1
|
Qu Z, Pang X, Mei Z, Li Y, Zhang Y, Huang C, Liu K, Yu S, Wang C, Sun Z, Liu Y, Li X, Jia Y, Dong Y, Lu M, Ju T, Wu F, Huang M, Li N, Dou S, Jiang J, Dong X, Zhang Y, Li W, Yang B, Du W. The positive feedback loop of the NAT10/Mybbp1a/p53 axis promotes cardiomyocyte ferroptosis to exacerbate cardiac I/R injury. Redox Biol 2024; 72:103145. [PMID: 38583415 PMCID: PMC11002668 DOI: 10.1016/j.redox.2024.103145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Revised: 03/28/2024] [Accepted: 03/30/2024] [Indexed: 04/09/2024] Open
Abstract
Ferroptosis is a nonapoptotic form of regulated cell death that has been reported to play a central role in cardiac ischemia‒reperfusion (I/R) injury. N-acetyltransferase 10 (NAT10) contributes to cardiomyocyte apoptosis by functioning as an RNA ac4c acetyltransferase, but its role in cardiomyocyte ferroptosis during I/R injury has not been determined. This study aimed to elucidate the role of NAT10 in cardiac ferroptosis as well as the underlying mechanism. The mRNA and protein levels of NAT10 were increased in mouse hearts after I/R and in cardiomyocytes that were exposed to hypoxia/reoxygenation. P53 acted as an endogenous activator of NAT10 during I/R in a transcription-dependent manner. Cardiac overexpression of NAT10 caused cardiomyocyte ferroptosis to exacerbate I/R injury, while cardiomyocyte-specific knockout of NAT10 or pharmacological inhibition of NAT10 with Remodelin had the opposite effects. The inhibition of cardiomyocyte ferroptosis by Fer-1 exerted superior cardioprotective effects against the NAT10-induced exacerbation of post-I/R cardiac damage than the inhibition of apoptosis by emricasan. Mechanistically, NAT10 induced the ac4C modification of Mybbp1a, increasing its stability, which in turn activated p53 and subsequently repressed the transcription of the anti-ferroptotic gene SLC7A11. Moreover, knockdown of Mybbp1a partially abolished the detrimental effects of NAT10 overexpression on cardiomyocyte ferroptosis and cardiac I/R injury. Collectively, our study revealed that p53 and NAT10 interdependently cooperate to form a positive feedback loop that promotes cardiomyocyte ferroptosis to exacerbate cardiac I/R injury, suggesting that targeting the NAT10/Mybbp1a/p53 axis may be a novel approach for treating cardiac I/R.
Collapse
Affiliation(s)
- Zhezhe Qu
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Xiaochen Pang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Zhongting Mei
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Ying Li
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Yaozhi Zhang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Chuanhao Huang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Kuiwu Liu
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Shuting Yu
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Changhao Wang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Zhiyong Sun
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Yingqi Liu
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Xin Li
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Yingqiong Jia
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Yuechao Dong
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Meixi Lu
- Traditional Chinese Medicine School, Beijing University of Chinese Medicine, Beijing, China
| | - Tiantian Ju
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Fan Wu
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Min Huang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Na Li
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Shunkang Dou
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Jianhao Jiang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Xianhui Dong
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Yi Zhang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Wanhong Li
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China
| | - Baofeng Yang
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China; Northern Translational Medicine Research and Cooperation Center, Heilongjiang Academy of Medical Sciences, Harbin Medical University, Harbin, China; Research Unit of Noninfectious Chronic Diseases in Frigid Zone, Chinese Academy of Medical Sciences, 2019RU070, Harbin, China.
| | - Weijie Du
- State Key Laboratory of Frigid Zone Cardiovascular Diseases (SKLFZCD), Department of Pharmacology (State-Province Key Laboratories of Biomedicine-Pharmaceutics of China, Key Laboratory of Cardiovascular Research, Ministry of Education), College of Pharmacy, Harbin Medical University, Harbin, China; Northern Translational Medicine Research and Cooperation Center, Heilongjiang Academy of Medical Sciences, Harbin Medical University, Harbin, China; Research Unit of Noninfectious Chronic Diseases in Frigid Zone, Chinese Academy of Medical Sciences, 2019RU070, Harbin, China; Eye Hospital, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China.
| |
Collapse
|
2
|
Wang Z, Luo J, Huang H, Wang L, Lv T, Wang Z, Li C, Wang Y, Liu J, Cheng Q, Zuo X, Hu L, Ye M, Liu H, Song Y. NAT10-mediated upregulation of GAS5 facilitates immune cell infiltration in non-small cell lung cancer via the MYBBP1A-p53/IRF1/type I interferon signaling axis. Cell Death Discov 2024; 10:240. [PMID: 38762546 PMCID: PMC11102450 DOI: 10.1038/s41420-024-01997-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 04/23/2024] [Accepted: 04/29/2024] [Indexed: 05/20/2024] Open
Abstract
Interactions of tumor cells with immune cells in the tumor microenvironment play an important role during malignancy progression. We previously identified that GAS5 inhibited tumor development by suppressing proliferation of tumor cells in non-small cell lung cancer (NSCLC). Herein, we discovered a tumor-suppressing role for tumor cell-derived GAS5 in regulating tumor microenvironment. GAS5 positively coordinated with the infiltration of macrophages and T cells in NSCLC clinically, and overexpression of GAS5 promoted macrophages and T cells recruitment both in vitro and in vivo. Mechanistically, GAS5 stabilized p53 by directly binding to MYBBP1A and facilitating MYBBP1A-p53 interaction, and enhanced p53-mediated transcription of IRF1, which activated type I interferon signaling and increased the production of downstream CXCL10 and CCL5. We also found that activation of type I interferon signaling was associated with better immunotherapy efficacy in NSCLC. Furthermore, the stability of GAS5 was regulated by NAT10, the key enzyme responsible for N4-acetylcytidine (ac4C) modification, which bound to GAS5 and mediated its ac4C modification. Collectively, tumor cell-derived GAS5 could activate type I interferon signaling via the MYBBP1A-p53/IRF1 axis, promoting immune cell infiltration and potentially correlating with immunotherapy efficacy, which suppressed NSCLC progression. Our results suggested GAS5 as a promising predictive marker and potential therapeutic target for combination therapy in NSCLC. A schematic diagram demonstrating the regulatory effect of GAS5 on immune cell infiltration by activating type I interferon signaling via MYBBP1A-p53/IRF1 axis in non-small cell lung cancer. IFN, interferon.
Collapse
Affiliation(s)
- Zimu Wang
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
- Department of Respiratory and Critical Care Medicine, Nanjing Drum Tower Hospital, Nanjing University School of Medicine, Nanjing, 210008, China
| | - Jing Luo
- Department of Cardiothoracic Surgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Hairong Huang
- Department of Cardiothoracic Surgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Li Wang
- Nanjing Medical University, Nanjing, 211166, China
| | - Tangfeng Lv
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Zhaofeng Wang
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Chuling Li
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Nanjing Medical University, Nanjing, 210002, China
| | - Yimin Wang
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Nanjing Medical University, Nanjing, 210002, China
| | - Jiaxin Liu
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Qinpei Cheng
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Xueying Zuo
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Liwen Hu
- Department of Cardiothoracic Surgery, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Mingxiang Ye
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China
| | - Hongbing Liu
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China.
| | - Yong Song
- Department of Respiratory and Critical Care Medicine, Affiliated Jinling Hospital, Medical School of Nanjing University, Nanjing, 210002, China.
| |
Collapse
|
3
|
Nobe M, Maruzuru Y, Takeshima K, Koyanagi N, Kato A, Kawaguchi Y. MYBBP1A is required for efficient replication and gene expression of herpes simplex virus 1. Microbiol Immunol 2024; 68:148-154. [PMID: 38402407 DOI: 10.1111/1348-0421.13120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 01/29/2024] [Accepted: 02/07/2024] [Indexed: 02/26/2024]
Abstract
More than 100 different herpes simplex virus 1 (HSV-1) genes belong to three major classes, and their expression is coordinately regulated and sequentially ordered in a cascade. This complex HSV-1 gene expression is thought to be regulated by various viral and host cellular proteins. A host cellular protein, Myb-binding protein 1A (MYBBP1A), has been reported to be associated with HSV-1 viral genomes in conjunction with viral and cellular proteins critical for DNA replication, repair, and transcription within infected cells. However, the role(s) of MYBBP1A in HSV-1 infections remains unclear. In this study, we examined the effects of MYBBP1A depletion on HSV-1 infection and found that MYBBP1A depletion significantly reduced HSV-1 replication, as well as the accumulation of several viral proteins. These results suggest that MYBBP1A is an important host cellular factor that contributes to HSV-1 replication, plausibly by promoting viral gene expression.
Collapse
Affiliation(s)
- Moeka Nobe
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Yuhei Maruzuru
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Infectious Disease Control, International Research Center for Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Minato-ku, Japan
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kosuke Takeshima
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Infectious Disease Control, International Research Center for Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Minato-ku, Japan
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Naoto Koyanagi
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Infectious Disease Control, International Research Center for Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Minato-ku, Japan
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Akihisa Kato
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Infectious Disease Control, International Research Center for Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Minato-ku, Japan
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Yasushi Kawaguchi
- Department of Microbiology and Immunology, Division of Molecular Virology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Department of Infectious Disease Control, International Research Center for Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Minato-ku, Japan
- Research Center for Asian Infectious Diseases, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
- Pandemic Preparedness, Infection and Advanced Research Center, The University of Tokyo, Tokyo, Japan
| |
Collapse
|
4
|
Eldeeb M, Yuan O, Guzzi N, Thi Ngoc PC, Konturek-Ciesla A, Kristiansen TA, Muthukumar S, Magee J, Bellodi C, Yuan J, Bryder D. A fetal tumor suppressor axis abrogates MLL-fusion-driven acute myeloid leukemia. Cell Rep 2023; 42:112099. [PMID: 36763502 DOI: 10.1016/j.celrep.2023.112099] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/16/2022] [Accepted: 01/26/2023] [Indexed: 02/11/2023] Open
Abstract
MLL-rearrangements (MLL-r) are recurrent genetic events in acute myeloid leukemia (AML) and frequently associate with poor prognosis. In infants, MLL-r can be sufficient to drive transformation. However, despite the prenatal origin of MLL-r in these patients, congenital leukemia is very rare with transformation usually occurring postnatally. The influence of prenatal signals on leukemogenesis, such as those mediated by the fetal-specific protein LIN28B, remains controversial. Here, using a dual-transgenic mouse model that co-expresses MLL-ENL and LIN28B, we investigate the impact of LIN28B on AML. LIN28B impedes the progression of MLL-r AML through compromised leukemia-initiating cell activity and suppression of MYB signaling. Mechanistically, LIN28B directly binds to MYBBP1A mRNA, resulting in elevated protein levels of this MYB co-repressor. Functionally, overexpression of MYBBP1A phenocopies the tumor-suppressor effects of LIN28B, while its perturbation omits it. Thereby, we propose that developmentally restricted expression of LIN28B provides a layer of protection against MYB-dependent AML.
Collapse
Affiliation(s)
- Mohamed Eldeeb
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Ouyang Yuan
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Nicola Guzzi
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Phuong Cao Thi Ngoc
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Anna Konturek-Ciesla
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Trine A Kristiansen
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Sowndarya Muthukumar
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Jeffrey Magee
- Division of Hematology and Oncology, Department of Pediatrics, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA
| | - Cristian Bellodi
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - Joan Yuan
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden
| | - David Bryder
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund Stem Cell Center, Faculty of Medical, Lund University, 221 84 Lund, Sweden.
| |
Collapse
|
5
|
Abaji R, Roux V, Yssaad IR, Kalegari P, Gagné V, Gioia R, Ferbeyre G, Beauséjour C, Krajinovic M. Characterization of the impact of the MYBBP1A gene and rs3809849 on asparaginase sensitivity and cellular functions. Pharmacogenomics 2022; 23:415-430. [PMID: 35485735 DOI: 10.2217/pgs-2022-0010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aims: To investigate the role of MYBBP1A gene and rs3809849 in pancreatic cancer (PANC1) and lymphoblastic leukemia (NALM6) cell lines and their response to asparaginase treatment. Materials & methods: The authors applied CRISPR-Cas9 to produce MYBBP1A knock-out (KO) and rs3809849 knock-in (KI) cell lines. The authors also interrogated rs3809849's impact on PANC1 cells through allele-specific overexpression. Results: PANC1 MYBBP1A KO cells exhibited lower proliferation capacity (p ≤ 0.05), higher asparaginase sensitivity (p = 0.01), reduced colony-forming potential (p = 0.001), cell cycle blockage in S phase, induction of apoptosis and remarkable morphology changes suggestive of an epithelial-mesenchymal transition. Overexpression of the wild-type (but not the mutant) allele of MYBBP1A-rs3809849 in PANC1 cells increased asparaginase sensitivity. NALM6 MYBBP1A KO displayed resistance to asparaginase (p < 0.0001), whereas no effect for rs3809849 KI was noted. Conclusions:MYBBP1A is important for regulating various cellular functions, and it plays, along with its rs3809849 polymorphism, a tissue-specific role in asparaginase treatment response.
Collapse
Affiliation(s)
- Rachid Abaji
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
- Department of Pharmacology & Physiology, University of Montreal, Montreal, QC, H3T 1J4, Canada
| | - Vincent Roux
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
| | - Ismahène Reguieg Yssaad
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
- Department of Pharmacology & Physiology, University of Montreal, Montreal, QC, H3T 1J4, Canada
| | - Paloma Kalegari
- Department of Biochemistry & Molecular Medicine, University of Montreal, Montreal, QC, H3T 1J4, Canada
- University of Montreal Hospital Research Centre (CRCHUM), University of Montreal, Montreal, QC, H2X 0A9, Canada
| | - Vincent Gagné
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
| | - Romain Gioia
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
| | - Gerardo Ferbeyre
- Department of Biochemistry & Molecular Medicine, University of Montreal, Montreal, QC, H3T 1J4, Canada
- University of Montreal Hospital Research Centre (CRCHUM), University of Montreal, Montreal, QC, H2X 0A9, Canada
| | - Christian Beauséjour
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
- Department of Pharmacology & Physiology, University of Montreal, Montreal, QC, H3T 1J4, Canada
| | - Maja Krajinovic
- CHU Sainte-Justine Research Center, Montreal, QC, H3T 1C5, Canada
- Department of Pharmacology & Physiology, University of Montreal, Montreal, QC, H3T 1J4, Canada
- Department of Pediatrics, University of Montreal, Montreal, QC, H3T 1C5, Canada
| |
Collapse
|
6
|
Sharif SB, Zamani N, Chadwick BP. BAZ1B the Protean Protein. Genes (Basel) 2021; 12:genes12101541. [PMID: 34680936 PMCID: PMC8536118 DOI: 10.3390/genes12101541] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 02/02/2023] Open
Abstract
The bromodomain adjacent to the zinc finger domain 1B (BAZ1B) or Williams syndrome transcription factor (WSTF) are just two of the names referring the same protein that is encoded by the WBSCR9 gene and is among the 26-28 genes that are lost from one copy of 7q11.23 in Williams syndrome (WS: OMIM 194050). Patients afflicted by this contiguous gene deletion disorder present with a range of symptoms including cardiovascular complications, developmental defects as well as a characteristic cognitive and behavioral profile. Studies in patients with atypical deletions and mouse models support BAZ1B hemizygosity as a contributing factor to some of the phenotypes. Focused analysis on BAZ1B has revealed this to be a versatile nuclear protein with a central role in chromatin remodeling through two distinct complexes as well as being involved in the replication and repair of DNA, transcriptional processes involving RNA Polymerases I, II, and III as well as possessing kinase activity. Here, we provide a comprehensive review to summarize the many aspects of BAZ1B function including its recent link to cancer.
Collapse
Affiliation(s)
- Shahin Behrouz Sharif
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA;
| | - Nina Zamani
- Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA;
| | - Brian P. Chadwick
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA;
- Correspondence:
| |
Collapse
|
7
|
The Tumor Suppressor Roles of MYBBP1A, a Major Contributor to Metabolism Plasticity and Stemness. Cancers (Basel) 2020; 12:cancers12010254. [PMID: 31968688 PMCID: PMC7017249 DOI: 10.3390/cancers12010254] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 12/18/2019] [Accepted: 01/14/2020] [Indexed: 12/12/2022] Open
Abstract
The MYB binding protein 1A (MYBBP1A, also known as p160) acts as a co-repressor of multiple transcription factors involved in many physiological processes. Therefore, MYBBP1A acts as a tumor suppressor in multiple aspects related to cell physiology, most of them very relevant for tumorigenesis. We explored the different roles of MYBBP1A in different aspects of cancer, such as mitosis, cellular senescence, epigenetic regulation, cell cycle, metabolism plasticity and stemness. We especially reviewed the relationships between MYBBP1A, the inhibitory role it plays by binding and inactivating c-MYB and its regulation of PGC-1α, leading to an increase in the stemness and the tumor stem cell population. In addition, MYBBP1A causes the activation of PGC-1α directly and indirectly through c-MYB, inducing the metabolic change from glycolysis to oxidative phosphorylation (OXPHOS). Therefore, the combination of these two effects caused by the decreased expression of MYBBP1A provides a selective advantage to tumor cells. Interestingly, this only occurs in cells lacking pVHL. Finally, the loss of MYBBP1A occurs in 8%–9% of renal tumors. tumors, and this subpopulation could be studied as a possible target of therapies using inhibitors of mitochondrial respiration.
Collapse
|
8
|
Ramos-Sáenz A, González-Álvarez D, Rodríguez-Galán O, Rodríguez-Gil A, Gaspar SG, Villalobo E, Dosil M, de la Cruz J. Pol5 is an essential ribosome biogenesis factor required for 60S ribosomal subunit maturation in Saccharomyces cerevisiae. RNA (NEW YORK, N.Y.) 2019; 25:1561-1575. [PMID: 31413149 PMCID: PMC6795146 DOI: 10.1261/rna.072116.119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 08/08/2019] [Indexed: 06/10/2023]
Abstract
In Saccharomyces cerevisiae, more than 250 trans-acting factors are involved in the maturation of 40S and 60S ribosomal subunits. The expression of most of these factors is transcriptionally coregulated to ensure correct ribosome production under a wide variety of environmental and intracellular conditions. Here, we identified the essential nucleolar Pol5 protein as a novel trans-acting factor required for the synthesis of 60S ribosomal subunits. Pol5 weakly and/or transiently associates with early to medium pre-60S ribosomal particles. Depletion of and temperature-sensitive mutations in Pol5 result in a deficiency of 60S ribosomal subunits and accumulation of half-mer polysomes. Both processing of 27SB pre-rRNA to mature 25S rRNA and release of pre-60S ribosomal particles from the nucle(ol)us to the cytoplasm are impaired in the Pol5-depleted strain. Moreover, we identified the genes encoding ribosomal proteins uL23 and eL27A as multicopy suppressors of the slow growth of a temperature-sensitive pol5 mutant. These results suggest that Pol5 could function in ensuring the correct folding of 25S rRNA domain III; thus, favoring the correct assembly of these two ribosomal proteins at their respective binding sites into medium pre-60S ribosomal particles. Pol5 is homologous to the human tumor suppressor Myb-binding protein 1A (MYBBP1A). However, expression of MYBBP1A failed to complement the lethal phenotype of a pol5 null mutant strain though interfered with 60S ribosomal subunit biogenesis.
Collapse
Affiliation(s)
- Ana Ramos-Sáenz
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, E-41012, Seville, Spain
| | - Daniel González-Álvarez
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, E-41012, Seville, Spain
| | - Olga Rodríguez-Galán
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, E-41012, Seville, Spain
| | - Alfonso Rodríguez-Gil
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
| | - Sonia G Gaspar
- Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, CSIC-Universidad de Salamanca, E-37007, Salamanca, Spain
- Centro de Investigación Biomédica en Red en Cáncer (CIBERONC), CSIC-Universidad de Salamanca, E-37007, Salamanca, Spain
| | - Eduardo Villalobo
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
- Departamento de Microbiología, Facultad de Biología, Universidad de Sevilla, E-41012, Seville, Spain
| | - Mercedes Dosil
- Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, CSIC-Universidad de Salamanca, E-37007, Salamanca, Spain
- Centro de Investigación Biomédica en Red en Cáncer (CIBERONC), CSIC-Universidad de Salamanca, E-37007, Salamanca, Spain
- Departamento de Bioquímica y Biología Molecular, Universidad de Salamanca, E-37007, Salamanca, Spain
| | - Jesús de la Cruz
- Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, E-41013, Seville, Spain
- Departamento de Genética, Facultad de Biología, Universidad de Sevilla, E-41012, Seville, Spain
| |
Collapse
|
9
|
Felipe-Abrio B, Verdugo-Sivianes EM, Carnero A. c-MYB- and PGC1a-dependent metabolic switch induced by MYBBP1A loss in renal cancer. Mol Oncol 2019; 13:1519-1533. [PMID: 31066170 PMCID: PMC6599841 DOI: 10.1002/1878-0261.12499] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 04/24/2019] [Accepted: 05/07/2019] [Indexed: 12/22/2022] Open
Abstract
The tumor microenvironment may alter the original tumorigenic potential of tumor cells. Under harsh environmental conditions, genetic alterations conferring selective advantages may initiate the growth of tumor subclones, providing new opportunities for these tumors to grow. We performed a genetic loss-of-function screen to identify genetic alterations able to promote tumor cell growth in the absence of glucose. We identified that downregulation of MYBBP1A increases tumorigenic properties under nonpermissive conditions. MYBBP1A downregulation simultaneously activates PGC1α, directly by alleviating direct repression and indirectly by increasing PGC1α mRNA levels through c-MYB, leading to a metabolic switch from glycolysis to OXPHOS and increased tumorigenesis in low-glucose microenvironments. We have also identified reduced MYBBP1A expression in human renal tumor samples, which show high expression levels of genes involved in oxidative metabolism. In summary, our data support the role of MYBBP1A as a tumor suppressor by regulating c-MYB and PGC1α. Therefore, loss of MYBBP1A increases adaptability spanning of tumors through metabolic switch.
Collapse
Affiliation(s)
- Blanca Felipe-Abrio
- Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío (HUVR), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, Spain.,CIBER de Cáncer, Instituto de Salud Carlos III, Madrid, Spain
| | - Eva M Verdugo-Sivianes
- Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío (HUVR), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, Spain.,CIBER de Cáncer, Instituto de Salud Carlos III, Madrid, Spain
| | - Amancio Carnero
- Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío (HUVR), Consejo Superior de Investigaciones Científicas, Universidad de Sevilla, Spain.,CIBER de Cáncer, Instituto de Salud Carlos III, Madrid, Spain
| |
Collapse
|
10
|
Weng X, Wu J, Lv Z, Peng C, Chen J, Zhang C, He B, Tong R, Hu W, Ding C, Cao L, Chen D, Wu J, Zheng S. Targeting Mybbp1a suppresses HCC progression via inhibiting IGF1/AKT pathway by CpG islands hypo-methylation dependent promotion of IGFBP5. EBioMedicine 2019; 44:225-236. [PMID: 31109829 PMCID: PMC6606930 DOI: 10.1016/j.ebiom.2019.05.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 05/10/2019] [Accepted: 05/10/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Myb-binding protein 1A (Mybbp1a) is a nucleolar protein that can regulate rRNA metabolism, the stress response and carcinogenesis. However, the function of Mybbp1a in the progression of hepatocellular carcinoma (HCC) is unclear. We aimed to determine the role of Mybbp1a in HCC and the underlying mechanism. METHODS We investigated the function of Mybbp1a in HCC cell models and the xenograft mouse model. The relationship between Mybbp1a and IGFBP5 was found through expression profile chip. The molecular mechanism of Mybbp1a regulating IGFBP5 was proved through CO-IP, CHIP, Bisulfite Sequencing and Pyrosequencing. FINDINGS In this study, we observed that Mybbp1a was overexpressed in HCC tissues and associated with the poor prognosis of HCC patients. Suppression of Mybbp1a led to a reduction in the proliferation and migration ability of HCC cells through inhibiting the IGF1/AKT signaling pathway. Further study found that Mybbp1a could form a complex with DNMT1 and induce aberrant hyper-methylation of CpG islands of IGFBP5, which inhibits secretion of IGFBP5 and then activates IGF1/AKT signaling pathway. INTERPRETATION These findings extend our understanding of the function of Mybbp1a in the progression of HCC. The newly identified Mybbp1a may provide a novel biomarker for developing potential therapeutic targets of HCC. FUND: Science Technology Department of Zhejiang Province (No. 2015C03034), National Health and Family Planning Commission of China (No. 2016138643), Innovative Research Groups of National Natural Science Foundation of China (No. 81721091), Major program of National Natural Science Foundation of China (No. 91542205).
Collapse
Affiliation(s)
- Xiaoyu Weng
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Jingbang Wu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Zhen Lv
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Chuanhui Peng
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Junru Chen
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Cheng Zhang
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Bin He
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Rongliang Tong
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Wendi Hu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Chaofeng Ding
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Linping Cao
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Diyu Chen
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China
| | - Jian Wu
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China; The Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou 310003, China.
| | - Shusen Zheng
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China; Key Lab of Combined Multi-Organ Transplantation, Ministry of Public Health, Hangzhou 310003, China; The Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Zhejiang University, Hangzhou 310003, China.
| |
Collapse
|
11
|
Loss of MYBBP1A Induces Cancer Stem Cell Activity in Renal Cancer. Cancers (Basel) 2019; 11:cancers11020235. [PMID: 30781655 PMCID: PMC6406377 DOI: 10.3390/cancers11020235] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/03/2019] [Accepted: 02/13/2019] [Indexed: 01/20/2023] Open
Abstract
Tumors are cellular ecosystems where different populations and subpopulations of cells coexist. Among these cells, cancer stem cells (CSCs) are considered to be the origin of the tumor mass, being involved in metastasis and in the resistance to conventional therapies. Furthermore, tumor cells have an enormous plasticity and a phenomenon of de-differentiation of mature tumor cells to CSCs may occur. Therefore, it is essential to identify genetic alterations that cause the de-differentiation of mature tumor cells to CSCs for the future design of therapeutic strategies. In this study, we characterized the role of MYBBP1A by experiments in cell lines, xenografts and human tumor samples. We have found that MYBBP1A downregulation increases c-MYB (Avian myeloblastosis viral oncogene homolog) activity, leading to a rise in the stem-like cell population. We identified that the downregulation of MYBBP1A increases tumorigenic properties, in vitro and in vivo, in renal carcinoma cell lines that express high levels of c-MYB exclusively. Moreover, in a cohort of renal tumors, MYBBP1A is downregulated or lost in a significant percentage of tumors correlating with poor patient prognosis and a metastatic tendency. Our data support the role of MYBBP1A as a tumor suppressor by repressing c-MYB, acting as an important regulator of the plasticity of tumor cells.
Collapse
|
12
|
Lorenzo V, Mascanzoni F, Vitagliano L, Ruvo M, Doti N. The Interacting Domains of PREP1 and p160 are Endowed with a Remarkable Structural Stability. Mol Biotechnol 2016; 58:328-39. [DOI: 10.1007/s12033-016-9932-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
13
|
Interaction of c-Myb with p300 is required for the induction of acute myeloid leukemia (AML) by human AML oncogenes. Blood 2014; 123:2682-90. [DOI: 10.1182/blood-2012-02-413187] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Key Points
A mutation preventing interaction between c-Myb and p300 prevents transformation and leukemia induction by MLL-AF9 and AML1-ETO9a oncogenes. Identifying agents that block the c-Myb-p300 interaction may be a valuable approach to developing a therapy for acute myeloid leukemia.
Collapse
|
14
|
Karim MF, Yoshizawa T, Sato Y, Sawa T, Tomizawa K, Akaike T, Yamagata K. Inhibition of H3K18 deacetylation of Sirt7 by Myb-binding protein 1a (Mybbp1a). Biochem Biophys Res Commun 2013; 441:157-63. [DOI: 10.1016/j.bbrc.2013.10.020] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 10/07/2013] [Indexed: 11/29/2022]
|
15
|
Mori S, Bernardi R, Laurent A, Resnati M, Crippa A, Gabrieli A, Keough R, Gonda TJ, Blasi F. Myb-binding protein 1A (MYBBP1A) is essential for early embryonic development, controls cell cycle and mitosis, and acts as a tumor suppressor. PLoS One 2012; 7:e39723. [PMID: 23056166 PMCID: PMC3466261 DOI: 10.1371/journal.pone.0039723] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 05/25/2012] [Indexed: 11/24/2022] Open
Abstract
MYBBP1A is a predominantly nucleolar transcriptional regulator involved in rDNA synthesis and p53 activation via acetylation. However little further information is available as to its function. Here we report that MYBBP1A is developmentally essential in the mouse prior to blastocyst formation. In cell culture, down-regulation of MYBBP1A decreases the growth rate of wild type mouse embryonic stem cells, mouse embryo fibroblasts (MEFs) and of human HeLa cells, where it also promotes apoptosis. HeLa cells either arrest at G2/M or undergo delayed and anomalous mitosis. At mitosis, MYBBP1A is localized to a parachromosomal region and gene-expression profiling shows that its down-regulation affects genes controlling chromosomal segregation and cell cycle. However, MYBBP1A down-regulation increases the growth rate of the immortalized NIH3T3 cells. Such Mybbp1a down-regulated NIH3T3 cells are more susceptible to Ras-induced transformation and cause more potent Ras-driven tumors. We conclude that MYBBP1A is an essential gene with novel roles at the pre-mitotic level and potential tumor suppressor activity.
Collapse
Affiliation(s)
- Silvia Mori
- Università Vita Salute San Raffaele, Milan, Italy
| | - Rosa Bernardi
- Università Vita Salute San Raffaele, Milan, Italy
- San Raffaele Scientific Institute, Milan, Italy
| | - Audrey Laurent
- Fondazione Istituto FIRC di Oncologia Molecolare (IFOM), Milano, Italy
| | | | | | - Arianna Gabrieli
- Fondazione Istituto FIRC di Oncologia Molecolare (IFOM), Milano, Italy
| | - Rebecca Keough
- Flinders University, Bedford Park, Adelaide, South Australia, Australia
- Division of Human Immunology and Hanson Institute, Institute of Medical and Veterinary Science, Adelaide, South Australia, Australia
| | - Thomas J. Gonda
- University of Queensland Diamantina Institute, Brisbane, Queensland, Australia
- Division of Human Immunology and Hanson Institute, Institute of Medical and Veterinary Science, Adelaide, South Australia, Australia
| | - Francesco Blasi
- Università Vita Salute San Raffaele, Milan, Italy
- Fondazione Istituto FIRC di Oncologia Molecolare (IFOM), Milano, Italy
- * E-mail:
| |
Collapse
|
16
|
|
17
|
Tan BCM, Yang CC, Hsieh CL, Chou YH, Zhong CZ, Yung BYM, Liu H. Epigeneitc silencing of ribosomal RNA genes by Mybbp1a. J Biomed Sci 2012; 19:57. [PMID: 22686419 PMCID: PMC3407492 DOI: 10.1186/1423-0127-19-57] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Accepted: 06/11/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Transcription of the ribosomal RNA gene repeats by Pol I occurs in the nucleolus and is a fundamental step in ribosome biogenesis and protein translation. Due to tight coordination between ribosome biogenesis and cell proliferation, transcription of rRNA and stable maintenance of rDNA clusters are thought to be under intricate control by intercalated mechanisms, particularly at the epigenetic level. METHODS AND RESULTS Here we identify the nucleolar protein Myb-binding protein 1a (Mybbp1a) as a novel negative regulator of rRNA expression. Suppression of rDNA transcription by Mybbp1a was linked to promoter regulation as illustrated by its binding to the chromatin around the hypermethylated, inactive rDNA gene promoters. Our data further showed that downregulation of Mybbp1a abrogated the local DNA methylation levels and histone marks associated with gene silencing, and altered the promoter occupancy of various factors such UBF and HDACs, consequently leading to elevated rRNA expression. Mechanistically, we propose that Mybbp1a maintains rDNA repeats in a silenced state while in association with the negative epigenetic modifiers HDAC1/2. CONCLUSIONS Results from our present work reveal a previously unrecognized co-repressor role of Mybbp1a in rRNA expression. They are further consistent with the scenario that Mybbp1a is an integral constituent of the rDNA epigenetic regulation that underlies the balanced state of rDNA clusters.
Collapse
Affiliation(s)
- Bertrand Chin-Ming Tan
- Graduate Institute of Biomedical Sciences and Department of Biomedical Sciences, College of Medicine, Chang Gung University, Kwei-San, Tao-Yuan 333, Taiwan
| | | | | | | | | | | | | |
Collapse
|
18
|
Hochstatter J, Hölzel M, Rohrmoser M, Schermelleh L, Leonhardt H, Keough R, Gonda TJ, Imhof A, Eick D, Längst G, Németh A. Myb-binding protein 1a (Mybbp1a) regulates levels and processing of pre-ribosomal RNA. J Biol Chem 2012; 287:24365-77. [PMID: 22645127 DOI: 10.1074/jbc.m111.303719] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Ribosomal RNA gene transcription, co-transcriptional processing, and ribosome biogenesis are highly coordinated processes that are tightly regulated during cell growth. In this study we discovered that Mybbp1a is associated with both the RNA polymerase I complex and the ribosome biogenesis machinery. Using a reporter assay that uncouples transcription and RNA processing, we show that Mybbp1a represses rRNA gene transcription. In addition, overexpression of the protein reduces RNA polymerase I loading on endogenous rRNA genes as revealed by chromatin immunoprecipitation experiments. Accordingly, depletion of Mybbp1a results in an accumulation of the rRNA precursor in vivo but surprisingly also causes growth arrest of the cells. This effect can be explained by the observation that the modulation of Mybbp1a protein levels results in defects in pre-rRNA processing within the cell. Therefore, the protein may play a dual role in the rRNA metabolism, potentially linking and coordinating ribosomal DNA transcription and pre-rRNA processing to allow for the efficient synthesis of ribosomes.
Collapse
Affiliation(s)
- Julia Hochstatter
- Biochemistry Center Regensburg, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Zhang Q, Yang H. The Roles of VHL-Dependent Ubiquitination in Signaling and Cancer. Front Oncol 2012; 2:35. [PMID: 22649785 PMCID: PMC3355907 DOI: 10.3389/fonc.2012.00035] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Accepted: 03/26/2012] [Indexed: 01/07/2023] Open
Abstract
The function of tumor suppressor VHL is compromised in the vast majority of clear cell renal cell carcinoma, and its mutations or loss of expression was causal for this disease. pVHL was found to be a substrate recognition subunit of an E3 ubiquitin ligase, and most of the tumor-derived mutations disrupt this function. pVHL was found to bind to the alpha subunits of hypoxia-inducible factor (HIF) and promote their ubiquitination and proteasomal degradation. Proline hydroxylation on key sites of HIFα provides the binding signal for pVHL E3 ligase complex. Beside HIFα, several other VHL targets have been identified, including activated epidermal growth factor receptor (EGFR), RNA polymerase II subunits RPB1 and hsRPB7, atypical protein kinase C (PKC), Sprouty2, β-adrenergic receptor II, and Myb-binding protein p160. HIFα is the most well studied substrate and has been proven to be critical for pVHL's tumor suppressor function, but the activated EGFR and PKC and other pVHL substrates might also be important for tumor growth and drug response. Their regulations by pVHL and their relevance to signaling and cancer are discussed.
Collapse
Affiliation(s)
- Qing Zhang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School Boston, MA, USA
| | | |
Collapse
|
20
|
Acuña Sanhueza GA, Faller L, George B, Koffler J, Misetic V, Flechtenmacher C, Dyckhoff G, Plinkert PP, Angel P, Simon C, Hess J. Opposing function of MYBBP1A in proliferation and migration of head and neck squamous cell carcinoma cells. BMC Cancer 2012; 12:72. [PMID: 22339894 PMCID: PMC3342895 DOI: 10.1186/1471-2407-12-72] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Accepted: 02/17/2012] [Indexed: 11/10/2022] Open
Abstract
Background Head and neck squamous cell carcinoma (HNSCC) is one of the most prevalent and lethal cancers worldwide and mortality mostly results from loco-regional recurrence and metastasis. Despite its significance, our knowledge on molecular, cellular and environmental mechanisms that drive disease pathogenesis remains largely elusive, and there are limited therapeutic options, with only negligible clinical benefit. Methods We applied global gene expression profiling with samples derived from a recently established mouse model for oral cancer recurrence and identified a list of genes with differential expression between primary and recurrent tumors. Results One differentially expressed gene codes for Myb-binding protein 1a (MYBBP1A), which is known as a transcriptional co-regulator that physically interacts with nuclear transcription factors, such as NFκB and p53. We confirmed significantly reduced MYBBP1A protein levels on tissue sections of recurrent mouse tumors compared to primary tumors by immunohistochemistry, and found aberrant MYBBP1A protein levels also in tumor samples of HNSCC patients. Interestingly, silencing of MYBBP1A expression in murine SCC7 and in human HNSCC cell lines elicited increased migration but decreased cell growth. Conclusion We provide experimental evidence that MYBBP1A is an important molecular switch in the regulation of tumor cell proliferation versus migration in HNSCC and it will be a major challenge for the future to proof the concept whether regulation MYBBP1A expression and/or function could serve as a novel option for anti-cancer therapy.
Collapse
Affiliation(s)
- Gustavo A Acuña Sanhueza
- Department of Otolaryngology, Head and Neck Surgery, University Hospital Heidelberg, Heidelberg, Germany
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Yang CC, Liu H, Chen SL, Wang TH, Hsieh CL, Huang Y, Chen SJ, Chen HC, Yung BYM, Chin-Ming Tan B. Epigenetic silencing of myogenic gene program by Myb-binding protein 1a suppresses myogenesis. EMBO J 2012; 31:1739-51. [PMID: 22333916 DOI: 10.1038/emboj.2012.24] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Accepted: 01/23/2012] [Indexed: 01/25/2023] Open
Abstract
Skeletal myogenesis involves highly coordinated steps that integrate developmental cues at the chromatin of muscle progenitors. Here, we identify Myb-binding protein 1a (Mybbp1a) as a novel negative regulator of muscle-specific gene expression and myoblast differentiation. The mode of action of Mybbp1a was linked to promoter regulation as illustrated by its interaction with MyoD at the genomic regions of silent muscle-specific genes as well as its negative effect on MyoD-mediated transcriptional activity. We propose that Mybbp1a exerts its repressive role by inducing a less permissible chromatin structure following recruitment of negative epigenetic modifiers such as HDAC1/2 and Suv39h1. At the onset of differentiation, Mybbp1a undergoes a promoter disengagement that may be due to the differentiation-responsive, miR-546-mediated downregulation of Mybbp1a expression. Moreover, such alteration gave rise to promoter enrichment of activators and histone acetylation, an epigenetic status amenable to gene activation. Together, these findings unveil a hitherto unrecognized transcriptional co-repressor role of Mybbp1a in proliferating muscle progenitor cells, and highlight an epigenetic mechanism by which Mybbp1a and miR-546 interplay to control myoblast differentiation transition.
Collapse
Affiliation(s)
- Chang-Ching Yang
- Graduate Institute of Biomedical Sciences, College of Medicine, Chang Gung University, Kwei-San, Tao-Yuan, Taiwan, ROC
| | | | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Zhao J, Yu H, Lin L, Tu J, Cai L, Chen Y, Zhong F, Lin C, He F, Yang P. Interactome study suggests multiple cellular functions of hepatoma-derived growth factor (HDGF). J Proteomics 2011; 75:588-602. [DOI: 10.1016/j.jprot.2011.08.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2011] [Revised: 08/14/2011] [Accepted: 08/25/2011] [Indexed: 02/05/2023]
|
23
|
Lai Y, Qiao M, Song M, Weintraub ST, Shiio Y. Quantitative proteomics identifies the Myb-binding protein p160 as a novel target of the von Hippel-Lindau tumor suppressor. PLoS One 2011; 6:e16975. [PMID: 21386990 PMCID: PMC3046137 DOI: 10.1371/journal.pone.0016975] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Accepted: 01/11/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The von Hippel-Lindau (VHL) tumor suppressor gene encodes a component of a ubiquitin ligase complex, which is best understood as a negative regulator of hypoxia inducible factor (HIF). VHL ubiquitinates and degrades the α subunits of HIF, and this is proposed to suppress tumorigenesis and tumor angiogenesis. However, several lines of evidence suggest that there are unidentified substrates or targets for VHL that play important roles in tumor suppression. METHODOLOGY/PRINCIPAL FINDINGS Employing quantitative proteomics, we developed an approach to systematically identify the substrates of ubiquitin ligases and using this method, we identified the Myb-binding protein p160 as a novel substrate of VHL. CONCLUSIONS/SIGNIFICANCE A major barrier to understanding the functions of ubiquitin ligases has been the difficulty in pinpointing their ubiquitination substrates. The quantitative proteomics approach we devised for the identification of VHL substrates will be widely applicable to other ubiquitin ligases.
Collapse
Affiliation(s)
- Yanlai Lai
- Greehey Children's Cancer Research Institute, San Antonio, Texas, United States of America
| | - Mei Qiao
- Greehey Children's Cancer Research Institute, San Antonio, Texas, United States of America
| | - Meihua Song
- Greehey Children's Cancer Research Institute, San Antonio, Texas, United States of America
| | - Susan T. Weintraub
- Department of Biochemistry, The University of Texas Health Science Center, San Antonio, Texas, United States of America
| | - Yuzuru Shiio
- Greehey Children's Cancer Research Institute, San Antonio, Texas, United States of America
- Department of Biochemistry, The University of Texas Health Science Center, San Antonio, Texas, United States of America
| |
Collapse
|
24
|
RNA content in the nucleolus alters p53 acetylation via MYBBP1A. EMBO J 2011; 30:1054-66. [PMID: 21297583 DOI: 10.1038/emboj.2011.23] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Accepted: 01/11/2011] [Indexed: 12/23/2022] Open
Abstract
A number of external and internal insults disrupt nucleolar structure, and the resulting nucleolar stress stabilizes and activates p53. We show here that nucleolar disruption induces acetylation and accumulation of p53 without phosphorylation. We identified three nucleolar proteins, MYBBP1A, RPL5, and RPL11, involved in p53 acetylation and accumulation. MYBBP1A was tethered to the nucleolus through nucleolar RNA. When rRNA transcription was suppressed by nucleolar stress, MYBBP1A translocated to the nucleoplasm and facilitated p53-p300 interaction to enhance p53 acetylation. We also found that RPL5 and RPL11 were required for rRNA export from the nucleolus. Depletion of RPL5 or RPL11 blocked rRNA export and counteracted reduction of nucleolar RNA levels caused by inhibition of rRNA transcription. As a result, RPL5 or RPL11 depletion inhibited MYBBP1A translocation and p53 activation. Our observations indicated that a dynamic equilibrium between RNA generation and export regulated nucleolar RNA content. Perturbation of this balance by nucleolar stress altered the nucleolar RNA content and modulated p53 activity.
Collapse
|
25
|
Cai L, Pan H, Trzciński K, Thompson CM, Wu Q, Kramnik I. MYBBP1A: a new Ipr1's binding protein in mice. Mol Biol Rep 2010; 37:3863-8. [PMID: 20221700 PMCID: PMC3084015 DOI: 10.1007/s11033-010-0042-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2009] [Accepted: 02/24/2010] [Indexed: 12/16/2022]
Abstract
Infection with mycobacterium tuberculosis (MTB) can cause different outcomes in hosts with variant genetic backgrounds. Previously, we identified an intracellular pathogen resistance 1 (Ipr1) gene with the role of resistance of MTB infection in mice model. However, until now, its binding proteins have been little known even for its human homology, SP110. In this study, the homology for mouse Ipr1 in canines was found to have an extra domain structure, h.1.5.1. And 30 potential candidate proteins were predicted to bind canine Ipr1, which were characterized of the interacting structure with the h.1.5.1. Among them, MYBBP1A was verified to bind with both Ipr1 and eGFP-Ipr1 in mouse macrophage J774A.1 clone 21 cells using co-immunoprecipitation method. And with the constructed high-confidence Ipr1-involved network, we suggested that Ipr1 might be involved in apoptosis pathway via MYBBP1A.
Collapse
Affiliation(s)
- Lei Cai
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, 667 Huntington Avenue, Boston, MA 02115, USA.
| | | | | | | | | | | |
Collapse
|
26
|
Perrera C, Colombo R, Valsasina B, Carpinelli P, Troiani S, Modugno M, Gianellini L, Cappella P, Isacchi A, Moll J, Rusconi L. Identification of Myb-binding protein 1A (MYBBP1A) as a novel substrate for aurora B kinase. J Biol Chem 2010; 285:11775-85. [PMID: 20177074 DOI: 10.1074/jbc.m109.068312] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Aurora kinases are mitotic enzymes involved in centrosome maturation and separation, spindle assembly and stability, and chromosome condensation, segregation, and cytokinesis and represent well known targets for cancer therapy because their deregulation has been linked to tumorigenesis. The availability of suitable markers is of crucial importance to investigate the functions of Auroras and monitor kinase inhibition in in vivo models and in clinical trials. Extending the knowledge on Aurora substrates could help to better understand their biology and could be a source for clinical biomarkers. Using biochemical, mass spectrometric, and cellular approaches, we identified MYBBP1A as a novel Aurora B substrate and serine 1303 as the major phosphorylation site. MYBBP1A is phosphorylated in nocodazole-arrested cells and is dephosphorylated upon Aurora B silencing or by treatment with Danusertib, a small molecule inhibitor of Aurora kinases. Furthermore, we show that MYBBP1A depletion by RNA interference causes mitotic progression delay and spindle assembly defects. MYBBP1A has until now been described as a nucleolar protein, mainly involved in transcriptional regulation. The results presented herein show MYBBP1A as a novel Aurora B kinase substrate and reveal a not yet recognized link of this nucleolar protein to mitosis.
Collapse
|
27
|
Osman AM, Pennings JLA, Blokland M, Peijnenburg A, van Loveren H. Protein expression profiling of mouse thymoma cells upon exposure to the trichothecene deoxynivalenol (DON): Implications for its mechanism of action. J Immunotoxicol 2009; 6:174-83. [DOI: 10.3109/15476910903496691] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
|
28
|
Pattabiraman DR, Sun J, Dowhan DH, Ishii S, Gonda TJ. Mutations in Multiple Domains of c-Myb Disrupt Interaction with CBP/p300 and Abrogate Myeloid Transforming Ability. Mol Cancer Res 2009; 7:1477-86. [DOI: 10.1158/1541-7786.mcr-09-0070] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
29
|
Hara Y, Onishi Y, Oishi K, Miyazaki K, Fukamizu A, Ishida N. Molecular characterization of Mybbp1a as a co-repressor on the Period2 promoter. Nucleic Acids Res 2009; 37:1115-26. [PMID: 19129230 PMCID: PMC2651808 DOI: 10.1093/nar/gkn1013] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The circadian clock comprises transcriptional feedback loops of clock genes. Cryptochromes are essential components of the negative feedback loop in mammals as they inhibit CLOCK-BMAL1-mediated transcription. We purified mouse CRY1 (mCRY1) protein complexes from Sarcoma 180 cells to determine their roles in circadian gene expression and discovered that Myb-binding protein 1a (Mybbp1a) interacts with mCRY1. Mybbp1a regulates various transcription factors, but its role in circadian gene expression is unknown. We found that Mybbp1a functions as a co-repressor of Per2 expression and repressed Per2 promoter activity in reporter assays. Chromatin immunoprecipitation (ChIP) assays revealed endogenous Mybbp1a binding to the Per2 promoter that temporally matched that of mCRY1. Furthermore, Mybbp1a binding to the Per2 promoter correlated with the start of the down-regulation of Per2 expression and with the dimethylation of histone H3 Lys9, to which it could also bind. These findings suggest that Mybbp1a and mCRY1 can form complexes on the Per2 promoter that function as negative regulators of Per2 expression.
Collapse
Affiliation(s)
- Yasuhiro Hara
- Clock Cell Biology, Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | | | | | | | | | | |
Collapse
|
30
|
Prep1 deficiency induces protection from diabetes and increased insulin sensitivity through a p160-mediated mechanism. Mol Cell Biol 2008; 28:5634-45. [PMID: 18644868 DOI: 10.1128/mcb.00117-08] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have examined glucose homeostasis in mice hypomorphic for the homeotic transcription factor gene Prep1. Prep1-hypomorphic (Prep1(i/i)) mice exhibit an absolute reduction in circulating insulin levels but normal glucose tolerance. In addition, these mice exhibit protection from streptozotocin-induced diabetes and enhanced insulin sensitivity with improved glucose uptake and insulin-dependent glucose disposal by skeletal muscle. This muscle phenotype does not depend on reduced expression of the known Prep1 transcription partner, Pbx1. Instead, in Prep1(i/i) muscle, we find normal Pbx1 but reduced levels of the recently identified novel Prep1 interactor p160. Consistent with this reduction, we find a muscle-selective increase in mRNA and protein levels of PGC-1alpha, accompanied by enhanced expression of the GLUT4 transporter, responsible for insulin-stimulated glucose uptake in muscle. Indeed, using L6 skeletal muscle cells, we induced the opposite effects by overexpressing Prep1 or p160, but not Pbx1. In vivo skeletal muscle delivery of p160 cDNA in Prep1(i/i) mice also reverses the molecular phenotype. Finally, we show that Prep1 controls the stability of the p160 protein. We conclude that Prep1 controls insulin sensitivity through the p160-GLUT4 pathway.
Collapse
|
31
|
Yamauchi T, Keough RA, Gonda TJ, Ishii S. Ribosomal stress induces processing of Mybbp1a and its translocation from the nucleolus to the nucleoplasm. Genes Cells 2008; 13:27-39. [PMID: 18173745 DOI: 10.1111/j.1365-2443.2007.01148.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Myb-binding protein 1a (Mybbp1a) was originally identified as a c-myb proto-oncogene product (c-Myb)-interacting protein, and also binds to various other transcription factors. The 160-kDa Mybbp1a protein (p160(MBP)) is ubiquitously expressed and is post-translationally processed in some types of cells to generate an amino-terminal 67 kDa fragment (p67(MBP)). Despite its interaction with various transcription factors, Mybbp1a is localized predominantly, but not exclusively, in nucleoli. Here, we have purified the two Mybbp1a-containing complexes. The smaller complex contained p67(MBP) and p140(MBP), which lacked the C-terminal region of p160(MBP) containing the nucleolar localization sequences. The larger complex contained the intact p160(MBP) and various ribosomal subunits. Treatment of cells with actinomycin D (ActD), cisplatin or UV, all of which inhibit ribosome biogenesis, induced processing of p160(MBP) into p140(MBP) and p67(MBP). ActD, cisplatin and UV also induced a translocation of Mybbp1a from the nucleolus to the nucleoplasm. Both small and large Mybbp1a complexes contained nucleophosmin and nucleolin. In contrast, nucleostemin was detected only in the large complex, while the cell cycle-regulated protein EBP1 was only in the small complex. These results suggest that Mybbp1a may connect the ribosome biogenesis and the Myb-dependent transcription, which controls cell cycle progression and proliferation.
Collapse
Affiliation(s)
- Tomohiro Yamauchi
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan
| | | | | | | |
Collapse
|
32
|
Díaz VM, Bachi A, Blasi F. Purification of the Prep1 interactome identifies novel pathways regulated by Prep1. Proteomics 2007; 7:2617-23. [PMID: 17623278 DOI: 10.1002/pmic.200700197] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Prep1 homeodomain transcription factor interacts with Pbx proteins to regulate oculogenesis, angiogenesis, and hematopoiesis in mice. To isolate new Prep1 interactors competing or copurifying with Pbx, we identified proteins copurified with Prep1-TAP by tandem affinity purification (TAP). Prep1-TAP was fully functional and allowed the isolation of a Prep1 proteome from cytoplasm and nucleus, but most interactors were nuclear. The Prep1-TAP complex included Pbx1b, Pbx2, and other nonhomeodomain proteins: p160 Myb-binding protein (p160), beta-actin, NMMHCIIA.
Collapse
Affiliation(s)
- Víctor M Díaz
- Molecular Genetics Unit, Department of Molecular Biology and Functional Genomics, Università Vita Salute San Raffaele and DIBIT, H San Raffaele, Milan, Italy
| | | | | |
Collapse
|
33
|
Díaz VM, Mori S, Longobardi E, Menendez G, Ferrai C, Keough RA, Bachi A, Blasi F. p160 Myb-binding protein interacts with Prep1 and inhibits its transcriptional activity. Mol Cell Biol 2007; 27:7981-90. [PMID: 17875935 PMCID: PMC2169149 DOI: 10.1128/mcb.01290-07] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Prep1 is known to interact in vivo with Pbx1 to regulate development and organogenesis. We have identified a novel Prep1-interacting protein, p160 c-Myb binding protein (p160). p160 and Pbx1 compete for Prep1 in vitro, and p160 inhibits Prep1-dependent HoxB2 expression in retinoic acid-treated NT2-D1 cells. The N-terminal physiologically truncated form of p160, p67, binds the sequence 63LFPLL67 in the HR1 domain of Prep1. Mutation of both L63 and L66 impairs the binding of Prep1 to both p160/p67 and Pbx1. The sequences required to bind Prep1 are mainly located in residues 51 to 151. Immunofluorescence colocalization and coimmunoprecipitation of endogenous p160 and Prep1 are induced by ActD, which translocates p160 from the nucleolus to the nucleoplasm. These data therefore show that p160 is a novel regulator of Prep1-Pbx1 transcriptional activity.
Collapse
Affiliation(s)
- Víctor M Díaz
- Molecular Genetics Unit, Department of Molecular Biology and Functional Genomics, Università Vita Salute San Raffaele and DIBIT, H San Raffaele, via Olgettina 58, 20132 Milan, Italy
| | | | | | | | | | | | | | | |
Collapse
|
34
|
Prieto JL, McStay B. Recruitment of factors linking transcription and processing of pre-rRNA to NOR chromatin is UBF-dependent and occurs independent of transcription in human cells. Genes Dev 2007; 21:2041-54. [PMID: 17699751 PMCID: PMC1948859 DOI: 10.1101/gad.436707] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Accepted: 07/06/2007] [Indexed: 11/24/2022]
Abstract
Efficient ribosome biogenesis requires coordination of a highly complex series of events. Early events include pre-RNA transcription, processing, and modification. Analysis in yeast has demonstrated that t-UTPs, components of the U3 snoRNA-containing pre-rRNA processing complex, are required for efficient transcription of ribosomal genes (rDNA) by RNA polymerase I (pol I). Here, we characterize human t-UTPs and establish that their ability to link transcription and pre-rRNA processing is evolutionarily conserved. The pol I transcription factor UBF binds extensively across rDNA throughout the cell cycle, resulting in a specialized form of chromatin that is the hallmark of active nucleolar organizer regions (NORs). Transcriptionally silent pseudo-NORs are ectopic, chromosomally integrated, artificial arrays that mimic this specialized chromatin structure. Pseudo-NORs sequester t-UTPs and factors linking transcription with pre-rRNA modification (Nopp140 and Treacle). Recruitment is independent of transcription, the underlying DNA sequence, and location within the nucleolus. Previously, we have demonstrated that pseudo-NORs sequester every component of the pol I transcription machinery. Taken together, these results highlight the importance of the specialized chromatin structure at active NORs in coordinating early events in ribosome biogenesis and nucleolar formation.
Collapse
Affiliation(s)
- José-Luis Prieto
- Biomedical Research Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY Scotland, United Kingdom
| | - Brian McStay
- Biomedical Research Centre, Ninewells Hospital and Medical School, University of Dundee, Dundee, DD1 9SY Scotland, United Kingdom
| |
Collapse
|
35
|
Takezawa S, Yokoyama A, Okada M, Fujiki R, Iriyama A, Yanagi Y, Ito H, Takada I, Kishimoto M, Miyajima A, Takeyama KI, Umesono K, Kitagawa H, Kato S. A cell cycle-dependent co-repressor mediates photoreceptor cell-specific nuclear receptor function. EMBO J 2007; 26:764-74. [PMID: 17255935 PMCID: PMC1794400 DOI: 10.1038/sj.emboj.7601548] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Accepted: 12/15/2006] [Indexed: 01/30/2023] Open
Abstract
Photoreceptor cell-specific nuclear receptor (PNR) (NR2E3) acts as a sequence-specific repressor that controls neuronal differentiation in the developing retina. We identified a novel PNR co-repressor, Ret-CoR, that is expressed in the developing retina and brain. Biochemical purification of Ret-CoR identified a multiprotein complex that included E2F/Myb-associated proteins, histone deacetylases (HDACs) and NCoR/HDAC complex-related components. Ret-CoR appeared to function as a platform protein for the complex, and interacted with PNR via two CoRNR motifs. Purified Ret-CoR complex exhibited HDAC activity, co-repressed PNR transrepression function in vitro, and co-repressed PNR function in PNR target gene promoters, presumably in the retinal progenitor cells. Notably, the appearance of Ret-CoR protein was cell-cycle-stage-dependent (from G1 to S). Therefore, Ret-CoR appears to act as a component of an HDAC co-repressor complex that supports PNR repression function in the developing retina, and may represent a co-regulator class that supports transcriptional regulator function via cell-cycle-dependent expression.
Collapse
Affiliation(s)
- Shinichiro Takezawa
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
- ERATO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| | - Atsushi Yokoyama
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Maiko Okada
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Ryoji Fujiki
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Aya Iriyama
- Department of Ophthalmology, University of Tokyo, School of Medicine, Bunkyo-ku, Tokyo, Japan
| | - Yasuo Yanagi
- Department of Ophthalmology, University of Tokyo, School of Medicine, Bunkyo-ku, Tokyo, Japan
| | - Hiroaki Ito
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Ichiro Takada
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Masahiko Kishimoto
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Atsushi Miyajima
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Ken-ichi Takeyama
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Kazuhiko Umesono
- Institute for Virus Research, and Graduate School for Biostudies, Kyoto University, Kyoto, Japan
| | - Hirochika Kitagawa
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Shigeaki Kato
- The Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
- ERATO, Japan Science and Technology Agency, Kawaguchi, Saitama, Japan
| |
Collapse
|
36
|
Owen HR, Elser M, Cheung E, Gersbach M, Kraus WL, Hottiger MO. MYBBP1a is a Novel Repressor of NF-κB. J Mol Biol 2007; 366:725-36. [PMID: 17196614 DOI: 10.1016/j.jmb.2006.11.099] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2006] [Revised: 11/17/2006] [Accepted: 11/21/2006] [Indexed: 01/22/2023]
Abstract
NF-kappaB is an inducible transcription factor activated in many different cell types by inflammatory and stress signals. The transcription of a wide variety of NF-kappaB genes is regulated by the coordinated action of transcription co-activators and co-repressors. Previously we identified Myb binding protein 1a (MYBBP1a) as an interaction partner of the transcription activation domain of RelA/p65. MYBBP1a has been shown by others to regulate various transcription factors, through largely unknown mechanisms. Here we present evidence that MYBBP1a is a novel co-repressor of NF-kappaB. MYBBP1a interacted directly with RelA/p65 and expression of MYBBP1a in cells repressed NF-kappaB dependent reporter expression but did affect neither RelA/p65 nuclear translocation nor its DNA binding activity. In vitro, MYBBP1a inhibited transcription from chromatinized templates at a step before pre-initiation complex formation. MYBBP1a was found to compete with the histone acetyl transferase co-activator, p300, for interaction with the transcription activation domain of RelA/p65. Expression levels of MYBBP1a are dependent on the cell type, and are particularly high in Jurkat T cells. These results indicate that MYBBP1a is a novel NF-kappaB co-repressor of transcription that competes with p300 and may function to regulate cell type specific genes.
Collapse
Affiliation(s)
- Heather R Owen
- Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | | | | | | | | | | |
Collapse
|
37
|
Sramko M, Markus J, Kabát J, Wolff L, Bies J. Stress-induced inactivation of the c-Myb transcription factor through conjugation of SUMO-2/3 proteins. J Biol Chem 2006; 281:40065-75. [PMID: 17077080 DOI: 10.1074/jbc.m609404200] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Post-translational modifications, such as phosphorylation, acetylation, ubiquitination, and SUMOylation, play an important role in regulation of the stability and the transcriptional activity of c-Myb. Conjugation of small ubiquitin-like modifier type 1 (SUMO-1) to lysines in the negative regulatory domain strongly suppresses its transcriptional activity. Here we report conjugation of two other members of the SUMO protein family, SUMO-2 and SUMO-3, and provide evidence that this post-translational modification negatively affects transcriptional activity of c-Myb. Conjugation of SUMO-2/3 proteins is strongly enhanced by several different cellular stresses and occurs primarily on two lysines, Lys(523) and Lys(499). These lysines are in the negative regulatory domain of c-Myb and also serve as acceptor sites for SUMO-1. Stress-induced SUMO-2/3 conjugation is very rapid and independent of activation of stress-activated protein kinases of the SAPK and JNK families. PIAS-3 protein was identified as a new c-Myb-specific SUMO-E3 ligase that both catalyzes conjugation of SUMO-2/3 proteins to c-Myb and exerts a negative effect on c-Myb-induced reporter gene activation. Interestingly, co-expression of a SPRING finger mutant of PIAS-3 significantly suppresses SUMOylation of c-Myb under stress. These results argue that PIAS-3 SUMO-E3 ligase plays a critical role in stress-induced conjugation of SUMO-2/3 to c-Myb. We also detected stress-induced conjugation of SUMO-2/3 to c-Myb in hematopoietic cells at the levels of endogenously expressed proteins. Furthermore, according to the negative role of SUMO conjugation on c-Myb capacity, we have observed rapid stress-induced down-regulation of the targets genes c-myc and bcl-2 of c-Myb. Our findings demonstrate that SUMO-2/3 proteins conjugate to c-Myb and negatively regulate its activity in cells under stress.
Collapse
MESH Headings
- Animals
- COS Cells
- Cell Line, Transformed
- Cell Line, Tumor
- Chlorocebus aethiops
- Down-Regulation/physiology
- Leukemia, Erythroblastic, Acute/enzymology
- Leukemia, Erythroblastic, Acute/genetics
- Leukemia, Erythroblastic, Acute/metabolism
- Lysine/genetics
- MAP Kinase Signaling System/genetics
- Mice
- Mutagenesis, Site-Directed
- Osmotic Pressure
- Protein Processing, Post-Translational/genetics
- Proto-Oncogene Proteins c-myb/antagonists & inhibitors
- Proto-Oncogene Proteins c-myb/genetics
- Proto-Oncogene Proteins c-myb/metabolism
- Proto-Oncogene Proteins c-myb/physiology
- Small Ubiquitin-Related Modifier Proteins/metabolism
- Small Ubiquitin-Related Modifier Proteins/physiology
- Stress, Physiological/enzymology
- Stress, Physiological/genetics
- Stress, Physiological/metabolism
- Trans-Activators/antagonists & inhibitors
- Trans-Activators/metabolism
- Ubiquitins/metabolism
- Ubiquitins/physiology
Collapse
Affiliation(s)
- Marek Sramko
- Center of Molecular Medicine, Cancer Research Institute, Slovak Academy of Sciences, 833 91 Bratislava, Slovakia
| | | | | | | | | |
Collapse
|
38
|
Nadeem FK, Blair D, McInerny CJ. Pol5p, a novel binding partner to Cdc10p in fission yeast involved in rRNA production. Mol Genet Genomics 2006; 276:391-401. [PMID: 16816948 DOI: 10.1007/s00438-006-0144-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2006] [Accepted: 06/08/2006] [Indexed: 10/24/2022]
Abstract
Cdc10p is a major component of the cell cycle transcription factor complex MBF that controls G1-S phase specific gene expression in the fission yeast Schizosaccharomyces pombe. Here, we describe the identification of a new binding partner to Cdc10p and Pol5p. Pol5p was discovered through a 2-hybrid screen, with the direct interaction confirmed by in vitro "pull-down" experiments with bacterially expressed proteins. Pol5p appears to have no role in cell cycle gene expression, but is instead required for rRNA production. Pol5p is an essential gene, expressed constitutively throughout both the mitotic and meiotic life cycles, and localises to the nucleus. Over-expressing Pol5p has no phenotype, but reducing levels of Pol5p inhibits rRNA production. Pol5p is shown to bind to rDNA promoter fragments. Potentially, we have identified a mechanism by which Cdc10p controls rDNA gene expression, therefore linking the cell cycle with cellular growth.
Collapse
MESH Headings
- Base Sequence
- Binding Sites/genetics
- Cell Cycle
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/metabolism
- DNA, Fungal/genetics
- DNA, Fungal/metabolism
- DNA, Ribosomal/genetics
- DNA, Ribosomal/metabolism
- Gene Expression Regulation, Fungal
- Genes, Fungal
- Models, Biological
- Molecular Sequence Data
- Phenotype
- Promoter Regions, Genetic
- Protein Binding
- RNA, Fungal/biosynthesis
- RNA, Ribosomal/biosynthesis
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Schizosaccharomyces/cytology
- Schizosaccharomyces/genetics
- Schizosaccharomyces/metabolism
- Schizosaccharomyces pombe Proteins/genetics
- Schizosaccharomyces pombe Proteins/metabolism
- Transcription Factors/genetics
- Transcription Factors/metabolism
Collapse
Affiliation(s)
- Farzana Khaliq Nadeem
- Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, Scotland, UK
| | | | | |
Collapse
|
39
|
Cavellán E, Asp P, Percipalle P, Farrants AKO. The WSTF-SNF2h chromatin remodeling complex interacts with several nuclear proteins in transcription. J Biol Chem 2006; 281:16264-71. [PMID: 16603771 DOI: 10.1074/jbc.m600233200] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The WSTF (Williams syndrome transcription factor) protein is involved in vitamin D-mediated transcription and replication as a component of two distinct ATP-dependent chromatin remodeling complexes, WINAC and WICH, respectively. We show here that the WICH complex (WSTF-SNF2h) interacts with several nuclear proteins as follows: Sf3b155/SAP155, RNA helicase II/Gualpha, Myb-binding protein 1a, CSB, the proto-oncogene Dek, and nuclear myosin 1 in a large 3-MDa assembly, B-WICH, during active transcription. B-WICH also contains RNAs, 45 S rRNA, 5 S rRNA, 7SL RNA, and traces of the U2 small nuclear RNA. The core proteins, WSTF, SNF2h, and nuclear myosin 1, are associated with the RNA polymerase III genes 5 S rRNA genes and 7SL, and post-transcriptional silencing of WSTF reduces the levels of these transcripts. Our results show that a WSTF-SNF2h assembly is involved in RNA polymerase III transcription, and we suggest that WSTF-SNF2h-NM1 forms a platform in transcription while providing chromatin remodeling.
Collapse
Affiliation(s)
- Erica Cavellán
- Department of Cell Biology, The Wenner-Gren Institute, Arrhenius Laboratories E5, Stockholm University, SE-106 91 Stockholm, Sweden
| | | | | | | |
Collapse
|
40
|
Breous E, Wenzel A, Loos U. Promoter cloning and characterisation of the transcriptional regulation of the human thyrostimulin A2 subunit. Mol Cell Endocrinol 2005; 245:169-80. [PMID: 16376481 DOI: 10.1016/j.mce.2005.11.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2005] [Revised: 11/10/2005] [Accepted: 11/11/2005] [Indexed: 11/23/2022]
Abstract
The novel heterodimeric glycoprotein hormone thyrostimulin consists of two unique subunits, A2 and B5. To understand its yet unknown transcriptional regulation, we characterised the 3.1-kb immediate 5'-flanking region of the human A2 gene localised on chromosome 11q13. In transient transfection assays this sequence exhibited promoter activity, which could be confined to nucleotides -506 to -347 relative to the ATG start codon. Interestingly, this minimal promoter appeared to be non-tissue-specific. Deletional, mutational and gel shift analyses revealed regulatory elements that are essential for the regulation of the A2 gene expression. Another noteworthy feature of this gene is the presence of silencer elements upstream and downstream of the promoter. To surmise, our results provide an initial step toward a detailed analysis of the underlying molecular mechanisms of the human thyrostimulin gene expression.
Collapse
Affiliation(s)
- Ekaterina Breous
- Department of Internal Medicine I, University of Ulm, Robert-Koch-Strasse 8, D-89081 Ulm, Germany
| | | | | |
Collapse
|
41
|
Affiliation(s)
- Robert G Ramsay
- Differentiation and Transcription Group, Trescowthick Laboratories, Peter MacCallum Cancer Institute, Victoria, and the University of Melbourne, Department of Pathology, Parkville, Australia.
| |
Collapse
|
42
|
Corradini F, Cesi V, Bartella V, Pani E, Bussolari R, Candini O, Calabretta B. Enhanced proliferative potential of hematopoietic cells expressing degradation-resistant c-Myb mutants. J Biol Chem 2005; 280:30254-62. [PMID: 15927960 DOI: 10.1074/jbc.m504703200] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The c-myb gene encodes a transcription factor required for proliferation, differentiation, and survival of hematopoietic cells. Expression of c-Myb is often increased in hematological malignancies, but the underlying mechanisms are poorly understood. We show here that c-Myb has a longer half-life (at least 2-fold) in BCR/ABL-expressing than in normal hematopoietic cells. Such enhanced stability was dependent on a phosphatidylinositol 3-kinase (PI-3K)/Akt/GSKIIIbeta pathway(s) as indicated by the suppression of c-Myb expression upon treatment with PI-3K inhibitors or co-expression with dominant negative Akt or constitutively active GSKIIIbeta. Moreover, inhibition of GSKIIIbeta by LiCl enhanced c-Myb expression in parental 32Dcl3 cells. Compared with wild type c-Myb, three mutants (delta(358-452), delta(389-418), and L389A/L396A c-Myb) of the leucine zipper domain had increased stability. However, only expression of delta(358-452) was not affected by inhibition of the PI-3K/Akt pathway and was not enhanced by a proteasome inhibitor, suggesting that leucine zipper-dependent and -independent mechanisms are involved in the regulation of c-Myb stability. Indeed, delta(389-418) carrying four lysine-to-alanine substitutions (delta(389-418) K387A/K428A/K442A/K445A) was as stable as delta(358-452) c-Myb. Compared with full-length c-Myb, constitutive expression of delta(358-452) and delta(389-418) c-Myb in Lin-Sca-1+ mouse marrow cells increased cytokine-dependent primary and secondary colony formation. In K562 cells, expression of delta(358-452), delta(389-418), and L389A/L396A c-Myb led to enhanced proliferation after STI571 treatment. Thus, enhanced stability of c-Myb by activation of PI-3K-dependent pathway(s) might contribute to the higher proliferative potential of BCR/ABL-expressing and, perhaps, other leukemic cells.
Collapse
Affiliation(s)
- Francesca Corradini
- Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson Medical College, Philadelphia, Pennsylvania 19107, USA
| | | | | | | | | | | | | |
Collapse
|
43
|
Abstract
Chronic exposure to benzene has been correlated with increased oxidative stress and leukemia. Oncogene activation, including c-Myb activation, is one of the earliest steps leading to the formation of leukemic cells, however the molecular mechanisms involved in these events are poorly understood. Given that oxidative stress can alter the activity and fate of cell signaling pathways we hypothesize that the bioactivation of benzene leads to the formation of reactive oxygen species (ROS), which if not detoxified can alter the c-Myb signaling pathway. Using chicken erythroblast HD3 cells we have shown that exposure to the benzene metabolites catechol, benzoquinone, and hydroquinone leads to increased c-Myb activity, increased phosphorylation of c-Myb and increased production of ROS supporting our hypothesis. Activation of the aryl hydrocarbon receptor (AhR) by environmental contaminants has also been associated with carcinogenesis and mice lacking this receptor are resistant to benzene-initiated hematotoxicity. Using wild type and AhR deficient cells we are investigating the role of this receptor in benzene-initiated alterations in the c-Myb signaling pathway. We have found that both wild type and AhR deficient cells are sensitive to catechol and hydroquinone-initiated increases in c-Myb activity while both cell types are resistant to benzene-initiated alterations leaving the role of the AhR still undetermined. Interestingly, protein expression of c-Myb is increased after catechol exposure in AhR deficient cells while decreased in wild-type cells. Further studies on the role of the AhR in benzene-initiated alterations on the c-Myb signaling pathway are on going.
Collapse
Affiliation(s)
- Joanne Wan
- Department of Pharmacology and Toxicology and School of Environmental Studies, Queen's University, Botterell Hall Room 557, Kingston, Ont., Canada K7L 3N6
| | | | | |
Collapse
|
44
|
Nomura T, Tanikawa J, Akimaru H, Kanei-Ishii C, Ichikawa-Iwata E, Khan MM, Ito H, Ishii S. Oncogenic activation of c-Myb correlates with a loss of negative regulation by TIF1beta and Ski. J Biol Chem 2004; 279:16715-26. [PMID: 14761981 DOI: 10.1074/jbc.m313069200] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The c-myb proto-oncogene product (c-Myb) regulates proliferation of hematopoietic cells by inducing the transcription of a group of target genes. Removal or mutations of the negative regulatory domain (NRD) in the C-terminal half of c-Myb leads to increased transactivating capacity and oncogenic activation. Here we report that TIF1beta directly binds to the NRD and negatively regulates the c-Myb-dependent trans-activation. In addition, three corepressors (Ski, N-CoR, and mSin3A) bind to the DNA-binding domain of c-Myb together with TIF1beta and recruit the histone deacetylase complex to c-Myb. Furthermore, the Drosophila TIF1beta homolog, Bonus, negatively regulates Drosophila Myb activity. The Ski corepressor competes with the coactivator CBP for binding to c-Myb, indicating that the selection of coactivators and corepressors is a key event for c-Myb-dependent transcription. Mutations or deletion of the NRD of c-Myb and the mutations found in the DNA-binding domain of v-Myb decrease the interaction with these corepressors and weaken the corepressor-induced negative regulation of Myb activity. These observations have conceptual implications for understanding how the nuclear oncogene is activated.
Collapse
Affiliation(s)
- Teruaki Nomura
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan
| | | | | | | | | | | | | | | |
Collapse
|
45
|
Schäfer R, Tchernitsa OI, Zuber J, Sers C. Dissection of signal-regulated transcriptional modules by signaling pathway interference in oncogene-transformed cells. ADVANCES IN ENZYME REGULATION 2004; 43:379-91. [PMID: 12791398 DOI: 10.1016/s0065-2571(02)00040-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Reinhold Schäfer
- Laboratory of Molecular Tumor Pathology, Charité, Humboldt University, Schumannstr. 20/21, D-10117, Berlin, Germany
| | | | | | | |
Collapse
|
46
|
Fan M, Rhee J, St-Pierre J, Handschin C, Puigserver P, Lin J, Jäeger S, Erdjument-Bromage H, Tempst P, Spiegelman BM. Suppression of mitochondrial respiration through recruitment of p160 myb binding protein to PGC-1alpha: modulation by p38 MAPK. Genes Dev 2004; 18:278-89. [PMID: 14744933 PMCID: PMC338281 DOI: 10.1101/gad.1152204] [Citation(s) in RCA: 244] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The transcriptional coactivator PPAR gamma coactivator 1 alpha (PGC-1alpha) is a key regulator of metabolic processes such as mitochondrial biogenesis and respiration in muscle and gluconeogenesis in liver. Reduced levels of PGC-1alpha in humans have been associated with type II diabetes. PGC-1alpha contains a negative regulatory domain that attenuates its transcriptional activity. This negative regulation is removed by phosphorylation of PGC-1alpha by p38 MAPK, an important kinase downstream of cytokine signaling in muscle and beta-adrenergic signaling in brown fat. We describe here the identification of p160 myb binding protein (p160MBP) as a repressor of PGC-1alpha. The binding and repression of PGC-1alpha by p160MBP is disrupted by p38 MAPK phosphorylation of PGC-1alpha. Adenoviral expression of p160MBP in myoblasts strongly reduces PGC-1alpha's ability to stimulate mitochondrial respiration and the expression of the genes of the electron transport system. This repression does not require removal of PGC-1alpha from chromatin, suggesting that p160MBP is or recruits a direct transcriptional suppressor. Overall, these data indicate that p160MBP is a powerful negative regulator of PGC-1alpha function and provide a molecular mechanism for the activation of PGC-1alpha by p38 MAPK. The discovery of p160MBP as a PGC-1alpha regulator has important implications for the understanding of energy balance and diabetes.
Collapse
Affiliation(s)
- Melina Fan
- Dana-Farber Cancer Institute and the Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Kumar A, Baker SJ, Lee CM, Reddy EP. Molecular mechanisms associated with the regulation of apoptosis by the two alternatively spliced products of c-Myb. Mol Cell Biol 2003; 23:6631-45. [PMID: 12944488 PMCID: PMC193713 DOI: 10.1128/mcb.23.18.6631-6645.2003] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The c-myb proto-oncogene encodes two alternatively spliced mRNAs, which in turn code for proteins of 75 kDa and 89 kDa. It is at present unclear whether the two isoforms of c-Myb perform identical functions or whether they mediate different biological effects. To assess their role in apoptotic death of hematopoietic cells, we expressed the two isoforms of c-Myb in the murine myeloid cell lines 32Dcl3 and FDCP1. Our results show that while ectopic overexpression of p75 c-Myb results in the acceleration of cell death, similar overexpression of p89 c-Myb results in the protection of cells from apoptotic death. An analysis of gene expression changes with mouse cDNA expression arrays revealed that while p75 c-Myb blocked the expression of glutathione S-transferase micro mRNA, p89 c-Myb greatly enhanced the expression of this gene. These results were further confirmed by Northern blot analysis. Ectopic overexpression of the glutathione S-transferase micro gene in 32Dcl3 cells resulted in protection of cells from interleukin-3 withdrawal-induced cell death similar to that seen with the ectopic overexpression of p89 c-Myb. These results suggest that the two isoforms of c-Myb differentially regulate apoptotic death of myeloid cells through differential regulation of glutathione S-transferase micro gene expression.
Collapse
Affiliation(s)
- Atul Kumar
- Fels Institute for Cancer Research and Molecular Biology, Temple University School of Medicine, 3307 N. Broad Street, Philadelphia, PA 19140, USA
| | | | | | | |
Collapse
|
48
|
Seong HA, Kim KT, Ha H. Enhancement of B-MYB transcriptional activity by ZPR9, a novel zinc finger protein. J Biol Chem 2003; 278:9655-62. [PMID: 12645566 DOI: 10.1074/jbc.m207478200] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
By using the yeast two-hybrid system, the zinc finger protein ZPR9 was identified as one of the B-MYB interacting proteins that associates with the carboxyl-terminal conserved region of B-MYB. ZPR9 was found to form in vivo complexes with B-MYB, as demonstrated by in vivo binding assay and coimmunoprecipitation experiments of the endogenously and exogenously expressed proteins. Deletion analysis revealed that this binding was mediated by all three functional domains, an amino-terminal DNA-binding domain, a transactivation domain, and a carboxyl-terminal conserved region of B-MYB. We show that the interaction of ZPR9 with B-MYB is functional because cotransfection of ZPR9 significantly up-regulates B-MYB transcriptional activity in a dose-dependent manner. In addition, coexpression of ZPR9 with B-MYB caused the accumulation of B-MYB, as well as ZPR9, in the nucleus. Furthermore, constitutive expression of ZPR9 in human neuroblastoma cells induces apoptosis in the presence of retinoic acid. These results strongly suggest that ZPR9 plays an important role in modulation of the transactivation by B-MYB and cellular growth of neuroblastoma cells.
Collapse
Affiliation(s)
- Hyun-A Seong
- Department of Biochemistry, School of Life Sciences, Research Center for Bioresource and Health, Chungbuk National University, Cheongju 361-763, Republic of Korea
| | | | | |
Collapse
|
49
|
Kampa D, Burnside J. Jak3-regulated genes: DNA array analysis of concanavalin a-interleukin-2-activated chicken T cells treated with a specific jak3 inhibitor. J Interferon Cytokine Res 2002; 22:975-80. [PMID: 12396719 DOI: 10.1089/10799900260286687] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Janus kinase 3 (Jak3) is important in the activation and proliferation of lymphoid cells and binds to the common gamma subunit of several cytokine receptors, including the interleukin-2 (IL-2) receptor (IL-2R). DNA arrays were used to measure mRNA levels of a large number of genes regulated by signaling through the Jak3 tyrosine kinase pathway by blocking concanavalin A (ConA)-IL-2-activated chicken splenic T cells with a specific Jak3 inhibitor (WHI-P154). Of the 635 genes detected by arrays containing about 1200 cDNAs, 12 were upregulated in control cells compared with inhibitor-treated cells, and 6 were expressed at higher levels in the inhibitor-treated group. By identifying genes that are directly or indirectly regulated by Jak3, we can gain insight into the roles of this key intermediate in avian T cell activation and further our understanding of intracellular signaling networks in the immune response.
Collapse
Affiliation(s)
- Dione Kampa
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19711, USA
| | | |
Collapse
|
50
|
Shimizu K, Kawasaki Y, Hiraga SI, Tawaramoto M, Nakashima N, Sugino A. The fifth essential DNA polymerase phi in Saccharomyces cerevisiae is localized to the nucleolus and plays an important role in synthesis of rRNA. Proc Natl Acad Sci U S A 2002; 99:9133-8. [PMID: 12093911 PMCID: PMC123106 DOI: 10.1073/pnas.142277999] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2002] [Accepted: 05/09/2002] [Indexed: 11/18/2022] Open
Abstract
We report that POL5 encodes the fifth essential DNA polymerase in Saccharomyces cerevisiae. Pol5p was identified and purified from yeast cell extracts and is an aphidicolin-sensitive DNA polymerase that is stimulated by yeast proliferating cell nuclear antigen (PCNA). Thus, we named Pol5p DNA polymerase phi. Temperature-sensitive pol5-1-- -3 mutants did not arrest at G(2)/M at the restrictive temperature. Furthermore, the polymerase active-site mutant POL5dn gene complements the lethality of Delta pol5. These results suggest that the polymerase activity of Pol5p is not required for the in vivo function of Pol5p. rRNA synthesis was severely inhibited at the restrictive temperature in the temperature-sensitive pol5-3 mutant cells, suggesting that an essential function of Pol5p is rRNA synthesis. Pol5p is localized exclusively to the nucleolus and binds near or at the enhancer region of rRNA-encoding DNA repeating units.
Collapse
Affiliation(s)
- Kikuo Shimizu
- Department of Biochemistry and Molecular Biology, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871, Japan
| | | | | | | | | | | |
Collapse
|