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Ji E, Pandey PR, Martindale JL, Yang X, Yang JH, Tsitsipatis D, Shin CH, Piao Y, Fan J, Mazan-Mamczarz K, Banskota N, De S, Gorospe M. FUS-Mediated Inhibition of Myogenesis Elicited by Suppressing TNNT1 Production. Mol Cell Biol 2024:1-19. [PMID: 39133076 DOI: 10.1080/10985549.2024.2383296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Revised: 07/17/2024] [Accepted: 07/17/2024] [Indexed: 08/13/2024] Open
Abstract
Myogenesis is a highly orchestrated process whereby muscle precursor cells, myoblasts, develop into muscle fibers to form skeletal muscle during embryogenesis and regenerate adult muscle. Here, we studied the RNA-binding protein FUS (fused in sarcoma), which has been implicated in muscular and neuromuscular pathologies but is poorly characterized in myogenesis. Given that FUS levels declined in human and mouse models of skeletal myogenesis, and that silencing FUS enhanced myogenesis, we hypothesized that FUS might be a repressor of myogenic differentiation. Interestingly, overexpression of FUS delayed myogenesis, accompanied by slower production of muscle differentiation markers. To identify the mechanisms through which FUS inhibits myogenesis, we uncovered RNA targets of FUS by ribonucleoprotein immunoprecipitation (RIP) followed by RNA-sequencing (RNA-seq) analysis. Stringent selection of the bound transcripts uncovered Tnnt1 mRNA, encoding troponin T1 (TNNT1), as a major effector of FUS influence on myogenesis. We found that in myoblasts, FUS retained Tnnt1 mRNA in the nucleus, preventing TNNT1 expression; however, reduction of FUS during myogenesis or by silencing FUS released Tnnt1 mRNA for export to the cytoplasm, enabling TNNT1 translation and promoting myogenesis. We propose that FUS inhibits myogenesis by suppressing TNNT1 expression through a mechanism of nuclear Tnnt1 mRNA retention.
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Affiliation(s)
- Eunbyul Ji
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Poonam R Pandey
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Xiaoling Yang
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Jen-Hao Yang
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
- Institute of Biomedical Sciences, National Sun Yat-sen University, Kaohsiung, Taiwan
| | - Dimitrios Tsitsipatis
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Chang Hoon Shin
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Yulan Piao
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Jinshui Fan
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Krystyna Mazan-Mamczarz
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Nirad Banskota
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Supriyo De
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
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2
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Wang X, Zhang J, Su J, Huang T, Lian L, Nie Q, Zhang X, Li J, Wang Y. Genome-wide mapping of the binding sites of myocyte enhancer factor 2A in chicken primary myoblasts. Poult Sci 2024; 103:104097. [PMID: 39094502 PMCID: PMC11345569 DOI: 10.1016/j.psj.2024.104097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 07/04/2024] [Accepted: 07/09/2024] [Indexed: 08/04/2024] Open
Abstract
Myocyte enhancer factor 2A (MEF2A) is a transcription factor that plays a critical role in cell proliferation, differentiation and apoptosis. In contrast to the wide characterization of its regulation mechanism in mammalian skeletal muscle, its role in chickens is limited. Especially, its wide target genes remain to be identified. Therefore, we utilized Cleavage Under Targets and Tagmentation (CUT&Tag) technology to reveal the genome-wide binding profile of MEF2A in chicken primary myoblasts thus gaining insights into its potential role in muscle development. Our results revealed that MEF2A binding sites were primarily distributed in intergenic and intronic regions. Within the promoter region, although only 8.87% of MEF2A binding sites were found, these binding sites were concentrated around the transcription start site (TSS). Following peak annotation, a total of 1903 genes were identified as potential targets of MEF2A. Gene Ontology (GO) enrichment analysis further revealed that MEF2A target genes may be involved in the regulation of embryonic development in multiple organ systems, including muscle development, gland development, and visual system development. Moreover, a comparison of the MEF2A target genes identified in chicken primary myoblasts with those in mouse C2C12 cells revealed 388 target genes are conserved across species, 1515 target genes are chicken specific. Among these conserved genes, ankyrin repeat and SOCS box containing 5 (ASB5), transmembrane protein 182 (TMEM182), myomesin 2 (MYOM2), leucyl and cystinyl aminopeptidase (LNPEP), actinin alpha 2 (ACTN2), sorbin and SH3 domain containing 1 (SORBS1), ankyrin 3 (ANK3), sarcoglycan delta (SGCD), and ORAI calcium release-activated calcium modulator 1 (ORAI1) exhibited consistent expression patterns with MEF2A during embryonic muscle development. Finally, TMEM182, as an important negative regulator of muscle development, has been validated to be regulated by MEF2A by dual-luciferase and quantitative real-time PCR (qPCR) assays. In summary, our study for the first time provides a wide landscape of MEF2A target genes in chicken primary myoblasts, which supports the active role of MEF2A in chicken muscle development.
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Affiliation(s)
- Xinglong Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Jiannan Zhang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Jiancheng Su
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Tianjiao Huang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China
| | - Ling Lian
- National Engineering Laboratory for Animal Breeding and MOA Key Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, PR China
| | - Qinghua Nie
- Lingnan Guangdong Laboratory of Agriculture, South China Agricultural University, Guangzhou, PR China
| | - Xin Zhang
- Joint Nutrition Center for Animal Feeding of Sichuan University-Shengliyuan Group
| | - Juan Li
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China; Joint Nutrition Center for Animal Feeding of Sichuan University-Shengliyuan Group
| | - Yajun Wang
- Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu 610065, PR China; Joint Nutrition Center for Animal Feeding of Sichuan University-Shengliyuan Group.
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3
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Lozano-Velasco E, Garcia-Padilla C, Carmona-Garcia M, Gonzalez-Diaz A, Arequipa-Rendon A, Aranega AE, Franco D. MEF2C Directly Interacts with Pre-miRNAs and Distinct RNPs to Post-Transcriptionally Regulate miR-23a-miR-27a-miR-24-2 microRNA Cluster Member Expression. Noncoding RNA 2024; 10:32. [PMID: 38804364 PMCID: PMC11130849 DOI: 10.3390/ncrna10030032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 05/11/2024] [Accepted: 05/15/2024] [Indexed: 05/29/2024] Open
Abstract
Transcriptional regulation constitutes a key step in gene expression regulation. Myocyte enhancer factor 2C (MEF2C) is a transcription factor of the MADS box family involved in the early development of several cell types, including muscle cells. Over the last decade, a novel layer of complexity modulating gene regulation has emerged as non-coding RNAs have been identified, impacting both transcriptional and post-transcriptional regulation. microRNAs represent the most studied and abundantly expressed subtype of small non-coding RNAs, and their functional roles have been widely documented. On the other hand, our knowledge of the transcriptional and post-transcriptional regulatory mechanisms that drive microRNA expression is still incipient. We recently demonstrated that MEF2C is able to transactivate the long, but not short, regulatory element upstream of the miR-23a-miR-27a-miR-24-2 transcriptional start site. However, MEF2C over-expression and silencing, respectively, displayed distinct effects on each of the miR-23a-miR-27a-miR-24-2 mature cluster members without affecting pri-miRNA expression levels, thus supporting additional MEF2C-driven regulatory mechanisms. Within this study, we demonstrated a complex post-transcriptional regulatory mechanism directed by MEF2C in the regulation of miR-23a-miR-27a-miR-24-2 cluster members, distinctly involving different domains of the MEF2C transcription factor and the physical interaction with pre-miRNAs and Ksrp, HnRNPa3 and Ddx17 transcripts.
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Affiliation(s)
- Estefanía Lozano-Velasco
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
- Fundación Medina, 18016 Granada, Spain
| | - Carlos Garcia-Padilla
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
- Department of Anatomy, Embryology and Zoology, School of Medicine, University of Extremadura, 06006 Badajoz, Spain
| | - Miguel Carmona-Garcia
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
| | - Alba Gonzalez-Diaz
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
| | - Angela Arequipa-Rendon
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
| | - Amelia E. Aranega
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
- Fundación Medina, 18016 Granada, Spain
| | - Diego Franco
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaen, 23071 Jaen, Spain; (E.L.-V.); (C.G.-P.); (M.C.-G.); (A.G.-D.); (A.A.-R.); (A.E.A.)
- Fundación Medina, 18016 Granada, Spain
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Acharya P, Parkins S, Tranter M. RNA binding proteins as mediators of pathological cardiac remodeling. Front Cell Dev Biol 2024; 12:1368097. [PMID: 38818408 PMCID: PMC11137256 DOI: 10.3389/fcell.2024.1368097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 05/01/2024] [Indexed: 06/01/2024] Open
Abstract
RNA binding proteins (RBPs) play a central in the post-transcriptional regulation of gene expression, which can account for up to 50% of all variations in protein expression within a cell. Following their binding to target RNAs, RBPs most typically confer changes in gene expression through modulation of alternative spicing, RNA stabilization/degradation, or ribosome loading/translation rate. All of these post-transcriptional regulatory processes have been shown to play a functional role in pathological cardiac remodeling, and a growing body of evidence is beginning to identify the mechanistic contribution of individual RBPs and their cardiac RNA targets. This review highlights the mechanisms of RBP-dependent post-transcriptional gene regulation in cardiomyocytes and fibroblasts and our current understanding of how RNA binding proteins functionally contribute to pathological cardiac remodeling.
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Affiliation(s)
- Pooja Acharya
- Department of Molecular Medicine and Therapeutics, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Sharon Parkins
- Department of Molecular Medicine and Therapeutics, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Department of Internal Medicine, Division of Cardiovascular Health and Disease, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Michael Tranter
- Department of Molecular Medicine and Therapeutics, The Ohio State University Wexner Medical Center, Columbus, OH, United States
- Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, United States
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5
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Li P, Feng X, Ma Z, Yuan Y, Jiang H, Xu G, Zhu Y, Yang X, Wang Y, Zhu C, Wang S, Gao P, Jiang Q, Shu G. Microbiota-derived 3-phenylpropionic acid promotes myotube hypertrophy by Foxo3/NAD + signaling pathway. Cell Biosci 2024; 14:62. [PMID: 38750565 PMCID: PMC11097579 DOI: 10.1186/s13578-024-01244-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 05/03/2024] [Indexed: 05/18/2024] Open
Abstract
BACKGROUND Gut microbiota and their metabolites play a regulatory role in skeletal muscle growth and development, which be known as gut-muscle axis. 3-phenylpropionic acid (3-PPA), a metabolite produced by colonic microorganisms from phenylalanine in the gut, presents in large quantities in the blood circulation. But few study revealed its function in skeletal muscle development. RESULTS Here, we demonstrated the beneficial effects of 3-PPA on muscle mass increase and myotubes hypertrophy both in vivo and vitro. Further, we discovered the 3-PPA effectively inhibited protein degradation and promoted protein acetylation in C2C12 and chick embryo primary skeletal muscle myotubes. Mechanistically, we supported that 3-PPA reduced NAD+ synthesis and subsequently suppressed tricarboxylic acid cycle and the mRNA expression of SIRT1/3, thus promoting the acetylation of total protein and Foxo3. Moreover, 3-PPA may inhibit Foxo3 activity by directly binding. CONCLUSIONS This study firstly revealed the effect of 3-PPA on skeletal muscle growth and development, and newly discovered the interaction between 3-PPA and Foxo3/NAD+ which mechanically promote myotubes hypertrophy. These results expand new understanding for the regulation of gut microbiota metabolites on skeletal muscle growth and development.
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Affiliation(s)
- Penglin Li
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Xiaohua Feng
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Zewei Ma
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Yexian Yuan
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Hongfeng Jiang
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Guli Xu
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Yunlong Zhu
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Xue Yang
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Yujun Wang
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Canjun Zhu
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Songbo Wang
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Ping Gao
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China
| | - Qingyan Jiang
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
- National Engineering Research Center for Breeding Swine Industry, College of Animal Science, South China Agricultural University, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
- Key Laboratory of Animal Nutritional Regulation, College of Animal Science, South China Agricultural University, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
| | - Gang Shu
- State Key Laboratory of Swine and Poultry Breeding Industry, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
- Guangdong Laboratory for Lingnan Modern Agricultural and Guangdong Province, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
- Key Laboratory of Animal Nutritional Regulation, College of Animal Science, South China Agricultural University, Tianhe District, 483 Wushan Road, Guangzhou, 510642, Guangdong, China.
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Wang R, Kato F, Watson RY, Beedle AM, Call JA, Tsunoda Y, Noda T, Tsuchiya T, Kashima M, Hattori A, Ito T. The RNA-binding protein Msi2 regulates autophagy during myogenic differentiation. Life Sci Alliance 2024; 7:e202302016. [PMID: 38373797 PMCID: PMC10876439 DOI: 10.26508/lsa.202302016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 02/21/2024] Open
Abstract
Skeletal muscle development is a highly ordered process orchestrated transcriptionally by the myogenic regulatory factors. However, the downstream molecular mechanisms of myogenic regulatory factor functions in myogenesis are not fully understood. Here, we identified the RNA-binding protein Musashi2 (Msi2) as a myogenin target gene and a post-transcriptional regulator of myoblast differentiation. Msi2 knockdown in murine myoblasts blocked differentiation without affecting the expression of MyoD or myogenin. Msi2 overexpression was also sufficient to promote myoblast differentiation and myocyte fusion. Msi2 loss attenuated autophagosome formation via down-regulation of the autophagic protein MAPL1LC3/ATG8 (LC3) at the early phase of myoblast differentiation. Moreover, forced activation of autophagy effectively suppressed the differentiation defects incurred by Msi2 loss. Consistent with its functions in myoblasts in vitro, mice deficient for Msi2 exhibited smaller limb skeletal muscles, poorer exercise performance, and muscle fiber-type switching in vivo. Collectively, our study demonstrates that Msi2 is a novel regulator of mammalian myogenesis and establishes a new functional link between muscular development and autophagy regulation.
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Affiliation(s)
- Ruochong Wang
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
- https://ror.org/00te3t702 Department of Biochemistry and Molecular Biology, The University of Georgia, Athens, GA, USA
| | - Futaba Kato
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Rio Yasui Watson
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
- https://ror.org/00te3t702 Department of Biochemistry and Molecular Biology, The University of Georgia, Athens, GA, USA
| | - Aaron M Beedle
- https://ror.org/00te3t702 Department of Pharmaceutical and Biomedical Sciences, The University of Georgia, Athens, GA, USA
- Department of Pharmaceutical Sciences, SUNY Binghamton University, New York, NY, USA
| | - Jarrod A Call
- https://ror.org/00te3t702 Department of Physiology & Pharmacology, The University of Georgia, Athens, GA, USA
| | - Yugo Tsunoda
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Takeshi Noda
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Takaho Tsuchiya
- Bioinformatics Laboratory, Institute of Medicine, and Center for Artificial Intelligence Research, University of Tsukuba, Tsukuba, Japan
| | - Makoto Kashima
- College of Science and Engineering, Aoyama Gakuin University, Kanagawa, Japan
- Department of Molecular Biology, Faculty of Science, Toho University, Chiba, Japan
| | - Ayuna Hattori
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
- https://ror.org/00te3t702 Department of Biochemistry and Molecular Biology, The University of Georgia, Athens, GA, USA
| | - Takahiro Ito
- https://ror.org/02kpeqv85 Institute for Life and Medical Sciences, Kyoto University, Kyoto, Japan
- https://ror.org/00te3t702 Department of Biochemistry and Molecular Biology, The University of Georgia, Athens, GA, USA
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Li J, Wang X, Shi L, Liu B, Sheng Z, Chang S, Cai X, Shan G. A Mammalian Conserved Circular RNA CircLARP1B Regulates Hepatocellular Carcinoma Metastasis and Lipid Metabolism. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305902. [PMID: 37953462 PMCID: PMC10787103 DOI: 10.1002/advs.202305902] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 10/14/2023] [Indexed: 11/14/2023]
Abstract
Circular RNAs (circRNAs) have emerged as crucial regulators in physiology and human diseases. However, evolutionarily conserved circRNAs with potent functions in cancers are rarely reported. In this study, a mammalian conserved circRNA circLARP1B is identified to play critical roles in hepatocellular carcinoma (HCC). Patients with high circLARP1B levels have advanced prognostic stage and poor overall survival. CircLARP1B facilitates cellular metastatic properties and lipid accumulation through promoting fatty acid synthesis in HCC. CircLARP1B deficient mice exhibit reduced metastasis and less lipid accumulation in an induced HCC model. Multiple lines of evidence demonstrate that circLARP1B binds to heterogeneous nuclear ribonucleoprotein D (HNRNPD) in the cytoplasm, and thus affects the binding of HNRNPD to sensitive transcripts including liver kinase B1 (LKB1) mRNA. This regulation causes decreased LKB1 mRNA stability and lower LKB1 protein levels. Antisense oligodeoxynucleotide complementary to theHNRNPD binding sites in circLARP1B increases the HNRNPD binding to LKB1 mRNA. Through the HNRNPD-LKB1-AMPK pathway, circLARP1B promotes HCC metastasis and lipid accumulation. Results from AAV8-mediated hepatocyte-directed knockdown of circLARP1B or Lkb1 in mouse models also demonstrate critical roles of hepatocytic circLARP1B regulatory pathway in HCC metastasis and lipid accumulation, and indicate that circLARP1B may be potential target of HCC treatment.
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Affiliation(s)
- Jingxin Li
- Department of Laboratory MedicineThe First Affiliated Hospital of USTCThe CAS Key Laboratory of Innate Immunity and Chronic DiseaseSchool of Basic Medical SciencesDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei230027China
| | - Xiaolin Wang
- Department of Laboratory MedicineThe First Affiliated Hospital of USTCThe CAS Key Laboratory of Innate Immunity and Chronic DiseaseSchool of Basic Medical SciencesDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei230027China
| | - Liang Shi
- Department of General SurgerySir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310016China
| | - Boqiang Liu
- Department of General SurgerySir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310016China
| | - Zhiyong Sheng
- School of Life ScienceBengbu Medical CollegeBengbu233030China
| | - Shuhui Chang
- Department of Laboratory MedicineThe First Affiliated Hospital of USTCThe CAS Key Laboratory of Innate Immunity and Chronic DiseaseSchool of Basic Medical SciencesDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei230027China
| | - Xiujun Cai
- Department of General SurgerySir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310016China
| | - Ge Shan
- Department of Laboratory MedicineThe First Affiliated Hospital of USTCThe CAS Key Laboratory of Innate Immunity and Chronic DiseaseSchool of Basic Medical SciencesDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei230027China
- Department of Pulmonary and Critical Care MedicineRegional Medical Center for National Institute of Respiratory DiseasesSir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310016China
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8
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Li Z, Wei H, Hu D, Li X, Guo Y, Ding X, Guo H, Zhang L. Research Progress on the Structural and Functional Roles of hnRNPs in Muscle Development. Biomolecules 2023; 13:1434. [PMID: 37892116 PMCID: PMC10604023 DOI: 10.3390/biom13101434] [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: 09/04/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 10/29/2023] Open
Abstract
Heterogeneous nuclear ribonucleoproteins (hnRNPs) are a superfamily of RNA-binding proteins consisting of more than 20 members. These proteins play a crucial role in various biological processes by regulating RNA splicing, transcription, and translation through their binding to RNA. In the context of muscle development and regeneration, hnRNPs are involved in a wide range of regulatory mechanisms, including alternative splicing, transcription regulation, miRNA regulation, and mRNA stability regulation. Recent studies have also suggested a potential association between hnRNPs and muscle-related diseases. In this report, we provide an overview of our current understanding of how hnRNPs regulate RNA metabolism and emphasize the significance of the key members of the hnRNP family in muscle development. Furthermore, we explore the relationship between the hnRNP family and muscle-related diseases.
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Affiliation(s)
| | | | | | | | | | | | | | - Linlin Zhang
- Key Laboratory of Animal Breeding and Healthy Livestock Farming, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin 300392, China; (Z.L.); (H.W.); (D.H.); (X.L.); (Y.G.); (X.D.); (H.G.)
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9
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Zhang Z, Fan W, Gao Q, Han Y, Ma J, Gao W, Hu Y, Zhu H, Yang R, Wang H, Du B, Zhang Z, Zhong J. Hsa_Circ_0000826 inhibits the proliferation of colorectal cancer by targeting AUF1. J Genet Genomics 2023; 50:192-203. [PMID: 35940521 DOI: 10.1016/j.jgg.2022.07.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/25/2022] [Accepted: 07/28/2022] [Indexed: 11/17/2022]
Abstract
Many circular RNAs (circRNAs) are reported to be abnormally expressed during the progression of various tumors, and these circRNAs can be used as anti-tumor targets. Therefore, it is important to identify circRNAs that can be used effectively for the clinical diagnosis and treatment of colorectal cancer (CRC). Here, we report that hsa_Circ_0000826 (Circ_0000826), a circRNA with significantly reduced expression level in CRC tissues, is associated with a poor prognosis in patients. The silencing of Circ_0000826 promotes the proliferation of CRC cells. Conversely, the overexpression of Circ_0000826 restricted CRC cell proliferation both in vitro and in vivo. Furthermore, Circ_0000826 could target AU-rich element RNA-binding protein 1 (AUF1). AUF1, known as heterogeneous nuclear ribonucleoprotein D (hnRNP D), could bind to the c-MYC 3'-UTR and promote c-MYC expression. When Circ_0000826 binds to AUF1, it competitively inhibits the binding of AUF1 to the c-MYC 3'-UTR, which inhibits the c-MYC expression and cell proliferation. These results provide novel insights into the functional mechanism of Circ_0000826 action in CRC progression and indicate its potential use as a therapeutic target in CRC.
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Affiliation(s)
- Zheying Zhang
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Wenyan Fan
- Department of Microscopic Morphology Laboratory, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Qingzu Gao
- Department of Pathology, The First Affiliated Hospital of Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Yifei Han
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Jingyu Ma
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Wuji Gao
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Yuhan Hu
- Department of Microscopic Morphology Laboratory, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Huifang Zhu
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Rui Yang
- School of Life Science and Technology, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Haijun Wang
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China
| | - Baoshun Du
- Second Department of Neurosurgery, Xinxiang Central Hospital, Xinxiang, Henan 453003, China
| | - Zuoyang Zhang
- Department of Pathology, Anhui Medical University, Hefei, Anhui 230032, China.
| | - Jiateng Zhong
- Department of Pathology, School of Basic Medical Sciences, Xinxiang Medical University, Xinxiang, Henan 453003, China.
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10
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Kim HJ, Kim SW, Lee SH, Jung DW, Williams DR. Inhibiting 5-lipoxygenase prevents skeletal muscle atrophy by targeting organogenesis signalling and insulin-like growth factor-1. J Cachexia Sarcopenia Muscle 2022; 13:3062-3077. [PMID: 36221153 PMCID: PMC9745465 DOI: 10.1002/jcsm.13092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 08/05/2022] [Accepted: 09/02/2022] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Skeletal muscle atrophy can occur in response to numerous factors, such as ageing and certain medications, and produces a major socio-economic burden. At present, there are no approved drugs for treating skeletal muscle atrophy. Arachidonate 5-lipoxygenase (Alox5) is a drug target for a number of diseases. However, pharmacological targeting of Alox5, and its role in skeletal muscle atrophy, is unclear. METHODS The potential effects of gene knockdown and pharmacological targeting of Alox5 on skeletal muscle atrophy were investigated using cell-based models, animal models and human skeletal muscle primary cells. Malotilate, a clinically safe drug developed for enhancing liver regeneration and Alox5 inhibitor, was investigated as a repurposing candidate. Mechanism(s) of action in skeletal muscle atrophy was assessed by measuring the expression level or activation status of key regulatory pathways and validated using gene knockdown and RNA sequencing. RESULTS Myotubes treated with the atrophy-inducing glucocorticoid, dexamethasone, were protected from catabolic responses by treatment with malotilate (+41.29%, P < 0.01). Similar anti-atrophy effects were achieved by gene knockdown of Alox5 (+30.4%, P < 0.05). Malotilate produced anti-atrophy effects without affecting the myogenic differentiation programme. In an in vivo model of skeletal muscle atrophy, malotilate treatment preserved muscle force/strength (grip strength: +35.72%, latency to fall: +553.1%, P < 0.05), increased mass and fibre cross-sectional area (quadriceps: +23.72%, soleus: +33.3%, P < 0.01) and down-regulated atrogene expression (Atrogin-1: -61.58%, Murf-1: -66.06%, P < 0.01). Similar, beneficial effects of malotilate treatment were observed in an ageing muscle model, which also showed the preservation of fast-twitch fibres (Type 2a: +56.48%, Type 2b: +37.32%, P < 0.01). Leukotriene B4, a product of Alox5 activity with inflammatory and catabolic functions, was found to be elevated in skeletal muscle undergoing atrophy (quadriceps: +224.4%, P < 0.001). Cellular transcriptome analysis showed that targeting Alox5 up-regulated biological processes regulating organogenesis and increased the expression of insulin-like growth factor-1, a key anti-atrophy hormone (+226.5%, P < 0.05). Interestingly, these effects were restricted to the atrophy condition and not observed in normal skeletal muscle cultures with Alox5 inhibition. Human myotubes were also protected from atrophy by pharmacological targeting of Alox5 (+23.68%, P < 0.05). CONCLUSIONS These results shed new light on novel drug targets and mechanisms underpinning skeletal muscle atrophy. Alox5 is a regulator and drug target for muscle atrophy, and malotilate is an attractive compound for repurposing studies to treat this disease.
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Affiliation(s)
- Hyun-Jun Kim
- New Drug Targets Laboratory, School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Seon-Wook Kim
- New Drug Targets Laboratory, School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Sang-Hoon Lee
- New Drug Targets Laboratory, School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Da-Woon Jung
- New Drug Targets Laboratory, School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
| | - Darren R Williams
- New Drug Targets Laboratory, School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, South Korea
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11
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Jo YW, Park I, Yoo K, Woo HY, Kim YL, Kim YE, Kim JH, Kong YY. Notch1 and Notch2 Signaling Exclusively but Cooperatively Maintain Fetal Myogenic Progenitors. Stem Cells 2022; 40:1031-1042. [PMID: 35922037 DOI: 10.1093/stmcls/sxac056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 07/27/2022] [Indexed: 11/14/2022]
Abstract
Myogenic progenitors (MPs) generate myocytes that fuse to form myofibers during skeletal muscle development while maintaining the progenitor pool, which is crucial for generating sufficient muscle. Notch signaling has been known to reserve a population of embryonic MPs during primary myogenesis by promoting cell cycle exit and suppressing premature differentiation. However, the roles of individual Notch receptors (Notch1-4) during embryonic/fetal myogenesis are still elusive. In this study, we found that Notch1 and Notch2, which exhibit the highest structural similarity among Notch receptors, maintain the MP population by distinct mechanisms: Notch1 induces cell cycle exit and Notch2 suppresses premature differentiation. Moreover, genetic and cell culture studies showed that Notch1 and Notch2 signaling in MPs are distinctively activated by interacting with Notch ligand-expressing myofibers and MP-lineage cells, respectively. These results suggest that through different activation modes, Notch1 and Notch2 distinctively and cooperatively maintain MP population during fetal myogenesis for proper muscle development.
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Affiliation(s)
- Young-Woo Jo
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Inkuk Park
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Kyusang Yoo
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Hyun-Young Woo
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Ye Lynne Kim
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Yea-Eun Kim
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
| | - Ji-Hoon Kim
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea.,Molecular Recognition Research Center, Korea Institute of Science and Technology, Seoul, Republic of Korea
| | - Young-Yun Kong
- School of Biological Sciences, Seoul National University, Seoul, Republic of Korea
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12
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Li R, Meng S, Ji M, Rong X, You Z, Cai C, Guo X, Lu C, Liang G, Cao G, Li B, Yang Y. HMG20A Inhibit Adipogenesis by Transcriptional and Epigenetic Regulation of MEF2C Expression. Int J Mol Sci 2022; 23:ijms231810559. [PMID: 36142473 PMCID: PMC9505946 DOI: 10.3390/ijms231810559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/29/2022] [Accepted: 09/04/2022] [Indexed: 11/24/2022] Open
Abstract
Obesity and its associated metabolic disease do serious harm to human health. The transcriptional cascade network with transcription factors as the core is the focus of current research on adipogenesis and its mechanism. Previous studies have found that HMG domain protein 20A (HMG20A) is highly expressed in the early stage of adipogenic differentiation of porcine intramuscular fat (IMF), which may be involved in regulating adipogenesis. In this study, HMG20A was found to play a key negative regulatory role in adipogenesis. Gain- and loss-of-function studies revealed that HMG20A inhibited the differentiation of SVF cells and C3H10T1/2 cells into mature adipocytes. RNA-seq was used to screen differentially expressed genes after HMG20A knockdown. qRT-PCR and ChIP-PCR confirmed that MEF2C was the real target of HMG20A, and HMG20A played a negative regulatory role through MEF2C. HMG20A binding protein LSD1 was found to alleviate the inhibitory effect of HMG20A on adipogenesis. Further studies showed that HMG20A could cooperate with LSD1 to increase the H3K4me2 of the MEF2C promoter and then increase the expression of MEF2C. Collectively, these findings highlight a role for HMG20A-dependent transcriptional and epigenetic regulation in adipogenesis.
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13
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Vicente-García C, Hernández-Camacho JD, Carvajal JJ. Regulation of myogenic gene expression. Exp Cell Res 2022; 419:113299. [DOI: 10.1016/j.yexcr.2022.113299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 07/19/2022] [Accepted: 07/25/2022] [Indexed: 12/22/2022]
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14
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Jing Z, Okubo H, Morishige JI, Xu P, Hasan N, Nagata N, Ando H. Lenvatinib causes reduced expression of carnitine/organic cation transporter 2 and carnitine deficiency in the skeletal muscle of rats. Toxicol Lett 2022; 366:17-25. [PMID: 35788046 DOI: 10.1016/j.toxlet.2022.06.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2022] [Revised: 06/21/2022] [Accepted: 06/30/2022] [Indexed: 12/29/2022]
Abstract
Lenvatinib, an oral tyrosine kinase inhibitor, is widely used to treat several types of advanced cancers but often causes muscular adverse reactions. Although carnitine supplementation may prevent these effects, the mechanism underlying lenvatinib-induced skeletal muscle impairment remains poorly understood. To this end, we aimed to investigate the impact of lenvatinib on carnitine disposition in rats. Once-daily administration of lenvatinib repeated for two weeks did not affect urinary excretion or serum concentration of carnitines throughout the treatment period but ultimately decreased the L-carnitine content in the skeletal muscle. The treatment decreased the expression of carnitine/organic cation transporter (OCTN) 2, a key transporter of carnitine, in skeletal muscle at the protein level but not at the mRNA level. In cultured C2C12 myocytes, lenvatinib inhibited OCTN2 expression in a dose-dependent manner at the protein level. Furthermore, lenvatinib dose-dependently decreased the protein levels of carnitine-related genes, adenosine triphosphate content, mitochondrial membrane potential, and markers of mitochondrial function in vitro. These results reveal the deleterious effects of lenvatinib on OCTN2 expression, carnitine content, and mitochondrial function in skeletal muscle that may be associated with muscle toxicity.
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Affiliation(s)
- Zheng Jing
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Hironao Okubo
- Department of Gastroenterology, Juntendo University Nerima Hospital, Tokyo, Japan
| | - Jun-Ichi Morishige
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Pingping Xu
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Nazmul Hasan
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Naoto Nagata
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Hitoshi Ando
- Department of Cellular and Molecular Function Analysis, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan.
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15
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Jain A, McCoy M, Coats C, Brown SZ, Addya S, Pelz C, Sears RC, Yeo CJ, Brody JR. HuR Plays a Role in Double-Strand Break Repair in Pancreatic Cancer Cells and Regulates Functional BRCA1-Associated-Ring-Domain-1(BARD1) Isoforms. Cancers (Basel) 2022; 14:cancers14071848. [PMID: 35406624 PMCID: PMC8997573 DOI: 10.3390/cancers14071848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 03/07/2022] [Accepted: 04/02/2022] [Indexed: 02/06/2023] Open
Abstract
Human Antigen R (HuR/ELAVL1) is known to regulate stability of mRNAs involved in pancreatic ductal adenocarcinoma (PDAC) cell survival. Although several HuR targets are established, it is likely that many remain currently unknown. Here, we identified BARD1 mRNA as a novel target of HuR. Silencing HuR caused a >70% decrease in homologous recombination repair (HRR) efficiency as measured by the double-strand break repair (pDR-GFP reporter) assay. HuR-bound mRNAs extracted from RNP-immunoprecipitation and probed on a microarray, revealed a subset of HRR genes as putative HuR targets, including the BRCA1-Associated-Ring-Domain-1 (BARD1) (p < 0.005). BARD1 genetic alterations are infrequent in PDAC, and its context-dependent upregulation is poorly understood. Genetic silencing (siRNA and CRISPR knock-out) and pharmacological targeting of HuR inhibited both full length (FL) BARD1 and its functional isoforms (α, δ, Φ). Silencing BARD1 sensitized cells to olaparib and oxaliplatin; caused G2-M cell cycle arrest; and increased DNA-damage while decreasing HRR efficiency in cells. Exogenous overexpression of BARD1 in HuR-deficient cells partially rescued the HRR dysfunction, independent of an HuR pro-oncogenic function. Collectively, our findings demonstrate for the first time that BARD1 is a bona fide HuR target, which serves as an important regulatory point of the transient DNA-repair response in PDAC cells.
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Affiliation(s)
- Aditi Jain
- The Jefferson Pancreas, Biliary and Related Cancer Center, Department of Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA; (C.C.); (S.Z.B.); (C.J.Y.)
- Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA;
- Correspondence: (A.J.); (J.R.B.); Tel.: +1-215-955-2693 (A.J.); +1-443-812-1852 (J.R.B.)
| | - Matthew McCoy
- Department of Oncology, Innovation Center for Biomedical Informatics, Georgetown University Medical Center, Washington, DC 20007, USA;
| | - Carolyn Coats
- The Jefferson Pancreas, Biliary and Related Cancer Center, Department of Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA; (C.C.); (S.Z.B.); (C.J.Y.)
| | - Samantha Z. Brown
- The Jefferson Pancreas, Biliary and Related Cancer Center, Department of Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA; (C.C.); (S.Z.B.); (C.J.Y.)
- The Department of Surgery, Brenden-Colson Center for Pancreatic Care, The Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97201, USA
| | - Sankar Addya
- Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA;
| | - Carl Pelz
- The Department of Molecular and Medical Genetics, Brenden-Colson Center for Pancreatic Care, The Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97201, USA; (C.P.); (R.C.S.)
| | - Rosalie C. Sears
- The Department of Molecular and Medical Genetics, Brenden-Colson Center for Pancreatic Care, The Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97201, USA; (C.P.); (R.C.S.)
| | - Charles J. Yeo
- The Jefferson Pancreas, Biliary and Related Cancer Center, Department of Surgery, Thomas Jefferson University, Philadelphia, PA 19107, USA; (C.C.); (S.Z.B.); (C.J.Y.)
- Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA;
| | - Jonathan R. Brody
- The Department of Surgery, Brenden-Colson Center for Pancreatic Care, The Knight Cancer Institute, Oregon Health & Science University, Portland, OR 97201, USA
- Correspondence: (A.J.); (J.R.B.); Tel.: +1-215-955-2693 (A.J.); +1-443-812-1852 (J.R.B.)
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16
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Gargani S, Lourou N, Arapatzi C, Tzanos D, Saridaki M, Dushku E, Chatzimike M, Sidiropoulos ND, Andreadou M, Ntafis V, Hatzis P, Kostourou V, Kontoyiannis DL. Inactivation of AUF1 in Myeloid Cells Protects From Allergic Airway and Tumor Infiltration and Impairs the Adenosine-Induced Polarization of Pro-Angiogenic Macrophages. Front Immunol 2022; 13:752215. [PMID: 35222366 PMCID: PMC8873154 DOI: 10.3389/fimmu.2022.752215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 01/21/2022] [Indexed: 11/13/2022] Open
Abstract
The four isoforms of the RNA-binding protein hnRNPD/AUF1 have been proposed to limit the use of inflammatory mRNAs in innate immune cells. Mice engineered to lack AUF1s in all tissues are sensitive to acute inflammatory assaults; however, they also manifest complex degenerations obscuring assessment of AUF1s’ roles in innate immune cells. Here, we restricted a debilitating AUF1 mutation to the mouse myeloid lineage and performed disease-oriented phenotypic analyses to assess the requirement of AUF1s in variable contexts of innate immune reactivity. Contrary to the whole-body mutants, the myeloid mutants of AUF1s did not show differences in their susceptibility to cytokine storms occurring during endotoxemia; neither in type-I cell-mediated reactions driving intestinal inflammation by chemical irritants. Instead, they were resistant to allergic airway inflammation and displayed reductions in inflammatory infiltrates and an altered T-helper balance. The ex-vivo analysis of macrophages revealed that the loss of AUF1s had a minimal effect on their proinflammatory gene expression. Moreover, AUF1s were dispensable for the classical polarization of cultured macrophages by LPS & IFNγ correlating with the unchanged response of mutant mice to systemic and intestinal inflammation. Notably, AUF1s were also dispensable for the alternative polarization of macrophages by IL4, TGFβ and IL10, known to be engaged in allergic reactions. In contrast, they were required to switch proinflammatory macrophages towards a pro-angiogenic phenotype induced by adenosine receptor signals. Congruent to this, the myeloid mutants of AUF1 displayed lower levels of vascular remodeling factors in exudates from allergen exposed lungs; were unable to support the growth and inflammatory infiltration of transplanted melanoma tumors; and failed to vascularize inert grafts unless supplemented with angiogenic factors. Mechanistically, adenosine receptor signals enhanced the association of AUF1s with the Vegfa, Il12b, and Tnf mRNAs to differentially regulate and facilitate the pro-angiogenic switch. Our data collectively demonstrates that AUF1s do not act as general anti-inflammatory factors in innate immune cells but have more specialized roles in regulons allowing specific innate immune cell transitions to support tissue infiltration and remodeling processes.
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Affiliation(s)
- Sofia Gargani
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Niki Lourou
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Christina Arapatzi
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Dimitris Tzanos
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Marania Saridaki
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Esmeralda Dushku
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Margarita Chatzimike
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Nikolaos D. Sidiropoulos
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Margarita Andreadou
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Vasileios Ntafis
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Pantelis Hatzis
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Vassiliki Kostourou
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
| | - Dimitris L. Kontoyiannis
- Biomedical Sciences Research Centre “Alexander Fleming”, Institute of Fundamental Biomedical Research, Vari, Greece
- Department of Genetics, Development and Molecular Biology, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
- *Correspondence: Dimitris L. Kontoyiannis, ;
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17
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van Santen VJB, Klein-Nulend J, Bakker AD, Jaspers RT. Stiff matrices enhance myoblast proliferation, reduce differentiation, and alter the response to fluid shear stress in vitro. Cell Biochem Biophys 2022; 80:161-170. [DOI: 10.1007/s12013-021-01050-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2021] [Indexed: 11/03/2022]
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18
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Yu D, Li X, Wang Z, Jiang S, Yan T, Fang K, Shi Y, Jiang Z, Zhang S. Role of AUF1 in modulating the proliferation, migration and senescence of skin cells. Exp Ther Med 2021; 23:45. [PMID: 34934424 PMCID: PMC8652399 DOI: 10.3892/etm.2021.10967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/11/2021] [Indexed: 11/05/2022] Open
Abstract
AU-rich element RNA-binding factor 1 (AUF1) is a classical RNA-binding protein. AUF1 influences the process of development, apoptosis and tumorigenesis by interacting with adenylate-uridylate rich element-bearing mRNAs. Human skin is the largest organ of the body and acts as a protective barrier against pathogens and injuries. The aim of the present study was to explore the function and potential molecular pathways of AUF1 in human skin cells. AUF1 was overexpressed in human keratinocyte HaCaT cells and human skin fibroblast WS1 cells using adenoviruses and silenced using lentiviruses. AUF1 overexpression facilitated cell proliferation, whereas AUF1 knockdown induced the opposite effect. AUF1 reduced apoptosis but did not affect cell cycle progression. Forced AUF1 expression promoted the migration of human skin cells, as demonstrated by a scratch wound healing assay. Cell senescence was alleviated in AUF1-overexpressing skin cells, while AUF1 knockdown increased cell senescence. WS1 cells with AUF1 overexpression and silencing were used for RNA-sequencing and Kyoto Encyclopedia of Genes and Genomes-based pathway analysis to identify AUF1-affected mRNAs. A total of 18 mRNAs (eight mRNAs with positive associations and 10 mRNAs with negative associations) revealed consistent associations with both AUF1 overexpression and silencing. Enriched pathways associated with AUF1 expression included 'MAPK', 'cell adhesion molecules', 'proteasome', 'cellular senescence' and 'TGF-β signaling', indicating a complex regulatory network. Overall, the results of the present study revealed that AUF1 is involved in the proliferation, migration and senescence of skin cells in vitro and may be a potential target for cosmetic and disease treatment of skin.
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Affiliation(s)
- Daojiang Yu
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China.,Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China
| | - Xiaoqian Li
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Zhenyu Wang
- School of Radiation Medicine and Protection, Soochow University, Suzhou, Jiangsu 215123, P.R. China
| | - Sheng Jiang
- Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China
| | - Tao Yan
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Kai Fang
- Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China
| | - Yuhong Shi
- Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China
| | - Zhiqiang Jiang
- Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China
| | - Shuyu Zhang
- West China School of Basic Medical Sciences and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China.,Department of Surgery, Second Affiliated Hospital of Chengdu Medical College, China National Nuclear Corporation 416 Hospital, Chengdu, Sichuan 610051, P.R. China.,Department of Oncology, The Affiliated Changzhou No. 2 People's Hospital of Nanjing Medical University, Changzhou, Jiangsu 213100, P.R. China
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19
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Shi DL, Grifone R. RNA-Binding Proteins in the Post-transcriptional Control of Skeletal Muscle Development, Regeneration and Disease. Front Cell Dev Biol 2021; 9:738978. [PMID: 34616743 PMCID: PMC8488162 DOI: 10.3389/fcell.2021.738978] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/31/2021] [Indexed: 12/21/2022] Open
Abstract
Embryonic myogenesis is a temporally and spatially regulated process that generates skeletal muscle of the trunk and limbs. During this process, mononucleated myoblasts derived from myogenic progenitor cells within the somites undergo proliferation, migration and differentiation to elongate and fuse into multinucleated functional myofibers. Skeletal muscle is the most abundant tissue of the body and has the remarkable ability to self-repair by re-activating the myogenic program in muscle stem cells, known as satellite cells. Post-transcriptional regulation of gene expression mediated by RNA-binding proteins is critically required for muscle development during embryogenesis and for muscle homeostasis in the adult. Differential subcellular localization and activity of RNA-binding proteins orchestrates target gene expression at multiple levels to regulate different steps of myogenesis. Dysfunctions of these post-transcriptional regulators impair muscle development and homeostasis, but also cause defects in motor neurons or the neuromuscular junction, resulting in muscle degeneration and neuromuscular disease. Many RNA-binding proteins, such as members of the muscle blind-like (MBNL) and CUG-BP and ETR-3-like factors (CELF) families, display both overlapping and distinct targets in muscle cells. Thus they function either cooperatively or antagonistically to coordinate myoblast proliferation and differentiation. Evidence is accumulating that the dynamic interplay of their regulatory activity may control the progression of myogenic program as well as stem cell quiescence and activation. Moreover, the role of RNA-binding proteins that regulate post-transcriptional modification in the myogenic program is far less understood as compared with transcription factors involved in myogenic specification and differentiation. Here we review past achievements and recent advances in understanding the functions of RNA-binding proteins during skeletal muscle development, regeneration and disease, with the aim to identify the fundamental questions that are still open for further investigations.
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Affiliation(s)
- De-Li Shi
- Affiliated Hospital of Guangdong Medical University, Zhanjiang, China.,Developmental Biology Laboratory, CNRS-UMR 7622, Institut de Biologie de Paris-Seine, Sorbonne University, Paris, France
| | - Raphaëlle Grifone
- Developmental Biology Laboratory, CNRS-UMR 7622, Institut de Biologie de Paris-Seine, Sorbonne University, Paris, France
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20
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Abbadi D, Andrews JJ, Katsara O, Schneider RJ. AUF1 gene transfer increases exercise performance and improves skeletal muscle deficit in adult mice. Mol Ther Methods Clin Dev 2021; 22:222-236. [PMID: 34485607 PMCID: PMC8399044 DOI: 10.1016/j.omtm.2021.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 07/09/2021] [Indexed: 11/29/2022]
Abstract
Muscle function and mass begin declining in adults long before evidence of sarcopenia and include reduced mitochondrial function, although much remains to be characterized. We found that mRNA decay factor AU-rich mRNA binding factor 1 (AUF1), which stimulates myogenesis, is strongly reduced in skeletal muscle of adult and older mice in the absence of evidence of sarcopenia. Muscle-specific adeno-associated virus (AAV)8-AUF1 gene therapy increased expression of AUF1, muscle function, and mass. AAV8 AUF1 muscle gene transfer in 12-month-old mice increased the levels of activated muscle stem (satellite) cells, increased muscle mass, reduced markers of muscle atrophy, increased markers of mitochondrial content and muscle fiber oxidative capacity, and enhanced exercise performance to levels of 3-month-old mice. With wild-type and AUF1 knockout mice and cultured myoblasts, AUF1 supplementation of muscle fibers was found to increase expression of Peroxisome Proliferator-activated Receptor Gamma Co-activator 1-alpha (PGC1α), a major effector of skeletal muscle mitochondrial oxidative metabolism. AUF1 stabilized and increased translation of the pgc1α mRNA, which is strongly reduced in adult muscle in the absence of AUF1 supplementation. Skeletal muscle-specific gene transfer of AUF1 therefore restores muscle mass, increases exercise endurance, and may provide a therapeutic strategy for age-related muscle loss.
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Affiliation(s)
- Dounia Abbadi
- Department of Microbiology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA
| | - John J. Andrews
- Department of Microbiology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA
| | - Olga Katsara
- Department of Microbiology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA
| | - Robert J. Schneider
- Department of Microbiology, New York University School of Medicine, 550 First Avenue, New York, NY 10016, USA
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21
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Shen X, Liu Z, Wang C, Xu F, Zhang J, Li M, Lei Y, Wang A, Bi C, Zhu G. Inhibition of Postn Rescues Myogenesis Defects in Myotonic Dystrophy Type 1 Myoblast Model. Front Cell Dev Biol 2021; 9:710112. [PMID: 34490258 PMCID: PMC8417118 DOI: 10.3389/fcell.2021.710112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Accepted: 07/30/2021] [Indexed: 12/27/2022] Open
Abstract
Myotonic dystrophy type 1 (DM1) is an inherited neuromuscular disease caused by expanded CTG repeats in the 3' untranslated region (3'UTR) of the DMPK gene. The myogenesis process is defective in DM1, which is closely associated with progressive muscle weakness and wasting. Despite many proposed explanations for the myogenesis defects in DM1, the underlying mechanism and the involvement of the extracellular microenvironment remained unknown. Here, we constructed a DM1 myoblast cell model and reproduced the myogenesis defects. By RNA sequencing (RNA-seq), we discovered that periostin (Postn) was the most significantly upregulated gene in DM1 myogenesis compared with normal controls. This difference in Postn was confirmed by real-time quantitative PCR (RT-qPCR) and western blotting. Moreover, Postn was found to be significantly upregulated in skeletal muscle and myoblasts of DM1 patients. Next, we knocked down Postn using a short hairpin RNA (shRNA) in DM1 myoblast cells and found that the myogenesis defects in the DM1 group were successfully rescued, as evidenced by increases in the myotube area, the fusion index, and the expression of myogenesis regulatory genes. Similarly, Postn knockdown in normal myoblast cells enhanced myogenesis. As POSTN is a secreted protein, we treated the DM1 myoblast cells with a POSTN-neutralizing antibody and found that DM1 myogenesis defects were successfully rescued by POSTN neutralization. We also tested the myogenic ability of myoblasts in the skeletal muscle injury mouse model and found that Postn knockdown improved the myogenic ability of DM1 myoblasts. The activity of the TGF-β/Smad3 pathway was upregulated during DM1 myogenesis but repressed when inhibiting Postn with a Postn shRNA or a POSTN-neutralizing antibody, which suggested that the TGF-β/Smad3 pathway might mediate the function of Postn in DM1 myogenesis. These results suggest that Postn is a potential therapeutical target for the treatment of myogenesis defects in DM1.
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Affiliation(s)
- Xiaopeng Shen
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Zhongxian Liu
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Chunguang Wang
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Feng Xu
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Jingyi Zhang
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Meng Li
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Yang Lei
- Wuhu Center for Disease Control and Prevention, Wuhu, China
| | - Ao Wang
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Chao Bi
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
| | - Guoping Zhu
- Anhui Provincial Key Laboratory of Molecular Enzymology and Mechanism of Major Diseases, College of Life Sciences, Anhui Normal University, Wuhu, China.,Anhui Provincial Key Laboratory of the Conservation and Exploitation of Biological Resources, College of Life Sciences, Anhui Normal University, Wuhu, China.,Key Laboratory of Biomedicine in Gene Diseases and Health of Anhui Higher Education Institutes, College of Life Sciences, Anhui Normal University, Wuhu, China
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22
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Tsitsipatis D, Grammatikakis I, Driscoll RK, Yang X, Abdelmohsen K, Harris SC, Yang JH, Herman AB, Chang MW, Munk R, Martindale JL, Mazan-Mamczarz K, De S, Lal A, Gorospe M. AUF1 ligand circPCNX reduces cell proliferation by competing with p21 mRNA to increase p21 production. Nucleic Acids Res 2021; 49:1631-1646. [PMID: 33444453 PMCID: PMC7897478 DOI: 10.1093/nar/gkaa1246] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 11/28/2020] [Accepted: 12/11/2020] [Indexed: 01/06/2023] Open
Abstract
Mammalian circRNAs can influence different cellular processes by interacting with proteins and other nucleic acids. Here, we used ribonucleoprotein immunoprecipitation (RIP) analysis to identify systematically the circRNAs associated with the cancer-related protein AUF1. Among the circRNAs interacting with AUF1 in HeLa (human cervical carcinoma) cells, we focused on hsa_circ_0032434 (circPCNX), an abundant target of AUF1. Overexpression of circPCNX specifically interfered with the binding of AUF1 to p21 (CDKN1A) mRNA, thereby promoting p21 mRNA stability and elevating the production of p21, a major inhibitor of cell proliferation. Conversely, silencing circPCNX increased AUF1 binding to p21 mRNA, reducing p21 production and promoting cell division. Importantly, eliminating the AUF1-binding region of circPCNX abrogated the rise in p21 levels and rescued proliferation. Therefore, we propose that the interaction of circPCNX with AUF1 selectively prevents AUF1 binding to p21 mRNA, leading to enhanced p21 mRNA stability and p21 protein production, thereby suppressing cell growth.
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Affiliation(s)
- Dimitrios Tsitsipatis
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Ioannis Grammatikakis
- Regulatory RNAs and Cancer Section, Genetics Branch, Center for Cancer Research, National Cancer Institute IRP, NIH, Bethesda, MD, USA
| | - Riley K Driscoll
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Xiaoling Yang
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Sophia C Harris
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Jen-Hao Yang
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Allison B Herman
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Ming-Wen Chang
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Rachel Munk
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Krystyna Mazan-Mamczarz
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Supriyo De
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
| | - Ashish Lal
- Regulatory RNAs and Cancer Section, Genetics Branch, Center for Cancer Research, National Cancer Institute IRP, NIH, Bethesda, MD, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging (NIA) Intramural Research Program (IRP), National Institutes of Health (NIH), Baltimore, MD, USA
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23
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Das A, Das A, Das D, Abdelmohsen K, Panda AC. Circular RNAs in myogenesis. BIOCHIMICA ET BIOPHYSICA ACTA. GENE REGULATORY MECHANISMS 2020; 1863:194372. [PMID: 30946990 PMCID: PMC6773529 DOI: 10.1016/j.bbagrm.2019.02.011] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/09/2019] [Accepted: 02/21/2019] [Indexed: 01/08/2023]
Abstract
Skeletal muscles have an immense ability to regenerate from the muscle stem cells called satellite cells. The process of skeletal muscle regeneration is called myogenesis, which starts with activation of quiescent satellite cells immediately after muscle injury followed by proliferation and fusion of myoblasts into myotubes. Myogenesis is orchestrated through the expression of a specific set of genes which, at each step regulated by complex gene regulatory networks. Besides the well-established roles of transcription factors, increasing evidence demonstrated that circular (circ)RNAs modulate gene expression during myogenesis and are involved in muscle-related diseases. Here we review the recent findings of circRNAs involved in myogenesis.
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Affiliation(s)
- Arundhati Das
- Institute of Life Sciences, Nalco Square, Bhubaneswar, Odisha, India; School of Biotechnology, KIIT University, Bhubaneswar, India
| | - Aniruddha Das
- Institute of Life Sciences, Nalco Square, Bhubaneswar, Odisha, India; School of Biotechnology, KIIT University, Bhubaneswar, India
| | - Debojyoti Das
- Institute of Life Sciences, Nalco Square, Bhubaneswar, Odisha, India; School of Biotechnology, KIIT University, Bhubaneswar, India
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, USA
| | - Amaresh C Panda
- Institute of Life Sciences, Nalco Square, Bhubaneswar, Odisha, India.
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24
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Poganik JR, Long MJC, Disare MT, Liu X, Chang SH, Hla T, Aye Y. Post-transcriptional regulation of Nrf2-mRNA by the mRNA-binding proteins HuR and AUF1. FASEB J 2019; 33:14636-14652. [PMID: 31665914 DOI: 10.1096/fj.201901930r] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The nuclear factor erythroid 2-related factor 2 (Nrf2) signaling axis is a target of covalent drugs and bioactive native electrophiles. However, much of our understanding of Nrf2 regulation has been focused at the protein level. Here we report a post-transcriptional modality to directly regulate Nrf2-mRNA. Our initial studies focused on the effects of the key mRNA-binding protein (mRBP) HuR on global transcriptomic changes incurred upon oxidant or electrophile stimulation. These RNA-sequencing data and subsequent mechanistic analyses led us to discover a novel role of HuR in regulating Nrf2 activity, and in the process, we further identified the related mRBP AUF1 as an additional novel Nrf2 regulator. Both mRBPs regulate Nrf2 activity by direct interaction with the Nrf2 transcript. Our data showed that HuR enhances Nrf2-mRNA maturation and promotes its nuclear export, whereas AUF1 stabilizes Nrf2-mRNA. Both mRBPs target the 3'-UTR of Nrf2-mRNA. Using a Nrf2 activity-reporter zebrafish strain, we document that this post-transcriptional control of Nrf2 activity is conserved at the whole-vertebrate level.-Poganik, J. R., Long, M. J. C., Disare, M. T., Liu, X., Chang, S.-H., Hla, T., Aye, Y. Post-transcriptional regulation of Nrf2-mRNA by the mRNA-binding proteins HuR and AUF1.
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Affiliation(s)
- Jesse R Poganik
- Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland.,Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York, USA
| | - Marcus J C Long
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York, USA
| | - Michael T Disare
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York, USA
| | - Xuyu Liu
- Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland
| | - Sung-Hee Chang
- Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| | - Timothy Hla
- Department of Surgery, Harvard Medical School, Boston, Massachusetts, USA; and.,Vascular Biology Program, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Yimon Aye
- Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland
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25
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Noh JH, Kim KM, Idda ML, Martindale JL, Yang X, Abdelmohsen K, Gorospe M. GRSF1 suppresses cell senescence. Aging (Albany NY) 2019; 10:1856-1866. [PMID: 30086537 PMCID: PMC6128438 DOI: 10.18632/aging.101516] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 08/02/2018] [Indexed: 12/25/2022]
Abstract
A prominent phenotype triggered by the loss of mitochondrial homeostasis is cellular senescence, characterized by cessation of growth and a senescence-associated secretory phenotype (SASP). We identified the G-rich RNA sequence-binding factor 1 (GRSF1) as a major mitochondrial protein implicated in this response. GRSF1 levels declined in senescent cells through reduced protein stability, and lowering GRSF1 abundance caused mitochondrial stress leading to elevated production of superoxide, increased DNA damage foci, and diminished cell proliferation. In addition, reducing GRSF1 increased the activity of a senescence-associated β-galactosidase (SA-β-gal) and the production and secretion of the SASP factor interleukin 6 (IL6). Together, our findings indicate that the decline in GRSF1 levels during cellular senescence contributes to impairing mitochondrial function, elevating ROS and DNA damage, suppressing growth, and implementing a pro-inflammatory program.
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Affiliation(s)
- Ji Heon Noh
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Kyoung Mi Kim
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - M Laura Idda
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Xiaoling Yang
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging Intramural Research Program, National Institutes of Health, Baltimore, MD 21224, USA
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26
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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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27
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Zheng Z, Li C, Ha P, Chang GX, Yang P, Zhang X, Kim JK, Jiang W, Pang X, Berthiaume EA, Mills Z, Haveles CS, Chen E, Ting K, Soo C. CDKN2B upregulation prevents teratoma formation in multipotent fibromodulin-reprogrammed cells. J Clin Invest 2019; 129:3236-3251. [PMID: 31305260 PMCID: PMC6668700 DOI: 10.1172/jci125015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 05/21/2019] [Indexed: 12/11/2022] Open
Abstract
Tumorigenicity is a well-documented risk to overcome for pluripotent or multipotent cell applications in regenerative medicine. To address the emerging demand for safe cell sources in tissue regeneration, we established a novel, protein-based reprogramming method that does not require genome integration or oncogene activation to yield multipotent fibromodulin (FMOD)-reprogrammed (FReP) cells from dermal fibroblasts. When compared with induced pluripotent stem cells (iPSCs), FReP cells exhibited a superior capability for bone and skeletal muscle regeneration with markedly less tumorigenic risk. Moreover, we showed that the decreased tumorigenicity of FReP cells was directly related to an upregulation of cyclin-dependent kinase inhibitor 2B (CDKN2B) expression during the FMOD reprogramming process. Indeed, sustained suppression of CDKN2B resulted in tumorigenic, pluripotent FReP cells that formed teratomas in vivo that were indistinguishable from iPSC-derived teratomas. These results highlight the pivotal role of CDKN2B in cell fate determination and tumorigenic regulation and reveal an alternative pluripotent/multipotent cell reprogramming strategy that solely uses FMOD protein.
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Affiliation(s)
- Zhong Zheng
- Division of Growth and Development, School of Dentistry, and
| | - Chenshuang Li
- Division of Growth and Development, School of Dentistry, and
| | - Pin Ha
- Division of Growth and Development, School of Dentistry, and
| | - Grace X. Chang
- David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | - Pu Yang
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Xinli Zhang
- Division of Growth and Development, School of Dentistry, and
| | - Jong Kil Kim
- Division of Growth and Development, School of Dentistry, and
| | - Wenlu Jiang
- Division of Growth and Development, School of Dentistry, and
- State Key Laboratory of Oral Diseases, Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, China
| | - Xiaoxiao Pang
- Division of Growth and Development, School of Dentistry, and
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Stomatology Hospital of Chongqing Medical University, Chongqing, China
| | | | - Zane Mills
- Department of Ecology and Evolutionary Biology, and
| | | | - Eric Chen
- Division of Growth and Development, School of Dentistry, and
| | - Kang Ting
- Division of Growth and Development, School of Dentistry, and
- Division of Plastic and Reconstructive Surgery and Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, UCLA, Los Angeles, California, USA
| | - Chia Soo
- Division of Plastic and Reconstructive Surgery and Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center, UCLA, Los Angeles, California, USA
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28
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Muscle development and regeneration controlled by AUF1-mediated stage-specific degradation of fate-determining checkpoint mRNAs. Proc Natl Acad Sci U S A 2019; 116:11285-11290. [PMID: 31113881 DOI: 10.1073/pnas.1901165116] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
AUF1 promotes rapid decay of mRNAs containing 3' untranslated region (3'UTR) AU-rich elements (AREs). AUF1 depletion in mice accelerates muscle loss and causes limb girdle muscular dystrophy. Here, we demonstrate that the selective, targeted degradation by AUF1 of key muscle stem cell fate-determining checkpoint mRNAs regulates each stage of muscle development and regeneration by reprogramming each myogenic stage. Skeletal muscle stem (satellite) cell explants show that Auf1 transcription is activated with satellite cell activation by stem cell regulatory factor CTCF. AUF1 then targets checkpoint ARE-mRNAs for degradation, progressively reprogramming the transcriptome through each stage of myogenesis. Transition steps in myogenesis, from stem cell proliferation to differentiation to muscle fiber development, are each controlled by fate-determining checkpoint mRNAs, which, surprisingly, were found to be controlled in their expression by AUF1-targeted mRNA decay. Checkpoint mRNAs targeted by AUF1 include Twist1, decay of which promotes myoblast development; CyclinD1, decay of which blocks myoblast proliferation and initiates differentiation; and RGS5, decay of which activates Sonic Hedgehog (SHH) pathway-mediated differentiation of mature myotubes. AUF1 therefore orchestrates muscle stem cell proliferation, self-renewal, myoblast differentiation, and ultimately formation of muscle fibers through targeted, staged mRNA decay.
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29
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Munk R, Martindale JL, Yang X, Yang JH, Grammatikakis I, Di Germanio C, Mitchell SJ, de Cabo R, Lehrmann E, Zhang Y, Becker KG, Raz V, Gorospe M, Abdelmohsen K, Panda AC. Loss of miR-451a enhances SPARC production during myogenesis. PLoS One 2019; 14:e0214301. [PMID: 30925184 PMCID: PMC6440632 DOI: 10.1371/journal.pone.0214301] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 03/10/2019] [Indexed: 12/17/2022] Open
Abstract
MicroRNAs (miRNAs) are small noncoding RNAs that critically regulate gene expression. Their abundance and function have been linked to a range of physiologic and pathologic processes. In aged monkey muscle, miR-451a and miR-144-3p were far more abundant than in young monkey muscle. This observation led us to hypothesize that miR-451a and miR-144-3p may influence muscle homeostasis. To test if these conserved microRNAs were implicated in myogenesis, we investigated their function in the mouse myoblast line C2C12. The levels of both microRNAs declined with myogenesis; however, only overexpression of miR-451a, but not miR-144-3p, robustly impeded C2C12 differentiation, suggesting an inhibitory role for miR-451a in myogenesis. Further investigation of the regulatory influence of miR-451a identified as one of the major targets Sparc mRNA, which encodes a secreted protein acidic and rich in cysteine (SPARC) that functions in wound healing and cellular differentiation. In mouse myoblasts, miR-451a suppressed Sparc mRNA translation. Together, our findings indicate that miR-451a is downregulated in differentiated myoblasts and suggest that it decreases C2C12 differentiation at least in part by suppressing SPARC biosynthesis.
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Affiliation(s)
- Rachel Munk
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Xiaoling Yang
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Jen-Hao Yang
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Ioannis Grammatikakis
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Clara Di Germanio
- Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Sarah J Mitchell
- Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Rafael de Cabo
- Translational Gerontology Branch, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Elin Lehrmann
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Yongqing Zhang
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Kevin G Becker
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Vered Raz
- Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Kotb Abdelmohsen
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Amaresh C Panda
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Baltimore, Maryland, United States of America
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30
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Nikonova E, Kao SY, Ravichandran K, Wittner A, Spletter ML. Conserved functions of RNA-binding proteins in muscle. Int J Biochem Cell Biol 2019; 110:29-49. [PMID: 30818081 DOI: 10.1016/j.biocel.2019.02.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 02/21/2019] [Accepted: 02/23/2019] [Indexed: 12/13/2022]
Abstract
Animals require different types of muscle for survival, for example for circulation, motility, reproduction and digestion. Much emphasis in the muscle field has been placed on understanding how transcriptional regulation generates diverse types of muscle during development. Recent work indicates that alternative splicing and RNA regulation are as critical to muscle development, and altered function of RNA-binding proteins causes muscle disease. Although hundreds of genes predicted to bind RNA are expressed in muscles, many fewer have been functionally characterized. We present a cross-species view summarizing what is known about RNA-binding protein function in muscle, from worms and flies to zebrafish, mice and humans. In particular, we focus on alternative splicing regulated by the CELF, MBNL and RBFOX families of proteins. We discuss the systemic nature of diseases associated with loss of RNA-binding proteins in muscle, focusing on mis-regulation of CELF and MBNL in myotonic dystrophy. These examples illustrate the conservation of RNA-binding protein function and the marked utility of genetic model systems in understanding mechanisms of RNA regulation.
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Affiliation(s)
- Elena Nikonova
- Biomedical Center, Department of Physiological Chemistry, Ludwig-Maximilians-University München, Großhaderner Str. 9, 82152, Martinsried-Planegg, Germany
| | - Shao-Yen Kao
- Biomedical Center, Department of Physiological Chemistry, Ludwig-Maximilians-University München, Großhaderner Str. 9, 82152, Martinsried-Planegg, Germany
| | - Keshika Ravichandran
- Biomedical Center, Department of Physiological Chemistry, Ludwig-Maximilians-University München, Großhaderner Str. 9, 82152, Martinsried-Planegg, Germany
| | - Anja Wittner
- Biomedical Center, Department of Physiological Chemistry, Ludwig-Maximilians-University München, Großhaderner Str. 9, 82152, Martinsried-Planegg, Germany
| | - Maria L Spletter
- Biomedical Center, Department of Physiological Chemistry, Ludwig-Maximilians-University München, Großhaderner Str. 9, 82152, Martinsried-Planegg, Germany; Center for Integrated Protein Science Munich (CIPSM) at the Department of Chemistry, Ludwig-Maximilians-Universität München, Munich, Germany.
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31
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Lampasona AA, Czaplinski K. Hnrnpab regulates neural cell motility through transcription of Eps8. RNA (NEW YORK, N.Y.) 2019; 25:45-59. [PMID: 30314980 PMCID: PMC6298563 DOI: 10.1261/rna.067413.118] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 10/01/2018] [Indexed: 05/05/2023]
Abstract
Cell migration requires a complicated network of structural and regulatory proteins. Changes in cellular motility can impact migration as a result of cell-type or developmental stage regulated expression of critical motility genes. Hnrnpab is a conserved RNA-binding protein found as two isoforms produced by alternative splicing. Its expression is enriched in the subventricular zone (SVZ) and the rostral migratory stream within the brain, suggesting possible support of the migration of neural progenitor cells in this region. Here we show that the migration of cells from the SVZ of developing Hnrnpab-/- mouse brains is impaired. An RNA-seq analysis to identify Hnrnpab-dependent cell motility genes led us to Eps8, and in agreement with the change in cell motility, we show that Eps8 is decreased in Hnrnpab-/- SVZ tissue. We scrutinized the motility of Hnrnpab-/- cells and confirmed that the decreases in both cell motility and Eps8 are restored by ectopically coexpressing both alternatively spliced Hnrnpab isoforms, therefore these variants are surprisingly nonredundant for cell motility. Our results support a model where both Hnrnpab isoforms work in concert to regulate Eps8 transcription in the mouse SVZ to promote the normal migration of neural cells during CNS development.
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Affiliation(s)
- Alexa A Lampasona
- Program in Molecular and Cellular Pharmacology, Stony Brook University, Stony Brook, New York 11749, USA
- Centers for Molecular Medicine, Stony Brook University, Stony Brook, New York 11749, USA
| | - Kevin Czaplinski
- Centers for Molecular Medicine, Stony Brook University, Stony Brook, New York 11749, USA
- Department of Anesthesiology, Stony Brook University, Stony Brook, New York 11749, USA
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32
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Wang IX, Grunseich C, Fox J, Burdick J, Zhu Z, Ravazian N, Hafner M, Cheung VG. Human proteins that interact with RNA/DNA hybrids. Genome Res 2018; 28:1405-1414. [PMID: 30108179 PMCID: PMC6120628 DOI: 10.1101/gr.237362.118] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 07/27/2018] [Indexed: 12/16/2022]
Abstract
RNA/DNA hybrids form when RNA hybridizes with its template DNA generating a three-stranded structure known as the R-loop. Knowledge of how they form and resolve, as well as their functional roles, is limited. Here, by pull-down assays followed by mass spectrometry, we identified 803 proteins that bind to RNA/DNA hybrids. Because these proteins were identified using in vitro assays, we confirmed that they bind to R-loops in vivo. They include proteins that are involved in a variety of functions, including most steps of RNA processing. The proteins are enriched for K homology (KH) and helicase domains. Among them, more than 300 proteins preferred binding to hybrids than double-stranded DNA. These proteins serve as starting points for mechanistic studies to elucidate what RNA/DNA hybrids regulate and how they are regulated.
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Affiliation(s)
- Isabel X Wang
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Christopher Grunseich
- Neurogenetics Branch, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland 20892, USA
| | - Jennifer Fox
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Joshua Burdick
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Zhengwei Zhu
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA.,Department of Pediatrics, University of Michigan, Ann Arbor, Michigan 48109, USA
| | - Niema Ravazian
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA
| | - Markus Hafner
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases, Bethesda, Maryland 20892, USA
| | - Vivian G Cheung
- Howard Hughes Medical Institute, Chevy Chase, Maryland 20815, USA.,Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, USA.,Department of Pediatrics, University of Michigan, Ann Arbor, Michigan 48109, USA
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33
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Min KW, Jo MH, Shin S, Davila S, Zealy RW, Kang SI, Lloyd LT, Hohng S, Yoon JH. AUF1 facilitates microRNA-mediated gene silencing. Nucleic Acids Res 2017; 45:6064-6073. [PMID: 28334781 PMCID: PMC5449627 DOI: 10.1093/nar/gkx149] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 02/21/2017] [Indexed: 01/02/2023] Open
Abstract
Eukaryotic mRNA decay is tightly modulated by RNA-binding proteins (RBPs) and microRNAs (miRNAs). RBP AU-binding factor 1 (AUF1) has four isoforms resulting from alternative splicing and is critical for miRNA-mediated gene silencing with a distinct preference of target miRNAs. Previously, we have shown that AUF1 facilitates miRNA loading to Argonaute 2 (AGO2), the catalytic component of the RNA-induced silencing complex. Here, we further demonstrate that depletion of AUF1 abolishes the global interaction of miRNAs and AGO2. Single-molecule analysis revealed that AUF1 slowed down assembly of AGO2-let-7b-mRNA complex unexpectedly. However, target mRNAs recognized by both miRNA and AUF1 are less abundant upon AUF1 overexpression implying that AUF1 is a decay-promoting factor influencing multiple steps in AGO2-miRNA-mediated mRNA decay. Our findings indicate that AUF1 functions in promoting miRNA-mediated mRNA decay globally.
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Affiliation(s)
- Kyung-Won Min
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Myung Hyun Jo
- Department of Physics and Astronomy, Institute of Applied Physics, National Center for Creative Research Initiatives, Seoul National University, Seoul 151-747, Korea
| | - Soochul Shin
- Department of Physics and Astronomy, Institute of Applied Physics, National Center for Creative Research Initiatives, Seoul National University, Seoul 151-747, Korea
| | - Sylvia Davila
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Richard W Zealy
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Soo Im Kang
- Department of Plastic Surgery, Seoul National University Bundang Hospital, Seongnam 13605, Korea
| | - Lawson T Lloyd
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA
| | - Sungchul Hohng
- Department of Physics and Astronomy, Institute of Applied Physics, National Center for Creative Research Initiatives, Seoul National University, Seoul 151-747, Korea
| | - Je-Hyun Yoon
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC 29425, USA.,Laboratory of Genetics, National Institute on Aging-Intramural Research Program, NIH, Baltimore, MD 21224, USA
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34
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Panda AC, Martindale JL, Gorospe M. Polysome Fractionation to Analyze mRNA Distribution Profiles. Bio Protoc 2017; 7:e2126. [PMID: 28516123 DOI: 10.21769/bioprotoc.2126] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Eukaryotic cells adapt to changes in external or internal signals by precisely modulating the expression of specific gene products. The expression of protein-coding genes is controlled at the transcriptional and post-transcriptional levels. Among the latter steps, the regulation of translation is particularly important in cellular processes that require rapid changes in protein expression patterns. The translational efficiency of mRNAs is altered by RNA-binding proteins (RBPs) and noncoding (nc)RNAs such as microRNAs (Panda et al., 2014a and 2014b; Abdelmohsen et al., 2014). The impact of factors that regulate selective mRNA translation is a critical question in RNA biology. Polyribosome (polysome) fractionation analysis is a powerful method to assess the association of ribosomes with a given mRNA. It provides valuable information about the translational status of that mRNA, depending on the number of ribosomes with which they are associated, and identifies mRNAs that are not translated (Panda et al., 2016). mRNAs associated with many ribosomes form large polysomes that are predicted to be actively translated, while mRNAs associated with few or no ribosomes are expected to be translated poorly if at all. In sum, polysome fractionation analysis allows the direct determination of translation efficiencies at the level of the whole transcriptome as well as individual mRNAs.
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Affiliation(s)
- Amaresh C Panda
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
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35
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White EJF, Matsangos AE, Wilson GM. AUF1 regulation of coding and noncoding RNA. WILEY INTERDISCIPLINARY REVIEWS-RNA 2016; 8. [PMID: 27620010 DOI: 10.1002/wrna.1393] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/09/2016] [Accepted: 08/16/2016] [Indexed: 01/12/2023]
Abstract
AUF1 is a family of four RNA-binding proteins (RBPs) generated by alternative pre-messenger RNA (pre-mRNA) splicing, with canonical roles in controlling the stability and/or translation of mRNA targets based on recognition of AU-rich sequences within mRNA 3' untranslated regions. However, recent studies identifying AUF1 target sites across the transcriptome have revealed that these canonical functions are but a subset of its roles in posttranscriptional regulation of gene expression. In this review, we describe recent developments in our understanding of the RNA-binding properties of AUF1 together with their biochemical implications and roles in directing mRNA decay and translation. This is then followed by a survey of newly discovered activities for AUF1 proteins in control of miRNA synthesis and function, including miRNA assembly into microRNA (miRNA)-loaded RNA-induced silencing complexes (miRISCs), miRISC targeting to mRNA substrates, interplay with an expanding network of other cellular RBPs, and reciprocal regulatory relationships between miRNA and AUF1 synthesis. Finally, we discuss recently reported relationships between AUF1 and long noncoding RNAs and regulatory roles on viral RNA substrates. Cumulatively, these findings have significantly expanded our appreciation of the scope and diversity of AUF1 functions in the cell, and are prompting an exciting array of new questions moving forward. WIREs RNA 2017, 8:e1393. doi: 10.1002/wrna.1393 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Elizabeth J F White
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Aerielle E Matsangos
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Gerald M Wilson
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
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36
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The long noncoding RNA ASNR regulates degradation of Bcl-2 mRNA through its interaction with AUF1. Sci Rep 2016; 6:32189. [PMID: 27578251 PMCID: PMC5006016 DOI: 10.1038/srep32189] [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: 11/02/2015] [Accepted: 08/04/2016] [Indexed: 02/07/2023] Open
Abstract
The identification and characterization of long non-coding RNAs (lncRNAs) in diverse biological processes has recently developed rapidly. The large amounts of non-coding RNAs scale consistent with developmental complexity in eukaryotes, indicating that most of these transcripts may have functions in the regulation of biological processes and disorder in the organisms. In particular, Understanding of the overall biological significance of lncRNAs in cancers still remains limited. Here, we found a nuclear-retained lncRNA, termed Lnc_ASNR (apoptosis suppressing-noncoding RNA), which serves as a repressor of apoptosis. Lnc_ASNR was discovered in a set of microarray data derived from four kinds of tumor and adjacent normal tissue samples, and displayed significant up-regulation in the tumor tissues. Using an RNA-pull down assay, we found that Lnc_ASNR interacted with the protein ARE/poly (U)-binding/degradation factor 1(AUF1), which is reported to promote rapid degradation of the Bcl-2 mRNA, an inhibitor of apoptosis. Lnc_ASNR binds to AUFI in nucleus, decreasing the cytoplasmic proportion of AUF1 which targets the B-cell lymphoma-2 (Bcl-2) mRNA. Taken together, the overall effect of Lnc_ASNR expression is thus a decrease in cell apoptosis indicating that Lnc_ASNR may play a vital role in tumorigenesis and carcinogenesis.
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37
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Targeted mRNA Decay by RNA Binding Protein AUF1 Regulates Adult Muscle Stem Cell Fate, Promoting Skeletal Muscle Integrity. Cell Rep 2016; 16:1379-1390. [PMID: 27452471 DOI: 10.1016/j.celrep.2016.06.095] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 05/26/2016] [Accepted: 06/29/2016] [Indexed: 12/16/2022] Open
Abstract
Following skeletal muscle injury, muscle stem cells (satellite cells) are activated, proliferate, and differentiate to form myofibers. We show that mRNA-decay protein AUF1 regulates satellite cell function through targeted degradation of specific mRNAs containing 3' AU-rich elements (AREs). auf1(-/-) mice undergo accelerated skeletal muscle wasting with age and impaired skeletal muscle repair following injury. Satellite cell mRNA analysis and regeneration studies demonstrate that auf1(-/-) satellite cell self-renewal is impaired due to increased stability and overexpression of ARE-mRNAs, including cell-autonomous overexpression of matrix metalloprotease MMP9. Secreted MMP9 degrades the skeletal muscle matrix, preventing satellite-cell-mediated regeneration and return to quiescence. Blocking MMP9 activity in auf1(-/-) mice restores skeletal muscle repair and maintenance of the satellite cell population. Control of ARE-mRNA decay by AUF1 represents a mechanism for adult stem cell regulation and is implicated in human skeletal muscle wasting diseases.
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38
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Cao XK, Zhan ZY, Huang YZ, Lan XY, Lei CZ, Qi XL, Chen H. Variants and haplotypes within MEF2C gene influence stature of chinese native cattle including body dimensions and weight. Livest Sci 2016. [DOI: 10.1016/j.livsci.2016.01.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Panda AC, Abdelmohsen K, Martindale JL, Di Germanio C, Yang X, Grammatikakis I, Noh JH, Zhang Y, Lehrmann E, Dudekula DB, De S, Becker KG, White EJ, Wilson GM, de Cabo R, Gorospe M. Novel RNA-binding activity of MYF5 enhances Ccnd1/Cyclin D1 mRNA translation during myogenesis. Nucleic Acids Res 2016; 44:2393-408. [PMID: 26819411 PMCID: PMC4797292 DOI: 10.1093/nar/gkw023] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 01/08/2016] [Indexed: 01/07/2023] Open
Abstract
Skeletal muscle contains long multinucleated and contractile structures known as muscle fibers, which arise from the fusion of myoblasts into multinucleated myotubes during myogenesis. The myogenic regulatory factor (MRF) MYF5 is the earliest to be expressed during myogenesis and functions as a transcription factor in muscle progenitor cells (satellite cells) and myocytes. In mouse C2C12 myocytes, MYF5 is implicated in the initial steps of myoblast differentiation into myotubes. Here, using ribonucleoprotein immunoprecipitation (RIP) analysis, we discovered a novel function for MYF5 as an RNA-binding protein which associated with a subset of myoblast mRNAs. One prominent MYF5 target was Ccnd1 mRNA, which encodes the key cell cycle regulator CCND1 (Cyclin D1). Biotin-RNA pulldown, UV-crosslinking and gel shift experiments indicated that MYF5 was capable of binding the 3' untranslated region (UTR) and the coding region (CR) of Ccnd1 mRNA. Silencing MYF5 expression in proliferating myoblasts revealed that MYF5 promoted CCND1 translation and modestly increased transcription of Ccnd1 mRNA. Accordingly, overexpressing MYF5 in C2C12 cells upregulated CCND1 expression while silencing MYF5 reduced myoblast proliferation as well as differentiation of myoblasts into myotubes. Moreover, MYF5 silencing reduced myogenesis, while ectopically restoring CCND1 abundance partially rescued the decrease in myogenesis seen after MYF5 silencing. We propose that MYF5 enhances early myogenesis in part by coordinately elevating Ccnd1 transcription and Ccnd1 mRNA translation.
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Affiliation(s)
- Amaresh C Panda
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | | | - Clara Di Germanio
- Translational Gerontology Branch, National Institute on Aging, NIH, Baltimore, MD 21224, USA Faculty of Veterinary Medicine, University of Teramo, Teramo, Italy
| | - Xiaoling Yang
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | | | - Ji Heon Noh
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Yongqing Zhang
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Elin Lehrmann
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Dawood B Dudekula
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Supriyo De
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Kevin G Becker
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
| | - Elizabeth J White
- Department of Biochemistry and Molecular Biology and Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Gerald M Wilson
- Department of Biochemistry and Molecular Biology and Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Rafael de Cabo
- Translational Gerontology Branch, National Institute on Aging, NIH, Baltimore, MD 21224, USA
| | - Myriam Gorospe
- Laboratory of Genetics, National Institute on Aging, NIH, Baltimore, MD21224, USA
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40
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Panda AC, Martindale JL, Gorospe M. Affinity Pulldown of Biotinylated RNA for Detection of Protein-RNA Complexes. Bio Protoc 2016; 6:e2062. [PMID: 28516119 DOI: 10.21769/bioprotoc.2062] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
RNA-binding proteins (RBPs) have recently emerged as crucial players in the regulation of gene expression. The interactions of RBPs with target mRNAs control the levels of gene products by altering different regulatory steps, including pre-mRNA splicing and maturation, nuclear mRNA export, and mRNA stability and translation (Glisovic et al., 2008). There are several methodologies available today to identify RNAs bound to specific RBPs; some detect only recombinant molecules in vitro, others detect recombinant and endogenous molecules, while others detect only endogenous molecules. Examples include systematic evolution of ligands by exponential enrichment (SELEX), biotinylated RNA pulldown assay, RNA immunoprecipitation (RIP) assay, electrophoretic mobility shift assay (EMSA), RNA footprinting analysis, and various UV crosslinking and immunoprecipitation (CLIP) methods such as CLIP, PAR-CLIP, and iCLIP (Popova et al., 2015). Here, we describe a simple and informative method to study and identify the RNA region of interaction between an RBP and its target transcript (Panda et al., 2014 and 2016). Its reproducibility and ease of use make this protocol a fast and useful method to identify interactions between RBPs and specific RNAs.
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Affiliation(s)
- Amaresh C Panda
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
| | - Jennifer L Martindale
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
| | - Myriam Gorospe
- Laboratory of Genetics and Genomics, National Institute on Aging, National Institutes of Health, Biomedical Research Center, Baltimore, USA
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41
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Yoon JH, Jo MH, White EJF, De S, Hafner M, Zucconi BE, Abdelmohsen K, Martindale JL, Yang X, Wood WH, Shin YM, Song JJ, Tuschl T, Becker KG, Wilson GM, Hohng S, Gorospe M. AUF1 promotes let-7b loading on Argonaute 2. Genes Dev 2015; 29:1599-604. [PMID: 26253535 PMCID: PMC4536308 DOI: 10.1101/gad.263749.115] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Yoon et al. discovered that RBP AU-rich-binding factor 1 (AUF1) promotes let-7b loading onto Argonaute 2 (AGO2), the catalytic component of the RNA-induced silencing complex (RISC). In turn, AGO2–let-7 triggered target mRNA decay. Eukaryotic gene expression is tightly regulated post-transcriptionally by RNA-binding proteins (RBPs) and microRNAs. The RBP AU-rich-binding factor 1 (AUF1) isoform p37 was found to have high affinity for the microRNA let-7b in vitro (Kd = ∼6 nM) in cells. Ribonucleoprotein immunoprecipitation, in vitro association, and single-molecule-binding analyses revealed that AUF1 promoted let-7b loading onto Argonaute 2 (AGO2), the catalytic component of the RNA-induced silencing complex (RISC). In turn, AGO2–let-7 triggered target mRNA decay. Our findings uncover a novel mechanism by which AUF1 binding and transfer of microRNA let-7 to AGO2 facilitates let-7-elicited gene silencing.
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Affiliation(s)
- Je-Hyun Yoon
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Myung Hyun Jo
- Department of Physics and Astronomy, Institute of Applied Physics, National Center for Creative Research Initiatives, Seoul National University, Seoul 151-747, Korea
| | - Elizabeth J F White
- Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Supriyo De
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Markus Hafner
- Laboratory of Muscle Stem Cells and Gene Regulation, National Institute of Arthritis and Musculoskeletal and Skin Diseases-Intramural Research Program, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Beth E Zucconi
- Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Kotb Abdelmohsen
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Jennifer L Martindale
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Xiaoling Yang
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - William H Wood
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Yu Mi Shin
- Cancer Metastasis Control Center, Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-338, Korea
| | - Ji-Joon Song
- Cancer Metastasis Control Center, Institute for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-338, Korea
| | - Thomas Tuschl
- Howard Hughes Medical Institute, Laboratory of RNA Molecular Biology, Rockefeller University, New York, New York 10065, USA
| | - Kevin G Becker
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
| | - Gerald M Wilson
- Department of Biochemistry and Molecular Biology, Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Sungchul Hohng
- Department of Physics and Astronomy, Institute of Applied Physics, National Center for Creative Research Initiatives, Seoul National University, Seoul 151-747, Korea
| | - Myriam Gorospe
- Laboratory of Genetics, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, Maryland 21224, USA
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Di Foggia V, Zhang X, Licastro D, Gerli MFM, Phadke R, Muntoni F, Mourikis P, Tajbakhsh S, Ellis M, Greaves LC, Taylor RW, Cossu G, Robson LG, Marino S. Bmi1 enhances skeletal muscle regeneration through MT1-mediated oxidative stress protection in a mouse model of dystrophinopathy. ACTA ACUST UNITED AC 2014; 211:2617-33. [PMID: 25452464 PMCID: PMC4267246 DOI: 10.1084/jem.20140317] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Enhanced polycomb complex protein Bmi1 expression in adult stem cells of the skeletal muscle leads to improved muscle function in a model of Duchenne Muscular Dystrophy via metallothionein1-mediated protection from oxidative stress. The Polycomb group (PcG) protein Bmi1 is an essential epigenetic regulator of stem cell function during normal development and in adult organ systems. We show that mild up-regulation of Bmi1 expression in the adult stem cells of the skeletal muscle leads to a remarkable improvement of muscle function in a mouse model of Duchenne muscular dystrophy. The molecular mechanism underlying enhanced physiological function of Bmi1 depends on the injury context and it is mediated by metallothionein 1 (MT1)–driven modulation of resistance to oxidative stress in the satellite cell population. These results lay the basis for developing Bmi1 pharmacological activators, which either alone or in combination with MT1 agonists could be a powerful novel therapeutic approach to improve regeneration in muscle wasting conditions.
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Affiliation(s)
- Valentina Di Foggia
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, England, UK
| | - Xinyu Zhang
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, England, UK
| | | | - Mattia F M Gerli
- Department of Cell and Developmental Biology, University College London, London WC1E 6DE, England, UK
| | - Rahul Phadke
- The Dubowitz Neuromuscular Centre, Institute of Child Health and Great Ormond Street Hospital for Children, London WC1N 3JH, England, UK
| | - Francesco Muntoni
- The Dubowitz Neuromuscular Centre, Institute of Child Health and Great Ormond Street Hospital for Children, London WC1N 3JH, England, UK
| | - Philippos Mourikis
- Stem Cells and Development, Department of Developmental and Stem Cell Biology, Institut Pasteur, CNRS, URA 2578 Paris, France
| | - Shahragim Tajbakhsh
- Stem Cells and Development, Department of Developmental and Stem Cell Biology, Institut Pasteur, CNRS, URA 2578 Paris, France
| | - Matthew Ellis
- Division of Neuropathology, Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, London WC1N 3BG, England, UK
| | - Laura C Greaves
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE4 2HH, England, UK
| | - Robert W Taylor
- Wellcome Trust Centre for Mitochondrial Research, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE4 2HH, England, UK
| | - Giulio Cossu
- Institute for Inflammation and Repair, University of Manchester, Manchester M13 9PL, England, UK
| | - Lesley G Robson
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, England, UK
| | - Silvia Marino
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London E1 2AT, England, UK
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