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Crombie JL, Graff T, Falchi L, Karimi YH, Bannerji R, Nastoupil L, Thieblemont C, Ursu R, Bartlett N, Nachar V, Weiss J, Osterson J, Patel K, Brody J, Abramson JS, Lunning M, Shah NN, Ayed A, Kamdar M, Parsons B, Caimi P, Flinn I, Herrera A, Sharman J, McKenna M, Armand P, Kahl B, Smith S, Zelenetz A, Budde LE, Hutchings M, Phillips T, Dickinson M. Consensus recommendations on the management of toxicity associated with CD3×CD20 bispecific antibody therapy. Blood 2024; 143:1565-1575. [PMID: 38252906 DOI: 10.1182/blood.2023022432] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/19/2023] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
ABSTRACT Bispecific antibodies (BsAb) that target CD3 and CD20 represent a new milestone in the treatment of patients with B-cell non-Hodgkin lymphoma. These drugs have demonstrated remarkable single-agent activity in patients with heavily pretreated disease, and 3 drugs have so far received regulatory approvals in various countries. However, BsAbs can potentially lead to severe toxicity associated with T-cell activation, particularly cytokine release syndrome (CRS). The anticipated widespread use of these off-the-shelf products poses challenges for implementation and highlights the need for guidance in anticipating, mitigating, and managing adverse events. In clinical trials, guidance for the evaluation and treatment of CRS and neurotoxicity associated with BsAb therapy has been modeled after algorithms originally created for chimeric antigen receptor (CAR) T-cell therapies and other immune effector therapies, yet notable differences in timing, quality, and severity exist between the toxicities of BsAbs and CAR T-cell therapies. We therefore convened an international panel of academic and community practice physicians, advanced practitioners, registered nurses, and pharmacists with experience using CD3×CD20 BsAbs in clinical trial and off-trial settings to provide comprehensive, consensus-based recommendations specific to the assessment and management of CD3×CD20 BsAb-related toxicities.
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Affiliation(s)
| | - Tara Graff
- Mission Cancer and Blood, Des Moines, IA
| | - Lorenzo Falchi
- Lymphoma Service, Memorial Sloan Kettering Cancer Center, New York, NY
| | - Yasmin H Karimi
- Hematology Clinic, Rogel Cancer Center, University of Michigan Health System, Ann Arbor, MI
| | - Rajat Bannerji
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ
| | | | - Catherine Thieblemont
- Department of Hemato-oncology, Assistance Publique Hôpitaux de Paris, INSERM U1153, Hôpital Saint Louis, Paris, France
| | - Renata Ursu
- Department of Neurology, Assistance Publique Hôpitaux de Paris, Hôpital Saint Louis, Paris, France
| | | | - Victoria Nachar
- Hematology Clinic, Rogel Cancer Center, University of Michigan Health System, Ann Arbor, MI
| | - Jonathan Weiss
- Hematology Clinic, Rogel Cancer Center, University of Michigan Health System, Ann Arbor, MI
| | | | - Krish Patel
- Center for Blood Disorders and Cellular Therapy, Swedish Cancer Institute, Seattle, WA
| | - Joshua Brody
- Icahn School of Medicine at Mount Sinai, New York, NY
| | - Jeremy S Abramson
- Center for Lymphoma, Massachusetts General Hospital and Harvard Medical School, Boston, MA
| | - Matthew Lunning
- Division of Oncology and Hematology, University of Nebraska, Omaha, NE
| | | | - Ayed Ayed
- Cancer Specialists of North Florida, Jacksonville, FL
| | - Manali Kamdar
- Division of Hematology, Hematologic Malignancies and Stem Cell Transplantation, University of Colorado Cancer Center, Aurora, CO
| | - Benjamin Parsons
- Department of Hematology and Oncology, Gundersen Lutheran Health System, La Crosse, WI
| | - Paolo Caimi
- University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, OH
| | - Ian Flinn
- Tennessee Oncology and OneOncology, Nashville, TN
| | | | - Jeffrey Sharman
- Department of Medical Oncology, Willamette Valley Cancer Institute and Research Center/US Oncology Research, Eugene, OR
| | | | | | - Brad Kahl
- Washington University in St. Louis, St. Louis, MO
| | - Sonali Smith
- Rutgers Cancer Institute of New Jersey, New Brunswick, NJ
- Section of Hematology/Oncology, University of Chicago, Chicago, IL
| | - Andrew Zelenetz
- Lymphoma Service, Memorial Sloan Kettering Cancer Center, New York, NY
| | | | - Martin Hutchings
- Rigshospitalet and University of Copenhagen, Copenhagen, Denmark
| | - Tycel Phillips
- Hematology Clinic, Rogel Cancer Center, University of Michigan Health System, Ann Arbor, MI
| | - Michael Dickinson
- Peter MacCallum Cancer Centre and Sir Peter MacCallum Department of Oncology, University of Melbourne, Melbourne, Australia
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Ayed A, Essid R, Mankai H, Echmar A, Fares N, Hammami M, Sewald N, Limam F, Tabbene O. Synergistic antifungal activity and potential mechanism of action of a glycolipid-like compound produced by Streptomyces blastmyceticus S108 against Candida clinical isolates. J Appl Microbiol 2023; 134:lxad246. [PMID: 37884451 DOI: 10.1093/jambio/lxad246] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 09/04/2023] [Accepted: 10/25/2023] [Indexed: 10/28/2023]
Abstract
AIM The present study aimed to investigate a novel antifungal compound produced by Streptomyces blastmyceticus S108 strain. Its effectiveness against clinical isolates of Candida species and its synergistic effect with conventional antifungal drugs were assessed, and its molecular mechanism of action was further studied against Candida albicans. METHODS AND RESULTS A newly isolated strain from Tunisian soil, S. blastmyceticus S108, showed significant antifungal activity against Candida species by well diffusion method. The butanolic extract of S108 strain supernatant exhibited the best anti-Candida activity with a minimal inhibitory concentration (MIC) value of 250 μg ml-1, determined by the microdilution method. The bio-guided purification steps of the butanolic extract were performed by chromatographic techniques. Among the fractions obtained, F13 demonstrated the highest level of activity, displaying a MIC of 31.25 μg ml-1. Gas chromatography-mass spectrometry and electrospray ionization mass spectrometry analyses of this fraction (F13) revealed the glycolipidic nature of the active molecule with a molecular weight of 685.6 m/z. This antifungal metabolite remained stable to physicochemical changes and did not show hemolytic activity even at 4MIC corresponding to 125 µg ml-1 toward human erythrocytes. Besides, the glycolipid compound was combined with 5-flucytosine and showed a high synergistic effect with a fractional inhibitory concentration index value 0.14 against C. albicans ATCC 10231. This combination resulted in a decrease of MIC values of 5-flucytosine and the glycolipid-like compound by 8- and 64-fold, respectively. The examination of gene expression in treated C. albicans cells by quantitative polymerase chain reaction (qPCR) revealed that the active compound tested alone or in combination with 5-flucytosine blocks the ergosterol biosynthesis pathway by downregulating the expression of ERG1, ERG3, ERG5, ERG11, and ERG25 genes. CONCLUSION AND IMPACT OF THE STUDY The new glycolipid-like compound, produced by Streptomyces S108 isolate, could be a promising drug for medical use against pathogenic Candida isolates.
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Affiliation(s)
- A Ayed
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - R Essid
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - H Mankai
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - A Echmar
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - N Fares
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - M Hammami
- Laboratory of Aromatic and Medicinal Plants, Center of Biotechnology of Borj Cedria, Hammam-Lif 2050, Tunisia
| | - N Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - F Limam
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - O Tabbene
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
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Brahim MH, Trimech C, Ayed A, Jaballah L, Ati ZE. Une NTA cachant une NIA secondaire au syndrome de Sjogren (SJ). Nephrol Ther 2022. [DOI: 10.1016/j.nephro.2022.07.353] [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: 10/14/2022]
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Ayed A, Gati M, Hadj Brahim M, Trimech C, Jaballah L, Ben Alaya H, Echouk A, Elati Z. Le fardeau d’anxiété chez les patients hémodialysés chroniques. Nephrol Ther 2022. [DOI: 10.1016/j.nephro.2022.07.149] [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: 10/14/2022]
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5
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Ayed A, Gati M, Brahim MH, Jaballah L, Trimech C, Elati Z. Impact du jeûne de Ramadan sur les fonctions rénales chez les patients atteints d’insuffisance rénale chronique. Nephrol Ther 2022. [DOI: 10.1016/j.nephro.2022.07.365] [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: 10/14/2022]
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Brahim MH, Gati M, Ayed A, Jaballah L, Ati ZE. Cas : rhabdomyolyse secondaire à une varicelle. Nephrol Ther 2022. [DOI: 10.1016/j.nephro.2022.07.385] [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: 10/14/2022]
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Ayed A, Chemli I, Ayed S, Ben Salem M, Haouala F, Letaief A, Ben Saleh M, Hammouda M, Aloui S, Skhiri H. Activité physique chez les hémodialysés chroniques : à propos de 71 patients. Nephrol Ther 2020. [DOI: 10.1016/j.nephro.2020.07.086] [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: 11/28/2022]
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8
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Mani H, Hamouda M, Ayed A, Ben Salem M, Letaief A, Aloui S, Skhiri H. SUN-344 AVASCULAR NECROSIS IN KIDNEY TRANSPLANT RECIPIENTS. Kidney Int Rep 2020. [DOI: 10.1016/j.ekir.2020.02.882] [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: 10/24/2022] Open
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9
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Ayed A, Ben Salem M, Haouala F, Letaief A, Jaafar I, Hammouda M, Aloui S, Skhiri H. Survie de la technique et du patient : un fardeau en dialyse péritonéale. Nephrol Ther 2019. [DOI: 10.1016/j.nephro.2019.07.151] [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: 11/28/2022]
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10
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Tissino E, Benedetti D, Herman SEM, Ten Hacken E, Ahn IE, Chaffee KG, Rossi FM, Dal Bo M, Bulian P, Bomben R, Bayer E, Härzschel A, Gutjahr JC, Postorino M, Santinelli E, Ayed A, Zaja F, Chiarenza A, Pozzato G, Chigaev A, Sklar LA, Burger JA, Ferrajoli A, Shanafelt TD, Wiestner A, Del Poeta G, Hartmann TN, Gattei V, Zucchetto A. Functional and clinical relevance of VLA-4 (CD49d/CD29) in ibrutinib-treated chronic lymphocytic leukemia. J Exp Med 2018; 215:681-697. [PMID: 29301866 PMCID: PMC5789417 DOI: 10.1084/jem.20171288] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [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] [Received: 07/20/2017] [Revised: 10/20/2017] [Accepted: 11/28/2017] [Indexed: 01/02/2023] Open
Abstract
Tissino et al. demonstrate that in chronic lymphocytic leukemia, the VLA-4 (CD49d/CD29) integrin remains activable by B cell receptor stimulation also upon in vitro and in vivo ibrutinib exposure. Clinically, ibrutinib-treated CD49d-positive CLL patients experience reduced recirculation lymphocytosis and nodal response and inferior outcomes. The Bruton’s tyrosine kinase (BTK) inhibitor ibrutinib, which antagonizes B cell receptor (BCR) signals, demonstrates remarkable clinical activity in chronic lymphocytic leukemia (CLL). The lymphocytosis experienced by most patients under ibrutinib has previously been attributed to inhibition of BTK-dependent integrin and chemokine cues operating to retain the tumor cells in nodal compartments. Here, we show that the VLA-4 integrin, as expressed by CD49d-positive CLL, can be inside-out activated upon BCR triggering, thus reinforcing the adhesive capacities of CLL cells. In vitro and in vivo ibrutinib treatment, although reducing the constitutive VLA-4 activation and cell adhesion, can be overcome by exogenous BCR triggering in a BTK-independent manner involving PI3K. Clinically, in three independent ibrutinib-treated CLL cohorts, CD49d expression identifies cases with reduced lymphocytosis and inferior nodal response and behaves as independent predictor of shorter progression-free survival, suggesting the retention of CD49d-expressing CLL cells in tissue sites via activated VLA-4. Evaluation of CD49d expression should be incorporated in the characterization of CLL undergoing therapy with BCR inhibitors.
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Affiliation(s)
- Erika Tissino
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Dania Benedetti
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Sarah E M Herman
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Elisa Ten Hacken
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Inhye E Ahn
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | | | - Francesca Maria Rossi
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Michele Dal Bo
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Pietro Bulian
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Riccardo Bomben
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Elisabeth Bayer
- Third Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases, and Rheumatology, Oncologic Center, Paracelsus Medical University, Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg Cancer Research Institute-Laboratory for Immunological and Molecular Cancer Research, Salzburg, Austria
| | - Andrea Härzschel
- Third Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases, and Rheumatology, Oncologic Center, Paracelsus Medical University, Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg Cancer Research Institute-Laboratory for Immunological and Molecular Cancer Research, Salzburg, Austria
| | - Julia Christine Gutjahr
- Third Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases, and Rheumatology, Oncologic Center, Paracelsus Medical University, Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg Cancer Research Institute-Laboratory for Immunological and Molecular Cancer Research, Salzburg, Austria
| | | | - Enrico Santinelli
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy.,Division of Hematology, S. Eugenio Hospital and University of Tor Vergata, Rome, Italy
| | - Ayed Ayed
- Mayo Clinic College of Medicine, Rochester, MN
| | - Francesco Zaja
- Clinica Ematologica, Centro Trapianti e Terapie Cellulari "Carlo Melzi" DISM, Azienda Ospedaliera Universitaria S. Maria Misericordia, Udine, Italy
| | | | - Gabriele Pozzato
- Department of Internal Medicine and Hematology, Maggiore General Hospital, University of Trieste, Trieste, Italy
| | - Alexandre Chigaev
- Department of Pathology and Cancer Center, University of New Mexico, Albuquerque, NM
| | - Larry A Sklar
- Department of Pathology and Cancer Center, University of New Mexico, Albuquerque, NM
| | - Jan A Burger
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
| | - Alessandra Ferrajoli
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX
| | | | - Adrian Wiestner
- Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | - Giovanni Del Poeta
- Division of Hematology, S. Eugenio Hospital and University of Tor Vergata, Rome, Italy
| | - Tanja Nicole Hartmann
- Third Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases, and Rheumatology, Oncologic Center, Paracelsus Medical University, Salzburg, Austria.,Cancer Cluster Salzburg, Salzburg Cancer Research Institute-Laboratory for Immunological and Molecular Cancer Research, Salzburg, Austria
| | - Valter Gattei
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
| | - Antonella Zucchetto
- Clinical and Experimental Onco-Hematology Unit, CRO Aviano National Cancer Institute, Aviano, Italy
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11
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Tissino E, Benedetti D, Herman S, ten Hacken E, Ahn I, Chaffee K, Bayer E, Haerzschel A, Gutjahr J, Postorino M, Santinelli E, Ayed A, Zaja F, Chiarenza A, Chigaev A, Sklar L, Burger J, Ferrajoli A, Shanafelt T, Wiestner A, Del Poeta G, Hartmann T, Gattei V, Zucchetto A. INSIDE-OUT VLA-4 INTEGRIN ACTIVATION IS MAINTAINED IN IBRUTINIB-TREATED CHRONIC LYMPHOCYTIC LEUKEMIA EXPRESSING CD49D: CLINICAL RELEVANCE. Hematol Oncol 2017. [DOI: 10.1002/hon.2437_98] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- E. Tissino
- Centro di Riferimento Oncologico, I.R.C.C.S; Clinical and Experimental Onco-Hematology Unit; Aviano Italy
| | - D. Benedetti
- Centro di Riferimento Oncologico, I.R.C.C.S; Clinical and Experimental Onco-Hematology Unit; Aviano Italy
| | - S.E. Herman
- Hematology Branch; National Heart, Lung, and Blood Institute, NIH, Bethesda; Maryland USA
| | - E. ten Hacken
- Department of Medical Oncology; Dana Farber Cancer Institute; Boston Massachusetts USA
| | - I.E. Ahn
- Hematology Branch; National Heart, Lung, and Blood Institute, NIH, Bethesda; Maryland USA
| | - K.G. Chaffee
- Department of Health Sciences Research; Mayo Clinic College of Medicine; Rochester Minnesota USA
| | - E. Bayer
- Oncologic Center, Paracelsus Medical University; Laboratory for Immunological and Molecular Cancer Research, 3rd Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases and Rheumatology; Salzburg Austria
| | - A. Haerzschel
- Oncologic Center, Paracelsus Medical University; Laboratory for Immunological and Molecular Cancer Research, 3rd Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases and Rheumatology; Salzburg Austria
| | - J.C. Gutjahr
- Oncologic Center, Paracelsus Medical University; Laboratory for Immunological and Molecular Cancer Research, 3rd Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases and Rheumatology; Salzburg Austria
| | - M. Postorino
- Division of Hematology; S. Eugenio Hospital and University of Tor Vergata; Rome Italy
| | - E. Santinelli
- Division of Hematology; S. Eugenio Hospital and University of Tor Vergata; Rome Italy
| | - A. Ayed
- Department of Health Sciences Research; Mayo Clinic College of Medicine; Rochester Minnesota USA
| | - F. Zaja
- Clinica Ematologica, Centro Trapianti e Terapie Cellulari "Carlo Melzi" DISM; Azienda Ospedaliera Universitaria S. Maria Misericordia; Udine Italy
| | - A. Chiarenza
- Division of Hematology; Ferrarotto Hospital; Catania Italy
| | - A. Chigaev
- Department of Pathology and Cancer Center; University of New Mexico; Albuquerque New Mexico USA
| | - L.A. Sklar
- Department of Pathology and Cancer Center; University of New Mexico; Albuquerque New Mexico USA
| | - J.A. Burger
- Department of Leukemia; The University of Texas MD Anderson Cancer Center; Houston Texas USA
| | - A. Ferrajoli
- Department of Leukemia; The University of Texas MD Anderson Cancer Center; Houston Texas USA
| | - T.D. Shanafelt
- Department of Health Sciences Research; Mayo Clinic College of Medicine; Rochester Minnesota USA
| | - A. Wiestner
- Hematology Branch; National Heart, Lung, and Blood Institute, NIH, Bethesda; Maryland USA
| | - G. Del Poeta
- Division of Hematology; S. Eugenio Hospital and University of Tor Vergata; Rome Italy
| | - T.N. Hartmann
- Oncologic Center, Paracelsus Medical University; Laboratory for Immunological and Molecular Cancer Research, 3rd Medical Department with Hematology, Medical Oncology, Hemostaseology, Infectious Diseases and Rheumatology; Salzburg Austria
| | - V. Gattei
- Centro di Riferimento Oncologico, I.R.C.C.S; Clinical and Experimental Onco-Hematology Unit; Aviano Italy
| | - A. Zucchetto
- Centro di Riferimento Oncologico, I.R.C.C.S; Clinical and Experimental Onco-Hematology Unit; Aviano Italy
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12
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Affiliation(s)
- H Najah
- Service de chirurgie générale, viscérale et endocrinienne, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - G Godiris Petit
- Service de chirurgie générale, viscérale et endocrinienne, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - S Noullet
- Service de chirurgie générale, viscérale et endocrinienne, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - A Ayed
- Service de radiologie, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - F Menegaux
- Service de chirurgie générale, viscérale et endocrinienne, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France
| | - C Trésallet
- Service de chirurgie générale, viscérale et endocrinienne, Hôpital de la Pitié Salpêtrière, AP-HP, Pierre-et-Marie-Curie, Sorbonne Universités, Paris 6, 47-83, boulevard de l'Hôpital, 75013 Paris, France.
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Ben Salem S, Sithom A, Ben Dhia I, Khelifi T, Askri H, Ayed A. Central serous chorioretinopathy after nasal corticosteroids in the aviator. Tunis Med 2016; 94:893. [PMID: 28994894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
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14
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Hamouda M, Ayed A, Elhani S, Letaief A, Aloui S, Skhiri H, Ammeur F, Elmay M, Bendhia N. La microangiopathie gravidique : à propos de 7 cas. Nephrol Ther 2016. [DOI: 10.1016/j.nephro.2016.07.230] [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: 10/21/2022]
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15
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Renard-Penna R, Ayed A, Barrou B, Grenier P. [Pre-kidney-transplant evaluation of donors and recipients]. J Radiol 2011; 92:358-66. [PMID: 21549891 DOI: 10.1016/j.jradio.2011.03.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Accepted: 03/04/2011] [Indexed: 11/29/2022]
Abstract
The pretransplant imaging evaluation of recipients is mainly achieved with CT and has two objectives: detection of iliac artery calcifications that may have an impact on the site of the transplant and the type of arterial anastomosis; detection of a primary malignancy that would be a contraindication to transplantation. The pretransplant imaging evaluation of living donors relies on noninvasive techniques. CT angiography and MR angiography both allow the simultaneous evaluation of arteries, excretory tract and renal parenchyma. The goal is to achieve anatomical and functional renal evaluation in order to select the best donor and plan the surgical procedure.
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Affiliation(s)
- R Renard-Penna
- Service de Radiologie Polyvalente Diagnostique et Interventionnelle, Hôpital Pitié-Salpêtrière, 47 Boulevard de l'Hôpital, 75014 Paris, France.
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Abal AT, Ayed A, Nair PCMG, Mosawi M, Behbehani N. Factors responsible for asthma and rhinitis among Kuwaiti schoolchildren. Med Princ Pract 2010; 19:295-8. [PMID: 20516706 DOI: 10.1159/000312716] [Citation(s) in RCA: 14] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Accepted: 08/06/2009] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE The aim of this study was to assess the prevalence of asthma among schoolchildren and to determine the level house dust mites in Kuwaiti homes and its role in asthma and rhinitis. SUBJECTS AND METHOD The International Study of Asthma and Allergy in Children questionnaire was distributed to schoolchildren in the age group of 5-7 years, after random sampling from all the five governorates of Kuwait. The questionnaires were completed and initiated by parents with the help of the investigator and parents. House dust was collected from the bedroom floor of 549 houses in the same geographical areas where the schoolchildren were sampled, extracted and assayed for mite Der p 1 by ELISA method. RESULTS The estimated prevalence of asthma was 22.4% and that of rhinitis was 23%. House dust collected from the bedroom floor was found to contain low levels of Der p 1. There was no significant difference (p = 0.969) in the level of Der p 1 between areas in Kuwait. The highest levels of Der p 1 ranged from 0.02 to 0.10 mg/g in 3.5% of the total samples examined. CONCLUSIONS There is a high prevalence of asthma and rhinitis among the schoolchildren in Kuwait. However, the level of dust mitogens investigated in this study was below the level of concern, thus undermining their role in increasing asthma cases in Kuwait. Therefore, further studies are needed to understand the role of other mite allergens and other factors that contribute to the increased prevalence of allergic diseases in Kuwaiti children.
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Affiliation(s)
- A T Abal
- Department of Medicine, Faculty of Medicine, Kuwait University, Salmiya 22077, Kuwait.
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Nguyen NT, Maurus R, Stokell DJ, Ayed A, Duckworth HW, Brayer GD. Comparative analysis of folding and substrate binding sites between regulated hexameric type II citrate synthases and unregulated dimeric type I enzymes. Biochemistry 2001; 40:13177-87. [PMID: 11683626 DOI: 10.1021/bi010408o] [Citation(s) in RCA: 37] [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] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe the first structure determination of a type II citrate synthase, an enzyme uniquely found in Gram-negative bacteria. Such enzymes are hexameric and are strongly and specifically inhibited by NADH through an allosteric mechanism. This is in contrast to the widespread dimeric type I citrate synthases found in other organisms, which do not show allosteric properties. Our structure of the hexameric type II citrate synthase from Escherichia coli is composed of three identical dimer units arranged about a central 3-fold axis. The interactions that lead to hexamer formation are concentrated in a relatively small region composed of helix F, FG and IJ helical turns, and a seven-residue loop between helices J and K. This latter loop is present only in type II citrate synthase sequences. Running through the middle of the hexamer complex, and along the 3-fold axis relating dimer units, is a remarkable pore lined with 18 cationic residues and an associated hydrogen-bonded network. Also unexpected was the observation of a novel N-terminal domain, formed by the collective interactions of the first 52 residues from the two subunits of each dimer. The domain formed is rich in beta-sheet structure and has no counterpart in previous structural studies of type I citrate synthases. This domain is located well away from the dimer-dimer contacts that form the hexamer, and it is not involved in hexamer formation. Another surprising observation from the structure of type II E. coli citrate synthase is the unusual polypeptide chain folding found at the putative acetylcoenzyme A binding site. Key parts of this region, including His264 and a portion of polypeptide chain known from type I structures to form an adenine binding loop (residues 299-303), are shifted by as much as 10 A from where they must be for substrate binding and catalysis to occur. Furthermore, the adjacent polypeptide chain composed of residues 267-297 is extremely mobile in our structure. Thus, acetylcoenzyme A binding to type II E. coli citrate synthase would require substantial structural shifts and a concerted refolding of the polypeptide chain to form an appropriate binding subsite. We propose that this essential rearrangement of the acetylcoenzyme A binding part of the active site is also a major feature of allostery in type II citrate synthases. Overall, this study suggests that the evolutionary development of hexameric association, the elaboration of a novel N-terminal domain, introduction of a NADH binding site, and the need to refold a key substrate binding site are all elements that have been developed to allow for the allosteric control of catalysis in the type II citrate synthases.
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Affiliation(s)
- N T Nguyen
- Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver V6T 1Z3, Canada
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18
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Abstract
p53 is a nuclear phosphoprotein that regulates cellular fate after genotoxic stress through its role as a transcriptional regulator of genes involved in cell cycle control and apoptosis. The C-terminal region of p53 is known to negatively regulate sequence specific DNA-binding of p53; modifications to the C-terminus relieve this inhibition. Two models have been proposed to explain this latency: (i) an allosteric model in which the C-terminal domain interacts with another domain of p53 or (ii) a competitive model in which the C-terminal and the core domains compete for DNA binding. We have characterized latent and active forms of dimeric p53 using gel mobility shift assays and NMR spectroscopy. We show on the basis of chemical shifts that dimeric p53 both containing and lacking the C-terminal domain are identical in conformation and that the C-terminus does not interact with other p53 domains. Similarly, NMR spectra of isolated core and tetramerization domains confirm a modular p53 architecture. The data presented here rule out an allosteric model for the regulation of p53.
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Affiliation(s)
- A Ayed
- Ontario Cancer Institute, and Department of Medical Biophysics, University of Toronto, 610 University Ave., Toronto, Ontario M5G 2M9, Canada.
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19
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Abstract
The aim of this study was to compare the clinical characteristics, histological type, stage at diagnosis, treatment and survival of young (< or = 45 years) and older patients with bronchogenic carcinoma. The study was designed as a retrospective review of all lung cancer patients referred to the Kuwait Cancer Control Center over a 10-year period from 1985 to 1994. The study comprised 590 patients with primary bronchogenic carcinoma, of whom 72 (12%) were < or = 45 years of age at the time of diagnosis. Median (range) duration of symptoms, percentage of smokers and male to female ratios for the younger and older patients were 8 (2-48) weeks vs. 8 (1-52) weeks (p = 0.9), 74% vs. 83% (p = 0.06) and 5.5 vs. 5.3, respectively. The majority of patients had advanced stage disease at presentation; 91% of the younger patients had stage III or IV compared with 88% of the older patients (p = 0.1). The histological types for the younger and older patients were 32% vs. 20% for adenocarcinoma (p = 0.01) and 33% vs. 45% for squamous cell carcinoma (p = 0.1). There were more patients in the younger group who had surgery (21% vs. 7.5%) than in the older group (p = 0.001). Follow-up data were available for 177 patients out of 190 Kuwaiti national patients (93%). The median (range) survival rates for young and old patients were 8 (3-62) months and 7 (1-174) months, respectively (p = 0.09). Only 6 patients survived for more than 5 years, one (7.6%) from the younger group and 5 (3%) from the older group. Our study shows a relatively high percentage of young patients in our population of lung cancer patients. Apart from the higher incidence of adenocarcinoma in the young group and the fact that these patients had more surgery than the older group, there were no other significant differences between the two groups.
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20
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Krutchinsky AN, Ayed A, Donald LJ, Ens W, Duckworth HW, Standing KG. Studies of noncovalent complexes in an electrospray ionization/time-of-flight mass spectrometer. Methods Mol Biol 2001; 146:239-49. [PMID: 10948506 DOI: 10.1385/1-59259-045-4:239] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Affiliation(s)
- A N Krutchinsky
- Department of Physics, University of Manitoba, Winnipeg, Canada
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21
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Abstract
Interleukin-8 (IL-8) is considered as the major polymorphonuclear neutrophils (PMNs) chemoattractant cytokine in lung diseases such as asthma and adult respiratory distress syndrome (ARDS). However, controversial results were obtained regarding the involvement of IL-8 in the pathogenesis of pneumonia. This study examines the role of IL-8 in the recruitment and activation of PMNs in the lung of pneumonia patients. The interesting aspect of this study is that it is a site- specific analysis of the infected and uninfected lungs of the same patient. The level of IL-8 mRNA, protein and myeloperoxidase present in the cells of the bronchioalveolar lavages (BALs) taken from the areas of known pneumonic consolidations on chest X-ray (infected lung) are compared with the BALs obtained from areas of no obvious infiltrate (non-infected lung). The results obtained from the infected and non-infected lungs of pneumonic patients were further compared with that of a control group of non-smoking patients. The level of IL-8 mRNA and protein were determined by RT-PCR and ELISA respectively. There was a significant increase in the level of IL-8 mRNA in the infected lung as compared to its level in the non-infected lung (p < 0.001). In correlation with the increase in mRNA, IL-8 protein concentrations in BAL fluids from the infected lung were 6 fold higher than those taken from the non-infected lung (p < 0.0001). This pattern was also consistent with MPO activity in the BALs (4.5 fold more MPO activity in the infected lung as compared to that of the non-infected lung), indicating that IL-8 is directly implicated in neutrophil accumulation that follows acute respiratory infection. The results of the present study, therefore, indicate the involvement of IL-8 in the pathogenesis of pneumonia.
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Affiliation(s)
- H Abul
- Department of Pharmacology, Faculty of Medicine, Kuwait University Health Sciences Center, Safat
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22
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Mulder FA, Ayed A, Yang D, Arrowsmith CH, Kay LE. Assignment of 1H(N), 15N, 13C(alpha), 13CO and 13C(beta) resonances in a 67 kDa p53 dimer using 4D-TROSY NMR spectroscopy. J Biomol NMR 2000; 18:173-176. [PMID: 11101222 DOI: 10.1023/a:1008317825976] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The p53 tumor suppressor is a transcription factor that plays a crucial role in the activation of genes in response to DNA damage. As a first step towards detailed structural studies of the molecule aimed at understanding its regulation, we have used 4D-TROSY triple resonance NMR spectroscopy to obtain nearly complete 1H(N), 15N, 13C(alpha), 13CO and 13C(beta) resonance assignments of a dimeric form of the protein comprising DNA-binding and oligomerization domains (67 kDa). A simple comparison of 4D spectra recorded on p53 molecules consisting of DNA-binding and oligomerization domains with and without the regulatory domain establishes that both constructs have essentially identical chemical shifts. Although the affinity of p53 for target DNA is decreased in constructs containing the regulatory domain, the chemical shift results reported here suggest that this decrease is not due to specific domain interactions involving the regulatory portion of the molecule, or alternatively, that such interactions require the presence of DNA.
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Affiliation(s)
- F A Mulder
- Protein Engineering Centers of Excellence and Department of Medical Genetics, The University of Toronto, ON, Canada
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23
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Li PX, Wong J, Ayed A, Ngo D, Brade AM, Arrowsmith C, Austin RC, Klamut HJ. Placental transforming growth factor-beta is a downstream mediator of the growth arrest and apoptotic response of tumor cells to DNA damage and p53 overexpression. J Biol Chem 2000; 275:20127-35. [PMID: 10777512 DOI: 10.1074/jbc.m909580199] [Citation(s) in RCA: 217] [Impact Index Per Article: 9.0] [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: 12/15/2022] Open
Abstract
The p53 tumor suppressor gene and members of the transforming growth factor-beta (TGF-beta) superfamily play central roles in signaling cell cycle arrest and apoptosis (programmed cell death) in normal development and differentiation, as well as in carcinogenesis. Here we describe a distantly related member of the TGF-beta superfamily, designated placental TGF-beta (PTGF-beta), that is up-regulated in response to both p53-dependent and -independent apoptotic signaling events arising from DNA damage in human breast cancer cells. PTGF-beta is normally expressed in placenta and at lower levels in kidney, lung, pancreas, and muscle but could not be detected in any tumor cell line studied. The PTGF-beta promoter is activated by p53 and contains two p53 binding site motifs. Functional studies demonstrated that one of these p53 binding sites is essential for p53-mediated PTGF-beta promoter induction and specifically binds recombinant p53 in gel mobility shift assays. PTGF-beta overexpression from a recombinant adenoviral vector (AdPTGF-beta) led to an 80% reduction in MDA-MB-468 breast cancer cell viability and a 50-60% reduction in other human breast cancer cell lines studied, including MCF-7 cells, which are resistant to growth inhibition by recombinant wild-type p53. Like p53, PTGF-beta overexpression was seen to induce both G(1) cell cycle arrest and apoptosis in breast tumor cells. These results provide the first evidence for a direct functional link between p53 and the TGF-beta superfamily and implicate PTGF-beta as an important intercellular mediator of p53 function and the cytostatic effects of radiation and chemotherapeutic cancer agents.
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Affiliation(s)
- P X Li
- Divisions of Experimental Therapeutics and Molecular and Structural Biology, Ontario Cancer Institute, Princess Margaret Hospital, University Health Network, Toronto, Ontario, Canada
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24
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Affiliation(s)
- A C Longe
- Department of Medicine, College of Medicine, King Khalid University, Abha, Saudi Arabia
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25
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Abstract
p73 and p63 are two recently cloned genes with homology to the tumor suppressor p53, whose protein product is a key transcriptional regulator of genes involved in cell cycle arrest and apoptosis. While all three proteins share conserved transcriptional activation, DNA-binding and oligomerization domains, p73 and p63 have an additional conserved C-terminal region. We have determined the three-dimensional solution structure of this conserved C-terminal domain of human p73. The structure reveals a small five-helix bundle with striking similarity to the SAM (sterile alpha motif) domains of two ephrin receptor tyrosine kinases. The SAM domain is a putative protein-protein interaction domain found in a variety of cytoplasmic signaling proteins and has been shown to form both homo- and hetero-oligomers. However, the SAM-like C-terminal domains of p73 and p63 are monomeric and do not interact with one another, suggesting that this domain may interact with additional, as yet uncharacterized proteins in a signaling and/or regulatory role.
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Affiliation(s)
- S W Chi
- Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, 610 University Avenue, Toronto, Ontario, Canada M5G 2M9
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26
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Davison TS, Vagner C, Kaghad M, Ayed A, Caput D, Arrowsmith CH. p73 and p63 are homotetramers capable of weak heterotypic interactions with each other but not with p53. J Biol Chem 1999; 274:18709-14. [PMID: 10373484 DOI: 10.1074/jbc.274.26.18709] [Citation(s) in RCA: 121] [Impact Index Per Article: 4.8] [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: 01/22/2023] Open
Abstract
Mutations in the p53 tumor suppressor gene are the most frequent genetic alterations found in human cancers. Recent identification of two human homologues of p53 has raised the prospect of functional interactions between family members via a conserved oligomerization domain. Here we report in vitro and in vivo analysis of homo- and hetero-oligomerization of p53 and its homologues, p63 and p73. The oligomerization domains of p63 and p73 can independently fold into stable homotetramers, as previously observed for p53. However, the oligomerization domain of p53 does not associate with that of either p73 or p63, even when p53 is in 15-fold excess. On the other hand, the oligomerization domains of p63 and p73 are able to weakly associate with one another in vitro. In vivo co-transfection assays of the ability of p53 and its homologues to activate reporter genes showed that a DNA-binding mutant of p53 was not able to act in a dominant negative manner over wild-type p73 or p63 but that a p73 mutant could inhibit the activity of wild-type p63. These data suggest that mutant p53 in cancer cells will not interact with endogenous or exogenous p63 or p73 via their respective oligomerization domains. It also establishes that the multiple isoforms of p63 as well as those of p73 are capable of interacting via their common oligomerization domain.
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Affiliation(s)
- T S Davison
- Ontario Cancer Institute and Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2M9, Canada
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27
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Abstract
Urea-induced unfolding of Escherichia coli citrate synthase occurs in two phases, as monitored by circular dichroism at 222 nm (measuring secondary structure) or by tryptophan fluorescence. In this paper we characterize the intermediate state, which retains about 40% of the ellipticity of the native state, and is stable between 2.5 M and 5.5 M urea, approximately. This intermediate binds significant amounts of the probe for hydrophobic surfaces, anilinonaphthalene sulfonate, but forms aggregates at least as high as an octamer, as shown by transverse urea gradient polyacrylamide electrophoresis. Thermal denaturation of E. coli citrate synthase also produces an intermediate at temperatures near 60 degrees C, which also retains about 40% of the native ellipticity and forms aggregates, as measured by electrospray-ionization/time-of-flight mass spectrometry. We have used a collection of "cavity-forming" mutant proteins, in which bulky buried hydrophobic residues are replaced by alanines, to explore the nature of the intermediate state further. A certain amount of these mutant proteins shows a destabilized intermediate, as measured by the urea concentration range in which the intermediate is observed. These mutants are found in parts of the citrate synthase sequence that, in a native state, form helices G, M, N, Q, R, and S. From this and other evidence, it is argued that the intermediate state is an aggregated state in which these six helices, or parts of them, remain folded, and that formation of this intermediate is also likely to be a key step in the folding of E. coli citrate synthase.
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Affiliation(s)
- A Ayed
- Department of Chemistry, University of Manitoba, Winnipeg, Canada
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28
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Potier N, Donald LJ, Chernushevich I, Ayed A, Ens W, Arrowsmith CH, Standing KG, Duckworth HW. Study of a noncovalent trp repressor: DNA operator complex by electrospray ionization time-of-flight mass spectrometry. Protein Sci 1998; 7:1388-95. [PMID: 9655343 PMCID: PMC2144026 DOI: 10.1002/pro.5560070615] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [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: 11/09/2022]
Abstract
Electrospray ionization time-of-flight mass spectrometry (ESI-TOF MS) has been used to study noncovalent interactions between the trp apo-repressor (TrpR), its co-repressor tryptophan and its specific operator DNA. In 5 mM ammonium acetate, TrpR was detected as a partially unfolded monomer. In the presence of a 21-base-pair DNA possessing the two symmetrically arranged CTAG consensus sequences required for specific TrpR binding, a homodimer-dsDNA complex with a 1:1 stoichiometry was observed. Co-repressor was not needed for the complex to form under our experimental conditions. Collision induced dissociation (CID-MS) revealed that this complex was very stable in the gas phase since dissociation was achieved only at energies that also broke covalent bonds. We saw no evidence for the presence of the six water molecules that mediate the interaction between the protein and the DNA in the crystal structure. To check the binding specificity of the TrpR for its target DNA, a competitive experiment was undertaken: the protein was mixed with an equimolar amount of three different DNAs in which the two CTAG sequences were separated by 2, 4, and 6 bp, respectively. Only the DNA with the correct consensus spacing of 4 bp was able to form stable interactions with TrpR. This experiment demonstrates the potential of ESI-MS to test the sequence-specificity of protein-DNA complexes. The interactions between the TrpR-DNA complex and 5-methyl-, L- and D-tryptophan were also investigated. Two molecules of 5-methyl- or L-tryptophan were bound with high affinity to the TrpR-DNA complex. On the other hand, D-tryptophan appeared to bind to the complex with poor specificity and poor affinity.
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Affiliation(s)
- N Potier
- Department of Physics, University of Manitoba, Winnipeg, Canada
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Ayed A, Krutchinsky AN, Ens W, Standing KG, Duckworth HW. Quantitative evaluation of protein-protein and ligand-protein equilibria of a large allosteric enzyme by electrospray ionization time-of-flight mass spectrometry. Rapid Commun Mass Spectrom 1998; 12:339-344. [PMID: 9554114 DOI: 10.1002/(sici)1097-0231(19980415)12:7<339::aid-rcm163>3.0.co;2-6] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A mass spectrometer coupling electrospray ionization with time-of-flight mass spectrometry (ESI-TOFMS) has been used to investigate the oligomeric species of Escherichia coli citrate synthase, and to determine the effect of nicotinamide adenine dinucleotide (NADH), an allosteric inhibitor of this enzyme, on the equilibrium between the oligomeric forms. An equilibrium mixture of dimers (M = 95,770 Da) and hexamers (M = 287,310 Da) was found under the conditions used (KA = 6.9 x 10(10) M-2), and NADH was observed to bind selectively to the hexamer (KD = 1.1 microM), shifting the equilibrium to the latter form. The power of ESI-TOFMS to measure ions of very large mass-to-charge ratio (up to m/z approximately 10,000 in this case) is shown to be a valuable tool for obtaining accurate information about compositions of noncovalent complexes and equilibrium constants. The measured constants agree with those determined by conventional means.
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Affiliation(s)
- A Ayed
- Department of Chemistry, University of Manitoba, Winnipeg, Canada
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Casson AG, McCuaig S, Craig I, Ayed A, Inculet R, Kerkvliet N, O'Malley F. Prognostic value and clinicopathologic correlation of p53 gene mutations and nuclear DNA content in human lung cancer: a prospective study. J Surg Oncol 1994; 56:13-20. [PMID: 8176935 DOI: 10.1002/jso.2930560105] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 01/29/2023]
Abstract
The aim of this prospective study was to determine whether use of a combination of biomarkers, p53 and nuclear DNA content, led to improved prognosis and clinicopathologic correlation in human non-small cell lung cancer. Nineteen patients undergoing curative resection of primary non-small cell lung cancer were evaluated. Resected tumors were studied by polymerase chain reaction/single strand conformation polymorphism analysis (p53 gene mutations), flow cytometry (nuclear DNA content and cell cycle analysis), and immunohistochemically (p53 oncoprotein). Histologically normal lung was used as an internal control for each patient. Minimum postoperative follow-up was 4 years. p53 gene mutations (5/19 tumors; 26%), tumor ploidy (5/19 diploid), patterns of immunoreactivity, or combination of biomarkers did not appear to correlate with clinicopathologic findings or clinical outcome. Two of three patients with associated second primary malignancies, had squamous cell diploid tumors with p53 gene mutations. We conclude that p53 gene mutations and tumor ploidy may represent different biologic markers for human non-small cell lung cancer. Although trends in improved predictive accuracy were not seen when both markers were incorporated into the tumor analysis, flow cytometry and molecular analysis of the p53 gene may identify patients at increased risk of the development of a second primary malignancy.
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Affiliation(s)
- A G Casson
- Department of Surgery, University of Western Ontario, Victoria Hospital, London, Canada
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Hamida C, Ayed A, Horchani A, Smida L, Zmerli S. [Cancer of the prostate. Diagnostic study and therapeutic approach: Apropos of 89 cases (1974-1978)]. Tunis Med 1979; 57:264-8. [PMID: 555098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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