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Mitra P. Transcription regulation of MYB: a potential and novel therapeutic target in cancer. ANNALS OF TRANSLATIONAL MEDICINE 2018; 6:443. [PMID: 30596073 DOI: 10.21037/atm.2018.09.62] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Basal transcription factors have never been considered as a priority target in the field of drug discovery. However, their unparalleled roles in decoding the genetic information in response to the appropriate signal and their association with the disease progression are very well-established phenomena. Instead of considering transcription factors as such a target, in this review, we discuss about the potential of the regulatory mechanisms that control their gene expression. Based on our recent understanding about the critical roles of c-MYB at the cellular and molecular level in several types of cancers, we discuss here how MLL-fusion protein centred SEC in leukaemia, ligand-estrogen receptor (ER) complex in breast cancer (BC) and NF-κB and associated factors in colorectal cancer regulate the transcription of this gene. We further discuss plausible strategies, specific to each cancer type, to target those bona fide activators/co-activators, which control the regulation of this gene and therefore to shed fresh light in targeting the transcriptional regulation as a novel approach to the future drug discovery in cancer.
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Affiliation(s)
- Partha Mitra
- Pre-clinical Division, Vaxxas Pty. Ltd. Translational Research Institute, Woolloongabba QLD 4102, Australia.,Institute of Health and Biomedical Innovation, Queensland University of Technology, Translational Research Institute, Woolloongabba QLD 4102, Australia
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2
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Kim D, You E, Jeong J, Ko P, Kim JW, Rhee S. DDR2 controls the epithelial-mesenchymal-transition-related gene expression via c-Myb acetylation upon matrix stiffening. Sci Rep 2017; 7:6847. [PMID: 28754957 PMCID: PMC5533734 DOI: 10.1038/s41598-017-07126-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 06/23/2017] [Indexed: 02/03/2023] Open
Abstract
Increasing matrix stiffness caused by the extracellular matrix (ECM) deposition surrounding cancer cells is accompanied by epithelial-mesenchymal transition (EMT). Here, we show that expression levels of EMT marker genes along with discoidin domain receptor 2 (DDR2) can increase upon matrix stiffening. DDR2 silencing by short hairpin RNA downregulated EMT markers. Promoter analysis and chromatin immunoprecipitation revealed that c-Myb and LEF1 may be responsible for DDR2 induction during cell culture on a stiff matrix. Mechanistically, c-Myb acetylation by p300, which is upregulated on the stiff matrix, seems to be necessary for the c-Myb-and-LEF1-mediated DDR2 expression. Finally, we found that the c-Myb-DDR2 axis is crucial for lung cancer cell line proliferation and expression of EMT marker genes in a stiff environment. Thus, our results suggest that DDR2 regulation by p300 expression and/or c-Myb acetylation upon matrix stiffening may be necessary for regulation of EMT and invasiveness of lung cancer cells.
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Affiliation(s)
- Daehwan Kim
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Eunae You
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Jangho Jeong
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Panseon Ko
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Jung-Woong Kim
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Sangmyung Rhee
- Department of Life Science, Chung-Ang University, Seoul, 06974, Republic of Korea.
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3
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Zhu C, Yamaguchi K, Ohsugi T, Terakado Y, Noguchi R, Ikenoue T, Furukawa Y. Identification of FERM domain-containing protein 5 as a novel target of β-catenin/TCF7L2 complex. Cancer Sci 2017; 108:612-619. [PMID: 28117551 PMCID: PMC5406541 DOI: 10.1111/cas.13174] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 01/13/2017] [Accepted: 01/18/2017] [Indexed: 01/08/2023] Open
Abstract
Deregulation of the canonical Wnt signaling pathway plays an important role in human tumorigenesis through the accumulation of β‐catenin and subsequent transactivation of TCF7L2. Although some of the consequences associated with the accumulated β‐catenin have been clarified, the comprehensive effect of activated β‐catenin/TCF7L2 transcriptional complex on tumorigenesis remains to be elucidated. To understand the precise molecular mechanisms underlying colorectal cancer, we searched for genes regulated by the complex in colorectal tumors. We performed expression profile analysis of HCT116 and SW480 colon cancer cells treated with β‐catenin siRNAs, and ChIP‐sequencing using anti‐TCF7L2 antibody. Combination of these data with public microarray data of LS174 cells with a dominant‐negative form of TCF7L2 identified a total of 11 candidate genes. In this paper, we focused on FERM domain‐containing protein 5 (FRMD5), and confirmed that it is regulated by both β‐catenin and TCF7L2. An additional reporter assay disclosed that a region in intron1 transcriptionally regulated the expression of FRMD5. ChIP assay also corroborated that TCF7L2 associates with this region. These data suggested that FRMD5 is a novel direct target of the β‐catenin/TCF7L2 complex.
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Affiliation(s)
- Chi Zhu
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Kiyoshi Yamaguchi
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Tomoyuki Ohsugi
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Yumi Terakado
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Rei Noguchi
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Tsuneo Ikenoue
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Yoichi Furukawa
- Division of Clinical Genome Research, Advanced Clinical Research Center, Institute of Medical Science, The University of Tokyo, Tokyo, Japan
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4
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Polosukhina D, Love HD, Correa H, Su Z, Dahlman KB, Pao W, Moses HL, Arteaga CL, Lovvorn HN, Zent R, Clark PE. Functional KRAS mutations and a potential role for PI3K/AKT activation in Wilms tumors. Mol Oncol 2017; 11:405-421. [PMID: 28188683 PMCID: PMC5378659 DOI: 10.1002/1878-0261.12044] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 01/18/2017] [Accepted: 02/02/2017] [Indexed: 12/18/2022] Open
Abstract
Wilms tumor (WT) is the most common renal neoplasm of childhood and affects 1 in 10 000 children aged less than 15 years. These embryonal tumors are thought to arise from primitive nephrogenic rests that derive from the metanephric mesenchyme during kidney development and are characterized partly by increased Wnt/β-catenin signaling. We previously showed that coordinate activation of Ras and β-catenin accelerates the growth and metastatic progression of a murine WT model. Here, we show that activating KRAS mutations can be found in human WT. In addition, high levels of phosphorylated AKT are present in the majority of WT. We further show in a mouse model and in renal epithelial cells that Ras cooperates with β-catenin to drive metastatic disease progression and promotes in vitro tumor cell growth, migration, and colony formation in soft agar. Cellular transformation and metastatic disease progression of WT cells are in part dependent on PI3K/AKT activation and are inhibited via pharmacological inhibition of this pathway. Our studies suggest both KRAS mutations and AKT activation are present in WT and may represent novel therapeutic targets for this disease.
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Affiliation(s)
- Dina Polosukhina
- Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Harold D Love
- Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Hernan Correa
- Department of Pathology, Microbiology & Immunology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Zengliu Su
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
| | - Kimberly B Dahlman
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA.,Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN, USA
| | - William Pao
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA.,Department of Medicine (Hematology-Oncology), Vanderbilt University Medical Center, Nashville, TN, USA
| | - Harold L Moses
- Department of Pathology, Microbiology & Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.,Vanderbilt-Ingram Cancer Center, Nashville, TN, USA.,Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN, USA.,Department of Medicine (Hematology-Oncology), Vanderbilt University Medical Center, Nashville, TN, USA
| | - Carlos L Arteaga
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA.,Department of Cancer Biology, Vanderbilt University Medical Center, Nashville, TN, USA.,Department of Medicine (Hematology-Oncology), Vanderbilt University Medical Center, Nashville, TN, USA
| | - Harold N Lovvorn
- Department of Pediatric Surgery, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Roy Zent
- Department of Medicine, Nephrology & Cancer Biology Division, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Peter E Clark
- Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, TN, USA.,Vanderbilt-Ingram Cancer Center, Nashville, TN, USA
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5
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Xing T, Tan X, Yu Q, Yang T, Fang R. Identifying the location of epidermal growth factor-responsive element involved in the regulation of type IIb sodium-phosphate cotransporter expression in porcine intestinal epithelial cells. J Anim Physiol Anim Nutr (Berl) 2016; 101:1249-1258. [PMID: 27896869 DOI: 10.1111/jpn.12645] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 10/16/2016] [Indexed: 12/14/2022]
Abstract
Phosphate is an important mineral nutrient for both human and animals in growth and physiological functions; thus, much effort in the past has been made to clarify the mechanisms governing its absorption. Previous studies have found that epidermal growth factor (EGF) inhibits phosphate absorption in human intestinal cells via modulating the interaction of transcriptional factor c-myb with sodium-phosphate cotransporter (NaPi-IIb) gene promoter. This finding provoked our interest in determining the effect of EGF on NaPi-IIb gene expression in intestinal cells of pigs and the location of EGF-responsive element in the gene promoter. Using quantitative PCR, it was observed that EGF significantly reduced NaPi-IIb gene expression in porcine intestinal epithelial IPEC-J2 cells. Transfection with a series of constructs that contain different lengths of the 5'-flanking promoter region of the NaPi-IIb gene manifested that EGF-responsive element is located in the -1200 to -800 region. Further, c-myb was extracted from the cell nucleus of IPEC cells that were exposed to EGF or not via immunoprecipitation. The electrophoretic mobility shift assay showed a specific binding of transcription factor c-myb to labelled probes encompassing DNA sequence from -1092 to -1085 (-TCCAGTTG-). This protein-DNA complex was decreased with cells exposed to EGF and abrogated when c-myb was pre-incubated with excessive unlabelled competitive probes. Results from mutagenesis studies demonstrated that the c-myb-binding site is the EGF-responsive element involved in the regulation of NaPi-IIb expression. Identifying the location of EGF-responsive element contributes to understanding mechanisms underlying EGF down-regulated NaPi-IIb gene expression and provides a foundation for further investigating EGF-regulatory functions in phosphate absorption in pig intestine.
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Affiliation(s)
- T Xing
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
| | - X Tan
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
| | - Q Yu
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
| | - T Yang
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
| | - R Fang
- College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
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6
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Shikatani EA, Chandy M, Besla R, Li CC, Momen A, El-Mounayri O, Robbins CS, Husain M. c-Myb Regulates Proliferation and Differentiation of Adventitial Sca1+ Vascular Smooth Muscle Cell Progenitors by Transactivation of Myocardin. Arterioscler Thromb Vasc Biol 2016; 36:1367-76. [PMID: 27174098 DOI: 10.1161/atvbaha.115.307116] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Accepted: 04/29/2016] [Indexed: 02/04/2023]
Abstract
OBJECTIVE Vascular smooth muscle cells (VSMCs) are believed to dedifferentiate and proliferate in response to vessel injury. Recently, adventitial progenitor cells were implicated as a source of VSMCs involved in vessel remodeling. c-Myb is a transcription factor known to regulate VSMC proliferation in vivo and differentiation of VSMCs from mouse embryonic stem cell-derived progenitors in vitro. However, the role of c-Myb in regulating specific adult vascular progenitor cell populations was not known. Our objective was to examine the role of c-Myb in the proliferation and differentiation of Sca1(+) adventitial VSMC progenitor cells. APPROACH AND RESULTS Using mice with wild-type or hypomorphic c-myb (c-myb(h/h)), BrdU (bromodeoxyuridine) uptake and flow cytometry revealed defective proliferation of Sca1(+) adventitial VSMC progenitor cells at 8, 14, and 28 days post carotid artery denudation injury in c-myb(h/h) arteries. c-myb(h/h) cKit(+)CD34(-)Flk1(-)Sca1(+)CD45(-)Lin(-) cells failed to proliferate, suggesting that c-myb regulates the activation of specific Sca1(+) progenitor cells in vivo and in vitro. Although expression levels of transforming growth factor-β1 did not vary between wild-type and c-myb(h/h) carotid arteries, in vitro differentiation of c-myb(h/h) Sca1(+) cells manifested defective transforming growth factor-β1-induced VSMC differentiation. This is mediated by reduced transcriptional activation of myocardin because chromatin immunoprecipitation revealed c-Myb binding to the myocardin promoter only during differentiation of Sca1(+) cells, myocardin promoter mutagenesis identified 2 specific c-Myb-responsive binding sites, and adenovirus-mediated expression of myocardin rescued the phenotype of c-myb(h/h) progenitors. CONCLUSIONS These data support a role for c-Myb in the regulation of VSMC progenitor cells and provide novel insight into how c-myb regulates VSMC differentiation through myocardin.
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Affiliation(s)
- Eric A Shikatani
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Mark Chandy
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Rickvinder Besla
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Cedric C Li
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Abdul Momen
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Omar El-Mounayri
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Clinton S Robbins
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada
| | - Mansoor Husain
- From the Toronto General Research Institute, University Health Network, Toronto, Ontario, Canada (E.A.S., M.C., R.B., A.M., O.E.-M., C.S.R., M.H.); and Heart and Stroke Richard Lewar Centre of Excellence, Ted Rogers Centre for Heart Research, McEwen Centre for Regenerative Medicine, and Peter Munk Cardiac Centre (E.A.S., M.C., R.B., C.S.R., M.H.), Department of Laboratory Medicine and Pathobiology (E.A.S., R.B., C.S.R., M.H.), Department of Immunology (C.C.L., C.S.R.), and Department of Medicine (M.C., M.H.), University of Toronto, Ontario, Canada.
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7
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Li H, Hai J, Zhou J, Yuan G. Exploration of binding affinity and selectivity of brucine with G-quadruplex in the c-myb proto-oncogene by electrospray ionization mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:407-414. [PMID: 26754134 DOI: 10.1002/rcm.7454] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 11/07/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE The c-myb gene is a potential therapeutic target for human tumors and leukemias. Active ingredients from natural products may be used as drugs in chemotherapy for human cancers. Here, electrospray ionization mass spectrometry (ESI-MS) was used to probe the formation and recognition of the G-quadruplex structure from the G-rich sequence that is found in the c-myb gene promoter, 5'-GGGCTGGGCTGGGCGGGG-3'. The aim of our study is to evaluate a potential binder for the c-myb gene from natural products, and thereby to modulate c-myb gene expression. METHODS ESI-MS, as an effective method, was utilized not only to characterize the formation of the G-quadruplex in the c-myb oncogene, but also as a tool to probe the binding characteristics of alkaloid molecules with the target G-quadruplex DNA. RESULTS ESI-MS results with the support of circular dichroism (CD) spectra demonstrated the formation of an intramolecular parallel-stranded G-quadruplex in the c-myb oncogene promoter. A screening of six alkaloid molecules showed that brucine (P1) had a strong binding affinity to the c-myb G-quadruplex DNA. It is notable that P1 can bind selectively to the c-myb G-quadruplex with respect to duplex DNAs, as well as to G-quadruplexes in other types of gene sequences. According to ESI-MS results, in which the stability was tested by capillary heating and collision-induced dissociation, the binding of P1 could thermally stabilize the c-myb G-quadruplex DNA. CONCLUSIONS In this work, brucine (P1), an alkaloid molecule, has been found to bind to the intramolecular parallel G-quadruplex in the c-myb oncogene promoter with high affinity and selectivity, and could thermally stabilize the c-myb G-quadruplex DNA, indicating that the binding of P1 has the potential to modulate c-myb gene expression. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Huihui Li
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Jinhui Hai
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Jiang Zhou
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Gu Yuan
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
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8
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Malaterre J, Pereira L, Putoczki T, Millen R, Paquet-Fifield S, Germann M, Liu J, Cheasley D, Sampurno S, Stacker SA, Achen MG, Ward RL, Waring P, Mantamadiotis T, Ernst M, Ramsay RG. Intestinal-specific activatable Myb initiates colon tumorigenesis in mice. Oncogene 2015; 35:2475-84. [PMID: 26300002 PMCID: PMC4867492 DOI: 10.1038/onc.2015.305] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 05/31/2015] [Accepted: 07/13/2015] [Indexed: 02/07/2023]
Abstract
Transcription factor Myb is overexpressed in most colorectal cancers (CRC). Patients with CRC expressing the highest Myb are more likely to relapse. We previously showed that mono-allelic loss of Myb in an Adenomatous polyposis coli (APC)-driven CRC mouse model (ApcMin/+) significantly improves survival. Here we directly investigated the association of Myb with poor prognosis and how Myb co-operates with tumor suppressor genes (TSGs) (Apc) and cell cycle regulator, p27. Here we generated the first intestinal-specific, inducible transgenic model; a MybER transgene encoding a tamoxifen-inducible fusion protein between Myb and the estrogen receptor-α ligand-binding domain driven by the intestinal-specific promoter, Gpa33. This was to mimic human CRC with constitutive Myb activity in a highly tractable mouse model. We confirmed that the transgene was faithfully expressed and inducible in intestinal stem cells (ISCs) before embarking on carcinogenesis studies. Activation of the MybER did not change colon homeostasis unless one p27 allele was lost. We then established that MybER activation during CRC initiation using a pro-carcinogen treatment, azoxymethane (AOM), augmented most measured aspects of ISC gene expression and function and accelerated tumorigenesis in mice. CRC-associated symptoms of patients including intestinal bleeding and anaemia were faithfully mimicked in AOM-treated MybER transgenic mice and implicated hypoxia and vessel leakage identifying an additional pathogenic role for Myb. Collectively, the results suggest that Myb expands the ISC pool within which CRC is initiated while co-operating with TSG loss. Myb further exacerbates CRC pathology partly explaining why high MYB is a predictor of worse patient outcome.
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Affiliation(s)
- J Malaterre
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia
| | - L Pereira
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - T Putoczki
- Walter and Elisa Hall Institute of Medical Research, Melbourne, Victoria, Australia
| | - R Millen
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia.,Department of Pathology, The University of Melbourne, Melbourne, Victoria, Australia
| | - S Paquet-Fifield
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - M Germann
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - J Liu
- Department of Pathology, The University of Melbourne, Melbourne, Victoria, Australia
| | - D Cheasley
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia.,Walter and Elisa Hall Institute of Medical Research, Melbourne, Victoria, Australia
| | - S Sampurno
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - S A Stacker
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia
| | - M G Achen
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia
| | - R L Ward
- Department of Pathology, The University of Melbourne, Melbourne, Victoria, Australia
| | - P Waring
- Prince of Wales Clinical School and Lowy Cancer Research Centre, UNSW Medicine, Sydney, New South Wales, Australia
| | - T Mantamadiotis
- Prince of Wales Clinical School and Lowy Cancer Research Centre, UNSW Medicine, Sydney, New South Wales, Australia
| | - M Ernst
- Walter and Elisa Hall Institute of Medical Research, Melbourne, Victoria, Australia
| | - R G Ramsay
- Differentiation and Transcription Laboratory, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia.,Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia.,Prince of Wales Clinical School and Lowy Cancer Research Centre, UNSW Medicine, Sydney, New South Wales, Australia
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9
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Germann M, Xu H, Malaterre J, Sampurno S, Huyghe M, Cheasley D, Fre S, Ramsay RG. Tripartite interactions between Wnt signaling, Notch and Myb for stem/progenitor cell functions during intestinal tumorigenesis. Stem Cell Res 2014; 13:355-66. [PMID: 25290188 DOI: 10.1016/j.scr.2014.08.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 07/09/2014] [Accepted: 08/02/2014] [Indexed: 01/22/2023] Open
Abstract
Deletion studies confirm Wnt, Notch and Myb transcriptional pathway engagement in intestinal tumorigenesis. Nevertheless, their contrasting and combined roles when activated have not been elucidated. This is important as these pathways are not ablated but rather are aberrantly activated during carcinogenesis. Using ApcMin/+ mice as a source of organoids we documented their transition, on a clone-by-clone basis, to cyst-like spheres with constitutively activated Wnt pathway, increased self-renewal and growth and reduced differentiation. We then looked at this transition when Myb and/or Notch1 are activated. Activated Notch promoted cyst-like organoids. Conversely growth and propagation of cyst-like, but not normal organoids were Notch-independent. Activated Myb promoted normal, but not cyst-like organoids. Interestingly the Wnt, Notch and Myb pathways were all involved in regulating the expression of the intestinal stem cell (ISC) gene Lgr5 in organoids, while ISC gene and Notch target Olfm4 was dominantly repressed by Wnt. These findings parallel mouse intestinal adenoma formation where Notch promoted the initiation, but not growth, of Wnt-driven Olfm4-repressed colon tumors. Also Myb was essential for colon tumor initiation and collateral mouse pathologies. These data reveal the complex interplay and hierarchy of transcriptional networks that operate in ISCs and uncover a shift in pathway-dependencies during tumor initiation.
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Affiliation(s)
- Markus Germann
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Huiling Xu
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Cancer Department of Oncology, University of Melbourne, Australia; Department of Pathology, The University of Melbourne, Australia
| | - Jordane Malaterre
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Cancer Department of Oncology, University of Melbourne, Australia
| | - Shienny Sampurno
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Cancer Department of Oncology, University of Melbourne, Australia
| | - Mathilde Huyghe
- Institut Curie, Centre de Recherche, Paris 75248, Cedex 05, France
| | - Dane Cheasley
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Cancer Department of Oncology, University of Melbourne, Australia
| | - Silvia Fre
- Institut Curie, Centre de Recherche, Paris 75248, Cedex 05, France
| | - Robert G Ramsay
- Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia; Sir Peter MacCallum Cancer Department of Oncology, University of Melbourne, Australia; Department of Pathology, The University of Melbourne, Australia.
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10
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Li B, Flaveny CA, Giambelli C, Fei DL, Han L, Hang BI, Bai F, Pei XH, Nose V, Burlingame O, Capobianco AJ, Orton D, Lee E, Robbins DJ. Repurposing the FDA-approved pinworm drug pyrvinium as a novel chemotherapeutic agent for intestinal polyposis. PLoS One 2014; 9:e101969. [PMID: 25003333 PMCID: PMC4086981 DOI: 10.1371/journal.pone.0101969] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Accepted: 06/13/2014] [Indexed: 12/12/2022] Open
Abstract
Mutations in the WNT-pathway regulator ADENOMATOUS POLYPOSIS COLI (APC) promote aberrant activation of the WNT pathway that is responsible for APC-associated diseases such as Familial Adenomatous Polyposis (FAP) and 85% of spontaneous colorectal cancers (CRC). FAP is characterized by multiple intestinal adenomas, which inexorably result in CRC. Surprisingly, given their common occurrence, there are few effective chemotherapeutic drugs for FAP. Here we show that the FDA-approved, anti-helminthic drug Pyrvinium attenuates the growth of WNT-dependent CRC cells and does so via activation of CK1α. Furthermore, we show that Pyrvinium can function as an in vivo inhibitor of WNT-signaling and polyposis in a mouse model of FAP: APCmin mice. Oral administration of Pyrvinium, a CK1α agonist, attenuated the levels of WNT-driven biomarkers and inhibited adenoma formation in APCmin mice. Considering its well-documented safe use for treating enterobiasis in humans, our findings suggest that Pyrvinium could be repurposed for the clinical treatment of APC-associated polyposes.
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Affiliation(s)
- Bin Li
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Colin A. Flaveny
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Camilla Giambelli
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Dennis Liang Fei
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Lu Han
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Brian I. Hang
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - Feng Bai
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
| | - Xin-Hai Pei
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
- Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida, United States of America
| | - Vania Nose
- Department of Pathology, Miller School of Medicine, University of Miami, Miami, Florida, United States of America
| | - Oname Burlingame
- Department of Pathology, Jackson Health System, University of Miami, Miami, Florida, United States of America
| | - Anthony J. Capobianco
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
- Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida, United States of America
| | - Darren Orton
- Stemsynergy Therapeutics Inc., Miami, Florida, United States of America
| | - Ethan Lee
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America
| | - David J. Robbins
- Molecular Oncology Program, Department of Surgery, University of Miami, Miami, Florida, United States of America
- Sylvester Comprehensive Cancer Center, University of Miami, Miami, Florida, United States of America
- Department of Biochemistry and Molecular Biology, University of Miami, Miami, Florida, United States of America
- * E-mail:
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11
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Myb and the Regulation of Stem Cells in the Intestine and Brain: A Tale of Two Niches. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2013; 786:353-68. [DOI: 10.1007/978-94-007-6621-1_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Cheasley D, Pereira L, Lightowler S, Vincan E, Malaterre J, Ramsay RG. Myb Controls Intestinal Stem Cell Genes and Self-Renewal. Stem Cells 2011; 29:2042-50. [DOI: 10.1002/stem.761] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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13
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Clark PE, Polosukhina D, Love H, Correa H, Coffin C, Perlman EJ, de Caestecker M, Moses HL, Zent R. β-Catenin and K-RAS synergize to form primitive renal epithelial tumors with features of epithelial Wilms' tumors. THE AMERICAN JOURNAL OF PATHOLOGY 2011; 179:3045-55. [PMID: 21983638 DOI: 10.1016/j.ajpath.2011.08.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 07/27/2011] [Accepted: 08/10/2011] [Indexed: 12/19/2022]
Abstract
Wilms' tumor (WT) is the most common childhood renal cancer. Although mutations in known tumor-associated genes (WT1, WTX, and CATNB) occur only in a third of tumors, many tumors show evidence of activated β-catenin-dependent Wnt signaling, but the molecular mechanism by which this occurs is unknown. A key obstacle to understanding the pathogenesis of WT is the paucity of mouse models that recapitulate its features in humans. Herein, we describe a transgenic mouse model of primitive renal epithelial neoplasms that have high penetrance and mimic the epithelial component of human WT. Introduction of a stabilizing β-catenin mutation restricted to the kidney is sufficient to induce primitive renal epithelial tumors; however, when compounded with activation of K-RAS, the mice develop large, bilateral, metastatic, multifocal primitive renal epithelial tumors that have the histologic and staining characteristics of the epithelial component of human WT. These highly malignant tumors have increased activation of the phosphatidylinositol 3-kinase-AKT and extracellular signal-regulated kinase pathways, increased expression of total and nuclear β-catenin, and increased downstream targets of this pathway, such as c-Myc and survivin. Thus, we developed a novel mouse model in which activated K-RAS synergizes with canonical Wnt/β-catenin signaling to form metastatic primitive renal epithelial tumors that mimic the epithelial component of human WT.
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Affiliation(s)
- Peter E Clark
- Department of Urologic Surgery, Vanderbilt University Medical Center, Nashville, Tennessee 37232-2765, USA.
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14
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MYB suppresses differentiation and apoptosis of human breast cancer cells. Breast Cancer Res 2010; 12:R55. [PMID: 20659323 PMCID: PMC2949644 DOI: 10.1186/bcr2614] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2010] [Revised: 06/25/2010] [Accepted: 07/26/2010] [Indexed: 11/10/2022] Open
Abstract
INTRODUCTION MYB is highly expressed in estrogen receptor positive (ER + ve) breast tumours and tumour cell lines. We recently demonstrated that MYB is essential for the proliferation of ER + ve breast cancer cells, and have now investigated its role in mammary epithelial differentiation. METHODS MCF-7 breast cancer cells were treated with sodium butyrate, vitamin E succinate or 12-O-tetradecanoylphorbol-13-acetate to induce differentiation as measured by Nile Red staining of lipid droplets and β-casein expression. The non-tumorigenic murine mammary epithelial cell (MEC) line, HC11, was induced to differentiate with lactogenic hormones. MYB levels were manipulated by inducible lentiviral shRNA-mediated knockdown and retroviral overexpression. RESULTS We found that MYB expression decreases following chemically-induced differentiation of the human breast cancer cell line MCF-7, and hormonally-induced differentiation of a non-tumorigenic murine mammary epithelial cell (MEC) line, HC11. We also found that shRNA-mediated MYB knockdown initiated differentiation of breast cancer cells, and greatly sensitised them to the differentiative and pro-apoptotic effects of differentiation-inducing agents (DIAs). Sensitisation to the pro-apoptotic effects DIAs is mediated by decreased expression of BCL2, which we show here is a direct MYB target in breast cancer cells. Conversely, enforced expression of MYB resulted in the cells remaining in an undifferentiated state, with concomitant suppression of apoptosis, in the presence of DIAs. CONCLUSIONS Taken together, these data imply that MYB function is critical in regulating the balance between proliferation, differentiation, and apoptosis in MECs. Moreover, our findings suggest MYB may be a viable therapeutic target in breast cancer and suggest specific approaches for exploiting this possibility.
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15
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Abstract
The transcription factor MYB has a key role as a regulator of stem and progenitor cells in the bone marrow, colonic crypts and a neurogenic region of the adult brain. It is in these compartments that a deficit in MYB activity leads to severe or lethal phenotypes. As was predicted from its leukaemogenicity in several animal species, MYB has now been identified as an oncogene that is involved in some human leukaemias. Moreover, recent evidence has strengthened the case that MYB is activated in colon and breast cancer: a block to MYB expression is overcome by mutation of the regulatory machinery in the former disease and by oestrogen receptor-alpha (ERalpha) in the latter.
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Affiliation(s)
- Robert G Ramsay
- Peter MacCallum Cancer Centre, St Andrew's Place, Melbourne, Victoria 3002, Australia
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16
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p38MAPKδ controls c-Myb degradation in response to stress. Blood Cells Mol Dis 2008; 40:388-94. [DOI: 10.1016/j.bcmd.2007.09.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2007] [Accepted: 09/21/2007] [Indexed: 11/24/2022]
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17
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Ramsay RG, Malaterre J. Insights into c-Myb functions through investigating colonic crypts. Blood Cells Mol Dis 2007; 39:287-91. [PMID: 17659914 DOI: 10.1016/j.bcmd.2007.05.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2007] [Accepted: 05/21/2007] [Indexed: 10/23/2022]
Abstract
c-Myb has been investigated in the context of the hematopoietic system where it has been shown to regulate progenitor cell expansion and differentiation of a number of lineages. The capacity to grow and expand specific blood cell lineages in vitro using well defined growth factors plus the vast range of cell surface lineage markers that identify different cell types has driven our understanding of the spectrum of roles that c-Myb plays in this tissue compartment. In addition, c-Myb is also an important transcription factor in non-hematopoietic tissues but the restricted spectrum of cell phenotyping reagents has hampered in-depth investigation. In the case of the colonic crypt the absence of phenotyping reagents of the quality employed in identifying blood cell lineages is partly compensated for by the spatial and temporal information that is inherent in the crypt structure. Using different tools to those used in the blood system we have gained insights in the multiple roles played by c-Myb in colon epithelial cells. These observations, when combined with the understanding of c-Myb action in blood cells, is providing a clearer view as to how c-Myb operates in normal cells and how this is subverted in diseases like cancer.
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Affiliation(s)
- Robert G Ramsay
- Peter MacCallum Cancer Centre, East Melbourne and Department of Pathology, The University of Melbourne, Parkville, Australia.
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18
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Malaterre J, Carpinelli M, Ernst M, Alexander W, Cooke M, Sutton S, Dworkin S, Heath JK, Frampton J, McArthur G, Clevers H, Hilton D, Mantamadiotis T, Ramsay RG. c-Myb is required for progenitor cell homeostasis in colonic crypts. Proc Natl Acad Sci U S A 2007; 104:3829-34. [PMID: 17360438 PMCID: PMC1820669 DOI: 10.1073/pnas.0610055104] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The colonic crypt is the functional unit of the colon mucosa with a central role in ion and water reabsorption. Under steady-state conditions, the distal colonic crypt harbors a single stem cell at its base that gives rise to highly proliferative progenitor cells that differentiate into columnar, goblet, and endocrine cells. The role of c-Myb in crypt homeostasis has not been elucidated. Here we have studied three genetically distinct hypomorphic c-myb mutant mouse strains, all of which show reduced colonic crypt size. The mutations target the key domains of the transcription factor: the DNA binding, transactivation, and negative regulatory domains. In vivo proliferation and cell cycle marker studies suggest that these mice have a progenitor cell proliferation defect mediated in part by reduced Cyclin E1 expression. To independently assess the extent to which c-myb is required for colonic crypt homeostasis we also generated a novel tissue-specific mouse model to allow the deletion of c-myb in adult colon, and using these mice we show that c-Myb is required for crypt integrity, normal differentiation, and steady-state proliferation.
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Affiliation(s)
- Jordane Malaterre
- *Peter MacCallum Cancer Centre and Pathology Department, University of Melbourne, Melbourne VIC 8006, Australia
| | - Marina Carpinelli
- The Walter and Eliza Hall Institute for Medical Research, Parkville VIC 3050, Australia
| | - Matthias Ernst
- Tumour Biology Branch, Ludwig Institute for Cancer Research, Parkville VIC 3050, Australia
| | - Warren Alexander
- The Walter and Eliza Hall Institute for Medical Research, Parkville VIC 3050, Australia
| | - Michael Cooke
- Genomics Institute, Institute for Biomedical Research, San Diego, CA 92121
| | - Susan Sutton
- Genomics Institute, Institute for Biomedical Research, San Diego, CA 92121
| | - Sebastian Dworkin
- *Peter MacCallum Cancer Centre and Pathology Department, University of Melbourne, Melbourne VIC 8006, Australia
| | - Joan K. Heath
- Tumour Biology Branch, Ludwig Institute for Cancer Research, Parkville VIC 3050, Australia
| | - Jon Frampton
- Medical School, Birmingham University, Edgbaston, Birmingham B15 2TT, United Kingdom; and
| | - Grant McArthur
- *Peter MacCallum Cancer Centre and Pathology Department, University of Melbourne, Melbourne VIC 8006, Australia
| | - Hans Clevers
- Hubrecht Laboratory, 3584 CT, Utrecht, The Netherlands
| | - Douglas Hilton
- The Walter and Eliza Hall Institute for Medical Research, Parkville VIC 3050, Australia
| | - Theo Mantamadiotis
- *Peter MacCallum Cancer Centre and Pathology Department, University of Melbourne, Melbourne VIC 8006, Australia
| | - Robert G. Ramsay
- *Peter MacCallum Cancer Centre and Pathology Department, University of Melbourne, Melbourne VIC 8006, Australia
- **To whom correspondence should be addressed. E-mail:
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19
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Akare S, Jean-Louis S, Chen W, Wood DJ, Powell AA, Martinez JD. Ursodeoxycholic acid modulates histone acetylation and induces differentiation and senescence. Int J Cancer 2006; 119:2958-69. [PMID: 17019713 DOI: 10.1002/ijc.22231] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Agents that can modulate colonic environment and control dysregulated signaling are being evaluated for their chemopreventive potential in colon cancer. Ursodeoxycholate (UDCA) has shown chemopreventive potential in preclinical and animal models of colon cancer, but the mechanism behind it remains unknown. Here biological effects of UDCA were examined to understand mechanism behind its chemoprevention in colon cancer. Our data suggests that UDCA can suppress growth in a wide variety of cancer cell lines and can induce low level of apoptosis in colon cancer cells. We also found that UDCA treatment induces alteration in morphology, increased cell size, upregulation of cytokeratin 8, 18 and 19 and E-cadherin, cytokeratin remodeling and accumulation of lipid droplets, suggesting that UDCA induces differentiation in colon carcinoma cells. Our results also suggest significant differences in UDCA and sodium butyrate induced functional differentiation. We also report for the first time that UDCA can induce senescence in colon cancer cells as assessed by flattened, spread out and vacuolated morphology as well as by senescence marker beta-galactosidase staining. We also found that UDCA inhibits the telomerase activity. Surprisingly, we found that UDCA is not a histone deacytylase inhibitor but instead induces hypoacetylation of histones unlike hyperacetylation induced by sodium butyrate. Our results also suggest that, although UDCA induced senescence is p53, p21 and Rb independent, HDAC6 appears to be important in UDCA induced senescence. In summary, our data shows that UDCA modulates chromatin by inducing histone hypoacetylation and induces differentiation and senescence in colon cancer cells.
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Affiliation(s)
- Sandeep Akare
- Department of Cell Biology and Anatomy, Arizona Cancer Center, University of Arizona, Tucson, AZ 85724, USA
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20
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Hugo H, Cures A, Suraweera N, Drabsch Y, Purcell D, Mantamadiotis T, Phillips W, Dobrovic A, Zupi G, Gonda TJ, Iacopetta B, Ramsay RG. Mutations in the MYB intron I regulatory sequence increase transcription in colon cancers. Genes Chromosomes Cancer 2006; 45:1143-54. [PMID: 16977606 DOI: 10.1002/gcc.20378] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Although MYB overexpression in colorectal cancer (CRC) is known to be a prognostic indicator for poor survival, the basis for this overexpression is unclear. Among multiple levels of MYB regulation, the most dynamic is the control of transcriptional elongation by sequences within intron 1. The authors have proposed that this regulatory sequence is transcribed into an RNA stem-loop and 19-residue polyuridine tract, and is subject to mutation in CRC. When this region was examined in colorectal and breast carcinoma cell lines and tissues, the authors found frequent mutations only in CRC. It was determined that these mutations allowed increased transcription compared with the wild type sequence. These data suggest that this MYB regulatory region within intron 1 is subject to mutations in CRC but not breast cancer, perhaps consistent with the mutagenic insult that occurs within the colon and not mammary tissue. In CRC, these mutations may contribute to MYB overexpression, highlighting the importance of noncoding sequences in the regulation of key cancer genes.
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Affiliation(s)
- Honor Hugo
- Peter MacCallum Cancer Center, East Melbourne and Department of Pathology, The University of Melbourne, Australia
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