DOCSLIB.ORG

Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression Wright State University CORE Scholar Browse all Theses and Dissertations Theses and Dissertations 2010 Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression Kevin Daniel Kelley Wright State University Follow this and additional works at: https://corescholar.libraries.wright.edu/etd_all Part of the Biomedical Engineering and Bioengineering Commons Repository Citation Kelley, Kevin Daniel, "Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression" (2010). Browse all Theses and Dissertations. 1002. https://corescholar.libraries.wright.edu/etd_all/1002 This Dissertation is brought to you for free and open access by the Theses and Dissertations at CORE Scholar. It has been accepted for inclusion in Browse all Theses and Dissertations by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. UNDERSTANDING THE MOLECULAR DYNAMICS OF YPEL3 AND FHIT GENE EXPRESSION A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy By KEVIN D. KELLEY B.S., Cleveland State University, 2004 2010 Wright State University COPYRIGHT KEVIN D. KELLEY 2010 ii WRIGHT STATE UNIVERSITY SCHOOL OF GRADUATE STUDIES April 28, 2010 I HEREBY RECOMMEND THAT THE DISSERTATION PREPARED UNDER MY SUPERVISION BY Kevin D. Kelley ENTITLED Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression BE ACCEPTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF Doctor of Philosophy. Steven J. Berberich, Ph.D. Dissertation Director Gerald M. Alter, Ph.D. Director, Biomedical Sciences Ph.D. Program Andrew T. Hsu, Ph.D. Dean, School of Graduate Studies Committee on Final Examination Steven J. Berberich, Ph.D. Michael Leffak, Ph.D. Gerald M. Alter, Ph.D. Robert W. Putnam, Ph.D. Paula M. Termuhlen, M.D. iii ABSTRACT Kelley, Kevin Daniel. Ph.D., Biomedical Sciences Ph.D. Program, Wright State University, 2010. Understanding the Molecular Dynamics of YPEL3 and FHIT Gene Expression. A comprehensive understanding of the molecular signaling pathways that regulate cell growth and proliferation is essential in the realization of new therapeutic options to facilitate early detection and eradication of malignancy. Understanding the transcriptional regulation of the YPEL3 and FHIT genes forms the basis of this dissertation. YPEL3, or Yippee-like 3, is a newly identified p53 target gene that inhibits tumor cell growth and is thus itself, a novel tumor suppressor gene. FHIT, or Fragile histidine triad, is a well known tumor suppressor gene and is regulated at the transcriptional level by another growth inhibitory protein, FOXO3a, a Forkhead box transcription factor. Our laboratory has determined that YPEL3 is a direct transcriptional target of the tumor suppressor gene p53. The first section of this dissertation provides significant experimental evidence to validate this observation. Briefly, YPEL3 was shown to be upregulated downstream of p53 protein stabilization in a microarray screen that explored global gene expression modulation after RNAi-mediated reduction of p53’s negative regulators, Hdm2 and HdmX. Genotoxic stress induced iv by treatment with DNA-damaging agents resulted in stabilization of p53 protein along with elevation of YPEL3 transcript and protein levels. Moreover, there exists a cis-acting p53 response element within the YPEL3 promoter that is bound by p53 in response to this stress. YPEL3 also elicits growth inhibition and decreases in colony formation when expressed in tumor cells. It is apparent that cells which express exogenous YPEL3 are forced into a permanent cell cycle arrest, termed “premature senescence.” Similar growth suppressive phenotypes are typical of many other known p53 target genes. However, most of these genes are associated with the regulation of transient inhibition of cell division or the induction of apoptosis. YPEL3 is unique in its ability to trigger premature cellular senescence. Indeed, YPEL3 stands out among many other p53 targets because it is among the first to play a role in this process. To further understand the mechanism of YPEL3-induced senescence, the second portion of this dissertation focuses on the generation of a three-dimensional model of YPEL3’s protein structure. It was hypothesized that predicting YPEL3’s protein structure may also aid in understanding the molecular events involved in the induction and maintenance of premature senescence. Identifying structural homology between a predicted model of YPEL3 and other known structures may provide new insights into this process. This would especially be the case if homology existed between the predicted structure of YPEL3 and other proteins that have established functions in stress-responsive or senescence-associated molecular pathways. By using two independent structural prediction algorithms (Rosetta ab initio and I-TASSER), I have been able to estimate a three-dimensional model of v the YPEL3 protein which has significant structural homology to a family of Methionine oxidoreductases. These enzymes catalyze redox-mediated antioxidant reactions which dissipate intracellular reactive oxygen species (ROS) through the repair of proteins damaged by ROX-mediated methionine to methionine sulfoxide oxidation. It is even plausible that YPEL3 could be involved in the mediation of cellular senescence in response to severe oxidative stress. If this is the case, the implications of this speculation, linking the oxidative stress response to YPEL3- dependent cellular senescence, are indeed profound. YPEL3 may not only play a role in the molecular biology of cancer but also may be involved in the cellular oxidative stress response as it relates to senescence and aging. In the third part of this dissertation, FHIT, a tumor suppressor gene often deleted in epithelial-derived tumors, was also initially postulated to be regulated by p53 (just as in the case of YPEL3). However, FHIT gene expression was instead found to be modulated by FOXO3a. This gene’s expression was induced coincidentally under similar conditions as p53 such as cell cycle arrest. FHIT is suppressed by the AKT/PI3K pathway upon growth factor-dependent stimulation. These protooncogenic kinases phosphorylate and, thereby prevent FOXO3a from entering the nucleus and activating FHIT gene expression. Thus, FOXO3a is only able to enter the nucleus in the absence of mitogenic stimulation. FHIT transcript levels are elevated in response to the removal of mitogen-containing serum from breast, colon carcinoma, and immortalized mammary epithelial cells. Induction of FHIT gene expression is dependent on decreased PI3K kinase activity and subsequent reduced AKT phosphorylation which occur in the absence of growth vi factor stimulation. As such, quiescence-dependent elevation of FHIT mRNA can be elicited independently of mitogen removal, by treatment with PI3K inhibitors, or attenuated by ectopic expression of constitutively active AKT during serum deprivation. Furthermore, ectopic expression of FOXO transcription factors result in the upregulation of FHIT mRNA and protein levels. Additionally, nuclear shuttling experiments with a FOXO3a-estrogen receptor fusion protein have demonstrated that FOXO must enter the nucleus to modulate expression of FHIT. Finally, experiments using shRNA targeting FOXO3a have revealed that the modulation of FHIT gene expression, downstream of PI3K inactivation, is dependent on endogenous FOXO3a. In summary, this project began with investigating the regulation of two genes derived from a microarray screen to search for new p53 targets. Validation of YPEL3 as a novel p53 target gene was very straightforward. All assays employed in characterizing YPEL3 revealed that it behaved exactly as a classic p53 transcriptional target. The latter of the two genes, FHIT, however was determined not to be a p53 target but rather a transcriptional target of FOXO3a—another tumor suppressive transcription factor. It is the hope of the author that this information will serve to enhance our basic understanding of the paradoxically both, overwhelmingly complex and elegantly simple molecular dynamics of gene regulation, as it pertains to the biology of cancer. vii Table of Contents PART I ............................................................................................................................................. 1 INTRODUCTION TO PART 1 .......................................................................................................... 1 The p53 tumor Suppressor Gene .............................................................................................. 1 Regulation of p53 function by Mdm2 and MdmX .................................................................... 1 Target genes regulated by p53 intercede in the pathogenesis of cancer. ................................. 4 Introduction to Yippee-like 3 ....................................................................................................... 7 Clues toward understanding YPEL3’s biological function ...................................................... 7 Rationale .................................................................................................................................... 10 MATERIALS AND METHODS .................................................................................................. 11 Plasmids and Transfections ....................................................................................................... 11 RT-PCR .....................................................................................................................................
Load more

Recommended publications
  • Whole-Genome Microarray Detects Deletions and Loss of Heterozygosity of Chromosome 3 Occurring Exclusively in Metastasizing Uveal Melanoma
    Anatomy and Pathology Whole-Genome Microarray Detects Deletions and Loss of Heterozygosity of Chromosome 3 Occurring Exclusively in Metastasizing Uveal Melanoma Sarah L. Lake,1 Sarah E. Coupland,1 Azzam F. G. Taktak,2 and Bertil E. Damato3 PURPOSE. To detect deletions and loss of heterozygosity of disease is fatal in 92% of patients within 2 years of diagnosis. chromosome 3 in a rare subset of fatal, disomy 3 uveal mela- Clinical and histopathologic risk factors for UM metastasis noma (UM), undetectable by fluorescence in situ hybridization include large basal tumor diameter (LBD), ciliary body involve- (FISH). ment, epithelioid cytomorphology, extracellular matrix peri- ϩ ETHODS odic acid-Schiff-positive (PAS ) loops, and high mitotic M . Multiplex ligation-dependent probe amplification 3,4 5 (MLPA) with the P027 UM assay was performed on formalin- count. Prescher et al. showed that a nonrandom genetic fixed, paraffin-embedded (FFPE) whole tumor sections from 19 change, monosomy 3, correlates strongly with metastatic death, and the correlation has since been confirmed by several disomy 3 metastasizing UMs. Whole-genome microarray analy- 3,6–10 ses using a single-nucleotide polymorphism microarray (aSNP) groups. Consequently, fluorescence in situ hybridization were performed on frozen tissue samples from four fatal dis- (FISH) detection of chromosome 3 using a centromeric probe omy 3 metastasizing UMs and three disomy 3 tumors with Ͼ5 became routine practice for UM prognostication; however, 5% years’ metastasis-free survival. to 20% of disomy 3 UM patients unexpectedly develop metas- tases.11 Attempts have therefore been made to identify the RESULTS. Two metastasizing UMs that had been classified as minimal region(s) of deletion on chromosome 3.12–15 Despite disomy 3 by FISH analysis of a small tumor sample were found these studies, little progress has been made in defining the key on MLPA analysis to show monosomy 3.
    [Show full text]
  • Molecular Profile of Tumor-Specific CD8+ T Cell Hypofunction in a Transplantable Murine Cancer Model
    Downloaded from http://www.jimmunol.org/ by guest on September 25, 2021 T + is online at: average * The Journal of Immunology , 34 of which you can access for free at: 2016; 197:1477-1488; Prepublished online 1 July from submission to initial decision 4 weeks from acceptance to publication 2016; doi: 10.4049/jimmunol.1600589 http://www.jimmunol.org/content/197/4/1477 Molecular Profile of Tumor-Specific CD8 Cell Hypofunction in a Transplantable Murine Cancer Model Katherine A. Waugh, Sonia M. Leach, Brandon L. Moore, Tullia C. Bruno, Jonathan D. Buhrman and Jill E. Slansky J Immunol cites 95 articles Submit online. Every submission reviewed by practicing scientists ? is published twice each month by Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts http://jimmunol.org/subscription Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html http://www.jimmunol.org/content/suppl/2016/07/01/jimmunol.160058 9.DCSupplemental This article http://www.jimmunol.org/content/197/4/1477.full#ref-list-1 Information about subscribing to The JI No Triage! Fast Publication! Rapid Reviews! 30 days* Why • • • Material References Permissions Email Alerts Subscription Supplementary The Journal of Immunology The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 2016 by The American Association of Immunologists, Inc. All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. This information is current as of September 25, 2021. The Journal of Immunology Molecular Profile of Tumor-Specific CD8+ T Cell Hypofunction in a Transplantable Murine Cancer Model Katherine A.
    [Show full text]
  • Evaluation of the FHIT Gene in Colorectal Cancers1
    [CANCER RESEARCH 56, 2936-2939. July I. 1996] Advances in Brief Evaluation of the FHIT Gene in Colorectal Cancers1 Sam Thiagalingam, Nikolai A. Lisitsyn, Masaaki Hamaguchi, Michael H. Wigler, James K. V. Willson, Sanford D. Markowitz, Frederick S. Leach, Kenneth W. Kinzler, and Bert Vogelstein2 The Johns Hopkins Oncology Center. Baltimore, Maryland 21231 [S. T.. F. S. L., K. W. K., B. V.]; Department of Genetics. University of Pennsylvania, Philadelphia, Pennsylvania 9094 ¡N.A. LI: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724 ¡M.H., M. H. W.]; Department of Medicine and Ireland Cancer Center, University Hospitals of Cleveland and Case Western Resene University. Cleveland. Ohio 44106 ¡J.K. V. W., and S. D. M.¡; and Howard Hughes Medical Institute [B. V.¡,The Johns Hopkins Oncology Center, Baltimore, Maryland 21231 Abstract suppressor genes (13), the RDA results strongly supported the exist ence of a tumor suppressor gene in this area (14). A variety of studies suggests that tumor suppressor loci on chromosome Finally, Ohta et al. (15) have recently used a positional cloning 3p are important in various forms of human neoplasia. Recently, a chro approach to identify a novel gene that spanned the t(3;8) breakpoint. mosome 3pl4.2 gene called FHIT was discovered and proposed as a They named this gene FHIT (fragile histidine triad gene), reflecting its candidate tumor suppressor gene in coloréela!and other cancers. We evaluated the FHIT gene in a panel of colorectal cancer cell lines and homology to the Schizosaccharomyces pombe gene encoding Ap4A xenografts, which allowed a comprehensive mutational analysis.
    [Show full text]
  • Initial Sequencing and Comparative Analysis of the Mouse Genome
    articles Initial sequencing and comparative analysis of the mouse genome Mouse Genome Sequencing Consortium* *A list of authors and their af®liations appears at the end of the paper ........................................................................................................................................................................................................................... The sequence of the mouse genome is a key informational tool for understanding the contents of the human genome and a key experimental tool for biomedical research. Here, we report the results of an international collaboration to produce a high-quality draft sequence of the mouse genome. We also present an initial comparative analysis of the mouse and human genomes, describing some of the insights that can be gleaned from the two sequences. We discuss topics including the analysis of the evolutionary forces shaping the size, structure and sequence of the genomes; the conservation of large-scale synteny across most of the genomes; the much lower extent of sequence orthology covering less than half of the genomes; the proportions of the genomes under selection; the number of protein-coding genes; the expansion of gene families related to reproduction and immunity; the evolution of proteins; and the identi®cation of intraspecies polymorphism. With the complete sequence of the human genome nearly in hand1,2, covering about 90% of the euchromatic human genome, with about the next challenge is to extract the extraordinary trove of infor- 35% in ®nished form1. Since then, progress towards a complete mation encoded within its roughly 3 billion nucleotides. This human sequence has proceeded swiftly, with approximately 98% of information includes the blueprints for all RNAs and proteins, the genome now available in draft form and about 95% in ®nished the regulatory elements that ensure proper expression of all genes, form.
    [Show full text]
  • Large Meta-Analysis of Genome-Wide Association Studies
    medRxiv preprint doi: https://doi.org/10.1101/2020.10.01.20200659; this version posted October 4, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license . Large meta-analysis of genome-wide association studies expands knowledge of the genetic etiology of Alzheimer’s disease and highlights potential translational opportunities Céline Bellenguez1,*,#, Fahri Küçükali2,3,4*, Iris Jansen5,6*, Victor Andrade7,8*, Sonia Morenau- Grau9,10,*, Najaf Amin11,12, Benjamin Grenier-Boley1, Anne Boland13, Luca Kleineidam7,8, Peter Holmans14, Pablo Garcia9,10, Rafael Campos Martin7, Adam Naj15,16, Yang Qiong17, Joshua C. Bis18, Vincent Damotte1, Sven Van der Lee5,6,19, Marcos Costa1, Julien Chapuis1, Vilmentas Giedraitis20, María Jesús Bullido10,21, Adolfo López de Munáin10,22, Jordi Pérez- Tur10,23, Pascual Sánchez-Juan10,24, Raquel Sánchez-Valle25, Victoria Álvarez26, Pau Pastor27, Miguel Medina10,28, Jasper Van Dongen2,3,4, Christine Van Broeckhoven2,3,4, Rik Vandenberghe29,30, Sebastiaan Engelborghs31,32, Gael Nicolas33, Florence Pasquier34, Olivier Hanon35, Carole Dufouil36, Claudine Berr37, Stéphanie Debette36, Jean-François Dartigues36, Gianfranco Spalletta38, Benedetta Nacmias39,40, Vincenzo Solfrezzi41, Barbara Borroni42, Lucio Tremolizzo43, Davide Seripa44, Paolo Caffarra45, Antonio Daniele46,47, Daniela Galimberti48,49, Innocenzo Rainero50, Luisa Benussi51, Alesio Squassina52, Patrizia Mecoci53, Lucilla Parnetti54, Carlo Masullo55, Beatrice Arosio56, John Hardy57, Simon Mead58, Kevin Morgan59, Clive Holmes60, Patrick Kehoe61, Bob Woods62, EADB, Charge, ADGC, Jin Sha15,16, Yi Zhao15,63, Chien-Yueh Lee15,63, Pavel P.
    [Show full text]
  • NATURAL KILLER CELLS, HYPOXIA, and EPIGENETIC REGULATION of HEMOCHORIAL PLACENTATION by Damayanti Chakraborty Submitted to the G
    NATURAL KILLER CELLS, HYPOXIA, AND EPIGENETIC REGULATION OF HEMOCHORIAL PLACENTATION BY Damayanti Chakraborty Submitted to the graduate degree program in Pathology and Laboratory Medicine and the Graduate Faculty of the University of Kansas in partial fulfillment ofthe requirements for the degree of Doctor of Philosophy. ________________________________ Chair: Michael J. Soares, Ph.D. ________________________________ Jay Vivian, Ph.D. ________________________________ Patrick Fields, Ph.D. ________________________________ Soumen Paul, Ph.D. ________________________________ Michael Wolfe, Ph.D. ________________________________ Adam J. Krieg, Ph.D. Date Defended: 04/01/2013 The Dissertation Committee for Damayanti Chakraborty certifies that this is the approved version of the following dissertation: NATURAL KILLER CELLS, HYPOXIA, AND EPIGENETIC REGULATION OF HEMOCHORIAL PLACENTATION ________________________________ Chair: Michael J. Soares, Ph.D. Date approved: 04/01/2013 ii ABSTRACT During the establishment of pregnancy, uterine stromal cells differentiate into decidual cells and recruit natural killer (NK) cells. These NK cells are characterized by low cytotoxicity and distinct cytokine production. In rodent as well as in human pregnancy, the uterine NK cells peak in number around mid-gestation after which they decline. NK cells associate with uterine spiral arteries and are implicated in pregnancy associated vascular remodeling processes and potentially in modulating trophoblast invasion. Failure of trophoblast invasion and vascular remodeling has been shown to be associated with pathological conditions like preeclampsia syndrome, hypertension in mother and/or fetal growth restriction. We hypothesize that NK cells fundamentally contribute to the organization of the placentation site. In order to study the in vivo role of NK cells during pregnancy, gestation stage- specific NK cell depletion was performed in rats using anti asialo GM1 antibodies.
    [Show full text]
  • Associated 16P11.2 Deletion in Drosophila Melanogaster
    ARTICLE DOI: 10.1038/s41467-018-04882-6 OPEN Pervasive genetic interactions modulate neurodevelopmental defects of the autism- associated 16p11.2 deletion in Drosophila melanogaster Janani Iyer1, Mayanglambam Dhruba Singh1, Matthew Jensen1,2, Payal Patel 1, Lucilla Pizzo1, Emily Huber1, Haley Koerselman3, Alexis T. Weiner 1, Paola Lepanto4, Komal Vadodaria1, Alexis Kubina1, Qingyu Wang 1,2, Abigail Talbert1, Sneha Yennawar1, Jose Badano 4, J. Robert Manak3,5, Melissa M. Rolls1, Arjun Krishnan6,7 & 1234567890():,; Santhosh Girirajan 1,2,8 As opposed to syndromic CNVs caused by single genes, extensive phenotypic heterogeneity in variably-expressive CNVs complicates disease gene discovery and functional evaluation. Here, we propose a complex interaction model for pathogenicity of the autism-associated 16p11.2 deletion, where CNV genes interact with each other in conserved pathways to modulate expression of the phenotype. Using multiple quantitative methods in Drosophila RNAi lines, we identify a range of neurodevelopmental phenotypes for knockdown of indi- vidual 16p11.2 homologs in different tissues. We test 565 pairwise knockdowns in the developing eye, and identify 24 interactions between pairs of 16p11.2 homologs and 46 interactions between 16p11.2 homologs and neurodevelopmental genes that suppress or enhance cell proliferation phenotypes compared to one-hit knockdowns. These interac- tions within cell proliferation pathways are also enriched in a human brain-specific network, providing translational relevance in humans. Our study indicates a role for pervasive genetic interactions within CNVs towards cellular and developmental phenotypes. 1 Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA. 2 Bioinformatics and Genomics Program, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA 16802, USA.
    [Show full text]
  • Genome-Wide Profiling of Promoter Methylation in Human
    Oncogene (2006) 25, 3059–3064 & 2006 Nature Publishing Group All rights reserved 0950-9232/06 $30.00 www.nature.com/onc TECHNICAL REPORT Genome-wide profiling of promoter methylation in human I Hatada1,2, M Fukasawa1,2, M Kimura1,2, S Morita1,2, K Yamada3, T Yoshikawa3, S Yamanaka4,5, C Endo4, A Sakurada4, M Sato4, T Kondo4, A Horii5, T Ushijima6 and H Sasaki7,8 1Laboratory of Genome Science, Biosignal Genome Resource Center, Department of Molecular and Cellular Biology, Gunma University, Maebashi, Japan; 2PRESTO, Japan Science and Technology Corporation (JST), Kawaguchi, Japan; 3Laboratory for Molecular Psychiatry, RIKEN Brain Science Institute, Wako, Japan, 4Department of Thoracic Surgery, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan; 5Department of Molecular Pathology, Tohoku University School of Medicine, Sendai, Japan; 6Carcinogenesis Division, National Cancer Center Research Institute, Chuo-ku, Tokyo, Japan; 7Division of Human Genetics, Department of Integrated Genetics, National Institute of Genetics, Research Organization of Information and Systems, Mishima, Japan and 8Department of Genetics, School of Life Science, Graduate University for Advanced Studies, Mishima, Japan DNA methylation in the promoter region of a gene is Microarray-based methods of comparing differences in associated with a loss of that gene’s expression and plays DNA methylation in the genome of two samples using an important role in gene silencing. The inactivation of methylation-sensitive restriction enzymes (Yan et al., tumor-suppressor genes by aberrant methylation in the 2001; Hatada et al., 2002) have two problems. The first promoter region is well recognized in carcinogenesis. is that the microarrays contain clones from libraries of However, there has been little study in this area when it CpG islands.
    [Show full text]
  • YPEL3, a P53-Regulated Gene That Induces Cellular Senescence
    Published OnlineFirst April 13, 2010; DOI: 10.1158/0008-5472.CAN-09-3219 Molecular and Cellular Pathobiology Cancer Research YPEL3, a p53-Regulated Gene that Induces Cellular Senescence Kevin D. Kelley1, Kelly R. Miller1, Amber Todd1, Amy R. Kelley1, Rebecca Tuttle2, and Steven J. Berberich1 Abstract Cellular senescence, the limited ability of cultured normal cells to divide, can result from cellular damage triggered through oncogene activation (premature senescence) or the loss of telomeres following successive rounds of DNA replication (replicative senescence). Although both processes require a functional p53 signaling pathway, relevant downstream p53 targets have been difficult to identify. Discovery of senescence activators is important because induction of tumor cell senescence may represent a therapeutic approach for the treat- ment of cancer. In microarray studies in which p53 was reactivated in MCF7 cells, we discovered that Yippee- like-3 (YPEL3), a member of a recently discovered family of putative zinc finger motif coding genes consisting of YPEL1-5, is a p53-regulated gene. YPEL3 expression induced by DNA damage leads to p53 recruitment to a cis-acting DNA response element located near the human YPEL3 promoter. Physiologic induction of YPEL3 results in a substantial decrease in cell viability associated with an increase in cellular senescence. Through the use of RNAi and H-ras induction of cellular senescence, we show that YPEL3 activates cellular senescence downstream of p53. Consistent with its growth suppressive activity, YPEL3 gene expression is repressed in ovarian tumor samples. One mechanism of YPEL3 downregulation in ovarian tumor cell lines seems to be hypermethylation of a CpG island upstream of the YPEL3 promoter.
    [Show full text]
  • YPEL3 Antibody Cat
    YPEL3 Antibody Cat. No.: 6775 Western blot analysis of YPEL3 in A-20 cell lysate with YPEL3 antibody at 1 μg/mL in (A) the absence and (B) the presence of blocking peptide Immunocytochemistry of YPEL3 in A20 cells with YPEL3 Immunofluorescence of YPEL3 in A20 cells with YPEL3 antibody at 2.5 μg/mL. antibody at 5 μg/mL. Specifications HOST SPECIES: Rabbit SPECIES REACTIVITY: Human, Mouse, Rat HOMOLOGY: Predicted species reactivity based on immunogen sequence: Bovine: (100%) YPEL3 antibody was raised against a 15 amino acid synthetic peptide near the amino terminus of human YPEL3. IMMUNOGEN: The immunogen is located within amino acids 20 - 70 of YPEL3. TESTED APPLICATIONS: ELISA, ICC, IF, WB September 28, 2021 1 https://www.prosci-inc.com/ypel3-antibody-6775.html YPEL3 antibody can be used for detection of YPEL3 by Western blot at 1 μg/mL. Antibody can also be used for immunocytochemistry starting at 2.5 μg/mL. For immunofluorescence start at 2.5 μg/mL. APPLICATIONS: Antibody validated: Western Blot in mouse samples; Immunocytochemistry in mouse samples and Immunofluorescence in mouse samples. All other applications and species not yet tested. POSITIVE CONTROL: 1) Cat. No. 1288 - A20 Cell Lysate 2) Cat. No. 17-208 - A-20 Cell Slide Properties PURIFICATION: YPEL3 Antibody is affinity chromatography purified via peptide column. CLONALITY: Polyclonal ISOTYPE: IgG CONJUGATE: Unconjugated PHYSICAL STATE: Liquid BUFFER: YPEL3 Antibody is supplied in PBS containing 0.02% sodium azide. CONCENTRATION: 1 mg/mL YPEL3 antibody can be stored at 4˚C for three months and -20˚C, stable for up to one STORAGE CONDITIONS: year.
    [Show full text]
  • Mammalian Atypical E2fs Link Endocycle Control to Cancer
    Mammalian Atypical E2Fs Link Endocycle Control to Cancer DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Hui-Zi Chen Graduate Program in Integrated Biomedical Science Program The Ohio State University 2011 Dissertation Committee: Gustavo Leone, PhD, Advisor Michael Ostrowski, PhD Clay Marsh, MD Tsonwin Hai, PhD Kathryn Wikenheiser-Brokamp, MD PhD Copyright by Hui-Zi Chen 2011 Abstract The endocycle is a developmentally programmed variant cell cycle consisting of successive S (DNA synthesis) and G (Gap) phases without an intervening M phase or cytokinesis. As a consequence of the regulated “decoupling” of DNA replication and mitosis, which are two central processes of the traditional cell division program, endocycling cells acquire highly polyploid genomes after having undergone multiple rounds of whole genome reduplication. Although essential for metazoan development, relatively little is known about the regulation of endocycle or its physiologic role in higher vertebrates such as the mammal. A substantial body of work in the model organism Drosophila melanogaster has demonstrated an important function for dE2Fs in the control of endocycle. Genetic studies showed that both endocycle initiation and progression is severely disrupted by altering the expression of the fly E2F activator (dE2F1) or repressor (dE2F2). In mammals, the E2F family is comprised of nine structurally related proteins, encoded by eight distinct genes, that can be classified into transcriptional activators (E2f1, E2f2, E2f3a and E2f3b) or repressors (E2f4, E2f5, E2f6, E2f7 and E2f8). The repressor subclass may then be further divided into canonical (E2f4, E2f5 and E2f6) or atypical E2fs (E2f7 and E2f8).
    [Show full text]
  • Anti-FHIT Antibody (ARG58030)
    Product datasheet [email protected] ARG58030 Package: 50 μg anti-FHIT antibody Store at: -20°C Summary Product Description Rabbit Polyclonal antibody recognizes FHIT Tested Reactivity Hu Tested Application FACS, ICC/IF, IHC-P, WB Host Rabbit Clonality Polyclonal Isotype IgG Target Name FHIT Species Human Immunogen Recombinant protein corresponding to aa. 1-147 of Human FHIT. Conjugation Un-conjugated Alternate Names FRA3B; AP3Aase; Bis(5'-adenosyl)-triphosphatase; EC 3.6.1.29; AP3A hydrolase; AP3Aase; Diadenosine 5',5'''-P1,P3-triphosphate hydrolase; Dinucleosidetriphosphatase; Fragile histidine triad protein Application Instructions Application table Application Dilution FACS 1 - 3 µg/10^6 cells ICC/IF 1 - 5 µg/ml IHC-P 1 - 5 µg/ml WB 0.5 - 1 µg/ml Application Note * The dilutions indicate recommended starting dilutions and the optimal dilutions or concentrations should be determined by the scientist. Observed Size ~ 17 kDa Properties Form Liquid Purification Affinity purification with immunogen. Buffer PBS, 0.025% Sodium azide and 2.5% BSA. Preservative 0.025% Sodium azide Stabilizer 2.5% BSA Concentration 0.5 mg/ml Storage instruction For continuous use, store undiluted antibody at 2-8°C for up to a week. For long-term storage, aliquot and store at -20°C or below. Storage in frost free freezers is not recommended. Avoid repeated www.arigobio.com 1/3 freeze/thaw cycles. Suggest spin the vial prior to opening. The antibody solution should be gently mixed before use. Note For laboratory research only, not for drug, diagnostic or other use. Bioinformation Gene Symbol FHIT Gene Full Name fragile histidine triad Background This gene, a member of the histidine triad gene family, encodes a diadenosine 5',5'''-P1,P3-triphosphate hydrolase involved in purine metabolism.
    [Show full text]