DOCSLIB.ORG

Ligand-Dependent Interaction of the Glucocorticoid Receptor with P53 Enhances Their Degradation by Hdm2

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Ligand-Dependent Interaction of the Glucocorticoid Receptor with P53 Enhances Their Degradation by Hdm2 Downloaded from genesdev.cshlp.org on October 2, 2021 - Published by Cold Spring Harbor Laboratory Press Ligand-dependent interaction of the glucocorticoid receptor with p53 enhances their degradation by Hdm2 Sagar Sengupta1 and Bohdan Wasylyk2 Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, BP 163, 67404 Illkirch cedex, France The glucocorticoid receptor (GR) and the tumor supressor p53 mediate different stress responses. We have studied the mechanism of their mutual inhibition in normal endothelial cells (HUVEC) in response to hypoxia, a physiological stress, and mitomycin C, which damages DNA. Dexamethasone (Dex) stimulates the degradation of endogenous GR and p53 by the proteasome pathway in HUVEC under hypoxia and mitomycin C treatments, and also in hepatoma cells (HepG2) under normoxia. Dex inhibits the functions of p53 (apoptosis, Bax, and p21WAF1/CIP1 expression) and GR (PEPCK and G-6-Pase expression). Endogenous p53 and GR form a ligand-dependent trimeric complex with Hdm2 in the cytoplasm. Disruption of the p53–HDM2 interaction prevents Dex-induced ubiquitylation of GR and p53. The ubiquitylation of GR requires p53, the interaction of p53 with Hdm2, and E3 ligase activity of Hdm2. These results provide a mechanistic basis for GR and p53 acting as opposing forces in the decision between cell death and survival. [Key Words: Endothelial cells; hypoxia; Bax; p21WAF1/CIP1; PEPCK; G6Pase] Received March 5, 2001; revised version accepted July 26, 2001. The development of most tumors is associated with loss p53levels can also be maintained by ARF, which blocks of function of the tumor suppressor p53. Different physi- nucleo-cytoplasmic shuttling of Mdm2 (Sherr and Weber ological stress, including DNA damage and hypoxia, ac- 2000). Most studies of p53involve DNA damaging drugs tivate p53. p53 is a transcription factor that regulates and radiation. Much less is known about the physiologi- genes involved in growth arrest and apoptosis. p53is cal stress, hypoxia. Under hypoxic conditions, p53is sta- down-regulated by its target gene product Mdm2 (human bilized by mitochondria through a redox-dependent homolog Hdm2). Mdm2 forms an autoregulatory loop mechanism (Chandel et al. 2000) and by HIF-1␣ (An et al. with p53by binding to its N-terminal domain, inhibiting 1998), whereas p53induces degradation of HIF-1␣ (Ravi its transcriptional activity and increasing its degradation et al. 2000). The response to hypoxia in vivo also in- by the ubiquitin proteasome pathway (for reviews, see volves the glucocorticoid receptor (GR) (Bauer et al. Jimenez et al. 1999; Lakin and Jackson 1999; Sionov and 1999). Haupt 1999). Mdm2 is a RING finger-dependent ubiqui- GR is a member of the steroid receptor superfamily tin protein ligase for p53and itself (Argentini et al. 2000; that mediates physiological processes controlled by glu- Fang et al. 2000; Honda and Yasuda 2000). Mdm2 also cocorticoids. In the unbound state GR is located in the inhibits p53by nuclear export through a mechanism in- cytoplasm bound to chaperones. Upon ligand binding the volving either the nuclear export signal (NES) of Mdm2 chaperones dissociate, exposing the NLS that enables (Tao and Levine 1999) or the RING finger of Mdm2 and GR to enter the nucleus and regulate transcription the NES of p53(Boyd et al. 2000; Geyer et al. 2000). The (Cheung and Smith 2000). GR activates transcription by NES of p53is masked in the transcriptionally active het- binding to glucocorticoid response elements (GREs), and erodimer, but is exposed in the monomeric form of p53 represses by binding to negative and composite elements (Stommel et al. 1999). MdmX, a Mdm2 homolog that (Kellendonk et al. 1999). GR mediates stress responses, lacks a NES, stabilizes p53by retention in the nucleus and animals that overexpress GR are more resistant to (Jackson and Berberich 2000; Stad et al. 2000). Nuclear stress and endotoxic shock (Reichardt et al. 2000). Recently, evidence has been growing for cross talk be- tween the p53and GR-mediated responses to stress. p53 1 Present address: Laboratory of Human Carcinogenesis, Building 37, physically interacts with and represses the activities of Room 2C23, 37 Convent Drive, National Cancer Institute, NIH Bethesda, MD 20892, USA. GR (Sengupta et al. 2000b). Modulation of glucocorti- 2Corresponding author. coid-induced apoptosis has been linked to p53gene dos- E-MAIL [email protected]; FAX 33-3-88-65-32-01. Article and publication are at http://www.genesdev.org/cgi/doi/10.1101/ age in mice (Mori et al. 1999). Glucocorticoids prevent gad.202201. p53-induced apoptosis in immortalized human granulo- GENES & DEVELOPMENT15:2367–2380 © 2001 by Cold Spring Harbor Laboratory Press ISSN 0890-9369/01 $5.00; www.genesdev.org 2367 Downloaded from genesdev.cshlp.org on October 2, 2021 - Published by Cold Spring Harbor Laboratory Press Sengupta and Wasylyk sa cells (Sasson et al. 2001). p53and GR regulate in op- ited around threefold by endogenous GR activated with posite manners the type II hexokinase gene, whose over- Dex, but was not affected by RU486 (Fig. 1D, lanes 7–12). expression is associated with increased glucose catabo- With a constant level of CTS1, exogenous GR inhibited lism in cancer cells (Mathupala et al. 1997). Hypoxia CTS1 activity to a small extent (Fig. 1D, lanes 13–16), leads to p53activation and decreased glucose metabo- and the addition of Dex increased this inhibition (Fig. lism (Riva et al. 1998). Because little is known about the 1D, lanes 17–19). In contrast, GR, in the presence of functional interactions between the signalling pathways RU486, had little effect (Fig. 1D, lanes 20–22). Similar mediated by p53and GR under physiological conditions, results were obtained in Saos-2 cells (data not shown). we have investigated how p53and GR regulate each These results indicate that the region of p53that inter- other under hypoxia. We show that they mutually in- acts with GR in vitro is sufficient for efficient repression hibit each other’s activity by cytoplasmic sequestration by GR in vivo. in a ligand-dependent manner, which leads to increased degradation through recruitment of the E3ubiquitin li- gase Hdm2 and the proteasome pathway. Dex decreases p53 and GR levels and inhibits expression of their target genes in HepG2 cells Results Cytoplasmic p53in neuroblastoma cells is released from its complex with GR and translocates to the nucleus Dexamethasone enhances the interaction of GR following treatment with GR antagonists (Sengupta et with the core domain and NLS of p53 al. 2000b). We investigated whether cytoplasmic p53in other tumor cell types, such as HepG2 (hepatoma) We have reported previously that p53and GR interact in and SA1 (osteosarcoma) (Wasylyk et al. 1999; Lu et al. vivo (Sengupta et al. 2000b). We used in vitro GST pull- 2000), behaved similarly. Under normal growth con- down assays to determine which region of p53interacts ditions, Dex increased the amount of p53and GR in with GR (Fig. 1A, left). The GST fusion proteins were the cytoplasm of both cell lines, although some p53 produced in Escherichia coli, purified on Glutathione always remained nuclear. In contrast, RU486 signifi- Sepharose beads, and equivalent amounts of protein cantly increased the amount of nuclear p53(data not (judged by Coomassie blue staining, Fig. 1B), were used. shown). Interestingly, in HepG2 cells, Dex caused a Full-length p53interacted with GR weakly but specifi- drastic decrease in the protein levels of both p53and GR cally in the absence of ligand (Fig. 1A,C, lanes 3and 6). (Fig. 2A, lanes 1,2). This effect was blocked by the pro- This interaction was enhanced by the agonists Dexa- teasome inhibitor LLnL (Fig. 2A, lanes 3,4), suggesting methasone (Dex) or Cortisol (Cort), and inhibited by the that the decrease is due to enhanced degradation. We antagonist RU486 (Fig. 1C, lanes 2–6). These results investigated whether Dex can inhibit the expression of show that the binding of GR to p53is enhanced by ago- genes downstream from both p53(Bax, Hdm2, and nists in vitro. In the presence of ligand, GR interacted p21WAF1/CIP1) and GR (phospho enol pyruvate carboxy with both the core domain [GST–p53(76–304)] and the kinase, PEPCK; Imai et al. 1990). Dex decreased Bax and NLS [GST–p53(305–320)] of p53, and more strongly with p21WAF1/CIP1 protein levels (Fig. 2B) and promoter activ- a mutant containing both regions [GST–p53(76–320)]. ity (reporter assays; data not shown). Dex did not affect No interaction was detected between GR and either the either the level of Hdm2 protein (Fig. 2B), or the activity N-terminal [GST–p53(1–75)] or C-terminal [GST– of the promoter (reporter assay, data not shown), show- p53(321–362) and GST–p53(363–393)] domains. The mu- ing that Hdm2 expression is less sensitive than Bax or tant containing both interaction domains [GST–p53(76– p21WAF1/CIP1 to changes in p53levels. Dex decreased 320)] interacted more strongly than the full-length pro- PEPCK protein levels (Fig. 2B). These results show that tein, raising the possibility that it lacks sequences that Dex down-regulates both p53and GR protein levels and inhibit the interaction with GR. The interactions be- the expression of their downstream targets in HepG2 tween GR and deletion mutants containing the NLS cells. [GST–p53(76–320) and GST–p53(305–320)] were inhib- ited by a peptide containing the NLS (amino acids 305– 320, Pep, Fig. 1C, lanes 7–11), confirming that the GR– Dex activation of endogenous GR inhibits p53 p53NLS interaction is specific. induction by hypoxia in normal endothelial GR interacts with the central region of p53, suggesting cells (HUVEC) that it should inhibit the Chimeric Tumor Supressor, CTS1, that harbors this domain of p53linked to heter- HepG2 is a tumor cell line with undefined genetic alter- ologous activation and dimerization domains (Conseiller ations.
Load more

Recommended publications
  • Role of Mitochondrial Ribosomal Protein S18-2 in Cancerogenesis and in Regulation of Stemness and Differentiation
    From THE DEPARTMENT OF MICROBIOLOGY TUMOR AND CELL BIOLOGY (MTC) Karolinska Institutet, Stockholm, Sweden ROLE OF MITOCHONDRIAL RIBOSOMAL PROTEIN S18-2 IN CANCEROGENESIS AND IN REGULATION OF STEMNESS AND DIFFERENTIATION Muhammad Mushtaq Stockholm 2017 All previously published papers were reproduced with permission from the publisher. Published by Karolinska Institutet. Printed by E-Print AB 2017 © Muhammad Mushtaq, 2017 ISBN 978-91-7676-697-2 Role of Mitochondrial Ribosomal Protein S18-2 in Cancerogenesis and in Regulation of Stemness and Differentiation THESIS FOR DOCTORAL DEGREE (Ph.D.) By Muhammad Mushtaq Principal Supervisor: Faculty Opponent: Associate Professor Elena Kashuba Professor Pramod Kumar Srivastava Karolinska Institutet University of Connecticut Department of Microbiology Tumor and Cell Center for Immunotherapy of Cancer and Biology (MTC) Infectious Diseases Co-supervisor(s): Examination Board: Professor Sonia Lain Professor Ola Söderberg Karolinska Institutet Uppsala University Department of Microbiology Tumor and Cell Department of Immunology, Genetics and Biology (MTC) Pathology (IGP) Professor George Klein Professor Boris Zhivotovsky Karolinska Institutet Karolinska Institutet Department of Microbiology Tumor and Cell Institute of Environmental Medicine (IMM) Biology (MTC) Professor Lars-Gunnar Larsson Karolinska Institutet Department of Microbiology Tumor and Cell Biology (MTC) Dedicated to my parents ABSTRACT Mitochondria carry their own ribosomes (mitoribosomes) for the translation of mRNA encoded by mitochondrial DNA. The architecture of mitoribosomes is mainly composed of mitochondrial ribosomal proteins (MRPs), which are encoded by nuclear genomic DNA. Emerging experimental evidences reveal that several MRPs are multifunctional and they exhibit important extra-mitochondrial functions, such as involvement in apoptosis, protein biosynthesis and signal transduction. Dysregulations of the MRPs are associated with severe pathological conditions, including cancer.
    [Show full text]
  • IPS-1 Is Crucial for DAP3-Mediated Anoikis Induction by Caspase-8 Activation
    Cell Death and Differentiation (2009) 16, 1615–1621 & 2009 Macmillan Publishers Limited All rights reserved 1350-9047/09 $32.00 www.nature.com/cdd IPS-1 is crucial for DAP3-mediated anoikis induction by caspase-8 activation H-M Li1, D Fujikura1, T Harada1, J Uehara1, T Kawai2,3, S Akira2,3, JC Reed4, A Iwai1 and T Miyazaki*,1 Detachment of adherent epithelial cells from the extracellular matrix induces apoptosis, a process known as anoikis. We have shown that DAP3 is critical for anoikis induction. However, the mechanism for anoikis induction mediated by DAP3 is still unclear. Here, we show that interferon-b promoter stimulator 1 (IPS-1) binds DAP3 and induces anoikis by caspase activation. Recently, IPS-1 has been shown to be critical for antiviral immune responses, although there has been no report of its function in apoptosis induction. We show that overexpression of IPS-1 induces apoptosis by activation of caspase-3, -8, and -9. In addition, IPS-1 knockout mouse embryonic fibroblasts were shown to be resistant to anoikis. Interestingly, IPS-1 expression, recruitment of caspase-8 to IPS-1, and caspase-8 activation were induced after cell detachment. Furthermore, DAP3-mediated anoikis induction was inhibited by knockdown of IPS-1 expression. Therefore, we elucidated a novel function of IPS-1 for anoikis induction by caspase-8 activation. Cell Death and Differentiation (2009) 16, 1615–1621; doi:10.1038/cdd.2009.97; published online 31 July 2009 Apoptosis, the programmed physiological cell death, is critical induces programmed cell death, a phenomenon known as for modeling tissues and maintaining homeostasis in multi- anoikis.
    [Show full text]
  • Hnoa1 Interacts with Complex I and DAP3 and Regulates
    Supplemental Material can be found at: http://www.jbc.org/cgi/content/full/M807797200/DC1 THE JOURNAL OF BIOLOGICAL CHEMISTRY VOL. 284, NO. 8, pp. 5414–5424, February 20, 2009 © 2009 by The American Society for Biochemistry and Molecular Biology, Inc. Printed in the U.S.A. hNOA1 Interacts with Complex I and DAP3 and Regulates Mitochondrial Respiration and Apoptosis*□S Received for publication, October 9, 2008, and in revised form, December 15, 2008 Published, JBC Papers in Press, December 22, 2008, DOI 10.1074/jbc.M807797200 Tingdong Tang‡, Bin Zheng‡1, Sheng-hong Chen‡§, Anne N. Murphy¶, Krystyna Kudlicka‡, Huilin Zhou‡§, and Marilyn G. Farquhar‡2 From the Departments of ‡Cellular and Molecular Medicine and ¶Pharmacology and §Ludwig Institute for Cancer Research, University of California, San Diego, La Jolla, California 92093-0651 Mitochondria are dynamic organelles that play key roles in fusion proteins such as the dynamin like large G proteins Drp1 metabolism, energy production, and apoptosis. Coordination of and Opa1, the cell’s susceptibility to apoptotic agents (3) or these processes is essential to maintain normal cellular func- ability to generate ATP (4, 5) is altered. tions. Here we characterized hNOA1, the human homologue of Apoptosis is controlled by a diverse range of cell signals, AtNOA1 (Arabidopsis thaliana nitric oxide-associated protein which may originate either extracellularly (extrinsic inducers) Downloaded from 1), a large mitochondrial GTPase. By immunofluorescence, or intracellularly (intrinsic inducers), and mitochondria play immunoelectron microscopy, and mitochondrial subfraction- central roles in both pathways (6). The apoptotic pathways ation, endogenous hNOA1 is localized within mitochondria involve a growing list of mitochondria-associated proteins, where it is peripherally associated with the inner mitochondrial such as Bad, cytochrome c, Smac, AIF, Bcl-2, and others, most membrane facing the mitochondrial matrix.
    [Show full text]
  • Insight Into Glucocorticoid Receptor Signalling Through Interactome Model Analysis
    RESEARCH ARTICLE Insight into glucocorticoid receptor signalling through interactome model analysis Emyr Bakker1, Kun Tian1, Luciano Mutti1, Constantinos Demonacos2, Jean- Marc Schwartz2☯*, Marija Krstic-Demonacos1☯* 1 Biomedical Research Centre, School of Environment and Life Sciences, University of Salford, Salford, United Kingdom, 2 Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom ☯ These authors contributed equally to this work. * [email protected] (JMS); [email protected] (MKD) a1111111111 a1111111111 a1111111111 a1111111111 Abstract a1111111111 Glucocorticoid hormones (GCs) are used to treat a variety of diseases because of their potent anti-inflammatory effect and their ability to induce apoptosis in lymphoid malignan- cies through the glucocorticoid receptor (GR). Despite ongoing research, high glucocorticoid efficacy and widespread usage in medicine, resistance, disease relapse and toxicity remain OPEN ACCESS factors that need addressing. Understanding the mechanisms of glucocorticoid signalling Citation: Bakker E, Tian K, Mutti L, Demonacos C, and how resistance may arise is highly important towards improving therapy. To gain insight Schwartz J-M, Krstic-Demonacos M (2017) Insight into this we undertook a systems biology approach, aiming to generate a Boolean model of into glucocorticoid receptor signalling through interactome model analysis. PLoS Comput Biol 13 the glucocorticoid receptor protein interaction network that encapsulates functional relation- (11): e1005825. https://doi.org/10.1371/journal. ships between the GR, its target genes or genes that target GR, and the interactions pcbi.1005825 between the genes that interact with the GR. This model named GEB052 consists of 52 Editor: Andrey Rzhetsky, University of Chicago, nodes representing genes or proteins, the model input (GC) and model outputs (cell death UNITED STATES and inflammation), connected by 241 logical interactions of activation or inhibition.
    [Show full text]
  • DAP3 Antibody A
    C 0 2 - t DAP3 Antibody a e r o t S Orders: 877-616-CELL (2355) [email protected] Support: 877-678-TECH (8324) 2 7 Web: [email protected] 1 www.cellsignal.com 2 # 3 Trask Lane Danvers Massachusetts 01923 USA For Research Use Only. Not For Use In Diagnostic Procedures. Applications: Reactivity: Sensitivity: MW (kDa): Source: UniProt ID: Entrez-Gene Id: WB H Endogenous 46 Rabbit P51398 7818 Product Usage Information 5. Imataka, H. et al. (1997) EMBO J 16, 817-25. 6. Levy-Strumpf, N. et al. (1997) Mol Cell Biol 17, 1615-25. Application Dilution 7. Henis-Korenblit, S. et al. (2000) Mol Cell Biol 20, 496-506. Western Blotting 1:1000 Storage Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C. Do not aliquot the antibody. Specificity / Sensitivity DAP3 Antibody detects endogenous levels of total DAP3 protein. The antibody does not cross-react with other DAP family members. Species Reactivity: Human Source / Purification Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Lys58 of human DAP3. Antibodies are purified by protein A and peptide affinity chromatography. Background Death associated protein 1 (DAP1) is a 15 kDa protein that functions as a positive mediator of cell death initiated by interferon-gamma (1,2). The DAP1 protein is proline rich and possesses one SH3 binding motif, as well as several consensus protein kinase phosphorylation sites (1). The protein is localized in the cytoplasm, but the detailed mechanism of its proapoptotic function is unclear.
    [Show full text]
  • LKB1 Is Crucial for TRAIL-Mediated Apoptosis Induction in Osteosarcoma
    ANTICANCER RESEARCH 27: 761-768 (2007) LKB1 is Crucial for TRAIL-mediated Apoptosis Induction in Osteosarcoma SHINTARO TAKEDA1,2, ATSUSHI IWAI2,3, MITSUKO NAKASHIMA2, DAISUKE FUJIKURA2,3, SATOKO CHIBA2,3, HONG MEI LI3, JUN UEHARA2,3, SATOSHI KAWAGUCHI1, MITSUNORI KAYA1, SATOSHI NAGOYA1, TAKURO WADA1, JUNYING YUAN4, SYDONIA RAYTER5, ALAN ASHWORTH5, JOHN C. REED6, TOSHIHIKO YAMASHITA1, TOSHIMITSU UEDE2 and TADAAKI MIYAZAKI2,3 1Department of Orthopaedic Surgery, Sapporo Medical University School of Medicine, Sapporo; 2Division of Molecular Immunology, Institute for Genetic Medicine, Hokkaido University, Sapporo; 3Department of Bioresources, Hokkaido University Research Center for Zoonosis Control, Sapporo, 0010021, Japan; 4Department of Cell Biology, Harvard Medical School, Boston, Massachusetts, 02115, U.S.A.; 5Cancer Research UK Gene Function and Regulation Group, The Breakthrough Breast Cancer Research Centre, Institute of Cancer Research, London SW3 6JB, U.K.; 6Burnham Institute for Medical Research, La Jolla, California, 92037, U.S.A. Abstract. Background: Despite improvements in Development of chemotherapy and surgery has resulted in chemotherapy and surgery in the treatment of osteosarcoma, the considerable improvement of survival rates of satisfactory results are still difficult to achieve. New therapeutic osteosarcoma patients (1), the current chemotherapeutic modalities need to be developed for the improvement of these agents still have a lot of problems to overcome, such as treatments. TRAIL (TNF-related apoptosis inducing ligand) is serious side-effects or resistance to multiple chemo- known as a selective apoptosis inducer in most tumor cells, but therapeutic agents in 20-30% of the patients (2). New not in normal cells. Therefore, TRAIL is a good candidate therapeutic modalities for these patients are driven by target for the treatment of tumors.
    [Show full text]
  • DAP3 Mouse Monoclonal Antibody [Clone ID: OTI2D4] Product Data
    OriGene Technologies, Inc. 9620 Medical Center Drive, Ste 200 Rockville, MD 20850, US Phone: +1-888-267-4436 [email protected] EU: [email protected] CN: [email protected] Product datasheet for TA802818 DAP3 Mouse Monoclonal Antibody [Clone ID: OTI2D4] Product data: Product Type: Primary Antibodies Clone Name: OTI2D4 Applications: WB Recommended Dilution: WB 1:2000 Reactivity: Human Host: Mouse Isotype: IgG1 Clonality: Monoclonal Immunogen: Human recombinant protein fragment corresponding to amino acids 161-398 of human DAP3 (NP_387506) produced in E.coli. Formulation: PBS (PH 7.3) containing 1% BSA, 50% glycerol and 0.02% sodium azide. Concentration: 1 mg/ml Purification: Purified from mouse ascites fluids or tissue culture supernatant by affinity chromatography (protein A/G) Conjugation: Unconjugated Storage: Store at -20°C as received. Stability: Stable for 12 months from date of receipt. Predicted Protein Size: 45.4 kDa Gene Name: death associated protein 3 Database Link: NP_387506 Entrez Gene 7818 Human P51398 This product is to be used for laboratory only. Not for diagnostic or therapeutic use. View online » ©2021 OriGene Technologies, Inc., 9620 Medical Center Drive, Ste 200, Rockville, MD 20850, US 1 / 2 DAP3 Mouse Monoclonal Antibody [Clone ID: OTI2D4] – TA802818 Background: Mammalian mitochondrial ribosomal proteins are encoded by nuclear genes and help in protein synthesis within the mitochondrion. Mitochondrial ribosomes (mitoribosomes) consist of a small 28S subunit and a large 39S subunit. They have an estimated 75% protein to rRNA composition compared to prokaryotic ribosomes, where this ratio is reversed. Another difference between mammalian mitoribosomes and prokaryotic ribosomes is that the latter contain a 5S rRNA.
    [Show full text]
  • Recent Insights Into the Mechanism of Glucocorticosteroid- Induced Apoptosis
    Cell Death and Differentiation (2002) 9, 6±19 ã 2002 Nature Publishing Group All rights reserved 1350-9047/02 $25.00 www.nature.com/cdd Review Recent insights into the mechanism of glucocorticosteroid- induced apoptosis CW Distelhorst*,1 apoptosis.1 But progress in understanding corticosteroid- induced apoptosis has lagged behind remarkable advances in 1 Division of Hematology/Oncology and Comprehensive Cancer Center, understanding other forms of apoptosis, such as that induced Departments of Medicine and Pharmacology, Case Western Reserve by the ligands of death receptors (e.g., Fas/CD95, tumor University School of Medicine and University Hospitals of Cleveland, necrosis factor). In part, this is because corticosteroid-induced Cleveland, Ohio, USA apoptosis is initiated by a steroid receptor-mediated change in * Corresponding author: CW Distelhorst, Division of Hematology/Oncology, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio, gene expression, but specific genes that mediate cell death in OH 44106-4937, USA. Tel: 216-368-1175; Fax: 216-368-1166; response to corticosteroid treatment have not been identified. E-mail: [email protected] Recent findings have shed light on events in the cell death pathway downstream from gene regulation, including the Received 20.7.01; revised 7.9.01; accepted 3.10.01 caspases responsible for the execution phase of cell death, Edited by G Nunez the unexpected involvement of the multicatalytic proteasome in the death process, the suppression of prosurvival transcrip- tion factors (e.g., AP-1, c-myc,NF-kB), and crosstalk between Abstract T cell receptor and cytokine signaling pathways. Moreover, Glucocorticosteroid hormones induce apoptosis in lympho- evidence that mitochondrial dysfunction lies downstream of cytes.
    [Show full text]
  • Glucocorticoid Receptor Changes Its Cellular Location with Breast Cancer Development
    Histol Histopathol (2008) 23: 77-85 Histology and http://www.hh.um.es Histopathology Cellular and Molecular Biology Glucocorticoid receptor changes its cellular location with breast cancer development Isabel Conde1, Ricardo Paniagua1, Benito Fraile1, Javier Lucio2 and Maria I. Arenas1 1Department of Cell Biology and Genetics, and 2Department of Physiology. University of Alcalá, Alcalá de Henares, Madrid. Spain Summary. Glucocorticoids play a major role in Introduction attenuation of the inflammatory response and they are useful in the primary combination chemotherapy of The hormonal regulation of breast cancer cell breast cancer, since in vitro studies have demonstrated an growth and survival is multifaceted and very complex antiproliferative effect in human breast cancer cells. In (Nass and Davidson, 1999) due to the potential for contrast, it was recently shown that glucocorticoids interaction or cross talk between the different classes of protect against apoptotic signals evoked by cytokines, hormones, especially the ability of certain hormones to cAMP, tumour suppressors, and death genes in regulate the abundance of the receptors for other mammary gland epithelia. Their actions are mediated by hormones (Traynor, 1995). Activated steroid receptors intracellular receptor (GR) that functions as a hormone- affect many genes that are involved in cellular dependent transcription factor; however, no previous metabolism and often affect the transcription of other studies have been focused on GR expression in different steroid receptors (Dickson and Lippman, 1988). One of pathologies of the human breast, and the possible these receptors is the glucocorticoid receptor (GR) relationship with that of mineralocorticoid receptor which operates on the mechanisms of cellular (MR) and COX-2.
    [Show full text]
  • Effects of the Knockdown of Death-Associated Protein 3 Expression on Cell Adhesion, Growth and Migration in Breast Cancer Cells
    ONCOLOGY REPORTS 33: 2575-2582, 2015 Effects of the knockdown of death-associated protein 3 expression on cell adhesion, growth and migration in breast cancer cells UMAR WAZIR1,2, ANDREW J. SANDERS3, AHMAD M.A. WAZIR4, LIN YE3, WEN G. JIANG3, IRINA C. STER2, ANUP K. SHARMA2 and KEFAH MOKBEL1,2 1The London Breast Institute, Princess Grace Hospital; 2Department of Breast Surgery, St. George's Hospital and Medical School, University of London, London; 3Cardiff University-Peking University Cancer Institute (CUPUCI), Cardiff University School of Medicine, Cardiff University, Cardiff, Wales, UK; 4Peshawar Medical College, Peshawar, Pakistan Received December 30, 2014; Accepted February 4, 2015 DOI: 10.3892/or.2015.3825 Abstract. The death-associated protein 3 (DAP3) is a compared to the controls. Furthermore, invasion and migra- highly conserved phosphoprotein involved in the regula- tion were significantly increased in the MDA-MB-231DAP3kd tion of autophagy. A previous clinical study by our group cells vs. the controls. The expression of caspase 9 and IPS1, suggested an association between low DAP3 expression known components of the apoptosis pathway, were signifi- and clinicopathological parameters of human breast cancer. cantly reduced in the MCF7DAP3kd cells (p=0.05 and p=0.003, In the present study, we intended to determine the role of respectively). We conclude that DAP3 silencing contributes to DAP3 in cancer cell behaviour in the context of human breast breast carcinogenesis by increasing cell adhesion, migration cancer. We developed knockdown sub-lines of MCF7 and and invasion. It is possible that this may be due to the activity MDA-MB-231, and performed growth, adhesion, invasion of focal adhesion kinase further downstream of the anoikis assays and electric cell-substrate impedance sensing (ECIS) pathway.
    [Show full text]
  • And Fas-Induced Cell Death
    The EMBO Journal Vol.18 No.2 pp.353–362, 1999 Structure–function analysis of an evolutionary conserved protein, DAP3, which mediates TNF-α- and Fas-induced cell death Joseph L.Kissil, Ofer Cohen, Tal Raveh and have been studied extensively: ced-3, ced-4 and ced- Adi Kimchi1 9 (reviewed in Hengartner and Horvitz, 1994). Their mammalian homologs were identified as the caspases Department of Molecular Genetics, The Weizmann Institute of (cysteine proteases), Apaf-1 and members of the Bcl-2 Science, Rehovot 76100, Israel family, respectively. The fact that these protein families 1Corresponding author constitute the core of the apoptotic machinery in mamma- e-mail: [email protected] lian cell-death systems was subsequently established (reviewed in Peter et al., 1997). Another approach con- A novel approach to the isolation of positive mediators sisted of the isolation of proteins which are recruited to of programmed cell death, based on random inactiva- the intracellular domains of cytokine receptors belonging tion of genes by expression of anti sense RNAs, was to the tumor necrosis factor (TNF) family. The yeast two- employed to identify mediators of interferon-γ-induced hybrid system served as a major tool for the isolation of apoptosis. One of the several genes identified is DAP3, these cytoplasmic proteins that bind to the intracellular which codes for a 46 kDa protein with a potential part of TNF-α receptor (p55 TNF-R1), the Fas receptor, nucleotide-binding motif. Structure–function studies of and to each other (Yuan, 1997; Ashkenazi and Dixit, 1998; the protein indicate that the intact full-length protein Wallach et al., 1998).
    [Show full text]
  • DAP3 Antibody
    Product Datasheet DAP3 Antibody Catalog No: #31066 Package Size: #31066-1 50ul #31066-2 100ul Orders: [email protected] Support: [email protected] Description Product Name DAP3 Antibody Host Species Rabbit Clonality Polyclonal Applications ELISA WB IHC Species Reactivity Hu Specificity The antibody detects endogenous level of total DAP3 protein. Immunogen Type Recombinant protein Immunogen Description Fusion protein corresponding to a C terminal 300 amino acids of human death associated protein 3 Target Name DAP3 Other Names death associated protein 3, DAP-3, MRPS29, MRP-S29, bMRP-10 Accession No. Swiss-Prot:Q16828Gene ID:1848 Formulation Rabbit IgG in pH7.4 PBS, 0.05% NaN3, 40% Glycerol. Storage Store at -20°C/1 year Application Details Predicted MW: 46kd ELISA: 1:1000-1:5000 Western blotting: 1:200-1:1000 Immunohistochemistry: 1:5-1:20 Images Gel: 12%SDS-PAGE Lane1: 293T cell lysate Lane2: Jurkat cell lysate Lane3: Human Lymphoma tissue lysate Lysates: 30ug per lane Primary antibody: 1/300 dilution Secondary antibody: Goat anti Rabbit IgG - H&L (HRP) at 1/10000 dilution Exposure time: 20 seconds Address: 8400 Baltimore Ave., Suite 302, College Park, MD 20740, USA http://www.sabbiotech.com 1 The image on the left is immunohistochemistry of paraffin-embedded Human colon cancer tissue using 31066 (DAP3 Antibody) at dilution 1/10, on the right is treated with the fusion protein. Background This gene encodes a 28S subunit protein that also participates in apoptotic pathways which are initiated by tumor necrosis factor-alpha, Fas ligand, and gamma interferon. This protein potentially binds ATP/GTP and might be a functional partner of the mitoribosomal protein S27.
    [Show full text]