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Fu Q, Li Y, Shi C. HSPB1 as an RNA-binding protein mediates the pathological process of osteoarthritis. J Orthop Surg Res 2024; 19:156. [PMID: 38429742 PMCID: PMC10908047 DOI: 10.1186/s13018-024-04580-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Accepted: 01/25/2024] [Indexed: 03/03/2024] Open
Abstract
Heat-shock protein beta1 (HSPB1) is a member of the small HSP family, downregulated in osteoarthritis (OA) chondrocytes and demonstrated the capacity to serve as an RNA-binding protein (RBP). This work aimed to explore the profile of HSPB1 bound RNA and reveal the potential regulation mechanism of HSPB1 in OA. In this work, we captured an unbiased HSPB1-RNA interaction map in Hela cells using the iRIP-seq. The results demonstrated that HSPB1 interacted with plentiful of mRNAs and genomic location toward the CDS region. Functional enrichment of HSPB1-related peaks showed the involvement in gene expression, translation initiation, cellular protein metabolic process, and nonsense-mediated decay. HOMER software analysis showed that HSPB1 bound peaks were over-represented in GAGGAG sequences. In addition, ABLIRC and CIMS algorithm indicated that HSPB1 bound to AU-rich motifs and the proportion of AU-rich peaks in 3' UTR were slightly higher than that in other regions. Moreover, HSPB1-binding targets analysis revealed several gens were associated with OA including EGFR, PLEC, COL5A1, and ROR2. The association of OA-related mRNAs to HSPB1 was additionally confirmed in OA tissues by the quantitative RIP-PCR experiments. Further experiment demonstrated the downregulation of HSPB1 in OA tissues. In conclusion, our current study confirmed HSPB1 as an RNA-binding protein and revealed its potential function in the pathological process of OA, providing a reliable insight to further investigate the molecular regulation mechanism of HSPB1 in OA.
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Affiliation(s)
- Qiang Fu
- Department of Rheumatology and Immunology, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang, 330006, Jiangxi, China
| | - Yi Li
- Department of Rheumatology and Immunology, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang, 330006, Jiangxi, China
| | - Chunhua Shi
- Department of Rheumatology and Immunology, Jiangxi Provincial People's Hospital, The First Affiliated Hospital of Nanchang Medical College, Nanchang, 330006, Jiangxi, China.
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Abedeera SM, Davila-Calderon J, Haddad C, Henry B, King J, Penumutchu S, Tolbert BS. The Repurposing of Cellular Proteins during Enterovirus A71 Infection. Viruses 2023; 16:75. [PMID: 38257775 PMCID: PMC10821071 DOI: 10.3390/v16010075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 12/27/2023] [Accepted: 12/29/2023] [Indexed: 01/24/2024] Open
Abstract
Viruses pose a great threat to people's lives. Enterovirus A71 (EV-A71) infects children and infants all over the world with no FDA-approved treatment to date. Understanding the basic mechanisms of viral processes aids in selecting more efficient drug targets and designing more effective antivirals to thwart this virus. The 5'-untranslated region (5'-UTR) of the viral RNA genome is composed of a cloverleaf structure and an internal ribosome entry site (IRES). Cellular proteins that bind to the cloverleaf structure regulate viral RNA synthesis, while those that bind to the IRES also known as IRES trans-acting factors (ITAFs) regulate viral translation. In this review, we survey the cellular proteins currently known to bind the 5'-UTR and influence viral gene expression with emphasis on comparing proteins' functions and localizations pre- and post-(EV-A71) infection. A comprehensive understanding of how the host cell's machinery is hijacked and reprogrammed by the virus to facilitate its replication is crucial for developing effective antivirals.
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Affiliation(s)
- Sudeshi M. Abedeera
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (S.M.A.); (B.H.); (S.P.)
| | - Jesse Davila-Calderon
- Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA; (J.D.-C.); (C.H.); (J.K.)
| | - Christina Haddad
- Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA; (J.D.-C.); (C.H.); (J.K.)
| | - Barrington Henry
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (S.M.A.); (B.H.); (S.P.)
| | - Josephine King
- Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA; (J.D.-C.); (C.H.); (J.K.)
| | - Srinivasa Penumutchu
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (S.M.A.); (B.H.); (S.P.)
| | - Blanton S. Tolbert
- Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; (S.M.A.); (B.H.); (S.P.)
- Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA
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Palacios-Luna JE, López-Marrufo MV, Bautista-Bautista G, Velarde-Guerra CS, Villeda-Gabriel G, Flores-Herrera O, Osorio-Caballero M, Aguilar-Carrasco JC, Palafox-Vargas ML, García-López G, Díaz-Ruíz O, Arechavaleta-Velasco F, Flores-Herrera H. Progesterone modulates extracellular heat-shock proteins and interlukin-1β in human choriodecidual after Escherichia coli infection. Placenta 2023; 142:85-94. [PMID: 37659254 DOI: 10.1016/j.placenta.2023.08.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 08/25/2023] [Accepted: 08/27/2023] [Indexed: 09/04/2023]
Abstract
INTRODUCTION Chorioamnionitis is an adverse condition in human pregnancy caused by many bacterial pathogens including Escherichia coli (E. coli); which has been associated with higher risk of preterm birth. We recently reported that human maternal decidua (MDec) tissue responds to E. coli infection by secreting extracellular heat-shock proteins (eHsp)-60, -70 and interlukin-1β (IL-1β). Previous studies have shown that progesterone (P4) regulates the immune response, but it is unknown whether P4 inhibits the secretion of eHsp. The aim of this investigation was to determine the role of P4 on the secretion of eHsp-27, -60, -70 and IL-1β in MDec after 3, 6, and 24 h of E. coli infection. METHODS Nine human feto-maternal interface (HFMi) tissues were included and mounted in the Transwell culture system. Only the maternal decidua (MDec) was stimulated for 3, 6 and 24 h with E. coli alone or in combination with progesterone and RU486. After each treatment, the HFMi tissue was recovered to determine histological changes and the culture medium recovered to evaluate the levels of eHsp-27, -60, -70 and IL-1β by ELISA and mRNA expression by RT-PCR. RESULTS No structural changes were observed in the HFMi tissue treated with P4 and RU486. However, stimulation with E. coli produces diffuse inflammation and ischemic necrosis. E. coli induced infection decreases, in time- and dose-dependent manner, eHsp-27 and increases eHsp-60, eHsp-70 and IL-1β levels. In contrast, incubation of HFMi tissue with E. coli + P4 reversed eHsp and IL-1β secretion levels relative to E. coli stimulation group but not relative to the control group. The same profile was observed on the expression of eHsp-27 and eHsp-60. DISCUSSION we found that progesterone modulates the anti-inflammatory (eHsp-27) and pro-inflammatory (eHsp-60 and eHsp-70) levels of eHsp induced by E. coli infection in human choriodecidual tissue. eHsp-60 and eHsp-70 levels were not completely reversed; maintaining the secretion of IL-1β, which has been associated with adverse events during pregnancy.
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Affiliation(s)
- Janelly Estefania Palacios-Luna
- Departamento de Inmunobioquímica. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Mariana Victoria López-Marrufo
- Departamento de Ginecología y Obstetricia. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Gerardo Bautista-Bautista
- Departamento de Inmunobioquímica. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Cinthia Selene Velarde-Guerra
- Departamento de Inmunobioquímica. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Graciela Villeda-Gabriel
- Departamento de Inmunología e Infectología, Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Oscar Flores-Herrera
- Departamento de Bioquímica, Facultad de Medicina. Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Mauricio Osorio-Caballero
- Departamento de Salud Sexual y Reproductiva. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Jose Carlos Aguilar-Carrasco
- Departamento de Fisiología y Desarrollo Celular, Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México. Mexico
| | - Martha Leticia Palafox-Vargas
- Departamento de Anatomía Patológica. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico
| | - Guadalupe García-López
- Departamento de Fisiología y Desarrollo Celular, Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México. Mexico
| | - Oscar Díaz-Ruíz
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Fabián Arechavaleta-Velasco
- Unidad de Investigación en Medicina Reproductiva. Hospital de Gineco-Obstetricia No. 4 "Luis Castelazo Ayala" Instituto Mexicano Del Seguro Social, Ciudad de México. Mexico.
| | - Hector Flores-Herrera
- Departamento de Inmunobioquímica. Instituto Nacional de Perinatología "Isidro Espinosa de Los Reyes" (INPerIER), Ciudad de México, Mexico.
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Okuda H, Miyamoto R, Takahashi S, Kawamura T, Ichikawa J, Harada I, Tamura T, Yokoyama A. RNA-binding proteins of KHDRBS and IGF2BP families control the oncogenic activity of MLL-AF4. Nat Commun 2022; 13:6688. [PMID: 36335100 PMCID: PMC9637093 DOI: 10.1038/s41467-022-34558-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 10/27/2022] [Indexed: 11/08/2022] Open
Abstract
Chromosomal translocation generates the MLL-AF4 fusion gene, which causes acute leukemia of multiple lineages. MLL-AF4 is a strong oncogenic driver that induces leukemia without additional mutations and is the most common cause of pediatric leukemia. However, establishment of a murine disease model via retroviral transduction has been difficult owning to a lack of understanding of its regulatory mechanisms. Here, we show that MLL-AF4 protein is post-transcriptionally regulated by RNA-binding proteins, including those of KHDRBS and IGF2BP families. MLL-AF4 translation is inhibited by ribosomal stalling, which occurs at regulatory sites containing AU-rich sequences recognized by KHDRBSs. Synonymous mutations disrupting the association of KHDRBSs result in proper translation of MLL-AF4 and leukemic transformation. Consequently, the synonymous MLL-AF4 mutant induces leukemia in vivo. Our results reveal that post-transcriptional regulation critically controls the oncogenic activity of MLL-AF4; these findings might be valuable in developing novel therapies via modulation of the activity of RNA-binding proteins.
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Affiliation(s)
- Hiroshi Okuda
- grid.272242.30000 0001 2168 5385Tsuruoka Metabolomics Laboratory, National Cancer Center, Tsuruoka, Yamagata Japan ,grid.268441.d0000 0001 1033 6139Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa Japan
| | - Ryo Miyamoto
- grid.272242.30000 0001 2168 5385Tsuruoka Metabolomics Laboratory, National Cancer Center, Tsuruoka, Yamagata Japan
| | - Satoshi Takahashi
- grid.272242.30000 0001 2168 5385Tsuruoka Metabolomics Laboratory, National Cancer Center, Tsuruoka, Yamagata Japan ,grid.258799.80000 0004 0372 2033Department of Hematology and Oncology, Kyoto University Graduate School of Medicine, Kyoto, Kyoto Japan
| | - Takeshi Kawamura
- grid.26999.3d0000 0001 2151 536XResearch Center for Advanced Science and Technology (RCAST), The University of Tokyo, Bunkyo, Tokyo Japan
| | - Juri Ichikawa
- grid.268441.d0000 0001 1033 6139Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa Japan
| | - Ibuki Harada
- grid.268441.d0000 0001 1033 6139Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa Japan
| | - Tomohiko Tamura
- grid.268441.d0000 0001 1033 6139Department of Immunology, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa Japan ,grid.268441.d0000 0001 1033 6139Advanced Medical Research Center, Yokohama City University, Yokohama, Kanagawa Japan
| | - Akihiko Yokoyama
- grid.272242.30000 0001 2168 5385Tsuruoka Metabolomics Laboratory, National Cancer Center, Tsuruoka, Yamagata Japan ,grid.272242.30000 0001 2168 5385National Cancer Center Research Institute, Chuo, Tokyo Japan
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Li S, Yang P. Relationship between HSPA1A-regulated gene expression and alternative splicing in mouse cardiomyocytes and cardiac hypertrophy. J Thorac Dis 2021; 13:5517-5533. [PMID: 34659818 PMCID: PMC8482330 DOI: 10.21037/jtd-21-1222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 08/30/2021] [Indexed: 11/30/2022]
Abstract
Background Cardiac hypertrophy may be classified as either physiological or pathological. Pathological hypertrophy has a complex etiology and is genetically regulated. In this study, we used a mouse model of cardiac hypertrophy to explore the mechanisms of gene regulation, in particular, modulation of the expression of target genes through transcription factor activity, regulation of immune and inflammation-associated genes and regulation of the alternative splicing of transcription factors. Methods Mouse models of pathological cardiac hypertrophy were established by transverse aortic constriction (TAC). We overexpressed HSPA1A in mouse cardiac HL-1 cells. GO and KEGG pathway annotation database was used to analyze all DEGs. Results The expression of HSPA1A differed significantly between TAC + dantrolene vs. sham + dantrolene (Sham was the non-TAC group, and DMSO was the contrast agent), and TAC + DMSO vs. sham + DMSO. The RNA-binding protein Zfp36 was found to be differentially expressed between both TAC + dantrolene vs. sham + dantrolene and TAC + DMSO vs. sham + DMSO. The expression of mki67 and gm5619 was significantly different between TAC + dantrolene and TAC + DMSO. HSPA1A was found to selectively regulate the expression of non-coding RNAs related to cardiac hypertrophy, including Rn7sk and RMRP. The downregulated genes were mainly related to inflammation and the immune response. HSPA1A negatively regulated alternative splicing of Asxl2 and positively regulated alternative splicing of Runx1. Conclusions HSPA1A was closely related to cardiac hypertrophy. Zfp36 was also related to cardiac hypertrophy. Dantrolene may delay cardiac hypertrophy and ventricular remodeling by regulating the expression of the RNA-binding protein genes mki67 and gm5619. HSPA1A positively regulated the expression of the non-coding RNAs RN7SK and RMRP while negatively regulating the expression of inflammation- and immune response-related genes. HSPA1A can play a role in cardiac hypertrophy by regulating the alternative splicing of asxl2 and runx1.
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Affiliation(s)
- Shuai Li
- Jilin Provincial Precision Medicine Key Laboratory for Cardiovascular Genetic Diagnosis, Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China
| | - Ping Yang
- Jilin Provincial Precision Medicine Key Laboratory for Cardiovascular Genetic Diagnosis, Department of Cardiology, China-Japan Union Hospital of Jilin University, Changchun, China
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Cvekl A, Eliscovich C. Crystallin gene expression: Insights from studies of transcriptional bursting. Exp Eye Res 2021; 207:108564. [PMID: 33894228 DOI: 10.1016/j.exer.2021.108564] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 03/05/2021] [Accepted: 03/22/2021] [Indexed: 01/26/2023]
Abstract
Cellular differentiation is marked by temporally and spatially regulated gene expression. The ocular lens is one of the most powerful mammalian model system since it is composed from only two cell subtypes, called lens epithelial and fiber cells. Lens epithelial cells differentiate into fiber cells through a series of spatially and temporally orchestrated processes, including massive production of crystallins, cellular elongation and the coordinated degradation of nuclei and other organelles. Studies of transcriptional and posttranscriptional gene regulatory mechanisms in lens provide a wide range of opportunities to understand global molecular mechanisms of gene expression as steady-state levels of crystallin mRNAs reach very high levels comparable to globin genes in erythrocytes. Importantly, dysregulation of crystallin gene expression results in lens structural abnormalities and cataracts. The mRNA life cycle is comprised of multiple stages, including transcription, splicing, nuclear export into cytoplasm, stabilization, localization, translation and ultimate decay. In recent years, development of modern mRNA detection methods with single molecule and single cell resolution enabled transformative studies to visualize the mRNA life cycle to generate novel insights into the sequential regulatory mechanisms of gene expression during embryogenesis. This review is focused on recent major advancements in studies of transcriptional bursting in differentiating lens fiber cells, analysis of nascent mRNA expression from bi-directional promoters, transient nuclear accumulation of specific mRNAs, condensation of chromatin prior lens fiber cell denucleation, and outlines future studies to probe the interactions of individual mRNAs with specific RNA-binding proteins (RBPs) in the cytoplasm and regulation of translation and mRNA decay.
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Affiliation(s)
- Ales Cvekl
- Department of Ophthalmology and VIsual Sciences, Albert Einstein College of Medicine, Bronx, NY, 10461, USA; Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, 10461, USA.
| | - Carolina Eliscovich
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY, 10461, USA; Department of Anatomy and Structural Biology, Albert Einstein College of Medicine, Bronx, NY, 10461, USA
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Kwon SM, Min S, Jeoun U, Sim MS, Jung GH, Hong SM, Jee BA, Woo HG, Lee C, Yoon G. Global spliceosome activity regulates entry into cellular senescence. FASEB J 2020; 35:e21204. [DOI: 10.1096/fj.202000395rr] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 11/03/2020] [Accepted: 11/03/2020] [Indexed: 12/30/2022]
Affiliation(s)
- So Mee Kwon
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Physiology Ajou University School of Medicine Suwon Korea
| | - Seongki Min
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
| | - Un‐woo Jeoun
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
| | - Min Seok Sim
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
| | - Gu Hyun Jung
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
| | - Sun Mi Hong
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
| | - Byul A. Jee
- Department of Physiology Ajou University School of Medicine Suwon Korea
| | - Hyun Goo Woo
- Department of Physiology Ajou University School of Medicine Suwon Korea
| | - Changhan Lee
- USC Leonard Davis School of Gerontology Los Angeles CA USA
| | - Gyesoon Yoon
- Department of Biochemistry Ajou University School of Medicine Suwon Korea
- Department of Biomedical Sciences (BK21 Plus) Ajou University School of Medicine Suwon Korea
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Barnum CE, Al Saai S, Patel SD, Cheng C, Anand D, Xu X, Dash S, Siddam AD, Glazewski L, Paglione E, Polson SW, Chuma S, Mason RW, Wei S, Batish M, Fowler VM, Lachke SA. The Tudor-domain protein TDRD7, mutated in congenital cataract, controls the heat shock protein HSPB1 (HSP27) and lens fiber cell morphology. Hum Mol Genet 2020; 29:2076-2097. [PMID: 32420594 PMCID: PMC7390939 DOI: 10.1093/hmg/ddaa096] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 04/10/2020] [Accepted: 05/12/2020] [Indexed: 12/13/2022] Open
Abstract
Mutations of the RNA granule component TDRD7 (OMIM: 611258) cause pediatric cataract. We applied an integrated approach to uncover the molecular pathology of cataract in Tdrd7-/- mice. Early postnatal Tdrd7-/- animals precipitously develop cataract suggesting a global-level breakdown/misregulation of key cellular processes. High-throughput RNA sequencing integrated with iSyTE-bioinformatics analysis identified the molecular chaperone and cytoskeletal modulator, HSPB1, among high-priority downregulated candidates in Tdrd7-/- lens. A protein fluorescence two-dimensional difference in-gel electrophoresis (2D-DIGE)-coupled mass spectrometry screen also identified HSPB1 downregulation, offering independent support for its importance to Tdrd7-/- cataractogenesis. Lens fiber cells normally undergo nuclear degradation for transparency, posing a challenge: how is their cell morphology, also critical for transparency, controlled post-nuclear degradation? HSPB1 functions in cytoskeletal maintenance, and its reduction in Tdrd7-/- lens precedes cataract, suggesting cytoskeletal defects may contribute to Tdrd7-/- cataract. In agreement, scanning electron microscopy (SEM) revealed abnormal fiber cell morphology in Tdrd7-/- lenses. Further, abnormal phalloidin and wheat germ agglutinin (WGA) staining of Tdrd7-/- fiber cells, particularly those exhibiting nuclear degradation, reveals distinct regulatory mechanisms control F-actin cytoskeletal and/or membrane maintenance in post-organelle degradation maturation stage fiber cells. Indeed, RNA immunoprecipitation identified Hspb1 mRNA in wild-type lens lysate TDRD7-pulldowns, and single-molecule RNA imaging showed co-localization of TDRD7 protein with cytoplasmic Hspb1 mRNA in differentiating fiber cells, suggesting that TDRD7-ribonucleoprotein complexes may be involved in optimal buildup of key factors. Finally, Hspb1 knockdown in Xenopus causes eye/lens defects. Together, these data uncover TDRD7's novel upstream role in elevation of stress-responsive chaperones for cytoskeletal maintenance in post-nuclear degradation lens fiber cells, perturbation of which causes early-onset cataracts.
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Affiliation(s)
- Carrie E Barnum
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Salma Al Saai
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Shaili D Patel
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Catherine Cheng
- School of Optometry, Indiana University, Bloomington, IN 47405, USA
| | - Deepti Anand
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Xiaolu Xu
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Soma Dash
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Archana D Siddam
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Lisa Glazewski
- Nemours Biomedical Research Department, Alfred I duPont Hospital for Children, Wilmington, DE 19803, USA
| | - Emily Paglione
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Shawn W Polson
- Center for Bioinformatics & Computational Biology, University of Delaware, Newark, DE 19716, USA
| | - Shinichiro Chuma
- Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| | - Robert W Mason
- Nemours Biomedical Research Department, Alfred I duPont Hospital for Children, Wilmington, DE 19803, USA
| | - Shuo Wei
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Mona Batish
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
- Department of Medical and Molecular Sciences, University of Delaware, Newark, DE 19716, USA
| | - Velia M Fowler
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
| | - Salil A Lachke
- Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA
- Center for Bioinformatics & Computational Biology, University of Delaware, Newark, DE 19716, USA
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Uchida Y, Chiba T, Kurimoto R, Asahara H. Post-transcriptional regulation of inflammation by RNA-binding proteins via cis-elements of mRNAs. J Biochem 2019; 166:375-382. [PMID: 31511872 DOI: 10.1093/jb/mvz067] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 08/26/2019] [Indexed: 12/18/2022] Open
Abstract
In human genome, there are approximately 1,500 RNA-binding proteins (RBPs). They can regulate mRNA stability or translational efficiency via ribosomes and these processes are known as 'post-transcriptional regulation'. Accumulating evidences indicate that post-transcriptional regulation is the determinant of the accurate levels of cytokines mRNAs. While transcriptional regulation of cytokines mRNAs has been well studied and found to be important for the rapid induction of mRNA and regulation of the acute phase of inflammation, post-transcriptional regulation by RBPs is essential for resolving inflammation in the later phase, and their dysfunction may lead to severe autoimmune diseases such as rheumatoid arthritis or systemic lupus erythematosus. For post-transcriptional regulation, RBPs recognize and directly bind to cis-regulatory elements in 3' untranslated region of mRNAs such as AU-rich or constitutive decay elements and play various roles. In this review, we summarize the recent findings regarding the role of RBPs in the regulation of inflammation.
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Affiliation(s)
- Yutaro Uchida
- Department of Systems BioMedicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomoki Chiba
- Department of Systems BioMedicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Ryota Kurimoto
- Department of Systems BioMedicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hiroshi Asahara
- Department of Systems BioMedicine, Tokyo Medical and Dental University, Tokyo, Japan
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Otsuka H, Fukao A, Funakami Y, Duncan KE, Fujiwara T. Emerging Evidence of Translational Control by AU-Rich Element-Binding Proteins. Front Genet 2019; 10:332. [PMID: 31118942 PMCID: PMC6507484 DOI: 10.3389/fgene.2019.00332] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 03/28/2019] [Indexed: 12/27/2022] Open
Abstract
RNA-binding proteins (RBPs) are key regulators of posttranscriptional gene expression and control many important biological processes including cell proliferation, development, and differentiation. RBPs bind specific motifs in their target mRNAs and regulate mRNA fate at many steps. The AU-rich element (ARE) is one of the major cis-regulatory elements in the 3′ untranslated region (UTR) of labile mRNAs. Many of these encode factors requiring very tight regulation, such as inflammatory cytokines and growth factors. Disruption in the control of these factors’ expression can cause autoimmune diseases, developmental disorders, or cancers. Therefore, these mRNAs are strictly regulated by various RBPs, particularly ARE-binding proteins (ARE-BPs). To regulate mRNA metabolism, ARE-BPs bind target mRNAs and affect some factors on mRNAs directly, or recruit effectors, such as mRNA decay machinery and protein kinases to target mRNAs. Importantly, some ARE-BPs have stabilizing roles, whereas others are destabilizing, and ARE-BPs appear to compete with each other when binding to target mRNAs. The function of specific ARE-BPs is modulated by posttranslational modifications (PTMs) including methylation and phosphorylation, thereby providing a means for cellular signaling pathways to regulate stability of specific target mRNAs. In this review, we summarize recent studies which have revealed detailed molecular mechanisms of ARE-BP-mediated regulation of gene expression and also report on the importance of ARE-BP function in specific physiological contexts and how this relates to disease. We also propose an mRNP regulatory network based on competition between stabilizing ARE-BPs and destabilizing ARE-BPs.
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Affiliation(s)
- Hiroshi Otsuka
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan
| | | | | | - Kent E Duncan
- University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Direct and Indirect Effects on Viral Translation and RNA Replication Are Required for AUF1 Restriction of Enterovirus Infections in Human Cells. mBio 2018; 9:mBio.01669-18. [PMID: 30181254 PMCID: PMC6123441 DOI: 10.1128/mbio.01669-18] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Picornaviruses primarily infect the gastrointestinal or upper respiratory tracts of humans and animals and may disseminate to tissues of the central nervous system, heart, skin, liver, or pancreas. Many common human pathogens belong to the Picornaviridae family, which includes viruses known to cause paralytic poliomyelitis (poliovirus); myocarditis (coxsackievirus B3 [CVB3]); the common cold (human rhinovirus [HRV]); and hand, foot, and mouth disease (enterovirus 71 [EV71]), among other illnesses. There are no specific treatments for infection, and vaccines exist for only two picornaviruses: poliovirus and hepatitis A virus. Given the worldwide distribution and prevalence of picornaviruses, it is important to gain insight into the host mechanisms used to restrict infection. Other than proteins involved in the innate immune response, few host factors have been identified that restrict picornavirus replication. The work presented here seeks to define the mechanism of action for the host restriction factor AUF1 during infection by poliovirus and CVB3. The cellular mRNA decay protein AUF1 acts as a restriction factor during infection by picornaviruses, including poliovirus, coxsackievirus, and human rhinovirus. AUF1 relocalizes from the nucleus to the cytoplasm during infection by these viruses due to the disruption of nucleocytoplasmic trafficking by viral proteinases. Previous studies have demonstrated that AUF1 binds to poliovirus and coxsackievirus B3 (CVB3) RNA during infection, with binding shown to occur within the internal ribosome entry site (IRES) of the 5′ noncoding region (NCR) or the 3′ NCR, respectively. Binding to different sites within the viral RNA suggests that AUF1 may negatively regulate infection by these viruses using different mechanisms. The work presented here addresses the mechanism of AUF1 inhibition of the replication of poliovirus and CVB3. We demonstrate that AUF1 knockdown in human cells results in increased viral translation, RNA synthesis, and virus production. AUF1 is shown to negatively regulate translation of a poliovirus and CVB3 IRES reporter RNA during infection but not in uninfected cells. We found that this inhibitory activity is not mediated through destabilization of viral genomic RNA; however, it does require virus-induced relocalization of AUF1 from the nucleus to the cytoplasm during the early phases of infection. Our findings suggest that AUF1 restriction of poliovirus and CVB3 replication uses a common mechanism through the viral IRES, which is distinct from the canonical role that AUF1 plays in regulated mRNA decay in uninfected host cells.
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12
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Breed ER, Hilliard CA, Yoseph B, Mittal R, Liang Z, Chen CW, Burd EM, Brewster LP, Hansen LM, Gleason RL, Pandita TK, Ford ML, Hunt CR, Coopersmith CM. The small heat shock protein HSPB1 protects mice from sepsis. Sci Rep 2018; 8:12493. [PMID: 30131526 PMCID: PMC6104051 DOI: 10.1038/s41598-018-30752-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 05/01/2018] [Indexed: 12/29/2022] Open
Abstract
In vitro studies have implicated the small heat shock protein HSPB1 in a range of physiological functions. However, its in vivo relevance is unclear as the phenotype of unstressed HSPB1−/− mice is unremarkable. To determine the impact of HSPB1 in injury, HSPB1−/− and wild type (WT) mice were subjected to cecal ligation and puncture, a model of polymicrobial sepsis. Ten-day mortality was significantly higher in HSPB1−/− mice following the onset of sepsis (65% vs. 35%). Ex vivo mechanical testing revealed that common carotid arteries from HSPB1−/− mice were more compliant than those in WT mice over pressures of 50–120 mm Hg. Septic HSPB1−/− mice also had increased peritoneal levels of IFN-γ and decreased systemic levels of IL-6 and KC. There were no differences in frequency of either splenic CD4+ or CD8+ T cells, nor were there differences in apoptosis in either cell type. However, splenic CD4+ T cells and CD8+ T cells from HSPB1−/− mice produced significantly less TNF and IL-2 following ex vivo stimulation. Systemic and local bacterial burden was similar in HSPB1−/− and WT mice. Thus while HSPB1−/− mice are uncompromised under basal conditions, HSPB1 has a critical function in vivo in sepsis, potentially mediated through alterations in arterial compliance and the immune response.
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Affiliation(s)
- Elise R Breed
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Carolyn A Hilliard
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Benyam Yoseph
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Rohit Mittal
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Zhe Liang
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Ching-Wen Chen
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Eileen M Burd
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Luke P Brewster
- Department of Surgery, Division of Vascular Surgery, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Laura M Hansen
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, Georgia
| | - Rudolph L Gleason
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, Georgia
| | - Tej K Pandita
- Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO, USA
| | - Mandy L Ford
- Department of Surgery and Emory Transplant Center, Emory University School of Medicine, Atlanta, GA, Georgia
| | - Clayton R Hunt
- Department of Radiation Oncology, The Houston Methodist Research Institute, Houston, TX, USA
| | - Craig M Coopersmith
- Department of Surgery and Emory Critical Care Center, Emory University School of Medicine, Atlanta, GA, Georgia.
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13
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Gupta M, Kaur G. Withania somnifera as a Potential Anxiolytic and Anti-inflammatory Candidate Against Systemic Lipopolysaccharide-Induced Neuroinflammation. Neuromolecular Med 2018; 20:343-362. [DOI: 10.1007/s12017-018-8497-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 05/24/2018] [Indexed: 12/14/2022]
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14
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Zheng G, Zhang Z, Liu H, Xiong Y, Luo L, Jia X, Peng C, Zhang Q, Li N, Gu Y, Lu M, Song Y, Pan H, Liu J, Liu W, He Z. HSP27-Mediated Extracellular and Intracellular Signaling Pathways Synergistically Confer Chemoresistance in Squamous Cell Carcinoma of Tongue. Clin Cancer Res 2017; 24:1163-1175. [PMID: 29246940 DOI: 10.1158/1078-0432.ccr-17-2619] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 11/06/2017] [Accepted: 12/11/2017] [Indexed: 11/16/2022]
Abstract
Purpose: Squamous cell carcinoma of tongue (SCCT) is the most common type of oral cavity carcinoma. Chemoresistance in SCCT is common, and the underlying mechanism remains largely unknown. We aimed to identify key molecules and signaling pathways mediating chemoresistance in SCCT.Experimental Design: Using a proteomic approach, we found that the HSP27 was a potential mediator for chemoresistance in SCCT cells. To further validate this role of HSP27, we performed various mechanistic studies using in vitro and in vivo models as well as serum and tissue samples from SCCT patients.Results: The HSP27 protein level was significantly increased in the multidrug-resistant SCCT cells and cell culture medium. Both HSP27 knockdown and anti-HSP27 antibody treatment reversed chemoresistance. Inversely, both HSP27 overexpression and recombinant human HSP27 protein treatment enhanced chemoresistance. Moreover, chemotherapy significantly induced HSP27 protein expression in both SCCT cells and their culture medium, as well as in tumor tissues and serum of SCCT patients. HSP27 overexpression predicts a poor outcome for SCCT patients receiving chemotherapy. Mechanically, extracellular HSP27 binds to TLR5 and then activates NF-κB signaling to maintain SCCT cell survival. TLR5 knockdown or restored IκBα protein level disrupts extracellular HSP27-induced NF-κB transactivation and chemoresistance. Moreover, intracellular HSP27 binds to BAX and BIM to repress their translocation to mitochondrion and subsequent cytochrome C release upon chemotherapy, resulting in inhibition of the mitochondrial apoptotic pathway.Conclusions: HSP27 plays a pivotal role in chemoresistance of SCCT cells via a synergistic extracellular and intracellular signaling. HSP27 may represent a potential biomarker and therapeutic target for precision SCCT treatment. Clin Cancer Res; 24(5); 1163-75. ©2017 AACR.
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Affiliation(s)
- Guopei Zheng
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Zhijie Zhang
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Hao Liu
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Yan Xiong
- Guangzhou Institute of Snake Venom Research, School of Pharmaceutical Sciences, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Liyun Luo
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Xiaoting Jia
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Cong Peng
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Qiong Zhang
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Nan Li
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Yixue Gu
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Minying Lu
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Ying Song
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China
| | - Hao Pan
- Department of Oral and Maxillofacial Surgery, Xiangya Stomatological Hospital and School of Stomatology, Central South University, Changsha, Hunan, China
| | - Jinbao Liu
- Key Laboratory of Protein Modification and Degradation, Department of Pathophysiology, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Wanqing Liu
- Department of Pharmaceutical Sciences, Eugene Applebaum College of Pharmacy and Health Sciences; Department of Pharmacology, School of Medicine; Barbara Ann Karmanos Cancer Institute, Wayne State University, Detroit, Michigan.
| | - Zhimin He
- Affiliated Cancer Hospital and Institute of Guangzhou Medical University, Guangzhou Key Laboratory of "Translational Medicine on Malignant Tumor Treatment," Guangzhou, Guangdong, China.
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15
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Corsini E, Galbiati V, Papale A, Kummer E, Pinto A, Guaita A, Racchi M. The role of HSP27 in RACK1-mediated PKC activation in THP-1 cells. Immunol Res 2017; 64:940-50. [PMID: 27178349 DOI: 10.1007/s12026-016-8802-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Receptor for Activated C Kinase 1 (RACK1) pseudosubstrate is a commercially available peptide that directly activates protein kinase C-β (PKCβ). We have recently shown that RACK1 pseudosubstrate, alone or in combination with classical immune activators, results in increased cytokine production and CD86 upregulation in primary leukocytes. Furthermore, we demonstrated a role of PKCβ and RACK1 in chemical allergen-induced CD86 expression and IL-8 production in both THP-1 cells and primary human dendritic cells. Aim of this study was to shed light on the mechanisms underlying RACK1 pseudosubstrate-induced immune activation and to compare it to lipopolysaccharide (LPS). The human promyelocytic cell line THP-1 was used throughout the study. RACK1 pseudosubstrate induced rapid (5 min) and dose-related PKCβ activation as assessed by its membrane translocation. Among the proteins phosphorylated, we identified Hsp27. Both RACK1 pseudosubstrate and LPS induce its phosphorylation and release in culture medium. The release of Hsp27 induced by RACK1 pseudosubstrate was also confirmed in peripheral blood mononuclear cells. To evaluate the role of Hsp27 in RACK1 pseudosubstrate or LPS-induced cell activation, we conducted Hsp27 silencing and neutralization experiments. Both strategies confirmed the central role of Hsp27 in RACK1 pseudosubstrate or LPS-induced cell activation, as assessed by IL-8 production and upregulation of CD86.
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Affiliation(s)
- Emanuela Corsini
- Laboratory of Toxicology, DiSFeB, Università degli Studi di Milano, Milan, Italy
| | - Valentina Galbiati
- Laboratory of Toxicology, DiSFeB, Università degli Studi di Milano, Milan, Italy
| | - Angela Papale
- Laboratory of Toxicology, DiSFeB, Università degli Studi di Milano, Milan, Italy
| | - Elena Kummer
- Laboratory of Toxicology, DiSFeB, Università degli Studi di Milano, Milan, Italy
| | - Antonella Pinto
- Department of Drug Sciences - Pharmacology, University of Pavia, Viale Taramelli 14, 27100, Pavia, Italy
| | | | - Marco Racchi
- Department of Drug Sciences - Pharmacology, University of Pavia, Viale Taramelli 14, 27100, Pavia, Italy.
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Wattacheril J, Rose KL, Hill S, Lanciault C, Murray CR, Washington K, Williams B, English W, Spann M, Clements R, Abumrad N, Flynn CR. Non-alcoholic fatty liver disease phosphoproteomics: A functional piece of the precision puzzle. Hepatol Res 2017; 47:1469-1483. [PMID: 28258704 PMCID: PMC5583035 DOI: 10.1111/hepr.12885] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 01/27/2017] [Accepted: 02/28/2017] [Indexed: 12/24/2022]
Abstract
BACKGROUND Molecular signaling events associated with the necroinflammatory changes in nonalcoholic steatohepatitis (NASH) are not well understood. AIMS To understand the molecular basis of NASH, we evaluated reversible phosphorylation events in hepatic tissue derived from Class III obese subjects by phosphoproteomic means with the aim of highlighting key regulatory pathways that distinguish NASH from non-alcoholic fatty liver disease (also known as simple steatosis; SS). MATERIALS & METHODS Class III obese subjects undergoing bariatric surgery underwent liver biopsy (eight normal patients, eight with simple steatosis, and eight NASH patients). Our strategy was unbiased, comparing global differences in liver protein reversible phosphorylation events across the 24 subjects. RESULTS Of the 3078 phosphorylation sites assigned (2465 phosphoserine, 445 phosphothreonine, 165 phosphotyrosine), 53 were altered by a factor of 2 among cohorts, and of those, 12 were significantly increased or decreased by ANOVA (P < 0.05). DISCUSSION Statistical analyses of canonical signaling pathways identified carbohydrate metabolism and RNA post-transcriptional modification among the most over-represented networks. CONCLUSION Collectively, these results raise the possibility of abnormalities in carbohydrate metabolism as an important trigger for the development of NASH, in parallel with already established abnormalities in lipid metabolism.
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Affiliation(s)
- Julia Wattacheril
- Center for Liver Disease and Transplantation, College of Physicians and Surgeons, Columbia University Medical Center, New York, New York, United States of America
| | - Kristie L. Rose
- Mass Spectrometry Research Center, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Salisha Hill
- Mass Spectrometry Research Center, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Christian Lanciault
- Department of Pathology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Clark R. Murray
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Kay Washington
- Department of Pathology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Brandon Williams
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Wayne English
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Matthew Spann
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Ronald Clements
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Naji Abumrad
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Charles Robb Flynn
- Department of Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America,Corresponding author: Charles Flynn, PhD, Assistant Professor, Department of Surgery, Vanderbilt University, MRBIV Room 8465A, 2213 Garland Ave, Nashville, TN 37232,
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17
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Esnault S, Shen ZJ, Malter JS. Protein Translation and Signaling in Human Eosinophils. Front Med (Lausanne) 2017; 4:150. [PMID: 28971096 PMCID: PMC5609579 DOI: 10.3389/fmed.2017.00150] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 09/01/2017] [Indexed: 01/01/2023] Open
Abstract
We have recently reported that, unlike IL-5 and GM-CSF, IL-3 induces increased translation of a subset of mRNAs. In addition, we have demonstrated that Pin1 controls the activity of mRNA binding proteins, leading to enhanced mRNA stability, GM-CSF protein production and prolonged eosinophil (EOS) survival. In this review, discussion will include an overview of cap-dependent protein translation and its regulation by intracellular signaling pathways. We will address the more general process of mRNA post-transcriptional regulation, especially regarding mRNA binding proteins, which are critical effectors of protein translation. Furthermore, we will focus on (1) the roles of IL-3-driven sustained signaling on enhanced protein translation in EOS, (2) the mechanisms regulating mRNA binding proteins activity in EOS, and (3) the potential targeting of IL-3 signaling and the signaling leading to mRNA binding activity changes to identify therapeutic targets to treat EOS-associated diseases.
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Affiliation(s)
- Stephane Esnault
- Department of Medicine, Allergy, Pulmonary, and Critical Care Medicine Division, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, United States
| | - Zhong-Jian Shen
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - James S Malter
- Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX, United States
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18
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HSPB1 mutations causing hereditary neuropathy in humans disrupt non-cell autonomous protection of motor neurons. Exp Neurol 2017; 297:101-109. [PMID: 28797631 DOI: 10.1016/j.expneurol.2017.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 07/22/2017] [Accepted: 08/06/2017] [Indexed: 12/12/2022]
Abstract
Heat shock protein beta-1 (HSPB1), is a ubiquitously expressed, multifunctional protein chaperone. Mutations in HSPB1 result in the development of a late-onset, distal hereditary motor neuropathy type II (dHMN) and axonal Charcot-Marie Tooth disease with sensory involvement (CMT2F). The functional consequences of HSPB1 mutations associated with hereditary neuropathy are unknown. HSPB1 also displays neuroprotective properties in many neuronal disease models, including the motor neuron disease amyotrophic lateral sclerosis (ALS). HSPB1 is upregulated in SOD1-ALS animal models during disease progression, predominately in glial cells. Glial cells are known to contribute to motor neuron loss in ALS through a non-cell autonomous mechanism. In this study, we examined the non-cell autonomous role of wild type and mutant HSPB1 in an astrocyte-motor neuron co-culture model system of ALS. Astrocyte-specific overexpression of wild type HSPB1 was sufficient to attenuate SOD1(G93A) astrocyte-mediated toxicity in motor neurons, whereas, overexpression of mutHSPB1 failed to ameliorate motor neuron toxicity. Expression of a phosphomimetic HSPB1 mutant in SOD1(G93A) astrocytes also reduced toxicity to motor neurons, suggesting that phosphorylation may contribute to HSPB1 mediated-neuroprotection. These data provide evidence that astrocytic HSPB1 expression may play a central role in motor neuron health and maintenance.
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19
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Hadadi E, Zhang B, Baidžajevas K, Yusof N, Puan KJ, Ong SM, Yeap WH, Rotzschke O, Kiss-Toth E, Wilson H, Wong SC. Differential IL-1β secretion by monocyte subsets is regulated by Hsp27 through modulating mRNA stability. Sci Rep 2016; 6:39035. [PMID: 27976724 PMCID: PMC5157043 DOI: 10.1038/srep39035] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 11/16/2016] [Indexed: 12/11/2022] Open
Abstract
Monocytes play a central role in regulating inflammation in response to infection or injury, and during auto-inflammatory diseases. Human blood contains classical, intermediate and non-classical monocyte subsets that each express characteristic patterns of cell surface CD16 and CD14; each subset also has specific functional properties, but the mechanisms underlying many of their distinctive features are undefined. Of particular interest is how monocyte subsets regulate secretion of the apical pro-inflammatory cytokine IL-1β, which is central to the initiation of immune responses but is also implicated in the pathology of various auto-immune/auto-inflammatory conditions. Here we show that primary human non-classical monocytes, exposed to LPS or LPS + BzATP (3'-O-(4-benzoyl)benzyl-ATP, a P2X7R agonist), produce approx. 80% less IL-1β than intermediate or classical monocytes. Despite their low CD14 expression, LPS-sensing, caspase-1 activation and P2X7R activity were comparable in non-classical monocytes to other subsets: their diminished ability to produce IL-1β instead arose from 50% increased IL-1β mRNA decay rates, mediated by Hsp27. These findings identify the Hsp27 pathway as a novel therapeutic target for the management of conditions featuring dysregulated IL-1β production, and represent an advancement in understanding of both physiological inflammatory responses and the pathogenesis of inflammatory diseases involving monocyte-derived IL-1β.
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Affiliation(s)
- Eva Hadadi
- University of Sheffield, Dept of Infection, Immunity &Cardiovascular Disease (IICD), Sheffield, UK.,Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Biyan Zhang
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Kajus Baidžajevas
- University of Sheffield, Dept of Infection, Immunity &Cardiovascular Disease (IICD), Sheffield, UK
| | - Nurhashikin Yusof
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Kia Joo Puan
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Siew Min Ong
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Wei Hseun Yeap
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Olaf Rotzschke
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
| | - Endre Kiss-Toth
- University of Sheffield, Dept of Infection, Immunity &Cardiovascular Disease (IICD), Sheffield, UK
| | - Heather Wilson
- University of Sheffield, Dept of Infection, Immunity &Cardiovascular Disease (IICD), Sheffield, UK
| | - Siew Cheng Wong
- Singapore Immunology Network (SIgN), Agency for Science, Technology and Research (ASTAR), Singapore
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20
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White EJF, Matsangos AE, Wilson GM. AUF1 regulation of coding and noncoding RNA. WILEY INTERDISCIPLINARY REVIEWS-RNA 2016; 8. [PMID: 27620010 DOI: 10.1002/wrna.1393] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 08/09/2016] [Accepted: 08/16/2016] [Indexed: 01/12/2023]
Abstract
AUF1 is a family of four RNA-binding proteins (RBPs) generated by alternative pre-messenger RNA (pre-mRNA) splicing, with canonical roles in controlling the stability and/or translation of mRNA targets based on recognition of AU-rich sequences within mRNA 3' untranslated regions. However, recent studies identifying AUF1 target sites across the transcriptome have revealed that these canonical functions are but a subset of its roles in posttranscriptional regulation of gene expression. In this review, we describe recent developments in our understanding of the RNA-binding properties of AUF1 together with their biochemical implications and roles in directing mRNA decay and translation. This is then followed by a survey of newly discovered activities for AUF1 proteins in control of miRNA synthesis and function, including miRNA assembly into microRNA (miRNA)-loaded RNA-induced silencing complexes (miRISCs), miRISC targeting to mRNA substrates, interplay with an expanding network of other cellular RBPs, and reciprocal regulatory relationships between miRNA and AUF1 synthesis. Finally, we discuss recently reported relationships between AUF1 and long noncoding RNAs and regulatory roles on viral RNA substrates. Cumulatively, these findings have significantly expanded our appreciation of the scope and diversity of AUF1 functions in the cell, and are prompting an exciting array of new questions moving forward. WIREs RNA 2017, 8:e1393. doi: 10.1002/wrna.1393 For further resources related to this article, please visit the WIREs website.
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Affiliation(s)
- Elizabeth J F White
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Aerielle E Matsangos
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Gerald M Wilson
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, MD, USA
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21
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The long noncoding RNA ASNR regulates degradation of Bcl-2 mRNA through its interaction with AUF1. Sci Rep 2016; 6:32189. [PMID: 27578251 PMCID: PMC5006016 DOI: 10.1038/srep32189] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 08/04/2016] [Indexed: 02/07/2023] Open
Abstract
The identification and characterization of long non-coding RNAs (lncRNAs) in diverse biological processes has recently developed rapidly. The large amounts of non-coding RNAs scale consistent with developmental complexity in eukaryotes, indicating that most of these transcripts may have functions in the regulation of biological processes and disorder in the organisms. In particular, Understanding of the overall biological significance of lncRNAs in cancers still remains limited. Here, we found a nuclear-retained lncRNA, termed Lnc_ASNR (apoptosis suppressing-noncoding RNA), which serves as a repressor of apoptosis. Lnc_ASNR was discovered in a set of microarray data derived from four kinds of tumor and adjacent normal tissue samples, and displayed significant up-regulation in the tumor tissues. Using an RNA-pull down assay, we found that Lnc_ASNR interacted with the protein ARE/poly (U)-binding/degradation factor 1(AUF1), which is reported to promote rapid degradation of the Bcl-2 mRNA, an inhibitor of apoptosis. Lnc_ASNR binds to AUFI in nucleus, decreasing the cytoplasmic proportion of AUF1 which targets the B-cell lymphoma-2 (Bcl-2) mRNA. Taken together, the overall effect of Lnc_ASNR expression is thus a decrease in cell apoptosis indicating that Lnc_ASNR may play a vital role in tumorigenesis and carcinogenesis.
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Toyama T, Abiko Y, Katayama Y, Kaji T, Kumagai Y. S-Mercuration of ubiquitin carboxyl-terminal hydrolase L1 through Cys152 by methylmercury causes inhibition of its catalytic activity and reduction of monoubiquitin levels in SH-SY5Y cells. J Toxicol Sci 2016; 40:887-93. [PMID: 26558469 DOI: 10.2131/jts.40.887] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Methylmercury (MeHg) is an environmental electrophile that covalently modifies cellular proteins. In this study, we identified proteins that undergo S-mercuration by MeHg. By combining two-dimensional SDS-PAGE, atomic absorption spectrometry and ultra performance liquid chromatography mass spectrometry (UPLC/MS/MS), we revealed that ubiquitin carboxyl-terminal hydrolase L1 (UCH-L1) is a target for S-mercuration in human neuroblastoma SH-SY5Y cells exposed to MeHg (1 µM, 9 hr). The modification site of UCH-L1 by MeHg was Cys152, as determined by matrix-assisted laser desorption ionization time-of-flight mass spectrometry. MeHg was shown to inhibit the catalytic activity of recombinant human UCH-L1 in a concentration-dependent manner. Knockdown of UCH-L1 indicated that this enzyme plays a critical role in regulating mono-ubiquitin (monoUb) levels in SH-SY5Y cells and exposure of SH-SY5Y cells to MeHg caused a reduction in the level of monoUb in these cells. These observations suggest that UCH-L1 readily undergoes S-mercuration by MeHg through Cys152 and this covalent modification inhibits UCH-L1, leading to the potential disruption of the maintenance of cellular monoUb levels.
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Kovarik P, Ebner F, Sedlyarov V. Posttranscriptional regulation of cytokine expression. Cytokine 2015; 89:21-26. [PMID: 26586165 DOI: 10.1016/j.cyto.2015.11.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 11/03/2015] [Indexed: 01/20/2023]
Abstract
Expression of cytokines and chemokines is regulated at multiple steps during the transfer of the genetic information from DNA sequence to the functional protein. The multilayered control of cytokine expression reflects the need of the immune system to precisely and rapidly adjust the magnitude and duration of immune responses to external cues. Common features of the regulation of cytokine expression are temporal and highly dynamic changes in cytokine mRNA stability. Failures in the timing and extent of mRNA decay can result in disease. Recent advances in transcriptome-wide approaches began to shed light into the complex network of cis-acting sequence elements and trans-acting factors controlling mRNA stability. These approaches led to the discovery of novel unexpected paradigms but they also revealed new questions. This review will discuss the control of cytokine mRNA stability both in the context of high content approaches as well as focused mechanistic studies and animal models. The article highlights the need for systems biology approaches as important means to understand how cytokine mRNA decay helps maintain the immune and tissue homeostasis, and to explore options for therapeutical exploitation of mRNA stability regulation.
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Affiliation(s)
- Pavel Kovarik
- Max F. Perutz Laboratories, University of Vienna, Dr. Bohr-Gasse 9, A-1030 Vienna, Austria.
| | - Florian Ebner
- Max F. Perutz Laboratories, University of Vienna, Dr. Bohr-Gasse 9, A-1030 Vienna, Austria
| | - Vitaly Sedlyarov
- Max F. Perutz Laboratories, University of Vienna, Dr. Bohr-Gasse 9, A-1030 Vienna, Austria
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Lin JY, Brewer G, Li ML. HuR and Ago2 Bind the Internal Ribosome Entry Site of Enterovirus 71 and Promote Virus Translation and Replication. PLoS One 2015; 10:e0140291. [PMID: 26451954 PMCID: PMC4599798 DOI: 10.1371/journal.pone.0140291] [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: 06/24/2015] [Accepted: 09/23/2015] [Indexed: 02/05/2023] Open
Abstract
EV71 (enterovirus 71) RNA contains an internal ribosomal entry site (IRES) that directs cap-independent initiation of translation. IRES-dependent translation requires the host’s translation initiation factors and IRES-associated trans-acting factors (ITAFs). We reported recently that mRNA decay factor AUF1 is a negative-acting ITAF that binds IRES stem-loop II. We also reported that the small RNA-processing enzyme Dicer produces at least four small RNAs (vsRNAs) from the EV71 IRES. One of these, vsRNA1, derived from IRES stem-loop II, reduces IRES activity and virus replication. Since its mechanism of action is unknown, we hypothesized that it might control association of ITAFs with the IRES. Here, we identified the mRNA stability factor HuR and the RISC subunit Argonaute 2 (Ago2) as two ITAFs that bind stem-loop II. In contrast to AUF1, HuR and Ago2 promote EV71 IRES activity and virus replication. In vitro RNA-binding assays revealed that vsRNA1 can alter association of Ago2, HuR, and AUF1 with stem-loop II. This presents a possible mechanism by which vsRNA1 could control viral translation and replication.
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Affiliation(s)
- Jing-Yi Lin
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Gary Brewer
- Department of Biochemistry & Molecular Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
| | - Mei-Ling Li
- Department of Biochemistry & Molecular Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
- * E-mail:
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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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Arrigo AP, Ducarouge B, Lavial F, Gibert B. Immense Cellular Implications Associated to Small Stress Proteins Expression: Impacts on Human Pathologies. HEAT SHOCK PROTEINS 2015. [DOI: 10.1007/978-3-319-16077-1_2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Dávila D, Jiménez-Mateos EM, Mooney CM, Velasco G, Henshall DC, Prehn JHM. Hsp27 binding to the 3'UTR of bim mRNA prevents neuronal death during oxidative stress-induced injury: a novel cytoprotective mechanism. Mol Biol Cell 2014; 25:3413-23. [PMID: 25187648 PMCID: PMC4214787 DOI: 10.1091/mbc.e13-08-0495] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Neurons face a changeable microenvironment and therefore need mechanisms that allow rapid switch on/off of their cytoprotective and apoptosis-inducing signaling pathways. Cellular mechanisms that control apoptosis activation include the regulation of pro/antiapoptotic mRNAs through their 3'-untranslated region (UTR). This region holds binding elements for RNA-binding proteins, which can control mRNA translation. Here we demonstrate that heat shock protein 27 (Hsp27) prevents oxidative stress-induced cell death in cerebellar granule neurons by specific regulation of the mRNA for the proapoptotic BH3-only protein, Bim. Hsp27 depletion induced by oxidative stress using hydrogen peroxide (H2O2) correlated with bim gene activation and subsequent neuronal death, whereas enhanced Hsp27 expression prevented these. This effect could not be explained by proteasomal degradation of Bim or bim promoter inhibition; however, it was associated with a specific increase in the levels of bim mRNA and with its binding to Hsp27. Finally, we determined that enhanced Hsp27 expression in neurons exposed to H2O2 or glutamate prevented the translation of a reporter plasmid where bim-3'UTR mRNA sequence was cloned downstream of a luciferase gene. These results suggest that repression of bim mRNA translation through binding to the 3'UTR constitutes a novel cytoprotective mechanism of Hsp27 during stress in neurons.
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Affiliation(s)
- David Dávila
- Department of Physiology and Medical Physics and RCSI Centre for the Study of Neurological Disorders, Royal College of Surgeons in Ireland, Dublin 2, Ireland Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, 28040 Madrid, Spain
| | - Eva M Jiménez-Mateos
- Department of Physiology and Medical Physics and RCSI Centre for the Study of Neurological Disorders, Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Claire M Mooney
- Department of Physiology and Medical Physics and RCSI Centre for the Study of Neurological Disorders, Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Guillermo Velasco
- Department of Biochemistry and Molecular Biology I, School of Biology, Complutense University, 28040 Madrid, Spain
| | - David C Henshall
- Department of Physiology and Medical Physics and RCSI Centre for the Study of Neurological Disorders, Royal College of Surgeons in Ireland, Dublin 2, Ireland
| | - Jochen H M Prehn
- Department of Physiology and Medical Physics and RCSI Centre for the Study of Neurological Disorders, Royal College of Surgeons in Ireland, Dublin 2, Ireland
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Lin JY, Li ML, Brewer G. mRNA decay factor AUF1 binds the internal ribosomal entry site of enterovirus 71 and inhibits virus replication. PLoS One 2014; 9:e103827. [PMID: 25077793 PMCID: PMC4117571 DOI: 10.1371/journal.pone.0103827] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 07/07/2014] [Indexed: 02/05/2023] Open
Abstract
AU-rich element binding factor 1 (AUF1) has a role in the replication cycles of different viruses. Here we demonstrate that AUF1 binds the internal ribosome entry site (IRES) of enterovirus 71 (EV71) and negatively regulates IRES-dependent translation. During EV71 infection, AUF1 accumulates in the cytoplasm where viral replication occurs, whereas AUF1 localizes predominantly in the nucleus in mock-infected cells. AUF1 knockdown in infected cells increases IRES activity and synthesis of viral proteins. Taken together, the results suggest that AUF1 interacts with the EV71 IRES to negatively regulate viral translation and replication.
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Affiliation(s)
- Jing-Yi Lin
- School of Medical Laboratory Science and Biotechnology, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Mei-Ling Li
- Department of Biochemistry & Molecular Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
| | - Gary Brewer
- Department of Biochemistry & Molecular Biology, Rutgers Robert Wood Johnson Medical School, Piscataway, New Jersey, United States of America
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Moore AE, Chenette DM, Larkin LC, Schneider RJ. Physiological networks and disease functions of RNA-binding protein AUF1. WILEY INTERDISCIPLINARY REVIEWS-RNA 2014; 5:549-64. [PMID: 24687816 DOI: 10.1002/wrna.1230] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 02/20/2014] [Accepted: 02/24/2014] [Indexed: 11/09/2022]
Abstract
Regulated messenger RNA (mRNA) decay is an essential mechanism that governs proper control of gene expression. In fact, many of the most physiologically potent proteins are encoded by short-lived mRNAs, many of which contain AU-rich elements (AREs) in their 3'-untranslated region (3'-UTR). AREs target mRNAs for post-transcriptional regulation, generally rapid decay, but also stabilization and translation inhibition. AREs control mRNA turnover and translation activities through association with trans-acting RNA-binding proteins that display high affinity for these AU-rich regulatory elements. AU-rich element RNA-binding protein (AUF1), also known as heterogeneous nuclear ribonucleoprotein D (HNRNPD), is an extensively studied AU-rich binding protein (AUBP). AUF1 has been shown to regulate ARE-mRNA turnover, primarily functioning to promote rapid ARE-mRNA degradation. In certain cellular contexts, AUF1 has also been shown to regulate gene expression at the translational and even the transcriptional level. AUF1 comprises a family of four related protein isoforms derived from a common pre-mRNA by differential exon splicing. AUF1 isoforms have been shown to display multiple and distinct functions that include the ability to target ARE-mRNA stability or decay, and transcriptional activation of certain genes that is controlled by their differential subcellular locations, expression levels, and post-translational modifications. AUF1 has been implicated in controlling a variety of physiological functions through its ability to regulate the expression of numerous mRNAs containing 3'-UTR AREs, thereby coordinating functionally related pathways. This review highlights the physiological functions of AUF1-mediated regulation of mRNA and gene expression, and the consequences of deficient AUF1 levels in different physiological settings.
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Affiliation(s)
- Ashleigh E Moore
- Alexandria Center for Life Sciences, New York University School of Medicine, New York, NY, USA
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Arrigo AP, Gibert B. HspB1, HspB5 and HspB4 in Human Cancers: Potent Oncogenic Role of Some of Their Client Proteins. Cancers (Basel) 2014; 6:333-65. [PMID: 24514166 PMCID: PMC3980596 DOI: 10.3390/cancers6010333] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/03/2014] [Accepted: 01/17/2014] [Indexed: 12/20/2022] Open
Abstract
Human small heat shock proteins are molecular chaperones that regulate fundamental cellular processes in normal unstressed cells as well as in many cancer cells where they are over-expressed. These proteins are characterized by cell physiology dependent changes in their oligomerization and phosphorylation status. These structural changes allow them to interact with many different client proteins that subsequently display modified activity and/or half-life. Nowdays, the protein interactomes of small Hsps are under intense investigations and will represent, when completed, key parameters to elaborate therapeutic strategies aimed at modulating the functions of these chaperones. Here, we have analyzed the potential pro-cancerous roles of several client proteins that have been described so far to interact with HspB1 (Hsp27) and its close members HspB5 (αB-crystallin) and HspB4 (αA-crystallin).
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Affiliation(s)
- André-Patrick Arrigo
- Apoptosis, Cancer and Development Laboratory, Lyon Cancer Research Center, INSERM U1052-CNRS UMR5286, Claude Bernard University Lyon 1, Lyon 69008, France.
| | - Benjamin Gibert
- Apoptosis, Cancer and Development Laboratory, Lyon Cancer Research Center, INSERM U1052-CNRS UMR5286, Claude Bernard University Lyon 1, Lyon 69008, France.
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Sun X, Zhou Z, Fink DJ, Mata M. HspB1 silences translation of PDZ-RhoGEF by enhancing miR-20a and miR-128 expression to promote neurite extension. Mol Cell Neurosci 2013; 57:111-9. [PMID: 24141048 DOI: 10.1016/j.mcn.2013.10.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/03/2013] [Accepted: 10/08/2013] [Indexed: 11/17/2022] Open
Abstract
HspB1 is a small heat shock protein implicated in neuronal survival and neurite growth; mutations in HspB1 have been identified in hereditary motor neuronopathies and Charcot Marie Tooth Type 2 neuropathies. In cortical neurons we found that expression of HspB1 decreased RhoA activity and RhoA-GTP protein, and reversed the inhibition of neurite extension induced by NogoA. HspB1 decreased PDZ-RhoGEF, a RhoA specific guanine nucleotide exchange factor, while other regulators of RhoA activity were unchanged. The decrease in PDZ-RhoGEF was independent of proteasomal or lysosomal degradation pathways and was not associated with changes in PDZ-RhoGEF mRNA. We sequenced the 3'UTR of rat PDZ-RhoGEF and found binding sites for miRNAs miR-20a, miR-128 and miR-132. Expression of these microRNAs was substantially increased in cortical neurons transfected with HspB1. Co-transfection of HspB1 with specific inhibitors of miR-20a or miR-128 prevented the decrease in PDZ-RhoGEF and blocked the neurite growth promoting effects of HspB1. Using the 3'UTR of PDZ-RhoGEF mRNA in a luciferase reporter construct we observed that HspB1, miR-20a and miR-128 each inhibited luciferase expression. We conclude that HspB1 regulates RhoA activity through modulation of PDZ-RhoGEF levels achieved by translational control through enhanced expression of specific miRNAs (miR-20a and miR-128). Regulation of RhoA activity by translational silencing of PDZ-RhoGEF may be the mechanism through which HspB1 is involved in regulation of neurite growth. As RhoA-GTPase plays a regulatory role in the organization and stability of cytoskeletal networks through its downstream effectors, the results suggest a possible mechanism linking HspB1 mutations and axonal cytoskeletal pathology.
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Affiliation(s)
- Xiankui Sun
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA; GRECC VA Ann Arbor Healthcare System, Ann Arbor, MI 48109, USA
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Krause CD, Izotova LS, Pestka S. Analytical use of multi-protein Fluorescence Resonance Energy Transfer to demonstrate membrane-facilitated interactions within cytokine receptor complexes. Cytokine 2013; 64:298-309. [PMID: 23769803 PMCID: PMC3770794 DOI: 10.1016/j.cyto.2013.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 05/17/2013] [Accepted: 05/18/2013] [Indexed: 12/17/2022]
Abstract
Experiments measuring Fluorescence Resonance Energy Transfer (FRET) between cytokine receptor chains and their associated proteins led to hypotheses describing their organization in intact cells. These interactions occur within a larger protein complex or within a given nano-environment. To illustrate this complexity empirically, we developed a protocol to analyze FRET among more than two fluorescent proteins (multi-FRET). In multi-FRET, we model FRET among more than two fluorophores as the sum of all possible pairwise interactions within the complex. We validated our assumption by demonstrating that FRET among pairs within a fluorescent triplet resembled FRET between each pair measured in the absence of the third fluorophore. FRET between two receptor chains increases with increasing FRET between the ligand-binding chain (e.g., IFN-γR1, IL-10R1 and IFN-λR1) and an acylated fluorescent protein that preferentially resides within subsections of the plasma membrane. The interaction of IL-10R2 with IFN-λR1 or IL-10R1 results in decreased FRET between IL-10R2 and the acylated fluorescent protein. Finally, we analyzed FRET among four fluorescent proteins to demonstrate that as FRET between IFN-γR1 and IFN-γR2 or between IFN-αR1 and IFN-αR2c increases, FRET among other pairs of proteins changes within each complex.
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Affiliation(s)
- Christopher D Krause
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855, USA.
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Krause CD, Digioia G, Izotova LS, Pestka S. Improving the spectral analysis of Fluorescence Resonance Energy Transfer in live cells: application to interferon receptors and Janus kinases. Cytokine 2013; 64:272-85. [PMID: 23796694 PMCID: PMC3868223 DOI: 10.1016/j.cyto.2013.05.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 04/22/2013] [Accepted: 05/29/2013] [Indexed: 01/21/2023]
Abstract
The observed Fluorescence Resonance Energy Transfer (FRET) between fluorescently labeled proteins varies in cells. To understand how this variation affects our interpretation of how proteins interact in cells, we developed a protocol that mathematically separates donor-independent and donor-dependent excitations of acceptor, determines the electromagnetic interaction of donors and acceptors, and quantifies the efficiency of the interaction of donors and acceptors. By analyzing large populations of cells, we found that misbalanced or insufficient expression of acceptor or donor as well as their inefficient or reversible interaction influenced FRET efficiency in vivo. Use of red-shifted donors and acceptors gave spectra with less endogenous fluorescence but produced lower FRET efficiency, possibly caused by reduced quenching of red-shifted fluorophores in cells. Additionally, cryptic interactions between jellyfish FPs artefactually increased the apparent FRET efficiency. Our protocol can distinguish specific and nonspecific protein interactions even within highly constrained environments as plasma membranes. Overall, accurate FRET estimations in cells or within complex environments can be obtained by a combination of proper data analysis, study of sufficient numbers of cells, and use of properly empirically developed fluorescent proteins.
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Affiliation(s)
- Christopher D Krause
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855, USA.
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Krause CD, Digioia G, Izotova LS, Xie J, Kim Y, Schwartz BJ, Mirochnitchenko OV, Pestka S. Ligand-independent interaction of the type I interferon receptor complex is necessary to observe its biological activity. Cytokine 2013; 64:286-97. [PMID: 23830819 PMCID: PMC3770802 DOI: 10.1016/j.cyto.2013.06.309] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 04/23/2013] [Accepted: 06/10/2013] [Indexed: 10/26/2022]
Abstract
Ectopic coexpression of the two chains of the Type I and Type III interferon (IFN) receptor complexes (IFN-αR1 and IFN-αR2c, or IFN-λR1 and IL-10R2) yielded sensitivity to IFN-alpha or IFN-lambda in only some cells. We found that IFN-αR1 and IFN-αR2c exhibit FRET only when expressed at equivalent and low levels. Expanded clonal cell lines expressing both IFN-αR1 and IFN-αR2c were sensitive to IFN-alpha only when IFN-αR1 and IFN-αR2c exhibited FRET in the absence of human IFN-alpha. Coexpression of RACK-1 or Jak1 enhanced the affinity of the interaction between IFN-αR1 and IFN-αR2c. Both IFN-αR1 and IFN-αR2c exhibited FRET with Jak1 and Tyk2. Together with data showing that disruption of the preassociation between the IFN-gamma receptor chains inhibited its biological activity, we propose that biologically active IFN receptors require ligand-independent juxtaposition of IFN receptor chains assisted by their associated cytosolic proteins.
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Affiliation(s)
- Christopher D. Krause
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Gina Digioia
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
- Pestka Biomedical Laboratories, 131 Ethel Road West, Suite 6, Piscataway, NJ 08854 USA
| | - Lara S. Izotova
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Junxia Xie
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Youngsun Kim
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Barbara J. Schwartz
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Olga V. Mirochnitchenko
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
| | - Sidney Pestka
- Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School - The University of Medicine and Dentistry of New Jersey, 675 Hoes Lane West, Piscataway, NJ 08855 USA
- Pestka Biomedical Laboratories, 131 Ethel Road West, Suite 6, Piscataway, NJ 08854 USA
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Zucconi BE, Wilson GM. Assembly of functional ribonucleoprotein complexes by AU-rich element RNA-binding protein 1 (AUF1) requires base-dependent and -independent RNA contacts. J Biol Chem 2013; 288:28034-48. [PMID: 23940053 DOI: 10.1074/jbc.m113.489559] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
AU-rich element RNA-binding protein 1 (AUF1) regulates the stability and/or translational efficiency of diverse mRNA targets, including many encoding products controlling the cell cycle, apoptosis, and inflammation by associating with AU-rich elements residing in their 3'-untranslated regions. Previous biochemical studies showed that optimal AUF1 binding requires 33-34 nucleotides with a strong preference for U-rich RNA despite observations that few AUF1-associated cellular mRNAs contain such extended U-rich domains. Using the smallest AUF1 isoform (p37(AUF1)) as a model, we employed fluorescence anisotropy-based approaches to define thermodynamic parameters describing AUF1 ribonucleoprotein (RNP) complex formation across a panel of RNA substrates. These data demonstrated that 15 nucleotides of AU-rich sequence were sufficient to nucleate high affinity p37(AUF1) RNP complexes within a larger RNA context. In particular, p37(AUF1) binding to short AU-rich RNA targets was significantly stabilized by interactions with a 3'-purine residue and largely base-independent but non-ionic contacts 5' of the AU-rich site. RNP stabilization by the upstream RNA domain was associated with an enhanced negative change in heat capacity consistent with conformational changes in protein and/or RNA components, and fluorescence resonance energy transfer-based assays demonstrated that these contacts were required for p37(AUF1) to remodel local RNA structure. Finally, reporter mRNAs containing minimal high affinity p37(AUF1) target sequences associated with AUF1 and were destabilized in a p37(AUF1)-dependent manner in cells. These findings provide a mechanistic explanation for the diverse population of AUF1 target mRNAs but also suggest how AUF1 binding could regulate protein and/or microRNA binding events at adjacent sites.
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Affiliation(s)
- Beth E Zucconi
- From the Department of Biochemistry and Molecular Biology and Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland 21201
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Uehata T, Akira S. mRNA degradation by the endoribonuclease Regnase-1/ZC3H12a/MCPIP-1. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2013; 1829:708-13. [DOI: 10.1016/j.bbagrm.2013.03.001] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 03/04/2013] [Accepted: 03/04/2013] [Indexed: 01/14/2023]
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Arrigo AP, Gibert B. Protein interactomes of three stress inducible small heat shock proteins: HspB1, HspB5 and HspB8. Int J Hyperthermia 2013; 29:409-22. [DOI: 10.3109/02656736.2013.792956] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Arrigo AP. Human small heat shock proteins: Protein interactomes of homo- and hetero-oligomeric complexes: An update. FEBS Lett 2013; 587:1959-69. [DOI: 10.1016/j.febslet.2013.05.011] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 05/02/2013] [Accepted: 05/02/2013] [Indexed: 10/26/2022]
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Moens U, Kostenko S, Sveinbjørnsson B. The Role of Mitogen-Activated Protein Kinase-Activated Protein Kinases (MAPKAPKs) in Inflammation. Genes (Basel) 2013; 4:101-33. [PMID: 24705157 PMCID: PMC3899974 DOI: 10.3390/genes4020101] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/18/2013] [Accepted: 03/20/2013] [Indexed: 01/18/2023] Open
Abstract
Mitogen-activated protein kinase (MAPK) pathways are implicated in several cellular processes including proliferation, differentiation, apoptosis, cell survival, cell motility, metabolism, stress response and inflammation. MAPK pathways transmit and convert a plethora of extracellular signals by three consecutive phosphorylation events involving a MAPK kinase kinase, a MAPK kinase, and a MAPK. In turn MAPKs phosphorylate substrates, including other protein kinases referred to as MAPK-activated protein kinases (MAPKAPKs). Eleven mammalian MAPKAPKs have been identified: ribosomal-S6-kinases (RSK1-4), mitogen- and stress-activated kinases (MSK1-2), MAPK-interacting kinases (MNK1-2), MAPKAPK-2 (MK2), MAPKAPK-3 (MK3), and MAPKAPK-5 (MK5). The role of these MAPKAPKs in inflammation will be reviewed.
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Affiliation(s)
- Ugo Moens
- Molecular Inflammation Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, NO-9037 Tromsø, Norway.
| | - Sergiy Kostenko
- Molecular Inflammation Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, NO-9037 Tromsø, Norway.
| | - Baldur Sveinbjørnsson
- Molecular Inflammation Research Group, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø, NO-9037 Tromsø, Norway.
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Hsp27 and F-box protein β-TrCP promote degradation of mRNA decay factor AUF1. Mol Cell Biol 2013; 33:2315-26. [PMID: 23530064 DOI: 10.1128/mcb.00931-12] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Activation of the mitogen-activated protein (MAP) pathway kinases p38 and MK2 induces phosphorylation of the chaperone Hsp27 and stabilization of mRNAs containing AU-rich elements (AREs) (ARE-mRNAs). Likewise, expression of phosphomimetic mutant forms of Hsp27 also stabilizes ARE-mRNAs. It appears to perform this function by promoting degradation of the ARE-mRNA decay factor AUF1 by proteasomes. In this study, we examined the molecular mechanism linking Hsp27 phosphorylation to AUF1 degradation by proteasomes. AUF1 is a target of β-TrCP, the substrate recognition subunit of the E3 ubiquitin ligase Skp1-cullin-F-box protein complex, SCF(β-TrCP). Depletion of β-TrCP stabilized AUF1. In contrast, overexpression of β-TrCP enhanced ubiquitination and degradation of AUF1 and led to stabilization of reporter mRNAs containing cytokine AREs. Enhanced AUF1 degradation required expression of phosphomimetic mutant forms of both Hsp27 and AUF1. Our results suggest that a signaling axis composed of p38 MAP kinase-MK2-Hsp27-β-TrCP may promote AUF1 degradation by proteasomes and stabilization of cytokine ARE-mRNAs.
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Wu X, Chesoni S, Rondeau G, Tempesta C, Patel R, Charles S, Daginawala N, Zucconi BE, Kishor A, Xu G, Shi Y, Li ML, Irizarry-Barreto P, Welsh J, Wilson GM, Brewer G. Combinatorial mRNA binding by AUF1 and Argonaute 2 controls decay of selected target mRNAs. Nucleic Acids Res 2013; 41:2644-58. [PMID: 23303783 PMCID: PMC3575833 DOI: 10.1093/nar/gks1453] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
The RNA-binding protein AUF1 binds AU-rich elements in 3′-untranslated regions to regulate mRNA degradation and/or translation. Many of these mRNAs are predicted microRNA targets as well. An emerging theme in post-transcriptional control of gene expression is that RNA-binding proteins and microRNAs co-regulate mRNAs. Recent experiments and bioinformatic analyses suggest this type of co-regulation may be widespread across the transcriptome. Here, we identified mRNA targets of AUF1 from a complex pool of cellular mRNAs and examined a subset of these mRNAs to explore the links between RNA binding and mRNA degradation for both AUF1 and Argonaute 2 (AGO2), which is an essential effector of microRNA-induced gene silencing. Depending on the specific mRNA examined, AUF1 and AGO2 binding is proportional/cooperative, reciprocal/competitive or independent. For most mRNAs in which AUF1 affects their decay rates, mRNA degradation requires AGO2. Thus, AUF1 and AGO2 present mRNA-specific allosteric binding relationships for co-regulation of mRNA degradation.
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Affiliation(s)
- Xiangyue Wu
- Department of Biochemistry and Molecular Biology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA
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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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Post-transcriptional control of gene expression by AUF1: mechanisms, physiological targets, and regulation. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2012; 1829:680-8. [PMID: 23246978 DOI: 10.1016/j.bbagrm.2012.12.002] [Citation(s) in RCA: 103] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 11/30/2012] [Accepted: 12/06/2012] [Indexed: 12/30/2022]
Abstract
AUF1 is a family of four proteins generated by alternative pre-mRNA splicing that form high affinity complexes with AU-rich, mRNA-destabilizing sequences located within the 3' untranslated regions of many labile mRNAs. While AUF1 binding is most frequently associated with accelerated mRNA decay, emerging examples have demonstrated roles as a mRNA stabilizer or even translational regulator for specific transcripts. In this review, we summarize recent advances in our understanding of mRNA recognition by AUF1 and the biochemical and functional consequences of these interactions. In addition, unique properties of individual AUF1 isoforms and the roles of these proteins in modulating expression of genes associated with inflammatory, neoplastic, and cardiac diseases are discussed. Finally, we describe mechanisms that regulate AUF1 expression in cells, and current knowledge of regulatory switches that modulate the cellular levels and/or activities of AUF1 isoforms through distinct protein post-translational modifications. This article is part of a Special Issue entitled: RNA Decay mechanisms.
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Wu X, Brewer G. The regulation of mRNA stability in mammalian cells: 2.0. Gene 2012; 500:10-21. [PMID: 22452843 DOI: 10.1016/j.gene.2012.03.021] [Citation(s) in RCA: 175] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 02/20/2012] [Accepted: 03/04/2012] [Indexed: 12/24/2022]
Abstract
Messenger RNA decay is an essential step in gene expression to set mRNA abundance in the cytoplasm. The binding of proteins and/or noncoding RNAs to specific recognition sequences or secondary structures within mRNAs dictates mRNA decay rates by recruiting specific enzyme complexes that perform the destruction processes. Often, the cell coordinates the degradation or stabilization of functional subsets of mRNAs encoding proteins collectively required for a biological process. As well, extrinsic or intrinsic stimuli activate signal transduction pathways that modify the mRNA decay machinery with consequent effects on decay rates and mRNA abundance. This review is an update to our 2001 Gene review on mRNA stability in mammalian cells, and we survey the enormous progress made over the past decade.
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Affiliation(s)
- Xiangyue Wu
- Department of Molecular Genetics, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ 08854, USA
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Cytosol protein regulation in H295R steroidogenesis model induced by the zearalenone metabolites, α- and β-zearalenol. Toxicon 2012; 59:17-24. [DOI: 10.1016/j.toxicon.2011.10.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 10/07/2011] [Accepted: 10/11/2011] [Indexed: 11/24/2022]
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Xin H, Brown JA, Gong C, Fan H, Brewer G, Gnarra JR. Association of the von Hippel-Lindau protein with AUF1 and posttranscriptional regulation of VEGFA mRNA. Mol Cancer Res 2011; 10:108-20. [PMID: 22086907 DOI: 10.1158/1541-7786.mcr-11-0435] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The von Hippel-Lindau (VHL) tumor suppressor gene product is the recognition component of an E3 ubiquitin ligase and is inactivated in patients with VHL disease and in most sporadic clear-cell renal cell carcinomas (RCC). pVHL controls oxygen-responsive gene expression at the transcriptional and posttranscriptional levels. The VEGFA mRNA contains AU-rich elements (ARE) in the 3'-untranslated region, and mRNA stability or decay is determined through ARE-associated RNA-binding factors. We show here that levels of the ARE-binding factor, AUF1, are regulated by pVHL and by hypoxia. pVHL and AUF1 stably associate with each other in cells and AUF1 is a ubiquitylation target of pVHL. AUF1 and another RNA-binding protein, HuR, bind to VEGFA ARE RNA. Ribonucleoprotein (RNP) immunoprecipitations showed that pVHL associates indirectly with VEGFA mRNA through AUF1 and/or HuR, and this complex is associated with VEGFA mRNA decay under normoxic conditions. Under hypoxic conditions pVHL is downregulated, whereas AUF1 and HuR binding to VEGF mRNA is maintained, and this complex is associated with stabilized mRNA. These studies suggest that AUF1 and HuR bind to VEGFA ARE RNA under both normoxic and hypoxic conditions, and that a pVHL-RNP complex determines VEGFA mRNA decay. These studies further implicate the ubiquitin-proteasome system in ARE-mediated RNA degradation.
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Affiliation(s)
- Hong Xin
- Department of Pediatrics, Louisiana State University Health Sciences Center, New Orleans, Louisiana, USA
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Zucconi BE, Wilson GM. Modulation of neoplastic gene regulatory pathways by the RNA-binding factor AUF1. FRONT BIOSCI-LANDMRK 2011; 16:2307-25. [PMID: 21622178 PMCID: PMC3589912 DOI: 10.2741/3855] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The mRNA-binding protein AUF1 regulates the expression of many key players in cancer including proto-oncogenes, regulators of apoptosis and the cell cycle, and pro-inflammatory cytokines, principally by directing the decay kinetics of their encoded mRNAs. Most studies support an mRNA-destabilizing role for AUF1, although other findings suggest additional functions for this factor. In this review, we explore how changes in AUF1 isoform distribution, subcellular localization, and post-translational protein modifications can influence the metabolism of targeted mRNAs. However, several lines of evidence also support a role for AUF1 in the initiation and/or development of cancer. Many AUF1-targeted transcripts encode products that control pro- and anti-oncogenic processes. Also, overexpression of AUF1 enhances tumorigenesis in murine models, and AUF1 levels are enhanced in some tumors. Finally, signaling cascades that modulate AUF1 function are deregulated in some cancerous tissues. Together, these features suggest that AUF1 may play a prominent role in regulating the expression of many genes that can contribute to tumorigenic phenotypes, and that this post-transcriptional regulatory control point may be subverted by diverse mechanisms in neoplasia.
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Affiliation(s)
- Beth E. Zucconi
- Department of Biochemistry and Molecular Biology and Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, 108 N. Greene St., Baltimore, MD 21201
| | - Gerald M. Wilson
- Department of Biochemistry and Molecular Biology and Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, 108 N. Greene St., Baltimore, MD 21201
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Pengal R, Guess AJ, Agrawal S, Manley J, Ransom RF, Mourey RJ, Benndorf R, Smoyer WE. Inhibition of the protein kinase MK-2 protects podocytes from nephrotic syndrome-related injury. Am J Physiol Renal Physiol 2011; 301:F509-19. [PMID: 21613416 DOI: 10.1152/ajprenal.00661.2010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
While mitogen-activated protein kinase (MAPK) activation has been implicated in the pathogenesis of various glomerular diseases, including nephrotic syndrome (NS), its specific role in podocyte injury is not known. We hypothesized that MK-2, a downstream substrate of p38 MAPK, mediates the adverse effects of this pathway and that inhibition of MK-2 would protect podocytes from NS-related injury. Using cultured podocytes, we analyzed 1) the roles of MK-2 and p38 MAPK in puromycin aminonucleoside (PAN)-induced podocyte injury; 2) the ability of specific MK-2 and p38 MAPK inhibitors to protect podocytes against injury; 3) the role of serum albumin, known to induce podocyte injury, in activating p38 MAPK/MK-2 signaling; and 4) the role of p38 MAPK/MK-2 signaling in the expression of Cox-2, an enzyme associated with podocyte injury. Treatment with protein kinase inhibitors specific for both MK-2 (C23, a pyrrolopyridine-type compound) or p38 MAPK (SB203580) reduced PAN-induced podocyte injury and actin cytoskeletal disruption. Both inhibitors reduced baseline podocyte p38 MAPK/MK-2 signaling, as measured by the degree of phosphorylation of HSPB1, a downstream substrate of MK-2, but exhibited disparate effects on upstream signaling. Serum albumin activated p38 MAPK/MK-2 signaling and induced Cox-2 expression, and these responses were blocked by both inhibitors. Given the critical importance of podocyte injury to both NS and other progressive glomerular diseases, these data suggest an important role for p38 MAPK/MK-2 signaling in podocyte injury and identify MK-2 inhibition as a promising potential therapeutic strategy to protect podocytes in various glomerular diseases.
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Affiliation(s)
- Ruma Pengal
- Center for Clinical and Translational Research, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA
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Lachke SA, Alkuraya FS, Kneeland SC, Ohn T, Aboukhalil A, Howell GR, Saadi I, Cavallesco R, Yue Y, Tsai ACH, Nair KS, Cosma MI, Smith RS, Hodges E, Alfadhli SM, Al-Hajeri A, Shamseldin HE, Behbehani A, Hannon GJ, Bulyk ML, Drack AV, Anderson PJ, John SWM, Maas RL. Mutations in the RNA granule component TDRD7 cause cataract and glaucoma. Science 2011; 331:1571-6. [PMID: 21436445 DOI: 10.1126/science.1195970] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The precise transcriptional regulation of gene expression is essential for vertebrate development, but the role of posttranscriptional regulatory mechanisms is less clear. Cytoplasmic RNA granules (RGs) function in the posttranscriptional control of gene expression, but the extent of RG involvement in organogenesis is unknown. We describe two human cases of pediatric cataract with loss-of-function mutations in TDRD7 and demonstrate that Tdrd7 nullizygosity in mouse causes cataracts, as well as glaucoma and an arrest in spermatogenesis. TDRD7 is a Tudor domain RNA binding protein that is expressed in lens fiber cells in distinct TDRD7-RGs that interact with STAU1-ribonucleoproteins (RNPs). TDRD7 coimmunoprecipitates with specific lens messenger RNAs (mRNAs) and is required for the posttranscriptional control of mRNAs that are critical to normal lens development and to RG function. These findings demonstrate a role for RGs in vertebrate organogenesis.
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Affiliation(s)
- Salil A Lachke
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA
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Krause CD, Izotova LS, Ren G, Yuan ZR, Shi Y, Chen CC, Ron Y, Pestka S. Efficient co-expression of bicistronic proteins in mesenchymal stem cells by development and optimization of a multifunctional plasmid. Stem Cell Res Ther 2011; 2:15. [PMID: 21401924 PMCID: PMC3226286 DOI: 10.1186/scrt56] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2010] [Accepted: 03/14/2011] [Indexed: 12/24/2022] Open
Abstract
INTRODUCTION Local synthesis of interferon within B16 tumors mediates anti-tumor effects. Based on reports that stem cells are recruited to tumors, and because systemic administration of interferon causes dose-limiting undesirable side effects, we wanted to improve the anti-tumor effects of interferon while simultaneously minimizing its systemic side effects by employing mesenchymal stem cells (MSCs) as tumor-localized ectopic producers of interferon. Many vectors exist to fulfill this purpose, but their transfection efficiency and resulting expression levels vary considerably. METHODS To follow both the recruitment to tumors and the synthesis of interferon by MSCs, we designed a bicistronic vector system that permits fluorescent visualization of vector-transfected and interferon-producing MSCs. We used Mu-IFNαA cDNA as the first cistron and the cherry fluorescent protein cDNA as the second cistron, whose translation requires the internal ribosome entry sequence (IRES) from the encephalomyocarditis virus 5' untranslated region. Observing inconsistent expression of these cistrons in various vectors and cell lines, especially compared with a control plasmid pmaxGFP, we optimized the expression of this bicistronic message by mutating pcDNA3 to facilitate exchange of the promoter and polyadenylation segments controlling both the gene of interest and the eukaryotic antibiotic resistance gene as well as the eukaryotic antibiotic resistance gene itself, and effectively compare the effects of these exchanges, creating plasmid pc3.5. RESULTS Murine MSCs stably and ectopically expressing Mu-IFNαA inhibited the establishment of tumors in homogeneic C57/BL6 mice. Mu-IFNαA expressed from the bicistronic message is fully biologically active, but is expressed at only two-thirds of the level observed from a monocistronic message. Cap-dependent translation is threefold more efficient than IRES-driven translation in 293T, B16, and MSC cell lines. Both efficient expression and good transfection efficiency require strong expression of the gene of interest and a chimeric intron. High doses of Mu-IFNαA within tumors inhibited tumor establishment but may not inhibit tumor growth. CONCLUSIONS Our modified vector and its derived plasmids will find use in stem cell therapeutics, gene expression, mRNA regulation, and transcription regulation. Local release of Mu-IFNαA within tumors may differently affect tumor establishment and tumor growth.
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Affiliation(s)
- Christopher D Krause
- Department of Molecular Genetics, Microbiology, and Immunology, RWJMS-UMDNJ, 675 Hoes Lane West, Piscataway, NJ 08854, USA
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