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Hagendorff A, Helfen A, Brandt R, Knebel F, Altiok E, Ewers A, Haghi D, Knierim J, Merke N, Romero-Dorta E, Ruf T, Sinning C, Stöbe S, Ewen S. Expert proposal to analyze the combination of aortic and mitral regurgitation in multiple valvular heart disease by comprehensive echocardiography. Clin Res Cardiol 2024; 113:393-411. [PMID: 37212864 PMCID: PMC10881739 DOI: 10.1007/s00392-023-02227-y] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 05/08/2023] [Indexed: 05/23/2023]
Abstract
The assessment of valvular pathologies in multiple valvular heart disease by echocardiography remains challenging. Data on echocardiographic assessment-especially in patients with combined aortic and mitral regurgitation-are rare in the literature. The proposed integrative approach using semi-quantitative parameters to grade the severity of regurgitation often yields inconsistent findings and results in misinterpretation. Therefore, this proposal aims to focus on a practical systematic echocardiographic analysis to understand the pathophysiology and hemodynamics in patients with combined aortic and mitral regurgitation. The quantitative approach of grading the regurgitant severity of each compound might be helpful in elucidating the scenario in combined aortic and mitral regurgitation. To this end, both the individual regurgitant fraction of each valve and the total regurgitant fraction of both valves must be determined. This work also outlines the methodological issues and limitations of the quantitative approach by echocardiography. Finally, we present a proposal that enables verifiable assessment of regurgitant fractions. The overall interpretation of echocardiographic results includes the symptomatology of patients with combined aortic and mitral regurgitation and the individual treatment options with respect to their individual risk. In summary, a reproducible, verifiable, and transparent in-depth echocardiographic investigation might ensure consistent hemodynamic plausibility of the quantitative results in patients with combined aortic and mitral regurgitation.
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Affiliation(s)
- Andreas Hagendorff
- Department of Cardiology, University of Leipzig, Liebigstrasse 20, 04103, Leipzig, Germany.
| | - A Helfen
- Department of Cardiology, Kath. St. Paulus Gesellschaft, St-Marien-Hospital Lunen, Altstadtstrasse 23, 44534, Lünen, Germany
| | - R Brandt
- Department of Cardiology, Kerckhoff Heart Center, Benekestr. 2‑8, 61231, Bad Nauheim, Germany
| | - F Knebel
- Klinik Für Innere Medizin II, Kardiologie, Sana Klinikum Lichtenberg, Fanningerstrasse 32, 10365, Berlin, Germany
- Department of Cardiology, Angiology and Intensive Care Medicine, University of Berlin, German Heart Center Charité Berlin, Campus Mitte, Chariteplatz 1, 10117, Berlin, Germany
| | - E Altiok
- Department of Cardiology, University of Aachen, Pauwelsstrasse 30, 52074, Aachen, Germany
| | - A Ewers
- Department of Cardiology and Angiology, BG University Hospital Bergmannsheil, de La Camp-Platz 1, 44789, Bochum, Germany
| | - D Haghi
- Kardiologische Praxisklinik Ludwigshafen-Akademische Lehrpraxis der Universitat Mannheim-Ludwig-Guttmann, Strasse 11, 67071, Ludwigshafen, Germany
| | - J Knierim
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Charité Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
- Paulinenkrankenhaus Berlin, Klinik Für Innere Medizin Und Kardiologie, Dickensweg 25‑39, 14055, Berlin, Germany
| | - N Merke
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Charité Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - E Romero-Dorta
- Department of Cardiology, Angiology and Intensive Care Medicine, University of Berlin, German Heart Center Charité Berlin, Campus Mitte, Chariteplatz 1, 10117, Berlin, Germany
| | - T Ruf
- Department of Cardiology, Center of Cardiology, Heart Valve Center, University Medical Center Mainz, University of Mainz, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - C Sinning
- Department of Cardiology, University Heart and Vascular Center Hamburg, German Centre of Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lubeck, Martinistrasse 52, 20251, Hamburg, Germany
| | - S Stöbe
- Department of Cardiology, University of Leipzig, Liebigstrasse 20, 04103, Leipzig, Germany
| | - S Ewen
- Zentrale Notaufnahme and Klinik Für Innere Medizin III, Kardiologie, Angiologie Und Internistische Intensivmedizin, Universitätsklinikum Des Saarlandes, Homburg, Germany
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2
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Lapa DA, Acácio GL, Trigo L, Goncalves RT, Catissi G, Gato B, Brandt R. Biocellulose patch technique for fetoscopic repair of open spina bifida in twin pregnancy. Ultrasound Obstet Gynecol 2023; 62:558-564. [PMID: 37128166 DOI: 10.1002/uog.26236] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 03/27/2023] [Accepted: 04/10/2023] [Indexed: 05/03/2023]
Abstract
OBJECTIVES Twin pregnancy is currently an exclusion criterion for prenatal repair of open spina bifida (OSB). The main objective of this study was to report on our experience of treating twin pregnancies with OSB using the skin-over-biocellulose for antenatal fetoscopic repair (SAFER) technique. We also discuss reconsideration of the current exclusion criteria for fetal OSB repair. METHODS Eight fetuses with OSB from seven twin pregnancies underwent successful prenatal repair. Six pregnancies were dichorionic diamniotic with only one twin affected, and one was monochorionic diamniotic with both twins affected. Percutaneous fetoscopy was performed under CO2 insufflation of the sac of the affected twin. Neurosurgical repair was performed using a biocellulose patch to protect the placode, with the skin sutured to hold the patch in place, with or without a myofascial flap. Neurodevelopment was assessed using the pediatric evaluation of disability inventory scale in babies older than 6 months of adjusted age, whereas the Alberta scale was used for babies younger than 6 months of adjusted age. RESULTS All 14 fetuses were liveborn and none required additional repair. Gestational age at surgery ranged from 27.3 to 31.1 weeks, and gestational age at birth ranged from 31.6 to 36.0 weeks. Four out of eight affected twins developed sepsis, but had a good recovery. No sequela of prematurity was found in any of the unaffected twins. Short-term neurodevelopment was normal in all evaluated unaffected twins (5/5) and in all but one affected twins (7/8). In the affected group, only one baby required ventriculoperitoneal shunt placement. CONCLUSIONS Prematurity is frequent after fetal surgery, and the risk is increased in twin pregnancy. Nevertheless, prenatal surgery using the SAFER technique is feasible, with low risk to both twins and their mother when performed by a highly experienced team. Long-term cognitive assessment of the unaffected twin is needed. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.
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Affiliation(s)
- D A Lapa
- Fetal Therapy Program, Hospital Israelita Albert Einstein, São Paulo, Brazil
- Fetal and Neonatal Therapy, Hospital Infantil Sabará, São Paulo, Brazil
| | - G L Acácio
- Fetal and Neonatal Therapy, Hospital Infantil Sabará, São Paulo, Brazil
- Department of Obstetrics and Gynecology, University of Taubaté, São Paulo, Brazil
| | - L Trigo
- BCNatal - Fetal Medicine Research Center, Hospital Clínic and Hospital Sant Joan de Déu, University of Barcelona, Barcelona, Spain
- Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Obstetrics and Gynecology Department, Pourtalès Hospital, Neuchâtel, Switzerland
- Faculty of Medicine and Health Sciences, University of Barcelona
| | - R T Goncalves
- Fetal Therapy Program, Hospital Israelita Albert Einstein, São Paulo, Brazil
- Gynecology Section, Hospital Servidor Público Estadual de São Paulo, São Paulo, Brazil
| | - G Catissi
- Fetal Therapy Program, Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - B Gato
- Anesthesiology Department, Hospital Israelita Albert Einstein, São Paulo, Brazil
| | - R Brandt
- Neurosurgery Department, Hospital Israelita Albert Einstein, São Paulo, Brazil
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3
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Hagendorff A, Helfen A, Brandt R, Altiok E, Breithardt O, Haghi D, Knierim J, Lavall D, Merke N, Sinning C, Stöbe S, Tschöpe C, Knebel F, Ewen S. Expert proposal to characterize cardiac diseases with normal or preserved left ventricular ejection fraction and symptoms of heart failure by comprehensive echocardiography. Clin Res Cardiol 2023; 112:1-38. [PMID: 35660948 PMCID: PMC9849322 DOI: 10.1007/s00392-022-02041-y] [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] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/10/2022] [Indexed: 01/22/2023]
Abstract
Currently, the term "heart failure with preserved left ventricular ejection fraction (HFpEF)" is based on echocardiographic parameters and clinical symptoms combined with elevated or normal levels of natriuretic peptides. Thus, "HFpEF" as a diagnosis subsumes multiple pathophysiological entities making a uniform management plan for "HFpEF" impossible. Therefore, a more specific characterization of the underlying cardiac pathologies in patients with preserved ejection fraction and symptoms of heart failure is mandatory. The present proposal seeks to offer practical support by a standardized echocardiographic workflow to characterize specific diagnostic entities associated with "HFpEF". It focuses on morphological and functional cardiac phenotypes characterized by echocardiography in patients with normal or preserved left ventricular ejection fraction (LVEF). The proposal discusses methodological issues to clarify why and when echocardiography is helpful to improve the diagnosis. Thus, the proposal addresses a systematic echocardiographic approach using a feasible algorithm with weighting criteria for interpretation of echocardiographic parameters related to patients with preserved ejection fraction and symptoms of heart failure. The authors consciously do not use the diagnosis "HFpEF" to avoid misunderstandings. Central illustration: Scheme illustrating the characteristic echocardiographic phenotypes and their combinations in patients with "HFpEF" symptoms with respect to the respective cardiac pathology and pathophysiology as well as the underlying typical disease.
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Affiliation(s)
- A. Hagendorff
- Department of Cardiology, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
| | - A. Helfen
- Department of Cardiology, Kath. St. Paulus Gesellschaft, St-Marien-Hospital Lünen, Altstadtstrasse 23, 44534 Lünen, Germany
| | - R. Brandt
- Department of Cardiology, Kerckhoff Heart Center, Benekestr. 2-8, 61231 Bad Nauheim, Germany
| | - E. Altiok
- Department of Cardiology, University of Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
| | - O. Breithardt
- Klinik für Innere Medizin-Kardiologie and Rhythmologie, Agaplesion Diakonie Kliniken Kassel, Herkulesstrasse 34, 34119 Kassel, Germany
| | - D. Haghi
- Kardiologische Praxisklinik Ludwigshafen-Akademische Lehrpraxis der Universität Mannheim-Ludwig-Guttmann, Strasse 11, 67071 Ludwigshafen, Germany
| | - J. Knierim
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Augustenburger Platz 1, 13353 Berlin, Germany ,Paulinenkrankenhaus Berlin, Klinik Für Innere Medizin Und Kardiologie, Dickensweg 25-39, 14055 Berlin, Germany
| | - D. Lavall
- Department of Cardiology, University of Leipzig, Liebigstrasse 20, 04103 Leipzig, Germany
| | - N. Merke
- Department of Cardiothoracic and Vascular Surgery, German Heart Center Berlin, Augustenburger Platz 1, 13353 Berlin, Germany
| | - C. Sinning
- Department of Cardiology, University Heart and Vascular Center Hamburg, German Centre of Cardiovascular Research (DZHK), Partner Site Hamburg/Kiel/Lübeck, Martinistrasse 52, 20251 Hamburg, Germany
| | - S. Stöbe
- Department of Cardiology, University of Leipzig, Liebigstrasse 20, 04103 Leipzig, Germany
| | - C. Tschöpe
- Berlin Institute of Health at Charité (BIH), Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany ,BIH Center for Regenerative Therapies (BCRT), Augustenburger Platz 1, 13353 Berlin, Germany ,German Centre for Cardiovascular Research DZHK, Partner Site Berlin, Augustenburger Platz 1, 13353 Berlin, Germany ,Department of Cardiology, Charité University Medicine Berlin, Campus Virchow Klinikum, Augustenburger Platz 1, 13353 Berlin, Germany
| | - F. Knebel
- Klinik Für Innere Medizin II, Kardiologie, Sana Klinikum Lichtenberg, Fanningerstrasse 32, 10365 Berlin, Germany ,Department of Cardiology, University of Berlin, Campus Charité Mitte, Charitéplatz 1, 10117 Berlin, Germany
| | - S. Ewen
- Zentrale Notaufnahme and Klinik Für Innere Medizin III, Kardiologie, Angiologie Und Internistische Intensivmedizin, Universitätsklinikum Des Saarlandes, Kirrberger Strasse, 66421 Homburg, Germany
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4
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Jost J, Brandt R, Altuner U, Müther M, Stummer W, Völker K, Wiewrodt R, Wiewrodt D. P08.12.B Conceptual development of an intensive supervised exercise program for brain tumor patients: summary of clinical experience. Neuro Oncol 2022. [DOI: 10.1093/neuonc/noac174.156] [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] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Several studies have identified beneficial effects of physical activity on reducing cancer-related symptoms. However, the number of such studies in neuro-oncology is limited, and even today, brain tumor patients are often advised against physically strenuous exercise. Here we summarize our experience with an individualized training program in brain tumor patients over a period of more than 8 years.
Material and Methods
Patients with primary brain tumors were invited to participate in the individual training program as part of the psycho-oncological consultation. If interested and free of major comorbidity, a professional sport scientist/diploma coach individualized two 60-minute sessions/week adapted to the patients’ respective symptoms and trained them on a 1:1-basis. One session consisted of bicycle ergometry at an average workload of 75% of the max. age-adjusted heart rate (up to 95% at peak; continuous monitoring throughout entire session), the other session was progressive whole-body resistance training based on 10 separate, but standardized exercise tasks using the university’s training facilities. Both training sessions were complimented by challenging elements to improve coordination. Exercise tasks were adapted as needed, and exercise levels were enhanced over time, if possible.
Results
From 2011 to 2019, 45 patients (19 women, 26 men) aged 20-76 years (mean 49) with different tumor types (65% high-grade gliomas, 22% low-grade gliomas, 13% other) participated in the program. The majority of patients started the program following concurrent radio-chemotherapy and in parallel with adjuvant systemic therapy. On average, 41 training sessions were performed. No training-related adverse events (e.g., falls, head pain, etc.) occurred during the entire period. In a total of 1828 training sessions, two minor epileptic seizures occurred (1 speech arrest; 1 simple focal seizure, left hand affected). Both patients were familiar with the respective type of seizure before entering the program and training could be continued immediately, with reduced intensity. Seizures did not reoccur during subsequent training sessions.
Conclusion
This supervised intensive physical training program with submaximal exertion zones was feasible, safe, and highly rated by all participants. Based on these experiences and the reported well-being of the patients, we launched a prospective oligocentric study to objectify the improvements in physical performance and quality of life in patients with glioblastoma (ClinicalTrials.gov Identifier: NCT05015543).
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Affiliation(s)
- J Jost
- Muenster University Hospital , Muenster , Germany
| | - R Brandt
- Muenster University Hospital , Muenster , Germany
| | - U Altuner
- Muenster University Hospital , Muenster , Germany
| | - M Müther
- Muenster University Hospital , Muenster , Germany
| | - W Stummer
- Muenster University Hospital , Muenster , Germany
| | - K Völker
- Muenster University Hospital , Muenster , Germany
| | - R Wiewrodt
- Muenster University Hospital , Muenster , Germany
| | - D Wiewrodt
- Muenster University Hospital , Muenster , Germany
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Hashemi-Nezhad SR, Brandt R, Westmeier W, Bamblevski VP, Krivopustov MI, Kulakov BA, Sosnin AN, Wan JS, Odoj R. Monte Carlo analysis of accelerator-driven systems: Studies on spallation neutron yield and energy gain. KERNTECHNIK 2022. [DOI: 10.1515/kern-2001-0013] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The neutron yield in the interaction of protons with lead and uranium targets has been studied using the LAHET code system. The dependence of the neutron multiplicity on target dimensions and proton energy has been calculated and the dependence of the energy amplification on the proton energy has been investigated in an accelerator-driven system of a given effective multiplication coefficient. Some of the results are compared with experimental findings and with similar calculations by the DCM/CEM code of Dubna and the FLUKA code system used in CERN.
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Affiliation(s)
- S. R. Hashemi-Nezhad
- Department of High Energy Physics, School of Physics, University of Sydney , A28, NSW 2006 , Sydney Australia
| | - R. Brandt
- Institut für Physikalische, Kern- und Makromolekulare Chemie , FB 15, Philipps-Universität , Marburg , Germany
| | - W. Westmeier
- Institut für Physikalische, Kern- und Makromolekulare Chemie , FB 15, Philipps-Universität , Marburg , Germany
| | | | | | - B. A. Kulakov
- Joint Institute for Nuclear Research, JINR , Dubna , Russia
| | - A. N. Sosnin
- Joint Institute for Nuclear Research, JINR , Dubna , Russia
| | - J.-S. Wan
- Northwest Institute of Nuclear Technology , 710024 Xian , China
| | - R. Odoj
- Institut fuer Sicherheitsforschung und Reaktorsicherheit, Forschungszentrum Juelich GmbH , Juelich , Germany
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6
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Wan JS, Brandt R, Sosnin AN, Krivopustov MI. Subcritical nuclear systems and their stability against changes in the geometrical set-up. KERNTECHNIK 2022. [DOI: 10.1515/kern-2001-0014] [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] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A specific subcritical reactor system has been suggested and the stability of its parameters against small changes in the geometrical set-up has been estimated using the model calculation code DCM/CEM from Dubna. The dimensions of the system are 200 cm in diameter and 170 cm in length and it supplies a thermal power of 900 MW with keff =0.943, using a 20 mA proton beam of an energy of 1 GeV. Considering the thermal → electricity power and electricity → beam power conversion efficiencies, the electric power amplification is about 8. Energy deposition and neutron energy distribution in the fission core are also studied. Some properties, such as the heat production per unit volume, are rather similar to modern fast breeders. The neutron multiplication factor keff is very sensitive to small changes in the geometrical set-up within the fission core.
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Affiliation(s)
- J.-S. Wan
- Institut für Physikalische Chemie, Kernchemie und Makromolekulare Chemie, Philipps-Universität, Hans Meerweinstr ., D-35032 Marburg Germany
| | - R. Brandt
- Institut für Physikalische Chemie, Kernchemie und Makromolekulare Chemie, Philipps-Universität, Hans Meerweinstr ., D-35032 Marburg Germany
| | - A. N. Sosnin
- Northwest Institute of Nuclear Technology , P.O. Box 69 , Xian , China
| | - M. I. Krivopustov
- Joint Institute for Nuclear Research, Dubna , Moscow Region , Russia
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7
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Rossigalli-Costa N, Cury de Barros F, Cipriano AP, Prado Prandini L, Medeiros de Andrade T, Rothier PS, Lofeu L, Brandt R, Kohlsdorf T. A guide to incubate eggs of Tropidurus lizards under laboratory conditions. J Exp Zool B Mol Dev Evol 2021; 336:576-584. [PMID: 34496131 DOI: 10.1002/jez.b.23095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 07/21/2021] [Accepted: 07/30/2021] [Indexed: 01/11/2023]
Abstract
Studies in Evo-Devo benefit from the use of a variety of organisms, as comparative approaches provide a better understanding of Biodiversity and Evolution. Standardized protocols to incubate eggs and manipulate embryo development enable postulation of additional species as suitable biological systems for research in the field. In the past decades, vertebrate lineages such as Squamata (lizards, snakes, and amphisbaenians) emerged as crucial study systems for addressing topics as diverse as phenotypic evolution and climate change. However, protocols for maintaining gravid females and incubating eggs in the lab under experimental conditions are available to only a few squamate species. This resource article presents a simple incubation guide that standardizes conditions to maintain embryos of Tropidurus catalanensis (Squamata: Tropiduridae) under different experimental conditions, manipulating relevant environmental factors like temperature and humidity. We identified associated effects relating the egg incubation condition to developmental stage, incubation time, hatching success, and resulting morphotypes. Temperature and humidity play a key role in development and require attention when establishing the experimental design. Current literature comprises information for Tropidurus lizards that ponders how general in Squamata are the ecomorphs originally described for Anolis. Studies evaluating phenotypic effects of developmental environments suggest plasticity in some of the traits that characterize the ecomorphological associations described for this family. We expect that this incubation guide encourages future studies using Tropidurus lizards to address Evo-Devo questions.
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Affiliation(s)
- Nathalia Rossigalli-Costa
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil
| | - Fábio Cury de Barros
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil.,Department of Ecology and Evolutionary Biology, ICAQF, Federal University of São Paulo. Rua Prof. Artur Riedel, Diadema, Brazil.,University of the Estate of Minas Gerais (UEMG/Passos). Av. Juca Stockler 1130, Passos, Brazil
| | - Ana Paula Cipriano
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil
| | - Luísa Prado Prandini
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil
| | | | - Priscila S Rothier
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil.,Département Adaptations du Vivant, Muséum National d'Histoire Naturelle, 55 Rue Buffon, Paris, France
| | - Leandro Lofeu
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil.,Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
| | - Renata Brandt
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil.,Science North, Sudbury, Ontario, Canada
| | - Tiana Kohlsdorf
- Department of Biology, FFCLRP, University of São Paulo. Avenida Bandeirantes, Ribeirão Preto, Brazil
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8
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Golshiri K, Ataei Ataabadi E, Rubio-Beltran E, Dutheil S, Yao W, Snyder GL, Davis RE, van der Pluijm I, Brandt R, Van den Berg-Garrelds IM, MaassenVanDenBrink A, de Vries R, Danser AHJ, Roks AJM. Selective Phosphodiesterase 1 Inhibition Ameliorates Vascular Function, Reduces Inflammatory Response, and Lowers Blood Pressure in Aging Animals. J Pharmacol Exp Ther 2021; 378:173-183. [PMID: 34099502 DOI: 10.1124/jpet.121.000628] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/27/2021] [Indexed: 12/23/2022] Open
Abstract
Diminished nitric oxide-cGMP-mediated relaxation plays a crucial role in cardiovascular aging, leading to decreased vasodilation, vascular hypertrophy and stiffening, and ultimately, cardiovascular dysfunction. Aging is the time-related worsening of physiologic function due to complex cellular and molecular interactions, and it is at least partly driven by DNA damage. Genetic deletion of the DNA repair enzyme ERCC1 endonuclease in Ercc1Δ/- mice provides us an efficient tool to accelerate vascular aging, explore mechanisms, and test potential treatments. Previously, we identified the cGMP-degrading enzyme phosphodiesterase 1 as a potential treatment target in vascular aging. In the present study, we studied the effect of acute and chronic treatment with ITI-214, a selective phosphodiesterase 1 inhibitor on vascular aging features in Ercc1Δ/- mice. Compared with wild-type mice, Ercc1Δ/- mice at the age of 14 weeks showed decreased reactive hyperemia, diminished endothelium-dependent and -independent responses of arteries in organ baths, carotid wall hypertrophy, and elevated circulating levels of inflammatory cytokines. Acute ITI-214 treatment in organ baths restored the arterial endothelium-independent vasodilation in Ercc1Δ/- mice. An 8-week treatment with 100 mg/kg per day ITI-214 improved endothelium-independent relaxation in both aorta and coronary arteries, at least partly restored the diminished reactive hyperemia, lowered the systolic and diastolic blood pressure, normalized the carotid hypertrophy, and ameliorated inflammatory responses exclusively in Ercc1Δ/- mice. These findings suggest phosphodiesterase 1 inhibition would provide a powerful tool for nitric oxide-cGMP augmentation and have significant therapeutic potential to battle arteriopathy related to aging. SIGNIFICANCE STATEMENT: The findings implicate the key role of phosphodiesterase 1 in vascular function and might be of clinical importance for the prevention of mortalities and morbidities related to vascular complications during aging, as well as for patients with progeria that show a high risk of cardiovascular disease.
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Affiliation(s)
- Keivan Golshiri
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Ehsan Ataei Ataabadi
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Eloísa Rubio-Beltran
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Sophie Dutheil
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Wei Yao
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Gretchen L Snyder
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Robert E Davis
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Ingrid van der Pluijm
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Renata Brandt
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Ingrid M Van den Berg-Garrelds
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Antoinette MaassenVanDenBrink
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - René de Vries
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - A H Jan Danser
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
| | - Anton J M Roks
- Dept. of Internal Medicine (K.G., E.A.A., E.R.-B., I.M.V.d.B.-G., A.M., R.d.V., A.H.J.D., A.J.M.R.), Dept. of Molecular Genetics (I.v.d.P., R.B.), Dept. of Vascular Surgery (I.v.d.P.), Erasmus Medical Center, Rotterdam, The Netherlands, and Intra-Cellular Therapies, Inc., New York, New York (S.D., W.Y., G.L.S., R.E.D.)
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9
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Sosnin VN, Ochs M, Brandt R, Birkholz W. On some operational limits of accelerator-driven subcritical nuclear reactors / Über die Grenzen einiger Betriebsparameter von unterkritischen Anlagen mit Beschleunigerantrieb. KERNTECHNIK 2021. [DOI: 10.1515/kern-1996-610418] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Lofeu L, Brandt R, Kohlsdorf T. Digit identity matters: origin and evolution of sexual dimorphism in the digit lengths of tropidurid lizards. Biol J Linn Soc Lond 2020. [DOI: 10.1093/biolinnean/blaa088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Sexual dimorphism in digit lengths reflects phenotypic evolution mediated by developmental steroids. Differences in the identity of the sexually-dimorphic digit may evolve if the concentrations of sex-steroid receptors in the digit are easily modified and the initial changes have low impact on fitness. Accordingly, sexual dimorphism in digit lengths might initially originate under neutral selective regimes, being subsequently co-opted by embryonic hormonal effects on sensitive traits that are more likely to be targeted by selection. Correlated variation among sexually-dimorphic traits might therefore reflect pleiotropic hormonal modulation during development. Moreover, the identity and trend of the sexually-dimorphic digit might be evolutionarily labile even among closely-related species. We evaluated this model by assessing the identity of sexually-dimorphic digits among 11 Tropiduridae lizard species and inferring evolutionary patterns of sexual dimorphism. Assuming that digit lengths can be used as a proxy for hormonal modulation of steroid-sensitive traits during development, we tested for evolutionary associations among sexual dimorphism of digit lengths, body size and other traits that may be direct targets of sexual selection in the Tropiduridae. Sexual dimorphism in digit lengths is evolutionarily labile in the Tropiduridae, and diversity, instead of conservatism, seems to rule developmental mechanisms underlying the evolution of sexual dimorphism in digit ratios.
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Affiliation(s)
- Leandro Lofeu
- Department of Biology, FFCLRP, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Renata Brandt
- Department of Biology, FFCLRP, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Science North, Sudbury, ON, Canada
| | - Tiana Kohlsdorf
- Department of Biology, FFCLRP, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
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11
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Golshiri K, Ataei Ataabadi E, Brandt R, van der Pluijm I, de Vries R, Danser AHJ, Roks A. Chronic Sildenafil Treatment Improves Vasomotor Function in a Mouse Model of Accelerated Aging. Int J Mol Sci 2020; 21:ijms21134667. [PMID: 32630010 PMCID: PMC7369923 DOI: 10.3390/ijms21134667] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/17/2020] [Accepted: 06/22/2020] [Indexed: 12/26/2022] Open
Abstract
Aging leads to a loss of vasomotor control. Both vasodilation and vasoconstriction are affected. Decreased nitric oxide–cGMP-mediated relaxation is a hallmark of aging. It contributes to vascular disease, notably hypertension, infarction, and dementia. Decreased vasodilation can be caused by aging independently from cardiovascular risk factors. This process that can be mimicked in mice in an accelerated way by activation of the DNA damage response. Genetic deletion of the DNA repair enzyme ERCC1 endonuclease in mice, as in the case of Ercc1Δ/- mice, can be used as a tool to accelerate aging. Ercc1Δ/- mice develop age-dependent vasomotor dysfunction from two months after birth. In the present study we tested if chronic treatment with sildenafil, a phosphodiesterase 5 inhibitor that augments NO–cGMP signaling, can reduce the development of vasomotor dysfunction in Ercc1Δ/- mice. Ercc1Δ/- mice and wild-type littermates were treated with 10 mg/kg/d of sildenafil from the age of 6 to the age of 14 weeks. Blood pressure and in vivo and ex vivo vasomotor responses were measured at the end of the treatment period. Ercc1Δ/- mice developed decreased reactive hyperemia, and diminished NO–cGMP-dependent acetylcholine responses. The diminished acetylcholine response involved both endothelial and vascular smooth muscle cell signaling. Chronic sildenafil exclusively improved NO–cGMP signaling in VSMC, and had no effect on endothelium-derived hyperpolarization. Sildenafil also improved KCl hypocontractility in Ercc1Δ/- mice. All effects were blood pressure-independent. The findings might be of clinical importance for prevention of morbidities related to vascular aging as well as for progeria patients with a high risk of cardiovascular disease.
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Affiliation(s)
- Keivan Golshiri
- Department of Internal Medicine, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (K.G.); (E.A.A.); (R.d.V.); (A.H.J.D.)
| | - Ehsan Ataei Ataabadi
- Department of Internal Medicine, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (K.G.); (E.A.A.); (R.d.V.); (A.H.J.D.)
| | - Renata Brandt
- Department of Molecular Genetics, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (R.B.); (I.v.d.P.)
| | - Ingrid van der Pluijm
- Department of Molecular Genetics, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (R.B.); (I.v.d.P.)
- Department of Vascular Surgery, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands
| | - René de Vries
- Department of Internal Medicine, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (K.G.); (E.A.A.); (R.d.V.); (A.H.J.D.)
| | - A. H. Jan Danser
- Department of Internal Medicine, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (K.G.); (E.A.A.); (R.d.V.); (A.H.J.D.)
| | - Anton Roks
- Department of Internal Medicine, Erasmus Medical Center, 3015 GD Rotterdam, The Netherlands; (K.G.); (E.A.A.); (R.d.V.); (A.H.J.D.)
- Correspondence:
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12
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Dees A, Wilson K, Reali C, Pruett JE, Hall JM, Brandt R, Warner DA. Communal egg‐laying behaviour and the consequences of egg aggregation in the brown anole (
Anolis sagrei
). Ethology 2020. [DOI: 10.1111/eth.13028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Allison Dees
- Department of Biological Sciences Auburn University Auburn AL USA
| | - Kayla Wilson
- Department of Biological Sciences Auburn University Auburn AL USA
- Department of Biological Sciences University of Alabama at Huntsville Huntsville AL USA
| | - Chanel Reali
- Department of Biological Sciences Auburn University Auburn AL USA
| | - Jenna E. Pruett
- Department of Biological Sciences Auburn University Auburn AL USA
| | - Joshua M. Hall
- Department of Biological Sciences Auburn University Auburn AL USA
| | - Renata Brandt
- Department of Biological Sciences Auburn University Auburn AL USA
- School of the Environment Laurentian University Sudbury ON Canada
- Science North Sudbury ON Canada
| | - Daniel A. Warner
- Department of Biological Sciences Auburn University Auburn AL USA
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13
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Bog M, Xu S, Himmelbach A, Brandt R, Wagner F, Appenroth KJ, Sree KS. Genotyping-by-Sequencing for Species Delimitation in Lemna Section Uninerves Hegelm. (Lemnaceae). The Duckweed Genomes 2020. [DOI: 10.1007/978-3-030-11045-1_11] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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14
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Bonini‐Campos B, Lofeu L, Brandt R, Kohlsdorf T. Different developmental environments reveal multitrait plastic responses in South American Anostomidae fish. J Exp Zool (Mol Dev Evol) 2019; 332:238-244. [DOI: 10.1002/jez.b.22905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 07/17/2019] [Accepted: 07/19/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Bianca Bonini‐Campos
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversidade de São Paulo São Paulo Brazil
| | - Leandro Lofeu
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversidade de São Paulo São Paulo Brazil
| | - Renata Brandt
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversidade de São Paulo São Paulo Brazil
- Science Communication Program, School of the EnvironmentLaurentian University Ontario Canada
| | - Tiana Kohlsdorf
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão PretoUniversidade de São Paulo São Paulo Brazil
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15
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Kazdal D, Allgäuer M, Budczies J, Kriegsmann M, Leichsenring J, Volckmar A, Kirchner M, Neumann O, Brandt R, Rempel E, Tala S, Harms A, Plögler C, Von Winterfeld M, Penzel R, Schirmacher P, Endris V, Stenzinger A. P1.04-13 Delineating Spatial Heterogeneity of Tumor Mutational Burden (TMB) Counts in Pulmonary Adenocarcinoma. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.916] [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: 11/29/2022]
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16
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Simon MN, Brandt R, Kohlsdorf T, Arnold SJ. Bite performance surfaces of three ecologically divergent Iguanidae lizards: relationships with lower jaw bones. Biol J Linn Soc Lond 2019. [DOI: 10.1093/biolinnean/blz067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Traits that interact to perform an ecologically relevant function are expected to be under multivariate non-linear selection. Using the lower jaw morphology as a biomechanical model, we test the hypothesis that lower jaw bones of lizards are subjected to stabilizing and correlational selection, associated with mechanical advantage and maximum bite force. We used three closely related tropidurine species that differ in size, head shape and microhabitat: Eurolophosaurus nanuzae, Tropidurus hispidus and Tropidurus semitaeniatus. We predicted a common pattern of correlational selection on bones that are part of in-levers or part of the out-lever of the lower jaw. The predicted pattern was found in E. nanuzae and T. hispidus, but this could not be shown to be statistically significant. For T. semitaeniatus, we found significant disruptive selection on a contrast involving the surangular, and also significant directional selection on linear combinations of traits in all species. The results indicate that the non-linear selection on lower jaw bones does not reflect an optimum to enhance mechanical advantage in all species. Divergent functional demands and specific ecological contexts of species seem relevant in shaping patterns of selection on morphology.
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Affiliation(s)
- Monique Nouailhetas Simon
- Department of Genetics and Evolutionary Biology, Biosciences Institute, University of São Paulo, Butantã, São Paulo, Brazil
- Department of Integrative Biology, Oregon State University, Corvallis, OR USA
| | - Renata Brandt
- Department of Biology, FFCLRP, University of São Paulo, Monte Alegre, Ribeirão Preto, Brazil
| | - Tiana Kohlsdorf
- Department of Biology, FFCLRP, University of São Paulo, Monte Alegre, Ribeirão Preto, Brazil
| | - Stevan J Arnold
- Department of Integrative Biology, Oregon State University, Corvallis, OR USA
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17
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Citadini JM, Brandt R, Williams CR, Gomes FR. Evolution of morphology and locomotor performance in anurans: relationships with microhabitat diversification. J Evol Biol 2018; 31:371-381. [PMID: 29297953 DOI: 10.1111/jeb.13228] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2017] [Revised: 11/18/2017] [Accepted: 12/17/2017] [Indexed: 11/30/2022]
Abstract
The relationships between morphology, performance, behavior and ecology provide evidence for multiple and complex phenotypic adaptations. The anuran body plan, for example, is evolutionarily conserved and shows clear specializations to jumping performance back at least to the early Jurassic. However, there are instances of more recent adaptation to habit diversity in the post-cranial skeleton, including relative limb length. The present study tested adaptive models of morphological evolution in anurans associated with the diversity of microhabitat use (semi-aquatic arboreal, fossorial, torrent, and terrestrial) in species of anuran amphibians from Brazil and Australia. We use phylogenetic comparative methods to determine which evolutionary models, including Brownian motion (BM) and Ornstein-Uhlenbeck (OU) are consistent with morphological variation observed across anuran species. Furthermore, this study investigated the relationship of maximum distance jumped as a function of components of morphological variables and microhabitat use. We found there are multiple optima of limb lengths associated to different microhabitats with a trend of increasing hindlimbs in torrent, arboreal, semi-aquatic whereas fossorial and terrestrial species evolve toward optima with shorter hindlimbs. Moreover, arboreal, semi-aquatic and torrent anurans have higher jumping performance and longer hindlimbs, when compared to terrestrial and fossorial species. We corroborate the hypothesis that evolutionary modifications of overall limb morphology have been important in the diversification of locomotor performance along the anuran phylogeny. Such evolutionary changes converged in different phylogenetic groups adapted to similar microhabitat use in two different zoogeographical regions.
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Affiliation(s)
- J M Citadini
- Department of Physiology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
| | - R Brandt
- Department of Biology, FFCLRP/USP, Ribeirão Preto, SP, Brazil
| | - C R Williams
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, SA, Australia
| | - F R Gomes
- Department of Physiology, Bioscience Institute, University of São Paulo, São Paulo, SP, Brazil
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18
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Affiliation(s)
- U. Besserer
- Forschungszentrum Karlsruhe GmbH, Tritiumlabor, Postfach3640 D-76021 Karlsruhe, Germany
| | - R.-D. Penzhorn
- Forschungszentrum Karlsruhe GmbH, Tritiumlabor, Postfach3640 D-76021 Karlsruhe, Germany
| | - R. Brandt
- Philipps-Universitat Marburg Hans Meerwein-Straβe D-35032 Marburg, Germany
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19
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Lofeu L, Brandt R, Kohlsdorf T. Phenotypic integration mediated by hormones: associations among digit ratios, body size and testosterone during tadpole development. BMC Evol Biol 2017; 17:175. [PMID: 28768472 PMCID: PMC5541650 DOI: 10.1186/s12862-017-1021-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 03/25/2017] [Accepted: 07/26/2017] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Developmental associations often explain phenotypic integration. The intersected hormonal regulation of ontogenetic processes fosters predictions of steroid-mediated phenotypic integration among sexually dimorphic traits, a statement defied by associations between classical dimorphism predictors (e.g. body size) and traits that apparently lack sex-specific functions (e.g. ratios between the lengths of Digits II and IV - 2D:4D). Developmental bases of female-biased 2D:4D have been identified, but these remain unclear for taxa presenting male-biased 2D:4D (e.g. anura). Here we propose two alternative hypotheses to investigate evolution of male-biased 2D:4D associated with sexually dimorphic body size using Leptodactylus frogs: I)'hypothesis of sex-specific digit responses' - Digit IV would be reactive to testosterone but exhibit responses in the opposite direction of those observed in female-biased 2D:4D lineages, so that Digit IV turns shorter in males; II) 'hypothesis of identity of the dimorphic digit'- Digit II would be the dimorphic digit. RESULTS We compiled the following databases using Leptodactylus frogs: 1) adults of two species from natural populations and 2) testosterone-treated L. fuscus at post-metamorphic stage. Studied traits seem monomorphic in L. fuscus; L. podicipinus exhibits male-biased 2D:4D. When present, 2D:4D dimorphism was male-biased and associated with dimorphic body size; sex differences resided on Digit II instead of IV, corroborating our 'hypothesis of identity of the dimorphic digit'. Developmental steroid roles were validated: testosterone-treated L. fuscus frogs were smaller and exhibited masculinized 2D:4D, and Digit II was the digit that responded to testosterone. CONCLUSION We propose a model where evolution of sexual dimorphism in 2D:4D first originates from the advent, in a given digit, of increased tissue sensitivity to steroids. Phenotypic integration with other sexually dimorphic traits would then occur through multi-trait hormonal effects during development. Such process of phenotypic integration seems fitness-independent in its origin and might explain several cases of steroid-mediated integration among sexually dimorphic traits.
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Affiliation(s)
- Leandro Lofeu
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Renata Brandt
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Tiana Kohlsdorf
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, 14040-901, Brazil.
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20
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Rothier PS, Brandt R, Kohlsdorf T. Ecological associations of autopodial osteology in Neotropical geckos. J Morphol 2017; 278:290-299. [DOI: 10.1002/jmor.20635] [Citation(s) in RCA: 7] [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] [Received: 01/12/2016] [Revised: 09/29/2016] [Accepted: 10/21/2016] [Indexed: 12/28/2022]
Affiliation(s)
- Priscila S. Rothier
- Department of Biology; FFCLRP/USP, Universidade de São Paulo; Ribeirão Preto SP 14040-901 Brazil
| | - Renata Brandt
- Department of Biology; FFCLRP/USP, Universidade de São Paulo; Ribeirão Preto SP 14040-901 Brazil
| | - Tiana Kohlsdorf
- Department of Biology; FFCLRP/USP, Universidade de São Paulo; Ribeirão Preto SP 14040-901 Brazil
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21
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Herrel A, Lopez-Darias M, Vanhooydonck B, Cornette R, Kohlsdorf T, Brandt R. Do Adult Phenotypes Reflect Selection on Juvenile Performance? A Comparative Study on Performance and Morphology in Lizards. Integr Comp Biol 2016; 56:469-78. [DOI: 10.1093/icb/icw010] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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22
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Visser WE, Bombardieri CR, Zevenbergen C, Barnhoorn S, Ottaviani A, van der Pluijm I, Brandt R, Kaptein E, van Heerebeek R, van Toor H, Garinis GA, Peeters RP, Medici M, van Ham W, Vermeij WP, de Waard MC, de Krijger RR, Boelen A, Kwakkel J, Kopchick JJ, List EO, Melis JPM, Darras VM, Dollé MET, van der Horst GTJ, Hoeijmakers JHJ, Visser TJ. Tissue-Specific Suppression of Thyroid Hormone Signaling in Various Mouse Models of Aging. PLoS One 2016; 11:e0149941. [PMID: 26953569 PMCID: PMC4783069 DOI: 10.1371/journal.pone.0149941] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 03/04/2015] [Accepted: 02/07/2016] [Indexed: 01/24/2023] Open
Abstract
DNA damage contributes to the process of aging, as underscored by premature aging syndromes caused by defective DNA repair. Thyroid state changes during aging, but underlying mechanisms remain elusive. Since thyroid hormone (TH) is a key regulator of metabolism, changes in TH signaling have widespread effects. Here, we reveal a significant common transcriptomic signature in livers from hypothyroid mice, DNA repair-deficient mice with severe (Csbm/m/Xpa-/-) or intermediate (Ercc1-/Δ-7) progeria and naturally aged mice. A strong induction of TH-inactivating deiodinase D3 and decrease of TH-activating D1 activities are observed in Csbm/m/Xpa-/- livers. Similar findings are noticed in Ercc1-/Δ-7, in naturally aged animals and in wild-type mice exposed to a chronic subtoxic dose of DNA-damaging agents. In contrast, TH signaling in muscle, heart and brain appears unaltered. These data show a strong suppression of TH signaling in specific peripheral organs in premature and normal aging, probably lowering metabolism, while other tissues appear to preserve metabolism. D3-mediated TH inactivation is unexpected, given its expression mainly in fetal tissues. Our studies highlight the importance of DNA damage as the underlying mechanism of changes in thyroid state. Tissue-specific regulation of deiodinase activities, ensuring diminished TH signaling, may contribute importantly to the protective metabolic response in aging.
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Affiliation(s)
- W. Edward Visser
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
- * E-mail:
| | - Cíntia R. Bombardieri
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Chantal Zevenbergen
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Sander Barnhoorn
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Alexandre Ottaviani
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
- Institute for Research on Cancer and Aging, Nice (IRCAN), UMR 7284 CNRS U1081 INSERM UNS, 28 avenue de Valombrose Faculté de Médecine, Nice, France
| | - Ingrid van der Pluijm
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Renata Brandt
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Ellen Kaptein
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Hans van Toor
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - George A. Garinis
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Robin P. Peeters
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Marco Medici
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Willy van Ham
- Laboratory of Comparative Endocrinology, Biology Department, KULeuven, Leuven, Belgium
| | - Wilbert P. Vermeij
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Monique C. de Waard
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Anita Boelen
- Dept of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, The Netherlands
| | - Joan Kwakkel
- Dept of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, The Netherlands
| | - John J. Kopchick
- Dept of Biomedical Sciences, Edison Biotechnology Institute, Ohio University, Athens, Ohio, United States of America
| | - Edward O. List
- Dept of Biomedical Sciences, Edison Biotechnology Institute, Ohio University, Athens, Ohio, United States of America
| | - Joost P. M. Melis
- Dept of Toxicogenetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Veerle M. Darras
- Laboratory of Comparative Endocrinology, Biology Department, KULeuven, Leuven, Belgium
| | - Martijn E. T. Dollé
- Centre for Health Protection Research, National Institute of Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | | | - Jan H. J. Hoeijmakers
- MGC Dept of Genetics, Cancer Genomics Center, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Theo J. Visser
- Dept of Internal Medicine, Erasmus Medical Center, Rotterdam, The Netherlands
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23
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Brandt R, de Barros FC, Noronha C, Tulli MJ, Kohlsdorf T. Sexual differences in locomotor performance inTropidurus catalanensislizards (Squamata: Tropiduridae) - body shape, size and limb musculature explain variation between males and females. Biol J Linn Soc Lond 2016. [DOI: 10.1111/bij.12760] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Renata Brandt
- Departamento de Biologia; Faculdade de Filosofia Ciências e Letras de Ribeirão Preto; Universidade de São Paulo; Ribeirão Preto-SP Brazil
| | - Fabio Cury de Barros
- Departamento de Biologia; Faculdade de Filosofia Ciências e Letras de Ribeirão Preto; Universidade de São Paulo; Ribeirão Preto-SP Brazil
| | - Carolina Noronha
- Departamento de Biologia; Faculdade de Filosofia Ciências e Letras de Ribeirão Preto; Universidade de São Paulo; Ribeirão Preto-SP Brazil
| | - Maria Jose Tulli
- UnidadEjecutoraLillo- CONICET; Instituto de Herpetología-Fundación Miguel Lillo; Tucumán Argentina
| | - Tiana Kohlsdorf
- Departamento de Biologia; Faculdade de Filosofia Ciências e Letras de Ribeirão Preto; Universidade de São Paulo; Ribeirão Preto-SP Brazil
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24
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Affiliation(s)
- R. Brandt
- Department of Biology; FFCLRP; University of São Paulo; Ribeirão Preto Sao Paulo Brazil
| | - F. Galvani
- Department of Biology; FFCLRP; University of São Paulo; Ribeirão Preto Sao Paulo Brazil
| | - T. Kohlsdorf
- Department of Biology; FFCLRP; University of São Paulo; Ribeirão Preto Sao Paulo Brazil
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25
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Bisanzo M, Brandt R, Kisoke T, Kyomugisha F, Arthur A, Thomas S. 13 Ketamine Use in a Resource-Limited Setting: Continued Safety in a Maturing African Non-Physician Clinician System. Ann Emerg Med 2014. [DOI: 10.1016/j.annemergmed.2014.07.038] [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: 11/17/2022]
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26
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Perelygin V, Abdullaev I, Bondar Y, Brandt R, Chuburkov Y, Knyazeva G, Kravets L, Spohr R, Vater P. On Search and Identification of Fossil Tracks dne to Superheavy Cosmic Ray Nuclei (Z ≥ 110) in Meteoritic Crystals. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | | | - Yu.V. Bondar
- Ukraine State Scientific Centre on Environmental Radio geochemistry, Kiev, Ukraine
| | - R. Brandt
- Philipps University, Kernchemie, Marburg, Germany
| | | | | | - L.I. Kravets
- Joint Institute for Nuclear Research, Dubna, Russia
| | - R. Spohr
- Philipps University, Kernchemie, Marburg, Germany
| | - P. Vater
- Philipps University, Kernchemie, Marburg, Germany
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27
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Adam J, Balabekyan A, Brandt R, Barashenkov V, Dzhelepov V, Filinova V, Gustov S, Kalinnikov V, Krivopustov M, Mirokhin I, Mrazek J, Odoj R, Pronskikh V, Savchenko O, Sosnin A, Solnyshkin A, Lstegailov V, Tsoupko-Sitnikov V. Investigation of the Formation of Residual Nuclei in Reactions Induced by 660 MeV Protons Interacting with the Radioactive237Np,241Am and129I Targets. J NUCL SCI TECHNOL 2014. [DOI: 10.1080/00223131.2002.10875092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Raj DDA, Jaarsma D, Holtman IR, Olah M, Ferreira FM, Schaafsma W, Brouwer N, Meijer MM, de Waard MC, van der Pluijm I, Brandt R, Kreft KL, Laman JD, de Haan G, Biber KPH, Hoeijmakers JHJ, Eggen BJL, Boddeke HWGM. Priming of microglia in a DNA-repair deficient model of accelerated aging. Neurobiol Aging 2014; 35:2147-60. [PMID: 24799273 DOI: 10.1016/j.neurobiolaging.2014.03.025] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2013] [Revised: 03/21/2014] [Accepted: 03/23/2014] [Indexed: 12/16/2022]
Abstract
Aging is associated with reduced function, degenerative changes, and increased neuroinflammation of the central nervous system (CNS). Increasing evidence suggests that changes in microglia cells contribute to the age-related deterioration of the CNS. The most prominent age-related change of microglia is enhanced sensitivity to inflammatory stimuli, referred to as priming. It is unclear if priming is due to intrinsic microglia ageing or induced by the ageing neural environment. We have studied this in Ercc1 mutant mice, a DNA repair-deficient mouse model that displays features of accelerated aging in multiple tissues including the CNS. In Ercc1 mutant mice, microglia showed hallmark features of priming such as an exaggerated response to peripheral lipopolysaccharide exposure in terms of cytokine expression and phagocytosis. Specific targeting of the Ercc1 deletion to forebrain neurons resulted in a progressive priming response in microglia exemplified by phenotypic alterations. Summarizing, these data show that neuronal genotoxic stress is sufficient to switch microglia from a resting to a primed state.
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Affiliation(s)
- Divya D A Raj
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Dick Jaarsma
- Department of Neuroscience, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Inge R Holtman
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Marta Olah
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Filipa M Ferreira
- Department of Neuroscience, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Wandert Schaafsma
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Nieske Brouwer
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Michel M Meijer
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Monique C de Waard
- Department of Genetics, Cancer Genomics Center, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Ingrid van der Pluijm
- Department of Genetics, Cancer Genomics Center, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Renata Brandt
- Department of Genetics, Cancer Genomics Center, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Karim L Kreft
- Department of Immunology, Erasmus University Medical Center and MS Center ErasMS, Rotterdam, the Netherlands; Department of Neurology, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Jon D Laman
- Department of Immunology, Erasmus University Medical Center and MS Center ErasMS, Rotterdam, the Netherlands
| | - Gerald de Haan
- Department of Cell Biology, European Research Institute on the Biology of Aging, University of Groningen, University Medical Center, Groningen, the Netherlands
| | - Knut P H Biber
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands; Department of Psychiatry and Psychotherapy, University Medical Center, Freiburg, Germany
| | - Jan H J Hoeijmakers
- Department of Genetics, Cancer Genomics Center, Erasmus University Medical Center, Rotterdam, the Netherlands
| | - Bart J L Eggen
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Hendrikus W G M Boddeke
- Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
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Vermeij W, de Waard MC, Brandt R, Jaarsma D, Elgersma Y, Tyrelle, G, Bossers K, Wirz K, Swagemakers S, van der Pluijm I, Hoeijmakers JH. Neurodegeneration in accelerated ageing mouse models. Exp Gerontol 2013. [DOI: 10.1016/j.exger.2013.05.017] [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: 10/26/2022]
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30
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Gruzelier JH, Thompson T, Redding E, Brandt R, Steffert T. Application of alpha/theta neurofeedback and heart rate variability training to young contemporary dancers: state anxiety and creativity. Int J Psychophysiol 2013; 93:105-11. [PMID: 23684733 DOI: 10.1016/j.ijpsycho.2013.05.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 04/09/2013] [Accepted: 05/08/2013] [Indexed: 01/08/2023]
Abstract
As one in a series on the impact of EEG-neurofeedback in the performing arts, we set out to replicate a previous dance study in which alpha/theta (A/T) neurofeedback and heart rate variability (HRV) biofeedback enhanced performance in competitive ballroom dancers compared with controls. First year contemporary dance conservatoire students were randomised to the same two psychophysiological interventions or a choreology instruction comparison group or a no-training control group. While there was demonstrable neurofeedback learning, there was no impact of the three interventions on dance performance as assessed by four experts. However, HRV training reduced anxiety and the reduction correlated with improved technique and artistry in performance; the anxiety scale items focussed on autonomic functions, especially cardiovascular activity. In line with the putative impact of hypnogogic training on creativity A/T training increased cognitive creativity with the test of unusual uses, but not insight problems. Methodological and theoretical implications are considered.
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Affiliation(s)
- J H Gruzelier
- Department of Psychology, Goldsmiths, University of London, London, UK.
| | - T Thompson
- Department of Psychology, Goldsmiths, University of London, London, UK
| | - E Redding
- Trinity/Laban Conservatoire of Music and Dance, London, UK
| | - R Brandt
- Trinity/Laban Conservatoire of Music and Dance, London, UK
| | - T Steffert
- Department of Psychology, Goldsmiths, University of London, London, UK
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Abstract
Abstract
In 1971 evidence for the production of element 112 via secondary reactions in CERN W targets was obtained. The evidence was mainly based on the observation of fission fragments in Hg sources separated from the W targets, on the measured masses of the fissioning nuclei and on the assumption that element 112 (Eka-Hg) actually behaves like Hg in the chemical separation process. This assumption is analyzed in view of recent relativistic calculations of the electronic structure of element 112. It is shown that in the superheavy element region only the chemistry of element 112 is similar to that of Hg.
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Affiliation(s)
- D. Kolb
- Department of Physics, University Kassel, D-34109 Kassel, Germany, E-mail:
| | - A. Marinov
- The Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - G. W. A. Newton
- Heron's Reach, 382 Mossy Lea Road, Wrightington, Lancashire, WN6 9RZ UK
| | - R. Brandt
- Kernchemie, Philipps University, D-35041 Marburg, Germany
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Abstract
Abstract
There are two independent claims for the discovery of element 112: The claim by Hofmann et al. from 1996 and the older claim from 1971 by Marinov et al. This Comment will not challenge the experimental results of Hofmann et al., but it will discuss one aspect of the claimed discovery of element 112 by Marinov et al., as their experiment has never been reproduced in exactly the form in which the original experiment has been carried out. The reasons for this deficiency may not be found in the field of science, but possibly in radioprotection restrictions for researchers who want to carry out such an experiment. However, such is not a sufficient reason to exclude the original claim from all considerations of the responsible international authorities, who have to settle such priority questions. It may be in agreement with scientific traditions, that when the responsible international committees do not feel to be able to come to a positive decision on the “1971” claim, they could keep the priority problem unsettled for the time being.
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Abstract
Abstract
Accelerator Driven Systems (ADS) are an old technological idea: Relativistic proton accelerators deliver their beams onto massive heavy element targets, thus producing abundant neutron fluences. Placing this target into sub-critical nuclear fission assemblies is yielding substantial fission reactions, thus additional fission energy (Rubbia called such a system “Energy Amplifier”). This technology has recently attracted considerable attention due to advances in the construction of powerful accelerators. It allows the safe and cheap production of nuclear energy simultaneously with the destruction (Transmutation) of long lived radioactive waste, in particular plutonium and other minor actinides (neptunium and americium). The principles and the present-state-of-the-art are described, including first experiments to transmute plutonium this way. This technology needs, however, many more years of further “research and development” before large scale ADS's can be constructed. It may be even necessary to investigate the question, if all basic physics phenomena of this technology are already sufficiently well understood.
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Affiliation(s)
- R. Brandt
- Kernchemie, Fachbereich Chemie, Philipps-Universität, 35032 Marburg, Germany. Corresponding author:
| | - W. Birkholz
- Umweltministerium Mecklenburg-Vorpommern, Abteilung Reaktorsicherheit und Strahlenschutz, 19058 Schwerin, Germany
| | - I. A. Shelaev
- Laboratory for High Energies, Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation
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34
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Ju L, Wing J, Taylor E, Brandt R, Slijepcevic P, Horsch M, Rathkolb B, Rácz I, Becker L, Hans W, Adler T, Beckers J, Rozman J, Klingenspor M, Wolf E, Zimmer A, Klopstock T, Busch DH, Gailus-Durner V, Fuchs H, de Angelis MH, van der Horst G, Lehmann AR. SMC6 is an essential gene in mice, but a hypomorphic mutant in the ATPase domain has a mild phenotype with a range of subtle abnormalities. DNA Repair (Amst) 2013; 12:356-66. [PMID: 23518413 DOI: 10.1016/j.dnarep.2013.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 02/05/2013] [Accepted: 02/16/2013] [Indexed: 01/08/2023]
Abstract
Smc5-6 is a highly conserved protein complex related to cohesin and condensin involved in the structural maintenance of chromosomes. In yeasts the Smc5-6 complex is essential for proliferation and is involved in DNA repair and homologous recombination. siRNA depletion of genes involved in the Smc5-6 complex in cultured mammalian cells results in sensitivity to some DNA damaging agents. In order to gain further insight into its role in mammals we have generated mice mutated in the Smc6 gene. A complete knockout resulted in early embryonic lethality, demonstrating that this gene is essential in mammals. However, mutation of the highly conserved serine-994 to alanine in the ATP hydrolysis motif in the SMC6 C-terminal domain, resulted in mice with a surprisingly mild phenotype. With the neo gene selection marker in the intron following the mutation, resulting in reduced expression of the SMC6 gene, the mice were reduced in size, but fertile and had normal lifespans. When the neo gene was removed, the mice had normal size, but detailed phenotypic analysis revealed minor abnormalities in glucose tolerance, haematopoiesis, nociception and global gene expression patterns. Embryonic fibroblasts derived from the ser994 mutant mice were not sensitive to killing by a range of DNA damaging agents, but they were sensitive to the induction of sister chromatid exchanges induced by ultraviolet light or mitomycin C. They also accumulated more oxidative damage than wild-type cells.
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Affiliation(s)
- Limei Ju
- Genome Damage and Stability Centre, University of Sussex, Falmer, Brighton BN1 9RQ, UK
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35
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Borger J, Hashemi-Nezhad S, Alexiev D, Brandt R, Westmeier W, Thomauske B, Kadykov M, Tiutiunnikov S. Fission of 209Bi, natPb and 197Au in the particle field of a fast accelerator driven system. ANN NUCL ENERGY 2013. [DOI: 10.1016/j.anucene.2012.07.029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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36
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Affiliation(s)
- R. Brandt
- Departamento de Fisiologia; Instituto de Biociências; Universidade de São Paulo; São Paulo Brazil
| | - C. A. Navas
- Departamento de Fisiologia; Instituto de Biociências; Universidade de São Paulo; São Paulo Brazil
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37
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Fragopoulou M, Manolopoulou M, Stoulos S, Golovatyuk S, Krivopustov M, Sosnin A, Westmeier W, Brandt R, Debeauvais M, Zamani Valasiadou M. Erratum to “On the behavior of spallation neutrons from extended Pb targets plus moderator: A comparison between SSNTDs measurements and calculation.” [Radiation Measurements 40 (2005) 460–462]. RADIAT MEAS 2013. [DOI: 10.1016/j.radmeas.2012.06.023] [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: 11/29/2022]
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38
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Durik M, Kavousi M, van der Pluijm I, Isaacs A, Cheng C, Verdonk K, Loot AE, Oeseburg H, Bhaggoe UM, Leijten F, van Veghel R, de Vries R, Rudez G, Brandt R, Ridwan YR, van Deel ED, de Boer M, Tempel D, Fleming I, Mitchell GF, Verwoert GC, Tarasov KV, Uitterlinden AG, Hofman A, Duckers HJ, van Duijn CM, Oostra BA, Witteman JCM, Duncker DJ, Danser AHJ, Hoeijmakers JH, Roks AJM. Nucleotide excision DNA repair is associated with age-related vascular dysfunction. Circulation 2012; 126:468-78. [PMID: 22705887 DOI: 10.1161/circulationaha.112.104380] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [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: 12/17/2022]
Abstract
BACKGROUND Vascular dysfunction in atherosclerosis and diabetes mellitus, as observed in the aging population of developed societies, is associated with vascular DNA damage and cell senescence. We hypothesized that cumulative DNA damage during aging contributes to vascular dysfunction. METHODS AND RESULTS In mice with genomic instability resulting from the defective nucleotide excision repair genes ERCC1 and XPD (Ercc1(d/-) and Xpd(TTD) mice), we explored age-dependent vascular function compared with that in wild-type mice. Ercc1(d/-) mice showed increased vascular cell senescence, accelerated development of vasodilator dysfunction, increased vascular stiffness, and elevated blood pressure at a very young age. The vasodilator dysfunction was due to decreased endothelial nitric oxide synthase levels and impaired smooth muscle cell function, which involved phosphodiesterase activity. Similar to Ercc1(d/-) mice, age-related endothelium-dependent vasodilator dysfunction in Xpd(TTD) animals was increased. To investigate the implications for human vascular disease, we explored associations between single-nucleotide polymorphisms of selected nucleotide excision repair genes and arterial stiffness within the AortaGen Consortium and found a significant association of a single-nucleotide polymorphism (rs2029298) in the putative promoter region of DDB2 gene with carotid-femoral pulse wave velocity. CONCLUSIONS Mice with genomic instability recapitulate age-dependent vascular dysfunction as observed in animal models and in humans but with an accelerated progression compared with wild-type mice. In addition, we found associations between variations in human DNA repair genes and markers for vascular stiffness, which is associated with aging. Our study supports the concept that genomic instability contributes importantly to the development of cardiovascular disease.
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Affiliation(s)
- Matej Durik
- Division of Vascular Medicine and Pharmacology, Department of Internal Medicine, Erasmus Medical Center Rotterdam, Dr Molewaterplein 50, 3015 GE Rotterdam, Netherlands
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39
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Borger J, Hashemi-Nezhad S, Alexiev D, Brandt R, Westmeier W, Thomauske B, Tiutiunikov S, Kadykov M, Pronskikh V, Adam J. Studies of the neutron field of the Energy plus Transmutation set-up under 4 GeV deuteron irradiation. RADIAT MEAS 2011. [DOI: 10.1016/j.radmeas.2011.04.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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40
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Hundelt M, Fath T, Selle K, Oesterwind K, Jordan J, Schultz C, Götz J, von Engelhardt J, Monyer H, Lewejohann L, Sachser N, Bakota L, Brandt R. Altered phosphorylation but no neurodegeneration in a mouse model of tau hyperphosphorylation. Neurobiol Aging 2011; 32:991-1006. [DOI: 10.1016/j.neurobiolaging.2009.06.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 06/10/2009] [Accepted: 06/27/2009] [Indexed: 01/16/2023]
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Abstract
The study of life history variation is central to the evolutionary theory. In many ectothermic lineages, including lizards, life history traits are plastic and relate to several sources of variation including body size, which is both a factor and a life history trait likely to modulate reproductive parameters. Larger species within a lineage, for example tend to be more fecund and have larger clutch size, but clutch size may also be influenced by climate, independently of body size. Thus, the study of climatic effects on lizard fecundity is mandatory on the current scenario of global climatic change. We asked how body and clutch size have responded to climate through time in a group of tropical lizards, the Tropidurinae, and how these two variables relate to each other. We used both traditional and phylogenetic comparative methods. Body and clutch size are variable within Tropidurinae, and both traits are influenced by phylogenetic position. Across the lineage, species which evolved larger size produce more eggs and neither trait is influenced by temperature components. A climatic component of precipitation, however, relates to larger female body size, and therefore seems to exert an indirect relationship on clutch size. This effect of precipitation on body size is likely a correlate of primary production. A decrease in fecundity is expected for Tropidurinae species on continental landmasses, which are predicted to undergo a decrease in summer rainfall.
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Affiliation(s)
- Renata Brandt
- Departamento de Fisiologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil.
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42
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Hashemi-Nezhad S, Westmeier W, Zamani-Valasiadou M, Thomauske B, Brandt R. Optimal ion beam, target type and size for accelerator driven systems: Implications to the associated accelerator power. ANN NUCL ENERGY 2011. [DOI: 10.1016/j.anucene.2010.12.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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43
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Dredge K, Hammond E, Handley P, Gonda TJ, Smith MT, Vincent C, Brandt R, Ferro V, Bytheway I. PG545, a dual heparanase and angiogenesis inhibitor, induces potent anti-tumour and anti-metastatic efficacy in preclinical models. Br J Cancer 2011; 104:635-42. [PMID: 21285983 PMCID: PMC3049593 DOI: 10.1038/bjc.2011.11] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [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: 01/04/2023] Open
Abstract
Background: PG545 is a heparan sulfate (HS) mimetic that inhibits tumour angiogenesis by sequestering angiogenic growth factors in the extracellular matrix (ECM), thus limiting subsequent binding to receptors. Importantly, PG545 also inhibits heparanase, the only endoglycosidase which cleaves HS chains in the ECM. The aim of the study was to assess PG545 in various solid tumour and metastasis models. Methods: The anti-angiogenic, anti-tumour and anti-metastatic properties of PG545 were assessed using in vivo angiogenesis, solid tumour and metastasis models. Pharmacokinetic (PK) data were also generated in tumour-bearing mice to gain an understanding of optimal dosing schedules and regimens. Results: PG545 was shown to inhibit angiogenesis in vivo and induce anti-tumour or anti-metastatic effects in murine models of breast, prostate, liver, lung, colon, head and neck cancers and melanoma. Enhanced anti-tumour activity was also noted when used in combination with sorafenib in a liver cancer model. PK data revealed that the half-life of PG545 was relatively long, with pharmacologically relevant concentrations of radiolabeled PG545 observed in liver tumours. Conclusion: PG545 is a new anti-angiogenic clinical candidate for cancer therapy. The anti-metastatic property of PG545, likely due to the inhibition of heparanase, may prove to be a critical attribute as the compound enters phase I clinical trials.
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Affiliation(s)
- K Dredge
- Progen Pharmaceuticals Ltd, 16 Benson Street, Toowong, Brisbane, QLD 4066, Australia.
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Fanara P, Husted KH, Selle K, Wong PYA, Banerjee J, Brandt R, Hellerstein MK. Changes in microtubule turnover accompany synaptic plasticity and memory formation in response to contextual fear conditioning in mice. Neuroscience 2010; 168:167-78. [PMID: 20332016 DOI: 10.1016/j.neuroscience.2010.03.031] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 03/01/2010] [Accepted: 03/15/2010] [Indexed: 11/19/2022]
Abstract
Synaptic plasticity plays a crucial role in learning, memory, and cognitive disorders. Cytoskeletal reorganization underlies neuronal synaptic plasticity, but little is known about the regulation of cytoskeletal dynamics in living animals. We used stable isotope labeling to measure the turnover of tubulin in defined microtubule (MT) populations in murine brain. Neuronal MTs generally exhibited low turnover rates in vivo. Basal turnover was highest in tau-associated MTs, intermediate in microtubule-associated protein 2 (MAP2)-associated MTs, and lowest in cold-stable MTs. Labeling of MTs in mature neurons in cell culture yielded similar turnover results. Intracerebroventricular glutamate injection stimulated, via N-methyl-D-aspartic acid receptors, label incorporation (turnover) in cold-stable, tau-associated, and MAP2-associated MTs, the last of which was shown to be dependent on cyclic adenosine-3', 5'-monophosphorothioate-protein kinase A. Contextual fear conditioning, a hippocampus-mediated form of memory formation, was accompanied by increased turnover of hippocampal MAP2-associated and cold-stable MTs. Treatment with the MT-depolymerizing drug nocodazole reversed the conditioning-induced increase in label incorporation in MAP2-associated MTs, reduced dendritic spine density, and impaired memory formation. The effects of nocodazole on MT turnover were prevented by the MT-stabilizing agent Taxol (Sigma-Aldrich, St. Louis, MO, USA) and by brain-derived nerve growth factor, both of which also restored dendritic spine density and memory formation in this model. In conclusion, these results suggest that changes in hippocampal MT turnover are required for, and are a biomarker of, the synaptic plasticity that is involved in memory formation.
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Affiliation(s)
- P Fanara
- KineMed, Inc., 5980 Horton Street, Suite 400, Emeryville, CA 94608, USA
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Ensinger W, Sudowe R, Brandt R, Neumann R. Gas separation in nanoporous membranes formed by etching ion irradiated polymer foils. Radiat Phys Chem Oxf Engl 1993 2010. [DOI: 10.1016/j.radphyschem.2009.08.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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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Katz J, Brandt R, McHugh T, Dhamankar M, Denshaw-Burke M. Socioeconomic Factors Influencing BRCA 1/2 Mutation Carriers To Choose Risk Reduction Surgery in Community Cancer Genetics Program. Cancer Res 2009. [DOI: 10.1158/0008-5472.sabcs-09-4076] [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] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Mutations in the BRCA 1/2 genes predispose women to increased risk of breast and ovarian cancer. Prophylactic mastectomy (PM) reduces the risk of breast cancer by approximately 90% while prophylactic salpingo-oophorectomy (PSO) reduces the risk of both breast and ovarian cancer. Yet, there is a paucity of data to determine if mutation carriers avail themselves of these risk reducing surgeries in the community setting.Purpose: This study evaluates if particular socioeconomic factors influence BRCA 1/2 mutation carriers to elect risk reduction surgery (RRS), either PM or PSO or both.Method: Of 129 BRCA1/2 positive patients identified by a community-based cancer genetics program outside Philadelphia from 1998 to 2008, 44 were excluded due to personal history of ovarian cancer, loss of follow-up, male gender, or deceased status. The 85 remaining patients were asked to complete a questionnaire addressing: age at diagnosis, ethnicity, religion, parity, education level, marital status, occupation, number of first degree relatives with breast or ovarian cancer, personal history of breast cancer, and use of oral contraceptives, tobacco, and alcohol. A chart review was performed on all responders.Results: Forty-nine patients (58%) completed the questionnaire. Of these, 68% (34/49) had RRS. Of those who did not have RRS, 63% (10/15) stated they definitely plan for RRS in the future. More than half of the women planning RRS in the future (6/10) were younger than 30 years old. Therefore, of all responders, 90% (44/49) stated they had or definitely plan to have RRS. The mean age of women with RRS versus those without was 43.9 and 35.6 years, respectively (p=.0102). Women age 40-64 had the highest rate of RRS (26/34; 84%; p=0.004). Most women (88%) with RRS had children (30/34; p=0.0493). Sixty-five percent (32/49) of women responders were college graduates; 24% were high school graduates (12/49). Of women who had RRS, 68% were college graduates. College graduates age > 40 were the group most likely to have RRS (17/18; 94%; p= .00029). Only 63% of high school graduates age > 40 (5/8; p=1.0) had RRS. Eight-five percent (11/13) of Ashkenazi Jewish women had RRS versus 67% (18/27) of non-Jewish Caucasian women. This was not statistically significant (p=0.2925). There was also no statistical difference for women choosing RRS with respect to occupation, birth control pill use, history of breast cancer, or family history of breast or ovarian cancer. Only 3/49 smoked cigarettes (>more than 1 pack per week) and none drank alcohol (>1 drink/day).Discussion: Women who presented to this community based genetics program had a high rate of RRS, were likely to be college educated, non-smokers, and non-drinkers. Age older than 40, completion of child bearing, and attainment of a college degree were the most significant factors associated with BRCA 1/2 mutation carriers having RRS. Further studies should explore barriers to genetic testing services, as well as evaluate reasons why BRCA1/2 mutation carriers decline RRS.
Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 4076.
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Brandt R, Westmeier W, Odoj R, Adam J, Adloff JC, Balabekyan A, Barabanov MY, Bradnova V, Chaloun P, Debeauvais M. Transmutation of 239Pu and other nuclides using spallation neutrons produced by relativistic protons reacting with massive U- and Pb-targets. RADIOCHIM ACTA 2009. [DOI: 10.1524/ract.2002.90.8_2002.431] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Summary
Experimental studies on the transmutation of some long-lived radioactive waste nuclei, such as 129I, 237Np, and 239Pu, as well as on natural uranium and lanthanum were carried out at the Synchrophastron of the Laboratory for High Energies at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. The radioactive targets (I, Np and Pu) were contained in weld-sealed aluminium holders produced by the Institute of Physics and Power Engineering, Obninsk, Russia. Spallation neutrons were produced by relativistic protons with energies in the range of 0.5 GeV≤E
p≤1.5 GeV interacting with 20 cm long uranium or lead target stacks. The metallic targets were surrounded by 6 cm thick paraffin moderators. The uranium and lanthanum samples were positioned on the outside of the moderator surface and typically contained approximately 0.5 to 1.0 gram of uranium or lanthanum. The highest fluence of spallation neutrons was observed in the region of 5 to 10 cm downstream the entrance of the primary beam into the metallic target, rather independent of the target material or the proton energy. The results obtained by nuclear chemistry methods were supplemented by SSNTD (Solid State Nuclear Track Detector) studies. Consistent and systematic results of B-values and spectral distributions for neutrons have been found. From the experimentally observed transmutation rates one can extrapolate that in a subcritical nuclear power assembly (or "energy amplifier") using a 10 mA proton beam of 1 GeV onto a Pb-target as used here, one can transmute within one month in one gram of sample about 3 mg 129I, 21 mg 237Np, 3.3 mg 238U, and 200 mg 239Pu. Rather similar results have been found by another group for 129I and 239Pu. Observations show that the transmutation rates increase almost linearly with the proton energy in the energy interval 0.5 GeV up to 7.4 GeV. These findings are largely confirmed by model calculations using the LAHET- and DCM/CEM-codes.
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Abstract
Since their first description by Ramon y Cajal at the end of the 19th century, dendritic spines have been proposed as important sites of neuronal contacts and it has been suggested that changes in the activity of neurons directly affect spine morphology. In fact, since then it has been shown that about 90% of excitatory synapses end on spines. Recent data indicate that spines are highly dynamic structures and that spine shape correlates with the strength of synaptic transmission. Furthermore, several mental disorders including Alzheimer's disease (AD) are associated with spine pathology suggesting that spine alterations play a central role in mental deficits. The aim of this review is to provide an overview about the current knowledge on spine morphology and function as well as about different experimental models to analyze spine changes and dynamics. The second part concentrates on disease-relevant factors that are associated with AD and which lead to spine alterations. In particular, data that provide evidence that Abeta oligomers or fibrillar Abeta deposits influence spine morphology and function will be presented and the contribution of tau pathology will be discussed. The review ends with the discussion of potential mechanisms how disease-relevant factors influence dendritic spines and whether and how spine changes could be therapeutically suppressed or reversed.
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Affiliation(s)
- C Tackenberg
- Department of Neurobiology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
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Krievins D, Brandt R, Hawser S, Hadvary P, Islam K. Multicenter, randomized study of the efficacy and safety of intravenous iclaprim in complicated skin and skin structure infections. Antimicrob Agents Chemother 2009; 53:2834-40. [PMID: 19414572 PMCID: PMC2704699 DOI: 10.1128/aac.01383-08] [Citation(s) in RCA: 28] [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] [Subscribe] [Scholar Register] [Received: 10/15/2008] [Revised: 12/29/2008] [Accepted: 04/29/2009] [Indexed: 01/22/2023] Open
Abstract
Iclaprim is a novel antibacterial agent that is currently in development for the treatment of complicated skin and skin structure infections (cSSSI). Iclaprim specifically and selectively inhibits bacterial dihydrofolate reductase, a critical enzyme in the bacterial folate pathway, and exhibits an extended spectrum of activity against various resistant pathogens, including methicillin (meticillin)-resistant Staphylococcus aureus (MRSA). The objective of this randomized, double-blind phase II study was to compare the efficacy and safety of iclaprim to those of vancomycin in patients with cSSSI. Patients were randomized to receive 0.8 mg iclaprim/kg of body weight, 1.6 mg/kg iclaprim, or 1 g vancomycin twice a day for 10 days. Clinical cure rates for the 0.8- and 1.6-mg/kg-iclaprim treatment groups were comparable to that for the vancomycin treatment group (26/28 patients [92.9%], 28/31 patients [90.3%], and 26/28 patients [92.9%], respectively). Iclaprim also showed high microbiological eradication rates. Iclaprim exhibited an eradication rate of 80% and 72% versus 59% observed with vancomycin for S. aureus, the pathogen most frequently isolated at baseline. Five MRSA cases were observed, four in the 0.8-mg/kg-iclaprim arm and one in the vancomycin arm, and all were both clinically and microbiologically cured. Iclaprim exhibited a safety profile similar to that of vancomycin, an established drug for the treatment of cSSSI. Results from this study indicate that iclaprim is a promising new therapy for the treatment of cSSSI, in particular those caused by S. aureus, including MRSA.
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Affiliation(s)
- D Krievins
- Arpida Ltd., Duggingerstrasse 23, Reinach, Switzerland
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Askergren A, Brandt R, Gullquist R, Silk B, Strandell T. The effect of fluid deprivation, antidiuretic hormone and forced fluid intake on 51-Cr-EDTA clearance. Acta Med Scand 2009; 210:377-80. [PMID: 6801929 DOI: 10.1111/j.0954-6820.1981.tb09834.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The effect of fluid deprivation, antidiuretic hormone (DDAVP) and forced fluid intake on glomerular filtration rate (GFR) was studied in 41 healthy males by determining 51-Cr-EDTA clearance after a single bolus injection. GFR was the same on forced and on free fluid intake. A small, clinically insignificant decrease in GFR (-6.5%), compared to values on free fluid intake, was registered during the periods of fluid deprivation plus DDAVP. There seem to be no objections to combining a clearance study with a concentrating ability test when screening groups of subjects with normal or near normal GFR.
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