1
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Ellul P, Schembri J, Baldacchino VA, Molnar T, Resal T, Allocca MA, Furfaro F, Dal Buono, Theodoropoulou A, Fragaki M, Tsoukali E, Mantzaris GJ, Phillips F, Radford S, Moran G, Gonzalez HA, Sebastian S, Fousekis F, Christodoulou D, Snir Y, Lerner Z, Yanai H, Michalopoulos G, Tua J, Camilleri L, Papamichael K, Karmiris K, Katsanos K. Post-inflammatory polyps burden as a prognostic marker of disease-outcome in patients with inflammatory bowel disease. J Crohns Colitis 2022; 17:489-496. [PMID: 36322687 DOI: 10.1093/ecco-jcc/jjac169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Indexed: 02/08/2023]
Abstract
INTRODUCTION AND AIM Post-inflammatory polyps (PIPs) are considered as indicators of previous episodes of severe inflammation and mucosal ulceration. Inflammatory bowel disease (IBD), namely Crohn's disease (CD) and ulcerative colitis (UC), exhibit a perpetuating, relapsing, and remitting pattern and PIPs is a frequent sequela of chronicity. The aim of this study was to determine whether a high PIPs burden is associated with a more severe disease course in patients with IBD. METHODS This was a multinational, multicentre, retrospective study. IBD patients previously diagnosed with PIPs were retrieved from the endoscopic database of each centre. PIPs burden was evaluated and associated with demographic and clinical data as well as factors indicating a more unfavorable disease course. RESULTS A total of 504 IBD patients with PIPs were recruited (male: 61.9%). The mean age at IBD diagnosis was 36.9 (±16.8) years. Most patients (74.8%) were diagnosed with UC. A high PIPs burden was present in 53.4% of patients. On multivariable Cox regression analysis, high PIPs burden was independently associated with treatment escalation (HR 1.35, 95% CI 1.04-1.75; P=0.024), hospitalization (HR 1.90; 95% CI 1.24 - 2.90; P=0.003), need for surgery (HR 2.28; 95% CI 1.17-4.44, P=0.02) and younger age at diagnosis (HR 0.99, 95% CI 0.98-0,99; p=0.003). CONCLUSION PIPs burden was associated with a more severe outcome. Future prospective studies should focus on the characterisation of PIPs burden as to further risk stratify this patient cohort.
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Affiliation(s)
- P Ellul
- Division of Gastroenterology, Mater Dei hospital, Malta
| | - J Schembri
- Division of Gastroenterology, Mater Dei hospital, Malta
| | | | - T Molnar
- Department of Medicine, Szent-Györgyi Albert Medical School, University of Szeged, Hungary
| | - T Resal
- Department of Medicine, Szent-Györgyi Albert Medical School, University of Szeged, Hungary
| | - M A Allocca
- Gastroenterology and Endoscopy, IRCCS Hospital San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | - F Furfaro
- Gastroenterology and Endoscopy, IRCCS Hospital San Raffaele and University Vita-Salute San Raffaele, Milan, Italy
| | - Dal Buono
- IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy
| | - A Theodoropoulou
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - M Fragaki
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - E Tsoukali
- Department of Gastroenterology, GHA "Evangelismos-Polykliniki', Athens, Greece
| | - G J Mantzaris
- Department of Gastroenterology, GHA "Evangelismos-Polykliniki', Athens, Greece
| | - F Phillips
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | - S Radford
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | - G Moran
- Nottingham University Hospitals NHS Trust, Nottingham, England
| | | | - S Sebastian
- Hull University Teaching Hospitals, Hull, UK
| | - F Fousekis
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - D Christodoulou
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
| | - Y Snir
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - Z Lerner
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - H Yanai
- Division of Gastroenterology, Rabin Medical Center, Petah Tikva, Israel
| | - G Michalopoulos
- Gastroenterology department "Tzaneion" General Hospital of Piraeus, Greece
| | - J Tua
- Division of Gastroenterology, Mater Dei hospital, Malta
| | - L Camilleri
- Faculty of Science, University of Malta, Malta
| | - K Papamichael
- Center for Inflammatory Bowel Diseases, Division of Gastroenterology, Beth-Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts
| | - K Karmiris
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - K Katsanos
- Division of Gastroenterology, Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece
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2
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Bressan M, Henley T, Louie JD, Liu G, Christodoulou D, Bai X, Taylor J, Seidman CE, Seidman JG, Mikawa T. Dynamic Cellular Integration Drives Functional Assembly of the Heart's Pacemaker Complex. Cell Rep 2019; 23:2283-2291. [PMID: 29791840 PMCID: PMC6007983 DOI: 10.1016/j.celrep.2018.04.075] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 02/27/2018] [Accepted: 04/17/2018] [Indexed: 11/23/2022] Open
Abstract
Impulses generated by a multicellular, bioelectric signaling center termed the sinoatrial node (SAN) stimulate the rhythmic contraction of the heart. The SAN consists of a network of electrochemically oscillating pacemaker cells encased in a heterogeneous connective tissue microenvironment. Although the cellular composition of the SAN has been a point of interest for more than a century, the biological processes that drive the tissue-level assembly of the cells within the SAN are unknown. Here, we demonstrate that the SAN’s structural features result from a developmental process during which mesenchymal cells derived from a multipotent progenitor structure, the proepicardium, integrate with and surround pacemaker myocardium. This process actively remodels the forming SAN and is necessary for sustained electrogenic signal generation and propagation. Collectively, these findings provide experimental evidence for how the microenvironmental architecture of the SAN is patterned and demonstrate that proper cellular arrangement is critical for cardiac pacemaker biorhythmicity.
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Affiliation(s)
- Michael Bressan
- Department of Cell Biology and Physiology, McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
| | - Trevor Henley
- Department of Cell Biology and Physiology, McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Jonathan D Louie
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | - Gary Liu
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
| | | | - Xue Bai
- Department of Pathology, McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Joan Taylor
- Department of Pathology, McAllister Heart Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | | | - J G Seidman
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
| | - Takashi Mikawa
- Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94158, USA
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3
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Gatt K, Schembri J, Katsanos KH, Christodoulou D, Karmiris K, Kopylov U, Pontas C, Koutroubakis IE, Foteinogiannopoulou K, Fabian A, Molnar T, Zammit D, Fragaki M, Balomenos D, Zingboim N, Ben Horin S, Mantzaris GJ, Ellul P. Inflammatory Bowel Disease [IBD] and Physical Activity: A Study on the Impact of Diagnosis on the Level of Exercise Amongst Patients With IBD. J Crohns Colitis 2019; 13:686-692. [PMID: 30561568 DOI: 10.1093/ecco-jcc/jjy214] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 10/28/2018] [Accepted: 12/12/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIMS Inflammatory bowel disease [IBD] can impair patients' functional capacity with significant negative effects on their quality of life. Our aim was to determine the impact of IBD diagnosis on fitness levels and to assess the levels of engagement in physical activity and fatigue in IBD patient before and after diagnosis. METHODS A prospective multi-centre cross-sectional study was performed. Patients diagnosed with IBD in the previous 18 months were recruited. Inclusion criteria included clinical remission and/or no treatment changes within the previous 6 months. Physical exercise levels were assessed by the Godin score and fatigue levels was assessed by the functional assessment of chronic illness therapy [FACIT] score. RESULTS In total, 158 patients (100 Crohn's disease [CD]) were recruited. Mean age was 35.1 years (95% confidence interval [CI] ± 2.0). Gender distribution was approximately equal [51.3% male]. The Mean Harvey Bradshaw and Simple Clinical Colitis Activity indices were 2.25 [95% CI ± 0.40] and 1.64 [95% CI ± 0.49], respectively. The mean Godin score difference before and after IBD diagnosis was 6.94 [p = 0.002]. Patients with ulcerative colitis [UC] [41.8%] were more likely than patients with CD [23.0%] to reduce their exercise levels [p = 0.04]. FACIT scores were lower in patients who had experienced relapses [p = 0.012] and had severe disease [p = 0.011]. Approximately one-third of patients reduced their activity level following IBD diagnosis. CONCLUSIONS Patients were significantly less physically active after a diagnosis of IBD and this was more apparent in UC. Identification of the risk factors associated with loss of fitness levels would help to address the reduced patient quality of life.
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Affiliation(s)
- K Gatt
- Division of Gastroenterology, Mater Dei Hospital, Malta
| | - J Schembri
- Division of Gastroenterology, Mater Dei Hospital, Malta
| | - K H Katsanos
- Department of Gastroenterology and Hepatology, Medical School and University Hospital of Ioannina, Greece
| | - D Christodoulou
- Department of Gastroenterology and Hepatology, Medical School and University Hospital of Ioannina, Greece
| | - K Karmiris
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - U Kopylov
- Department of Gastroenterology, Sheba Medical Center, Tel Hashomer, Israel
| | - C Pontas
- Department of Gastroenterology, Evangelismos Hospital, Athens, Greece
| | - I E Koutroubakis
- Department of Gastroenterology, University Hospital Heraklion, Crete, Greece
| | | | - A Fabian
- University of Szeged, First Department of Internal Medicine, Szeged, Hungary
| | - T Molnar
- University of Szeged, First Department of Internal Medicine, Szeged, Hungary
| | - D Zammit
- Division of Gastroenterology, Mater Dei Hospital, Malta
| | - M Fragaki
- Department of Gastroenterology, Venizeleio General Hospital, Heraklion, Greece
| | - D Balomenos
- Department of Gastroenterology and Hepatology, Medical School and University Hospital of Ioannina, Greece
| | - N Zingboim
- Department of Gastroenterology, Sheba Medical Center, Tel Hashomer, Israel
| | - S Ben Horin
- Department of Gastroenterology, Sheba Medical Center, Tel Hashomer, Israel
| | - G J Mantzaris
- Department of Gastroenterology, Evangelismos Hospital, Athens, Greece
| | - P Ellul
- Division of Gastroenterology, Mater Dei Hospital, Malta
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4
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Malliaropoulos N, Kakoura L, Tsitas K, Christodoulou D, Siozos A, Malliaras P, Maffulli N. Active knee range of motion assessment in elite track and field athletes: normative values. Muscles Ligaments Tendons J 2019. [DOI: 10.32098/mltj.03.2015.11] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- N. Malliaropoulos
- National Track and Field Centre, Sports Injury Clinic, Sports Medicine Clinic of SEGAS, Thessaloniki, Greece
- Thessaloniki Sports Medicine Clinic, Thessaloniki, Greece
- Sports Medicine Clinic, Rheumatology Department, Mile End Hospital Barts and The London, London, UK
- Centre for Sports and Exercise Medicine Barts and The London School of Medicine and Dentistry, London, UK
| | - L. Kakoura
- National Track and Field Centre, Sports Injury Clinic, Sports Medicine Clinic of SEGAS, Thessaloniki, Greece
| | - K. Tsitas
- National Track and Field Centre, Sports Injury Clinic, Sports Medicine Clinic of SEGAS, Thessaloniki, Greece
| | - D. Christodoulou
- National Track and Field Centre, Sports Injury Clinic, Sports Medicine Clinic of SEGAS, Thessaloniki, Greece
- Thessaloniki Sports Medicine Clinic, Thessaloniki, Greece
| | - A. Siozos
- National Track and Field Centre, Sports Injury Clinic, Sports Medicine Clinic of SEGAS, Thessaloniki, Greece
| | - P. Malliaras
- Centre for Sports and Exercise Medicine Barts and The London School of Medicine and Dentistry, London, UK
- Department of Mechanical Engineering, Bioengineering, Massachusetts Institute of Technology, Massachusetts, USA
| | - N. Maffulli
- Centre for Sports and Exercise Medicine Barts and The London School of Medicine and Dentistry, London, UK
- Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Baronissi, Salerno, Italy
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5
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Shao D, Villet O, Zhang Z, Choi SW, Yan J, Ritterhoff J, Gu H, Djukovic D, Christodoulou D, Kolwicz SC, Raftery D, Tian R. Glucose promotes cell growth by suppressing branched-chain amino acid degradation. Nat Commun 2018; 9:2935. [PMID: 30050148 PMCID: PMC6062555 DOI: 10.1038/s41467-018-05362-7] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 06/13/2018] [Indexed: 01/13/2023] Open
Abstract
Glucose and branched-chain amino acids (BCAAs) are essential nutrients and key determinants of cell growth and stress responses. High BCAA level inhibits glucose metabolism but reciprocal regulation of BCAA metabolism by glucose has not been demonstrated. Here we show that glucose suppresses BCAA catabolism in cardiomyocytes to promote hypertrophic response. High glucose inhibits CREB stimulated KLF15 transcription resulting in downregulation of enzymes in the BCAA catabolism pathway. Accumulation of BCAA through the glucose-KLF15-BCAA degradation axis is required for the activation of mTOR signaling during the hypertrophic growth of cardiomyocytes. Restoration of KLF15 prevents cardiac hypertrophy in response to pressure overload in wildtype mice but not in mutant mice deficient of BCAA degradation gene. Thus, regulation of KLF15 transcription by glucose is critical for the glucose-BCAA circuit which controls a cascade of obligatory metabolic responses previously unrecognized for cell growth.
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Affiliation(s)
- Dan Shao
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Outi Villet
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Zhen Zhang
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Sung Won Choi
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Jie Yan
- Department of Medicine, NMR Laboratory of Physiological Chemistry, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Julia Ritterhoff
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Haiwei Gu
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Danijel Djukovic
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Danos Christodoulou
- Department of Medicine, NMR Laboratory of Physiological Chemistry, Brigham and Women's Hospital, Boston, MA, 02115, USA
| | - Stephen C Kolwicz
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
| | - Daniel Raftery
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA
- Fred Hutchinson Cancer Research Center, 1100 Fairview Ave, Seattle, WA, 98109, USA
| | - Rong Tian
- Department of Anesthesiology and Pain Medicine, Mitochondria and Metabolism Center, University of Washington, Seattle, WA, 98109, USA.
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6
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Yi T, Christodoulou D, Okazaki A, Birrer M, Iliopoulos O. Abstract LB-253: Suppression of clear cell ovarian carcinoma growth by glutaminase-1 inhibitor as single agent and in combination with PARP-1 inhibitor. Cancer Res 2018. [DOI: 10.1158/1538-7445.am2018-lb-253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Tumor hypoxia and cancer-associated mutations reprogram central carbon metabolism and enhance the dependence of cancer cells on glutamine for growth. Clear cell ovarian cancer (CCOC) is a unique epithelial ovarian cancer histotype that is less responsive to chemotherapy and has poorer prognosis than serous histotype. Whole genomic analysis identified major pathways activated in clear cell involving in hypoxic cell growth and carbohydrate metabolism, which were driven by hypoxia-inducible factors HIF1a and/or 2a. We demonstrated before that treatment of HIF-expressing cancer cells with glutaminase 1 (GLS1) inhibitor CB-839, restricts nucleotide synthesis and causes DNA replication stress, which sensitizes cells to the PARP-1 inhibitor. Herein, we observed a range of sensitivities to CB-839 treatment in vitro in CCOC cell lines, from which we selected 4 most sensitive cell lines (ES2, SMOV2, TOV21G and RMG1) and 4 most resistant cell lines (OVSAYO, KK, HAC2 and OVISE) for further study. The synergistic effect of combination treatment of CB-839 and olaparib was achieved in all eight cell lines in vitro. To identify more molecular and metabolic biomarkers of CCOC sensitivity to GLS1 inhibitors, we are currently profiling the gene expression signatures of the most sensitive and resistant CCOC cell lines by RNAseq as well as and the metabolic profile of the CCOC lines. To test the sensitivity of the ES2 cells in vivo to a GLS1 as a single agent or in combination with PARP-1 inhibitors we injected them orthotopically in nude mice. Thirty mice bearing growing ES2 derived tumors were randomly assigned into four groups: vehicle control (n=8), treatment with CB-839 (200mg/kg, gavage, twice daily, n=7), olaparib (75mg/kg, gavage, once daily, n=7) or their combination (n=8). We monitored tumor growth by serial bioluminescence imaging, animal body weight as well as animal survival. To date, after 15-day treatment, we detected a synergistic effect between the 2 agents CB-839 and olaparib in controlling ovarian tumor growth in vivo. Our work discovered a range of sensitivities of CCOC cell lines to GLS1 inhibitor and supports the therapeutic strategies of combining GLS1 inhibitor and PARP inhibitor for targeting HIF-driven CCOC.
Citation Format: Tianjin Yi, Danos Christodoulou, Arimichi Okazaki, Michael Birrer, Othon Iliopoulos. Suppression of clear cell ovarian carcinoma growth by glutaminase-1 inhibitor as single agent and in combination with PARP-1 inhibitor [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr LB-253.
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Affiliation(s)
- Tianjin Yi
- 1Massachusetts General Hospital, Boston, MA
| | | | | | - Michael Birrer
- 2The University of Alabama at Birmingham, Birmingham, AL
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7
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Sun X, Hota SK, Zhou YQ, Novak S, Miguel-Perez D, Christodoulou D, Seidman CE, Seidman JG, Gregorio CC, Henkelman RM, Rossant J, Bruneau BG. Cardiac-enriched BAF chromatin-remodeling complex subunit Baf60c regulates gene expression programs essential for heart development and function. Biol Open 2018; 7:bio029512. [PMID: 29183906 PMCID: PMC5829499 DOI: 10.1242/bio.029512] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Accepted: 11/21/2017] [Indexed: 01/01/2023] Open
Abstract
How chromatin-remodeling complexes modulate gene networks to control organ-specific properties is not well understood. For example, Baf60c (Smarcd3) encodes a cardiac-enriched subunit of the SWI/SNF-like BAF chromatin complex, but its role in heart development is not fully understood. We found that constitutive loss of Baf60c leads to embryonic cardiac hypoplasia and pronounced cardiac dysfunction. Conditional deletion of Baf60c in cardiomyocytes resulted in postnatal dilated cardiomyopathy with impaired contractile function. Baf60c regulates a gene expression program that includes genes encoding contractile proteins, modulators of sarcomere function, and cardiac metabolic genes. Many of the genes deregulated in Baf60c null embryos are targets of the MEF2/SRF co-factor Myocardin (MYOCD). In a yeast two-hybrid screen, we identified MYOCD as a BAF60c interacting factor; we showed that BAF60c and MYOCD directly and functionally interact. We conclude that Baf60c is essential for coordinating a program of gene expression that regulates the fundamental functional properties of cardiomyocytes.
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Affiliation(s)
- Xin Sun
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, ON, M5G 1X8 Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8 Canada
| | - Swetansu K Hota
- Gladstone Institutes, San Francisco, CA, 94158 USA
- Roddenberry Center for Stem Cell Biology and Medicine at Gladstone, Gladstone Institutes, San Francisco, CA 94158, USA
| | - Yu-Qing Zhou
- The Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON, M5G 1X8 Canada
| | - Stefanie Novak
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Dario Miguel-Perez
- Gladstone Institutes, San Francisco, CA, 94158 USA
- Roddenberry Center for Stem Cell Biology and Medicine at Gladstone, Gladstone Institutes, San Francisco, CA 94158, USA
| | | | - Christine E Seidman
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
- Howard Hughes Medical Institute, Brigham and Women's Hospital, Boston, MA 02115, USA
| | - J G Seidman
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
| | - Carol C Gregorio
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - R Mark Henkelman
- The Mouse Imaging Centre, The Hospital for Sick Children, Toronto, ON, M5G 1X8 Canada
- Department of Medical Biophysics, University of Toronto, Toronto, ON M5S 1A8 Canada
| | - Janet Rossant
- Program in Developmental and Stem Cell Biology, The Hospital for Sick Children, Toronto, ON, M5G 1X8 Canada
- Department of Molecular Genetics, University of Toronto, Toronto, ON M5S 1A8 Canada
| | - Benoit G Bruneau
- Gladstone Institutes, San Francisco, CA, 94158 USA
- Roddenberry Center for Stem Cell Biology and Medicine at Gladstone, Gladstone Institutes, San Francisco, CA 94158, USA
- Department of Pediatrics, University of California, San Francisco, CA 94143, USA
- Cardiovascular Research Institute, University of California, San Francisco, CA 94158, USA
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8
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Shao D, Villet O, Zhang Z, Choi SW, Yan J, Gu H, Djukovic D, Christodoulou D, Ritterhoff J, Kolwicz SC, Raftery D, Tian R. Glucose Promotes Cell Growth by Suppressing Branched-chain Amino Acid Degradation. J Mol Cell Cardiol 2017. [DOI: 10.1016/j.yjmcc.2017.07.078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Okazaki A, Gameiro PA, Christodoulou D, Laviollette L, Schneider M, Chaves F, Stemmer-Rachamimov A, Yazinski SA, Lee R, Stephanopoulos G, Zou L, Iliopoulos O. Glutaminase and poly(ADP-ribose) polymerase inhibitors suppress pyrimidine synthesis and VHL-deficient renal cancers. J Clin Invest 2017; 127:1631-1645. [PMID: 28346230 DOI: 10.1172/jci87800] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 01/26/2017] [Indexed: 02/06/2023] Open
Abstract
Many cancer-associated mutations that deregulate cellular metabolic responses to hypoxia also reprogram carbon metabolism to promote utilization of glutamine. In renal cell carcinoma (RCC), cells deficient in the von Hippel-Lindau (VHL) tumor suppressor gene use glutamine to generate citrate and lipids through reductive carboxylation (RC) of α-ketoglutarate (αKG). Glutamine can also generate aspartate, the carbon source for pyrimidine biosynthesis, and glutathione for redox balance. Here we have shown that VHL-/- RCC cells rely on RC-derived aspartate to maintain de novo pyrimidine biosynthesis. Glutaminase 1 (GLS1) inhibitors depleted pyrimidines and increased ROS in VHL-/- cells but not in VHL+/+ cells, which utilized glucose oxidation for glutamate and aspartate production. GLS1 inhibitor-induced nucleoside depletion and ROS enhancement led to DNA replication stress and activation of an intra-S phase checkpoint, and suppressed the growth of VHL-/- RCC cells. These effects were rescued by administration of glutamate, αKG, or nucleobases with N-acetylcysteine. Further, we observed that the poly(ADP-ribose) polymerase (PARP) inhibitor olaparib synergizes with GLS1 inhibitors to suppress the growth of VHL-/- cells in vitro and in vivo. This work describes a mechanism that explains the sensitivity of RCC tumor growth to GLS1 inhibitors and supports the development of therapeutic strategies for targeting VHL-deficient RCC.
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10
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Cubero Salazar IM, Axelsson A, Wakimoto H, DeLaughter D, Christodoulou D, Jiang J, Burke M, Benson C, Gorham J, Depalma S, Chen J, Mukundan S, Jerosch-Herold M, Seidman CE, Seidman JG. Abstract 302: Four-and-a-half Lim Domain Protein-1 Upregulation via an Alternate Start Site Prepares the Left Atrium for Birth. Circ Res 2015. [DOI: 10.1161/res.117.suppl_1.302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Four-and-a-half-LIM-domain protein-1 (FHL1) participates in the heart’s response to biomechanical stress during pathological states. Normally, the basal isoform,
bFhl1
, predominates in non-stressed states. In pathology, a change in start site leads to expression of the induced isoform,
iFhl1
, which is 16 amino acid residues longer than bFHL1. We have studied the expression and role of
Fhl1
during normal cardiac development. The shift from fetal to neonatal circulation signifies new stress for the heart, and provides a unique opportunity to study the role FHL1 in the setting of physiological stress. We hypothesize that selective
iFhl1
upregulation during this transitional period prepares the heart for the stress involved.
Using 5’ RNA-seq, we demonstrate that
iFhl1
was selectively upregulated by 10-fold in the left atrium by embryonic gestation day 17.5 (E17.5; p=2 x 10
-5
) but remained unchanged in the other cardiac chambers (see B). The preferential increase in expression in the left atrium was confirmed with X-gal staining of Fhl1
Lacz
mice hearts (see D, blue stain), and the selective expression of the induced isoform at the protein level was confirmed by Western blot (see C). Assessment of left atrial volume by magnetic resonance imaging in mice at 2 weeks of age showed that Fhl1-null mice have significantly larger left atria than wild-type littermates (0.63±0.10 μl vs. 0.45±0.04 μl, p=0.004).
The demonstrated selective upregulation of
iFhl1
prior to birth and the increase in left atrial volume that follows genetic ablation of
Fhl1
suggests that
Fhl1
is central in the heart’s ability to respond to physiological stress as represented by normal birth.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Ju Chen
- Univ of California San Diego, La Jolla, CA
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11
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Malliaropoulos N, Korakakis V, Christodoulou D, Padhiar N, Pyne D, Giakas G, Nauck T, Malliaras P, Lohrer H. Development of a questionnaire (FASH) to measure the severity and impact of symptoms in patients with acute hamstring injuries. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.3663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Papaefthymiou H, Athanasopoulos D, Papatheodorou G, Iatrou M, Geraga M, Christodoulou D, Kordella S, Fakiris E, Tsikouras B. Uranium and other natural radionuclides in the sediments of a Mediterranean fjord-like embayment, Amvrakikos Gulf (Ionian Sea), Greece. J Environ Radioact 2013; 122:43-54. [PMID: 23538023 DOI: 10.1016/j.jenvrad.2013.02.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 02/25/2013] [Accepted: 02/26/2013] [Indexed: 06/02/2023]
Abstract
The distribution of the natural radionuclides ((238)U, (232)Th, (226)Ra, (40)K) and the artificial (137)Cs was studied in sediment cores collected from Amvrakikos Gulf, a seasonal anoxic marine basin, using γ-ray spectrometry. The activity of radionuclides, along with the concentrations of Fe and Mn, were also studied in relation to the total organic carbon and the granulometric fractions of the sediments. The results obtained revealed higher (238)U activity concentrations in all the examined sediment samples compared to the world and Greek average values for soil. The high activity values of (238)U are attributed, besides the lattice-held fraction, to phosphate fertilizer inputs in the Gulf via major rivers and/or to alteration processes of phosphate ores located mainly in the drainage basin of the river Louros. The elevated activity values of (40)K could be attributed to the mineralogical composition of the sediments and to phosphate fertilizers containing potassium. Organic matter seems to be a more efficient sorbent for U than clay minerals and amorphous Fe and Mn-oxyhydroxides. Scanning electron microscopy, together with qualitative analysis of some smectites, reveals the occurrence of U, suggesting a limited absorption of U onto clay minerals. The applied BCR sequential extraction procedure revealed that U was found mainly in the refractory phase or associated with organic matter and to a lesser extent as surface-coating oxides, with the exception of one sediment core which is characterized by high content of fresh marine organic matter and presents high percentage of U in the exchangeable fraction.
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Affiliation(s)
- H Papaefthymiou
- Division of Inorganic, Physical and Nuclear Chemistry, Department of Chemistry, University of Patras, Rio Patras, 26500 Patras, Greece.
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13
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Zhang B, Day DS, Ho JW, Song L, Cao J, Christodoulou D, Seidman JG, Crawford GE, Park PJ, Pu WT. A dynamic H3K27ac signature identifies VEGFA-stimulated endothelial enhancers and requires EP300 activity. Genome Res 2013; 23:917-27. [PMID: 23547170 PMCID: PMC3668360 DOI: 10.1101/gr.149674.112] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Histone modifications are now well-established mediators of transcriptional programs that distinguish cell states. However, the kinetics of histone modification and their role in mediating rapid, signal-responsive gene expression changes has been little studied on a genome-wide scale. Vascular endothelial growth factor A (VEGFA), a major regulator of angiogenesis, triggers changes in transcriptional activity of human umbilical vein endothelial cells (HUVECs). Here, we used chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) to measure genome-wide changes in histone H3 acetylation at lysine 27 (H3K27ac), a marker of active enhancers, in unstimulated HUVECs and HUVECs stimulated with VEGFA for 1, 4, and 12 h. We show that sites with the greatest H3K27ac change upon stimulation were associated tightly with EP300, a histone acetyltransferase. Using the variation of H3K27ac as a novel epigenetic signature, we identified transcriptional regulatory elements that are functionally linked to angiogenesis, participate in rapid VEGFA-stimulated changes in chromatin conformation, and mediate VEGFA-induced transcriptional responses. Dynamic H3K27ac deposition and associated changes in chromatin conformation required EP300 activity instead of altered nucleosome occupancy or changes in DNase I hypersensitivity. EP300 activity was also required for a subset of dynamic H3K27ac sites to loop into proximity of promoters. Our study identified thousands of endothelial, VEGFA-responsive enhancers, demonstrating that an epigenetic signature based on the variation of a chromatin feature is a productive approach to define signal-responsive genomic elements. Further, our study implicates global epigenetic modifications in rapid, signal-responsive transcriptional regulation.
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Affiliation(s)
- Bing Zhang
- Department of Cardiology, Boston Children's Hospital, Boston, Massachusetts 02115, USA
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14
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Chang S, Christodoulou D, Gorham J, Wakimoto H, Eminaga S, Conner D, Depalma S, Sparks L, Seidman J, Seidman C. Abstract 323: Growth Differentiation Factor-15 Is Upregulated in Profibrotic States of Dilated Cardiomyopathy and Not Hypertrophic Cardiomyopathy. Circ Res 2012. [DOI: 10.1161/res.111.suppl_1.a323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Introduction:
Dilated cardiomyopathy (DCM) and hypertrophic cardiomyopathy (HCM) are leading causes of morbidity and mortality in the adult population. Both DCM and HCM arise from structural perturbations and remodeling of the heart, and many cases have been found to result from underlying familial mutations. The signaling pathways by which these mutations lead to pathological ventricular remodeling, fibrosis, and heart failure remain unknown.
Methods:
In this study we attempt to identify molecular pathways in a DCM mouse model and compare and contrast the results with those previously observed in HCM mouse models. We use a transgenic mouse expressing an arginine-to-cysteine (R9C) mutation in phospholamban (PLN), previously identified in DCM patients. To define molecules involved in disease progression, we generated expression profiles using high-throughput sequencing and assessed genes of interest by immunostaining.
Results:
PLN
R9C/+
hearts exhibit increasing fibrosis, with proliferation of non-myocyte cells occurring throughout the disease spectrum. Losartan treatment, which effectively blocks the HCM phenotype, does not block the emergence of DCM and neither reduces fibrosis nor increases lifespan in PLN
R9C/+
mice. Growth differentiation factor-15 (GDF15) RNA and protein levels are significantly upregulated in the left ventricles of PLN
R9C/+
mice during DCM and heart failure. GDF15 is predominantly expressed in non-myocytes in WT mice, but in PLN
R9C/+
mice, is upregulated almost 25-fold in myocytes and less than 1.5-fold in non-myocytes.
Conclusion:
Both fibrosis and the proliferation of non-myocytes in PLN
R9C/+
mouse hearts increase as the DCM phenotype worsens, similar to that observed in HCM mouse models. However, losartan has no effect on the DCM phenotype suggesting that the molecular pathways of DCM and HCM may be different. This study identifies GDF15 as a signaling molecule that may play a unique role in DCM. GDF15 is upregulated in myocytes during DCM, but remains relatively unchanged in HCM. Understanding the genetic mechanisms underlying the progression of disease and fibrosis in both DCM and HCM will help us to characterize the distinct pathways of both diseases, as well as identify new, more specific targets for therapy.
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Affiliation(s)
- Stephen Chang
- Howard Hughes Med Institute and Harvard Med Sch, Boston, MA,
| | | | | | | | | | | | | | | | | | - Christine Seidman
- Brigham and Women's Hosp, Howard Hughes Med Institute, and Harvard Med Sch, Boston, MA
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15
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Rios X, Briggs AW, Christodoulou D, Gorham JM, Seidman JG, Church GM. Stable gene targeting in human cells using single-strand oligonucleotides with modified bases. PLoS One 2012; 7:e36697. [PMID: 22615794 PMCID: PMC3351460 DOI: 10.1371/journal.pone.0036697] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 04/09/2012] [Indexed: 11/19/2022] Open
Abstract
Recent advances allow multiplexed genome engineering in E. coli, employing easily designed oligonucleotides to edit multiple loci simultaneously. A similar technology in human cells would greatly expedite functional genomics, both by enhancing our ability to test how individual variants such as single nucleotide polymorphisms (SNPs) are related to specific phenotypes, and potentially allowing simultaneous mutation of multiple loci. However, oligo-mediated targeting of human cells is currently limited by low targeting efficiencies and low survival of modified cells. Using a HeLa-based EGFP-rescue reporter system we show that use of modified base analogs can increase targeting efficiency, in part by avoiding the mismatch repair machinery. We investigate the effects of oligonucleotide toxicity and find a strong correlation between the number of phosphorothioate bonds and toxicity. Stably EGFP-corrected cells were generated at a frequency of ~0.05% with an optimized oligonucleotide design combining modified bases and reduced number of phosphorothioate bonds. We provide evidence from comparative RNA-seq analysis suggesting cellular immunity induced by the oligonucleotides might contribute to the low viability of oligo-corrected cells. Further optimization of this method should allow rapid and scalable genome engineering in human cells.
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Affiliation(s)
- Xavier Rios
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Adrian W. Briggs
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Danos Christodoulou
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Josh M. Gorham
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Jonathan G. Seidman
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
| | - George M. Church
- Department of Genetics, Harvard Medical School, Boston, Massachusetts, United States of America
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16
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Herman DS, Lam L, Taylor MRG, Wang L, Teekakirikul P, Christodoulou D, Conner L, DePalma SR, McDonough B, Sparks E, Teodorescu DL, Cirino AL, Banner NR, Pennell DJ, Graw S, Merlo M, Di Lenarda A, Sinagra G, Bos JM, Ackerman MJ, Mitchell RN, Murry CE, Lakdawala NK, Ho CY, Barton PJR, Cook SA, Mestroni L, Seidman JG, Seidman CE. Truncations of titin causing dilated cardiomyopathy. N Engl J Med 2012; 366:619-28. [PMID: 22335739 PMCID: PMC3660031 DOI: 10.1056/nejmoa1110186] [Citation(s) in RCA: 935] [Impact Index Per Article: 77.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND Dilated cardiomyopathy and hypertrophic cardiomyopathy arise from mutations in many genes. TTN, the gene encoding the sarcomere protein titin, has been insufficiently analyzed for cardiomyopathy mutations because of its enormous size. METHODS We analyzed TTN in 312 subjects with dilated cardiomyopathy, 231 subjects with hypertrophic cardiomyopathy, and 249 controls by using next-generation or dideoxy sequencing. We evaluated deleterious variants for cosegregation in families and assessed clinical characteristics. RESULTS We identified 72 unique mutations (25 nonsense, 23 frameshift, 23 splicing, and 1 large tandem insertion) that altered full-length titin. Among subjects studied by means of next-generation sequencing, the frequency of TTN mutations was significantly higher among subjects with dilated cardiomyopathy (54 of 203 [27%]) than among subjects with hypertrophic cardiomyopathy (3 of 231 [1%], P=3×10(-16)) or controls (7 of 249 [3%], P=9×10(-14)). TTN mutations cosegregated with dilated cardiomyopathy in families (combined lod score, 11.1) with high (>95%) observed penetrance after the age of 40 years. Mutations associated with dilated cardiomyopathy were overrepresented in the titin A-band but were absent from the Z-disk and M-band regions of titin (P≤0.01 for all comparisons). Overall, the rates of cardiac outcomes were similar in subjects with and those without TTN mutations, but adverse events occurred earlier in male mutation carriers than in female carriers (P=4×10(-5)). CONCLUSIONS TTN truncating mutations are a common cause of dilated cardiomyopathy, occurring in approximately 25% of familial cases of idiopathic dilated cardiomyopathy and in 18% of sporadic cases. Incorporation of sequencing approaches that detect TTN truncations into genetic testing for dilated cardiomyopathy should substantially increase test sensitivity, thereby allowing earlier diagnosis and therapeutic intervention for many patients with dilated cardiomyopathy. Defining the functional effects of TTN truncating mutations should improve our understanding of the pathophysiology of dilated cardiomyopathy. (Funded by the Howard Hughes Medical Institute and others.).
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Affiliation(s)
- Daniel S Herman
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
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17
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Bajwa J, Owens E, Christodoulou D, Howlett D. . West J Med 2011; 343:d7488-d7488. [DOI: 10.1136/bmj.d7488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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18
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Sun X, Wylie J, Zhou Y, Christodoulou D, Seidman CE, Seidman JG, Henkelman M, Rossant J, Bruneau B. The chromatin remodeling complex subunit Baf60c regulates essential gene expression programs in heart development. Dev Biol 2011. [DOI: 10.1016/j.ydbio.2011.05.645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Chang S, Christodoulou D, Gorham JM, Wakimoto H, Sparks L, Seidman J, Seidman CE. IDENTIFYING NOVEL MOLECULAR MECHANISMS IN DILATED CARDIOMYOPATHY: INSIGHTS INTO TREATMENT AND PREVENTION. J Am Coll Cardiol 2011. [DOI: 10.1016/s0735-1097(11)60335-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Pechlivanidis H, Malliaropoulos N, Christodoulou D. Pitch side combined assessment for suspected ankle fractures. Br J Sports Med 2011. [DOI: 10.1136/bjsm.2010.081554.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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21
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Papaefthymiou H, Papatheodorou G, Christodoulou D, Geraga M, Moustakli A, Kapolos J. Elemental concentrations in sediments of the Patras Harbour, Greece, using INAA, ICP-MS and AAS. Microchem J 2010. [DOI: 10.1016/j.microc.2010.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Kapetanos D, Kokozidis G, Christodoulou D, Mistakidis K, Dimakopoulos K, Katodritou E, Kitis G, Tsianos EV. Case series of transpancreatic septotomy as precutting technique for difficult bile duct cannulation. Endoscopy 2007; 39:802-6. [PMID: 17703389 DOI: 10.1055/s-2007-966724] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND STUDY AIMS Transpancreatic septotomy can be used instead of other precut techniques to facilitate bile duct cannulation after multiple failed attempts. Within the framework of a prospective randomized study on pentoxifylline, precut cases were retrospectively analyzed. PATIENTS AND METHODS Of 320 endoscopic retrograde cholangiopancreatographies (ERCPs) in 306 patients with various indications who had a naïve papilla, 34 cases of transpancreatic septotomy were identified and compared with 15 needle-knife sphincterotomies; six patients had received both techniques for bile duct access. Complications were defined according to consensus criteria. RESULTS In the 55 patients in whom precutting techniques were employed, the use of both techniques alone or in combination resulted in a final common bile duct cannulation rate of 81.8%. Five patients developed complications (9.1%). Of the two cases of pancreatitis (3.6%), one was mild and one severe (combined group). Of the three cases with hemorrhage, one was mild (transpancreatic septotomy) and two severe (needle knife). In patients who underwent conventional pull-type sphincterotomy (n = 242), 6.2% developed complications (nine pancreatitis and six hemorrhage). CONCLUSION In cases of difficult bile duct cannulation, transpancreatic septotomy seems to be a safe alternative to needle-knife precutting with reasonable success rates. It should be studied in prospective randomized trials.
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Affiliation(s)
- D Kapetanos
- Gastroenterology Department, George Papanikolaou Hospital, Thessaloniki, Greece.
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23
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Papaefthymiou H, Papatheodorou G, Moustakli A, Christodoulou D, Geraga M. Natural radionuclides and (137)Cs distributions and their relationship with sedimentological processes in Patras Harbour, Greece. J Environ Radioact 2007; 94:55-74. [PMID: 17327137 DOI: 10.1016/j.jenvrad.2006.12.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Revised: 12/20/2006] [Accepted: 12/22/2006] [Indexed: 05/14/2023]
Abstract
Surficial and subsurficial sediment samples derived from gravity cores, selected from the harbour of Patras, Greece, were analyzed for grain size, water content, bulk density, specific gravity, organic carbon content and specific activities of natural radionuclides and (137)Cs. The specific activities of (232)Th, (226)Ra, (40)K and (137)Cs were measured radiometrically. The radionuclides (238)U and (232)Th were also analyzed using the INAA. The differences found between the specific activities of the natural radionuclides measured by the two methods are of no statistical significance. The sediment cores selection was based on a detailed bathymetric and marine seismic survey. Through the study of the detailed bathymetric map and the seismic profiles it was shown that ship traffic is highly influential to the harbour bathymetry. The granulometric and geotechnical properties of the sediments and therefore the specific activities of the natural radionuclides and (137)Cs seem to be controlled by the ship traffic. Relationship between radionuclide activity concentrations and granulometric/geotechnical parameters was defined after the treatment of all the analyses using R-mode factor analysis. The natural radionuclide activities are related to the fine fraction and bulk density of the sediments, while (137)Cs is mainly influenced by the organic carbon content. In addition, (238)U and (226)Ra seem to be in close relation with the heavy minerals fraction in coarse-grained sediments with high specific gravity.
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Affiliation(s)
- H Papaefthymiou
- Division of Physical, Inorganic and Nuclear Chemistry, Department of Chemistry, University of Patras, Patras, Greece.
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24
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25
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Abstract
AIM OF STUDY The largest population-based study for inflammatory bowel disease in Northwest Greece. MATERIALS AND METHODS A retrospective survey for the years 1982-1997. RESULTS Of 400 patients, 334 had ulcerative colitis, 43 Crohn's disease and 23 indeterminate colitis. CONCLUSIONS Crohn's disease still remains rare in Northwest Greece.
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Affiliation(s)
- E V Tsianos
- Department of Internal Medicine, School of Medicine, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece.
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26
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Christodoulou D, Kanatzidis MG, Coucouvanis D. Binucleating, macrocyclic [14]N4 ligands and their complexes. Synthesis of the free ligand 2,3-dioxo-5,6:13,14-dibenzo-9,10-(4',5'-dimethylbenzo)-1,4,8,11-tetraazacyclotetradeca-7,11-diene (L) and of the 7,12-Me2-L metal complexes and derivatives. Crystal structures and properties of the [M'][M(7,12-Me2-L)] complexes (M = Ni(II); M = Co(II); M' = ZnCl2, M = Ni(II); M' = [Na(5-crown-15)]+, M = Ni(II); M' = [(C2H5)4N]+, M = Ni(II)). Inorg Chem 2002. [DOI: 10.1021/ic00327a010] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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27
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Katsanos KH, Tsatsoulis A, Christodoulou D, Challa A, Katsaraki A, Tsianos EV. Reduced serum insulin-like growth factor-1 (IGF-1) and IGF-binding protein-3 levels in adults with inflammatory bowel disease. Growth Horm IGF Res 2001; 11:364-367. [PMID: 11914023 DOI: 10.1054/ghir.2001.0248] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In the present study, the changes in circulating IGF-1 and its binding protein IGFBP-3 were determined in adult patients with active inflammatory bowel disease (IBD) in order to assess the effect of this inflammatory condition on the IGF system. IGF-1 and IGFBP-3, as well as interleukin-6 (IL-6) were measured in serum obtained from 22 consecutive newly diagnosed patients (mean age 41.3 years) with active IBD, including 10 patients with Crohn's disease (CD), and 12 with ulcerative colitis (UC). For comparison the same parameters were determined in 30 healthy volunteers matched for age, sex and Body Mass Index (BMI). Serum IGF-1 and IGFBP-3 levels were similar in the two subgroups of patients and the values from all patients were combined for comparison with those from the control group. The mean (+/- SD) serum IGF-1 concentration (178 +/- 91 ng/ml) in the patients with IBD was lower compared with that in the controls (227 +/- 79 ng/ml, P<0.035). Similarly, the mean IGFBP-3 concentration in the patients was lower than in the controls (1.6 +/- 0.6 ng/ml vs 3.2 +/- 0.7 ng/ml respectively, P<0.001), Serum IL-6 levels were higher in the patients compared with the controls (5.5 +/- 4.2 vs 0.65 +/- 0.11 pg/ml, P<0.0001). The reduced IGF-1 and IGFBP-3 levels in patients with active IBD suggest that this systemic inflammatory condition is associated with a degree of acquired GH resistance, possibly induced by inflammatory cytokines.
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Affiliation(s)
- K H Katsanos
- Hepato-Gastroenterology Unit, School of Medicine, University of Ioannina, Ioannina, 451 10, Greece
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28
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Abstract
Although swallowing difficulties have been described in patients with Kearns-Sayre syndrome (KSS), the spectrum of manometric characteristics of dysphagia is not yet well known. Moreover, it is conceivable that a combination of various degrees of swallowing difficulties with different patterns in manometric studies exist, each playing a major role in the prognosis, natural history, and quality of life of KSS patients. An 18-year-old girl diagnosed at the age of 5 years with KSS (muscle biopsy) was admitted to our department with an upper respiratory tract infection and dysphagia. Clinical examination revealed growth retardation, external ophthalmoplegia, pigmentary retinopathy, impaired hearing, and ataxia. An electrocardiogram revealed cardiac conduction defects (long Q-T), and brain magnetic resonance imaging showed abnormalities in the cerebellar hemispheres. A manometric and motility study for dysphagia was conducted and the pharynx and upper esophageal sphincter (UES) resting pressures were similar to control group values, but the swallowing peak contraction pressure of the pharynx and the closing pressure of the UES were very low and could not promote effective peristaltic waves. Relaxation and coordination of the UES were not affected although pharyngeal and upper esophagus peristaltic waves proved to be very low and, consequently, were practically ineffective. The patient was started on treatment comprising a diet rich in potassium, magnesium, and calcium, and oral administration of vitamin D and co-enzyme Q10 100 mg daily; she was discharged 6 days later with apparent clinical improvement.
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Affiliation(s)
- K H Katsanos
- Department Hepato-Gastroenterology, Medical School, University of Ioannina, Ioannina, Greece
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29
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Keefer LK, Flippen-Anderson JL, George C, Shanklin AP, Dunams TM, Christodoulou D, Saavedra JE, Sagan ES, Bohle DS. Chemistry of the diazeniumdiolates. I. Structural and spectral characteristics of the [N(O)NO]- functional group. Nitric Oxide 2001; 5:377-94. [PMID: 11485376 DOI: 10.1006/niox.2001.0359] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ions of structure X[N(O)NO]-, examples of which have seen increasing use as probes for studying the biology of nitric oxide (NO) over the past decade, have a varied chemical history spanning nearly two centuries. Nevertheless, they have not been widely appreciated for their physicochemical similarities. Here we begin a series of systematic inquiries into the fundamental chemistry of such compounds aimed at identifying both the characteristics that justify considering them as a group and the factors that contribute to observed differences in their physicochemical properties. In the present paper, X-ray structures in which X is SO3- (1), O- (2), Ph (3), and Et2N (5), as well as that of the gem-disubstituted carbon derivative CH2[N(O)NO]2-(2) (4), are compared. All their O-N-N-O systems are essentially planar, with cis oxygens and an N-N linkage exhibiting considerable double-bond character. The ultraviolet spectrum of the isolated chromophore consists of a relatively intense ( approximately 6-10 mM(-1) x cm(-1) per [N(O)NO]- group) absorption at 248-250 nm (for 2 and 5) that is red shifted by through-space Stark interactions (e.g., by approximately 10 nm in 1 and 4) as well as by conjugative interaction with X (lambda(max) = 284 nm for 3). Infrared and Raman spectra for the widely used pharmacological probe 5 were determined, with analysis of vibrational modes being aided by comparison with the spectra of the [15N(O)15NO]- isotopomer and density functional theory calculations at the B3LYP/6-311++G** level. To address confusion that has arisen in the literature resulting from rather widespread use of differing trivial designations for this class of compounds, a unifying nomenclature system is recommended in which compounds containing the [N(O)NO]- moiety are named as diazeniumdiolates. It is hoped that these and other efforts to understand and predict the physicochemical similarities and differences among different members of the diazeniumdiolate class will aid in reaping their full potential in the area of rational drug design.
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Affiliation(s)
- L K Keefer
- Chemistry Section, Laboratory of Comparative Carcinogenesis, National Cancer Institute at Frederick, Frederick, Maryland 21702, USA.
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30
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Dalekos GN, Christodoulou D, Kistis KG, Zervou EK, Hatzis J, Tsianos EV. A prospective evaluation of dermatological side-effects during alpha-interferon therapy for chronic viral hepatitis. Eur J Gastroenterol Hepatol 1998; 10:933-9. [PMID: 9872615 DOI: 10.1097/00042737-199811000-00006] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Alpha-interferon therapy may occasionally account for immune-mediated phenomena. This study was conducted in an attempt to investigate the incidence of the development of immune-mediated dermatological diseases during alpha-interferon therapy in patients with chronic viral hepatitis. The latter has not been evaluated prospectively, whereas most of the previous studies examined small numbers of interferon treated patients or consisted of case reports. DESIGN A prospective case-control study. SETTING A tertiary referral centre. PARTICIPANTS One hundred and twenty consecutive patients with chronic viral hepatitis (67 with hepatitis B, 45 with hepatitis C, six with both hepatitis viruses, and two with delta hepatitis) were evaluated during a course of alpha-interferon therapy. In addition, 120 consecutive patients with chronic liver diseases (disease control group), who had never received alpha-interferon therapy, were evaluated during the period of the study (at least for 12 months). INTERVENTIONS Recombinant alpha-interferon at a dose of 4.5 or 5 million units subcutaneously (s.c.) three times per week for 6 to 12 months was administered to patients with hepatitis B. The patients with chronic hepatitis C were treated with 3 million units s.c. three times per week for 12 to 18 months. The patients with chronic hepatitis B and C infections received 4.5 million units for 6 months, and then 3 million units for an additional 6 to 12 months. Finally, the patients with chronic delta hepatitis received 5 million units for 1 year or more. MAIN OUTCOME MEASURES To assess prospectively the incidence of these dermatological disorders during alpha-interferon therapy and to estimate if there is any relationship between their development and the clinical, laboratory or other characteristics of the patients with chronic hepatitis. RESULTS Three to 6 months after the initiation of alpha-interferon three patients with chronic viral hepatitis (two with hepatitis C and one with hepatitis B) developed lichen planus, whereas one patient with hepatitis C developed relapsing aphthous stomatitis. The development of these disorders was significantly associated only with the presence of antinuclear antibodies before the initiation of alpha-interferon (P=0.000000). None of the patients from the disease control group had such a manifestation during the follow-up. Lichen planus resolved after the end of therapy in all of them. In contrast, therapy was discontinued in the patient who developed aphthous stomatitis, owing to the painful lesions. CONCLUSIONS This study demonstrated that alpha-interferon may rarely (3.3%) induce immune-mediated dermatological disorders, especially lichen planus. The development of these disorders may reflect a subclinical or covert autoimmune background of patients, as suggested by the presence, although in low titres, of antinuclear antibodies. However, when lichen planus developed, it was mild, did not require the discontinuation of therapy and resolved after alpha-interferon administration had ceased.
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Affiliation(s)
- G N Dalekos
- Department of Internal Medicine, Medical School, University of Ioannina, Greece
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Mitchell JB, DeGraff W, Kim S, Cook JA, Gamson J, Christodoulou D, Feelisch M, Wink DA. Redox generation of nitric oxide to radiosensitize hypoxic cells. Int J Radiat Oncol Biol Phys 1998; 42:795-8. [PMID: 9845098 DOI: 10.1016/s0360-3016(98)00327-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE Previous studies have shown that nitric oxide (NO) delivered from NO donor agents sensitizes hypoxic cells to ionizing radiation. In the present study, nitroxyl (NO-), a potential precursor to endogenous NO production, was evaluated for hypoxic cell radiosensitization, either alone or in combination with electron acceptor agents. METHODS AND MATERIALS Radiation survival curves of Chinese hamster V79 lung fibroblasts under aerobic and hypoxic conditions were assessed by clonogenic assay. Hypoxia induction was achieved by metabolism-mediated oxygen depletion in dense cell suspensions. Cells were treated with NO- produced from the nitroxyl donor Angeli's salt (AS, Na2N2O3, sodium trioxodinitrate), in the absence or presence of electron acceptor agents, ferricyanide, or tempol. NO concentrations resulting from the combination of AS and ferricyanide or tempol were measured under hypoxic conditions using an NO-sensitive electrode. RESULTS Treatment of V79 cells under hypoxic conditions with AS alone did not result in radiosensitization; however, the combination of AS with ferricyanide or tempol resulted in significant hypoxic radiosensitization with SERs of 2.5 and 2.1, respectively. Neither AS alone nor AS in combination with ferricyanide or tempol influenced aerobic radiosensitivity. The presence of NO generated under hypoxic conditions from the combination of AS with ferricyanide or tempol was confirmed using an NO-sensitive electrode. CONCLUSION Combining NO- generated from AS with electron acceptors results in NO generation and substantial hypoxic cell radiosensitization. NO- derived from donor agents or endogenously produced in tumors, combined with electron acceptors, may provide an important strategy for radiosensitizing hypoxic cells and warrants in vivo evaluation.
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Affiliation(s)
- J B Mitchell
- Radiation Biology Branch, National Cancer Institute, Bethesda, MD 20892, USA
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Dalekos GN, Achenbach K, Christodoulou D, Liapi GK, Zervou EK, Sideris DA, Tsianos EV. Idiopathic dilated cardiomyopathy: lack of association with hepatitis C virus infection. Heart 1998; 80:270-5. [PMID: 9875087 PMCID: PMC1761085 DOI: 10.1136/hrt.80.3.270] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVE To determine whether there is an association between hepatitis C virus (HCV) infection and dilated cardiomyopathy in a well defined area of north western Greece; such an association has been reported elsewhere. DESIGN Evaluation of consecutive patients with chronic HCV infection for the presence of clinical or subclinical manifestations of dilated cardiomyopathy by history, physical examination, and non-invasive laboratory procedures (ECG, chest x ray, and echocardiography) before the initiation of interferon alpha treatment; investigation for HCV infection markers in patients with dilated cardiomyopathy by enzyme and immunoblot assays (antibodies to HCV) and the reverse transcriptase polymerase chain reaction (HCV RNA). SETTING A tertiary referral centre for patients with chronic hepatitis and dilated cardiomyopathy. PATIENTS 102 patients with well defined chronic HCV infection and 55 patients with well established dilated cardiomyopathy were evaluated. MAIN OUTCOME MEASURES The need for HCV testing in patients with dilated cardiomyopathy, or follow up for heart disease in patients with chronic HCV infection. RESULTS None of the patients with chronic HCV infection had clinical or subclinical evidence of dilated cardiomyopathy from history and laboratory findings. None of the patients with dilated cardiomyopathy was positive for antibodies to HCV or viraemic on HCV RNA testing. CONCLUSIONS The study neither confirms the findings of other investigators, nor indicates a pathogenic link between HCV and dilated cardiomyopathy. For this reason, at least in Greece, testing for HCV in patients with dilated cardiomyopathy or follow up for heart disease in HCV patients appears unnecessary. Genetic or other factors could be the reason for this discrepancy if previously reported associations between HCV and dilated cardiomyopathy or hypertrophic cardiomyopathy were not coincidental.
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Affiliation(s)
- G N Dalekos
- Department of Internal Medicine, Gastroenterology, School of Medicine, University of Ioannina, Greece
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Kelman DJ, Christodoulou D, Wink DA, Keefer LK, Srinivasan A, Dipple A. Relative mutagenicities of gaseous nitrogen oxides in the supF gene of pSP189. Carcinogenesis 1997; 18:1045-8. [PMID: 9163694 DOI: 10.1093/carcin/18.5.1045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Gaseous nitric oxide (NO), an environmental pollutant found in cigarette smoke and diesel exhaust, has been shown to generate mutations in aerobic in vitro assays. The objective of this study was to identify which oxides of nitrogen, formed in the gaseous phase from NO, possess mutagenic activity. Samples of the plasmid pSP189, in 1 M HEPES buffer, pH 7.4, were exposed to preparations of nitrogen dioxide (NO2), dinitrogen trioxide (N2O3) or an air control. The gas mixtures were formed in a gas-tight syringe and were then introduced into 1 l flasks. The plasmid solution was introduced immediately afterwards. Transformation of Escherichia coli strain MBM7070 with the treated plasmids allowed analysis of mutation frequencies and the types of mutations induced in the target supF gene. The mutation frequency resulting from NO2 exposure was not different from that of the control. However, N2O3 produced a substantial number of mutations. The mutation frequency and the types of mutations were found to depend on the length of time that the gases were allowed to incubate in the syringe prior to introduction into the 1 l flasks (mutation frequency was maximal at approximately 2 min). The most prevalent mutations were AT-->GC transitions (68%), followed by GC-->AT transitions (30%), similar to previous findings when pure NO was bubbled through pSP189 solutions. These results suggest that it is N2O3, rather than NO2, that is the most likely source of mutagenic potential from gaseous nitrogen oxides.
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Affiliation(s)
- D J Kelman
- Chemistry of Carcinogenesis Laboratory, ABL-Basic Research Program, NCI-Frederick Cancer Research and Development Center, MD 21702, USA
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Wink DA, Cook JA, Christodoulou D, Krishna MC, Pacelli R, Kim S, DeGraff W, Gamson J, Vodovotz Y, Russo A, Mitchell JB. Nitric oxide and some nitric oxide donor compounds enhance the cytotoxicity of cisplatin. Nitric Oxide 1997; 1:88-94. [PMID: 9701048 DOI: 10.1006/niox.1996.0108] [Citation(s) in RCA: 107] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A major emphasis in cancer therapy research is finding mechanisms to enhance the effectiveness of clinically used chemotherapeutic agents. In this report, we show the effects of direct NO exposure or NO delivery agents such as NONOate NO donors, DEA/NO ((C2H5)2N[N(O)NO]-Na+) and PAPA/ NO (NH2(C3H6)(N[N(O)NO]C3H7)), or S-nitrosothiol NO donors (GSNO, S-nitrosoglutathione, and SNAP, S-nitroso-N-acetylpenicillamine) on the cytotoxicity of cisplatin with Chinese hamster V79 lung fibroblast cells. Cells pretreated with bolus NO or NO delivered from NONOate NO donors were markedly sensitized to subsequent cisplatin treatment, whereas S-nitrosothiol NO donors exerted little effect. The enhancement in cisplatin cytotoxicity from pretreatment with DEA/NO and PAPA/ NO persisted for approximately 180 and 240 min, respectively; thereafter cytotoxicity returned to a level consistent with cisplatin treatment alone. Pretreatment of cells with GSNO or SNAP did not enhance cisplatin cytotoxity. To discern why there were differential effects among the different NO donors, formation of NO over the time course of the experiment was assessed by the nitrosation of 2,3-diaminonaphthylene. Bolus NO, DEA/NO, and PAPA/NO produced more reactive nitrogen oxide species (RNOS) than did treatment with GSNO or SNAP. Previously reported electrochemical studies revealed that temporal NO concentrations measured from DEA/NO and PAPA/NO (1 mM) were greater than 5 microM. It appears that the flux of NO, as well as the amount of RNOS, is important in the NO-mediated enhancement of cisplatin cytotoxicity. Our results demonstrate the importance of NO delivery systems in the enhancement of cisplatin cytotoxicity and may provide insights into strategies for participation of NO donors and nitric oxide synthase with cisplatin therapy.
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Affiliation(s)
- D A Wink
- Radiation Biology Branch, National Cancer Institute, Bethesda, Maryland 20892, USA
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Mitchell JB, Cook JA, Krishna MC, DeGraff W, Gamson J, Fisher J, Christodoulou D, Wink DA. Radiation sensitisation by nitric oxide releasing agents. Br J Cancer Suppl 1996; 27:S181-4. [PMID: 8763876 PMCID: PMC2149980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Previous studies have shown that nitric oxide (NO) sensitises hypoxic cells to ionising radiation. In the present study, four different nitric oxide (NO) donor agents were evaluated for both NO release and hypoxic radiosensitisation. The S-nitrosothiol NO donor agents, S-nitrosoglutathione (GSNO) and S-nitroso-N-acetylpenicillamine (SNAP), were shown to release sustained NO concentrations (microM) and significantly radiosensitise hypoxic cells. The extent of hypoxic radiosensitisation by both of these agents at 1.0 mM concentration was similar to that obtained with molecular oxygen. In contrast, neither 3-morpholinosydnonimine (SIN-1) nor sodium nitroprusside (SNP) released detectable NO concentrations and neither agent enhanced the hypoxic radiation response to the extent of that observed for GSNO or SNAP. NO-mediated hypoxic cell radiosensitisation by NO donor drugs may offer a new approach for clinical consideration, particularly if such agents can be selectively delivered to hypoxic cells.
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Affiliation(s)
- J B Mitchell
- Radiation Biology Branch, National Cancer Institute, Bethesda, MD 20892, USA
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Cook JA, Kim SY, Teague D, Krishna MC, Pacelli R, Mitchell JB, Vodovotz Y, Nims RW, Christodoulou D, Miles AM, Grisham MB, Wink DA. Convenient colorimetric and fluorometric assays for S-nitrosothiols. Anal Biochem 1996; 238:150-8. [PMID: 8660604 DOI: 10.1006/abio.1996.0268] [Citation(s) in RCA: 141] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
S-nitrosothiols have been shown to affect a number of physiological functions. Several techniques have been used to detect these species in biological systems, primarily by methods utilizing chemiluminescence. Since the apparatus required for measurement of chemiluminescence are not readily available in most laboratories, methods employing more conventional techniques such as uv-vis and fluorescence spectroscopy may be of greater use. Herein, we report the development of colorimetric and fluorometric methods for the reliable quantitation of S-nitrosothiols. Solutions containing sulfanilamide/N-(1-naphthyl)- ethylenediamine dihydrochloride or 2,2'-azinobis (3-ethylbenzthiazoline-6-sulfonic acid), when exposed to S-nitrosoglutathione (GSNO), S-nitrosocysteine, or S-nitrosoacteylpenicillamine, resulted in no absorbance changes in the range of 400-800 nm. Exposure to HgCl2 or Cu(acetate)2 resulted in release of nitric oxide (NO) from the S-nitrosothiols. The liberated NO reacted subsequently with oxygen and formed a chemical species which reacted with either analysis solution, resulting in an increase in absorption between 400 and 800 nm. A plot of RSNO versus absorbance was linear for both mercury(II) and copper(II) ions where the slope in the presence of mercury ion was significantly greater than that for copper ion. The sensitivity was as low as 5 microM RSNO using HgCl2. The fluorometric method using 2, 3-diaminonaphthalene as the scavenger of the NOsolidusO2 products gave a sensitivity of 50 nM for GSNO. In addition, S-nitrosylated proteins were quantitated using the fluorometric technique. These methods provide accurate determination of low concentrations of S-nitrosothiols, utilizing conventional spectroscopic techniques available in most laboratories.
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Affiliation(s)
- J A Cook
- Tumor Biology Section, National Cancer Institute, Bethesda, Maryland, 20892, USA
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Nims RW, Cook JC, Krishna MC, Christodoulou D, Poore CM, Miles AM, Grisham MB, Wink DA. Colorimetric assays for nitric oxide and nitrogen oxide species formed from nitric oxide stock solutions and donor compounds. Methods Enzymol 1996; 268:93-105. [PMID: 8782576 DOI: 10.1016/s0076-6879(96)68012-4] [Citation(s) in RCA: 135] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- R W Nims
- Laboratory of Comparative Carcinogenesis, National Cancer Institute, Frederick Cancer Research and Development Center, Maryland 21702, USA
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Christodoulou D, Kudo S, Cook JA, Krishna MC, Miles A, Grisham MB, Murugesan M, Ford PC, Wink DA. Electrochemical methods for detection of nitric oxide. Methods Enzymol 1996; 268:69-83. [PMID: 8782574 DOI: 10.1016/s0076-6879(96)68010-0] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- D Christodoulou
- Laboratory of Comparative Carcinogenesis, National Cancer Institute, Frederick Cancer Research and Development Center, Maryland 21702, USA
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Christodoulou D. Severity of rheumatoid arthritis in Greek versus English patients: comment on the article by Drosos et al. Arthritis Rheum 1995; 38:1344-1345. [PMID: 7575735 DOI: 10.1002/art.1780380929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Wink DA, Nims RW, Darbyshire JF, Christodoulou D, Hanbauer I, Cox GW, Laval F, Laval J, Cook JA, Krishna MC. Reaction kinetics for nitrosation of cysteine and glutathione in aerobic nitric oxide solutions at neutral pH. Insights into the fate and physiological effects of intermediates generated in the NO/O2 reaction. Chem Res Toxicol 1994; 7:519-25. [PMID: 7981416 DOI: 10.1021/tx00040a007] [Citation(s) in RCA: 302] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The critical regulatory function of nitric oxide (NO) in many physiologic processes is well established. However, in an aerobic aqueous environment NO is known to generate one or more reactive and potentially toxic nitrogen oxide (NOx) metabolites. This has led to the speculation that mechanisms must exist in vivo by which these reactive intermediates are detoxified, although the nature of these mechanisms has yet to be elucidated. This report demonstrates that among the primary bioorganic products of the reaction of cellular constituents with the intermediates of the NO/O2 reaction are S-nitrosothiol (S-NO) adducts. Anaerobic solutions of NO are not capable of nitrosating cysteine or glutathione, while S-NO adducts of these amino acids are readily formed in the presence of O2 and NO. Investigation of the kinetics for the formation of these S-NO adducts has revealed a rate equation of d[RSNO]/dt = kSNO[NO]2[O2], where kSNO = (6 +/- 2) x 10(6) M-2S-1, a value identical to that for the formation of reactive intermediates in the autoxidation of NO. Competition studies performed with a variety of amino acids, glutathione, and azide have shown that cysteine residues have an affinity for the NOx species that is 3 orders of magnitude greater than that of the nonsulfhydryl amino acids, and > 10(6) times greater than that of the exocyclic amino groups of DNA bases. The dipeptide alanyltyrosine reacts with the intermediates of the NO/O2 reaction with an affinity 150 times less than that of the sulfhydryl-containing compounds. Furthermore, Chinese hamster V79 lung fibroblasts depleted of glutathione display enhanced cytotoxicity on exposure to NO.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D A Wink
- Chemistry Section, Frederick Cancer Research and Development Center, Maryland 21702
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Kosmopoulou I, Koliakos G, Haitoglou C, Christodoulou D, Dimitriadou A, Trakatellis A. Rat liver endoplasmic reticulum protein kinases. Int J Biochem 1994; 26:403-14. [PMID: 8187936 DOI: 10.1016/0020-711x(94)90061-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
1. Rat liver microsomal membranes were studied for the presence of protein kinases. Microsomal proteins solubilized with Triton X-100 were analyzed by means of ion exchange chromatography. 2. Protein kinase activity was detected in the column fractions using specific assays for cAMP-dependent protein kinase, cGMP-dependent protein kinase, protein kinase C, Ca2+/calmodulin-dependent protein kinase and casein kinases. 3. Fractions with protein kinase activity were further analyzed by SDS-polyacrylamide gel electrophoresis. 4. The results indicate that cAMP-dependent protein kinase type I and II, casein kinases I and II, protein kinase C proenzymes I and II and Ca2+/calmodulin kinase II are associated with the membranes of endoplasmic reticulum (ER).
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Affiliation(s)
- I Kosmopoulou
- Department of Biological Chemistry, Medical School, Aristotelian University of Thessaloniki, Greece
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Lykouras E, Malliaras D, Christodoulou GN, Moussas G, Christodoulou D, Tzonou A. Delusional depression: phenomenology and response to treatment. Psychopathology 1986; 19:157-64. [PMID: 2882542 DOI: 10.1159/000284441] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this retrospective study demographic and clinical characteristics, personality traits, family psychiatric history and response to treatment were compared in 55 delusional and 40 nondelusional hospitalized patients who met DSM-III criteria for major depression. Male delusional depressives had a greater frequency of delusional ideas at the index episode than female delusionals. Delusional depressives had a greater frequency of family history for alcoholism, a smaller frequency of previous depressive episodes and tended to respond more favorably to treatment with electroconvulsive therapy or tricyclic antidepressants combined with neuroleptics than to antidepressants alone. The findings and the implications arising from them are discussed.
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