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The mechanisms of action of chromatin remodelers and implications in development and disease. Biochem Pharmacol 2020; 180:114200. [DOI: 10.1016/j.bcp.2020.114200] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/09/2020] [Accepted: 08/12/2020] [Indexed: 02/06/2023]
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52
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Fingerhut JM, Yamashita YM. mRNA localization mediates maturation of cytoplasmic cilia in Drosophila spermatogenesis. J Cell Biol 2020; 219:e202003084. [PMID: 32706373 PMCID: PMC7480094 DOI: 10.1083/jcb.202003084] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 06/10/2020] [Accepted: 06/15/2020] [Indexed: 01/26/2023] Open
Abstract
Cytoplasmic cilia, a specialized type of cilia in which the axoneme resides within the cytoplasm rather than within the ciliary compartment, are proposed to allow for the efficient assembly of very long cilia. Despite being found diversely in male gametes (e.g., Plasmodium falciparum microgametocytes and human and Drosophila melanogaster sperm), very little is known about cytoplasmic cilia assembly. Here, we show that a novel RNP granule containing the mRNAs for axonemal dynein motor proteins becomes highly polarized to the distal end of the cilia during cytoplasmic ciliogenesis in Drosophila sperm. This allows for the incorporation of these axonemal dyneins into the axoneme directly from the cytoplasm, possibly by localizing translation. We found that this RNP granule contains the proteins Reptin and Pontin, loss of which perturbs granule formation and prevents incorporation of the axonemal dyneins, leading to sterility. We propose that cytoplasmic cilia assembly requires the precise localization of mRNAs encoding key axonemal constituents, allowing these proteins to incorporate efficiently into the axoneme.
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Affiliation(s)
- Jaclyn M. Fingerhut
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI
- Life Sciences Institute, University of Michigan, Ann Arbor, MI
| | - Yukiko M. Yamashita
- Cellular and Molecular Biology Program, University of Michigan, Ann Arbor, MI
- Life Sciences Institute, University of Michigan, Ann Arbor, MI
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI
- Howard Hughes Medical Institute, University of Michigan, Ann Arbor, MI
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Zhu D, Xu L, Wei X, Xia B, Gong Y, Li Q, Chen X. PPARγ enhanced Adiponectin polymerization and trafficking by promoting RUVBL2 expression during adipogenic differentiation. Gene 2020; 764:145100. [PMID: 32877748 DOI: 10.1016/j.gene.2020.145100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 08/16/2020] [Accepted: 08/25/2020] [Indexed: 01/08/2023]
Abstract
Adipocyte differentiation is an essential part of adipose tissue development, and is closely related to obesity and obesity-related diseases. In this study, we found that the expression of PPARγ, RUVBL2 and Adiponectin were concurrently obviously increased in the 5th-7th day of 3T3-L1 cell differentiation. PPARγ overexpression or the PPARγ activator facilitated Adiponectin trafficking and secretion and upregulated RUVBL2 expression as well as AS160 phosphorylation during adipogenic differentiation of 3T3-L1 cells. Consistently RUVBL2 overexpression also enhanced the polymerization and secretion of Adiponectin, in contrast, RUVBL2 knockdown reduced Adiponectin secretion. Further, PPARγ significantly enhanced RUVBL2 promoter activity and transcription. The progressive deletions and mutations of RUVBL2 promoter for PPARγ binding sites suggested that the PPARγ binding motif situated at -804/-781 bp is an essential component required for RUVBL2 promoter activity. Chromatin immunoprecipitation (ChIP) assays determined that PPARγ can directly interact with the RUVBL2 promoter DNA. Taken together, these data suggest that PPARγ promotes the expression, polymerization and secretion of Adiponectin by activating RUVBL2 transcriptionally, which accelerates 3T3-L1 cell differentiation.
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Affiliation(s)
- Daiyun Zhu
- College of Animal Science and Technology & College of Veterinary Medicine, Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Le Xu
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xuan Wei
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Benzeng Xia
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Yuqing Gong
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Qinjin Li
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xiaodong Chen
- College of Animal Science and Technology & College of Veterinary Medicine, Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agricultural University, Wuhan 430070, PR China.
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Deregulated levels of RUVBL1 induce transcription-dependent replication stress. Int J Biochem Cell Biol 2020; 128:105839. [PMID: 32846207 DOI: 10.1016/j.biocel.2020.105839] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 08/11/2020] [Accepted: 08/20/2020] [Indexed: 12/16/2022]
Abstract
Chromatin regulators control transcription and replication, however if and how they might influence the coordination of these processes still is largely unknown. RUVBL1 and the related ATPase RUVBL2 participate in multiple nuclear processes and are implicated in cancer. Here, we report that both the excess and the deficit of the chromatin regulator RUVBL1 impede DNA replication as a consequence of altered transcription. Surprisingly, cells that either overexpressed or were silenced for RUVBL1 had slower replication fork rates and accumulated phosphorylated H2AX, dependent on active transcription. However, the mechanisms of transcription-dependent replication stress were different when RUVBL1 was overexpressed and when depleted. RUVBL1 overexpression led to increased c-Myc-dependent pause release of RNAPII, as evidenced by higher overall transcription, much stronger Ser2 phosphorylation of Rpb1- C-terminal domain, and enhanced colocalization of Rpb1 and c-Myc. RUVBL1 deficiency resulted in increased ubiquitination of Rpb1 and reduced mobility of an RNAP subunit, suggesting accumulation of stalled RNAPIIs on chromatin. Overall, our data show that by modulating the state of RNAPII complexes, RUVBL1 deregulation induces replication-transcription interference and compromises genome integrity during S-phase.
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55
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Lin D, Lin B, Bhanot H, Riou R, Abt NB, Rajagopal J, Saladi SV. RUVBL1 is an amplified epigenetic factor promoting proliferation and inhibiting differentiation program in head and neck squamous cancers. Oral Oncol 2020; 111:104930. [PMID: 32745900 DOI: 10.1016/j.oraloncology.2020.104930] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/24/2020] [Accepted: 07/22/2020] [Indexed: 12/14/2022]
Abstract
Mutations in histone modifying enzymes and histone variants were identified in multiple cancers in The Cancer Genome Atlas (TCGA) studies. However, very little progress and understanding has been made in identifying the contribution of epigenetic factors in head and neck squamous cell carcinoma (HNSCC). Here, we report the identification of RUVBL1 (TIP49a), a component of the TIP60 histone modifying complex as being amplified and overexpressed in HNSCC. RUVBL1 plays a key role in incorporating histone variant H2AZ in chromatin thereby regulating transcription of key genes involved in differentiation, cancer cell proliferation and invasion. H2AZ is also overexpressed in HNSCC tumors thereby regulating RUVBL1/H2AZ dependent transcriptional programs. Patient data analysis of multiple cohorts including TCGA and single cell HNSCC data indicated RUVBL1 overexpression as a poor prognostic marker and predicts poor survival. In vitro experiments indicate a pro-proliferative role for RUVBL1/H2AZ in HNSCC cells. RUVBL1 inversely correlates with differentiation program and positively correlates with oncogenic programs, making it a key contributor to tumorigenesis and a vulnerable therapeutic target in HNSCC patients.
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Affiliation(s)
- Derrick Lin
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, United States; Massachusetts General Hospital Cancer Center, United States
| | - Brian Lin
- Center for Regenerative Medicine, Massachusetts General Hospital, Harvard Medical School, United States
| | - Haymanti Bhanot
- Dana Farber Cancer Institute, Harvard Medical School, United States
| | - Rozenn Riou
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, United States
| | - Nicholas B Abt
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, United States; Massachusetts General Hospital Cancer Center, United States
| | - Jayaraj Rajagopal
- Center for Regenerative Medicine, Massachusetts General Hospital, Harvard Medical School, United States; Broad Institute of MIT and Harvard, United States
| | - Srinivas Vinod Saladi
- Massachusetts Eye and Ear Infirmary, Harvard Medical School, United States; Massachusetts General Hospital Cancer Center, United States; Broad Institute of MIT and Harvard, United States.
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56
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Marin JJ, Macias RI, Monte MJ, Romero MR, Asensio M, Sanchez-Martin A, Cives-Losada C, Temprano AG, Espinosa-Escudero R, Reviejo M, Bohorquez LH, Briz O. Molecular Bases of Drug Resistance in Hepatocellular Carcinoma. Cancers (Basel) 2020; 12:cancers12061663. [PMID: 32585893 PMCID: PMC7352164 DOI: 10.3390/cancers12061663] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/19/2020] [Accepted: 06/20/2020] [Indexed: 12/11/2022] Open
Abstract
The poor outcome of patients with non-surgically removable advanced hepatocellular carcinoma (HCC), the most frequent type of primary liver cancer, is mainly due to the high refractoriness of this aggressive tumor to classical chemotherapy. Novel pharmacological approaches based on the use of inhibitors of tyrosine kinases (TKIs), mainly sorafenib and regorafenib, have provided only a modest prolongation of the overall survival in these HCC patients. The present review is an update of the available information regarding our understanding of the molecular bases of mechanisms of chemoresistance (MOC) with a significant impact on the response of HCC to existing pharmacological tools, which include classical chemotherapeutic agents, TKIs and novel immune-sensitizing strategies. Many of the more than one hundred genes involved in seven MOC have been identified as potential biomarkers to predict the failure of treatment, as well as druggable targets to develop novel strategies aimed at increasing the sensitivity of HCC to pharmacological treatments.
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Affiliation(s)
- Jose J.G. Marin
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
- Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, 28029 Madrid, Spain
- Correspondence: (J.J.G.M.); (O.B.); Tel.: +34-663182872 (J.J.G.M.); +34-923294674 (O.B.)
| | - Rocio I.R. Macias
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
- Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, 28029 Madrid, Spain
| | - Maria J. Monte
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
- Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, 28029 Madrid, Spain
| | - Marta R. Romero
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
- Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, 28029 Madrid, Spain
| | - Maitane Asensio
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Anabel Sanchez-Martin
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Candela Cives-Losada
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Alvaro G. Temprano
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Ricardo Espinosa-Escudero
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Maria Reviejo
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Laura H. Bohorquez
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
| | - Oscar Briz
- Experimental Hepatology and Drug Targeting (HEVEFARM) Group, University of Salamanca, IBSAL, 37007 Salamanca, Spain; (R.I.R.M.); (M.J.M.); (M.R.R.); (M.A.); (A.S.-M.); (C.C.-L.); (A.G.T.); (R.E.-E.); (M.R.); (L.H.B.)
- Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, 28029 Madrid, Spain
- Correspondence: (J.J.G.M.); (O.B.); Tel.: +34-663182872 (J.J.G.M.); +34-923294674 (O.B.)
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Uchida D, Takaki A, Oyama A, Adachi T, Wada N, Onishi H, Okada H. Oxidative Stress Management in Chronic Liver Diseases and Hepatocellular Carcinoma. Nutrients 2020; 12:nu12061576. [PMID: 32481552 PMCID: PMC7352310 DOI: 10.3390/nu12061576] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 12/12/2022] Open
Abstract
Chronic viral hepatitis B and C and non-alcoholic fatty liver disease (NAFLD) have been widely acknowledged to be the leading causes of liver cirrhosis and hepatocellular carcinoma. As anti-viral treatment progresses, the impact of NAFLD is increasing. NAFLD can coexist with chronic viral hepatitis and exacerbate its progression. Oxidative stress has been recognized as a chronic liver disease progression-related and cancer-initiating stress response. However, there are still many unresolved issues concerning oxidative stress, such as the correlation between the natural history of the disease and promising treatment protocols. Recent findings indicate that oxidative stress is also an anti-cancer response that is necessary to kill cancer cells. Oxidative stress might therefore be a cancer-initiating response that should be down regulated in the pre-cancerous stage in patients with risk factors for cancer, while it is an anti-cancer cell response that should not be down regulated in the post-cancerous stage, especially in patients using anti-cancer agents. Antioxidant nutrients should be administered carefully according to the patients’ disease status. In this review, we will highlight these paradoxical effects of oxidative stress in chronic liver diseases, pre- and post-carcinogenesis.
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Li H, Tong X, Xu Y, Wang M, Dai H, Shi T, Sun M, Chen K, Cheng X, Wei Q. Functional genetic variants of RUVBL1 predict overall survival of Chinese patients with epithelial ovarian cancer. Carcinogenesis 2020; 40:1209-1219. [PMID: 31083717 DOI: 10.1093/carcin/bgz092] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 04/10/2019] [Accepted: 05/12/2019] [Indexed: 11/13/2022] Open
Abstract
To date, the 5-year overall survival of epithelial ovarian cancer (EOC) remains poor. Because studies suggest that RUVBL1 may be a chemotherapeutic target for the treatment of cancer, in this study, therefore, we investigated the role of potentially functional single nucleotide polymorphisms (SNPs) of RUVBL1 in the survival of Chinese patients with EOC, and we subsequently performed functional prediction and validation of the identified significant SNPs. We found that RUVBL1 rs1057156 A>G and RUVBL1 rs149652370 A>G were associated with survival of EOC patients in the multivariate Cox proportional hazards regression analysis. Specifically, the RUVBL1 rs149652370 AG genotype was associated with a shorter progression-free survival ([adjusted hazards ratio (HR)] = 3.32, 95% confidence interval (CI) = 1.76-6.25 and P = 2.01E-04), compared with the AA genotype. The RUVBL1 rs1057156 AG (only nine had GG) genotype was also associated with a poor overall survival (adjusted HR = 1.73, 95% CI = 1.19-2.52, P = 0.004), compared with the AA genotype. Further experiments showed that the RUVBL1 rs1057156 A>G change lowered its binding affinity to microRNA-4294 and led to upregulation of the RUVBL1 expression. We further found that overexpression of RUVBL1 promoted cell proliferation and metastatic potential. Overall, RUVBL1 enhanced EOC cell proliferation, invasion and migration presumably by stimulating the process of glycolysis. Thus, this study provides evidence that functional variants of RUVBL1 may regulate its gene expression, a possible mechanism affecting survival of EOC patients and that RUVBL1 may be a potential chemotherapeutic target for the treatment of EOC patients.
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Affiliation(s)
- Haoran Li
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Xiaoxia Tong
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Yuan Xu
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Mengyun Wang
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China
| | - Hongji Dai
- Department of Epidemiology and Biostatistics, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Ministry of Education, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Tingyan Shi
- Ovarian Cancer Program, Division of Gynecologic Oncology, Department of Gynecology and Obstetrics, Fudan University Zhongshan Hospital, Shanghai, China
| | - Menghong Sun
- Department of Pathology, Tissue Bank, Shanghai, China
| | - Kexin Chen
- Department of Epidemiology and Biostatistics, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China.,Key Laboratory of Breast Cancer Prevention and Therapy, Ministry of Education, National Clinical Research Center for Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - Xi Cheng
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, China.,Department of Gynecologic Oncology, Fudan University Shanghai Cancer Center, Shanghai, China
| | - Qingyi Wei
- Cancer Institute, Fudan University Shanghai Cancer Center, Shanghai, China.,Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA.,Department of Population Health Sciences, Duke University School of Medicine, Durham, NC, USA
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Park KC, Park JH, Baek SH, Kim KI. Pontin-deficiency causes senescence in fibroblast cells and epidermal keratinocytes but induces apoptosis in cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2020; 1867:118740. [PMID: 32417257 DOI: 10.1016/j.bbamcr.2020.118740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 05/01/2020] [Accepted: 05/08/2020] [Indexed: 10/24/2022]
Abstract
Pontin, a member of the AAA+ ATPase family, plays important roles in a variety of cellular processes, including transcription regulation, DNA damage response, telomerase activity, and cellular transformation. In the previous studies, Pontin deletion in mice was lethal to embryos. Here, we demonstrate that the depletion of Pontin induced cellular senescence in mouse and human fibroblasts as well as in mouse epidermal keratinocytes. Fibroblast cells with Pontin depletion exhibited a defect in cell proliferation without showing apoptosis. Instead, they exhibited senescence-associated phenotypes including increased senescence-associated-β-galactosidase activity, elevated levels of p16INK4, and senescence-associated secretory phenotypes. Furthermore, conditional deletion of the Pontin gene in epidermal keratinocytes led to abnormal epidermal stratification, which was accompanied by the induction of senescence in Pontin-lacking cells. We found that Pontin depletion induced a spontaneous DNA damage response, which may be a cause of senescence. Contrary to the behavior of normal cells, Pontin depletion in several cancer cells caused apoptotic cell death without exhibiting senescence phenotypes.
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Affiliation(s)
- Koog Chan Park
- Department of Biological Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea; Research Institute of Women's Health, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Joo Hyeon Park
- Department of Biological Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea; Research Institute of Women's Health, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Sung Hee Baek
- Creative Research Initiatives Center for Epigenetic Code and Diseases, School of Biological Sciences, Seoul National University, Seoul 08826, South Korea
| | - Keun Il Kim
- Department of Biological Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea; Research Institute of Women's Health, Sookmyung Women's University, Seoul 04310, Republic of Korea.
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Shevchenko V, Arnotskaya N, Zaitsev S, Sharma A, Sharma HS, Bryukhovetskiy A, Pak O, Khotimchenko Y, Bryukhovetskiy I. Proteins of Wnt signaling pathway in cancer stem cells of human glioblastoma. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2020; 151:185-200. [PMID: 32448607 DOI: 10.1016/bs.irn.2020.03.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
RATIONALE Glioblastoma multiforme (GBM) is the most aggressive primary glial brain tumor. The prognosis for GBM patients is not favorable, with the median survival time being 15 months. Its treatment resistance is associated with GBM cell population having cancer stem cells (CSCs). Wnt/β-catenin signaling pathway is a strategically important molecular mechanism, providing proliferation of stem cells of all types. This study compares the expression levels of signaling pathway proteins in CD133(+) CSCs and CD133(-) differentiated glioblastoma cells (DGCs). MATERIALS AND METHODS the present study used U-87MG cells of human glioblastoma, the material was tested for mycoplasma contamination. High-performance liquid chromatography (HPLC) mass spectrometry was used for proteome analysis. Biological and molecular functions, signaling pathways and protein-protein interactions were analyzed using free-access databases: PubMed, PANTHER, Gene Ontology, Swiss-Prot and KEGG. Protein-protein interactions (PPIs) were analyzed using the STRING database (version 10). RESULTS There were identified 589 proteins with significantly changed expression in CD133+ CSCs, as compared with CD133-DGCs (P<0.05). Bioinformatics analysis allowed to attribute 134 differentially expressed proteins to 16 signaling pathways. A significant increase in expression of eight Wnt signaling pathway proteins (APC, CSNK1E, CSNK1A, CSNK2A2, CSNK2B, CTNNB1, DVL1, RUVBL) was detected, as well as four proteins of the non-canonical Wnt pathway-RHOA, ROCK2, RAC2, DAAM1. Special attention should be paid to β-catenin (CTNNB1) with more than 13.98-fold increase of expression in CSCs and Disheveled-associated activator of morphogenesis 1 (DAAM1) with 6.15-fold higher upregulation level. CONCLUSION proteins of Wnt/β-catenin signaling cascade are a prospective target for regulating CSCs activity.
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Affiliation(s)
- Valeriy Shevchenko
- Department of Fundamental Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia; Laboratory of Oncoproteomics, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia, Moscow, Russia
| | - Natalia Arnotskaya
- Laboratory of Oncoproteomics, Institute of Carcinogenesis, N.N. Blokhin National Medical Research Center of Oncology, Ministry of Health of Russia, Moscow, Russia
| | - Sergei Zaitsev
- Department of Fundamental Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
| | - Aruna Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, University Hospital, Uppsala University, S-75185 Uppsala, Sweden
| | - Hari Shanker Sharma
- International Experimental Central Nervous System Injury & Repair (IECNSIR), Department of Surgical Sciences, Anesthesiology & Intensive Care Medicine, University Hospital, Uppsala University, S-75185 Uppsala, Sweden
| | - Andrey Bryukhovetskiy
- NeuroVita Clinic of Interventional and Restorative Neurology and Therapy, Moscow, Russia
| | - Oleg Pak
- Medical Center, Far Eastern Federal University, Vladivostok, Russia
| | - Yuri Khotimchenko
- Department of Fundamental Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia; Laboratory of Pharmacology, National Scientific Center of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
| | - Igor Bryukhovetskiy
- Department of Fundamental Medicine, School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia; Laboratory of Pharmacology, National Scientific Center of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia.
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Ju D, Zhang W, Yan J, Zhao H, Li W, Wang J, Liao M, Xu Z, Wang Z, Zhou G, Mei L, Hou N, Ying S, Cai T, Chen S, Xie X, Lai L, Tang C, Park N, Takahashi JS, Huang N, Qi X, Zhang EE. Chemical perturbations reveal that RUVBL2 regulates the circadian phase in mammals. Sci Transl Med 2020; 12:12/542/eaba0769. [DOI: 10.1126/scitranslmed.aba0769] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 04/13/2020] [Indexed: 12/12/2022]
Abstract
Transcriptional regulation lies at the core of the circadian clockwork, but how the clock-related transcription machinery controls the circadian phase is not understood. Here, we show both in human cells and in mice that RuvB-like ATPase 2 (RUVBL2) interacts with other known clock proteins on chromatin to regulate the circadian phase. Pharmacological perturbation of RUVBL2 with the adenosine analog compound cordycepin resulted in a rapid-onset 12-hour clock phase-shift phenotype at human cell, mouse tissue, and whole-animal live imaging levels. Using simple peripheral injection treatment, we found that cordycepin penetrated the blood-brain barrier and caused rapid entrainment of the circadian phase, facilitating reduced duration of recovery in a mouse jet-lag model. We solved a crystal structure for human RUVBL2 in complex with a physiological metabolite of cordycepin, and biochemical assays showed that cordycepin treatment caused disassembly of an interaction between RUVBL2 and the core clock component BMAL1. Moreover, we showed with spike-in ChIP-seq analysis and binding assays that cordycepin treatment caused disassembly of the circadian super-complex, which normally resides at E-box chromatin loci such as PER1, PER2, DBP, and NR1D1. Mathematical modeling supported that the observed type 0 phase shifts resulted from derepression of E-box clock gene transcription.
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Affiliation(s)
- Dapeng Ju
- National Institute of Biological Sciences, Beijing 102206, China
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Wei Zhang
- RPXDs (Suzhou) Co. Ltd., Suzhou City, Jiangsu Province 215028, China
| | - Jiawei Yan
- School of Life Sciences, Peking University, Beijing 100871, China
| | - Haijiao Zhao
- National Institute of Biological Sciences, Beijing 102206, China
| | - Wei Li
- RPXDs (Suzhou) Co. Ltd., Suzhou City, Jiangsu Province 215028, China
| | - Jiawen Wang
- National Institute of Biological Sciences, Beijing 102206, China
| | - Meimei Liao
- National Institute of Biological Sciences, Beijing 102206, China
- College of Biological Sciences, China Agricultural University, Beijing 100193, China
| | - Zhancong Xu
- National Institute of Biological Sciences, Beijing 102206, China
| | - Zhiqiang Wang
- National Institute of Biological Sciences, Beijing 102206, China
| | - Guanshen Zhou
- National Institute of Biological Sciences, Beijing 102206, China
| | - Long Mei
- National Institute of Biological Sciences, Beijing 102206, China
- School of Life Sciences, Peking University, Beijing 100871, China
| | - Nannan Hou
- National Institute of Biological Sciences, Beijing 102206, China
| | - Shuhua Ying
- National Institute of Biological Sciences, Beijing 102206, China
| | - Tao Cai
- National Institute of Biological Sciences, Beijing 102206, China
| | - She Chen
- National Institute of Biological Sciences, Beijing 102206, China
| | - Xiaowen Xie
- School of Life Sciences, Peking University, Beijing 100871, China
- Center for Quantitative Biology, Peking University, Beijing 100871, China
| | - Luhua Lai
- Center for Quantitative Biology, Peking University, Beijing 100871, China
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chao Tang
- Center for Quantitative Biology, Peking University, Beijing 100871, China
- School of Physics and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
| | - Noheon Park
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390-9111, USA
| | - Joseph S. Takahashi
- Department of Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390-9111, USA
- Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390-9111, USA
| | - Niu Huang
- National Institute of Biological Sciences, Beijing 102206, China
- Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - Xiangbing Qi
- National Institute of Biological Sciences, Beijing 102206, China
- Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
| | - Eric Erquan Zhang
- National Institute of Biological Sciences, Beijing 102206, China
- Tsinghua Institute of Multidisciplinary Biomedical Research, Tsinghua University, Beijing 102206, China
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62
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Nano N, Ugwu F, Seraphim TV, Li T, Azer G, Isaac M, Prakesch M, Barbosa LRS, Ramos CHI, Datti A, Houry WA. Sorafenib as an Inhibitor of RUVBL2. Biomolecules 2020; 10:biom10040605. [PMID: 32295120 PMCID: PMC7226205 DOI: 10.3390/biom10040605] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/06/2020] [Accepted: 04/10/2020] [Indexed: 12/19/2022] Open
Abstract
RUVBL1 and RUVBL2 are highly conserved ATPases that belong to the AAA+ (ATPases Associated with various cellular Activities) superfamily and are involved in various complexes and cellular processes, several of which are closely linked to oncogenesis. The proteins were implicated in DNA damage signaling and repair, chromatin remodeling, telomerase activity, and in modulating the transcriptional activities of proto-oncogenes such as c-Myc and β-catenin. Moreover, both proteins were found to be overexpressed in several different types of cancers such as breast, lung, kidney, bladder, and leukemia. Given their various roles and strong involvement in carcinogenesis, the RUVBL proteins are considered to be novel targets for the discovery and development of therapeutic cancer drugs. Here, we describe the identification of sorafenib as a novel inhibitor of the ATPase activity of human RUVBL2. Enzyme kinetics and surface plasmon resonance experiments revealed that sorafenib is a weak, mixed non-competitive inhibitor of the protein’s ATPase activity. Size exclusion chromatography and small angle X-ray scattering data indicated that the interaction of sorafenib with RUVBL2 does not cause a significant effect on the solution conformation of the protein; however, the data suggested that the effect of sorafenib on RUVBL2 activity is mediated by the insertion domain in the protein. Sorafenib also inhibited the ATPase activity of the RUVBL1/2 complex. Hence, we propose that sorafenib could be further optimized to be a potent inhibitor of the RUVBL proteins.
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Affiliation(s)
- Nardin Nano
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
| | - Francisca Ugwu
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
| | - Thiago V. Seraphim
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
| | - Tangzhi Li
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
| | - Gina Azer
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
| | - Methvin Isaac
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, ON M5G 0A3, Canada; (M.I.); (M.P.)
| | - Michael Prakesch
- Drug Discovery Program, Ontario Institute for Cancer Research, Toronto, ON M5G 0A3, Canada; (M.I.); (M.P.)
| | | | - Carlos H. I. Ramos
- Institute of Chemistry, University of Campinas UNICAMP, Campinas SP 13083-970, Brazil;
| | - Alessandro Datti
- Department of Agriculture, Food, and Environmental Sciences, University of Perugia, 06121 Perugia, Italy;
| | - Walid A. Houry
- Department of Biochemistry, University of Toronto, Toronto, ON M5G 1M1, Canada; (N.N.); (F.U.); (T.V.S.); (T.L.); (G.A.)
- Department of Chemistry, University of Toronto, Toronto, ON M5S 3H6, Canada
- Correspondence: ; Tel.: +(416)-946-7141; Fax: +(416)-978-8548
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63
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Role of Rad51 and DNA repair in cancer: A molecular perspective. Pharmacol Ther 2020; 208:107492. [PMID: 32001312 DOI: 10.1016/j.pharmthera.2020.107492] [Citation(s) in RCA: 53] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/13/2020] [Accepted: 01/22/2020] [Indexed: 12/24/2022]
Abstract
The maintenance of genome integrity is essential for any organism survival and for the inheritance of traits to offspring. To the purpose, cells have developed a complex DNA repair system to defend the genetic information against both endogenous and exogenous sources of damage. Accordingly, multiple repair pathways can be aroused from the diverse forms of DNA lesions, which can be effective per se or via crosstalk with others to complete the whole DNA repair process. Deficiencies in DNA healing resulting in faulty repair and/or prolonged DNA damage can lead to genes mutations, chromosome rearrangements, genomic instability, and finally carcinogenesis and/or cancer progression. Although it might seem paradoxical, at the same time such defects in DNA repair pathways may have therapeutic implications for potential clinical practice. Here we provide an overview of the main DNA repair pathways, with special focus on the role played by homologous repair and the RAD51 recombinase protein in the cellular DNA damage response. We next discuss the recombinase structure and function per se and in combination with all its principal mediators and regulators. Finally, we conclude with an analysis of the manifold roles that RAD51 plays in carcinogenesis, cancer progression and anticancer drug resistance, and conclude this work with a survey of the most promising therapeutic strategies aimed at targeting RAD51 in experimental oncology.
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64
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Telomere-associated genes and telomeric lncRNAs are biomarker candidates in lung squamous cell carcinoma (LUSC). Exp Mol Pathol 2019; 112:104354. [PMID: 31837325 DOI: 10.1016/j.yexmp.2019.104354] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/28/2019] [Accepted: 12/06/2019] [Indexed: 12/13/2022]
Abstract
In the past decade, research efforts were made to identify molecular biomarkers useful as therapeutic targets in Non-Small Cell Lung Cancer (NSCLC), the most frequent type of lung carcinoma. NSCLC presents different histological subtypes being the most prevalent LUSC (Lung Squamous Cell Cancer) and LUAD (Lung Adenocarcinoma), and only a subset of LUAD patients' present tumors expressing known targetable genetic alterations. Telomeres and its components, including telomerase, the enzyme that replenishes telomeres, have been considered potential cancer biomarkers due to their crucial role in cell proliferation and genome stability. Our study aims to quantify expression changes affecting telomere-associated genes and ncRNAs associated with telomere regulation and maintenance in NSCLC. We first assessed the transcriptome (RNA-Seq) data of NSCLC patients from The Cancer Genome Atlas (TCGA) and then we tested the expression of telomere-associated genes and telomeric ncRNAs (TERC, telomerase RNA component, and TERRA, telomere repeat-containing RNA) in Brazilian NCSLC patient samples by quantitative RT-PCR, using matched normal adjacent tissue samples as the control. We also estimated the mean size of terminal restriction fragments (TRF) of some Brazilian NSCLC patients using telomeric Southern blot. The TCGA analysis identified alterations in the expression profile of TERT and telomere damage repair genes, mainly in the LUSC subtype. The study of Brazilian NSCLC samples by RT-qPCR showed that LUSC and LUAD express high amounts of TERT and that although the mean TRF size of tumor samples was shorter compared to normal cells, telomeres in NSCLC are probably maintained by telomerase. Also, the expression analysis of Brazilian NSCLC samples identified statistically significant alterations in the expression of genes involved with telomere damage repair, as well as in TERC and TERRA, mainly in the LUSC subtype. We, therefore, concluded that telomere maintenance genes are significantly deregulated in NSCLC, representing potential biomarkers in the LUSC subtype.
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65
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Mello T, Materozzi M, Zanieri F, Simeone I, Ceni E, Bereshchenko O, Polvani S, Tarocchi M, Marroncini G, Nerlov C, Guasti D, Bani D, Pinzani M, Galli A. Liver haploinsufficiency of RuvBL1 causes hepatic insulin resistance and enhances hepatocellular carcinoma progression. Int J Cancer 2019; 146:3410-3422. [PMID: 31721195 DOI: 10.1002/ijc.32787] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 10/22/2019] [Accepted: 10/28/2019] [Indexed: 12/29/2022]
Abstract
RuvBL1 is an AAA+ ATPase whose expression in hepatocellular carcinoma (HCC) correlates with a poor prognosis. In vitro models suggest that targeting RuvBL1 could be an effective strategy against HCC. However, the role of RuvBL1 in the onset and progression of HCC remains unknown. To address this question, we developed a RuvBL1hep+/- mouse model and evaluated the outcome of DEN-induced liver carcinogenesis up to 12 months of progression. We found that RuvBL1 haploinsufficiency initially delayed the onset of liver cancer, due to a reduced hepatocyte turnover in RuvBL1hep+/- mice. However, RuvBL1hep+/- mice eventually developed HCC nodules that, with aging, grew larger than in the control mice. Moreover, RuvBL1hep+/- mice developed hepatic insulin resistance and impaired glucose homeostasis. We could determine that RuvBL1 regulates insulin signaling through the Akt/mTOR pathway in liver physiology in vivo as well as in normal hepatocytic and HCC cells in vitro. Whole transcriptome analysis of mice livers confirmed the major role of RuvBL1 in the regulation of hepatic glucose metabolism. Finally, RuvBL1 expression was found significantly correlated to glucose metabolism and mTOR signaling by bioinformatic analysis of human HCC sample from the publicly available TGCA database. These data uncover a role of RuvBL1 at the intersection of liver metabolism, hepatocyte proliferation and HCC development, providing a molecular rationale for its overexpression in liver cancer.
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Affiliation(s)
- Tommaso Mello
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Maria Materozzi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Francesca Zanieri
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Irene Simeone
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Elisabetta Ceni
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | | | - Simone Polvani
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Mirko Tarocchi
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Giada Marroncini
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - Claus Nerlov
- MRC Molecular Hematology Unit, Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Daniele Guasti
- Department of Clinical and Experimental Medicine, University of Florence, Florence, Italy
| | - Daniele Bani
- Department of Clinical and Experimental Medicine, University of Florence, Florence, Italy
| | - Massimo Pinzani
- UCL Institute for Liver and Digestive Health, London, United Kingdom
| | - Andrea Galli
- Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
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66
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Hasan N, Ahuja N. The Emerging Roles of ATP-Dependent Chromatin Remodeling Complexes in Pancreatic Cancer. Cancers (Basel) 2019; 11:E1859. [PMID: 31769422 PMCID: PMC6966483 DOI: 10.3390/cancers11121859] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 11/19/2019] [Accepted: 11/20/2019] [Indexed: 02/08/2023] Open
Abstract
Pancreatic cancer is an aggressive cancer with low survival rates. Genetic and epigenetic dysregulation has been associated with the initiation and progression of pancreatic tumors. Multiple studies have pointed to the involvement of aberrant chromatin modifications in driving tumor behavior. ATP-dependent chromatin remodeling complexes regulate chromatin structure and have critical roles in stem cell maintenance, development, and cancer. Frequent mutations and chromosomal aberrations in the genes associated with subunits of the ATP-dependent chromatin remodeling complexes have been detected in different cancer types. In this review, we summarize the current literature on the genomic alterations and mechanistic studies of the ATP-dependent chromatin remodeling complexes in pancreatic cancer. Our review is focused on the four main subfamilies: SWItch/sucrose non-fermentable (SWI/SNF), imitation SWI (ISWI), chromodomain-helicase DNA-binding protein (CHD), and INOsitol-requiring mutant 80 (INO80). Finally, we discuss potential novel treatment options that use small molecules to target these complexes.
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Affiliation(s)
| | - Nita Ahuja
- Department of Surgery, Yale University School of Medicine, New Haven, CT 06520, USA;
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67
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Yan T, Liu F, Gao J, Lu H, Cai J, Zhao X, Sun Y. Multilevel regulation of RUVBL2 expression predicts poor prognosis in hepatocellular carcinoma. Cancer Cell Int 2019; 19:249. [PMID: 31572066 PMCID: PMC6764127 DOI: 10.1186/s12935-019-0974-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 09/23/2019] [Indexed: 12/24/2022] Open
Abstract
Background Hepatocellular carcinoma (HCC) is the second-most lethal cancer worldwide with a complex pathogenesis. RuvB-like 2 (RUVBL2) was previously found to contribute to hepatocarcinogenesis. However, its expression, regulation and clinical significance have not been systematically evaluated in a large number of clinical samples. Methods Here, we performed a comprehensive analysis of RUVBL2 based on multiple datasets from 371 liver cancer patients of The Cancer Genome Atlas (TCGA) and on immunohistochemical staining in 153 subjects. In addition, the aberrant signaling pathways caused by RUVBL2 overexpression were investigated. Results We demonstrated that promoter hypomethylation, copy number gain, MYC amplification and CTNNB1 mutation were all responsible for RUVBL2 overexpression in HCC. High levels of RUVBL2 mRNA were associated with shorter recurrence-free survival time (RFS) but not overall survival time (OS). Furthermore, RUVBL2 protein was overexpressed in the nucleus and cytoplasm of HCC samples. Univariate and multivariate survival analyses showed that strong nuclear and cytoplasmic staining of RUVBL2 independently predicted worse OS and RFS with a 2.03-fold and a 1.71-fold increase in the hazard ratio, respectively. High levels of RUVBL2 promoted carcinogenesis through the heat shock protein 90 (HSP90)-Cell Division Cycle 37 (CDC37), AKT serine/threonine kinase (AKT) and mitogen-activated protein kinase (ERK/MAPK) pathways. Conclusion The deregulation of RUVBL2 in HCC is influenced at the genomic, epigenetic and transcriptional levels. Our findings highlight the potential roles of RUVBL2 as a promising prognostic marker as well as a therapeutic target for HCC.
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Affiliation(s)
- Tao Yan
- 1Department of Anesthesiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, 100021 China
| | - Fang Liu
- 2State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing, 100021 China
| | - Jiajia Gao
- 2State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing, 100021 China
| | - Haizhen Lu
- 3Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, 100021 China
| | - Jianqiang Cai
- 4Department of Hepatobiliary Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Science & Peking Union Medical College, Beijing, 100021 China
| | - Xiaohang Zhao
- 2State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing, 100021 China
| | - Yulin Sun
- 2State Key Laboratory of Molecular Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing, 100021 China
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68
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Balic JJ, Garama DJ, Saad MI, Yu L, West AC, West AJ, Livis T, Bhathal PS, Gough DJ, Jenkins BJ. Serine-Phosphorylated STAT3 Promotes Tumorigenesis via Modulation of RNA Polymerase Transcriptional Activity. Cancer Res 2019; 79:5272-5287. [PMID: 31481496 DOI: 10.1158/0008-5472.can-19-0974] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 07/24/2019] [Accepted: 08/28/2019] [Indexed: 11/16/2022]
Abstract
Deregulated activation of the latent oncogenic transcription factor STAT3 in many human epithelial malignancies, including gastric cancer, has invariably been associated with its canonical tyrosine phosphorylation and enhanced transcriptional activity. By contrast, serine phosphorylation (pS) of STAT3 can augment its nuclear transcriptional activity and promote essential mitochondrial functions, yet the role of pS-STAT3 among epithelial cancers is ill-defined. Here, we reveal that genetic ablation of pS-STAT3 in the gp130 F/F spontaneous gastric cancer mouse model and human gastric cancer cell line xenografts abrogated tumor growth that coincided with reduced proliferative potential of the tumor epithelium. Microarray gene expression profiling demonstrated that the suppressed gastric tumorigenesis in pS-STAT3-deficient gp130 F/F mice associated with reduced transcriptional activity of STAT3-regulated gene networks implicated in cell proliferation and migration, inflammation, and angiogenesis, but not mitochondrial function or metabolism. Notably, the protumorigenic activity of pS-STAT3 aligned with its capacity to primarily augment RNA polymerase II-mediated transcriptional elongation, but not initiation, of STAT3 target genes. Furthermore, by using a combinatorial in vitro and in vivo proteomics approach based on the rapid immunoprecipitation mass spectrometry of endogenous protein (RIME) assay, we identified RuvB-like AAA ATPase 1 (RUVBL1/Pontin) and enhancer of rudimentary homolog (ERH) as interacting partners of pS-STAT3 that are pivotal for its transcriptional activity on STAT3 target genes. Collectively, these findings uncover a hitherto unknown transcriptional role and obligate requirement for pS-STAT3 in gastric cancer that could be extrapolated to other STAT3-driven cancers. SIGNIFICANCE: These findings reveal a new transcriptional role and mandatory requirement for constitutive STAT3 serine phosphorylation in gastric cancer.
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Affiliation(s)
- Jesse J Balic
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Daniel J Garama
- Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia.,Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Mohamed I Saad
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Liang Yu
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Alison C West
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Alice J West
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Thaleia Livis
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia.,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Prithi S Bhathal
- Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
| | - Daniel J Gough
- Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia. .,Centre for Cancer Research, Hudson Institute of Medical Research, Clayton, Victoria, Australia
| | - Brendan J Jenkins
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Clayton, Victoria, Australia. .,Department of Molecular and Translational Science, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Victoria, Australia
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69
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The AAA+ATPase RUVBL2 is essential for the oncogenic function of c-MYB in acute myeloid leukemia. Leukemia 2019; 33:2817-2829. [PMID: 31138842 PMCID: PMC6887538 DOI: 10.1038/s41375-019-0495-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 04/12/2019] [Accepted: 04/17/2019] [Indexed: 02/06/2023]
Abstract
Subtype-specific leukemia oncogenes drive aberrant gene expression profiles that converge on common essential mediators to ensure leukemia self-renewal and inhibition of differentiation. The transcription factor c-MYB functions as one such mediator in a diverse range of leukemias. Here we show for the first time that transcriptional repression of myeloid differentiation associated c-MYB target genes in AML is enforced by the AAA+ ATPase RUVBL2. Silencing RUVBL2 expression resulted in increased binding of c-MYB to these loci and their transcriptional activation. RUVBL2 inhibition resulted in AML cell apoptosis and severely impaired disease progression of established AML in engrafted mice. In contrast, such inhibition had little impact on normal hematopoietic progenitor differentiation. These data demonstrate that RUVBL2 is essential for the oncogenic function of c-MYB in AML by governing inhibition of myeloid differentiation. They also indicate that targeting the control of c-MYB function by RUVBL2 is a promising approach to developing future anti-AML therapies.
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70
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The R2TP complex regulates paramyxovirus RNA synthesis. PLoS Pathog 2019; 15:e1007749. [PMID: 31121004 PMCID: PMC6532945 DOI: 10.1371/journal.ppat.1007749] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 04/05/2019] [Indexed: 12/12/2022] Open
Abstract
The regulation of paramyxovirus RNA synthesis by host proteins is poorly understood. Here, we identified a novel regulation mechanism of paramyxovirus RNA synthesis by the Hsp90 co-chaperone R2TP complex. We showed that the R2TP complex interacted with the paramyxovirus polymerase L protein and that silencing of the R2TP complex led to uncontrolled upregulation of mumps virus (MuV) gene transcription but not genome replication. Regulation by the R2TP complex was critical for MuV replication and evasion of host innate immune responses. The R2TP complex also regulated measles virus (MeV) RNA synthesis, but its function was inhibitory and not beneficial to MeV, as MeV evaded host innate immune responses in the absence of the R2TP complex. The identification of the R2TP complex as a critical host factor sheds new light on the regulation of paramyxovirus RNA synthesis. The family Paramyxoviridae includes several important human and animal pathogens such as mumps virus (MuV) and measles virus (MeV). Paramyxovirus RNA synthesis is strictly regulated by both viral and host proteins. In this study, we identified the R2TP complex as a novel host factor regulating paramyxovirus RNA synthesis. The R2TP complex is a Hsp90 co-chaperone and is involved in Hsp90-mediated assembly of large protein complexes. We showed that the R2TP complex precisely regulated MuV transcription by interacting with the polymerase L protein. This regulation was critical for MuV evasion of host innate immune responses and for viral replication. We also showed that the R2TP complex regulated MeV RNA synthesis, but that its function was inhibitory and not beneficial to MeV. Our findings support a novel regulation mechanism of paramyxovirus RNA synthesis that is directly relevant to its biology and life cycle, and provide the first evidence linking the R2TP complex to defense against viral infection.
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71
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Alnafakh RAA, Adishesh M, Button L, Saretzki G, Hapangama DK. Telomerase and Telomeres in Endometrial Cancer. Front Oncol 2019; 9:344. [PMID: 31157162 PMCID: PMC6533802 DOI: 10.3389/fonc.2019.00344] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Accepted: 04/15/2019] [Indexed: 12/11/2022] Open
Abstract
Telomeres at the termini of human chromosomes are shortened with each round of cell division due to the “end replication problem” as well as oxidative stress. During carcinogenesis, cells acquire or retain mechanisms to maintain telomeres to avoid initiation of cellular senescence or apoptosis and halting cell division by critically short telomeres. The unique reverse transcriptase enzyme complex, telomerase, catalyzes the maintenance of telomeres but most human somatic cells do not have sufficient telomerase activity to prevent telomere shortening. Tissues with high and prolonged replicative potential demonstrate adequate cellular telomerase activity to prevent telomere erosion, and high telomerase activity appears to be a critical feature of most (80–90%) epithelial cancers, including endometrial cancer. Endometrial cancers regress in response to progesterone which is frequently used to treat advanced endometrial cancer. Endometrial telomerase is inhibited by progestogens and deciphering telomere and telomerase biology in endometrial cancer is therefore important, as targeting telomerase (a downstream target of progestogens) in endometrial cancer may provide novel and more effective therapeutic avenues. This review aims to examine the available evidence for the role and importance of telomere and telomerase biology in endometrial cancer.
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Affiliation(s)
- Rafah A A Alnafakh
- Liverpool Women's Hospital NHS Foundation Trust, Liverpool, United Kingdom.,Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Meera Adishesh
- Liverpool Women's Hospital NHS Foundation Trust, Liverpool, United Kingdom.,Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Lucy Button
- Liverpool Women's Hospital NHS Foundation Trust, Liverpool, United Kingdom.,Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
| | - Gabriele Saretzki
- The Ageing Biology Centre and Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Dharani K Hapangama
- Liverpool Women's Hospital NHS Foundation Trust, Liverpool, United Kingdom.,Department of Women's and Children's Health, Institute of Translational Medicine, University of Liverpool, Liverpool, United Kingdom
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72
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Panas MW, Naor A, Cygan AM, Boothroyd JC. Toxoplasma Controls Host Cyclin E Expression through the Use of a Novel MYR1-Dependent Effector Protein, HCE1. mBio 2019; 10:e00674-19. [PMID: 31040242 PMCID: PMC6495377 DOI: 10.1128/mbio.00674-19] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 03/25/2019] [Indexed: 01/27/2023] Open
Abstract
Toxoplasma gondii is an obligate intracellular parasite that establishes a favorable environment in the host cells in which it replicates. We have previously reported that it uses MYR-dependent translocation of dense granule proteins to elicit a key set of host responses related to the cell cycle, specifically, E2F transcription factor targets, including cyclin E. We report here the identification of a novel Toxoplasma effector protein that is exported from the parasitophorous vacuole in a MYR1-dependent manner and localizes to the host's nucleus. Parasites lacking this inducer of host cyclin E (HCE1) are unable to modulate E2F transcription factor target genes and exhibit a substantial growth defect. Immunoprecipitation of HCE1 from infected host cells showed that HCE1 efficiently binds elements of the cyclin E regulatory complex, namely, DP1 and its partners E2F3 and E2F4. Expression of HCE1 in Neospora caninum, or in uninfected human foreskin fibroblasts (HFFs), showed localization of the expressed protein to the host nuclei and strong cyclin E upregulation. Thus, HCE1 is a novel effector protein that is necessary and sufficient to impact the E2F axis of transcription, resulting in co-opting of host functions to the advantage of ToxoplasmaIMPORTANCE Like most Apicomplexan parasites, Toxoplasma gondii has the remarkable ability to invade and establish a replicative niche within another eukaryotic cell, in this case, any of a large number of cell types in almost any warm-blooded animals. Part of the process of establishing this niche is the export of effector proteins to co-opt host cell functions in favor of the parasite. Here we identify a novel effector protein, HCE1, that the parasites export into the nucleus of human cells, where it modulates the expression of multiple genes, including the gene encoding cyclin E, one of the most crucial proteins involved in controlling when and whether a human cell divides. We show that HCE1 works through binding to specific transcription factors, namely, E2F3, E2F4, and DP1, that normally carefully regulate these all-important pathways. This represents a new way in which these consummately efficient infectious agents co-opt the human cells that they so efficiently grow within.
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Affiliation(s)
- Michael W Panas
- Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA
| | - Adit Naor
- Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA
| | - Alicja M Cygan
- Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA
| | - John C Boothroyd
- Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA
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73
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Schořová Š, Fajkus J, Záveská Drábková L, Honys D, Schrumpfová PP. The plant Pontin and Reptin homologues, RuvBL1 and RuvBL2a, colocalize with TERT and TRB proteins in vivo, and participate in telomerase biogenesis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 98:195-212. [PMID: 30834599 DOI: 10.1111/tpj.14306] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 02/08/2019] [Accepted: 02/26/2019] [Indexed: 05/15/2023]
Abstract
Telomerase maturation and recruitment to telomeres is regulated by several telomerase- and telomere-associated proteins. Among a number of proteins, human Pontin and Reptin play critical roles in telomerase biogenesis. Here we characterized plant orthologues of Pontin and Reptin, RuvBL1 and RuvBL2a, respectively, and show association of Arabidopsis thaliana RuvBL1 (AtRuvBL1) with the catalytic subunit of telomerase (AtTERT) in the nucleolus in vivo. In contrast to mammals, interactions between AtTERT and AtRuvBL proteins in A. thaliana are not direct and they are rather mediated by one of the Arabidopsis thaliana Telomere Repeat Binding (AtTRB) proteins. We further show that plant orthologue of dyskerin, named AtCBF5, is indirectly associated with AtTRB proteins but not with the AtRuvBL proteins in the plant nucleus/nucleolus, and interacts with the Protection of telomere 1 (AtPOT1a) in the nucleolus or cytoplasmic foci. Our genome-wide phylogenetic analyses identify orthologues in RuvBL protein family within the plant kingdom. Dysfunction of AtRuvBL genes in heterozygous T-DNA insertion A. thaliana mutants results in reduced telomerase activity and indicate the involvement of AtRuvBL in plant telomerase biogenesis.
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Affiliation(s)
- Šárka Schořová
- Laboratory of Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Jiří Fajkus
- Laboratory of Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
- Mendel Centre for Plant Genomics and Proteomics, Central European Institute of Technology, Masaryk University, Brno, Czech Republic
- Institute of Biophysics of the Czech Academy of Sciences, v.v.i., Brno, Czech Republic
| | - Lenka Záveská Drábková
- Laboratory of Pollen Biology, Institute of Experimental Botany of the Czech Academy of Sciences, v.v.i., Prague, Czech Republic
| | - David Honys
- Laboratory of Pollen Biology, Institute of Experimental Botany of the Czech Academy of Sciences, v.v.i., Prague, Czech Republic
| | - Petra Procházková Schrumpfová
- Laboratory of Functional Genomics and Proteomics, National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, Czech Republic
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74
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Using chemical inhibitors to probe AAA protein conformational dynamics and cellular functions. Curr Opin Chem Biol 2019; 50:45-54. [PMID: 30913482 DOI: 10.1016/j.cbpa.2019.02.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 02/18/2019] [Accepted: 02/19/2019] [Indexed: 01/24/2023]
Abstract
The AAA proteins are a family of enzymes that play key roles in diverse dynamic cellular processes, ranging from proteostasis to directional intracellular transport. Dysregulation of AAA proteins has been linked to several diseases, including cancer, suggesting a possible therapeutic role for inhibitors of these enzymes. In the past decade, new chemical probes have been developed for AAA proteins including p97, dynein, midasin, and ClpC1. In this review, we discuss how these compounds have been used to study the cellular functions and conformational dynamics of AAA proteins. We discuss future directions for inhibitor development and early efforts to utilize AAA protein inhibitors in the clinical setting.
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75
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Vangala JR, Radhakrishnan SK. Nrf1-mediated transcriptional regulation of the proteasome requires a functional TIP60 complex. J Biol Chem 2018; 294:2036-2045. [PMID: 30559296 DOI: 10.1074/jbc.ra118.006290] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 12/03/2018] [Indexed: 12/15/2022] Open
Abstract
Inhibition of the proteasome leads to proteotoxic stress, which is characterized by the buildup of ubiquitinated proteins that cannot be degraded properly. The transcription factor Nrf1 (also called NFE2L1) counteracts proteotoxic stress by inducing transcription of proteasome subunit genes, resulting in the restoration of proteasome activity. Further understanding of the Nrf1 pathway is therefore of interest in both neurodegeneration, where proteasome activity could be enhanced, and cancer, where suppression of this pathway could potentiate the cell-killing effect mediated by proteasome inhibitor drugs. Here, to identify novel regulators of Nrf1, we performed an RNAi screen in an engineered cell line, reporting on Nrf1 transcriptional activity. In addition to validating known regulators, we discovered that the AAA+ ATPase RUVBL1 is necessary for Nrf1's transcriptional activity. Given that RUVBL1 is part of different multisubunit complexes that play key roles in transcription, we dissected this phenomenon further and found that the TIP60 chromatin-regulatory complex is essential for Nrf1-dependent transcription of proteasome genes. Consistent with these observations, Nrf1, RUVBL1, and TIP60 proteins were co-recruited to the promoter regions of proteasome genes after proteasome inhibitor treatments. More importantly, depletion of RUVBL1 or TIP60 in various cancer cells sensitized them to cell death induced by proteasome inhibition. Overall, our study provides a framework for manipulating the TIP60-Nrf1 axis to alter proteasome function in various human diseases, including cancer.
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Affiliation(s)
- Janakiram R Vangala
- From the Department of Pathology and Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298
| | - Senthil K Radhakrishnan
- From the Department of Pathology and Massey Cancer Center, Virginia Commonwealth University, Richmond, Virginia 23298
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76
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Lynham J, Houry WA. The Multiple Functions of the PAQosome: An R2TP- and URI1 Prefoldin-Based Chaperone Complex. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1106:37-72. [DOI: 10.1007/978-3-030-00737-9_4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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77
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Bragantini B, Rouillon C, Charpentier B, Manival X, Quinternet M. NMR assignment and solution structure of the external DII domain of the yeast Rvb2 protein. BIOMOLECULAR NMR ASSIGNMENTS 2018; 12:243-247. [PMID: 29569106 DOI: 10.1007/s12104-018-9816-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 03/20/2018] [Indexed: 06/08/2023]
Abstract
We report the nearly complete 1H, 15N and 13C resonance assignment and the solution structure of the external DII domain of the yeast Rvb2 protein, a member of the AAA+ATPase superfamily.
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Affiliation(s)
- Benoit Bragantini
- Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), UMR 7365 CNRS Université de Lorraine, Biopôle, Campus Biologie Santé, Vandœuvre-lès-Nancy, France
| | - Clément Rouillon
- Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), UMR 7365 CNRS Université de Lorraine, Biopôle, Campus Biologie Santé, Vandœuvre-lès-Nancy, France
| | - Bruno Charpentier
- Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), UMR 7365 CNRS Université de Lorraine, Biopôle, Campus Biologie Santé, Vandœuvre-lès-Nancy, France
| | - Xavier Manival
- Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), UMR 7365 CNRS Université de Lorraine, Biopôle, Campus Biologie Santé, Vandœuvre-lès-Nancy, France
| | - Marc Quinternet
- Ingénierie-Biologie-Santé Lorraine (IBSLor), UMS 2008, CNRS, INSERM, Université de Lorraine, Biopôle, Campus Biologie Santé, Vandœuvre-lès-Nancy, France.
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78
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Affiliation(s)
- Xingjun Wang
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, Shanghai Key Laboratory of Signaling and Diseases Research, School of Life Science and Technology, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
- Department of Neuroscience, Scripps Research Institute, Florida 130 Scripps Way Jupiter, Florida, 33458, USA.
| | - Xirui Huang
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, Shanghai Key Laboratory of Signaling and Diseases Research, School of Life Science and Technology, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Chenxi Wu
- College of Chinese Medicine, North China University of Science and Technology, 21 Bohai Road, Tangshan, 063210, China
| | - Lei Xue
- Institute of Intervention Vessel, Shanghai 10th People's Hospital, Shanghai Key Laboratory of Signaling and Diseases Research, School of Life Science and Technology, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
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79
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Javary J, Allain-Courtois N, Benhamouche-Trouillet S. La Reptine, nouvelle cible thérapeutique pour le syndrome métabolique et la stéatose hépatique. Med Sci (Paris) 2018; 34:637-639. [DOI: 10.1051/medsci/20183408002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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80
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Sen U, Saxena H, Khurana J, Nayak A, Gupta A. Plasmodium falciparum RUVBL3 protein: a novel DNA modifying enzyme and an interacting partner of essential HAT protein MYST. Sci Rep 2018; 8:10917. [PMID: 30026605 PMCID: PMC6053374 DOI: 10.1038/s41598-018-29137-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 06/26/2018] [Indexed: 11/09/2022] Open
Abstract
RUVBLs constitute a conserved group of ATPase proteins that play significant role in a variety of cellular processes including transcriptional regulation, cell cycle and DNA damage repair. Three RUVBL homologues, namely, PfRUVBL1, PfRUVBL2 and PfRUVBL3 have been identified in P. falciparum, unlike its eukaryotic counterparts, which have two RUVBL proteins (RUVBL1 & RUVBL2). The present study expands our understanding of PfRUVBL3 protein and thereby basic biology of Plasmodium in general. Here, we have shown that parasite PfRUVBL3 is a true homolog of human/yeast RUVBL2 protein. Our result show that PfRUVBL3 constitutively expresses throughout the stages of intra-erythrocytic cycle (IDC) with varied localization. In addition to ATPase and oligomerization activity, we have for the first time shown that PfRUVBL3 possess DNA cleavage activity which interestingly is dependent on its insertion domain. Furthermore, we have also identified RUVBL3 to be an interacting partner of an essential chromatin remodeling protein PfMYST and together they colocalize with H3K9me1 histone in parasitophorous vacuole during the ring stage of IDC suggesting their potential involvement in chromatin remodeling and gene transcription.
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Affiliation(s)
- Utsav Sen
- Department of Life Sciences, Shiv Nadar University, Greater Noida, 201314, India
| | - Himani Saxena
- Department of Life Sciences, Shiv Nadar University, Greater Noida, 201314, India
| | - Juhi Khurana
- Department of Life Sciences, Shiv Nadar University, Greater Noida, 201314, India
| | - Akshaykumar Nayak
- Department of Life Sciences, Shiv Nadar University, Greater Noida, 201314, India
| | - Ashish Gupta
- Department of Life Sciences, Shiv Nadar University, Greater Noida, 201314, India.
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81
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Wawrzynow B, Zylicz A, Zylicz M. Chaperoning the guardian of the genome. The two-faced role of molecular chaperones in p53 tumor suppressor action. Biochim Biophys Acta Rev Cancer 2018; 1869:161-174. [DOI: 10.1016/j.bbcan.2017.12.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 12/28/2017] [Accepted: 12/29/2017] [Indexed: 12/17/2022]
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82
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Gauthier MS, Cloutier P, Coulombe B. Role of the PAQosome in Regulating Arrangement of Protein Quaternary Structure in Health and Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1106:25-36. [PMID: 30484151 DOI: 10.1007/978-3-030-00737-9_3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The PAQosome, formerly known as the R2TP/PFDL complex, is an eleven-subunit cochaperone complex that assists HSP90 in the assembly of numerous large multisubunit protein complexes involved in essential cellular functions such as protein synthesis, ribosome biogenesis, transcription, splicing, and others. In this review, we discuss possible mechanisms of action and role of phosphorylation in the assembly of client complexes by the PAQosome as well as its potential role in cancer, ciliogenesis and ciliopathies.
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Affiliation(s)
| | | | - Benoit Coulombe
- Institut de Recherches Cliniques de Montréal, QC, Canada. .,Department of Biochemistry and Molecular Medicine, Université de Montréal, QC, Canada.
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83
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The PAQosome, an R2TP-Based Chaperone for Quaternary Structure Formation. Trends Biochem Sci 2017; 43:4-9. [PMID: 29203338 DOI: 10.1016/j.tibs.2017.11.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 10/31/2017] [Accepted: 11/01/2017] [Indexed: 01/19/2023]
Abstract
The Rvb1-Rvb2-Tah1-Pih1/prefoldin-like (R2TP/PFDL) complex is a unique chaperone that provides a platform for the assembly and maturation of many key multiprotein complexes in mammalian cells. Here, we propose to rename R2TP/PFDL as PAQosome (particle for arrangement of quaternary structure) to more accurately represent its unique function.
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