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Hernandez-Huertas L, Moreno-Sanchez I, Crespo-Cuadrado J, Vargas-Baco A, da Silva Pescador G, Santos-Pereira JM, Bazzini AA, Moreno-Mateos MA. CRISPR-RfxCas13d screening uncovers Bckdk as a post-translational regulator of the maternal-to-zygotic transition in teleosts. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.22.595167. [PMID: 38826327 PMCID: PMC11142190 DOI: 10.1101/2024.05.22.595167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
The Maternal-to-Zygotic transition (MZT) is a reprograming process encompassing zygotic genome activation (ZGA) and the clearance of maternally-provided mRNAs. While some factors regulating MZT have been identified, there are thousands of maternal RNAs whose function has not been ascribed yet. Here, we have performed a proof-of-principle CRISPR-RfxCas13d maternal screening targeting mRNAs encoding protein kinases and phosphatases in zebrafish and identified Bckdk as a novel post-translational regulator of MZT. Bckdk mRNA knockdown caused epiboly defects, ZGA deregulation, H3K27ac reduction and a partial impairment of miR-430 processing. Phospho-proteomic analysis revealed that Phf10/Baf45a, a chromatin remodeling factor, is less phosphorylated upon Bckdk depletion. Further, phf10 mRNA knockdown also altered ZGA and Phf10 constitutively phosphorylated rescued the developmental defects observed after bckdk mRNA depletion. Altogether, our results demonstrate the competence of CRISPR-RfxCas13d screenings to uncover new regulators of early vertebrate development and shed light on the post-translational control of MZT mediated by protein phosphorylation.
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Affiliation(s)
- Luis Hernandez-Huertas
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
- Department of Molecular Biology and Biochemical Engineering, Pablo de Olavide University, Ctra. Utrera Km.1, 41013, Seville, Spain
| | - Ismael Moreno-Sanchez
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
- Department of Molecular Biology and Biochemical Engineering, Pablo de Olavide University, Ctra. Utrera Km.1, 41013, Seville, Spain
| | - Jesús Crespo-Cuadrado
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
| | - Ana Vargas-Baco
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
- Department of Molecular Biology and Biochemical Engineering, Pablo de Olavide University, Ctra. Utrera Km.1, 41013, Seville, Spain
| | | | - José M. Santos-Pereira
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
| | - Ariel A. Bazzini
- Stowers Institute for Medical Research, 1000 E 50th St, Kansas City, MO 64110, USA
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, USA
| | - Miguel A. Moreno-Mateos
- Andalusian Center for Developmental Biology (CABD), Pablo de Olavide University/CSIC/Junta de Andalucía, Ctra. Utrera Km.1, 41013, Seville, Spain
- Department of Molecular Biology and Biochemical Engineering, Pablo de Olavide University, Ctra. Utrera Km.1, 41013, Seville, Spain
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2
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Subramanian E, Elewa A, Brito G, Kumar A, Segerstolpe Å, Karampelias C, Björklund Å, Sandberg R, Echeverri K, Lui WO, Andersson O, Simon A. A small noncoding RNA links ribosome recovery and translation control to dedifferentiation during salamander limb regeneration. Dev Cell 2023; 58:450-460.e6. [PMID: 36893754 DOI: 10.1016/j.devcel.2023.02.007] [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: 09/15/2021] [Revised: 08/11/2022] [Accepted: 02/09/2023] [Indexed: 03/11/2023]
Abstract
Building a blastema from the stump is a key step of salamander limb regeneration. Stump-derived cells temporarily suspend their identity as they contribute to the blastema by a process generally referred to as dedifferentiation. Here, we provide evidence for a mechanism that involves an active inhibition of protein synthesis during blastema formation and growth. Relieving this inhibition results in a higher number of cycling cells and enhances the pace of limb regeneration. By small RNA profiling and fate mapping of skeletal muscle progeny as a cellular model for dedifferentiation, we find that the downregulation of miR-10b-5p is critical for rebooting the translation machinery. miR-10b-5p targets ribosomal mRNAs, and its artificial upregulation causes decreased blastema cell proliferation, reduction in transcripts that encode ribosomal subunits, diminished nascent protein synthesis, and retardation of limb regeneration. Taken together, our data identify a link between miRNA regulation, ribosome biogenesis, and protein synthesis during newt limb regeneration.
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Affiliation(s)
| | - Ahmed Elewa
- Department of Genetics, Microbiology and Statistics, Faculty of Biology, University of Barcelona, Barcelona, Spain
| | - Gonçalo Brito
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Anoop Kumar
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Åsa Segerstolpe
- Klarman Cell Observatory, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Christos Karampelias
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Åsa Björklund
- Department of Cell and Molecular Biology, National Infrastructure of Sweden, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Rickard Sandberg
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Karen Echeverri
- Marine Biological Laboratory, Eugene Bell Center for Regenerative Biology and Tissue Engineering, University of Chicago, Woods Hole, MA, USA
| | - Weng-Onn Lui
- Department of Oncology-Pathology, Karolinska University Hospital, Stockholm, Sweden
| | - Olov Andersson
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - András Simon
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.
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3
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Yu B, Liu J, Zhang J, Mu T, Feng X, Ma R, Gu Y. Regulatory role of RNA N6-methyladenosine modifications during skeletal muscle development. Front Cell Dev Biol 2022; 10:929183. [PMID: 35990615 PMCID: PMC9389409 DOI: 10.3389/fcell.2022.929183] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 06/28/2022] [Indexed: 01/07/2023] Open
Abstract
Functional cells in embryonic myogenesis and postnatal muscle development undergo multiple stages of proliferation and differentiation, which are strict procedural regulation processes. N6-methyladenosine (m6A) is the most abundant RNA modification that regulates gene expression in specific cell types in eukaryotes and regulates various biological activities, such as RNA processing and metabolism. Recent studies have shown that m6A modification-mediated transcriptional and post-transcriptional regulation plays an essential role in myogenesis. This review outlines embryonic and postnatal myogenic differentiation and summarizes the important roles played by functional cells in each developmental period. Furthermore, the key roles of m6A modifications and their regulators in myogenesis were highlighted, and the synergistic regulation of m6A modifications with myogenic transcription factors was emphasized to characterize the cascade of transcriptional and post-transcriptional regulation during myogenesis. This review also discusses the crosstalk between m6A modifications and non-coding RNAs, proposing a novel mechanism for post-transcriptional regulation during skeletal muscle development. In summary, the transcriptional and post-transcriptional regulatory mechanisms mediated by m6A and their regulators may help develop new strategies to maintain muscle homeostasis, which are expected to become targets for animal muscle-specific trait breeding and treatment of muscle metabolic diseases.
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4
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Noncoding RNAs-associated ceRNA networks involved in the amelioration of skeletal muscle aging after whey protein supplementation. J Nutr Biochem 2022; 104:108968. [DOI: 10.1016/j.jnutbio.2022.108968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 01/06/2022] [Accepted: 01/19/2022] [Indexed: 11/23/2022]
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5
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Malik I, Tseng Y, Wright SE, Zheng K, Ramaiyer P, Green KM, Todd PK. SRSF protein kinase 1 modulates RAN translation and suppresses CGG repeat toxicity. EMBO Mol Med 2021; 13:e14163. [PMID: 34542927 PMCID: PMC8573603 DOI: 10.15252/emmm.202114163] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 08/28/2021] [Accepted: 08/30/2021] [Indexed: 11/20/2022] Open
Abstract
Transcribed CGG repeat expansions cause neurodegeneration in Fragile X-associated tremor/ataxia syndrome (FXTAS). CGG repeat RNAs sequester RNA-binding proteins (RBPs) into nuclear foci and undergo repeat-associated non-AUG (RAN) translation into toxic peptides. To identify proteins involved in these processes, we employed a CGG repeat RNA-tagging system to capture repeat-associated RBPs by mass spectrometry in mammalian cells. We identified several SR (serine/arginine-rich) proteins that interact selectively with CGG repeats basally and under cellular stress. These proteins modify toxicity in a Drosophila model of FXTAS. Pharmacologic inhibition of serine/arginine protein kinases (SRPKs), which alter SRSF protein phosphorylation, localization, and activity, directly inhibits RAN translation of CGG and GGGGCC repeats (associated with C9orf72 ALS/FTD) and triggers repeat RNA retention in the nucleus. Lowering SRPK expression suppressed toxicity in both FXTAS and C9orf72 ALS/FTD model flies, and SRPK inhibitors suppressed CGG repeat toxicity in rodent neurons. Together, these findings demonstrate roles for CGG repeat RNA binding proteins in RAN translation and repeat toxicity and support further evaluation of SRPK inhibitors in modulating RAN translation associated with repeat expansion disorders.
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Affiliation(s)
- Indranil Malik
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
| | - Yi‐Ju Tseng
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
- Cellular and Molecular Biology Graduate ProgramUniversity of MichiganAnn ArborMIUSA
| | - Shannon E Wright
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
- Neuroscience Graduate ProgramUniversity of MichiganAnn ArborMIUSA
| | - Kristina Zheng
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
| | | | - Katelyn M Green
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
- Cellular and Molecular Biology Graduate ProgramUniversity of MichiganAnn ArborMIUSA
| | - Peter K Todd
- Department of NeurologyUniversity of MichiganAnn ArborMIUSA
- Ann Arbor Veterans Administration HealthcareAnn ArborMIUSA
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6
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Xie SJ, Lei H, Yang B, Diao LT, Liao JY, He JH, Tao S, Hu YX, Hou YR, Sun YJ, Peng YW, Zhang Q, Xiao ZD. Dynamic m 6A mRNA Methylation Reveals the Role of METTL3/14-m 6A-MNK2-ERK Signaling Axis in Skeletal Muscle Differentiation and Regeneration. Front Cell Dev Biol 2021; 9:744171. [PMID: 34660602 PMCID: PMC8517268 DOI: 10.3389/fcell.2021.744171] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 09/10/2021] [Indexed: 11/25/2022] Open
Abstract
N6-methyladenosine (m6A) RNA methylation has emerged as an important factor in various biological processes by regulating gene expression. However, the dynamic profile, function and underlying molecular mechanism of m6A modification during skeletal myogenesis remain elusive. Here, we report that members of the m6A core methyltransferase complex, METTL3 and METTL14, are downregulated during skeletal muscle development. Overexpression of either METTL3 or METTL14 dramatically blocks myotubes formation. Correspondingly, knockdown of METTL3 or METTL14 accelerates the differentiation of skeletal muscle cells. Genome-wide transcriptome analysis suggests ERK/MAPK is the downstream signaling pathway that is regulated to the greatest extent by METTL3/METTL14. Indeed, METTL3/METTL14 expression facilitates ERK/MAPK signaling. Via MeRIP-seq, we found that MNK2, a critical regulator of ERK/MAPK signaling, is m6A modified and is a direct target of METTL3/METTL14. We further revealed that YTHDF1 is a potential reader of m6A on MNK2, regulating MNK2 protein levels without affecting mRNA levels. Furthermore, we discovered that METTL3/14-MNK2 axis was up-regulated notably after acute skeletal muscle injury. Collectively, our studies revealed that the m6A writers METTL3/METTL14 and the m6A reader YTHDF1 orchestrate MNK2 expression posttranscriptionally and thus control ERK signaling, which is required for the maintenance of muscle myogenesis and may contribute to regeneration.
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Affiliation(s)
- Shu-Juan Xie
- Vaccine Research Institute of Sun Yat-sen University, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Hang Lei
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Bing Yang
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Li-Ting Diao
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Jian-You Liao
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Jie-Hua He
- Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, Medical Research Center, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Shuang Tao
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yan-Xia Hu
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Ya-Rui Hou
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yu-Jia Sun
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Yan-Wen Peng
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Qi Zhang
- Vaccine Research Institute of Sun Yat-sen University, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.,Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
| | - Zhen-Dong Xiao
- Biotherapy Center, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
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7
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Wu S, Wagner G. Deep computational analysis details dysregulation of eukaryotic translation initiation complex eIF4F in human cancers. Cell Syst 2021; 12:907-923.e6. [PMID: 34358439 DOI: 10.1016/j.cels.2021.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 04/22/2021] [Accepted: 07/09/2021] [Indexed: 12/28/2022]
Abstract
eIF4F plays diverse roles in human cancers, which complicate the development of an overarching understanding of its functional and regulatory impacts across tumor types. Typically, eIF4F drives initiation from the mRNA 5' end (cap) and is composed of eIF4G1, eIF4A1, and cap-binding eIF4E. Cap-independent initiation is possible without eIF4E, from internal ribosomal entry sites (IRESs). By analyzing large public datasets, we found that cancers selectively overexpress EIF4G1 more than EIF4E. That expression imbalance supports EIF4G1 as a prognostic indicator in patients with cancer. It also attenuates "housekeeping" pathways that are usually regulated in a tissue-specific manner via cap-dependent initiation in healthy tissues and reinforce regulation of cancer-preferred pathways in cap-independent contexts. Cap-independent initiation is mechanistically attributable to eIF4G1 hyperphosphorylation that promotes binding to eIF4A1 and reduced eIF4E availability. Collectively, these findings reveal a novel model of dysregulated eIF4F function and highlight the clinical relevance of cap-(in)dependent initiation in cancer.
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Affiliation(s)
- Su Wu
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.
| | - Gerhard Wagner
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115, USA.
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8
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MNK1 and MNK2 enforce expression of E2F1, FOXM1, and WEE1 to drive soft tissue sarcoma. Oncogene 2021; 40:1851-1867. [PMID: 33564073 PMCID: PMC7946644 DOI: 10.1038/s41388-021-01661-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 12/25/2020] [Accepted: 01/15/2021] [Indexed: 01/31/2023]
Abstract
Soft tissue sarcoma (STS) is a heterogeneous disease that arises from connective tissues. Clinical outcome of patients with advanced tumors especially de-differentiated liposarcoma and uterine leiomyosarcoma remains unsatisfactory, despite intensive treatment regimens including maximal surgical resection, radiation, and chemotherapy. MAP kinase-interacting serine/threonine-protein kinase 1 and 2 (MNK1/2) have been shown to contribute to oncogenic translation via phosphorylation of eukaryotic translation initiation factor 4E (eIF4E). However, little is known about the role of MNK1/2 and their downstream targets in STS. In this study, we show that depletion of either MNK1 or MNK2 suppresses cell viability, anchorage-independent growth, and tumorigenicity of STS cells. We also identify a compelling antiproliferative efficacy of a novel, selective MNK inhibitor ETC-168. Cellular responsiveness of STS cells to ETC-168 correlates positively with that of phosphorylated ribosomal protein S6 (RPS6). Mirroring MNK1/2 silencing, ETC-168 treatment strongly blocks eIF4E phosphorylation and represses expression of sarcoma-driving onco-proteins including E2F1, FOXM1, and WEE1. Moreover, combination of ETC-168 and MCL1 inhibitor S63845 exerts a synergistic antiproliferative activity against STS cells. In summary, our study reveals crucial roles of MNK1/2 and their downstream targets in STS tumorigenesis. Our data encourage further clinical translation of MNK inhibitors for STS treatment.
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9
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Ferrandi PJ, Khan MM, Paez HG, Pitzer CR, Alway SE, Mohamed JS. Transcriptome Analysis of Skeletal Muscle Reveals Altered Proteolytic and Neuromuscular Junction Associated Gene Expressions in a Mouse Model of Cerebral Ischemic Stroke. Genes (Basel) 2020; 11:genes11070726. [PMID: 32629989 PMCID: PMC7397267 DOI: 10.3390/genes11070726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 12/24/2022] Open
Abstract
Stroke is a leading cause of mortality and long-term disability in patients worldwide. Skeletal muscle is the primary systemic target organ of stroke that induces muscle wasting and weakness, which predominantly contribute to functional disability in stroke patients. Currently, no pharmacological drug is available to treat post-stroke muscle morbidities as the mechanisms underlying post-stroke muscle wasting remain poorly understood. To understand the stroke-mediated molecular changes occurring at the transcriptional level in skeletal muscle, the gene expression profiles and enrichment pathways were explored in a mouse model of cerebral ischemic stroke via high-throughput RNA sequencing and extensive bioinformatic analyses. RNA-seq revealed that the elevated muscle atrophy observed in response to stroke was associated with the altered expression of genes involved in proteolysis, cell cycle, extracellular matrix remodeling, and the neuromuscular junction (NMJ). These data suggest that stroke primarily targets muscle protein degradation and NMJ pathway proteins to induce muscle atrophy. Collectively, we for the first time have found a novel genome-wide transcriptome signature of post-stroke skeletal muscle in mice. Our study will provide critical information to further elucidate specific gene(s) and pathway(s) that can be targeted to mitigate accountable for post-stroke muscle atrophy and related weakness.
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Affiliation(s)
- Peter J. Ferrandi
- Laboratory of Muscle and Nerve, Department of Diagnostic and Health Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
| | - Mohammad Moshahid Khan
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
- Department of Neurology, College of Medicine, The University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Hector G. Paez
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
- Laboratory of Muscle Biology and Sarcopenia, Department of Physical Therapy, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Christopher R. Pitzer
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
- Laboratory of Muscle Biology and Sarcopenia, Department of Physical Therapy, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Stephen E. Alway
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
- Laboratory of Muscle Biology and Sarcopenia, Department of Physical Therapy, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Junaith S. Mohamed
- Laboratory of Muscle and Nerve, Department of Diagnostic and Health Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA;
- Center for Muscle, Metabolism and Neuropathology, Division of Rehabilitation Sciences, College of Health Professions, University of Tennessee Health Science Center, Memphis, TN 38163, USA; (M.M.K.); (H.G.P.); (C.R.P.); (S.E.A.)
- Correspondence: ; Tel.: +1-901-448-8560
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10
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Li J, Lu Y, Li N, Li P, Su J, Wang Z, Wang T, Yang Z, Yang Y, Chen H, Xiao L, Duan H, Wu W, Liu X. Muscle metabolomics analysis reveals potential biomarkers of exercise‑dependent improvement of the diaphragm function in chronic obstructive pulmonary disease. Int J Mol Med 2020; 45:1644-1660. [PMID: 32186768 PMCID: PMC7169662 DOI: 10.3892/ijmm.2020.4537] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 02/17/2020] [Indexed: 12/25/2022] Open
Abstract
Decreased diaphragm function is a crucial factor leading to reduced ventilatory efficiency and worsening of quality of life in chronic obstructive pulmonary disease (COPD). Exercise training has been demonstrated to effectively improve the function of the diaphragm. However, the mechanism of this process has not been identified. The emergence of metabolomics has allowed the exploration of new ideas. The present study aimed to analyze the potential biomarkers of exercise-dependent enhancement of diaphragm function in COPD using metabolomics. Sprague Dawley rats were divided into three groups: COPD + exercise group (CEG); COPD model group (CMG); and control group (CG). The first two groups were exposed to cigarette smoke for 16 weeks to establish a COPD model. Then, the rats in the CEG underwent aerobic exercise training for 9 weeks. Following confirmation that exercise effectively improved the diaphragm function, a gas chromatography tandem time-of-flight mass spectrometry analysis system was used to detect the differential metabolites and associated pathways in the diaphragm muscles of the different groups. Following exercise intervention, the pulmonary function and diaphragm contractility of the CEG rats were significantly improved compared with those of the CMG rats. A total of 36 different metabolites were identified in the comparison between the CMG and the CG. Pathway enrichment analysis indicated that these different metabolites were involved in 17 pathways. A total of 29 different metabolites were identified in the comparison between the CMG and the CEG, which are involved in 14 pathways. Candidate biomarkers were selected, and the pathways analysis of these metabolites demonstrated that 2 types of metabolic pathways, the nicotinic acid and nicotinamide metabolism and arginine and proline metabolism pathways, were associated with exercise-induced pulmonary rehabilitation.
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Affiliation(s)
- Jian Li
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Yufan Lu
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Ning Li
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Peijun Li
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Jianqing Su
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Zhengrong Wang
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Ting Wang
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Zhaoyu Yang
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Yahui Yang
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Haixia Chen
- School of Physical Education and Sport Training, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Lu Xiao
- School of Rehabilitation Science, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, P.R. China
| | - Hongxia Duan
- School of Rehabilitation Science, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, P.R. China
| | - Weibing Wu
- Department of Sports Medicine, Shanghai University of Sport, Shanghai 200438, P.R. China
| | - Xiaodan Liu
- School of Rehabilitation Science, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, P.R. China
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11
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Ichiyanagi O, Ito H, Naito S, Kabasawa T, Kanno H, Narisawa T, Ushijima M, Kurota Y, Ozawa M, Sakurai T, Nishida H, Kato T, Yamakawa M, Tsuchiya N. Impact of eIF4E phosphorylation at Ser209 via MNK2a on tumour recurrence after curative surgery in localized clear cell renal cell carcinoma. Oncotarget 2019; 10:4053-4068. [PMID: 31258849 PMCID: PMC6592294 DOI: 10.18632/oncotarget.27017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 05/20/2019] [Indexed: 01/01/2023] Open
Abstract
Background: We investigated the roles of eIF4E phosphorylation (Ser209) in tumour recurrence after curative nephrectomy for localized clear cell renal cell carcinoma (ccRCC). Methods: Expression of eIF4E, p eIF4E and MNKs (MAPK interacting kinases), was evaluated in surgical specimens obtained from consecutive non metastatic ccRCC patients (n = 290) by immunohistochemistry (IHC), immunoblotting, and qRT PCR at the protein and mRNA levels. In human RCC cell lines, the effects of eIF4E phosphorylation were examined using immunoblotting, proliferation, migration and invasion assays with pharmacological inhibitors (CGP57380 or ETP45835) and specific small interfering (si) RNAs against MNK1/2(a/b). Results: In postoperative follow-up (median, 7.9 y), 40 patients experienced metastatic recurrence. In multivariate Cox analyses, higher IHC expression of p eIF4E in ccRCC significantly predicted a longer recurrence-free interval. eIF4E is phosphorylated mainly by MNK2a in tumour specimens and cell lines. In 786-O and A-498 cell lines, pharmacological inhibition of MNKs decreased p-eIF4E and increased vimentin and N cadherin but did not influence proliferation. Similarly, MNK2 or MNK2a inhibition with siRNA reduced p-eIF4E and enhanced vimentin translation, cell migration and invasion in the cell lines. Conclusions: MNK2a-induced eIF4E phosphorylation may suppress metastatic recurrence of ccRCC, partially due to vimentin downregulation at the translational level, consequently leading to inhibition of epithelial–mesenchymal transition.
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Affiliation(s)
- Osamu Ichiyanagi
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan.,Department of Urology, Yamagata Prefectural Kahoku Hospital, Kahoku, Japan
| | - Hiromi Ito
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Sei Naito
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Takanobu Kabasawa
- Department of Pathological Diagnostics, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Hidenori Kanno
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Takafumi Narisawa
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Masaki Ushijima
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Yuta Kurota
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Michinobu Ozawa
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Toshihiko Sakurai
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Hayato Nishida
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Tomoyuki Kato
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Mitsunori Yamakawa
- Department of Pathological Diagnostics, Yamagata University Faculty of Medicine, Yamagata, Japan
| | - Norihiko Tsuchiya
- Department of Urology, Yamagata University Faculty of Medicine, Yamagata, Japan
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12
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Nel M, Mulder N, Europa TA, Heckmann JM. Using Whole Genome Sequencing in an African Subphenotype of Myasthenia Gravis to Generate a Pathogenetic Hypothesis. Front Genet 2019; 10:136. [PMID: 30881381 PMCID: PMC6406016 DOI: 10.3389/fgene.2019.00136] [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: 11/12/2018] [Accepted: 02/11/2019] [Indexed: 12/25/2022] Open
Abstract
Myasthenia gravis (MG) is a rare, treatable antibody-mediated disease which is characterized by muscle weakness. The pathogenic antibodies are most frequently directed at the acetylcholine receptors (AChRs) at the skeletal muscle endplate. An ophthalmoplegic subphenotype of MG (OP-MG), which is characterized by treatment resistant weakness of the extraocular muscles (EOMs), occurs in a proportion of myasthenics with juvenile symptom onset and African genetic ancestry. Since the pathogenetic mechanism(s) underlying OP-MG is unknown, the aim of this study was to use a hypothesis-generating genome-wide analysis to identify candidate OP-MG susceptibility genes and pathways. Whole genome sequencing (WGS) was performed on 25 AChR-antibody positive myasthenic individuals of African genetic ancestry sampled from the phenotypic extremes: 15 with OP-MG and 10 individuals with control MG (EOM treatment-responsive). Variants were called according to the Genome Analysis Toolkit (GATK) best practice guidelines using the hg38 reference genome. In addition to single variant association analysis, variants were mapped to genes (±200 kb) using VEGAS2 to calculate gene-based test statistics and HLA allele group assignment was inferred through "best-match" alignment of reads against the IMGT/HLA database. While there were no single variant associations that reached genome-wide significance in this exploratory sample, several genes with significant gene-based test statistics and known to be expressed in skeletal muscle had biological functions which converge on muscle atrophy signaling and myosin II function. The closely linked HLA-DPA1 and HLA-DPB1 genes were associated with OP-MG subjects (gene-based p < 0.05) and the frequency of a functional A > G SNP (rs9277534) in the HLA-DPB1 3'UTR, which increases HLA-DPB1 expression, differed between the two groups (G-allele 0.30 in OP-MG vs. 0.60 in control MG; p = 0.04). Furthermore, we show that rs9277534 is an HLA-DBP1 expression quantitative trait locus in patient-derived myocytes (p < 1 × 10-3). The application of a SNP to gene to pathway approach to this exploratory WGS dataset of African myasthenic individuals, and comparing dichotomous subphenotypes, resulted in the identification of candidate genes and pathways that may contribute to OP-MG susceptibility. Overall, the hypotheses generated by this work remain to be verified by interrogating candidate gene and pathway expression in patient-derived extraocular muscle.
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Affiliation(s)
- Melissa Nel
- Neurology Research Group, Division of Neurology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Nicola Mulder
- Computational Biology Division, Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Tarin A Europa
- Neurology Research Group, Division of Neurology, Department of Medicine, University of Cape Town, Cape Town, South Africa
| | - Jeannine M Heckmann
- Neurology Research Group, Division of Neurology, Department of Medicine, University of Cape Town, Cape Town, South Africa
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13
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Argueta C, Kashyap T, Klebanov B, Unger TJ, Guo C, Harrington S, Baloglu E, Lee M, Senapedis W, Shacham S, Landesman Y. Selinexor synergizes with dexamethasone to repress mTORC1 signaling and induce multiple myeloma cell death. Oncotarget 2018; 9:25529-25544. [PMID: 29876006 PMCID: PMC5986633 DOI: 10.18632/oncotarget.25368] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 04/25/2018] [Indexed: 12/12/2022] Open
Abstract
Multiple myeloma (MM) is a plasma cell neoplasm that results in over 11,000 deaths in the United States annually. The backbone therapy for the treatment of MM patients almost always includes combinations with corticosteroids such as dexamethasone (DEX). We found that DEX in combination with selinexor, an inhibitor of exportin-1 (XPO1) activity, synergistically inhibits the mTOR pathway and subsequently promotes cell death in MM cells. Specifically, we show that selinexor induces the expression of the glucocorticoid receptor (GR) and when combined with dexamethasone increases GR transcriptional activity. Moreover, we found that key downstream targets of the mTOR pathway are deregulated by the combination and identified a mechanism in which GR enhances the expression of REDD1 in GR positive cells while suppressing mTOR activity and cell viability. While the single agent activity of selinexor in MM cells appears to be GR-independent, synergy with DEX depends on GR expression. These data suggest that patients with tumor cells that are GR positive will benefit substantially from the combination. The current findings are consistent with the beneficial therapeutic outcome in patients with MM when treated with the combination of selinexor and DEX. In addition, they provide a rationale for testing GR and REDD1 as predictive and prognostic markers of response, respectively, for patients treated with this beneficial combination.
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Affiliation(s)
| | | | | | | | - Cathy Guo
- Karyopharm Therapeutics Inc, Newton, MA 02459, USA
| | | | | | - Margaret Lee
- Karyopharm Therapeutics Inc, Newton, MA 02459, USA
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14
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Brown MC, Gromeier M. MNK Controls mTORC1:Substrate Association through Regulation of TELO2 Binding with mTORC1. Cell Rep 2017; 18:1444-1457. [PMID: 28178522 DOI: 10.1016/j.celrep.2017.01.023] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 12/09/2016] [Accepted: 01/11/2017] [Indexed: 01/20/2023] Open
Abstract
The mechanistic target of rapamycin (mTOR) integrates numerous stimuli and coordinates the adaptive response of many cellular processes. To accomplish this, mTOR associates with distinct co-factors that determine its signaling output. While many of these co-factors are known, in many cases their function and regulation remain opaque. The MAPK-interacting kinase (MNK) contributes to rapamycin resistance in cancer cells. Here, we demonstrate that MNK sustains mTORC1 activity following rapamycin treatment and contributes to mTORC1 signaling following T cell activation and growth stimuli in cancer cells. We determine that MNK engages with mTORC1, promotes mTORC1 association with the phosphatidyl inositol 3' kinase-related kinase (PIKK) stabilizer, TELO2, and facilitates mTORC1:substrate binding. Moreover, our data suggest that DEPTOR, the endogenous inhibitor of mTOR, opposes mTORC1:substrate association by preventing TELO2:mTORC1 binding. Thus, MNK orchestrates counterbalancing forces that regulate mTORC1 enzymatic activity.
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Affiliation(s)
- Michael C Brown
- Department of Neurosurgery, Duke University Medical Center, Durham, NC 27710, USA.
| | - Matthias Gromeier
- Department of Neurosurgery, Duke University Medical Center, Durham, NC 27710, USA
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15
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Cho KS, Lee IM, Sim S, Lee EJ, Gonzales EL, Ryu JH, Cheong JH, Shin CY, Kwon KJ, Han SH. Ginkgo bilobaExtract (EGb 761®) Inhibits Glutamate-induced Up-regulation of Tissue Plasminogen Activator Through Inhibition of c-Fos Translocation in Rat Primary Cortical Neurons. Phytother Res 2015; 30:58-65. [DOI: 10.1002/ptr.5500] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 08/20/2015] [Accepted: 09/29/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Kyu Suk Cho
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
| | - Ian Myungwon Lee
- Department of Family Medicine, Brain Korea 21 Project Medical Science, College of Medicine; Korea University; Seoul Korea
| | - Seobo Sim
- Department of Environmental and Tropical Medicine, KU Open Innovation Center; Konkuk University School of Medicine; Seoul Korea
| | - Eun Joo Lee
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
| | - Edson Luck Gonzales
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
| | - Jong Hoon Ryu
- Department of Oriental Pharmaceutical Science, College of Pharmacy; Kyung Hee University; Seoul Korea
| | - Jae Hoon Cheong
- Department of Pharmacy, College of Pharmacy; Sahmyook University; Seoul Korea
| | - Chan Young Shin
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
| | - Kyoung Ja Kwon
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
- Department of Neurology; Konkuk University Medical Center; Seoul Korea
| | - Seol-Heui Han
- Department of Neuroscience, Center of Neuroscience Research; Konkuk University School of Medicine; Seoul Korea
- Department of Neurology; Konkuk University Medical Center; Seoul Korea
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16
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Morooka S, Hoshina M, Kii I, Okabe T, Kojima H, Inoue N, Okuno Y, Denawa M, Yoshida S, Fukuhara J, Ninomiya K, Ikura T, Furuya T, Nagano T, Noda K, Ishida S, Hosoya T, Ito N, Yoshimura N, Hagiwara M. Identification of a Dual Inhibitor of SRPK1 and CK2 That Attenuates Pathological Angiogenesis of Macular Degeneration in Mice. Mol Pharmacol 2015; 88:316-25. [PMID: 25993998 DOI: 10.1124/mol.114.097345] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 05/20/2015] [Indexed: 12/28/2022] Open
Abstract
Excessive angiogenesis contributes to numerous diseases, including cancer and blinding retinopathy. Antibodies against vascular endothelial growth factor (VEGF) have been approved and are widely used in clinical treatment. Our previous studies using SRPIN340, a small molecule inhibitor of SRPK1 (serine-arginine protein kinase 1), demonstrated that SRPK1 is a potential target for the development of antiangiogenic drugs. In this study, we solved the structure of SRPK1 bound to SRPIN340 by X-ray crystallography. Using pharmacophore docking models followed by in vitro kinase assays, we screened a large-scale chemical library, and thus identified a new inhibitor of SRPK1. This inhibitor, SRPIN803, prevented VEGF production more effectively than SRPIN340 owing to the dual inhibition of SRPK1 and CK2 (casein kinase 2). In a mouse model of age-related macular degeneration, topical administration of eye ointment containing SRPIN803 significantly inhibited choroidal neovascularization, suggesting a clinical potential of SRPIN803 as a topical ointment for ocular neovascularization. Thus SRPIN803 merits further investigation as a novel inhibitor of VEGF.
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Affiliation(s)
- Satoshi Morooka
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Mitsuteru Hoshina
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Isao Kii
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Takayoshi Okabe
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Hirotatsu Kojima
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Naoko Inoue
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Yukiko Okuno
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Masatsugu Denawa
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Suguru Yoshida
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Junichi Fukuhara
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Kensuke Ninomiya
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Teikichi Ikura
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Toshio Furuya
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Tetsuo Nagano
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Kousuke Noda
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Susumu Ishida
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Takamitsu Hosoya
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Nobutoshi Ito
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Nagahisa Yoshimura
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
| | - Masatoshi Hagiwara
- Department of Ophthalmology and Visual Sciences (S.M., N.Y.), Department of Anatomy and Developmental Biology (S.M., I.K., Ke.N., Ma.H.), and Medical Research Support Center (Y.O., M.D.), Graduate School of Medicine, Kyoto University, Kyoto, Japan; Laboratory of Structural Biology, Medical Research Institute (Mi.H., No.I., T.I.), and Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering (S.Y., T.H.), Tokyo Medical and Dental University, Tokyo, Japan; Open Innovation Center for Drug Discovery, The University of Tokyo, Tokyo, Japan (T.O., H.K., T.N.); PharmaDesign, Inc., Tokyo, Japan (Na.I., T.F.); and Department of Ophthalmology, Graduate School of Medicine, Hokkaido University, Sapporo, Japan (J.F., Ko.N., S.I.)
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Proud CG. Mnks, eIF4E phosphorylation and cancer. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1849:766-73. [PMID: 25450520 DOI: 10.1016/j.bbagrm.2014.10.003] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Revised: 10/06/2014] [Accepted: 10/18/2014] [Indexed: 01/18/2023]
Abstract
The MAP kinase signal-integrating kinases or MAP kinase-interacting protein kinases (Mnks) are activated by signaling through the oncogenic MAP kinase (ERK) pathway. The best-known Mnk substrate is eukaryotic initiation factor eIF4E, the protein which binds the 5'-cap structure of eukaryotic mRNAs and helps to recruit ribosomes to them. eIF4E is a well-established proto-oncogene, whose expression or activation is associated with transformation and tumorigenesis. Mnks phosphorylate eIF4E at a single site. Increasing evidence implicates the Mnks and/or phosphorylation of eIF4E in cell transformation, tumorigenesis or tumor progression, in a growing range of settings. Mnks and/or the phosphorylation of eIF4E have been suggested to regulate the expression of proteins involved in cell cycle progression, cell survival and cell motility. Further work is needed to extend our understanding of the impact of the Mnks on gene expression, explore the biochemical mechanisms involved and evaluate the utility of targeting the Mnks in cancer therapy. This article is part of a Special Issue entitled: Translation and Cancer.
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Affiliation(s)
- Christopher G Proud
- South Australian Health & Medical Research Institute, North Terrace, Adelaide, SA 5000, Australia.
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18
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Induction of viral, 7-methyl-guanosine cap-independent translation and oncolysis by mitogen-activated protein kinase-interacting kinase-mediated effects on the serine/arginine-rich protein kinase. J Virol 2014; 88:13135-48. [PMID: 25187541 DOI: 10.1128/jvi.01883-14] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
UNLABELLED Protein synthesis, the most energy-consuming process in cells, responds to changing physiologic priorities, e.g., upon mitogen- or stress-induced adaptations signaled through the mitogen-activated protein kinases (MAPKs). The prevailing status of protein synthesis machinery is a viral pathogenesis factor, particularly for plus-strand RNA viruses, where immediate translation of incoming viral RNAs shapes host-virus interactions. In this study, we unraveled signaling pathways centered on the ERK1/2 and p38α MAPK-interacting kinases MNK1/2 and their role in controlling 7-methyl-guanosine (m(7)G) "cap"-independent translation at enterovirus type 1 internal ribosomal entry sites (IRESs). Activation of Raf-MEK-ERK1/2 signals induced viral IRES-mediated translation in a manner dependent on MNK1/2. This effect was not due to MNK's known functions as eukaryotic initiation factor (eIF) 4G binding partner or eIF4E(S209) kinase. Rather, MNK catalytic activity enabled viral IRES-mediated translation/host cell cytotoxicity through negative regulation of the Ser/Arg (SR)-rich protein kinase (SRPK). Our investigations suggest that SRPK activity is a major determinant of type 1 IRES competency, host cell cytotoxicity, and viral proliferation in infected cells. IMPORTANCE We are targeting unfettered enterovirus IRES activity in cancer with PVSRIPO, the type 1 live-attenuated poliovirus (PV) (Sabin) vaccine containing a human rhinovirus type 2 (HRV2) IRES. A phase I clinical trial of PVSRIPO with intratumoral inoculation in patients with recurrent glioblastoma (GBM) is showing early promise. Viral translation proficiency in infected GBM cells is a core requirement for the antineoplastic efficacy of PVSRIPO. Therefore, it is critically important to understand the mechanisms controlling viral cap-independent translation in infected host cells.
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19
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Mitogen-activated protein kinase-interacting kinase regulates mTOR/AKT signaling and controls the serine/arginine-rich protein kinase-responsive type 1 internal ribosome entry site-mediated translation and viral oncolysis. J Virol 2014; 88:13149-60. [PMID: 25187540 DOI: 10.1128/jvi.01884-14] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
UNLABELLED Translation machinery is a major recipient of the principal mitogenic signaling networks involving Raf-ERK1/2 and phosphoinositol 3-kinase (PI3K)-mechanistic target of rapamycin (mTOR). Picornavirus internal ribosomal entry site (IRES)-mediated translation and cytopathogenic effects are susceptible to the status of such signaling cascades in host cells. We determined that tumor-specific cytotoxicity of the poliovirus/rhinovirus chimera PVSRIPO is facilitated by Raf-ERK1/2 signals to the mitogen-activated protein kinase (MAPK)-interacting kinase (MNK) and its effects on the partitioning/activity of the Ser/Arg (SR)-rich protein kinase (SRPK) (M. C. Brown, J. D. Bryant, E. Y. Dobrikova, M. Shveygert, S. S. Bradrick, V. Chandramohan, D. D. Bigner, and M, Gromeier, J. Virol. 22:13135-13148, 2014, doi:http://dx.doi.org/10.1128/JVI.01883-14). Here, we show that MNK regulates SRPK via mTOR and AKT. Our investigations revealed a MNK-controlled mechanism acting on mTORC2-AKT. The resulting suppression of AKT signaling attenuates SRPK activity to enhance picornavirus type 1 IRES translation and favor PVSRIPO tumor cell toxicity and killing. IMPORTANCE Oncolytic immunotherapy with PVSRIPO, the type 1 live-attenuated poliovirus (PV) (Sabin) vaccine containing a human rhinovirus type 2 (HRV2) IRES, is demonstrating early promise in clinical trials with intratumoral infusion in recurrent glioblastoma (GBM). Our investigations demonstrate that the core mechanistic principle of PVSRIPO, tumor-selective translation and cytotoxicity, relies on constitutive ERK1/2-MNK signals that counteract the deleterious effects of runaway AKT-SRPK activity in malignancy.
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20
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León K, Boulo T, Musnier A, Morales J, Gauthier C, Dupuy L, Heyne S, Backofen R, Poupon A, Cormier P, Reiter E, Crepieux P. Activation of a GPCR leads to eIF4G phosphorylation at the 5' cap and to IRES-dependent translation. J Mol Endocrinol 2014; 52:373-82. [PMID: 24711644 DOI: 10.1530/jme-14-0009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The control of mRNA translation has been mainly explored in response to activated tyrosine kinase receptors. In contrast, mechanistic details on the translational machinery are far less available in the case of ligand-bound G protein-coupled receptors (GPCRs). In this study, using the FSH receptor (FSH-R) as a model receptor, we demonstrate that part of the translational regulations occurs by phosphorylation of the translation pre-initiation complex scaffold protein, eukaryotic initiation factor 4G (eIF4G), in HEK293 cells stably expressing the FSH-R. This phosphorylation event occurred when eIF4G was bound to the mRNA 5' cap, and probably involves mammalian target of rapamycin. This regulation might contribute to cap-dependent translation in response to FSH. The cap-binding protein eIF4E also had its phosphorylation level enhanced upon FSH stimulation. We also show that FSH-induced signaling not only led to cap-dependent translation but also to internal ribosome entry site (IRES)-dependent translation of some mRNA. These data add detailed information on the molecular bases underlying the regulation of selective mRNA translation by a GPCR, and a topological model recapitulating these mechanisms is proposed.
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Affiliation(s)
- Kelly León
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Thomas Boulo
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Astrid Musnier
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Julia Morales
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, Germany
| | - Christophe Gauthier
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Laurence Dupuy
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Steffen Heyne
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, Germany
| | - Rolf Backofen
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, Germany
| | - Anne Poupon
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Patrick Cormier
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, Germany
| | - Eric Reiter
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
| | - Pascale Crepieux
- UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
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Maimon A, Mogilevsky M, Shilo A, Golan-Gerstl R, Obiedat A, Ben-Hur V, Lebenthal-Loinger I, Stein I, Reich R, Beenstock J, Zehorai E, Andersen C, Thorsen K, Ørntoft T, Davis R, Davidson B, Mu D, Karni R. Mnk2 Alternative Splicing Modulates the p38-MAPK Pathway and Impacts Ras-Induced Transformation. Cell Rep 2014; 7:501-513. [DOI: 10.1016/j.celrep.2014.03.041] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Revised: 02/13/2014] [Accepted: 03/13/2014] [Indexed: 11/29/2022] Open
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22
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Grzmil M, Huber RM, Hess D, Frank S, Hynx D, Moncayo G, Klein D, Merlo A, Hemmings BA. MNK1 pathway activity maintains protein synthesis in rapalog-treated gliomas. J Clin Invest 2014; 124:742-54. [PMID: 24401275 DOI: 10.1172/jci70198] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 10/30/2013] [Indexed: 01/20/2023] Open
Abstract
High levels of mammalian target of rapamycin complex 1 (mTORC1) activity in malignant gliomas promote tumor progression, suggesting that targeting mTORC1 has potential as a therapeutic strategy. Remarkably, clinical trials in patients with glioma revealed that rapamycin analogs (rapalogs) have limited efficacy, indicating activation of resistance mechanisms. Targeted depletion of MAPK-interacting Ser/Thr kinase 1 (MNK1) sensitizes glioma cells to the mTORC1 inhibitor rapamycin through an indistinct mechanism. Here, we analyzed how MNK1 and mTORC1 signaling pathways regulate the assembly of translation initiation complexes, using the cap analog m7GTP to enrich for initiation complexes in glioma cells followed by mass spectrometry-based quantitative proteomics. Association of eukaryotic translation initiation factor 4E (eIF4E) with eIF4E-binding protein 1 (4EBP1) was regulated by the mTORC1 pathway, whereas pharmacological blocking of MNK activity by CGP57380 or MNK1 knockdown, along with mTORC1 inhibition by RAD001, increased 4EBP1 binding to eIF4E. Furthermore, combined MNK1 and mTORC1 inhibition profoundly inhibited 4EBP1 phosphorylation at Ser65, protein synthesis and proliferation in glioma cells, and reduced tumor growth in an orthotopic glioblastoma (GBM) mouse model. Immunohistochemical analysis of GBM samples revealed increased 4EBP1 phosphorylation. Taken together, our data indicate that rapalog-activated MNK1 signaling promotes glioma growth through regulation of 4EBP1 and indicate a molecular cross-talk between the mTORC1 and MNK1 pathways that has potential to be exploited therapeutically.
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Abstract
The molecular mechanisms underlying skeletal muscle maintenance involve interplay between multiple signaling pathways. Under normal physiological conditions, a network of interconnected signals serves to control and coordinate hypertrophic and atrophic messages, culminating in a delicate balance between muscle protein synthesis and proteolysis. Loss of skeletal muscle mass, termed "atrophy", is a diagnostic feature of cachexia seen in settings of cancer, heart disease, chronic obstructive pulmonary disease, kidney disease, and burns. Cachexia increases the likelihood of death from these already serious diseases. Recent studies have further defined the pathways leading to gain and loss of skeletal muscle as well as the signaling events that induce differentiation and post-injury regeneration, which are also essential for the maintenance of skeletal muscle mass. In this review, we summarize and discuss the relevant recent literature demonstrating these previously undiscovered mediators governing anabolism and catabolism of skeletal muscle.
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Affiliation(s)
- Marc A Egerman
- Novartis Institutes for Biomedical Research , Cambridge, MA , USA
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24
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Kuo T, Harris CA, Wang JC. Metabolic functions of glucocorticoid receptor in skeletal muscle. Mol Cell Endocrinol 2013; 380:79-88. [PMID: 23523565 PMCID: PMC4893778 DOI: 10.1016/j.mce.2013.03.003] [Citation(s) in RCA: 149] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Revised: 03/01/2013] [Accepted: 03/03/2013] [Indexed: 12/12/2022]
Abstract
Glucocorticoids (GCs) exert key metabolic influences on skeletal muscle. GCs increase protein degradation and decrease protein synthesis. The released amino acids are mobilized from skeletal muscle to liver, where they serve as substrates for hepatic gluconeogenesis. This metabolic response is critical for mammals' survival under stressful conditions, such as fasting and starvation. GCs suppress insulin-stimulated glucose uptake and utilization and glycogen synthesis, and play a permissive role for catecholamine-induced glycogenolysis, thus preserving the level of circulating glucose, the major energy source for the brain. However, chronic or excess exposure of GCs can induce muscle atrophy and insulin resistance. GCs convey their signal mainly through the intracellular glucocorticoid receptor (GR). While GR can act through different mechanisms, one of its major actions is to regulate the transcription of its primary target genes through genomic glucocorticoid response elements (GREs) by directly binding to DNA or tethering onto other DNA-binding transcription factors. These GR primary targets trigger physiological and pathological responses of GCs. Much progress has been made to understand how GCs regulate protein and glucose metabolism. In this review, we will discuss how GR primary target genes confer metabolic functions of GCs, and the mechanisms governing the transcriptional regulation of these targets. Comprehending these processes not only contributes to the fundamental understanding of mammalian physiology, but also will provide invaluable insight for improved GC therapeutics.
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Affiliation(s)
- Taiyi Kuo
- Department of Nutritional Science & Toxicology, University of California at Berkeley, Berkeley, CA 94720, United States
- Graduate Program of Endocrinology, University of California at Berkeley, Berkeley, CA 94720, United States
| | - Charles A. Harris
- Gladstone Institute of Cardiovascular Disease, San Francisco, CA 94158, United States
- Department of Medicine, University of California at San Francisco, San Francisco, CA 94143, United States
| | - Jen-Chywan Wang
- Department of Nutritional Science & Toxicology, University of California at Berkeley, Berkeley, CA 94720, United States
- Graduate Program of Endocrinology, University of California at Berkeley, Berkeley, CA 94720, United States
- Corresponding author. Address: Department of Nutritional Science and Toxicology, 315 Morgan Hall, University of California at Berkeley, Berkeley, CA 94720-3104, United States. Tel.: +1 510 643 1039. (J.-C. Wang)
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25
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Yogev O, Williams VC, Hinits Y, Hughes SM. eIF4EBP3L acts as a gatekeeper of TORC1 in activity-dependent muscle growth by specifically regulating Mef2ca translational initiation. PLoS Biol 2013; 11:e1001679. [PMID: 24143132 PMCID: PMC3797031 DOI: 10.1371/journal.pbio.1001679] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 09/04/2013] [Indexed: 01/12/2023] Open
Abstract
Muscle activity promotes muscle growth through the TOR-4EBP pathway by controlling the translation of specific mRNAs, including Mef2ca, a muscle transcription factor required for normal growth. Muscle fiber size is activity-dependent and clinically important in ageing, bed-rest, and cachexia, where muscle weakening leads to disability, prolonged recovery times, and increased costs. Inactivity causes muscle wasting by triggering protein degradation and may simultaneously prevent protein synthesis. During development, muscle tissue grows by several mechanisms, including hypertrophy of existing fibers. As in other tissues, the TOR pathway plays a key role in promoting muscle protein synthesis by inhibition of eIF4EBPs (eukaryotic Initiation Factor 4E Binding Proteins), regulators of the translational initiation. Here, we tested the role of TOR-eIF4EBP in a novel zebrafish muscle inactivity model. Inactivity triggered up-regulation of eIF4EBP3L (a zebrafish homolog of eIF4EBP3) and diminished myosin and actin content, myofibrilogenesis, and fiber growth. The changes were accompanied by preferential reduction of the muscle transcription factor Mef2c, relative to Myod and Vinculin. Polysomal fractionation showed that Mef2c decrease was due to reduced translation of mef2ca mRNA. Loss of Mef2ca function reduced normal muscle growth and diminished the reduction in growth caused by inactivity. We identify eIF4EBP3L as a key regulator of Mef2c translation and protein level following inactivity; blocking eIF4EBP3L function increased Mef2ca translation. Such blockade also prevented the decline in mef2ca translation and level of Mef2c and slow myosin heavy chain proteins caused by inactivity. Conversely, overexpression of active eIF4EBP3L mimicked inactivity by decreasing the proportion of mef2ca mRNA in polysomes, the levels of Mef2c and slow myosin heavy chain, and myofibril content. Inhibiting the TOR pathway without the increase in eIF4EBP3L had a lesser effect on myofibrilogenesis and muscle size. These findings identify eIF4EBP3L as a key TOR-dependent regulator of muscle fiber size in response to activity. We suggest that by selectively inhibiting translational initiation of mef2ca and other mRNAs, eIF4EBP3L reprograms the translational profile of muscle, enabling it to adjust to new environmental conditions. Most genes are transcribed into mRNA and then translated into proteins that function in various cellular processes. Initiation of mRNA translation is thus a fundamental control point in gene expression. Working in a zebrafish model, we have found that muscle activity (or inactivity) can differentially regulate the translation of specific mRNAs and thereby control the growth of skeletal muscle. Emerging evidence suggests that control of translational initiation of particular mRNAs by an intracellular signaling pathway acting through TORC1 is a major regulator of cell growth and function. We show here that muscle activity both activates the TORC1 pathway and suppresses the expression of a downstream TORC1 target—the translational inhibitor eIF4EBP3L. This removes a brake on translation of certain mRNAs. Conversely, we show that muscle inactivity can up-regulate this translational inhibitor, thereby causing reduced translation of these mRNAs. One of the mRNAs targeted in this manner by eIF4EBP3L is Mef2ca, which encodes a transcription factor that promotes assembly of muscle contractile apparatus. Our work thus reveals a mechanism by which muscle growth can be differentially influenced depending on the context of muscle activity (or lack thereof). If this pathway operates in people, it may help explain how exercise regulates muscle growth and performance.
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Affiliation(s)
- Orli Yogev
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
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26
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Identification of Functional Regulatory Residues of the β -Lactam Inducible Penicillin Binding Protein in Methicillin-Resistant Staphylococcus aureus. CHEMOTHERAPY RESEARCH AND PRACTICE 2013; 2013:614670. [PMID: 23984067 PMCID: PMC3745919 DOI: 10.1155/2013/614670] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 06/19/2013] [Accepted: 07/03/2013] [Indexed: 11/30/2022]
Abstract
Resistance to methicillin by Staphylococcus aureus is a persistent clinical problem worldwide. A mechanism for resistance has been proposed in which methicillin resistant Staphylococcus aureus (MRSA) isolates acquired a new protein called β-lactam inducible penicillin binding protein (PBP-2′). The PBP-2′ functions by substituting other penicillin binding proteins which have been inhibited by β-lactam antibiotics. Presently, there is no structural and regulatory information on PBP-2′ protein. We conducted a complete structural and functional regulatory analysis of PBP-2′ protein. Our analysis revealed that the PBP-2′ is very stable with more hydrophilic amino acids expressing antigenic sites. PBP-2′ has three striking regulatory points constituted by first penicillin binding site at Ser25, second penicillin binding site at Ser405, and finally a single metallic ligand binding site at Glu657 which binds to Zn2+ ions. This report highlights structural features of PBP-2′ that can serve as targets for developing new chemotherapeutic agents and conducting site direct mutagenesis experiments.
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Cho KS, Joo SH, Choi CS, Kim KC, Ko HM, Park JH, Kim P, Hur J, Lee SH, Bahn GH, Ryu JH, Lee J, Han SH, Kwon KJ, Shin CY. Glucose deprivation reversibly down-regulates tissue plasminogen activator via proteasomal degradation in rat primary astrocytes. Life Sci 2013; 92:929-37. [DOI: 10.1016/j.lfs.2013.03.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 03/12/2013] [Accepted: 03/20/2013] [Indexed: 11/30/2022]
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Kammoun M, Picard B, Henry-Berger J, Cassar-Malek I. A network-based approach for predicting Hsp27 knock-out targets in mouse skeletal muscles. Comput Struct Biotechnol J 2013; 6:e201303008. [PMID: 24688716 PMCID: PMC3962151 DOI: 10.5936/csbj.201303008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 07/04/2013] [Accepted: 07/10/2013] [Indexed: 12/16/2022] Open
Abstract
Thanks to genomics, we have previously identified markers of beef tenderness, and computed a bioinformatic analysis that enabled us to build an interactome in which we found Hsp27 at a crucial node. Here, we have used a network-based approach for understanding the contribution of Hsp27 to tenderness through the prediction of its interactors related to tenderness. We have revealed the direct interactors of Hsp27. The predicted partners of Hsp27 included proteins involved in different functions, e.g. members of Hsp families (Hsp20, Cryab, Hsp70a1a, and Hsp90aa1), regulators of apoptosis (Fas, Chuk, and caspase-3), translation factors (Eif4E, and Eif4G1), cytoskeletal proteins (Desmin) and antioxidants (Sod1). The abundances of 15 proteins were quantified by Western blotting in two muscles of HspB1-null mice and their controls. We observed changes in the amount of most of the Hsp27 predicted targets in mice devoid of Hsp27 mainly in the most oxidative muscle. Our study demonstrates the functional links between Hsp27 and its predicted targets. It suggests that Hsp status, apoptotic processes and protection against oxidative stress are crucial for post-mortem muscle metabolism, subsequent proteolysis, and therefore for beef tenderness.
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Affiliation(s)
- Malek Kammoun
- INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, France
- Clermont University, VetAgro Sup, UMR1213 Herbivores, BP 10448, F-63000, Clermont-Ferrand, France
| | - Brigitte Picard
- INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, France
- Clermont University, VetAgro Sup, UMR1213 Herbivores, BP 10448, F-63000, Clermont-Ferrand, France
| | | | - Isabelle Cassar-Malek
- INRA, UMR1213 Herbivores, F-63122 Saint-Genès-Champanelle, France
- Clermont University, VetAgro Sup, UMR1213 Herbivores, BP 10448, F-63000, Clermont-Ferrand, France
- Corresponding author: E-mail address: (Isabelle Cassar-Malek)
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Badura M, Braunstein S, Zavadil J, Schneider RJ. DNA damage and eIF4G1 in breast cancer cells reprogram translation for survival and DNA repair mRNAs. Proc Natl Acad Sci U S A 2012; 109:18767-72. [PMID: 23112151 PMCID: PMC3503184 DOI: 10.1073/pnas.1203853109] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The cellular response to DNA damage is mediated through multiple pathways that regulate and coordinate DNA repair, cell cycle arrest, and cell death. We show that the DNA damage response (DDR) induced by ionizing radiation (IR) is coordinated in breast cancer cells by selective mRNA translation mediated by high levels of translation initiation factor eIF4G1 (eukaryotic initiation factor 4γ1). Increased expression of eIF4G1, common in breast cancers, was found to selectively increase translation of mRNAs involved in cell survival and the DDR, preventing autophagy and apoptosis [Survivin, hypoxia inducible factor 1α (HIF1α), X-linked inhibitor of apoptosis (XIAP)], promoting cell cycle arrest [growth arrest and DNA damage protein 45a (GADD45a), protein 53 (p53), ATR-interacting protein (ATRIP), Check point kinase 1 (Chk1)] and DNA repair [p53 binding protein 1 (53BP1), breast cancer associated proteins 1, 2 (BRCA1/2), Poly-ADP ribose polymerase (PARP), replication factor c2-5 (Rfc2-5), ataxia telangiectasia mutated gene 1 (ATM), meiotic recombination protein 11 (MRE-11), and others]. Reduced expression of eIF4G1, but not its homolog eIF4G2, greatly sensitizes cells to DNA damage by IR, induces cell death by both apoptosis and autophagy, and significantly delays resolution of DNA damage foci with little reduction of overall protein synthesis. Although some mRNAs selectively translated by higher levels of eIF4G1 were found to use internal ribosome entry site (IRES)-mediated alternate translation, most do not. The latter group shows significantly reduced dependence on eIF4E for translation, facilitated by an enhanced requirement for eIF4G1. Increased expression of eIF4G1 therefore promotes specialized translation of survival, growth arrest, and DDR mRNAs that are important in cell survival and DNA repair following genotoxic DNA damage.
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Affiliation(s)
| | | | | | - Robert J. Schneider
- Department of Microbiology
- NYU Cancer Institute, and
- Department of Radiation Oncology, New York University School of Medicine, New York, NY 10016
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30
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Glass DJ, VanHook AM. Science Signaling
Podcast: 27 March 2012. Sci Signal 2012. [DOI: 10.1126/scisignal.2003003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Regulated protein synthesis and degradation mediate skeletal muscle homeostasis.
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Affiliation(s)
- David J. Glass
- Novartis Institutes for Biomedical Research, 100 Technology Square, Cambridge, MA 02139, USA
| | - Annalisa M. VanHook
- Web Editor, Science Signaling, American Association for the Advancement of Science, 1200 New York Avenue, NW, Washington, DC 20005, USA
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31
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Cell signalling: Building strong muscles. Nat Rev Mol Cell Biol 2012; 13:206. [PMID: 22414895 DOI: 10.1038/nrm3317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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