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Magg V, Manetto A, Kopp K, Wu CC, Naghizadeh M, Lindner D, Eke L, Welsch J, Kallenberger SM, Schott J, Haucke V, Locker N, Stoecklin G, Ruggieri A. Turnover of PPP1R15A mRNA encoding GADD34 controls responsiveness and adaptation to cellular stress. Cell Rep 2024; 43:114069. [PMID: 38602876 DOI: 10.1016/j.celrep.2024.114069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 01/25/2024] [Accepted: 03/21/2024] [Indexed: 04/13/2024] Open
Abstract
The integrated stress response (ISR) is a key cellular signaling pathway activated by environmental alterations that represses protein synthesis to restore homeostasis. To prevent sustained damage, the ISR is counteracted by the upregulation of growth arrest and DNA damage-inducible 34 (GADD34), a stress-induced regulatory subunit of protein phosphatase 1 that mediates translation reactivation and stress recovery. Here, we uncover a novel ISR regulatory mechanism that post-transcriptionally controls the stability of PPP1R15A mRNA encoding GADD34. We establish that the 3' untranslated region of PPP1R15A mRNA contains an active AU-rich element (ARE) recognized by proteins of the ZFP36 family, promoting its rapid decay under normal conditions and stabilization for efficient expression of GADD34 in response to stress. We identify the tight temporal control of PPP1R15A mRNA turnover as a component of the transient ISR memory, which sets the threshold for cellular responsiveness and mediates adaptation to repeated stress conditions.
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Affiliation(s)
- Vera Magg
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany
| | - Alessandro Manetto
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany
| | - Katja Kopp
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany
| | - Chia Ching Wu
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany
| | - Mohsen Naghizadeh
- Heidelberg University, Medical Faculty Mannheim, Division of Biochemistry, Mannheim Institute for Innate Immunoscience (MI3) and Mannheim Cancer Center (MCC), 68167 Mannheim, Germany
| | - Doris Lindner
- Heidelberg University, Medical Faculty Mannheim, Division of Biochemistry, Mannheim Institute for Innate Immunoscience (MI3) and Mannheim Cancer Center (MCC), 68167 Mannheim, Germany
| | - Lucy Eke
- Faculty of Health and Medical Sciences, School of Biosciences and Medicine, University of Surrey, Guildford, UK
| | - Julia Welsch
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany
| | - Stefan M Kallenberger
- Digital Health Center, Berlin Institute of Health (BIH) and Charité, 10178 Berlin, Germany; Medical Oncology, National Center for Tumor Diseases, Heidelberg University, 69120 Heidelberg, Germany
| | - Johanna Schott
- Heidelberg University, Medical Faculty Mannheim, Division of Biochemistry, Mannheim Institute for Innate Immunoscience (MI3) and Mannheim Cancer Center (MCC), 68167 Mannheim, Germany
| | - Volker Haucke
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie, 13125 Berlin, Germany; Freie Universität Berlin, Faculty of Biology, Chemistry, and Pharmacy, 14195 Berlin, Germany
| | - Nicolas Locker
- Faculty of Health and Medical Sciences, School of Biosciences and Medicine, University of Surrey, Guildford, UK; The Pirbright Institute, GU24 0NF Pirbright, UK
| | - Georg Stoecklin
- Heidelberg University, Medical Faculty Mannheim, Division of Biochemistry, Mannheim Institute for Innate Immunoscience (MI3) and Mannheim Cancer Center (MCC), 68167 Mannheim, Germany; Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany.
| | - Alessia Ruggieri
- Heidelberg University, Medical Faculty Heidelberg, Department of Infectious Diseases, Molecular Virology, Center for Integrative Infectious Disease Research, 69120 Heidelberg, Germany.
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Lu F, Yao LP, Gao DD, Alinejad T, Jiang XQ, Wu Q, Zhai QC, Liu M, Zhu SM, Qian MX, Xu LF, Chen CS, Zhang F. MicroRNA-377-3p exacerbates chronic obstructive pulmonary disease through suppressing ZFP36L1 expression and inducing lung fibroblast senescence. Respir Res 2024; 25:67. [PMID: 38317146 PMCID: PMC10840170 DOI: 10.1186/s12931-024-02696-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 01/21/2024] [Indexed: 02/07/2024] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a leading aging related cause of global mortality. Small airway narrowing is recognized as an early and significant factor for COPD development. Senescent fibroblasts were observed to accumulate in lung of COPD patients and promote COPD progression through aberrant extracellular matrix (ECM) deposition and senescence-associated secretory phenotype (SASP). On the basis of our previous study, we further investigated the the causes for the increased levels of miR-377-3p in the blood of COPD patients, as well as its regulatory function in the pathological progression of COPD. We found that the majority of up-regulated miR-377-3p was localized in lung fibroblasts. Inhibition of miR-377-3p improved chronic smoking-induced COPD in mice. Mechanistically, miR-377-3p promoted senescence of lung fibroblasts, while knockdown of miR-377-3p attenuated bleomycin-induced senescence in lung fibroblasts. We also identified ZFP36L1 as a direct target for miR-377-3p that likely mediated its pro senescence activity in lung fibroblasts. Our data reveal that miR-377-3p is crucial for COPD pathogenesis, and may serve as a potential target for COPD therapy.
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Affiliation(s)
- Fang Lu
- Department of Respiratory and Critical Care, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Li-Peng Yao
- Wenzhou Medical University, Wenzhou, 325035, China
- Ningbo College of Health Sciences, Ningbo, 315000, China
| | - Dan-Dan Gao
- Wenzhou Medical University, Wenzhou, 325035, China
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Tahereh Alinejad
- The Key Laboratory of Interventional Pulmonology of Zhejiang Province, Department of Pulmonary and Critical Care Medicine, Centre of Precision Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, China
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision, and Brain Health), School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, 325015, China
| | - Xin-Qing Jiang
- Zhejiang Chinese Medical University the 2 nd Clinical Medical College, Hangzhou, 310053, China
| | - Qi Wu
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Qiao-Cheng Zhai
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Ming Liu
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Sheng-Mei Zhu
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
| | - Mao-Xiang Qian
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China
- Institute of Pediatrics, Department of Hematology and Oncology, Institutes of Biomedical Sciences, National Children's Medical Center, Children's Hospital of Fudan University, Fudan University, Shanghai, 200032, China
| | - Li-Feng Xu
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China.
| | - Cheng-Shui Chen
- Department of Respiratory and Critical Care, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China.
- The Key Laboratory of Interventional Pulmonology of Zhejiang Province, Department of Pulmonary and Critical Care Medicine, Centre of Precision Medicine, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325015, China.
| | - Feng Zhang
- Joint Innovation Center for Engineering in Medicine, Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou, 324000, China.
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3
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Salvato I, Ricciardi L, Nucera F, Nigro A, Dal Col J, Monaco F, Caramori G, Stellato C. RNA-Binding Proteins as a Molecular Link between COPD and Lung Cancer. COPD 2023; 20:18-30. [PMID: 36655862 DOI: 10.1080/15412555.2022.2107500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Chronic obstructive pulmonary disease (COPD) represents an independent risk factor for lung cancer development. Accelerated cell senescence, induced by oxidative stress and inflammation, is a common pathogenic determinant of both COPD and lung cancer. The post transcriptional regulation of genes involved in these processes is finely regulated by RNA-binding proteins (RBPs), which regulate mRNA turnover, subcellular localization, splicing and translation. Multiple pro-inflammatory mediators (including cytokines, chemokines, proteins, growth factors and others), responsible of lung microenvironment alteration, are regulated by RBPs. Several mouse models have shown the implication of RBPs in multiple mechanisms that sustain chronic inflammation and neoplastic transformation. However, further studies are required to clarify the role of RBPs in the pathogenic mechanisms shared by lung cancer and COPD, in order to identify novel biomarkers and therapeutic targets. This review will therefore focus on the studies collectively indicating the role of RBPs in oxidative stress and chronic inflammation as common pathogenic mechanisms shared by lung cancer and COPD.
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Affiliation(s)
- Ilaria Salvato
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Italy
| | - Luca Ricciardi
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Italy
| | - Francesco Nucera
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Italy
| | - Annunziata Nigro
- Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, Salerno, Italy
| | - Jessica Dal Col
- Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, Salerno, Italy
| | - Francesco Monaco
- Chirurgia Toracica, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Italy
| | - Gaetano Caramori
- Pneumologia, Dipartimento di Scienze Biomediche, Odontoiatriche e delle Immagini Morfologiche e Funzionali (BIOMORF), Università degli Studi di Messina, Italy
| | - Cristiana Stellato
- Department of Medicine, Surgery and Dentistry "Scuola Medica Salernitana", University of Salerno, Salerno, Italy
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Baccianti F, Masson C, Delecluse S, Li Z, Poirey R, Delecluse HJ. Epstein-Barr virus infectious particles initiate B cell transformation and modulate cytokine response. mBio 2023; 14:e0178423. [PMID: 37830871 PMCID: PMC10653912 DOI: 10.1128/mbio.01784-23] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 08/14/2023] [Indexed: 10/14/2023] Open
Abstract
IMPORTANCE The Epstein-Barr virus efficiently infects and transforms B lymphocytes. During this process, infectious viral particles transport the viral genome to the nucleus of target cells. We show here that these complex viral structures serve additional crucial roles by activating transcription of the transforming genes encoded by the virus. We show that components of the infectious particle sequentially activate proinflammatory B lymphocyte signaling pathways that, in turn, activate viral gene expression but also cause cytokine release. However, virus infection activates expression of ZFP36L1, an RNA-binding stress protein that limits the length and the intensity of the cytokine response. Thus, the infectious particles can activate viral gene expression and initiate cellular transformation at the price of a limited immune response.
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Affiliation(s)
- Francesco Baccianti
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
| | - Charlène Masson
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
| | - Susanne Delecluse
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
- Nierenzentrum Heidelberg e.V., Heidelberg, Germany
- Deutsches Zentrum für Infektionsforschung (DZIF), Braunschweig, Germany
| | - Zhe Li
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
| | - Remy Poirey
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
| | - Henri-Jacques Delecluse
- Pathogenesis of Virus Associated Tumors, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Unit U1074, INSERM, Heidelberg, Germany
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5
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Stehn JR, Floyd SR, Wilker EW, Reinhardt HC, Clarke SM, Huang Q, Polakiewicz RD, Sonenberg N, Kong YW, Yaffe MB. MAPKAP Kinase-2 phosphorylation of PABPC1 controls its interaction with 14-3-3 proteins after DNA damage: A combined kinase and protein array approach. Front Mol Biosci 2023; 10:1148933. [PMID: 37091863 PMCID: PMC10117672 DOI: 10.3389/fmolb.2023.1148933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 03/23/2023] [Indexed: 04/08/2023] Open
Abstract
14-3-3 proteins play critical roles in controlling multiple aspects of the cellular response to stress and DNA damage including regulation of metabolism, cell cycle progression, cell migration, and apoptotic cell death by binding to protein substrates of basophilic protein kinases following their phosphorylation on specific serine/threonine residues. Although over 200 mammalian proteins that bind to 14-3-3 have been identified, largely through proteomic studies, in many cases the relevant protein kinase responsible for conferring 14-3-3-binding to these proteins is not known. To facilitate the identification of kinase-specific 14-3-3 clients, we developed a biochemical approach using high-density protein filter arrays and identified the translational regulatory molecule PABPC1 as a substrate for Chk1 and MAPKAP Kinase-2 (MK2) in vitro, and for MK2 in vivo, whose phosphorylation results in 14-3-3-binding. We identify Ser-470 on PABPC1 within the linker region connecting the RRM domains to the PABC domain as the critical 14-3-3-binding site, and demonstrate that loss of PABPC1 binding to 14-3-3 results in increased cell proliferation and decreased cell death in response to UV-induced DNA damage.
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Affiliation(s)
- Justine R. Stehn
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Scott R. Floyd
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Erik W. Wilker
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - H. Christian Reinhardt
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Scott M. Clarke
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Qiuying Huang
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
| | | | - Nahum Sonenberg
- Rosalind and Morris Goodman Cancer Centre, Department of Biochemistry, McGill University, Montreal, QC, Canada
| | - Yi Wen Kong
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
- Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA, United States
| | - Michael B. Yaffe
- David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, United States
- Center for Precision Cancer Medicine, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, United States
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
- Divisions of Surgical Oncology, Trauma, and Surgical Critical Care, Beth Israel Deaconess Medical Center, Department of Surgery, Harvard Medical School, Boston, MA, United States
- Surgical Oncology Program, National Cancer Institute, National Institutes of Health, Bethesda, MD, United States
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6
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Dan Y, Radic N, Gay M, Fernández-Torras A, Arauz G, Vilaseca M, Aloy P, Canovas B, Nebreda A. Characterization of p38α signaling networks in cancer cells using quantitative proteomics and phosphoproteomics. Mol Cell Proteomics 2023; 22:100527. [PMID: 36894123 PMCID: PMC10105487 DOI: 10.1016/j.mcpro.2023.100527] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 03/01/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023] Open
Abstract
p38α (encoded by MAPK14) is a protein kinase that regulates cellular responses to almost all types of environmental and intracellular stresses. Upon activation, p38α phosphorylates many substrates both in the cytoplasm and nucleus, allowing this pathway to regulate a wide variety of cellular processes. While the role of p38α in the stress response has been widely investigated, its implication in cell homeostasis is less understood. To investigate the signaling networks regulated by p38α in proliferating cancer cells, we performed quantitative proteomic and phosphoproteomic analyses in breast cancer cells in which this pathway had been either genetically targeted or chemically inhibited. Our study identified with high confidence 35 proteins and 82 phosphoproteins (114 phosphosites) that are modulated by p38α, and highlighted the implication of various protein kinases, including MK2 and mTOR, in the p38α-regulated signaling networks. Moreover, functional analyses revealed an important contribution of p38α to the regulation of cell adhesion, DNA replication and RNA metabolism. Indeed, we provide experimental evidence supporting that p38α facilitates cancer cell adhesion, and showed that this p38α function is likely mediated by the modulation of the adaptor protein ArgBP2. Collectively, our results illustrate the complexity of the p38α regulated signaling networks, provide valuable information on p38α-dependent phosphorylation events in cancer cells, and document a mechanism by which p38α can regulate cell adhesion.
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Affiliation(s)
- Yuzhen Dan
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Nevenka Radic
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Marina Gay
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Adrià Fernández-Torras
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Gianluca Arauz
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Marta Vilaseca
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Patrick Aloy
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain; ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain
| | - Begoña Canovas
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - AngelR Nebreda
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028 Barcelona, Spain; ICREA, Pg. Lluís Companys 23, 08010 Barcelona, Spain.
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7
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Kaposi's sarcoma-associated herpesvirus (KSHV) utilizes the NDP52/CALCOCO2 selective autophagy receptor to disassemble processing bodies. PLoS Pathog 2023; 19:e1011080. [PMID: 36634147 PMCID: PMC9876383 DOI: 10.1371/journal.ppat.1011080] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 01/25/2023] [Accepted: 12/22/2022] [Indexed: 01/13/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) causes the inflammatory and angiogenic endothelial cell neoplasm, Kaposi's sarcoma (KS). We previously demonstrated that the KSHV Kaposin B (KapB) protein promotes inflammation via the disassembly of cytoplasmic ribonucleoprotein granules called processing bodies (PBs). PBs modify gene expression by silencing or degrading labile messenger RNAs (mRNAs), including many transcripts that encode inflammatory or angiogenic proteins associated with KS disease. Although our work implicated PB disassembly as one of the causes of inflammation during KSHV infection, the precise mechanism used by KapB to elicit PB disassembly was unclear. Here we reveal a new connection between the degradative process of autophagy and PB disassembly. We show that both latent KSHV infection and KapB expression enhanced autophagic flux via phosphorylation of the autophagy regulatory protein, Beclin. KapB was necessary for this effect, as infection with a recombinant virus that does not express the KapB protein did not induce Beclin phosphorylation or autophagic flux. Moreover, we showed that PB disassembly mediated by KSHV or KapB, depended on autophagy genes and the selective autophagy receptor NDP52/CALCOCO2 and that the PB scaffolding protein, Pat1b, co-immunoprecipitated with NDP52. These studies reveal a new role for autophagy and the selective autophagy receptor NDP52 in promoting PB turnover and the concomitant synthesis of inflammatory molecules during KSHV infection.
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8
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Park E, Yang CR, Raghuram V, Deshpande V, Datta A, Poll BG, Leo KT, Kikuchi H, Chen L, Chou CL, Knepper MA. Data resource: vasopressin-regulated protein phosphorylation sites in the collecting duct. Am J Physiol Renal Physiol 2023; 324:F43-F55. [PMID: 36264882 PMCID: PMC9762968 DOI: 10.1152/ajprenal.00229.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 10/04/2022] [Accepted: 10/17/2022] [Indexed: 02/04/2023] Open
Abstract
Vasopressin controls renal water excretion through actions to regulate aquaporin-2 (AQP2) trafficking, transcription, and degradation. These actions are in part dependent on vasopressin-induced phosphorylation changes in collecting duct cells. Although most efforts have focused on the phosphorylation of AQP2 itself, phosphoproteomic studies have identified many vasopressin-regulated phosphorylation sites in proteins other than AQP2. The goal of this bioinformatics-based review is to create a compendium of vasopressin-regulated phosphorylation sites with a focus on those that are seen in both native rat inner medullary collecting ducts and cultured collecting duct cells from the mouse (mpkCCD), arguing that these sites are the best candidates for roles in AQP2 regulation. This analysis identified 51 vasopressin-regulated phosphorylation sites in 45 proteins. We provide resource web pages at https://esbl.nhlbi.nih.gov/Databases/AVP-Phos/ and https://esbl.nhlbi.nih.gov/AVP-Network/, listing the phosphorylation sites and describing annotated functions of each of the vasopressin-targeted phosphoproteins. Among these sites are 23 consensus protein kinase A (PKA) sites that are increased in response to vasopressin, consistent with a central role for PKA in vasopressin signaling. The remaining sites are predicted to be phosphorylated by other kinases, most notably ERK1/2, which accounts for decreased phosphorylation at sites with a X-p(S/T)-P-X motif. Additional protein kinases that undergo vasopressin-induced changes in phosphorylation are Camkk2, Cdk18, Erbb3, Mink1, and Src, which also may be activated directly or indirectly by PKA. The regulated phosphoproteins are mapped to processes that hypothetically can account for vasopressin-mediated control of AQP2 trafficking, cytoskeletal alterations, and Aqp2 gene expression, providing grist for future studies.NEW & NOTEWORTHY Vasopressin regulates renal water excretion through control of the aquaporin-2 water channel in collecting duct cells. Studies of vasopressin-induced protein phosphorylation have focused mainly on the phosphorylation of aquaporin-2. This study describes 44 phosphoproteins other than aquaporin-2 that undergo vasopressin-mediated phosphorylation changes and summarizes potential physiological roles of each.
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Affiliation(s)
- Euijung Park
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Chin-Rang Yang
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Viswanathan Raghuram
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Venkatesh Deshpande
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Arnab Datta
- Laboratory of Translational Neuroscience, Division of Neuroscience, Yenepoya Research Center, Yenepoya (Deemed to be University), Mangalore, India
| | - Brian G Poll
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Kirby T Leo
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Hiroaki Kikuchi
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Lihe Chen
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Chung-Lin Chou
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
| | - Mark A Knepper
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
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9
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Carreño A, Lykke-Andersen J. The Conserved CNOT1 Interaction Motif of Tristetraprolin Regulates ARE-mRNA Decay Independently of the p38 MAPK-MK2 Kinase Pathway. Mol Cell Biol 2022; 42:e0005522. [PMID: 35920669 PMCID: PMC9476947 DOI: 10.1128/mcb.00055-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The regulation of the mRNA decay activator Tristetraprolin (TTP) by the p38 mitogen-activated protein kinase (MAPK) pathway during the mammalian inflammatory response represents a paradigm for the control of mRNA turnover by signaling. TTP activity is regulated through multiple phosphorylation sites, including an evolutionary conserved serine in its CNOT1 Interacting Motif (CIM) whose phosphorylation disrupts an interaction with CNOT1 of the CCR4-NOT deadenylase complex. Here we present evidence that the TTP CIM recruits the CCR4-NOT deadenylase complex and activates mRNA degradation cooperatively with the conserved tryptophan residues of TTP, previously identified to interact with CNOT9. Surprisingly, the TTP CIM remains unphosphorylated and capable of promoting association with the CCR4-NOT complex and mRNA decay upon activation of p38-MAPK-activated kinase MK2, a well-established regulator of TTP activity. The CIM is instead targeted by other kinases including PKCα. These observations suggest that signaling pathways regulate TTP activity in a cooperative manner and that the p38 MAPK-MK2 kinase pathway relies on the activation of additional kinase pathway(s) to fully control TTP function.
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Affiliation(s)
- Alberto Carreño
- Department of Molecular Biology, School of Biological Sciences, University of California San Diego, La Jolla, California, USA
| | - Jens Lykke-Andersen
- Department of Molecular Biology, School of Biological Sciences, University of California San Diego, La Jolla, California, USA
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10
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Abstract
Mitogen-activated protein kinase (MAPK)-activated protein kinases (MAPKAPKs) are defined by their exclusive activation by MAPKs. They can be activated by classical and atypical MAPKs that have been stimulated by mitogens and various stresses. Genetic deletions of MAPKAPKs and availability of highly specific small-molecule inhibitors have continuously increased our functional understanding of these kinases. MAPKAPKs cooperate in the regulation of gene expression at the level of transcription; RNA processing, export, and stability; and protein synthesis. The diversity of stimuli for MAPK activation, the cross talk between the different MAPKs and MAPKAPKs, and the specific substrate pattern of MAPKAPKs orchestrate immediate-early and inflammatory responses in space and time and ensure proper control of cell growth, differentiation, and cell behavior. Hence, MAPKAPKs are promising targets for cancer therapy and treatments for conditions of acute and chronic inflammation, such as cytokine storms and rheumatoid arthritis. Expected final online publication date for the Annual Review of Biochemistry, Volume 91 is June 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Natalia Ronkina
- Institute of Cell Biochemistry, Hannover Medical School, Hannover, Germany;
| | - Matthias Gaestel
- Institute of Cell Biochemistry, Hannover Medical School, Hannover, Germany;
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11
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Suzuki T, Hoshina M, Nishijima S, Hoshina N, Kikuguchi C, Tomohiro T, Fukao A, Fujiwara T, Yamamoto T. Regulation of CCR4-NOT complex deadenylase activity and cellular responses by MK2-dependent phosphorylation of CNOT2. RNA Biol 2022; 19:234-246. [PMID: 35129087 PMCID: PMC8820811 DOI: 10.1080/15476286.2021.2021676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
CCR4-NOT complex-mediated mRNA deadenylation serves critical functions in multiple biological processes, yet how this activity is regulated is not fully understood. Here, we show that osmotic stress induces MAPKAPK-2 (MK2)-mediated phosphorylation of CNOT2. Programmed cell death is greatly enhanced by osmotic stress in CNOT2-depleted cells, indicating that CNOT2 is responsible for stress resistance of cells. Although wild-type (WT) and non-phosphorylatable CNOT2 mutants reverse this sensitivity, a phosphomimetic form of CNOT2, in which serine at the phosphorylation site is replaced with glutamate, does not have this function. We also show that mRNAs have elongated poly(A) tails in CNOT2-depleted cells and that introduction of CNOT2 WT or a non-phosphorylatable mutant, but not phosphomimetic CNOT2, renders their poly(A) tail lengths comparable to those in control HeLa cells. Consistent with this, the CCR4-NOT complex containing phosphomimetic CNOT2 exhibits less deadenylase activity than that containing CNOT2 WT. These data suggest that CCR4-NOT complex deadenylase activity is regulated by post-translational modification, yielding dynamic control of mRNA deadenylation.
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Affiliation(s)
- Toru Suzuki
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, Riken, Yokohama, Japan
| | - Miyuki Hoshina
- Cell Signal Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Japan
| | - Saori Nishijima
- Cell Signal Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Japan
| | - Naosuke Hoshina
- Cell Signal Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Japan
| | - Chisato Kikuguchi
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, Riken, Yokohama, Japan
| | - Takumi Tomohiro
- Laboratory of Biochemistry, Kindai University, Higashi-Osaka, Japan
| | - Akira Fukao
- Laboratory of Biochemistry, Kindai University, Higashi-Osaka, Japan
| | | | - Tadashi Yamamoto
- Cell Signal Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Japan
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12
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Matsuura Y, Noguchi A, Sakai S, Yokota N, Kawahara H. Nuclear accumulation of ZFP36L1 is cell cycle-dependent and determined by a C-terminal serine-rich cluster. J Biochem 2021; 168:477-489. [PMID: 32687160 DOI: 10.1093/jb/mvaa072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 05/26/2020] [Indexed: 11/14/2022] Open
Abstract
ZFP36L1 is an RNA-binding protein responsible for mRNA decay in the cytoplasm. ZFP36L1 has also been suggested as a nuclear-cytoplasmic shuttling protein because it contains a potential nuclear localization signal and a nuclear export signal. However, it remains unclear how the nuclear localization of ZFP36L1 is controlled. In this study, we provide evidence that the nuclear accumulation of ZFP36L1 protein is modulated in a cell cycle-dependent manner. ZFP36L1 protein accumulation in fractionated nuclei was particularly prominent in cells arrested at G1-/S-phase boundary, while it was downregulated in S-phase cells, and eventually disappeared in G2-phase nuclei. Moreover, forced nuclear targeting of ZFP36L1 revealed marked downregulation of this protein in S- and G2-phase cells, suggesting that ZFP36L1 can be eliminated in the nucleus. The C-terminal serine-rich cluster of ZFP36L1 is critical for the regulation of its nuclear accumulation because truncation of this probable disordered region enhanced the nuclear localization of ZFP36L1, increased its stability and abolished its cell cycle-dependent fluctuations. These findings provide the first hints to the question of how ZFP36L1 nuclear accumulation is controlled during the course of the cell cycle.
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Affiliation(s)
- Yuki Matsuura
- Laboratory of Cell Biology and Biochemistry, Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Aya Noguchi
- Laboratory of Cell Biology and Biochemistry, Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Shunsuke Sakai
- Laboratory of Cell Biology and Biochemistry, Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Naoto Yokota
- Laboratory of Cell Biology and Biochemistry, Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
| | - Hiroyuki Kawahara
- Laboratory of Cell Biology and Biochemistry, Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan
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13
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Munier CC, Ottmann C, Perry MWD. 14-3-3 modulation of the inflammatory response. Pharmacol Res 2020; 163:105236. [PMID: 33053447 DOI: 10.1016/j.phrs.2020.105236] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/02/2020] [Accepted: 10/04/2020] [Indexed: 01/11/2023]
Abstract
Regulation of inflammation is a central part of the maintenance of homeostasis by the immune system. One important class of regulatory protein that has been shown to have effects on the inflammatory process are the 14-3-3 proteins. Herein we describe the roles that have been identified for 14-3-3 in regulation of the inflammatory response. These roles encompass regulation of the response that affect inflammation at the genetic, molecular and cellular levels. At a genetic level 14-3-3 is involved in the regulation of multiple transcription factors and affects the transcription of key effectors of the immune response. At a molecular level many of the constituent parts of the inflammatory process, such as pattern recognition receptors, protease activated receptors and cytokines are regulated through phosphorylation and recognition by 14-3-3 whilst disruption of the recognition processes has been observed to result in clinical syndromes. 14-3-3 is also involved in the regulation of cell proliferation and differentiation, this has been shown to affect the immune system, particularly T- and B-cells. Finally, we discuss how abnormal levels of 14-3-3 contribute to undesirable immune responses and chronic inflammatory conditions.
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Affiliation(s)
- Claire C Munier
- Research and Early Development, Respiratory & Immunology, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden; Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, Den Dolech 2, 5612 AZ Eindhoven, the Netherlands
| | - Christian Ottmann
- Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Complex Molecular Systems, Technische Universiteit Eindhoven, Den Dolech 2, 5612 AZ Eindhoven, the Netherlands
| | - Matthew W D Perry
- Research and Early Development, Respiratory & Immunology, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden.
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14
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RNA-Binding Proteins in Acute Leukemias. Int J Mol Sci 2020; 21:ijms21103409. [PMID: 32408494 PMCID: PMC7279408 DOI: 10.3390/ijms21103409] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/07/2020] [Accepted: 05/10/2020] [Indexed: 12/12/2022] Open
Abstract
Acute leukemias are genetic diseases caused by translocations or mutations, which dysregulate hematopoiesis towards malignant transformation. However, the molecular mode of action is highly versatile and ranges from direct transcriptional to post-transcriptional control, which includes RNA-binding proteins (RBPs) as crucial regulators of cell fate. RBPs coordinate RNA dynamics, including subcellular localization, translational efficiency and metabolism, by binding to their target messenger RNAs (mRNAs), thereby controlling the expression of the encoded proteins. In view of the growing interest in these regulators, this review summarizes recent research regarding the most influential RBPs relevant in acute leukemias in particular. The reported RBPs, either dysregulated or as components of fusion proteins, are described with respect to their functional domains, the pathways they affect, and clinical aspects associated with their dysregulation or altered functions.
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15
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Otsuka H, Fukao A, Tomohiro T, Adachi S, Suzuki T, Takahashi A, Funakami Y, Natsume T, Yamamoto T, Duncan KE, Fujiwara T. ARE-binding protein ZFP36L1 interacts with CNOT1 to directly repress translation via a deadenylation-independent mechanism. Biochimie 2020; 174:49-56. [PMID: 32311426 DOI: 10.1016/j.biochi.2020.04.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/12/2020] [Accepted: 04/13/2020] [Indexed: 10/24/2022]
Abstract
Eukaryotic gene expression can be spatiotemporally tuned at the post-transcriptional level by cis-regulatory elements in mRNA sequences. An important example is the AU-rich element (ARE), which induces mRNA destabilization in a variety of biological contexts in mammals and can also mediate translational control. Regulation is mediated by trans-acting factors that recognize the ARE, such as Tristetraprolin (TTP) and BRF1/ZFP36L1. Although both proteins can destabilize their target mRNAs through the recruitment of the CCR4-NOT deadenylation complex, TTP also directly regulates translation. Whether ZFP36L1 can directly repress translation remains unknown. Here, we used an in vitro translation system derived from mammalian cell lines to address this key mechanistic issue in ARE regulation by ZFP36L1. Functional assays with mutant proteins reveal that ZFP36L1 can repress translation via AU-Rich elements independent of deadenylation. ZFP36L1-mediated translation repression requires interaction between ZFP36L1 and CNOT1, suggesting that it might use a repression mechanism similar to either TPP or miRISC. However, several lines of evidence suggest that the similarity ends there. Unlike, TTP, it does not efficiently interact with either 4E-HP or GIGYF2, suggesting it does not repress translation by recruiting these proteins to the mRNA cap. Moreover, ZFP36L1 could not repress ECMV-IRES driven translation and was resistant to pharmacological eIF4A inhibitor silvestrol, suggesting fundamental differences with miRISC repression via eIF4A. Collectively, our results reveal that ZFP36L1 represses translation directly and suggest that it does so via a novel mechanism distinct from other translational regulators that interact with the CCR4-NOT deadenylase complex.
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Affiliation(s)
- Hiroshi Otsuka
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan
| | | | - Takumi Tomohiro
- Laboratory of RNA Function, Institute for Quantitative Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Shungo Adachi
- Molecular Profiling Research Center for Drug Discovery (molprof), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Toru Suzuki
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, RIKEN, 1-7-22, Suehiro-cho, Yokohama, Japan
| | - Akinori Takahashi
- Cell Signal Unit, Okinawa Institute of Science and Technology, Onna-son, Kunigami-gun, Okinawa, Japan
| | | | - Toru Natsume
- Molecular Profiling Research Center for Drug Discovery (molprof), National Institute of Advanced Industrial Science and Technology (AIST), Tokyo, Japan
| | - Tadashi Yamamoto
- Laboratory for Immunogenetics, Center for Integrative Medical Sciences, RIKEN, 1-7-22, Suehiro-cho, Yokohama, Japan; Cell Signal Unit, Okinawa Institute of Science and Technology, Onna-son, Kunigami-gun, Okinawa, Japan
| | - Kent E Duncan
- Neuronal Translational Control Group, Center for Molecular Neurobiology (ZMNH), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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16
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Salerno F, Turner M, Wolkers MC. Dynamic Post-Transcriptional Events Governing CD8+ T Cell Homeostasis and Effector Function. Trends Immunol 2020; 41:240-254. [DOI: 10.1016/j.it.2020.01.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 01/08/2020] [Accepted: 01/08/2020] [Indexed: 12/31/2022]
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17
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Loh XY, Sun QY, Ding LW, Mayakonda A, Venkatachalam N, Yeo MS, Silva TC, Xiao JF, Doan NB, Said JW, Ran XB, Zhou SQ, Dakle P, Shyamsunder P, Koh APF, Huang RYJ, Berman BP, Tan SY, Yang H, Lin DC, Koeffler HP. RNA-Binding Protein ZFP36L1 Suppresses Hypoxia and Cell-Cycle Signaling. Cancer Res 2019; 80:219-233. [PMID: 31551365 DOI: 10.1158/0008-5472.can-18-2796] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 06/28/2019] [Accepted: 09/16/2019] [Indexed: 11/16/2022]
Abstract
ZFP36L1 is a tandem zinc-finger RNA-binding protein that recognizes conserved adenylate-uridylate-rich elements (ARE) located in 3'untranslated regions (UTR) to mediate mRNA decay. We hypothesized that ZFP36L1 is a negative regulator of a posttranscriptional hub involved in mRNA half-life regulation of cancer-related transcripts. Analysis of in silico data revealed that ZFP36L1 was significantly mutated, epigenetically silenced, and downregulated in a variety of cancers. Forced expression of ZFP36L1 in cancer cells markedly reduced cell proliferation in vitro and in vivo, whereas silencing of ZFP36L1 enhanced tumor cell growth. To identify direct downstream targets of ZFP36L1, systematic screening using RNA pull-down of wild-type and mutant ZFP36L1 as well as whole transcriptome sequencing of bladder cancer cells {plus minus} tet-on ZFP36L1 was performed. A network of 1,410 genes was identified as potential direct targets of ZFP36L1. These targets included a number of key oncogenic transcripts such as HIF1A, CCND1, and E2F1. ZFP36L1 specifically bound to the 3'UTRs of these targets for mRNA degradation, thus suppressing their expression. Dual luciferase reporter assays and RNA electrophoretic mobility shift assays showed that wild-type, but not zinc-finger mutant ZFP36L1, bound to HIF1A 3'UTR and mediated HIF1A mRNA degradation, leading to reduced expression of HIF1A and its downstream targets. Collectively, our findings reveal an indispensable role of ZFP36L1 as a posttranscriptional safeguard against aberrant hypoxic signaling and abnormal cell-cycle progression. SIGNIFICANCE: RNA-binding protein ZFP36L1 functions as a tumor suppressor by regulating the mRNA stability of a number of mRNAs involved in hypoxia and cell-cycle signaling.
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Affiliation(s)
- Xin-Yi Loh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Qiao-Yang Sun
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Ling-Wen Ding
- Cancer Science Institute of Singapore, National University of Singapore, Singapore.
| | - Anand Mayakonda
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | | | - Mei-Shi Yeo
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Tiago C Silva
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil.,Center for Bioinformatics and Functional Genomics, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California
| | - Jin-Fen Xiao
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Ngan B Doan
- Pathology and Laboratory Medicine, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Jonathan W Said
- Pathology and Laboratory Medicine, Ronald Reagan UCLA Medical Center, Los Angeles, California
| | - Xue-Bin Ran
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Si-Qin Zhou
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Pushkar Dakle
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Pavithra Shyamsunder
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Angele Pei-Fern Koh
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Ruby Yun-Ju Huang
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Benjamin P Berman
- Center for Bioinformatics and Functional Genomics, Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California.,Department of Developmental Biology and Cancer Research, Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem, Israel
| | - Soo-Yong Tan
- Department of Pathology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Henry Yang
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - De-Chen Lin
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California
| | - H Phillip Koeffler
- Cancer Science Institute of Singapore, National University of Singapore, Singapore.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California.,National University Cancer Institute of Singapore, National University Hospital, Singapore
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18
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McCarthy PC, Phair IR, Greger C, Pardali K, McGuire VA, Clark AR, Gaestel M, Arthur JSC. IL-33 regulates cytokine production and neutrophil recruitment via the p38 MAPK-activated kinases MK2/3. Immunol Cell Biol 2018; 97:54-71. [PMID: 30171775 PMCID: PMC6378613 DOI: 10.1111/imcb.12200] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 08/28/2018] [Accepted: 08/28/2018] [Indexed: 12/11/2022]
Abstract
IL-33 is an IL-1-related cytokine that can act as an alarmin when released from necrotic cells. Once released, it can target various immune cells including mast cells, innate lymphoid cells and T cells to elicit a Th2-like immune response. We show here that bone marrow-derived mast cells produce IL-13, IL-6, TNF, GM-CSF, CCL3 and CCL4 in response to IL-33 stimulation. Inhibition of the p38 MAPK, or inhibition or knockout of its downstream kinases MK2 and MK3, blocked the production of these cytokines in response to IL-33. The mechanism downstream of MK2/3 was cytokine specific; however, MK2 and MK3 were able to regulate TNF and GM-CSF mRNA stability. Previous studies in macrophages have shown that MK2 regulates mRNA stability via phosphorylation of the RNA-binding protein TTP (Zfp36). The regulation of cytokine production in mast cells was, however, independent of TTP. MK2/3 were able to phosphorylate the TTP-related protein Brf1 (Zfp36 l1) in IL-33-stimulated mast cells, suggesting a mechanism by which MK2/3 might control mRNA stability in these cells. In line with its ability to regulate in vitro IL-33-stimulated cytokine production, double knockout of MK2 and 3 in mice prevented neutrophil recruitment following intraperitoneal injection of IL-33.
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Affiliation(s)
- Pierre C McCarthy
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK.,MRC Protein Phosphorylation Unit, School of Life Sciences, Sir James Black Centre, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Iain R Phair
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Corinna Greger
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK
| | - Katerina Pardali
- Respiratory, Inflammation & Autoimmunity IMED Biotech Unit, AstraZeneca, Gothenburg, Mölndal, 43183, Sweden
| | - Victoria A McGuire
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK.,Photobiology Unit, Scottish Cutaneous Porphyria Service, Ninewells Hospital and Medical School, Dundee, DD1 9SY, UK
| | - Andrew R Clark
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Matthias Gaestel
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK.,Institute for Cell Biochemistry, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover, 30623, Germany
| | - J Simon C Arthur
- Division of Cell Signalling and Immunology, School of Life Sciences, Wellcome Trust Building, University of Dundee, Dow St, Dundee, DD1 5EH, UK
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19
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Qi MY, Song JW, Zhang Z, Huang S, Jing Q. P38 activation induces the dissociation of tristetraprolin from Argonaute 2 to increase ARE-mRNA stabilization. Mol Biol Cell 2018; 29:988-1002. [PMID: 29444957 PMCID: PMC5896936 DOI: 10.1091/mbc.e17-02-0105] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
ARE-mRNAs are actively degraded with tristetraprolin (TTP) in resting cells while they turn into stable messengers in activated cells. P38 plays a crucial role in stabilizing ARE-mRNA. Here we reveal that P38 activation represses the interaction between TTP and Ago2, thus restraining TTP from being targeted into processing bodies and stabilizing ARE-mRNA.
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Affiliation(s)
- Mei-Yan Qi
- Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jing-Wen Song
- Department of Cardiology, Changhai Hospital, Shanghai 200433, China
| | - Zhuo Zhang
- Department of Cardiology, Changhai Hospital, Shanghai 200433, China.,Synthetic Biology and Biotechnology Laboratory, State Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation Center for Biomanufacturing Technology, East China University of Science and Technology, Shanghai 200237, China
| | - Shuang Huang
- Department of Cardiology, Changhai Hospital, Shanghai 200433, China
| | - Qing Jing
- Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.,Department of Cardiology, Changhai Hospital, Shanghai 200433, China
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20
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The control of inflammation via the phosphorylation and dephosphorylation of tristetraprolin: a tale of two phosphatases. Biochem Soc Trans 2017; 44:1321-1337. [PMID: 27911715 PMCID: PMC5095909 DOI: 10.1042/bst20160166] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Revised: 07/25/2016] [Accepted: 07/28/2016] [Indexed: 12/14/2022]
Abstract
Twenty years ago, the first description of a tristetraprolin (TTP) knockout mouse highlighted the fundamental role of TTP in the restraint of inflammation. Since then, work from several groups has generated a detailed picture of the expression and function of TTP. It is a sequence-specific RNA-binding protein that orchestrates the deadenylation and degradation of several mRNAs encoding inflammatory mediators. It is very extensively post-translationally modified, with more than 30 phosphorylations that are supported by at least two independent lines of evidence. The phosphorylation of two particular residues, serines 52 and 178 of mouse TTP (serines 60 and 186 of the human orthologue), has profound effects on the expression, function and localisation of TTP. Here, we discuss the control of TTP biology via its phosphorylation and dephosphorylation, with a particular focus on recent advances and on questions that remain unanswered.
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21
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Desroches-Castan A, Feige JJ, Cherradi N. ACTH Action on Messenger RNA Stability Mechanisms. Front Endocrinol (Lausanne) 2017; 8:3. [PMID: 28163695 PMCID: PMC5247459 DOI: 10.3389/fendo.2017.00003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 01/05/2017] [Indexed: 01/30/2023] Open
Abstract
The regulation of mRNA stability has emerged as a critical control step in dynamic gene expression. This process occurs in response to modifications of the cellular environment, including hormonal variations, and regulates the expression of subsets of proteins whose levels need to be rapidly adjusted. Modulation of messenger RNA stability is usually mediated by stabilizing or destabilizing RNA-binding proteins (RNA-BP) that bind to the 3'-untranslated region regulatory motifs, such as AU-rich elements (AREs). Destabilizing ARE-binding proteins enhance the decay of their target transcripts by recruiting the mRNA decay machineries. Failure of such mechanisms, in particular misexpression of RNA-BP, has been linked to several human diseases. In the adrenal cortex, the expression and activity of mRNA stability regulatory proteins are still understudied. However, ACTH- or cAMP-elicited changes in the expression/phosphorylation status of the major mRNA-destabilizing protein TIS11b/BRF1 or in the subcellular localization of the stabilizing protein Human antigen R have been reported. They suggest that this level of regulation of gene expression is also important in endocrinology.
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Affiliation(s)
- Agnès Desroches-Castan
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Grenoble, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l’Infection, Grenoble, France
- Université Grenoble Alpes, Unité Mixte de Recherche-S1036, Grenoble, France
| | - Jean-Jacques Feige
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Grenoble, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l’Infection, Grenoble, France
- Université Grenoble Alpes, Unité Mixte de Recherche-S1036, Grenoble, France
| | - Nadia Cherradi
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Grenoble, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l’Infection, Grenoble, France
- Université Grenoble Alpes, Unité Mixte de Recherche-S1036, Grenoble, France
- *Correspondence: Nadia Cherradi,
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22
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Qian F, Deng J, Wang G, Ye RD, Christman JW. Pivotal Role of Mitogen-Activated Protein Kinase-Activated Protein Kinase 2 in Inflammatory Pulmonary Diseases. Curr Protein Pept Sci 2016; 17:332-42. [PMID: 26119506 DOI: 10.2174/1389203716666150629121324] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 06/25/2015] [Accepted: 06/26/2015] [Indexed: 01/11/2023]
Abstract
Mitogen-activated protein kinase (MAPK)-activated protein kinase (MK2) is exclusively regulated by p38 MAPK in vivo. Upon activation of p38 MAPK, MK2 binds with p38 MAPK, leading to phosphorylation of TTP, Hsp27, Akt, and Cdc25 that are involved in regulation of various essential cellular functions. In this review, we discuss current knowledge about molecular mechanisms of MK2 in regulation of TNF-α production, NADPH oxidase activation, neutrophil migration, and DNA-damage-induced cell cycle arrest which are involved in the molecular pathogenesis of acute lung injury, pulmonary fibrosis, and non-small-cell lung cancer. Collectively current and emerging new information indicate that developing MK2 inhibitors and blocking MK2-mediated signal pathways are potential therapeutic strategies for treatment of inflammatory and fibrotic lung diseases and lung cancer.
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Affiliation(s)
- Feng Qian
- Department of Internal Medicine, The Ohio State University, 201 Davis Heart and Lung Research Institute, 473 West 12th Avenue, Columbus, OH 43210, USA.
| | | | | | | | - John W Christman
- Department of Internal Medicine, The Ohio State University, 201 Davis Heart and Lung Research Institute, 473 West 12th Avenue, Columbus, OH 43210, USA.
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23
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Rataj F, Planel S, Desroches-Castan A, Le Douce J, Lamribet K, Denis J, Feige JJ, Cherradi N. The cAMP pathway regulates mRNA decay through phosphorylation of the RNA-binding protein TIS11b/BRF1. Mol Biol Cell 2016; 27:3841-3854. [PMID: 27708140 PMCID: PMC5170607 DOI: 10.1091/mbc.e16-06-0379] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 09/29/2016] [Accepted: 09/30/2016] [Indexed: 02/01/2023] Open
Abstract
TIS11b belongs to the tristetraprolin family of zinc-finger proteins, which target short-lived mRNA for degradation. This study shows that the cAMP pathway up-regulates TIS11b expression and modulates its function in mRNA decay through PKA-dependent phosphorylation of two highly conserved phosphosites. TPA-inducible sequence 11b/butyrate response factor 1 (TIS11b/BRF1) belongs to the tristetraprolin (TTP) family of zinc-finger proteins, which bind to mRNAs containing AU-rich elements in their 3′-untranslated region and target them for degradation. Regulation of TTP family function through phosphorylation by p38 MAP kinase and Akt/protein kinase B signaling pathways has been extensively studied. In contrast, the role of cAMP-dependent protein kinase (PKA) in the control of TTP family activity in mRNA decay remains largely unknown. Here we show that PKA activation induces TIS11b gene expression and protein phosphorylation. Site-directed mutagenesis combined with kinase assays and specific phosphosite immunodetection identified Ser-54 (S54) and Ser-334 (S334) as PKA target amino acids in vitro and in vivo. Phosphomimetic mutation of the C-terminal S334 markedly increased TIS11b half-life and, unexpectedly, enhanced TIS11b activity on mRNA decay. Examination of protein–protein interactions between TIS11b and components of the mRNA decay machinery revealed that mimicking phosphorylation at S334 enhances TIS11b interaction with the decapping coactivator Dcp1a, while preventing phosphorylation at S334 potentiates its interaction with the Ccr4-Not deadenylase complex subunit Cnot1. Collectively our findings establish for the first time that cAMP-elicited phosphorylation of TIS11b plays a key regulatory role in its mRNA decay-promoting function.
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Affiliation(s)
- Felicitas Rataj
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Séverine Planel
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Agnès Desroches-Castan
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Juliette Le Douce
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Khadija Lamribet
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Josiane Denis
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Jean-Jacques Feige
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
| | - Nadia Cherradi
- Institut National de la Santé et de la Recherche Médicale, INSERM U1036, Commissariat à l'Energie Atomique et aux Energies Alternatives, Institut de Biosciences et Biotechnologies de Grenoble, Laboratoire Biologie du Cancer et de l'Infection, and Université Grenoble Alpes, Unité Mixte de Recherche-S1036, F-38000 Grenoble, France
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24
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Corcoran JA, McCormick C. Viral activation of stress-regulated Rho-GTPase signaling pathway disrupts sites of mRNA degradation to influence cellular gene expression. Small GTPases 2015; 6:178-85. [PMID: 26480288 PMCID: PMC4905259 DOI: 10.1080/21541248.2015.1093068] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 09/07/2015] [Accepted: 09/08/2015] [Indexed: 01/09/2023] Open
Abstract
Viruses are useful tools that often reveal previously unrecognized levels of control within a cell. By studying the oncogenic Kaposi's sarcoma-associated herpesvirus (KSHV), we discovered a new signaling axis in endothelial cells (ECs) that links actin cytoskeleton dynamics to post-transcriptional control of gene expression. Translational repression and rapid decay of mRNAs containing AU-rich elements (AREs) occurs in cytoplasmic RNA granules known as processing bodies (PBs). Rho-GTPase activity influences PB dynamics but mechanistic details remain obscure. We have previously shown that the KSHV Kaposin B protein blocks the degradation of ARE-mRNAs that encode potent cytokines and angiogenic factors, at least in part by preventing PB formation. Moreover, Kaposin B is sufficient to cause marked alterations in endothelial cell physiology including the formation of long parallel actin stress fibers and accelerated migration and angiogenic phenotypes. All of these phenotypes depend on Kaposin B-mediated activation of a non-canonical signaling pathway comprising the stress-inducible kinase MK2, hsp27, p115RhoGEF and RhoA. Accelerated endothelial cell migration and angiogenesis depends on the subsequent activation of the RhoA-dependent kinase ROCK, but PB disruption is ROCK-independent. In this Commentary, we discuss implications of the activation of this signaling axis, and propose mechanistic links between RhoA activation and PB dynamics.
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Affiliation(s)
- Jennifer A Corcoran
- Department of Microbiology and Immunology; Dalhousie University; Halifax NS, Canada
| | - Craig McCormick
- Department of Microbiology and Immunology; Dalhousie University; Halifax NS, Canada
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25
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Abstract
Cellular senescence is often accompanied by the production of secreted proteins that mediate the diverse effects of senescence on the tissue microenvironment. The mammalian target of rapamycin (mTOR), a master regulator of protein synthesis, is now shown to control the senescence-associated secretory phenotype by modulating gene transcription and mRNA translation and stabilization.
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Affiliation(s)
- Kosuke Tomimatsu
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
| | - Masashi Narita
- University of Cambridge, Cancer Research UK Cambridge Institute, Robinson Way, Cambridge, CB2 0RE, UK
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26
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Newman R, McHugh J, Turner M. RNA binding proteins as regulators of immune cell biology. Clin Exp Immunol 2015. [PMID: 26201441 DOI: 10.1111/cei.12684] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Sequence-specific RNA binding proteins (RBP) are important regulators of the immune response. RBP modulate gene expression by regulating splicing, polyadenylation, localization, translation and decay of target mRNAs. Increasing evidence suggests that RBP play critical roles in the development, activation and function of lymphocyte populations in the immune system. This review will discuss the post-transcriptional regulation of gene expression by RBP during lymphocyte development, with particular focus on the Tristetraprolin family of RBP.
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Affiliation(s)
- R Newman
- Babraham Institute, Cambridge, UK
| | - J McHugh
- Babraham Institute, Cambridge, UK
| | - M Turner
- Babraham Institute, Cambridge, UK
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Herranz N, Gallage S, Mellone M, Wuestefeld T, Klotz S, Hanley CJ, Raguz S, Acosta JC, Innes AJ, Banito A, Georgilis A, Montoya A, Wolter K, Dharmalingam G, Faull P, Carroll T, Martínez-Barbera JP, Cutillas P, Reisinger F, Heikenwalder M, Miller RA, Withers D, Zender L, Thomas GJ, Gil J. mTOR regulates MAPKAPK2 translation to control the senescence-associated secretory phenotype. Nat Cell Biol 2015; 17:1205-17. [PMID: 26280535 PMCID: PMC4589897 DOI: 10.1038/ncb3225] [Citation(s) in RCA: 474] [Impact Index Per Article: 52.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 07/20/2015] [Indexed: 12/15/2022]
Abstract
Senescent cells secrete a combination of factors collectively known as the senescence-associated secretory phenotype (SASP). The SASP reinforces senescence and activates an immune surveillance response, but it can also show pro-tumorigenic properties and contribute to age-related pathologies. In a drug screen to find new SASP regulators, we uncovered the mTOR inhibitor rapamycin as a potent SASP suppressor. Here we report a mechanism by which mTOR controls the SASP by differentially regulating the translation of the MK2 (also known as MAPKAPK2) kinase through 4EBP1. In turn, MAPKAPK2 phosphorylates the RNA-binding protein ZFP36L1 during senescence, inhibiting its ability to degrade the transcripts of numerous SASP components. Consequently, mTOR inhibition or constitutive activation of ZFP36L1 impairs the non-cell-autonomous effects of senescent cells in both tumour-suppressive and tumour-promoting contexts. Altogether, our results place regulation of the SASP as a key mechanism by which mTOR could influence cancer, age-related diseases and immune responses.
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Affiliation(s)
- Nicolás Herranz
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Suchira Gallage
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Metabolic Signalling Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Massimiliano Mellone
- Cancer Sciences Unit, Cancer Research UK Centre, Somers Building, University of Southampton, Southampton SO16 6YD, UK
| | - Torsten Wuestefeld
- Division of Molecular Oncology of Solid Tumors, Dept. of Internal Medicine I, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Sabrina Klotz
- Division of Molecular Oncology of Solid Tumors, Dept. of Internal Medicine I, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Christopher J. Hanley
- Cancer Sciences Unit, Cancer Research UK Centre, Somers Building, University of Southampton, Southampton SO16 6YD, UK
| | - Selina Raguz
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Juan Carlos Acosta
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Andrew J Innes
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Ana Banito
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Athena Georgilis
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Alex Montoya
- Proteomics Facility; MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Katharina Wolter
- Division of Molecular Oncology of Solid Tumors, Dept. of Internal Medicine I, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Gopuraja Dharmalingam
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Peter Faull
- Proteomics Facility; MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Thomas Carroll
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | | | - Pedro Cutillas
- Proteomics Facility; MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Florian Reisinger
- Institute for Virology, Technische Universität München/Helmholtz Zentrum München, Munich, Germany
| | - Mathias Heikenwalder
- Institute for Virology, Technische Universität München/Helmholtz Zentrum München, Munich, Germany
- Division of Chronic Inflammation and Cancer, German Cancer Research (DKFZ), Heidelberg, Germany
| | - Richard A. Miller
- Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, MI 48109-2200, USA
| | - Dominic Withers
- Metabolic Signalling Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
| | - Lars Zender
- Division of Molecular Oncology of Solid Tumors, Dept. of Internal Medicine I, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | - Gareth J. Thomas
- Cancer Sciences Unit, Cancer Research UK Centre, Somers Building, University of Southampton, Southampton SO16 6YD, UK
| | - Jesús Gil
- Cell Proliferation Group, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
- Epigenetics Section, MRC Clinical Sciences Centre, Imperial College London, Hammersmith Campus, London W12 0NN, UK
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28
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Wang KT, Wang HH, Wu YY, Su YL, Chiang PY, Lin NY, Wang SC, Chang GD, Chang CJ. Functional regulation of Zfp36l1 and Zfp36l2 in response to lipopolysaccharide in mouse RAW264.7 macrophages. JOURNAL OF INFLAMMATION-LONDON 2015; 12:42. [PMID: 26180518 PMCID: PMC4502546 DOI: 10.1186/s12950-015-0088-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 06/25/2015] [Indexed: 01/07/2023]
Abstract
Background The tristetraprolin (TTP) family of mRNA-binding proteins contains three major members, Ttp, Zfp36l1, and Zfp36l2. Ttp down-regulates the stability of AU-rich element–containing mRNAs and functions as an anti-inflammation regulator. Methods To examine whether other TTP family proteins also play roles in the inflammatory response, their expression profiles and the possible mRNA targets were determined in the knockdown cells. Results Ttp mRNA and protein were highly induced by lipopolysaccharide (LPS), whereas Zfp36l1 and Zfp36l2 mRNAs were down-regulated and their proteins were phosphorylated during early lipopolysaccharide stimulation. Biochemical and functional analyses exhibited that the decrease of Zfp36l2 mRNA was cross-regulated by Ttp. Knockdown of Zfp36l1 and Zfp36l2 increased the basal level of Mkp-1 mRNAs by prolonging its half-life. Increasing the expression of Mkp-1 inhibited the activation of p38 MAPK under lipopolysaccharide stimulation and down-regulated Tnfα, and Ttp mRNA. In addition, hyper-phosphorylation of Zfp36l1 might stabilize Mkp-1 expression by forming a complex with the adapter protein 14-3-3 and decreasing the interaction with deadenylase Caf1a. Conclusions Our findings imply that the expression and phosphorylation of Zfp36l1 and Zfp36l2 may modulate the basal level of Mkp-1 mRNA to control p38 MAPK activity during lipopolysaccharide stimulation, which would affect the inflammatory mediators production. Zfp36l1 and Zfp36l2 are important regulators of the innate immune response. Electronic supplementary material The online version of this article (doi:10.1186/s12950-015-0088-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Kuan-Ting Wang
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan
| | - Hsin-Hui Wang
- Department of Pediatrics, Division of Pediatric Immunology and Nephrology, Taipei Veterans General Hospital, No.201, Sec. 2, Shipai Road, Beitou District, Taipei, 112 Taiwan ; Department of Pediatrics, Faculty of Medicine, School of Medicine, and Institute of Emergency and Critical Care Medicine, School of Medicine, National Yang-Ming University, No.155, Sec.2, Linong Street, Beitou District, Taipei, 112 Taiwan
| | - Yan-Yun Wu
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan
| | - Yu-Lun Su
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan
| | - Pei-Yu Chiang
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan
| | - Nien-Yi Lin
- Institute of Biological Chemistry, Academia Sinica, No.128, Sec.2, Academia Road, Nankang, Taipei, 11529 Taiwan
| | - Shun-Chang Wang
- Institute of Biological Chemistry, Academia Sinica, No.128, Sec.2, Academia Road, Nankang, Taipei, 11529 Taiwan
| | - Geen-Dong Chang
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan
| | - Ching-Jin Chang
- Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, No.1 Sec. 4 Roosevelt Road, Taipei, 10617 Taiwan ; Institute of Biological Chemistry, Academia Sinica, No.128, Sec.2, Academia Road, Nankang, Taipei, 11529 Taiwan
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29
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Smallie T, Ross EA, Ammit AJ, Cunliffe HE, Tang T, Rosner DR, Ridley ML, Buckley CD, Saklatvala J, Dean JL, Clark AR. Dual-Specificity Phosphatase 1 and Tristetraprolin Cooperate To Regulate Macrophage Responses to Lipopolysaccharide. THE JOURNAL OF IMMUNOLOGY 2015; 195:277-88. [PMID: 26019272 PMCID: PMC4472943 DOI: 10.4049/jimmunol.1402830] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 04/27/2015] [Indexed: 01/01/2023]
Abstract
Dual-specificity phosphatase (DUSP) 1 dephosphorylates and inactivates members of the MAPK superfamily, in particular, JNKs, p38α, and p38β MAPKs. It functions as an essential negative regulator of innate immune responses, hence disruption of the Dusp1 gene renders mice extremely sensitive to a wide variety of experimental inflammatory challenges. The principal mechanisms behind the overexpression of inflammatory mediators by Dusp1(-/-) cells are not known. In this study, we use a genetic approach to identify an important mechanism of action of DUSP1, involving the modulation of the activity of the mRNA-destabilizing protein tristetraprolin. This mechanism is key to the control of essential early mediators of inflammation, TNF, CXCL1, and CXCL2, as well as the anti-inflammatory cytokine IL-10. The same mechanism also contributes to the regulation of a large number of transcripts induced by treatment of macrophages with LPS. These findings demonstrate that modulation of the phosphorylation status of tristetraprolin is an important physiological mechanism by which innate immune responses can be controlled.
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Affiliation(s)
- Tim Smallie
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Ewan A Ross
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Alaina J Ammit
- Faculty of Pharmacy, The University of Sydney, New South Wales 2006, Australia; and
| | - Helen E Cunliffe
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Tina Tang
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Dalya R Rosner
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Michael L Ridley
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Christopher D Buckley
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Jeremy Saklatvala
- Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, United Kingdom
| | - Jonathan L Dean
- Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, United Kingdom
| | - Andrew R Clark
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;
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30
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Boucas J, Fritz C, Schmitt A, Riabinska A, Thelen L, Peifer M, Leeser U, Nuernberg P, Altmueller J, Gaestel M, Dieterich C, Reinhardt HC. Label-Free Protein-RNA Interactome Analysis Identifies Khsrp Signaling Downstream of the p38/Mk2 Kinase Complex as a Critical Modulator of Cell Cycle Progression. PLoS One 2015; 10:e0125745. [PMID: 25993413 PMCID: PMC4439058 DOI: 10.1371/journal.pone.0125745] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Accepted: 03/26/2015] [Indexed: 12/11/2022] Open
Abstract
Growing evidence suggests a key role for RNA binding proteins (RBPs) in genome stability programs. Additionally, recent developments in RNA sequencing technologies, as well as mass-spectrometry techniques, have greatly expanded our knowledge on protein-RNA interactions. We here use full transcriptome sequencing and label-free LC/MS/MS to identify global changes in protein-RNA interactions in response to etoposide-induced genotoxic stress. We show that RBPs have distinct binding patterns in response to genotoxic stress and that inactivation of the RBP regulator module, p38/MK2, can affect the entire spectrum of protein-RNA interactions that take place in response to stress. In addition to validating the role of known RBPs like Srsf1, Srsf2, Elavl1 in the genotoxic stress response, we add a new collection of RBPs to the DNA damage response. We identify Khsrp as a highly regulated RBP in response to genotoxic stress and further validate its role as a driver of the G1/S transition through the suppression of Cdkn1aP21 transcripts. Finally, we identify KHSRP as an indicator of overall survival, as well as disease free survival in glioblastoma multiforme.
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Affiliation(s)
- Jorge Boucas
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
- * E-mail: (HCR); (JB)
| | - Christian Fritz
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
| | - Anna Schmitt
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
| | - Arina Riabinska
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
| | - Lisa Thelen
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
| | - Martin Peifer
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
- Department of Translational Genomics, University of Cologne, Cologne, Germany
| | - Uschi Leeser
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
| | - Peter Nuernberg
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Janine Altmueller
- Cologne Center for Genomics (CCG), University of Cologne, Cologne, Germany
| | - Matthias Gaestel
- Institute of Biochemistry, Hannover Medical School, Hannover, Germany
| | - Christoph Dieterich
- Computational RNA Biology and Ageing, Max Planck Institute for Biology of Ageing, Joseph-Stelzmann Straße 9b, 50913, Cologne, Germany
| | - H. Christian Reinhardt
- Department I of Internal Medicine, University Hospital of Cologne, Weyertal 115B, 50931, Cologne, Germany
- Cologne Excellence Cluster on Cellular Stress Response in Aging-Associated Diseases, University of Cologne, Weyertal 115B, 50931, Cologne, Germany
- * E-mail: (HCR); (JB)
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31
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Ay A, Wilner N, Yildirim N. Mathematical modeling deciphers the benefits of alternatively-designed conserved activatory and inhibitory gene circuits. MOLECULAR BIOSYSTEMS 2015; 11:2017-30. [PMID: 25966646 DOI: 10.1039/c5mb00269a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cells employ a variety of mechanisms as a response to external signals to maintain cellular homeostasis. In this study, we examine four activatory and four inhibitory protein synthesis mechanisms at both population and single cell level that can be triggered by a transient external signal. Activation mechanisms result from the assumption that cells can employ four different modes to temporarily increase the levels of a protein: decreased mRNA degradation, increased mRNA synthesis, decreased protein degradation and increased protein synthesis. For the inhibition mechanisms it is assumed that a cell can reduce a protein's level through four ways: increased mRNA degradation, reduced mRNA synthesis, increased protein degradation and reduced protein synthesis. Deterministic and stochastic models were developed to analyze the dynamic responses of these eight mechanisms to a transient signal. Three different response metrics were used to measure different aspects of the response. These metrics are (i) mid-protein abundance (mP), (ii) time required for the protein to reach the mid-protein level (mT), and (iii) duration of response (D), which is defined as the total time for which the protein (P) abundance are above or below of mid-protein level. Our simulations show that of the activation mechanisms, the signal-dependent increase in mRNA synthesis and protein synthesis are more effective and faster, than the signal dependent decrease in mRNA and protein degradation. On the other hand, the mechanism involving signal dependent increase in protein synthesis is noisier than the signal dependent increase in mRNA synthesis in regard to all metrics used. Of the four inhibition mechanisms, the signal-dependent increase in the protein degradation is the most effective and fastest of the four inhibition mechanisms. It is also noisiest of the four inhibition mechanisms before the protein levels reach a steady state around 100 minutes.
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Affiliation(s)
- Ahmet Ay
- Departments of Biology and Mathematics, Colgate University, 13 Oak Dr. Hamilton, NY 13346, USA
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Tiedje C, Holtmann H, Gaestel M. The role of mammalian MAPK signaling in regulation of cytokine mRNA stability and translation. J Interferon Cytokine Res 2015; 34:220-32. [PMID: 24697200 DOI: 10.1089/jir.2013.0146] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Extracellular-regulated kinases and p38 mitogen-activated protein kinases are activated in innate (and adaptive) immunity and signal via different routes to alter the stability and translation of various cytokine mRNAs, enabling immune cells to respond promptly. This regulation involves mRNA elements, such as AU-rich motifs, and mRNA-binding proteins, such as tristetraprolin (TTP), HuR, and hnRNPK-homology (KH) type splicing regulatory protein (KSRP). Signal-dependent phosphorylation of mRNA-binding proteins often alters their subcellular localization or RNA-binding affinity. Furthermore, it could lead to an altered interaction with other mRNA-binding proteins and altered scaffolding properties for mRNA-modifying enzymes, such as deadenylases, polyadenylases, decapping enzymes, poly(A) binding proteins, exo- or endonucleases, and proteins of the exosome machinery. In many cases, this results in unstable mRNAs being stabilized, with their translational arrest being released and cytokine production being stimulated. Hence, components of these mechanisms are potential targets for the modulation of the inflammatory response.
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Affiliation(s)
- Christopher Tiedje
- Institute of Physiological Chemistry, Hannover Medical School , Hannover, Germany
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Shen ZJ, Malter JS. Regulation of AU-Rich Element RNA Binding Proteins by Phosphorylation and the Prolyl Isomerase Pin1. Biomolecules 2015; 5:412-34. [PMID: 25874604 PMCID: PMC4496679 DOI: 10.3390/biom5020412] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 03/23/2015] [Accepted: 03/31/2015] [Indexed: 01/19/2023] Open
Abstract
The accumulation of 3' untranslated region (3'-UTR), AU-rich element (ARE) containing mRNAs, are predominantly controlled at the post-transcriptional level. Regulation appears to rely on a variable and dynamic interaction between mRNA target and ARE-specific binding proteins (AUBPs). The AUBP-ARE mRNA recognition is directed by multiple intracellular signals that are predominantly targeted at the AUBPs. These include (but are unlikely limited to) methylation, acetylation, phosphorylation, ubiquitination and isomerization. These regulatory events ultimately affect ARE mRNA location, abundance, translation and stability. In this review, we describe recent advances in our understanding of phosphorylation and its impact on conformation of the AUBPs, interaction with ARE mRNAs and highlight the role of Pin1 mediated prolyl cis-trans isomerization in these biological process.
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Affiliation(s)
- Zhong-Jian Shen
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8548, USA.
| | - James S Malter
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75390-8548, USA.
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Shi J, Pabon K, Scotto KW. Methylxanthines Increase Expression of the Splicing Factor SRSF2 by Regulating Multiple Post-transcriptional Mechanisms. J Biol Chem 2015; 290:14986-5003. [PMID: 25818199 DOI: 10.1074/jbc.m114.624254] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Indexed: 01/20/2023] Open
Abstract
We have previously reported that the methylxanthine caffeine increases expression of the splicing factor SRSF2, the levels of which are normally controlled by a negative autoregulatory loop. In the present study we have investigated the mechanisms by which methylxanthines induce this aberrant overexpression. RT-PCR analyses suggested little impact of caffeine on SRSF2 total mRNA levels. Instead, caffeine induced changes in the levels of SRSF2 3' UTR splice variants. Although some of these variants were substrates for nonsense-medicated decay (NMD), and could potentially have been stabilized by caffeine-mediated inhibition of NMD, down-regulation of NMD by a genetic approach was not sufficient to reproduce the phenotype. Furthermore, cell-based assays demonstrated that some of the caffeine-induced variants were intrinsically more efficiently translated than others; the addition of caffeine increased the translational efficiency of most SRSF2 transcripts. MicroRNA array analyses revealed a significant caffeine-mediated decrease in the expression of two SRSF2-targeting miRs, both of which were shown to repress translation of specific SRSF2 splice variants. These data support a complex model whereby caffeine down-regulates SRSF2-targeting microRNAs, leading to an increase in SRSF2 translation, which in turn induces SRSF2 splicing. SRSF2 splice variants are then stabilized by caffeine-mediated NMD inhibition, breaking the normal negative feedback loop and allowing the aberrant increase in SRSF2 protein levels. These findings highlight the complexity of SRSF2 gene regulation, and suggest ways in which SRSF2 expression may be dysregulated in disease.
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Affiliation(s)
- Jia Shi
- From the Rutgers Cancer Institute of New Jersey, the Robert Wood Johnson Medical School, and the Graduate School of Biomedical Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
| | - Kirk Pabon
- From the Rutgers Cancer Institute of New Jersey, the Robert Wood Johnson Medical School, and the Graduate School of Biomedical Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
| | - Kathleen W Scotto
- From the Rutgers Cancer Institute of New Jersey, the Robert Wood Johnson Medical School, and the Graduate School of Biomedical Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08903
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Bauler TJ, Chase JC, Wehrly TD, Bosio CM. Virulent Francisella tularensis destabilize host mRNA to rapidly suppress inflammation. J Innate Immun 2014; 6:793-805. [PMID: 24902499 DOI: 10.1159/000363243] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 04/28/2014] [Indexed: 12/30/2022] Open
Abstract
Highly virulent bacterial pathogens have evolved rapid means to suppress host inflammatory responses by unknown mechanisms. Here, we use virulent Francisella tularensis, the cause of lethal tularemia in humans, as a model to elucidate these mechanisms. We show that following infection of murine macrophages F. tularensis rapidly and selectively destabilizes mRNA containing adenylate-uridylate-rich elements that encode for cytokines and chemokines important in controlling bacterial infection. Degradation of host mRNA encoding interleukin (IL)-1β, IL-6 and CXCL1 did not require viable bacteria or de novo protein synthesis, but did require escape of intracellular organisms from endocytic vesicles into the host cytosol. The specific targeting of host mRNA encoding inflammatory cytokines and chemokines for decay by a bacterial pathogen has not been previously reported. Thus, our findings represent a novel strategy by which a highly virulent pathogen modulates host inflammatory responses critical to the evasion of innate immunity.
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Affiliation(s)
- Timothy J Bauler
- Immunity to Pulmonary Pathogens Section, Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Mont., USA
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Yang L, Liu B, Qiu F, Huang B, Li Y, Huang D, Yang R, Yang X, Deng J, Jiang Q, Zhou Y, Lu J. The effect of functional MAPKAPK2 copy number variation CNV-30450 on elevating nasopharyngeal carcinoma risk is modulated by EBV infection. Carcinogenesis 2013; 35:46-52. [PMID: 24056810 DOI: 10.1093/carcin/bgt314] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
UNLABELLED Mitogen-activated protein kinase-activated protein kinase 2 (MAPKAPK2) is recognized as oncogenic and simulative role on tumorigenesis by virtue of abnormal expression in cancer including nasopharyngeal carcinoma (NPC). We hypothesized that the copy number variation (CNV)-30450, which duplicates the MAPKAPK2 promoter, may affect MAPKAPK2 expression and be associated with NPC risk. In two independent case-control panels of southern and eastern Chinese with a total of 1590 NPC patients and 1979 cancer-free controls, we investigated the association between CNV-30450 and NPC risk by genotyping the CNV-30450 with the TaqMan assay, and tested its biological effect. Consistent findings were observed in the two populations, that the increased copy number of CNV-30450 was associated with increased risk of NPC (3/4-copy versus 2-copy: odds ratio = 1.28, 95% confidence interval = 1.10-1.49), in which lies a biological mechanism that the adverse genotypes enhanced the promoter activity of MAPKAPK2 and elevated MAPKAPK2 expression. Moreover, the CNV-30450 adverse genotypes significantly interacted with Epstein-Barr virus (EBV) infection on increasing NPC risk (P = 0.035), and the genotype-phenotype correlation was only significant in EBV-positive cases (P = 0.037) but not in EBV-negative ones (P = 0.366). These data suggest that the functional CNV-30450 in the MAPKAPK2 promoter elevates the NPC risk with a modulation by EBV infection, which may be an indicator of susceptibility to NPC. SUMMARY This case-control study suggests that the functional CNV-30450 in the MAPKAPK2 promoter elevates the NPC risk with a modulation by EBV infection, which may be an indicator of susceptibility to NPC.
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Affiliation(s)
- Lei Yang
- The Institute for Chemical Carcinogenesis, The State Key Lab of Respiratory Disease, Guangzhou Medical University, 195 Dongfengxi Road, Guangzhou 510182, People's Republic of China
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Chou CF, Lin WJ, Lin CC, Luber CA, Godbout R, Mann M, Chen CY. DEAD box protein DDX1 regulates cytoplasmic localization of KSRP. PLoS One 2013; 8:e73752. [PMID: 24023901 PMCID: PMC3762726 DOI: 10.1371/journal.pone.0073752] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Accepted: 07/22/2013] [Indexed: 11/19/2022] Open
Abstract
mRNA decay mediated by the AU-rich elements (AREs) is one of the most studied post-transcriptional mechanisms and is modulated by ARE-binding proteins (ARE-BPs). To understand the regulation of K homology splicing regulatory protein (KSRP), a decay-promoting ARE-BP, we purified KSRP protein complexes and identified an RNA helicase, DDX1. We showed that down-regulation of DDX1 expression elevated cytoplasmic levels of KSRP and facilitated ARE-mediated mRNA decay. Association of KSRP with 14-3-3 proteins, that are predominately located in the cytoplasm, increased upon reduction of DDX1. We also demonstrated that KSRP associated with DDX1 or 14-3-3, but not both. These observations indicate that subcellular localization of KSRP is regulated by competing interactions with DDX1 or 14-3-3.
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Affiliation(s)
- Chu-Fang Chou
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Wei-Jye Lin
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Chen-Chung Lin
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Christian A. Luber
- Department of Proteomics and Signal Transduction, Max-Planck Institute of Biochemistry, Martinsried, Germany
| | - Roseline Godbout
- Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta, Canada
| | - Matthias Mann
- Department of Proteomics and Signal Transduction, Max-Planck Institute of Biochemistry, Martinsried, Germany
| | - Ching-Yi Chen
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- * E-mail:
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Ciais D, Cherradi N, Feige JJ. Multiple functions of tristetraprolin/TIS11 RNA-binding proteins in the regulation of mRNA biogenesis and degradation. Cell Mol Life Sci 2013; 70:2031-44. [PMID: 22968342 PMCID: PMC11113850 DOI: 10.1007/s00018-012-1150-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 08/27/2012] [Accepted: 08/28/2012] [Indexed: 02/06/2023]
Abstract
Members of the tristetraprolin (TTP/TIS11) family are important RNA-binding proteins initially characterized as mediators of mRNA degradation. They act via their interaction with AU-rich elements present in the 3'UTR of regulated transcripts. However, it is progressively appearing that the different steps of mRNA processing and fate including transcription, splicing, polyadenylation, translation, and degradation are coordinately regulated by multifunctional integrator proteins that possess a larger panel of functions than originally anticipated. Tristetraprolin and related proteins are very good examples of such integrators. This review gathers the present knowledge on the functions of this family of RNA-binding proteins, including their role in AU-rich element-mediated mRNA decay and focuses on recent advances that support the concept of their broader involvement in distinct steps of mRNA biogenesis and degradation.
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Affiliation(s)
- Delphine Ciais
- Institut National de la Santé et de la Recherche Médicale (INSERM) U1036, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV)/Biologie du Cancer et de l’Infection (BCI), 38054 Grenoble, France
- Université Joseph Fourier-Grenoble 1, 38041 Grenoble, France
| | - Nadia Cherradi
- Institut National de la Santé et de la Recherche Médicale (INSERM) U1036, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV)/Biologie du Cancer et de l’Infection (BCI), 38054 Grenoble, France
- Université Joseph Fourier-Grenoble 1, 38041 Grenoble, France
| | - Jean-Jacques Feige
- Institut National de la Santé et de la Recherche Médicale (INSERM) U1036, 17 rue des Martyrs, 38054 Grenoble Cedex 9, France
- Commissariat à l’Energie Atomique et aux Energies Alternatives (CEA), Institut de Recherches en Technologies et Sciences pour le Vivant (iRTSV)/Biologie du Cancer et de l’Infection (BCI), 38054 Grenoble, France
- Université Joseph Fourier-Grenoble 1, 38041 Grenoble, France
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Brooks SA, Blackshear PJ. Tristetraprolin (TTP): interactions with mRNA and proteins, and current thoughts on mechanisms of action. BIOCHIMICA ET BIOPHYSICA ACTA 2013; 1829:666-79. [PMID: 23428348 PMCID: PMC3752887 DOI: 10.1016/j.bbagrm.2013.02.003] [Citation(s) in RCA: 253] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 01/25/2013] [Accepted: 02/04/2013] [Indexed: 12/14/2022]
Abstract
Changes in mRNA stability and translation are critical control points in the regulation of gene expression, particularly genes encoding growth factors, inflammatory mediators, and proto-oncogenes. Adenosine and uridine (AU)-rich elements (ARE), often located in the 3' untranslated regions (3'UTR) of mRNAs, are known to target transcripts for rapid decay. They are also involved in the regulation of mRNA stability and translation in response to extracellular cues. This review focuses on one of the best characterized ARE binding proteins, tristetraprolin (TTP), the founding member of a small family of CCCH tandem zinc finger proteins. In this survey, we have reviewed the current status of TTP interactions with mRNA and proteins, and discussed current thinking about TTP's mechanism of action to promote mRNA decay. We also review the proposed regulation of TTP's functions by phosphorylation. Finally, we have discussed emerging evidence for TTP operating as a translational regulator. This article is part of a Special Issue entitled: RNA Decay mechanisms.
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Affiliation(s)
- Seth A. Brooks
- Veterans Affairs Medical Center, White River Junction, Vermont, USA
- Department of Medicine, Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA
| | - Perry J. Blackshear
- The Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
- Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, North Carolina USA
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Hochdörfer T, Tiedje C, Stumpo DJ, Blackshear PJ, Gaestel M, Huber M. LPS-induced production of TNF-α and IL-6 in mast cells is dependent on p38 but independent of TTP. Cell Signal 2013; 25:1339-47. [PMID: 23499908 DOI: 10.1016/j.cellsig.2013.02.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 02/26/2013] [Indexed: 02/08/2023]
Abstract
The production of the proinflammatory cytokines TNF-α and IL-6 is regulated by various mRNA-binding proteins, influencing stability and translation of the respective transcripts. Research in macrophages has shown the importance of the p38-MK2-tristetraprolin (TTP) axis for regulation of TNF-α mRNA stability and translation. In the current study we examined a possible involvement of p38 and TTP in LPS-induced cytokine production in bone marrow-derived mast cells (BMMCs). Using pharmacological inhibitors we initially found a strong dependence of LPS-induced TNF-α and IL-6 production on p38 activation, whereas activation of the Erk pathway appeared dispensable. LPS treatment also induced p38-dependent expression of the TTP gene. This prompted us to analyze the proinflammatory cytokine response in BMMCs generated from TTP-deficient mice. Unexpectedly, there were no significant differences in cytokine production between TTP-deficient and WT BMMCs in response to LPS. Gene expression and cytokine production of TNF-α and IL-6 as well as stability of the TNF-α transcript were comparable between TTP-deficient and WT BMMCs. In contrast to TTP mRNA expression, TTP protein expression could not be detected in BMMCs. While we successfully precipitated and detected TTP from lysates of LPS-stimulated RAW 264.7 macrophages, this was not accomplished from BMMC lysates. In contrast, we found mRNA and protein expressions of the other TIS11 family members connected to regulation of mRNA stability, BRF1 and BRF2, and detected their interaction with 14-3-3 proteins. These data suggest that control of cytokine mRNA stability and translation in MCs is exerted by proteins different from TTP.
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Affiliation(s)
- Thomas Hochdörfer
- RWTH Aachen University, Medical Faculty, Institute of Biochemistry and Molecular Immunology, Aachen, Germany
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41
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Damgaard CK, Lykke-Andersen J. Regulation of ARE-mRNA Stability by Cellular Signaling: Implications for Human Cancer. Cancer Treat Res 2013; 158:153-80. [PMID: 24222358 DOI: 10.1007/978-3-642-31659-3_7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
During recent years, it has become clear that regulation of mRNA stability is an important event in the control of gene expression. The stability of a large class of mammalian mRNAs is regulated by AU-rich elements (AREs) located in the mRNA 3' UTRs. mRNAs with AREs are inherently labile but as a response to different cellular cues they can become either stabilized, allowing expression of a given gene, or further destabilized to silence their expression. These tightly regulated mRNAs include many that encode growth factors, proto-oncogenes, cytokines, and cell cycle regulators. Failure to properly regulate their stability can therefore lead to uncontrolled expression of factors associated with cell proliferation and has been implicated in several human cancers. A number of transfactors that recognize AREs and regulate the translation and degradation of ARE-mRNAs have been identified. These transfactors are regulated by signal transduction pathways, which are often misregulated in cancers. This chapter focuses on the function of ARE-binding proteins with an emphasis on their regulation by signaling pathways and the implications for human cancer.
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Venigalla RKC, Turner M. RNA-binding proteins as a point of convergence of the PI3K and p38 MAPK pathways. Front Immunol 2012; 3:398. [PMID: 23272005 PMCID: PMC3530045 DOI: 10.3389/fimmu.2012.00398] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 12/10/2012] [Indexed: 12/26/2022] Open
Abstract
Understanding the mechanisms by which signal transduction pathways mediate changes in RNA abundance requires the examination of the fate of RNA from its transcription to its degradation. Evidence suggests that RNA abundance is partly regulated by post-transcriptional mechanisms affecting RNA decay and this in turn is modulated by some of the same signaling pathways that control transcription. Furthermore, the translation of mRNA is a key regulatory step that is influenced by signal transduction. These processes are regulated, in part, by RNA-binding proteins (RBPs) which bind to sequence-specific RNA elements. The function of RBPs is controlled and co-ordinated by phosphorylation. Based on the current literature we hypothesize that RBPs may be a point of convergence for the activity of different kinases such as phosphoinositide-3-kinase and mitogen-activated protein kinase which regulate RBP localization and function.
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Affiliation(s)
- Ram K C Venigalla
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute Babraham, UK
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Xia YJ, Zhao SH, Mao BY. Involvement of XZFP36L1, an RNA-binding protein, in Xenopus neural development. DONG WU XUE YAN JIU = ZOOLOGICAL RESEARCH 2012; 33:E82-8. [PMID: 23266986 DOI: 10.3724/sp.j.1141.2012.e05-06e82] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Xenopus ZFP36L1 (zinc finger protein 36, C3H type-like 1) belongs to the ZFP36 family of RNA-binding proteins, which contains two characteristic tandem CCCH-type zinc-finger domains. The ZFP36 proteins can bind AU-rich elements in 3' untranslated regions of target mRNAs and promote their turnover. However, the expression and role of ZFP36 genes during neural development in Xenopus embryos remains largely unknown. The present study showed that Xenopus ZFP36L1 was expressed at the dorsal part of the forebrain, forebrain-midbrain boundary, and midbrain-hindbrain boundary from late neurula stages to tadpole stages of embryonic development. Overexpression of XZFP36L1 in Xenopus embryos inhibited neural induction and differentiation, leading to severe neural tube defects. The function of XZP36L1 requires both its zinc finger and C terminal domains, which also affect its subcellular localization. These results suggest that XZFP36L1 is likely involved in neural development in Xenopus and might play an important role in post-transcriptional regulation.
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Affiliation(s)
- Ying-Jie Xia
- Kunming Institute of Zoology, the Chinese Academy of Sciences, Kunming, China
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44
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Briata P, Chen CY, Ramos A, Gherzi R. Functional and molecular insights into KSRP function in mRNA decay. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2012. [PMID: 23178464 DOI: 10.1016/j.bbagrm.2012.11.003] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
KSRP is a single strand nucleic acid binding protein that controls gene expression at multiple levels. In this review we focus on the recent molecular, cellular, and structural insights into the mRNA decay promoting function of KSRP. We discuss also some aspects of KSRP-dependent microRNA maturation from precursors that are related to its mRNA destabilizing function. This article is part of a Special Issue entitled: RNA Decay mechanisms.
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Affiliation(s)
- Paola Briata
- IRCCS Azienda Ospedaliera Universitaria San Martino, Genova, Italy
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Boucas J, Riabinska A, Jokic M, Herter-Sprie GS, Chen S, Höpker K, Reinhardt HC. Posttranscriptional regulation of gene expression-adding another layer of complexity to the DNA damage response. Front Genet 2012; 3:159. [PMID: 22936947 PMCID: PMC3427493 DOI: 10.3389/fgene.2012.00159] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2012] [Accepted: 08/06/2012] [Indexed: 12/13/2022] Open
Abstract
In response to DNA damage, cells activate a complex, kinase-based signaling network to arrest the cell cycle and allow time for DNA repair, or, if the extend of damage is beyond repair capacity, induce apoptosis. This signaling network, which is collectively referred to as the DNA damage response (DDR), is primarily thought to consist of two components—a rapid phosphorylation-driven signaling cascade that results in immediate inhibition of Cdk/cyclin complexes and a delayed transcriptional response that promotes a prolonged cell cycle arrest through the induction of Cdk inhibitors, such as p21. In recent years a third layer of complexity has emerged that involves potent posttranscriptional regulatory mechanisms that control the cellular response to DNA damage. Although much has been written on the relevance of the DDR in cancer and on the post-transcriptional role of microRNAs (miRs) in cancer, the post-transcriptional regulation of the DDR by non-coding RNAs and RNA-binding proteins (RBPs) still remains elusive in large parts. Here, we review the recent developments in this exciting new area of research in the cellular response to genotoxic stress. We put specific emphasis on the role of RBPs and the control of their function through DNA damage-activated protein kinases.
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Affiliation(s)
- Jorge Boucas
- Division of Hematology and Oncology, Center for Internal Medicine, University Hospital of Cologne Cologne, Germany
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A functional copy-number variation in MAPKAPK2 predicts risk and prognosis of lung cancer. Am J Hum Genet 2012; 91:384-90. [PMID: 22883146 DOI: 10.1016/j.ajhg.2012.07.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2012] [Revised: 05/22/2012] [Accepted: 07/02/2012] [Indexed: 02/06/2023] Open
Abstract
Mitogen-activated protein kinase-activated protein kinase 2 (MAPKAPK2) may promote cancer development and progression by inducing tumorigenesis and drug resistance. To assess whether the copy-number variation g.CNV-30450 located in the MAPKAPK2 promoter has any effect on lung cancer risk or prognosis, we investigated the association between g.CNV-30450 and cancer risk in three independent case-control studies of 2,332 individuals with lung cancer and 2,457 controls and the effects of g.CNV-30450 on cancer prognosis in 1,137 individuals with lung cancer with survival data in southern and eastern Chinese populations. We found that those subjects who had four copies of g.CNV-30450 had an increased cancer risk (odds ratio = 1.94, 95% confidence interval [CI] = 1.61-2.35) and a worse prognosis for individuals with lung cancer (with a median survival time of only 9 months) (hazard ratio = 1.47, 95% CI = 1.22-1.78) compared with those with two or three copies (with a median survival time of 14 months). Meanwhile, four copies of g.CNV-30450 significantly increased MAPKAPK2 expression, both in vitro and in vivo, compared with two or three copies. Our study establishes a robust association between the functional g.CNV-30450 in MAPKAPK2 and risk as well as prognosis of lung cancer, and it presents this functional copy-number variation as a potential biomarker for susceptibility to and prognosis for lung cancer.
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Lin NY, Lin TY, Yang WH, Wang SC, Wang KT, Su YL, Jiang YW, Chang GD, Chang CJ. Differential expression and functional analysis of the tristetraprolin family during early differentiation of 3T3-L1 preadipocytes. Int J Biol Sci 2012; 8:761-77. [PMID: 22701344 PMCID: PMC3371571 DOI: 10.7150/ijbs.4036] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Accepted: 05/15/2012] [Indexed: 01/09/2023] Open
Abstract
The tristetraprolin (TTP) family comprises zinc finger-containing AU-rich element (ARE)-binding proteins consisting of three major members: TTP, ZFP36L1, and ZFP36L2. The present study generated specific antibodies against each TTP member to evaluate its expression during differentiation of 3T3-L1 preadipocytes. In contrast to the inducible expression of TTP, results indicated constitutive expression of ZFP36L1 and ZFP36L2 in 3T3-L1 preadipocytes and their phosphorylation in response to differentiation signals. Physical RNA pull-down and functional luciferase assays revealed that ZFP36L1 and ZFP36L2 bound to the 3' untranslated region (UTR) of MAPK phosphatase-1 (MKP-1) mRNA and downregulated Mkp-1 3'UTR-mediated luciferase activity. Mkp-1 is an immediate early gene for which the mRNA is transiently expressed in response to differentiation signals. The half-life of Mkp-1 mRNA was longer at 30 min of induction than at 1 h and 2 h of induction. Knockdown of TTP or ZFP36L2 increased the Mkp-1 mRNA half-life at 1 h of induction. Knockdown of ZFP36L1, but not ZFP36L2, increased Mkp-1 mRNA basal levels via mRNA stabilization and downregulated ERK activation. Differentiation induced phosphorylation of ZFP36L1 through ERK and AKT signals. Phosphorylated ZFP36L1 then interacted with 14-3-3, which might decrease its mRNA destabilizing activity. Inhibition of adipogenesis also occurred in ZFP36L1 and TTP knockdown cells. The findings indicate that the differential expression of TTP family members regulates immediate early gene expression and modulates adipogenesis.
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Affiliation(s)
- Nien-Yi Lin
- 1. Institute of Biological Chemistry, Academia Sinica, 128, Academia Road Sec 2, Nankang, Taipei 115, Taiwan
| | - Tzi-Yang Lin
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Wen-Hsuan Yang
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Shun-Chang Wang
- 1. Institute of Biological Chemistry, Academia Sinica, 128, Academia Road Sec 2, Nankang, Taipei 115, Taiwan
| | - Kuan-Ting Wang
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Yu-Lun Su
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Yu-Wun Jiang
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Geen-Dong Chang
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
| | - Ching-Jin Chang
- 1. Institute of Biological Chemistry, Academia Sinica, 128, Academia Road Sec 2, Nankang, Taipei 115, Taiwan
- 2. Graduate Institute of Biochemical Sciences, College of Life Science, National Taiwan University, 1 Roosevelt Road Sec 4, Taipei 106, Taiwan
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Matoulkova E, Michalova E, Vojtesek B, Hrstka R. The role of the 3' untranslated region in post-transcriptional regulation of protein expression in mammalian cells. RNA Biol 2012; 9:563-76. [PMID: 22614827 DOI: 10.4161/rna.20231] [Citation(s) in RCA: 249] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The untranslated regions (UTRs) at the 3'end of mRNA transcripts contain important sequences that influence the fate of mRNA and thus proteosynthesis. In this review, we summarize the information known to date about 3'end processing, sequence characteristics including related binding proteins and the role of 3'UTRs in several selected signaling pathways to delineate their importance in the regulatory processes in mammalian cells. In addition to reviewing recent advances in the more well known aspects, such as cleavage and polyadenylation processes that influence mRNA stability and location, we concentrate on some newly emerging concepts of the role of the 3'UTR, including alternative polyadenylation sites in relation to proliferation and differentiation and the recognition of the multi-functional properties of non-coding RNAs, including miRNAs that commonly target the 3'UTR. The emerging picture is of a highly complex set of regulatory systems that include autoregulation, cooperativity and competition to fine tune proteosynthesis in context-dependent manners.
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Hossain S, de la Cruz-Morcillo MA, Sanchez-Prieto R, Almazan G. Mitogen-activated protein kinase p38 regulates krox-20 to direct schwann cell differentiation and peripheral myelination. Glia 2012; 60:1130-44. [DOI: 10.1002/glia.22340] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Accepted: 03/16/2012] [Indexed: 12/24/2022]
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50
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Sanduja S, Blanco FF, Dixon DA. The roles of TTP and BRF proteins in regulated mRNA decay. WILEY INTERDISCIPLINARY REVIEWS-RNA 2012; 2:42-57. [PMID: 21278925 DOI: 10.1002/wrna.28] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Adenylate- and uridylate-rich element (ARE) motifs are cis-acting elements present in the 3′ untranslated region of mRNA transcripts that encode many inflammation- and cancer-associated genes. The TIS11 family of RNA-binding proteins, composed of tristetraprolin (TTP) and butyrate response factors 1 and 2 (BRF-1 and -2), plays a critical role in regulating the expression of ARE-containing mRNAs. Through their ability to bind and target ARE-containing mRNAs for rapid degradation, this class of RNA-binding proteins serves a fundamental role in limiting the expression of a number of critical genes, thereby exerting anti-inflammatory and anti-cancer effects. Regulation of TIS11 family members occurs on a number of levels through cellular signaling events to control their transcription, mRNA turnover, phosphorylation status, cellular localization, association with other proteins, and proteosomal degradation, all of which impact TIS11 members' ability to promote ARE-mediated mRNA decay along with decay-independent functions. This review summarizes our current understanding of posttranscriptional regulation of ARE-containing gene expression by TIS11 family members and discusses their role in maintaining normal physiological processes and the pathological consequences in their absence.
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Affiliation(s)
- Sandhya Sanduja
- Department of Biological Sciences and Cancer Research Center, University of South Carolina, Columbia, SC, USA
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