1
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Sharma S, Tyagi W, Tamang R, Das S. HDAC5 modulates SATB1 transcriptional activity to promote lung adenocarcinoma. Br J Cancer 2023; 129:586-600. [PMID: 37400677 PMCID: PMC10421875 DOI: 10.1038/s41416-023-02341-8] [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: 01/04/2023] [Revised: 05/29/2023] [Accepted: 06/20/2023] [Indexed: 07/05/2023] Open
Abstract
BACKGROUND Dysregulation of histone deacetylases has been linked to diverse cancers. HDAC5 is a histone deacetylase belonging to Class IIa family of histone deacetylases. Limited substrate repertoire restricts the understanding of molecular mechanisms underlying its role in tumorigenesis. METHODS We employed a biochemical screen to identify SATB1 as HDAC5-interacting protein. Coimmunoprecipitation and deacetylation assay were performed to validate SATB1 as a HDAC5 substrate. Proliferation, migration assay and xenograft studies were performed to determine the effect of HDAC5-SATB1 interaction on tumorigenesis. RESULTS Here we report that HDAC5 binds to and deacetylates SATB1 at the conserved lysine 411 residue. Furthermore, dynamic regulation of acetylation at this site is determined by TIP60 acetyltransferase. We also established that HDAC5-mediated deacetylation is critical for SATB1-dependent downregulation of key tumor suppressor genes. Deacetylated SATB1 also represses SDHA-induced epigenetic remodeling and anti-proliferative transcriptional program. Thus, SATB1 spurs malignant phenotype in a HDAC5-dependent manner. CONCLUSIONS Our study highlights the pivotal role of HDAC5 in tumorigenesis. Our findings provide key insights into molecular mechanisms underlying SATB1 promoted tumor growth and metastasis.
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Affiliation(s)
- Shalakha Sharma
- Molecular Oncology Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Witty Tyagi
- Molecular Oncology Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Rohini Tamang
- Molecular Oncology Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Sanjeev Das
- Molecular Oncology Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, 110067, India.
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2
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Erol A. Genotoxicity-Stimulated and CYLD-Driven Malignant Transformation. Cancer Manag Res 2022; 14:2339-2356. [PMID: 35958947 PMCID: PMC9362849 DOI: 10.2147/cmar.s373557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/28/2022] [Indexed: 11/23/2022] Open
Affiliation(s)
- Adnan Erol
- Independent Researcher, Istanbul, Turkey
- Correspondence: Adnan Erol, Email
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3
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Vien LT, Nga NT, Hue PTK, Kha THB, Hoang NH, Hue PT, Thien PN, Huang CYF, Van Kiem P, Thao DT. A New Liposomal Formulation of Hydrogenated Anacardic Acid to Improve Activities Against Cancer Stem Cells. Nat Prod Commun 2022. [DOI: 10.1177/1934578x221105696] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Anacardic acid (AA) is a natural active ingredient that accounts for 65% of the liquid extract from the shell of the cashew nut. Due to the stronger cytotoxic activity of hydrogenated AA (HAA) against NTERA-2 cancer stem cells (CSCs) than AA itself, HAA was co-conjugated with CD133 monoclonal antibody (mAb^CD133) into nanoliposomal particles (AMC). This nanoliposomal complex is expected to improved HAA activities against CSCs based on the targeting capacity of mAb^CD133 toward CD133, a typical CSCs’ surface marker. AMC was manufactured with a mean size of 100.9 nm, a zeta potential of −40.7 mV, and a PDI of 0.283. We report a 100% encapsulation efficiency of HAA into liposomes and a 90.7% conjugation efficiency with mAb^CD133. The penetration of AMC into NTERA-2 CSCs after 2 h was 83.7%. The AMC complex inhibited NTERA-2 growth with an IC50 (inhibition concentration at 50%) value of 75.83 ± 6.70 µM, showing the targeting ability and lower toxicity (IC50 > 100 µM) on healthy cells. The AMC nanoparticles also demonstrated significant potential apoptotic induction by activating caspase 3 activity by up to 2.57 and 2.06 folds compared to that of the negative control at 20 and 4 µM, respectively. This induction was significant improvement in comparison with that of unconjugated HAA ( P < .05). AMC presented a clear effect on the solid structure of NTERA-2 spheroids and significantly suppressed the proliferation of CSCs in the 3D tumorspheres with an IC50 = 64.25 ± 3.15 µM, compared to the free form with an IC50 = 82.22 ± 0.65 µM ( P < .05). Therefore, this nanoliposomal complex exhibits promising capacities as an effective material against NTERA-2 CSCs.
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Affiliation(s)
- Le Tri Vien
- Institute of Biopharmaceutical Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
- Institute of Health Research and Educational Development in Central Highlands, Pleiku City, Gia Lai, Vietnam
| | - Nguyen Thi Nga
- Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - Phung Thi Kim Hue
- Institute of Health Research and Educational Development in Central Highlands, Pleiku City, Gia Lai, Vietnam
| | | | | | - Pham Thi Hue
- Huynh Man Dat High School for the Gifted, Kien Giang, Vietnam
| | - Pham Ngoc Thien
- Huynh Man Dat High School for the Gifted, Kien Giang, Vietnam
| | - Chi-Ying F Huang
- Institute of Biopharmaceutical Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Phan Van Kiem
- Institute of Biopharmaceutical Sciences, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Do Thi Thao
- Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
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4
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Welsh N. Are off-target effects of imatinib the key to improving beta-cell function in diabetes? Ups J Med Sci 2022; 127:8841. [PMID: 36187072 PMCID: PMC9487420 DOI: 10.48101/ujms.v127.8841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/18/2022] [Accepted: 07/27/2022] [Indexed: 11/18/2022] Open
Abstract
The small tyrosine kinase (TK) inhibitor imatinib mesylate (Gleevec, STI571) protects against both type 1 and type 2 diabetes, but as it inhibits many TKs and other proteins, it is not clear by which mechanisms it acts. This present review will focus on the possibility that imatinib acts, at least in part, by improving beta-cell function and survival via off-target effects on beta-cell signaling/metabolic flow events. Particular attention will be given to the possibility that imatinib and other TK inhibitors function as inhibitors of mitochondrial respiration. A better understanding of how imatinib counteracts diabetes will possibly help to clarify the pathogenic role of beta-cell signaling events and mitochondrial function, and hopefully leading to improved treatment of the disease.
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Affiliation(s)
- Nils Welsh
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
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5
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Filipczak N, Jaromin A, Piwoni A, Mahmud M, Sarisozen C, Torchilin V, Gubernator J. A Triple Co-Delivery Liposomal Carrier That Enhances Apoptosis via an Intrinsic Pathway in Melanoma Cells. Cancers (Basel) 2019; 11:cancers11121982. [PMID: 31835393 PMCID: PMC6966600 DOI: 10.3390/cancers11121982] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 11/29/2022] Open
Abstract
The effectiveness of existing anti-cancer therapies is based mainly on the stimulation of apoptosis of cancer cells. Most of the existing therapies are somewhat toxic to normal cells. Therefore, the quest for nontoxic, cancer-specific therapies remains. We have demonstrated the ability of liposomes containing anacardic acid, mitoxantrone and ammonium ascorbate to induce the mitochondrial pathway of apoptosis via reactive oxygen species (ROS) production by the killing of cancer cells in monolayer culture and shown its specificity towards melanoma cells. Liposomes were prepared by a lipid hydration, freeze-and-thaw (FAT) procedure and extrusion through polycarbonate filters, a remote loading method was used for dug encapsulation. Following characterization, hemolytic activity, cytotoxicity and apoptosis inducing effects of loaded nanoparticles were investigated. To identify the anticancer activity mechanism of these liposomes, ROS level and caspase 9 activity were measured by fluorescence and by chemiluminescence respectively. We have demonstrated that the developed liposomal formulations produced a high ROS level, enhanced apoptosis and cell death in melanoma cells, but not in normal cells. The proposed mechanism of the cytotoxic action of these liposomes involved specific generation of free radicals by the iron ions mechanism.
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Affiliation(s)
- Nina Filipczak
- Department of Lipids and Liposomes, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland; (A.J.); (A.P.); (M.M.); (J.G.)
- Correspondence: or ; Tel.: +48-713-756-318
| | - Anna Jaromin
- Department of Lipids and Liposomes, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland; (A.J.); (A.P.); (M.M.); (J.G.)
| | - Adriana Piwoni
- Department of Lipids and Liposomes, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland; (A.J.); (A.P.); (M.M.); (J.G.)
| | - Mohamed Mahmud
- Department of Lipids and Liposomes, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland; (A.J.); (A.P.); (M.M.); (J.G.)
- Department of Food Science and Technology, Faculty of Agriculture, University of Misurata, Misurata 2478, Libya
| | - Can Sarisozen
- Center for Pharmaceutical Biotechnology and Nanomedicine, Northeastern University, Boston, MA 02115, USA; (C.S.); (V.T.)
| | - Vladimir Torchilin
- Center for Pharmaceutical Biotechnology and Nanomedicine, Northeastern University, Boston, MA 02115, USA; (C.S.); (V.T.)
- Department of Oncology, Radiotherapy and Plastic Surgery I.M. Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia
| | - Jerzy Gubernator
- Department of Lipids and Liposomes, Faculty of Biotechnology, University of Wroclaw, 50-383 Wroclaw, Poland; (A.J.); (A.P.); (M.M.); (J.G.)
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6
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Gutierrez DA, Vargas LM, Chandia-Cristi A, de la Fuente C, Leal N, Alvarez AR. c-Abl Deficiency Provides Synaptic Resiliency Against Aβ-Oligomers. Front Cell Neurosci 2019; 13:526. [PMID: 31849613 PMCID: PMC6902026 DOI: 10.3389/fncel.2019.00526] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 11/11/2019] [Indexed: 12/13/2022] Open
Abstract
Spine pathology has been implicated in the early onset of Alzheimer’s disease (AD), where Aβ-Oligomers (AβOs) cause synaptic dysfunction and loss. Previously, we described that pharmacological inhibition of c-Abl prevents AβOs-induced synaptic alterations. Hence, this kinase seems to be a key element in AD progression. Here, we studied the role of c-Abl on dendritic spine morphological changes induced by AβOs using c-Abl null neurons (c-Abl-KO). First, we characterized the effect of c-Abl deficiency on dendritic spine density and found that its absence increases dendritic spine density. While AβOs-treatment reduces the spine number in both wild-type (WT) and c-Abl-KO neurons, AβOs-driven spine density loss was not affected by c-Abl. We then characterized AβOs-induced morphological changes in dendritic spines of c-Abl-KO neurons. AβOs induced a decrease in the number of mushroom spines in c-Abl-KO neurons while preserving the populations of immature stubby, thin, and filopodia spines. Furthermore, synaptic contacts evaluated by PSD95/Piccolo clustering and cell viability were preserved in AβOs-exposed c-Abl-KO neurons. In conclusion, our results indicate that in the presence of AβOs c-Abl participates in synaptic contact removal, increasing susceptibility to AβOs damage. Its deficiency increases the immature spine population reducing AβOs-induced synapse elimination. Therefore, c-Abl signaling could be a relevant actor in the early stages of AD.
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Affiliation(s)
- Daniela A Gutierrez
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Lina M Vargas
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - América Chandia-Cristi
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Catalina de la Fuente
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Nancy Leal
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Alejandra R Alvarez
- Cell Signaling Laboratory, Faculty of Biological Science, Department of Cell and Molecular Biology, Center for Aging and Regeneration (CARE), Pontificia Universidad Católica de Chile, Santiago, Chile
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7
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Rust K, Tiwari MD, Mishra VK, Grawe F, Wodarz A. Myc and the Tip60 chromatin remodeling complex control neuroblast maintenance and polarity in Drosophila. EMBO J 2018; 37:embj.201798659. [PMID: 29997178 DOI: 10.15252/embj.201798659] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 05/28/2018] [Accepted: 05/29/2018] [Indexed: 02/04/2023] Open
Abstract
Stem cells establish cortical polarity and divide asymmetrically to simultaneously maintain themselves and generate differentiating offspring cells. Several chromatin modifiers have been identified as stemness factors in mammalian pluripotent stem cells, but whether these factors control stem cell polarity and asymmetric division has not been investigated so far. We addressed this question in Drosophila neural stem cells called neuroblasts. We identified the Tip60 chromatin remodeling complex and its interaction partner Myc as regulators of genes required for neuroblast maintenance. Knockdown of Tip60 complex members results in loss of cortical polarity, symmetric neuroblast division, and premature differentiation through nuclear entry of the transcription factor Prospero. We found that aPKC is the key target gene of Myc and the Tip60 complex subunit Domino in regulating neuroblast polarity. Our transcriptome analysis further showed that Domino regulates the expression of mitotic spindle genes previously identified as direct Myc targets. Our findings reveal an evolutionarily conserved functional link between Myc, the Tip60 complex, and the molecular network controlling cell polarity and asymmetric cell division.
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Affiliation(s)
- Katja Rust
- Molecular Cell Biology, Institute I for Anatomy, University of Cologne Medical School, Cologne, Germany .,Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases (CECAD), Cologne, Germany.,Stem Cell Biology, Institute for Anatomy and Cell Biology, Georg-August University Göttingen, Göttingen, Germany.,Department of Anatomy and OB-GYN/RS, University of California, San Francisco, San Francisco, CA, USA
| | - Manu D Tiwari
- Molecular Cell Biology, Institute I for Anatomy, University of Cologne Medical School, Cologne, Germany.,Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases (CECAD), Cologne, Germany.,Stem Cell Biology, Institute for Anatomy and Cell Biology, Georg-August University Göttingen, Göttingen, Germany
| | - Vivek Kumar Mishra
- Department of Dermatology and the Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, USA
| | - Ferdi Grawe
- Molecular Cell Biology, Institute I for Anatomy, University of Cologne Medical School, Cologne, Germany
| | - Andreas Wodarz
- Molecular Cell Biology, Institute I for Anatomy, University of Cologne Medical School, Cologne, Germany .,Cluster of Excellence-Cellular Stress Response in Aging-Associated Diseases (CECAD), Cologne, Germany.,Stem Cell Biology, Institute for Anatomy and Cell Biology, Georg-August University Göttingen, Göttingen, Germany
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8
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Li K, Zhang TT, Wang F, Cui B, Zhao CX, Yu JJ, Lv XX, Zhang XW, Yang ZN, Huang B, Li X, Hua F, Hu ZW. Metformin suppresses melanoma progression by inhibiting KAT5-mediated SMAD3 acetylation, transcriptional activity and TRIB3 expression. Oncogene 2018. [PMID: 29520103 DOI: 10.1038/s41388-018-0172-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Metformin has beneficial effects of preventing and treating cancers on type 2 diabetic patients. However, the role of metformin in non-diabetic cancer patients and the precise molecular mechanisms against cancer have not yet been sufficiently elucidated. We recently reported that the pseudokinase protein TRIB3 acts as a stress sensor linking metabolic stressors to cancer promotion by inhibiting autophagy and ubiquitin-proteasomal degradation systems; genetically abrogating of TRIB3 expression reduces tumourigenesis and cancer progression. Thus, TRIB3 is a potential therapeutic target for diverse cancers. In this study, we found that metformin attenuates melanoma growth and metastasis by reducing TRIB3 expression in non-diabetic C57BL/6 mice and diabetic KK-Ay mice; overexpression of TRIB3 protects metformin from the activation of autophagic flux, the clearance of accumulated tumour-promoting factors and the attenuation of tumour progression. We further elucidated that TRIB3 acts as an adaptor to recruit lysine acetyltransferase 5 (KAT5) to SMAD3 and induce a phosphorylation-dependent K333 acetylation of SMAD3, which sustains transcriptional activity of SMAD3 and subsequently enhances TRIB3 transcription. Metformin suppresses SMAD3 phosphorylation and decreases the KAT5/SMAD3 interaction, to attenuate the KAT5-mediated K333 acetylation of SMAD3, reduce the SMAD3 transcriptional activity and subsequent TRIB3 expression, thereby antagonizes melanoma progression. Together, our study not only defines a molecular mechanism by which metformin protects against melanoma progression by disturbing the KAT5/TRIB3/SMAD3 positive feedback loop in diabetes and non-diabetes mice, but also suggests a candidate diverse utility of metformin in tumour prevention and therapy because of suppressing stress protein TRIB3 expression.
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Affiliation(s)
- Ke Li
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China.,Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | | | - Feng Wang
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Bing Cui
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Chen-Xi Zhao
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Jiao-Jiao Yu
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Xiao-Xi Lv
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Xiao-Wei Zhang
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Zhao-Na Yang
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Bo Huang
- Institute of Basic Medicine, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China
| | - Xia Li
- Shandong University, Weihai, 264209, China
| | - Fang Hua
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China.
| | - Zhuo-Wei Hu
- Immunology and Cancer Pharmacology Group, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100050, China.
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9
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Acharya D, Hainer SJ, Yoon Y, Wang F, Bach I, Rivera-Pérez JA, Fazzio TG. KAT-Independent Gene Regulation by Tip60 Promotes ESC Self-Renewal but Not Pluripotency. Cell Rep 2018; 19:671-679. [PMID: 28445719 DOI: 10.1016/j.celrep.2017.04.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Revised: 03/01/2017] [Accepted: 03/30/2017] [Indexed: 12/11/2022] Open
Abstract
Although histone-modifying enzymes are generally assumed to function in a manner dependent on their enzymatic activities, this assumption remains untested for many factors. Here, we show that the Tip60 (Kat5) lysine acetyltransferase (KAT), which is essential for embryonic stem cell (ESC) self-renewal and pre-implantation development, performs these functions independently of its KAT activity. Unlike ESCs depleted of Tip60, KAT-deficient ESCs exhibited minimal alterations in gene expression, chromatin accessibility at Tip60 binding sites, and self-renewal, thus demonstrating a critical KAT-independent role of Tip60 in ESC maintenance. In contrast, KAT-deficient ESCs exhibited impaired differentiation into mesoderm and endoderm, demonstrating a KAT-dependent function in differentiation. Consistent with this phenotype, KAT-deficient mouse embryos exhibited post-implantation developmental defects. These findings establish separable KAT-dependent and KAT-independent functions of Tip60 in ESCs and during differentiation, revealing a complex repertoire of regulatory functions for this essential chromatin remodeling complex.
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Affiliation(s)
- Diwash Acharya
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Sarah J Hainer
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Yeonsoo Yoon
- Division of Genes and Development, Department of Pediatrics, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Feng Wang
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Ingolf Bach
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Jaime A Rivera-Pérez
- Division of Genes and Development, Department of Pediatrics, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Thomas G Fazzio
- Department of Molecular, Cell, and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
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10
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Zhu S, Pabla N, Tang C, He L, Dong Z. DNA damage response in cisplatin-induced nephrotoxicity. Arch Toxicol 2015; 89:2197-205. [PMID: 26564230 DOI: 10.1007/s00204-015-1633-3] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 10/29/2015] [Indexed: 01/17/2023]
Abstract
Cisplatin and its derivatives are widely used chemotherapeutic drugs for cancer treatment. However, they have debilitating side effects in normal tissues and induce ototoxicity, neurotoxicity, and nephrotoxicity. In kidneys, cisplatin preferentially accumulates in renal tubular cells causing tubular cell injury and death, resulting in acute kidney injury (AKI). Recent studies have suggested that DNA damage and the associated DNA damage response (DDR) are an important pathogenic mechanism of AKI following cisplatin treatment. Activation of DDR may lead to cell cycle arrest and DNA repair for cell survival or, in the presence of severe injury, kidney cell death. Modulation of DDR may provide novel renoprotective strategies for cancer patients undergoing cisplatin chemotherapy.
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Affiliation(s)
- Shiyao Zhu
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Navjotsingh Pabla
- Departments of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Chengyuan Tang
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Liyu He
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zheng Dong
- Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
- Department of Cellular Biology and Anatomy, Medical College of Georgia at Georgia Regents University and Charlie Norwood VA Medical Center, 1459 Laney Walker Blvd, Augusta, GA, 30912, USA.
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11
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Mahajan K, Mahajan NP. Cross talk of tyrosine kinases with the DNA damage signaling pathways. Nucleic Acids Res 2015; 43:10588-601. [PMID: 26546517 PMCID: PMC4678820 DOI: 10.1093/nar/gkv1166] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 10/21/2015] [Indexed: 01/19/2023] Open
Abstract
Tyrosine kinases respond to extracellular and intracellular cues by activating specific cellular signaling cascades to regulate cell cycle, growth, proliferation, differentiation and survival. Likewise, DNA damage response proteins (DDR) activated by DNA lesions or chromatin alterations recruit the DNA repair and cell cycle checkpoint machinery to restore genome integrity and cellular homeostasis. Several new examples have been uncovered in recent studies which reveal novel epigenetic and non-epigenetic mechanisms by which tyrosine kinases interact with DDR proteins to dictate cell fate, i.e. survival or apoptosis, following DNA damage. These studies reveal the ability of tyrosine kinases to directly regulate the activity of DNA repair and cell cycle check point proteins by tyrosine phosphorylation. In addition, tyrosine kinases epigenetically regulate DNA damage signaling pathways by modifying the core histones as well as chromatin modifiers at critical tyrosine residues. Thus, deregulated tyrosine kinase driven epigenomic alterations have profound implications in cancer, aging and genetic disorders. Consequently, targeting oncogenic tyrosine kinase induced epigenetic alterations has gained significant traction in overcoming cancer cell resistance to various therapies. This review discusses mechanisms by which tyrosine kinases interact with DDR pathways to regulate processes critical for maintaining genome integrity as well as clinical strategies for targeted cancer therapies.
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Affiliation(s)
- Kiran Mahajan
- Tumor Biology Department, Moffitt Cancer Center, 12902 Magnolia Drive, Tampa, FL 33612, USA Department of Oncological Sciences, University of South Florida, 12902 Magnolia Drive, Tampa, FL 33612, USA
| | - Nupam P Mahajan
- Drug Discovery Department, Moffitt Cancer Center, University of South Florida, 12902 Magnolia Drive, Tampa, FL 33612, USA Department of Oncological Sciences, University of South Florida, 12902 Magnolia Drive, Tampa, FL 33612, USA
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12
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Chang CY, Leu JD, Lee YJ. The actin depolymerizing factor (ADF)/cofilin signaling pathway and DNA damage responses in cancer. Int J Mol Sci 2015; 16:4095-120. [PMID: 25689427 PMCID: PMC4346946 DOI: 10.3390/ijms16024095] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 01/26/2015] [Accepted: 02/09/2015] [Indexed: 01/06/2023] Open
Abstract
The actin depolymerizing factor (ADF)/cofilin protein family is essential for actin dynamics, cell division, chemotaxis and tumor metastasis. Cofilin-1 (CFL-1) is a primary non-muscle isoform of the ADF/cofilin protein family accelerating the actin filamental turnover in vitro and in vivo. In response to environmental stimulation, CFL-1 enters the nucleus to regulate the actin dynamics. Although the purpose of this cytoplasm-nucleus transition remains unclear, it is speculated that the interaction between CFL-1 and DNA may influence various biological responses, including DNA damage repair. In this review, we will discuss the possible involvement of CFL-1 in DNA damage responses (DDR) induced by ionizing radiation (IR), and the implications for cancer radiotherapy.
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Affiliation(s)
- Chun-Yuan Chang
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei 112, Taiwan.
| | - Jyh-Der Leu
- Division of Radiation Oncology, Taipei City Hospital RenAi Branch, Taipei 106, Taiwan.
| | - Yi-Jang Lee
- Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei 112, Taiwan.
- Biophotonics & Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei 112, Taiwan.
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13
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Farria A, Li W, Dent SYR. KATs in cancer: functions and therapies. Oncogene 2015; 34:4901-13. [PMID: 25659580 PMCID: PMC4530097 DOI: 10.1038/onc.2014.453] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 11/25/2014] [Accepted: 11/25/2014] [Indexed: 12/12/2022]
Abstract
Post-translational acetylation of lysines is most extensively studied in histones, but this modification is also found in many other proteins and is implicated in a wide range of biological processes in both the cell nucleus and the cytoplasm. Like phosphorylation, acetylation patterns and levels are often altered in cancer, therefore small molecule inhibition of enzymes that regulate acetylation and deacetylation offers much potential for inhibiting cancer cell growth, as does disruption of interactions between acetylated residues and ‘reader’ proteins. For more than a decade now, histone deacetylase (HDAC) inhibitors have been investigated for their ability to increase acetylation and promote expression of tumor suppressor genes. However, emerging evidence suggests that acetylation can also promote cancer, in part by enhancing the functions of oncogenic transcription factors. In this review we focus on how acetylation of both histone and non-histone proteins may drive cancer, and we will discuss the implications of such changes on how patients are assigned to therapeutic agents. Finally, we will explore what the future holds in the design of small molecule inhibitors for modulation of levels or functions of acetylation states.
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Affiliation(s)
- A Farria
- Department of Epigenetics and Molecular Carcinogenesis, Center for Cancer Epigenetics, Graduate School of Biomedical Sciences, University of Texas M.D Anderson Cancer Center Science Park, Smithville, Texas, USA
| | - W Li
- Department of Epigenetics and Molecular Carcinogenesis, Center for Cancer Epigenetics, Graduate School of Biomedical Sciences, University of Texas M.D Anderson Cancer Center Science Park, Smithville, Texas, USA
| | - S Y R Dent
- Department of Epigenetics and Molecular Carcinogenesis, Center for Cancer Epigenetics, Graduate School of Biomedical Sciences, University of Texas M.D Anderson Cancer Center Science Park, Smithville, Texas, USA
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14
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Dynamics of posttranslational modifications of p53. COMPUTATIONAL AND MATHEMATICAL METHODS IN MEDICINE 2014; 2014:245610. [PMID: 24899917 PMCID: PMC4037116 DOI: 10.1155/2014/245610] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 04/06/2014] [Indexed: 11/25/2022]
Abstract
The latest experimental evidence indicates that acetylation of p53 at K164 (lysine 164) and K120 may induce directly cell apoptosis under severe DNA damage. However, previous cell apoptosis models only studied the effects of active and/or inactive p53, that is, phosphorylation/dephosphorylation of p53. In the present paper, based partly on Geva-Zatorsky et al. (2006) and Batchelor et al. (2008), we propose a new cell apoptosis network, in which p53 has three statuses, that is, unphosphorylated p53, phosphorylated p53, and acetylated p53. The time delay differential equations (DDEs) are formulated based on our network to investigate the dynamical insights of p53-induced cell apoptosis. In agreement with experiments (Loewer et al. (2010)), our simulations indicate that acetylated p53 accumulates gradually and then induces the proapoptotic protein Bax under enough DNA damage. Moreover, phosphorylated p53 oscillates and initiates cell repair during DNA damage.
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15
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Abstract
The mammalian ABL1 gene encodes the ubiquitously expressed nonreceptor tyrosine kinase ABL. In response to growth factors, cytokines, cell adhesion, DNA damage, oxidative stress, and other signals, ABL is activated to stimulate cell proliferation or differentiation, survival or death, retraction, or migration. ABL also regulates specialized functions such as antigen receptor signaling in lymphocytes, synapse formation in neurons, and bacterial adhesion to intestinal epithelial cells. Although discovered as the proto-oncogene from which the Abelson leukemia virus derived its Gag-v-Abl oncogene, recent results have linked ABL kinase activation to neuronal degeneration. This body of knowledge on ABL seems confusing because it does not fit the one-gene-one-function paradigm. Without question, ABL capabilities are encoded by its gene sequence and that molecular blueprint designs this kinase to be regulated by subcellular location-dependent interactions with inhibitors and substrate activators. Furthermore, ABL shuttles between the nucleus and the cytoplasm where it binds DNA and actin--two biopolymers with fundamental roles in almost all biological processes. Taken together, the cumulated results from analyses of ABL structure-function, ABL mutant mouse phenotypes, and ABL substrates suggest that this tyrosine kinase does not have its own agenda but that, instead, it has evolved to serve a variety of tissue-specific and context-dependent biological functions.
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16
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Chu YL, Wu X, Xu J, Watts JL, Her C. DNA damage induced MutS homologue hMSH4 acetylation. Int J Mol Sci 2013; 14:20966-82. [PMID: 24145748 PMCID: PMC3821653 DOI: 10.3390/ijms141020966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Revised: 09/16/2013] [Accepted: 10/08/2013] [Indexed: 11/24/2022] Open
Abstract
Acetylation of non-histone proteins is increasingly recognized as an important post-translational modification for controlling the actions of various cellular processes including DNA repair and damage response. Here, we report that the human MutS homologue hMSH4 undergoes acetylation following DNA damage induced by ionizing radiation (IR). To determine which acetyltransferases are responsible for hMSH4 acetylation in response to DNA damage, potential interactions of hMSH4 with hTip60, hGCN5, and hMof were analyzed. The results of these experiments indicate that only hMof interacts with hMSH4 in a DNA damage-dependent manner. Intriguingly, the interplay between hMSH4 and hMof manipulates the outcomes of nonhomologous end joining (NHEJ)-mediated DNA double strand break (DSB) repair and thereby controls cell survival in response to IR. This study also shows that hMSH4 interacts with HDAC3, by which HDAC3 negatively regulates the levels of hMSH4 acetylation. Interestingly, elevated levels of HDAC3 correlate with increased NHEJ-mediated DSB repair, suggesting that hMSH4 acetylation per se may not directly affect the role of hMSH4 in DSB repair.
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Affiliation(s)
- Yen-Lin Chu
- School of Molecular Biosciences, Mail Drop 64-7520, Washington State University, Pullman, WA 99164-7520, USA.
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17
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Sridevi P, Nhiayi MK, Setten RL, Wang JYJ. Persistent inhibition of ABL tyrosine kinase causes enhanced apoptotic response to TRAIL and disrupts the pro-apoptotic effect of chloroquine. PLoS One 2013; 8:e77495. [PMID: 24147007 PMCID: PMC3795698 DOI: 10.1371/journal.pone.0077495] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Accepted: 09/04/2013] [Indexed: 12/14/2022] Open
Abstract
TNF-Related Apoptosis Inducing Ligand (TRAIL) binds to and activates death receptors to stimulate caspase-8 and apoptosis with higher efficiency in cancer than normal cells but the development of apoptosis resistance has limited its clinical efficacy. We found that stable, but not transient knockdown of the ABL tyrosine kinase enhanced the apoptotic response to TRAIL. Re-expression of Abl, but not its nuclear import- or kinase-defective mutant, in the ABL-knockdown cells re-established apoptosis suppression. TRAIL is known to stimulate caspase-8 ubiquitination (Ub-C8), which can facilitate caspase-8 activation or degradation by the lysosomes. In the ABL-knockdown cells, we found a higher basal level of Ub-C8 that was not further increased by lysosomal inhibition. Re-expression of Abl in the ABL-knockdown cells reduced the basal Ub-C8, correlating with apoptosis suppression. We found that lysosomal inhibition by chloroquine (CQ) could also enhance TRAIL-induced apoptosis. However, this pro-apoptotic effect of CQ was lost in the ABL-knockdown cells but restored by Abl re-expression. Interestingly, kinase inhibition at the time of TRAIL stimulation was not sufficient to enhance apoptosis. Instead, persistent treatment for several days with imatinib, an ABL kinase inhibitor, was required to cause the enhanced and the CQ-insensitive apoptotic response to TRAIL. Together, these results show that persistent loss of nuclear ABL tyrosine kinase function can sensitize cells to TRAIL and suggest that long-term exposure to the FDA-approved ABL kinase inhibitors may potentiate apoptotic response to TRAIL-based cancer therapy.
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Affiliation(s)
- Priya Sridevi
- Moores Cancer Center, Division of Hematology-Oncology, Department of Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America
| | - May K. Nhiayi
- Moores Cancer Center, Division of Hematology-Oncology, Department of Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America
| | - Ryan L. Setten
- Moores Cancer Center, Division of Hematology-Oncology, Department of Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America
| | - Jean Y. J. Wang
- Moores Cancer Center, Division of Hematology-Oncology, Department of Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America
- * E-mail:
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18
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Shin SH, Kang SS. Phosphorylation of Tip60 Tyrosine 327 by Abl Kinase Inhibits HAT Activity through Association with FE65. Open Biochem J 2013. [PMID: 24044023 PMCID: PMC3772572 DOI: 10.2174/1874091x20130622002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The transfer of acetyl groups from acetyl coenzyme A to the ε amino group of internal lysine residues is catalyzed by Tip60, which is in the MYST family of nuclear histone acetyltransferases (HATs). The tyrosine phosphorylation of Tip60 seems to be a unique modification. We present evidence that Tip60 is modified on tyrosine 327 by Abl kinase. We show that this causes functional changes in HAT activity and the subcellular localization of TIP60, which forms a complex with Abl kinase. The Tip60 mutation Y327F abolished tyrosine phosphorylation, reduced the inhibition of Tip60 HAT activity, and caused G0-G1 arrest and association with FE65. Thus, our findings for the first time suggested a novel regulation mechanism of Tip60. Regulation was through phosphorylation of tyrosine 327 by Abl tyrosine kinase and depended on environmental conditions, suggesting that the tyrosine residue of Tip60 is important for the activation process.
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Affiliation(s)
- Sung Hwa Shin
- Department of Biology Education, Chungbuk National University, 410 Seongbong Road, Heungdok-gu, Cheongju, Chungbuk, 361-763, Republic of Korea ; Bio Center, Chungbuk Technopark, Ochang-eup, Cheongwon, Chungbuk, 363-883, Republic of Korea
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19
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Shin SH, Kang SS. Phosphorylation of Tip60 Tyrosine 327 by Abl Kinase Inhibits HAT Activity through Association with FE65. Open Biochem J 2013; 7:66-72. [PMID: 24044023 DOI: 10.2174/1874091x20130621002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 05/21/2013] [Accepted: 05/27/2013] [Indexed: 11/22/2022] Open
Abstract
The transfer of acetyl groups from acetyl coenzyme A to the ε amino group of internal lysine residues is catalyzed by Tip60, which is in the MYST family of nuclear histone acetyltransferases (HATs). The tyrosine phosphorylation of Tip60 seems to be a unique modification. We present evidence that Tip60 is modified on tyrosine 327 by Abl kinase. We show that this causes functional changes in HAT activity and the subcellular localization of TIP60, which forms a complex with Abl kinase. The Tip60 mutation Y327F abolished tyrosine phosphorylation, reduced the inhibition of Tip60 HAT activity, and caused G0-G1 arrest and association with FE65. Thus, our findings for the first time suggested a novel regulation mechanism of Tip60. Regulation was through phosphorylation of tyrosine 327 by Abl tyrosine kinase and depended on environmental conditions, suggesting that the tyrosine residue of Tip60 is important for the activation process.
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Affiliation(s)
- Sung Hwa Shin
- Department of Biology Education, Chungbuk National University, 410 Seongbong Road, Heungdok-gu, Cheongju, Chungbuk, 361-763, Republic of Korea ; Bio Center, Chungbuk Technopark, Ochang-eup, Cheongwon, Chungbuk, 363-883, Republic of Korea
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20
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Kaidi A, Jackson SP. KAT5 tyrosine phosphorylation couples chromatin sensing to ATM signalling. Nature 2013; 498:70-4. [PMID: 23708966 PMCID: PMC3859897 DOI: 10.1038/nature12201] [Citation(s) in RCA: 142] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 04/18/2013] [Indexed: 12/14/2022]
Abstract
The detection of DNA lesions within chromatin represents a critical step in cellular responses to DNA damage. However, the regulatory mechanisms that couple chromatin sensing to DNA-damage signalling in mammalian cells are not well understood. Here we show that tyrosine phosphorylation of the protein acetyltransferase KAT5 (also known as TIP60) increases after DNA damage in a manner that promotes KAT5 binding to the histone mark H3K9me3. This triggers KAT5-mediated acetylation of the ATM kinase, promoting DNA-damage-checkpoint activation and cell survival. We also establish that chromatin alterations can themselves enhance KAT5 tyrosine phosphorylation and ATM-dependent signalling, and identify the proto-oncogene c-Abl as a mediator of this modification. These findings define KAT5 tyrosine phosphorylation as a key event in the sensing of genomic and chromatin perturbations, and highlight a key role for c-Abl in such processes.
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Affiliation(s)
- Abderrahmane Kaidi
- The Gurdon Institute and Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK
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21
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Kaplun A, Dzinic S, Bernardo M, Sheng S. Tumor suppressor maspin as a rheostat in HDAC regulation to achieve the fine-tuning of epithelial homeostasis. Crit Rev Eukaryot Gene Expr 2013; 22:249-58. [PMID: 23140166 DOI: 10.1615/critreveukargeneexpr.v22.i3.80] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Maspin, a class II tumor suppressor, is often downregulated during tumor progression and its depletion from the nucleus is associated with poor prognosis. Recently, we reported that reintroduction of maspin is sufficient for redifferentiation of prostate cancer cells to epithelial phenotype, a reversal of epithelial-to-mesenchymal transition. We have linked this effect of maspin with its ability to directly inhibit HDAC1, thereby influencing the acetylation state of transcription factors and other proteins. Maspin overexpression leads to changes in the expression level of a large number of proteins and these changes are often microenvironment specific. In this review, we summarize the epigenetic effects of maspin and provide comprehensive bioinformatic analysis of microarray-derived gene expression changes caused by maspin in different microenvironments. The analysis was performed on multiple levels, including identification of statistically enriched gene ontology groups, detection of overreprepresented transcription factors binding sites in promoters of differentially expressed genes, followed by searching for key nodes of regulatory networks controlling these transcription factors. The results are consistent with our hypothesis that maspin serves as an endogenous regulator of HDAC activity and suggest that the effect of maspin is primarily mediated by TGFβ, β-catenin/E-cadherin pathways, and network key nodes such as Abl kinase, p62, IL1, and caspases 6 and 8.
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Affiliation(s)
- Alexander Kaplun
- Department of Pathology, Karmanos Cancer Institute, Wayne State University School of Medicine, 4100 John R Street, Detroit, MI 48201, USA
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22
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Targeting DNA damage response: threshold, chromatin landscape and beyond. Pharmacol Ther 2013; 138:46-52. [PMID: 23291058 DOI: 10.1016/j.pharmthera.2012.12.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 12/13/2012] [Indexed: 12/24/2022]
Abstract
Cells are continually exposed to DNA assaults from exogenous and endogenous sources. To maintain genomic integrity, cells have evolved a highly conserved mechanism for repairing DNA lesions and, in particular, DNA double strand breaks (DSBs). Emerging evidence indicates that DNA repair/signaling machinery acts in an integrated fashion with chromatin structure at damaged sites. This review focuses on the interplay between histone modifications and the chromatin-mediated response to DNA damage.
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Stabilization of p21 (Cip1/WAF1) following Tip60-dependent acetylation is required for p21-mediated DNA damage response. Cell Death Differ 2012; 20:620-9. [PMID: 23238566 DOI: 10.1038/cdd.2012.159] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The molecular mechanisms controlling post-translational modifications of p21 have been pursued assiduously in recent years. Here, utilizing mass-spectrometry analysis and site-specific acetyl-p21 antibody, two lysine residues of p21, located at amino-acid sites 161 and 163, were identified as Tip60-mediated acetylation targets for the first time. Detection of adriamycin-induced p21 acetylation, which disappeared after Tip60 depletion with concomitant destabilization of p21 and disruption of G1 arrest, suggested that Tip60-mediated p21 acetylation is necessary for DNA damage-induced cell-cycle regulation. The ability of 2KQ, a mimetic of acetylated p21, to induce cell-cycle arrest and senescence was significantly enhanced in p21 null MEFs compared with those of cells expressing wild-type p21. Together, these observations demonstrate that Tip60-mediated p21 acetylation is a novel and essential regulatory process required for p21-dependent DNA damage-induced cell-cycle arrest.
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Reply to: Cisplatin-induced primordial follicle oocyte killing and loss of fertility are not prevented by imatinib. Nat Med 2012; 18:1172-4. [PMID: 22869180 DOI: 10.1038/nm.2852] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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