell Signal 2011; 23:1876-84. [PMID: 21777673 DOI: 10.1016/j.cellsig.2011.07.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Accepted: 07/05/2011] [Indexed: 10/18/2022]
Abstract
Esco2 is an acetyltransferase that is required for the establishment of sister chromatid cohesion. Roberts-SC phocomelia (RBS) syndrome caused by the mutations of Esco2 gene, is an autosomal recessive development disorder characterized by growth retardation, limb reduction and craniofacial abnormalities including cleft lip and palate. Here, we show that Esco2 protein co-immunoprecipitates with Notch but not with CBF1. Esco2 represses the transactivational activity of Notch protein in an acetyltransferase-independent manner. Chromatin immunoprecipitation experiments suggest that Esco2 might regulate the activity of NICD-CBF1 via attenuating NICD binding to CBF1 on the promoter of Hes1, the downstream target gene of Notch. Furthermore, we demonstrate that the overexpression of Esco2 promotes the neuronal differentiation of P19 embryonic carcinoma cells and C17.2 neural progenitor cells and the knockdown of Esco2 by siRNA blocks the differentiation. The inhibitory effects of Notch protein on neuronal differentiation of P19 cells was suppressed by Esco2 overexpression. Taken together, our study suggests that Esco2 may play an important role in neurogenesis by attenuating Notch signaling to promote neuronal differentiation.
Collapse
Affiliation(s)
- Young-Eun Leem
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, 440-746, Republic of Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
40
|
Jones DTW, Mulholland SA, Pearson DM, Malley DS, Openshaw SWS, Lambert SR, Liu L, Bäcklund LM, Ichimura K, Collins VP. Adult grade II diffuse astrocytomas are genetically distinct from and more aggressive than their paediatric counterparts. Acta Neuropathol 2011; 121:753-61. [PMID: 21327941 DOI: 10.1007/s00401-011-0810-6] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/31/2011] [Accepted: 02/06/2011] [Indexed: 12/17/2022]
Abstract
Diffuse astrocytomas (WHO grade II) typically present as slow-growing tumours showing significant cellular differentiation, but possessing a tendency towards malignant progression. They account for ~10% of all astrocytic tumours, with a peak incidence between 30 and 40 years of age. Median survival is reported as around 6-8 years. Mutations of TP53 and IDH1 have been described as genetic hallmarks, while copy number alterations are also relatively common. However, there is some evidence to suggest that these characteristics may vary with age. Here, we present an integrated clinicopathologic, genomic and transcriptomic analysis suggesting that paediatric and adult tumours are associated with distinct genetic signatures. For example, no childhood tumour showed mutation of IDH1/2 or TP53, virtually no copy number changes were seen, and MGMT methylation was absent. In contrast, adult tumours showed IDH1/2 mutation in 94% and TP53 mutation in 69% of cases, with multiple copy number alterations per case and hypermethylation of MGMT in the majority of tumours. These differences were associated with a worse prognosis in the adult patients. The expression array data also revealed a significant difference in the expression of a number of genes putatively involved in neural stem cell maintenance and CNS development, including DLL3, HES5, BMP2, TIMP1 and BAMBI. Genes involved in DNA replication and the cell cycle were also enriched in the adult tumours, suggesting that their more aggressive behaviour may be due to derivation from a more rapidly dividing, less differentiated cell type.
Collapse
Affiliation(s)
- David T W Jones
- Division of Molecular Histopathology, Department of Pathology, University of Cambridge, UK.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Shi XH, Zheng Y, Sun Q, Cui J, Liu QH, Qü F, Wang YS. DEC1 nuclear expression: A marker of differentiation grade in hepatocellular carcinoma. World J Gastroenterol 2011; 17:2037-43. [PMID: 21528084 PMCID: PMC3082759 DOI: 10.3748/wjg.v17.i15.2037] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 12/12/2010] [Accepted: 12/19/2010] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the expression patterns of human differentiated embryo chondrocyte 1 (DEC1) in hepatocellular carcinoma (HCC) and corresponding adjacent non-tumor and the normal liver tissues, the association between DEC1 expression and histopathological variables and the role of DEC1 in hepatocarcinogenesis.
METHODS: The expression of DEC1 was detected immunohistochemically in 176 paraffin-embedded sections from 63 patients with HCC and 50 subjects with normal liver tissues.
RESULTS: DEC1 protein was persistently expressed in the cytoplasm of hepatocytes in normal liver and HCC tissues. Compared with adjacent non-tumor liver tissues, HCC tissues showed high nuclear expression of DEC1 protein. However, high DEC1 nuclear expression was more frequently detected in well-differentiated (83.3%) than in moderately (27.3%) and poorly differentiated HCC (16.7%). Low DEC1 expression was associated with poor histological differentiation and malignancy progression. A correlation was found between the nuclear expression of DEC1 protein and histological differentiation (r = 0.376, P = 0.024).
CONCLUSION: DEC1 is expressed in the cytoplasm of hepatocytes and because nuclear DEC1 expression is decreased with decreasing differentiation status of HCC, nuclear DEC1 might be a marker of HCC differentiation.
Collapse
|
42
|
Kitamoto T, Hanaoka K. Notch3 Null Mutation in Mice Causes Muscle Hyperplasia by Repetitive Muscle Regeneration. Stem Cells 2010; 28:2205-16. [DOI: 10.1002/stem.547] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
43
|
Punch VG, Jones AE, Rudnicki MA. Transcriptional networks that regulate muscle stem cell function. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2010; 1:128-140. [PMID: 20835986 DOI: 10.1002/wsbm.11] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Muscle stem cells comprise different populations of stem and progenitor cells found in embryonic and adult tissues. A number of signaling and transcriptional networks are responsible for specification and survival of these cell populations and regulation of their behavior during growth and regeneration. Muscle progenitor cells are mostly derived from the somites of developing embryos, while satellite cells are the progenitor cells responsible for the majority of postnatal growth and adult muscle regeneration. In resting muscle, these stem cells are quiescent, but reenter the cell cycle during their activation, whereby they undergo decisions to self-renew, proliferate, or differentiate and fuse into multinucleated myofibers to repair damaged muscle. Regulation of muscle stem cell activity is under the precise control of a number of extrinsic signaling pathways and active transcriptional networks that dictate their behavior, fate, and regenerative potential. Here, we review the networks responsible for these different aspects of muscle stem cell biology and discuss prevalent parallels between mechanisms regulating the activity of embryonic muscle progenitor cells and adult satellite cells.
Collapse
Affiliation(s)
- Vincent G Punch
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
- The Sprott Centre for Stem Cell Research, Ottawa Health Research Institute, Ottawa, Canada
| | - Andrew E Jones
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
- The Sprott Centre for Stem Cell Research, Ottawa Health Research Institute, Ottawa, Canada
| | - Michael A Rudnicki
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Canada
- The Sprott Centre for Stem Cell Research, Ottawa Health Research Institute, Ottawa, Canada
| |
Collapse
|
44
|
Lin Q, Yun Z. Impact of the hypoxic tumor microenvironment on the regulation of cancer stem cell characteristics. Cancer Biol Ther 2010; 9:949-56. [PMID: 20581454 DOI: 10.4161/cbt.9.12.12347] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Solid tumors often contain regions with insufficient oxygen delivery, a condition called hypoxia. Tumor hypoxia is an independent prognostic factor significantly correlated with advanced stages of malignancy, increased resistance to conventional therapy, and reduced disease-free survival. Hypoxic tumor cells exhibit poorly differentiated phenotypes resembling stem or progenitor cells. Studies have shown that hypoxia can inhibit tumor cell differentiation and promote maintenance of cancer stem cells. In addition, hypoxia also blocks the differentiation of mesenchymal stem/progenitor cells, a potential source of tumor-associated stromal cells. Therefore, hypoxia may play a critical role during the evolution of the tumor stromal microenvironment and formation of the putative cancer stem cell niches. Conceptually, hypoxia may help create a microenvironment enriched both in poorly differentiated tumor cells and in undifferentiated stromal cells. Such an undifferentiated hypoxic microenvironment may provide essential cellular interactions and environmental signals for the preferential maintenance of cancer stem cells. This review will discuss the hypoxia-regulated stem cell pathways and their roles in the maintenance of cancer stem cell functions.
Collapse
Affiliation(s)
- Qun Lin
- Department of Therapeutic Radiology, Yale University School of Medicine, New Haven, CT, USA
| | | |
Collapse
|
45
|
Abstract
Notch signalling represents a key pathway essential for normal vascular development. Recently, great attention has been focused on the implication of Notch pathway components in postnatal angiogenesis and regenerative medicine. This paper critically reviews the most recent findings supporting the role of Notch in ischaemia-induced neovascularization. Notch signalling reportedly regulates several steps of the reparative process occurring in ischaemic tissues, including sprouting angiogenesis, vessel maturation, interaction of vascular cells with recruited leucocytes and skeletal myocyte regeneration. Further characterization of Notch interaction with other signalling pathways might help identify novel targets for therapeutic angiogenesis.
Collapse
|
46
|
A new role for sterol regulatory element binding protein 1 transcription factors in the regulation of muscle mass and muscle cell differentiation. Mol Cell Biol 2009; 30:1182-98. [PMID: 20028734 DOI: 10.1128/mcb.00690-09] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The role of the transcription factors sterol regulatory element binding protein 1a (SREBP-1a) and SREBP-1c in the regulation of cholesterol and fatty acid metabolism has been well studied; however, little is known about their specific function in muscle. In the present study, analysis of recent microarray data from muscle cells overexpressing SREBP1 suggested that they may play a role in the regulation of myogenesis. We then demonstrated that SREBP-1a and -1c inhibit myoblast-to-myotube differentiation and also induce in vivo and in vitro muscle atrophy. Furthermore, we have identified the transcriptional repressors BHLHB2 and BHLHB3 as mediators of these effects of SREBP-1a and -1c in muscle. Both repressors are SREBP-1 target genes, and they affect the expression of numerous genes involved in the myogenic program. Our findings identify a new role for SREBP-1 transcription factors in muscle, thus linking the control of muscle mass to metabolic pathways.
Collapse
|
47
|
Akiho M, Nakashima H, Sakata M, Yamasa Y, Yamaguchi A, Sakuma K. Expression profile of Notch-1 in mechanically overloaded plantaris muscle of mice. Life Sci 2009; 86:59-65. [PMID: 19945468 DOI: 10.1016/j.lfs.2009.11.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Revised: 10/29/2009] [Accepted: 11/16/2009] [Indexed: 10/20/2022]
Abstract
AIM We investigated the expression pattern of Notch-1 in normal and hypertrophied plantaris muscle of mice. MAIN METHODS We performed immunofluorescence of both Notch-1 and the Notch-1-linking molecules. KEY FINDINGS Immunofluorescence labeling revealed Notch-1 protein in Pax7-positive satellite cells during days 2-6. We observed clear co-localization between Notch-1 and myogenin (4.9+/-1.3%) in the hypertrophied muscle at 4days. Several mononuclei (possibly satellite cells) possessed both Notch-1 and Foxo1 in the plantaris muscle subjected to mechanical overloading (4.1+/-1.2%). SIGNIFICANCE Notch-1 may play an important role in the maintenance of quiescent satellite cells.
Collapse
Affiliation(s)
- Mai Akiho
- Research Center for Physical Fitness, Sports and Health, Toyohashi, University of Technology, 1-1 Hibarigaoka, Tenpaku-cho, Toyohashi, 441-8580, Japan
| | | | | | | | | | | |
Collapse
|
48
|
Relaix F, Marcelle C. Muscle stem cells. Curr Opin Cell Biol 2009; 21:748-53. [PMID: 19932015 DOI: 10.1016/j.ceb.2009.10.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 09/14/2009] [Accepted: 10/06/2009] [Indexed: 12/26/2022]
Abstract
Despite being mainly composed of highly differentiated contractile fibers, the adult skeletal muscle possesses the remarkable ability to regenerate, following injury. The cells that are responsible for this capacity are the satellite cells, a small population of adult stem cells positioned under the basal lamina of muscle fibers and that can give rise to both differentiated myogenic cells while maintaining a stem cell pool by a self-renewal mechanism. We will discuss here recent publications on the developmental origin of muscle stem cells, on the signaling pathways that affect their proliferation and differentiation, with reference to works on skeletal muscle formation in the embryo as well as the adult, using the mouse and chick as reference models.
Collapse
Affiliation(s)
- Frédéric Relaix
- UMR-S 787, INSERM, UPMC-Paris VI, Institute of Myology, Faculty of Medecine Pitié-Salpétrière 105 bd de l'Hôpital, 75634, Paris Cedex 13, France
| | | |
Collapse
|
49
|
Abstract
In recent years, it has become clear that balanced regulation of reactive oxygen species is of critical significance for cell-fate determination as well as for stem cell development, function, and survival. Although many questions regarding intracellular redox status regulation of stem cell fate remain, we review here what is known regarding the impact of cell-fate signaling as shown with a variety of human cancer cells and more recently on cancer-initiating cells and on the regenerative capacity of skeletal muscle and hematopoietic tissue and their stem cells. We also discuss the role of altered intracellular redox status as a potential primary pathogenic mechanism in muscular dystrophy and hematopoietic pathologies. Studies discussed here illustrate how understanding altered redox regulation of stem cell behavior may contribute to the development of novel stem cell therapies.
Collapse
Affiliation(s)
- Shazib Pervaiz
- Department of Physiology, Yong Loo Lin School of Medicine , Singapore
| | | | | |
Collapse
|
50
|
Abstract
Previously, we found that MRFs (myogenic regulatory factors) regulated the expression of PGC-1alpha (peroxisome-proliferator-activated receptor gamma co-activator 1alpha) by targeting a short region, from nt -49 to +2 adjacent to the transcription initiation site, that contained two E-boxes. However, only the E2-box had significant affinity for MRFs, and the E1-box was predicted to be the target of Bhlhe40 (basic helix-loop-helix family, member e40, also known as Stra13, Bhlhb2, DEC1 and Sharp2), a transcriptional repressor implicated in the regulation of several physiological processes. In the present study, by using EMSA (electrophoresis mobility-shift assay), we confirmed that Bhlhe40 targeted the E1-box and formed a complex with the basic helix-loop-helix transcription factor MyoD (myogenic differentiation factor D) on the PGC-1alpha core promoter. We demonstrate that Bhlhe40 binds to the promoters of PGC-1alpha and myogenic genes in vivo and that Bhlhe40 represses the MyoD-mediated transactivation of these promoters. Furthermore, we found that this repression could be relieved by P/CAF (p300/CBP-associated factor) in a dose-dependent manner, but not by CBP [CREB (cAMP-response-element-binding protein)-binding protein]. Bhlhe40 interacted with P/CAF and this interaction disrupted the interaction between P/CAF and MyoD. These results suggest that Bhlhe40 functions as a repressor of MyoD by binding to adjacent E-boxes and sequestering P/CAF from MyoD.
Collapse
|