1
|
Eukaryotic Ribosomal Protein S5 of the 40S Subunit: Structure and Function. Int J Mol Sci 2023; 24:ijms24043386. [PMID: 36834797 PMCID: PMC9958902 DOI: 10.3390/ijms24043386] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Revised: 02/01/2023] [Accepted: 02/06/2023] [Indexed: 02/10/2023] Open
Abstract
The ribosomal protein RPS5 is one of the prime proteins to combine with RNA and belongs to the conserved ribosomal protein family. It plays a substantial role in the process of translation and also has some non-ribosome functions. Despite the enormous studies on the relationship between the structure and function of prokaryotic RPS7, the structure and molecular details of the mechanism of eukaryotic RPS5 remain largely unexplored. This article focuses on the structure of RPS5 and its role in cells and diseases, especially the binding to 18S rRNA. The role of RPS5 in translation initiation and its potential use as targets for liver disease and cancer are discussed.
Collapse
|
2
|
Morin C, Moyret-Lalle C, Mertani HC, Diaz JJ, Marcel V. Heterogeneity and dynamic of EMT through the plasticity of ribosome and mRNA translation. Biochim Biophys Acta Rev Cancer 2022; 1877:188718. [PMID: 35304296 DOI: 10.1016/j.bbcan.2022.188718] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 03/02/2022] [Accepted: 03/11/2022] [Indexed: 02/06/2023]
Abstract
Growing evidence exposes translation and its translational machinery as key players in establishing and maintaining physiological and pathological biological processes. Examining translation may not only provide new biological insight but also identify novel innovative therapeutic targets in several fields of biology, including that of epithelial-to-mesenchymal transition (EMT). EMT is currently considered as a dynamic and reversible transdifferentiation process sustaining the transition from an epithelial to mesenchymal phenotype, known to be mainly driven by transcriptional reprogramming. However, it seems that the characterization of EMT plasticity is challenging, relying exclusively on transcriptomic and epigenetic approaches. Indeed, heterogeneity in EMT programs was reported to depend on the biological context. Here, by reviewing the involvement of translational control, translational machinery and ribosome biogenesis characterizing the different types of EMT, from embryonic and adult physiological to pathological contexts, we discuss the added value of integrating translational control and its machinery to depict the heterogeneity and dynamics of EMT programs.
Collapse
Affiliation(s)
- Chloé Morin
- Inserm U1052, CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, F-69373 Lyon Cedex 08, France; Institut Convergence PLAsCAN, 69373 Lyon cedex 08, France; DevWeCan Labex Laboratory, 69373 Lyon cedex 08, France
| | - Caroline Moyret-Lalle
- Inserm U1052, CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, F-69373 Lyon Cedex 08, France; Institut Convergence PLAsCAN, 69373 Lyon cedex 08, France; DevWeCan Labex Laboratory, 69373 Lyon cedex 08, France
| | - Hichem C Mertani
- Inserm U1052, CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, F-69373 Lyon Cedex 08, France; Institut Convergence PLAsCAN, 69373 Lyon cedex 08, France; DevWeCan Labex Laboratory, 69373 Lyon cedex 08, France
| | - Jean-Jacques Diaz
- Inserm U1052, CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, F-69373 Lyon Cedex 08, France; Institut Convergence PLAsCAN, 69373 Lyon cedex 08, France; DevWeCan Labex Laboratory, 69373 Lyon cedex 08, France
| | - Virginie Marcel
- Inserm U1052, CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Centre Léon Bérard, F-69373 Lyon Cedex 08, France; Institut Convergence PLAsCAN, 69373 Lyon cedex 08, France; DevWeCan Labex Laboratory, 69373 Lyon cedex 08, France.
| |
Collapse
|
3
|
Qin L, Wang X, Gao Y, Bi K, Wang W. Roles of EvpP in Edwardsiella piscicida-Macrophage Interactions. Front Cell Infect Microbiol 2020; 10:53. [PMID: 32117819 PMCID: PMC7033576 DOI: 10.3389/fcimb.2020.00053] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 01/28/2020] [Indexed: 12/15/2022] Open
Abstract
Edwardsiella piscicida is found to be an important facultative intracellular pathogen with a broad host range. These organisms can replicate and survive within host macrophages to escape from the subversion of the immune defense. E. piscicida-macrophage interaction is very important in determining the outcome of edwardsiellasis. As an effector protein of E. piscicida T6SS, EvpP has been determined to be a very important virulence factor for E. piscicida, although its precise role in E. piscicida-macrophage interactions is not yet clear. In this study, the roles of EvpP in E. piscicida-macrophage interactions were characterized. Here, we constructed the deletion mutants of evpP (ΔevpP) and complementation (ΔevpP-C) by the allelic exchange method. Compared to wild type strain (WT), ΔevpP was found to be attenuated for growth within macrophages. In line with this observation, we found its survival capacity was lower than WT under oxidative and acid stress in vitro, which simulate conditions encountered in host macrophages. Attenuation of ΔevpP also correlated with enhanced activation of macrophages, as reflected by augmented NO production in ΔevpP-treated macrophages. Moreover, compared to WT, ΔevpP induced markedly increased apoptosis of macrophages, characterized by increased Annexin V binding and the activation of cleaved caspase-3. These findings provided strong evidence that EvpP is involved in the process of E. piscicida-macrophage interactions and is required for its survival and replication in macrophages. Thus, we propose that EvpP might be an important factor that controlling the fate of E. piscicida inside macrophages. To further exploring the underlying mechanism of EvpP action, the cDNA library was constructed from E. piscicida-infected macrophages and a yeast two-hybrid screen was performed to search for cellular proteins interacting with EvpP. Ribosomal protein S5 (RPS5) was identified as a target of EvpP. Furthermore, the interaction was validated with co-immunoprecipitation assay. This result implies that the observed effect of EvpP on macrophages might be related to RPS5-mediated regulation, contributing to a better understanding of the mechanisms of EvpP involved in E. piscicida-macrophage interactions.
Collapse
Affiliation(s)
- Lei Qin
- Jiangsu Key Laboratory of Marine Biotechnology, College of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang, China.,Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Lianyungang, China
| | - Xingqiang Wang
- Jiangsu Key Laboratory of Marine Biotechnology, College of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang, China
| | - Yingli Gao
- Jiangsu Key Laboratory of Marine Biotechnology, College of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang, China
| | - Keran Bi
- Jiangsu Key Laboratory of Marine Biotechnology, College of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang, China
| | - Weixia Wang
- Jiangsu Key Laboratory of Marine Biotechnology, College of Marine Life and Fisheries, Jiangsu Ocean University, Lianyungang, China
| |
Collapse
|
4
|
Vasilyeva AE, Yanshina DD, Karpova GG, Malygin AA. Mutations Preventing the Phosphorylation of Human Ribosomal Protein uS15 at Y38 and S48 Reduce the Efficiency of its Transfer into the Nucleolus. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1068162019060372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
5
|
Tomioka M, Shimobayashi M, Kitabatake M, Ohno M, Kozutsumi Y, Oka S, Takematsu H. Ribosomal protein uS7/Rps5 serine-223 in protein kinase-mediated phosphorylation and ribosomal small subunit maturation. Sci Rep 2018; 8:1244. [PMID: 29352143 PMCID: PMC5775349 DOI: 10.1038/s41598-018-19652-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 01/05/2018] [Indexed: 01/11/2023] Open
Abstract
Cellular translation should be precisely controlled in response to extracellular cues. However, knowledge is limited concerning signal transduction-regulated translation. In the present study, phosphorylation was identified in the 40S small subunit ribosomal protein uS7 (Yjr123w/previously called as Rps5) by Ypk1 and Pkc1, AGC family protein kinases in yeast Saccharomyces cerevisiae. Serine residue 223 (Ser223) of uS7 in the conserved C-terminal region was crucial for this phosphorylation event. S223A mutant uS7 caused severe reduction of small ribosomal subunit production, likely due to compromised interaction with Rio2, resulting in both reduced translation and reduced cellular proliferation. Contrary to optimal culture conditions, heat stressed S223A mutant cells exhibited increased heat resistance and induced heat shock proteins. Taken together, an intracellular signal transduction pathway involving Ypk1/Pkc1 seemed to play an important role in ribosome biogenesis and subsequent cellular translation, utilizing uS7 as a substrate.
Collapse
Affiliation(s)
- Makoto Tomioka
- Laboratory of Biological Chemistry, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan.,Laboratory of Membrane Biochemistry and Biophysics, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Mitsugu Shimobayashi
- Laboratory of Membrane Biochemistry and Biophysics, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.,Biozentrum - Center for Molecular Life Sciences, University of Basel, Basel, Switzerland
| | - Makoto Kitabatake
- Laboratory of RNA System, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Mutsuhito Ohno
- Laboratory of RNA System, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
| | - Yasunori Kozutsumi
- Laboratory of Membrane Biochemistry and Biophysics, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Shogo Oka
- Laboratory of Biological Chemistry, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hiromu Takematsu
- Laboratory of Biological Chemistry, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan. .,Laboratory of Membrane Biochemistry and Biophysics, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
| |
Collapse
|
6
|
Chen X, Zhi X, Cao L, Weng W, Pan P, Hu H, Liu C, Zhao Q, Zhou Q, Cui J, Su J. Matrine derivate MASM uncovers a novel function for ribosomal protein S5 in osteoclastogenesis and postmenopausal osteoporosis. Cell Death Dis 2017; 8:e3037. [PMID: 28880271 PMCID: PMC5636967 DOI: 10.1038/cddis.2017.394] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Revised: 07/09/2017] [Accepted: 07/11/2017] [Indexed: 02/08/2023]
Abstract
Postmenopausal osteoporosis (POMP) is a public health problem characterized by decreased bone density and increased fracture risk. Over-activated osteoclastogenesis plays a vital role in POMP. Here we developed a novel bioactive compound MASM (M19) based on sophocarpine. Although it showed no significant effects on osteogenesis and adipogenesis for bone marrow-derived mesenchymal stem cells (BMSCs) in vitro, it could significantly inhibit RANKL/M-CSF induced osteoclastogenesis through suppressing NF-κB, MAPKs and PI3K/Akt pathways in vitro and ameliorate bone loss in ovariectomized mice in vivo. Ribosomal protein s5 (RPS5) has been identified as a target of M19 and regulates PI3K/Akt, NF-κB and MAPKs pathways in osteoclastogenesis. Overexpressions of RPS5 synergistically inhibited osteoclastogenesis with M19 while silencing RPS5 compromised M19 inhibitory effects on osteoclastogenesis in vitro. Among the three pathways, Akt plays a major role in M19 effects. The Akt activator SC79 partially reversed the inhibitory effects on osteoclastogenesis by M19 and RPS5-knocking-down. It indicates that RPS5 serves as a potential candidate target for inhibiting osteoclastogenesis and osteoporosis therapy and M19 is a promising agent for POMP treatment.
Collapse
Affiliation(s)
- Xiao Chen
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Xin Zhi
- Graduate Management Unit, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China
| | - Liehu Cao
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Weizong Weng
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Panpan Pan
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Honggang Hu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Chao Liu
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Qingjie Zhao
- School of Pharmacy, Second Military Medical University, Shanghai 200433, China
| | - Qirong Zhou
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Jin Cui
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| | - Jiacan Su
- Department of Orthopedics Trauma, Shanghai Changhai Hospital, Second Military Medical University, Yangpu District, Shanghai 200433, China.,China-South Korea Bioengineering Center, Jiading District, Shanghai 201802, China
| |
Collapse
|
7
|
AtMBD6, a methyl CpG binding domain protein, maintains gene silencing in Arabidopsis by interacting with RNA binding proteins. J Biosci 2017; 42:57-68. [PMID: 28229965 DOI: 10.1007/s12038-016-9658-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
DNA methylation, mediated by double-stranded RNA, is a conserved epigenetic phenomenon that protects a genome from transposons, silences unwanted genes and has a paramount function in plant or animal development. Methyl CpG binding domain proteins are members of a class of proteins that bind to methylated DNA. The Arabidopsis thaliana genome encodes 13 methyl CpG binding domain (MBD) proteins, but the molecular/biological functions of most of these proteins are still not clear. In the present study, we identified four proteins that interact with AtMBD6. Interestingly, three of them contain RNA binding domains and are co-localized with AtMBD6 in the nucleus. The interacting partners includes AtRPS2C (a 40S ribosomal protein), AtNTF2 (nuclear transport factor 2) and AtAGO4 (Argonoute 4). The fourth protein that physically interacts with AtMBD6 is a histone-modifying enzyme, histone deacetylase 6 (AtHDA6), which is a known component of the RNA-mediated gene silencing system. Analysis of genomic DNA methylation in the atmbd6, atrps2c and atntf2 mutants, using methylation-sensitive PCR detected decreased DNA methylation at miRNA/siRNA producing loci, pseudogenes and other targets of RNA-directed DNA methylation. Our results indicate that AtMBD6 is involved in RNA-mediated gene silencing and it binds to RNA binding proteins like AtRPS2C, AtAGO4 and AtNTF2. AtMBD6 also interacts with histone deacetylase AtHDA6 that might have a role in chromatin condensation at the targets of RdDM.
Collapse
|
8
|
Xu J, Wang KQ, Xu WH, Li YH, Qi Y, Wu HY, Li JZ, He ZG, Hu HG, Wang Y, Zhang JP. The Matrine Derivate MASM Prolongs Survival, Attenuates Inflammation, and Reduces Organ Injury in Murine Established Lethal Sepsis. J Infect Dis 2016; 214:1762-1772. [PMID: 27658692 DOI: 10.1093/infdis/jiw445] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/13/2016] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND MASM, a novel derivative of matrine, has inhibitory effects on activation of macrophages, dendritic cells, and hepatic stellate cells and binds to ribosomal protein S5 (RPS5). This study was designed to evaluate the effect of MASM on murine-established lethal sepsis and its mechanisms. METHODS Mouse peritoneal macrophages and RAW264.7 cells that were infected with recombinant lentiviruses encoding shRPS5 were incubated with lipopolysaccharide (LPS) in the absence or presence of MASM in vitro. Endotoxemia induced by LPS injection and sepsis induced by cecal ligation and puncture was followed by MASM treatment. RESULTS MASM markedly attenuated LPS-induced release and messenger RNA expression of tumor necrosis factor α, interleukin 6, and NO/inducible NO synthase in murine peritoneal macrophages and RAW264.7 cells. Meanwhile, MASM inhibited LPS-induced activation of nuclear factor κB and MAPK pathways. Consistently, RPS5 suppressed LPS-induced inflammatory responses and at least in part mediated the antiinflammatory effect of MASM in vitro. Remarkably, delayed administration of MASM could significantly reduce mortality in mouse sepsis models, which was associated with the reduction in the inflammatory response, the attenuation in multiple organ injury, and the enhanced bacterial clearance. CONCLUSIONS MASM could be further explored for the treatments of sepsis, especially for administration later after the onset of sepsis.
Collapse
Affiliation(s)
- Jing Xu
- School of Pharmacy, Second Military Medical University.,Department of Pharmacy, Shanghai East Hospital, Tongji University, China
| | - Ke-Qi Wang
- School of Pharmacy, Second Military Medical University
| | - Wei-Heng Xu
- School of Pharmacy, Second Military Medical University
| | - Ying-Hua Li
- School of Pharmacy, Second Military Medical University
| | - Yang Qi
- School of Pharmacy, Second Military Medical University
| | - Hong-Yuan Wu
- School of Pharmacy, Second Military Medical University
| | - Jian-Zhong Li
- School of Pharmacy, Second Military Medical University
| | - Zhi-Gao He
- Department of Pharmacy, Shanghai East Hospital, Tongji University, China
| | - Hong-Gang Hu
- School of Pharmacy, Second Military Medical University
| | - Yan Wang
- School of Pharmacy, Second Military Medical University
| | | |
Collapse
|
9
|
Zhang D, Chen HP, Duan HF, Gao LH, Shao Y, Chen KY, Wang YL, Lan FH, Hu XW. Aggregation of Ribosomal Protein S6 at Nucleolus Is Cell Cycle-Controlled and Its Function in Pre-rRNA Processing Is Phosphorylation Dependent. J Cell Biochem 2015; 117:1649-57. [PMID: 26639987 DOI: 10.1002/jcb.25458] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 12/04/2015] [Indexed: 02/02/2023]
Abstract
Ribosomal protein S6 (rpS6) has long been regarded as one of the primary r-proteins that functions in the early stage of 40S subunit assembly, but its actual role is still obscure. The correct forming of 18S rRNA is a key step in the nuclear synthesis of 40S subunit. In this study, we demonstrate that rpS6 participates in the processing of 30S pre-rRNA to 18S rRNA only when its C-terminal five serines are phosphorylated, however, the process of entering the nucleus and then targeting the nucleolus does not dependent its phosphorylation. Remarkably, we also find that the aggregation of rpS6 at the nucleolus correlates to the phasing of cell cycle, beginning to concentrate in the nucleolus at later S phase and disaggregate at M phase. J. Cell. Biochem. 117: 1649-1657, 2016. © 2015 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Duo Zhang
- Department of Clinical Genetics and Experimental Medicine, Fuzhou General Hospital, Xiamen University School of Medicine, Fuzhou, Fujian, 350025, P. R. China.,Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - Hui-Peng Chen
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - Hai-Feng Duan
- Beijing Institute of Radiation Medicine, Beijing, 100850, P. R. China
| | - Li-Hua Gao
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - Yong Shao
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - Ke-Yan Chen
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - You-Liang Wang
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| | - Feng-Hua Lan
- Department of Clinical Genetics and Experimental Medicine, Fuzhou General Hospital, Xiamen University School of Medicine, Fuzhou, Fujian, 350025, P. R. China
| | - Xian-Wen Hu
- Beijing Institute of Biotechnology, Beijing, 100071, P. R. China
| |
Collapse
|
10
|
Xu WH, Hu HG, Tian Y, Wang SZ, Li J, Li JZ, Deng X, Qian H, Qiu L, Hu ZL, Wu QY, Chai YF, Guo C, Xie WF, Zhang JP. Bioactive compound reveals a novel function for ribosomal protein S5 in hepatic stellate cell activation and hepatic fibrosis. Hepatology 2014; 60:648-60. [PMID: 24668691 DOI: 10.1002/hep.27138] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 03/10/2014] [Accepted: 03/20/2014] [Indexed: 01/18/2023]
Abstract
UNLABELLED Liver fibrosis and its endstage, cirrhosis, represent a major public health problem worldwide. Activation of hepatic stellate cells (HSCs) is a central event in hepatic fibrosis. However, the proteins that control HSC activation are incompletely understood. Here we show that (6aS, 10S, 11aR, 11bR, 11cS)-10-methylamino-dodecahydro-3a, 7a-diaza-benzo [de]anthracene-8-thione (MASM) exhibits potent inhibitory activity against liver fibrosis in vitro and in vivo associated with the reduction of Akt phosphorylation. Furthermore, ribosomal protein S5 (RPS5) was identified as a direct target of MASM, which stabilized RPS5 in cultured HSCs and in the liver of experimental animals after dimethylnitrosamine (DMN) or bile duct ligation (BDL). Functional studies revealed that RPS5 could prevent HSC activation. RPS5 overexpression in HSCs resulted in Akt dephosphorylation at both Ser473 and Thr308, and led to subsequent dephosphorylation of GSK3β or P70S6K. Progression of DMN- and BDL-induced hepatic fibrosis was aggravated by Rps5 knockdown and alleviated by RPS5 overexpression, which correlated with the modulation of Akt phosphorylation and HSC number in the fibrotic livers. Moreover, RPS5 was substantially reduced in the transdifferentiated HSCs, experimental fibrotic livers, and human cirrhosis samples. CONCLUSION These results demonstrate that RPS5 is implicated in hepatic fibrogenesis and may represent a promising target for potential therapeutic intervention in liver fibrotic diseases.
Collapse
Affiliation(s)
- Wei-Heng Xu
- College of Pharmacy, Second Military Medical University, Shanghai, China
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Sogame Y, Kojima K, Takeshita T, Fujiwara S, Miyata S, Kinoshita E, Matsuoka T. Protein phosphorylation in encystment-induced Colpoda cucullus: localization and identification of phosphoproteins. FEMS Microbiol Lett 2012; 331:128-35. [DOI: 10.1111/j.1574-6968.2012.02560.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2012] [Revised: 03/23/2012] [Accepted: 03/23/2012] [Indexed: 11/28/2022] Open
Affiliation(s)
- Yoichiro Sogame
- Institute of Biological Science; Faculty of Science; Kochi University; Kochi; Japan
| | - Katsuhiko Kojima
- Department of Microbiology and Immunology; Shinshu University School of Medicine; Nagano; Japan
| | - Toshikazu Takeshita
- Department of Microbiology and Immunology; Shinshu University School of Medicine; Nagano; Japan
| | - Shigeki Fujiwara
- Department of Applied Science; Faculty of Science; Kochi University; Kochi; Japan
| | - Seiji Miyata
- Department of Applied Biology; Kyoto Institute of Technology; Kyoto; Japan
| | - Eiji Kinoshita
- Department of Functional Molecular Science; Graduate School of Biomedical Sciences; Hiroshima University; Hiroshima; Japan
| | - Tatsuomi Matsuoka
- Institute of Biological Science; Faculty of Science; Kochi University; Kochi; Japan
| |
Collapse
|
12
|
Cisterna B, Biggiogera M. Ribosome biogenesis: from structure to dynamics. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2010; 284:67-111. [PMID: 20875629 DOI: 10.1016/s1937-6448(10)84002-x] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In this chapter we describe the status of the research concerning the nucleolus, the major nuclear body. The nucleolus has been recognized as a dynamic organelle with many more functions than one could imagine. In fact, in addition to its fundamental role in the biogenesis of preribosomes, the nucleolus takes part in many other cellular processes and functions, such as the cell-cycle control and the p53 pathway: the direct or indirect involvement of the nucleolus in these various processes makes it sensitive to their alteration. Moreover, it is worth noting that the different nucleolar factors participating to independent mechanisms show different dynamics of association/disassociation with the nucleolar body.
Collapse
Affiliation(s)
- Barbara Cisterna
- Laboratory of Cell Biology and Neurobiology, Department of Animal Biology, University of Pavia, Pavia, Italy
| | | |
Collapse
|