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Zhang H, Chen C, Liu Y, Chen W, Qi J, Xu Y, Ren L, Yang G, Min D, Liu Z, Cai X, Hao M, Xu G, Hou P. D-galactose causes sinoatrial node dysfunction: from phenotype to mechanism. Aging (Albany NY) 2023; 15:12551-12569. [PMID: 37950730 PMCID: PMC10683603 DOI: 10.18632/aging.205196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/12/2023] [Indexed: 11/13/2023]
Abstract
With the population aging, age-related sinoatrial node dysfunction (SND) has been on the rise. Sinoatrial node (SAN) degeneration is an important factor for the age-related SND development. However, there is no suitable animal modeling method in this field. Here, we investigated whether D-galactose could induce SAN degeneration and explored the associated mechanism. In vivo, twelve C57BL/6 mice were divided into Control and D-galactose group to receive corresponding treatments. Senescence was confirmed by analyzing the hair and weight; cardiac function was evaluated through echocardiography, cerebral blood flux and serum-BNP; the SAN function was evaluated by electrocardiogram; fibrotic change was evaluated by Masson's trichrome staining and oxidative stress was assessed through DHE staining and serum indicators. Mechanism was verified through immunofluorescence-staining and Western blotting. In vitro, mouse-atrial-myocytes were treated with D-galactose, and edaravone was utilized as the ROS scavenger. Senescence, oxidative stress, proliferation ability and mechanism were verified through various methods, and intuitive evidence was obtained through electrophysiological assay. Finally, we concluded that D-galactose can be used to induce age-related SND, in which oxidative stress plays a key role, causing PITX2 ectopic expression and downregulates SHOX2 expression, then through the downstream GATA4/NKX2-5 axis, results in pacing-related ion channels dysfunction, and hence SND development.
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Affiliation(s)
- Heng Zhang
- Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan 250021, China
| | - Chen Chen
- Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Yue Liu
- Shenyang Medical College, Shenyang 110034, China
| | - Wei Chen
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Jing Qi
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Yue Xu
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Lu Ren
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Guanlin Yang
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Dongyu Min
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Zhuang Liu
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Xintong Cai
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Miao Hao
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Guanzhen Xu
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
| | - Ping Hou
- Affiliated Hospital of Liaoning University of Traditional Chinese Medicine, Shenyang 116600, China
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2
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Bao BW, Kang Z, Zhang Y, Li K, Xu R, Guo MY. Selenium Deficiency Leads to Reduced Skeletal Muscle Cell Differentiation by Oxidative Stress in Mice. Biol Trace Elem Res 2023; 201:1878-1887. [PMID: 35576098 DOI: 10.1007/s12011-022-03288-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 05/09/2022] [Indexed: 11/02/2022]
Abstract
Selenium (Se) is one of the essential trace elements in animal organisms with good antioxidant and immune-enhancing abilities. In this study, we investigated the effect and mechanism of Se deficiency on skeletal muscle cell differentiation. A selenium-deficient skeletal muscle model was established. The skeletal muscle tissue and blood Se content were significantly reduced in the Se deficiency group. HE staining showed that the skeletal muscle tissue had a reduced myofiber area and nuclei and an increased myofascicular membrane with Se deficiency. The TUNEL test showed massive apoptosis of skeletal muscle cells in Se deficiency. With Se deficiency, reactive oxygen species (ROS) and malondialdehyde (MDA) increased, and the activities of glutathione peroxidase (GSH-Px), total antioxidant capacity (T-AOC), superoxide dismutase (SOD), and catalase (CAT) were inhibited. In in vitro experiments, microscopic observations showed that the low-Se group had reduced C2C12 cell fusion and a reduced number of differentiated myotubes. In addition, qPCR results showed that differentiation genes (Myog, Myod, Myh2, Myh3, and Myf5) were significantly reduced in the low Se group. Meanwhile, Western blot analysis showed that the levels of differentiation proteins (Myog, Myod, and Myhc) were significantly reduced in the low-Se group. This finding indicates that Se deficiency reduces the expression of skeletal muscle cell differentiation factors. All the above data suggest that Se deficiency can lead to oxidative stress in skeletal muscle, resulting in a reduction in the differentiation capacity of muscle cells.
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Affiliation(s)
- Bo-Wen Bao
- College of Veterinary Medicine, Northeastern Agricultural University, Harbin, 150000, People's Republic of China
| | - Zibo Kang
- Animal Disease Prevention and Control Center of Heilongjiang Province, Harbin, 150000, People's Republic of China
| | - Yu Zhang
- College of Veterinary Medicine, Northeastern Agricultural University, Harbin, 150000, People's Republic of China
| | - Kan Li
- College of Veterinary Medicine, Northeastern Agricultural University, Harbin, 150000, People's Republic of China
| | - Ran Xu
- College of Veterinary Medicine, Northeastern Agricultural University, Harbin, 150000, People's Republic of China
| | - Meng-Yao Guo
- College of Veterinary Medicine, Northeastern Agricultural University, Harbin, 150000, People's Republic of China.
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3
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Jiao J, Curley M, Graca FA, Robles-Murguia M, Shirinifard A, Finkelstein D, Xu B, Fan Y, Demontis F. Modulation of protease expression by the transcription factor Ptx1/PITX regulates protein quality control during aging. Cell Rep 2023; 42:111970. [PMID: 36640359 PMCID: PMC9933915 DOI: 10.1016/j.celrep.2022.111970] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 10/31/2022] [Accepted: 12/20/2022] [Indexed: 01/12/2023] Open
Abstract
Protein quality control is important for healthy aging and is dysregulated in age-related diseases. The autophagy-lysosome and ubiquitin-proteasome are key for proteostasis, but it remains largely unknown whether other proteolytic systems also contribute to maintain proteostasis during aging. Here, we find that expression of proteolytic enzymes (proteases/peptidases) distinct from the autophagy-lysosome and ubiquitin-proteasome systems declines during skeletal muscle aging in Drosophila. Age-dependent protease downregulation undermines proteostasis, as demonstrated by the increase in detergent-insoluble poly-ubiquitinated proteins and pathogenic huntingtin-polyQ levels in response to protease knockdown. Computational analyses identify the transcription factor Ptx1 (homologous to human PITX1/2/3) as a regulator of protease expression. Consistent with this model, Ptx1 protein levels increase with aging, and Ptx1 RNAi counteracts the age-associated downregulation of protease expression. Moreover, Ptx1 RNAi improves muscle protein quality control in a protease-dependent manner and extends lifespan. These findings indicate that proteases and their transcriptional modulator Ptx1 ensure proteostasis during aging.
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Affiliation(s)
- Jianqin Jiao
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Michelle Curley
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Flavia A. Graca
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Maricela Robles-Murguia
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Abbas Shirinifard
- Department of Developmental Neurobiology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - David Finkelstein
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Beisi Xu
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA,Center for Applied Bioinformatics, St. Jude Children’s Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA
| | - Yiping Fan
- Department of Computational Biology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA
| | - Fabio Demontis
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
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4
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Promoter-Adjacent DNA Hypermethylation Can Downmodulate Gene Expression: TBX15 in the Muscle Lineage. EPIGENOMES 2022; 6:epigenomes6040043. [PMID: 36547252 PMCID: PMC9778270 DOI: 10.3390/epigenomes6040043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/01/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
TBX15, which encodes a differentiation-related transcription factor, displays promoter-adjacent DNA hypermethylation in myoblasts and skeletal muscle (psoas) that is absent from non-expressing cells in other lineages. By whole-genome bisulfite sequencing (WGBS) and enzymatic methyl-seq (EM-seq), these hypermethylated regions were found to border both sides of a constitutively unmethylated promoter. To understand the functionality of this DNA hypermethylation, we cloned the differentially methylated sequences (DMRs) in CpG-free reporter vectors and tested them for promoter or enhancer activity upon transient transfection. These cloned regions exhibited strong promoter activity and, when placed upstream of a weak promoter, strong enhancer activity specifically in myoblast host cells. In vitro CpG methylation targeted to the DMR sequences in the plasmids resulted in 86−100% loss of promoter or enhancer activity, depending on the insert sequence. These results as well as chromatin epigenetic and transcription profiles for this gene in various cell types support the hypothesis that DNA hypermethylation immediately upstream and downstream of the unmethylated promoter region suppresses enhancer/extended promoter activity, thereby downmodulating, but not silencing, expression in myoblasts and certain kinds of skeletal muscle. This promoter-border hypermethylation was not found in cell types with a silent TBX15 gene, and these cells, instead, exhibit repressive chromatin in and around the promoter. TBX18, TBX2, TBX3 and TBX1 display TBX15-like hypermethylated DMRs at their promoter borders and preferential expression in myoblasts. Therefore, promoter-adjacent DNA hypermethylation for downmodulating transcription to prevent overexpression may be used more frequently for transcription regulation than currently appreciated.
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5
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Ramírez de Acuña F, Hernandez-Torres F, Rodriguez-Outeiriño L, Dominguez JN, Matias-Valiente L, Sanchez-Fernandez C, Franco D, Aranega AE. Pitx2 Differentially Regulates the Distinct Phases of Myogenic Program and Delineates Satellite Cell Lineages During Muscle Development. Front Cell Dev Biol 2022; 10:940622. [PMID: 35874842 PMCID: PMC9298408 DOI: 10.3389/fcell.2022.940622] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 06/15/2022] [Indexed: 11/13/2022] Open
Abstract
The knowledge of the molecular mechanisms that regulate embryonic myogenesis from early myogenic progenitors to myoblasts, as well as the emergence of adult satellite stem cells (SCs) during development, are key concepts to understanding the genesis and regenerative abilities of the skeletal muscle. Several previous pieces of evidence have revealed that the transcription factor Pitx2 might be a player within the molecular pathways controlling somite-derived muscle progenitors’ fate and SC behavior. However, the role exerted by Pitx2 in the progression from myogenic progenitors to myoblasts including SC precursors remains unsolved. Here, we show that Pitx2 inactivation in uncommitted early myogenic precursors diminished cell proliferation and migration leading to muscle hypotrophy and a low number of SCs with decreased myogenic differentiation potential. However, the loss of Pitx2 in committed myogenic precursors gave rise to normal muscles with standard amounts of SCs exhibiting high levels of Pax7 expression. This SC population includes few MYF5+ SC-primed but increased amount of less proliferative miR-106b+cells, and display myogenic differentiation defects failing to undergo proper muscle regeneration. Overall our results demonstrate that Pitx2 is required in uncommitted myogenic progenitors but it is dispensable in committed precursors for proper myogenesis and reveal a role for this transcription factor in the generation of diverse SC subpopulations.
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Affiliation(s)
- Felícitas Ramírez de Acuña
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Francisco Hernandez-Torres
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
- Department of Biochemistry, Molecular Biology III and Immunology, School of Medicine, University of Granada, Granada, Spain
| | - Lara Rodriguez-Outeiriño
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Jorge N. Dominguez
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Lidia Matias-Valiente
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Cristina Sanchez-Fernandez
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Diego Franco
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
| | - Amelia E. Aranega
- Cardiac and Skeletal Myogenesis Group, Department of Experimental Biology, University of Jaen, Jaén, Spain
- Cardiac and Skeletal Myogenesis Group, MEDINA Foundation, Center for Excellence in Research of Innovative Medicines in Andalusia, Granada, Spain
- *Correspondence: Amelia E. Aranega,
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6
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Papanikolaou K, Veskoukis AS, Draganidis D, Baloyiannis I, Deli CK, Poulios A, Jamurtas AZ, Fatouros IG. Redox-dependent regulation of satellite cells following aseptic muscle trauma: Implications for sports performance and nutrition. Free Radic Biol Med 2020; 161:125-138. [PMID: 33039652 DOI: 10.1016/j.freeradbiomed.2020.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/26/2020] [Accepted: 10/01/2020] [Indexed: 12/21/2022]
Abstract
Skeletal muscle satellite cells (SCs) are indispensable for tissue regeneration, remodeling and growth. Following myotrauma, SCs are activated, and assist in tissue repair. Exercise-induced muscle damage (EIMD) is characterized by a pronounced inflammatory response and the production of reactive oxygen species (ROS). Experimental evidence suggests that SCs kinetics (the propagation from a quiescent to an activated/proliferative state) following EIMD is redox-dependent and interconnected with changes in the SCs microenvironment (niche). Animal studies have shown that following aseptic myotrauma, antioxidant and/or anti-inflammatory supplementation leads to an improved recovery and skeletal muscle regeneration through enhanced SCs kinetics, suggesting a redox-dependent molecular mechanism. Although evidence suggests that antioxidant/anti-inflammatory compounds may prevent performance deterioration and enhance recovery, there is lack of information regarding the redox-dependent regulation of SCs responses following EIMD in humans. In this review, SCs kinetics following aseptic myotrauma, as well as the intrinsic redox-sensitive molecular mechanisms responsible for SCs responses are discussed. The role of redox status on SCs function should be further investigated in the future with human clinical trials in an attempt to elucidate the molecular pathways responsible for muscle recovery and provide information for potential nutritional strategies aiming at performance recovery.
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Affiliation(s)
- Konstantinos Papanikolaou
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece
| | - Aristidis S Veskoukis
- Department of Nutrition and Dietetics, University of Thessaly, Argonafton 1, 42132, Trikala, Greece; Department of Biochemistry and Biotechnology, University of Thessaly, Viopolis, Mezourlo, 41500, Larissa, Greece
| | - Dimitrios Draganidis
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece
| | - Ioannis Baloyiannis
- Department of Surgery, University Hospital of Larissa, Mezourlo, 41110, Larissa, Greece
| | - Chariklia K Deli
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece
| | - Athanasios Poulios
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece
| | - Athanasios Z Jamurtas
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece
| | - Ioannis G Fatouros
- Department of Physical Education and Sport Science, University of Thessaly, Karies, Trikala, 42132, Greece.
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7
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Long X, Gao Y, Liu W, Liu X, Hayashi T, Mizuno K, Hattori S, Ikejima T. Natural flavonoid silibinin promotes the migration and myogenic differentiation of murine C2C12 myoblasts via modulation of ROS generation and down-regulation of estrogen receptor α expression. Mol Cell Biochem 2020; 474:243-261. [PMID: 32789659 DOI: 10.1007/s11010-020-03849-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 07/20/2020] [Indexed: 01/11/2023]
Abstract
Skeletal muscle regeneration is a complex process, involving the proliferation, migration, and differentiation of myoblasts. Recent studies suggest that some natural flavanones stimulate myogenesis. However, the effect of plant estrogen, silibinin, on the regulation of myoblast behaviors is unclarified. In this study, we investigated the effects of silibinin on immortalized murine myoblast C2C12 in the aspects of proliferation, migration, differentiation along with underlying mechanisms. The results show that silibinin at concentrations below 50 μM enhanced the migration and differentiation of C2C12 cells, but had no effect on cell proliferation. Silibinin significantly promoted the production of ROS, which appeared to play important roles in the migration and differentiation of the myoblasts. Interestingly, among ROS, the superoxide anion and hydroxyl radical were associated with the migration, whereas hydrogen peroxide contributed to the myogenic differentiation. We used ER agonist and antagonist to explore whether estrogen receptors (ERs), which are affected by silibinin treatment in the silibinin-enhanced C2C12 migration and differentiation. Migration was independent of ERs, whereas the differentiation was associated with decreased ERα activity. In summary, silibinin treatment increases ROS levels, leading to the promotion of migration and myogenic differentiation. Negative regulation ERα of differentiation but not of migration may suggest that ERα represses hydrogen peroxide generation. The effect of silibinin on myoblast migration and differentiation suggests that silibinin may have therapeutic benefits for muscle regeneration.
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Affiliation(s)
- Xinyu Long
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China
| | - Yanfang Gao
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China
| | - Weiwei Liu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China
| | - Xiaoling Liu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China
| | - Toshihiko Hayashi
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China.,Department of Chemistry and Life Science, School of Advanced Engineering, Kogakuin University, 2665-1, Nakanomachi, Hachioji, Tokyo, 192-0015, Japan
| | - Kazunori Mizuno
- Nippi Research Institute of Biomatrix, Ibaraki, 649-1211, Japan
| | - Shunji Hattori
- Nippi Research Institute of Biomatrix, Ibaraki, 649-1211, Japan
| | - Takashi Ikejima
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, Liaoning, People's Republic of China. .,Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development Liaoning Province, 103 Wenhua Road, Shenyang, 110016, Liaoning, China. .,China-Japan Research Institute of Medical and Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, Liaoning, China.
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8
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Guanine-rich RNA binding protein GRSF1 inhibits myoblast differentiation through repressing mitochondrial ROS production. Exp Cell Res 2019; 381:139-149. [DOI: 10.1016/j.yexcr.2019.05.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Revised: 05/02/2019] [Accepted: 05/03/2019] [Indexed: 12/23/2022]
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9
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García-Prat L, Sousa-Victor P, Muñoz-Cánoves P. Proteostatic and Metabolic Control of Stemness. Cell Stem Cell 2018; 20:593-608. [PMID: 28475885 DOI: 10.1016/j.stem.2017.04.011] [Citation(s) in RCA: 91] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Adult stem cells, particularly those resident in tissues with little turnover, are largely quiescent and only activate in response to regenerative demands, while embryonic stem cells continuously replicate, suggesting profoundly different regulatory mechanisms within distinct stem cell types. In recent years, evidence linking metabolism, mitochondrial dynamics, and protein homeostasis (proteostasis) as fundamental regulators of stem cell function has emerged. Here, we discuss new insights into how these networks control potency, self-renewal, differentiation, and aging of highly proliferative embryonic stem cells and quiescent adult stem cells, with a focus on hematopoietic and muscle stem cells and implications for anti-aging research.
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Affiliation(s)
- Laura García-Prat
- Department of Experimental and Health Sciences, Pompeu Fabra University (UPF), CIBER on Neurodegenerative Diseases (CIBERNED), E-08003 Barcelona, Spain; Spanish National Center on Cardiovascular Research (CNIC), E-28029 Madrid, Spain; Princess Margaret Cancer Centre, University Health Network, Toronto, ON M5G 2M9, Canada
| | - Pedro Sousa-Victor
- Paul F. Glenn Center for Biology of Aging Research, Buck Institute for Research on Aging, Novato, CA 94945-1400, USA
| | - Pura Muñoz-Cánoves
- Department of Experimental and Health Sciences, Pompeu Fabra University (UPF), CIBER on Neurodegenerative Diseases (CIBERNED), E-08003 Barcelona, Spain; Spanish National Center on Cardiovascular Research (CNIC), E-28029 Madrid, Spain; ICREA, E-08010 Barcelona, Spain.
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10
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Hernandez-Torres F, Rodríguez-Outeiriño L, Franco D, Aranega AE. Pitx2 in Embryonic and Adult Myogenesis. Front Cell Dev Biol 2017; 5:46. [PMID: 28507987 PMCID: PMC5410577 DOI: 10.3389/fcell.2017.00046] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 04/12/2017] [Indexed: 12/11/2022] Open
Abstract
Skeletal muscle is a heterogeneous tissue that represents between 30 and 38% of the human body mass and has important functions in the organism, such as maintaining posture, locomotor impulse, or pulmonary ventilation. The genesis of skeletal muscle during embryonic development is a process controlled by an elaborate regulatory network combining the interplay of extrinsic and intrinsic regulatory mechanisms that transform myogenic precursor cells into functional muscle fibers through a finely tuned differentiation program. However, the capacity of generating muscle still remains once these fibers have matured. Adult myogenesis resembles many of the embryonic morphogenetic episodes and depends on the activation of satellite cells that have the potential to differentiate into new muscle fibers. Pitx2 is a member of the bicoid family of homeodomain transcription factors that play an important role in morphogenesis. In the last decade, Pitx2 has emerged as a key element involved in the fine-tuning mechanism that regulates skeletal-muscle development as well as the differentiation and cell fate of satellite cells in adult muscle. Here we present an integrative view of all aspects of embryonic and adult myogenesis in which Pitx2 is involved, from embryonic development to satellite-cell proliferation, fate specification, and differentiation. Those new Pitx2 functions on satellite-cell biology might open new perspectives to develop therapeutic strategies for muscular disorders.
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Affiliation(s)
- Francisco Hernandez-Torres
- Cardiac and Skeletal Myogenesis Group, Departmento de Biología Experimental, Universidad de JaénJaén, Spain.,Cardiac and Skeletal Myogenesis Group, Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores en AndalucíaGranada, Spain
| | - Lara Rodríguez-Outeiriño
- Cardiac and Skeletal Myogenesis Group, Departmento de Biología Experimental, Universidad de JaénJaén, Spain.,Cardiac and Skeletal Myogenesis Group, Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores en AndalucíaGranada, Spain
| | - Diego Franco
- Cardiac and Skeletal Myogenesis Group, Departmento de Biología Experimental, Universidad de JaénJaén, Spain.,Cardiac and Skeletal Myogenesis Group, Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores en AndalucíaGranada, Spain
| | - Amelia E Aranega
- Cardiac and Skeletal Myogenesis Group, Departmento de Biología Experimental, Universidad de JaénJaén, Spain.,Cardiac and Skeletal Myogenesis Group, Fundación MEDINA Centro de Excelencia en Investigación de Medicamentos Innovadores en AndalucíaGranada, Spain
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11
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Ponnaluri VKC, Ehrlich KC, Zhang G, Lacey M, Johnston D, Pradhan S, Ehrlich M. Association of 5-hydroxymethylation and 5-methylation of DNA cytosine with tissue-specific gene expression. Epigenetics 2017; 12:123-138. [PMID: 27911668 PMCID: PMC5330441 DOI: 10.1080/15592294.2016.1265713] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 11/10/2016] [Accepted: 11/21/2016] [Indexed: 12/15/2022] Open
Abstract
Differentially methylated or hydroxymethylated regions (DMRs) in mammalian DNA are often associated with tissue-specific gene expression but the functional relationships are still being unraveled. To elucidate these relationships, we studied 16 human genes containing myogenic DMRs by analyzing profiles of their epigenetics and transcription and quantitatively assaying 5-hydroxymethylcytosine (5hmC) and 5-methylcytosine (5mC) at specific sites in these genes in skeletal muscle (SkM), myoblasts, heart, brain, and diverse other samples. Although most human promoters have little or no methylation regardless of expression, more than half of the genes that we chose to study-owing to their myogenic DMRs-overlapped tissue-specific alternative or cryptic promoters displaying corresponding tissue-specific differences in histone modifications. The 5mC levels in myoblast DMRs were significantly associated with 5hmC levels in SkM at the same site. Hypermethylated myogenic DMRs within CDH15, a muscle- and cerebellum-specific cell adhesion gene, and PITX3, a homeobox gene, were used for transfection in reporter gene constructs. These intragenic DMRs had bidirectional tissue-specific promoter activity that was silenced by in vivo-like methylation. The CDH15 DMR, which was previously associated with an imprinted maternal germline DMR in mice, had especially strong promoter activity in myogenic host cells. These findings are consistent with the controversial hypothesis that intragenic DNA methylation can facilitate transcription and is not just a passive consequence of it. Our results support varied roles for tissue-specific 5mC- or 5hmC-enrichment in suppressing inappropriate gene expression from cryptic or alternative promoters and in increasing the plasticity of gene expression required for development and rapid responses to tissue stress or damage.
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Affiliation(s)
| | - Kenneth C. Ehrlich
- Center for Bioinformatics and Genomics, Tulane University Health Sciences Center, New Orleans, LA, USA
| | | | - Michelle Lacey
- Department of Mathematics, Tulane Health Sciences Center and Tulane University, New Orleans, LA, USA
| | - Douglas Johnston
- Department of Microbiology, Immunology and Parasitology, LSU Health Sciences Center, New Orleans, LA, USA
| | | | - Melanie Ehrlich
- Center for Bioinformatics and Genomics, Tulane University Health Sciences Center, New Orleans, LA, USA
- Hayward Genetics Center and Tulane Cancer Center, Tulane University Health Sciences Center, New Orleans, LA, USA
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Samant M, Chauhan BK, Lathrop KL, Nischal KK. Congenital aniridia: etiology, manifestations and management. EXPERT REVIEW OF OPHTHALMOLOGY 2016; 11:135-144. [PMID: 30100922 DOI: 10.1586/17469899.2016.1152182] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Congenital aniridia manifests as total or partial absence of the iris caused most commonly by mutations in PAX6, FOXC1, PITX2, and CYP1B1. Recently two new genes, FOXD3 and TRIM44, have also been implicated in isolated studies. We discuss the genotype-phenotype correlations for the main implicated genes. Classic aniridia is a panocular condition, which includes aniridia, cataract, corneal pannus, foveal, and optic nerve hypoplasia associated with mutations in the PAX6 gene. Classical aniridia is due to PAX6 mutations, while other genes contribute to aniridia-like phenotypes. We review the challenges involved in the management of aniridia, and discuss various surgical interventions. The clinical importance of defining the genotype in cases of congenital aniridia has become acutely apparent with the advent of possible therapies for classical aniridia, which are discussed.
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Affiliation(s)
- Monica Samant
- Children's Eye Center of UPMC, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, 15213, USA
| | - Bharesh K Chauhan
- Children's Eye Center of UPMC, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, 15213, USA.,Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA
| | - Kira L Lathrop
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA.,Department of Engineering. University of Pittsburgh Swanson School of Engineering, Pittsburgh, Pennsylvania 15213, USA
| | - Ken K Nischal
- Children's Eye Center of UPMC, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, 15213, USA.,Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, USA
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