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Ismail A, Schäfer C, Heiss A, Walter M, Jahnen-Dechent W, Leonhardt S. An electrochemical impedance spectroscopy (EIS) assay measuring the calcification inhibition capacity in biological fluids. Biosens Bioelectron 2011; 26:4702-7. [DOI: 10.1016/j.bios.2011.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Revised: 05/02/2011] [Accepted: 05/16/2011] [Indexed: 10/18/2022]
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Schultz S, Bartsch H, Sotlar K, Petat-Dutter K, Bonin M, Poths S, Walter M, Riess O, Wallwiener D, Fehm T, Neubauer H. Differentielle Expression von mRNAs und miRNAs während der Progression des Mammakarzinoms. Geburtshilfe Frauenheilkd 2011. [DOI: 10.1055/s-0031-1286420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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153
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Neubauer H, Hoffmann J, Walter M, Staebler A, Poths S, Riess O, Wallwiener D, Bonin M, Fehm T. Identification of new targets of cisplatin resistance in ovarian cancer patients using combined transcriptome and methylation analyses. Geburtshilfe Frauenheilkd 2011. [DOI: 10.1055/s-0031-1286459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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154
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Tapfer A, Bech M, Pauwels B, Liu X, Bruyndonckx P, Sasov A, Kenntner J, Mohr J, Walter M, Schulz J, Pfeiffer F. SU-C-211-01: First Results from a Preclinical X-Ray Phase-Contrast CT Scanner. Med Phys 2011. [DOI: 10.1118/1.3611491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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155
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Volkmann H, Walter M, Walter C, Vetter S. [Anticoagulation in atrial fibrillation. Strategies in special situations]. Clin Res Cardiol Suppl 2011; 6:58-65. [PMID: 22528179 DOI: 10.1007/s11789-011-0022-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Morbidity and mortality associated with atrial fibrillation are mainly related to thromboembolic complications, particularly ischemic strokes. The prevention of thromboembolism is an important component of the management of patients with atrial fibrillation. The choice of optimum antithrombotic therapy for a given patient depends on the risk of thromboembolism, on the one hand, and the risk of intracerebral hemorrhage, on the other hand. Concerning the benefit-to-risk stratification, the problem lies in the similar and sometimes even identical risk factors for both thromboembolism and hemorrhage.At present, oral vitamin K antagonists are recommended for patients with atrial fibrillation at moderate or high risk of ischemic stroke. The thromboembolic risk should be assessed using validated stratification schemes, such as the CHADS(2) score for basic orientation and the CHA(2)DS(2)VASc score for extended risk stratification. Aspirin alone is recommended for patients at low risk of thromboembolic complications. Problems in antithrombotic therapy of atrial fibrillation arise treating those patients undergoing percutaneous coronary intervention and stent implantation, those with contraindication for vitamin K antagonists, or those with persisting left atrial thrombus requiring electrical cardioversion. The optimum therapeutic management of these special patients has not yet been defined by proper studies, leaving only empirically based recommendations for their treatment.Hopefully the development of new antithrombotic agents, that are easier to use and have a superior benefit-to-risk ratio, will extend effective prevention of thromboembolic events to a greater part of the atrial fibrillation population at risk.
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Sass J, Driess J, Walter M, Grünert S, Sommer A. Confirming Canavan disease using Epstein–Barr Virus (EBV)-transformed lymphocytes. Clin Biochem 2011. [DOI: 10.1016/j.clinbiochem.2011.03.108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abbasi R, Abdou Y, Abu-Zayyad T, Adams J, Aguilar JA, Ahlers M, Andeen K, Auffenberg J, Bai X, Baker M, Barwick SW, Bay R, Bazo Alba JL, Beattie K, Beatty JJ, Bechet S, Becker JK, Becker KH, Benabderrahmane ML, BenZvi S, Berdermann J, Berghaus P, Berley D, Bernardini E, Bertrand D, Besson DZ, Bindig D, Bissok M, Blaufuss E, Blumenthal J, Boersma DJ, Bohm C, Bose D, Böser S, Botner O, Braun J, Brown AM, Buitink S, Carson M, Chirkin D, Christy B, Clem J, Clevermann F, Cohen S, Colnard C, Cowen DF, D'Agostino MV, Danninger M, Daughhetee J, Davis JC, De Clercq C, Demirörs L, Depaepe O, Descamps F, Desiati P, de Vries-Uiterweerd G, DeYoung T, Díaz-Vélez JC, Dierckxsens M, Dreyer J, Dumm JP, Ehrlich R, Eisch J, Ellsworth RW, Engdegård O, Euler S, Evenson PA, Fadiran O, Fazely AR, Fedynitch A, Feusels T, Filimonov K, Finley C, Fischer-Wasels T, Foerster MM, Fox BD, Franckowiak A, Franke R, Gaisser TK, Gallagher J, Geisler M, Gerhardt L, Gladstone L, Glüsenkamp T, Goldschmidt A, Goodman JA, Grant D, Griesel T, Gross A, Grullon S, Gurtner M, Ha C, Hallgren A, Halzen F, Han K, Hanson K, Heinen D, Helbing K, Herquet P, Hickford S, Hill GC, Hoffman KD, Homeier A, Hoshina K, Hubert D, Huelsnitz W, Hülss JP, Hulth PO, Hultqvist K, Hussain S, Ishihara A, Jacobsen J, Japaridze GS, Johansson H, Joseph JM, Kampert KH, Kappes A, Karg T, Karle A, Kelley JL, Kemming N, Kenny P, Kiryluk J, Kislat F, Klein SR, Köhne JH, Kohnen G, Kolanoski H, Köpke L, Kopper S, Koskinen DJ, Kowalski M, Kowarik T, Krasberg M, Krings T, Kroll G, Kuehn K, Kuwabara T, Labare M, Lafebre S, Laihem K, Landsman H, Larson MJ, Lauer R, Lehmann R, Lünemann J, Madsen J, Majumdar P, Marotta A, Maruyama R, Mase K, Matis HS, Meagher K, Merck M, Mészáros P, Meures T, Middell E, Milke N, Miller J, Montaruli T, Morse R, Movit SM, Nahnhauer R, Nam JW, Naumann U, Niessen P, Nygren DR, Odrowski S, Olivas A, Olivo M, O'Murchadha A, Ono M, Panknin S, Paul L, Pérez de los Heros C, Petrovic J, Piegsa A, Pieloth D, Porrata R, Posselt J, Price PB, Prikockis M, Przybylski GT, Rawlins K, Redl P, Resconi E, Rhode W, Ribordy M, Rizzo A, Rodrigues JP, Roth P, Rothmaier F, Rott C, Ruhe T, Rutledge D, Ruzybayev B, Ryckbosch D, Sander HG, Santander M, Sarkar S, Schatto K, Schmidt T, Schoenwald A, Schukraft A, Schultes A, Schulz O, Schunck M, Seckel D, Semburg B, Seo SH, Sestayo Y, Seunarine S, Silvestri A, Slipak A, Spiczak GM, Spiering C, Stamatikos M, Stanev T, Stephens G, Stezelberger T, Stokstad RG, Stoyanov S, Strahler EA, Straszheim T, Sullivan GW, Swillens Q, Taavola H, Taboada I, Tamburro A, Tarasova O, Tepe A, Ter-Antonyan S, Tilav S, Toale PA, Toscano S, Tosi D, Turčan D, van Eijndhoven N, Vandenbroucke J, Van Overloop A, van Santen J, Vehring M, Voge M, Voigt B, Walck C, Waldenmaier T, Wallraff M, Walter M, Weaver C, Wendt C, Westerhoff S, Whitehorn N, Wiebe K, Wiebusch CH, Williams DR, Wischnewski R, Wissing H, Wolf M, Woschnagg K, Xu C, Xu XW, Yodh G, Yoshida S, Zarzhitsky P. Limits on neutrino emission from gamma-ray bursts with the 40 string IceCube detector. PHYSICAL REVIEW LETTERS 2011; 106:141101. [PMID: 21561178 DOI: 10.1103/physrevlett.106.141101] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2011] [Indexed: 05/30/2023]
Abstract
IceCube has become the first neutrino telescope with a sensitivity below the TeV neutrino flux predicted from gamma-ray bursts if gamma-ray bursts are responsible for the observed cosmic-ray flux above 10(18) eV. Two separate analyses using the half-complete IceCube detector, one a dedicated search for neutrinos from pγ interactions in the prompt phase of the gamma-ray burst fireball and the other a generic search for any neutrino emission from these sources over a wide range of energies and emission times, produced no evidence for neutrino emission, excluding prevailing models at 90% confidence.
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Hellmann GP, Walter M, Dietz M, Steurer A. In-situ preparation of graft copolymers. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19961120125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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159
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Walter M, Gerber H, Wiesbeck G, Riecher-Rössler A, Borgwardt S. Stress reactivity in patients with drug dependence and personality disorders. Eur Psychiatry 2011. [DOI: 10.1016/s0924-9338(11)73817-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Drug dependence is defined as a chronic relapsing brain disorder that is defined by a compulsion to seek and use drugs despite negative consequences. Drug-related cues and stress are known to be key factors for drug use. It has been argued that drug use could be seen as self-medication in patients with drug dependence and co-occurring personality disorders. However, the relevance of co-occurring personality disorders for stress reactivity after drug use is not clear.Thirty drug-dependent patients on stable opioid maintenance treatment with and without personality disorders were examined in a randomized placebo-controlled crossover study to investigate the effects of diacetylmorphine (DAM = heroin) on stress reactivity. They were compared with 20 healthy volunteers receiving saline. The drug-dependent patients administered either their individual prescribed DAM dose or saline. Afterwards they completed four emotional tasks while brain responses were measured with functional magnetic resonance imaging (fMRI). Before and after the fMRI investigation, adrenocorticotropic hormone (ACTH), cortisol, DAM blood levels, and psychological stress parameters, such as anxiety, anger, and craving were measured.The findings of DAM effects on stress reactivity in patients with drug dependence and co-occurring personality disorders will be reported and clinical implications regarding specific psychosocial interventions will be discussed.
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Walter M, Kraft O. A new method to measure torsion moments on small-scaled specimens. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:035109. [PMID: 21456791 DOI: 10.1063/1.3557824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
As a result of a continuous evolution in the field of small-scaled components, an increasing need exists for mechanical characterization of single structures and materials in micrometer dimensions. Moreover, for a detailed analysis of the deformation and failure behavior, it is often necessary to perform investigations under multiaxial loading in addition to uniaxial loading. A simple possibility to create defined multiaxial stress-strain fields is offered by a torsion experiment. In the frame of this work, a new method is presented, which allows determining torsion moments applied to wires as thin as 10 μm in monotonic as well as cyclic manner. Besides a detailed description of the measuring principle, the experimental setup and the first results will be presented. In particular, investigations on gold wires with diameters ranging from 10 to 60 μm, applying torsion moments in the nNm regime, are shown.
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Sollberger D, Walter M. Psychotherapie der Borderline-Persönlichkeitsstörung: Gemeinsamkeiten und Differenzen evidenzbasierter störungsspezifischer Behandlungen. FORTSCHRITTE DER NEUROLOGIE-PSYCHIATRIE 2010; 78:698-708. [DOI: 10.1055/s-0029-1245626] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tylki-Szymanska A, Gradowska W, Sommer A, Heer A, Walter M, Reinhard C, Omran H, Sass JO, Jurecka A. Aminoacylase 1 deficiency associated with autistic behavior. J Inherit Metab Dis 2010; 33 Suppl 3:S211-4. [PMID: 20480396 DOI: 10.1007/s10545-010-9089-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 02/25/2010] [Accepted: 03/22/2010] [Indexed: 01/09/2023]
Abstract
Aminoacylase 1 (ACY1) deficiency is a recently described inborn error of metabolism. Most of the patients reported so far have presented with rather heterogeneous neurologic symptoms. At this moment, it is not clear whether ACY1 deficiency represents a true metabolic disease with a causal relationship between the enzyme defect and the clinical phenotype or merely a biochemical abnormality. Here we present a patient identified in the course of selective screening for inborn errors of metabolism (IEM). The patient was diagnosed with autistic syndrome and admitted to the Children's Memorial Health Institute (CMHI) for metabolic evaluation. Organic acid analysis using gas chromatography-mass spectrometry (GC-MS) revealed increased urinary excretion of several N-acetylated amino acids, including the derivatives of methionine, glutamic acid, alanine, glycine, leucine, isoleucine, and valine. In Epstein-Barr virus (EBV)-transformed lymphoblasts, ACY1 activity was deficient. The mutation analysis showed a homozygous c.1057C>T transition, predicting a p.Arg353Cys substitution. Both parents were heterozygous for the mutation and had normal results in the organic acid analysis using GC-MS. This article reports the findings of an ACY1-deficient patient presenting with autistic features.
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Brossi A, Lindlar H, Walter M, Schnider O. Syntheseversuche in der Emetin-Reihe. 1. Mitteilung. 2-Oxo-hydrobenzo[a]chinolizine. Helv Chim Acta 2010. [DOI: 10.1002/hlca.660410117] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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164
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Sass JO, Fischer K, Wang R, Christensen E, Scholl-Bürgi S, Chang R, Kapelari K, Walter M. D-glyceric aciduria is caused by genetic deficiency of D-glycerate kinase (GLYCTK). Hum Mutat 2010; 31:1280-5. [DOI: 10.1002/humu.21375] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Accepted: 09/24/2010] [Indexed: 11/06/2022]
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Metzger CD, Eckert U, Steiner J, Sartorius A, Buchmann JE, Stadler J, Tempelmann C, Speck O, Bogerts B, Abler B, Walter M. High field FMRI reveals thalamocortical integration of segregated cognitive and emotional processing in mediodorsal and intralaminar thalamic nuclei. Front Neuroanat 2010; 4:138. [PMID: 21088699 PMCID: PMC2981419 DOI: 10.3389/fnana.2010.00138] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Accepted: 09/20/2010] [Indexed: 01/11/2023] Open
Abstract
Thalamocortical loops, connecting functionally segregated, higher order cortical regions, and basal ganglia, have been proposed not only for well described motor and sensory regions, but also for limbic and prefrontal areas relevant for affective and cognitive processes. These functions are, however, more specific to humans, rendering most invasive neuroanatomical approaches impossible and interspecies translations difficult. In contrast, non-invasive imaging of functional neuroanatomy using fMRI allows for the development of elaborate task paradigms capable of testing the specific functionalities proposed for these circuits. Until recently, spatial resolution largely limited the anatomical definition of functional clusters at the level of distinct thalamic nuclei. Since their anatomical distinction seems crucial not only for the segregation of cognitive and limbic loops but also for the detection of their functional interaction during cognitive–emotional integration, we applied high resolution fMRI on 7 Tesla. Using an event-related design, we could isolate thalamic effects for preceding attention as well as experience of erotic stimuli. We could demonstrate specific thalamic effects of general emotional arousal in mediodorsal nucleus and effects specific to preceding attention and expectancy in intralaminar centromedian/parafascicular complex. These thalamic effects were paralleled by specific coactivations in the head of caudate nucleus as well as segregated portions of rostral or caudal cingulate cortex and anterior insula supporting distinct thalamo–striato–cortical loops. In addition to predescribed effects of sexual arousal in hypothalamus and ventral striatum, high resolution fMRI could extent this network to paraventricular thalamus encompassing laterodorsal and parataenial nuclei. We could lend evidence to segregated subcortical loops which integrate cognitive and emotional aspects of basic human behavior such as sexual processing.
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Walter M, von Coburg Y, Isensee K, Sander K, Ligneau X, Camelin JC, Schwartz JC, Stark H. Azole derivatives as histamine H3 receptor antagonists, Part I: Thiazol-2-yl ethers. Bioorg Med Chem Lett 2010; 20:5879-82. [DOI: 10.1016/j.bmcl.2010.07.098] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 07/23/2010] [Accepted: 07/25/2010] [Indexed: 11/29/2022]
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167
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Wenzlau JM, Walter M, Gardner TJ, Frisch LM, Yu L, Eisenbarth GS, Ziegler AG, Davidson HW, Hutton JC. Kinetics of the post-onset decline in zinc transporter 8 autoantibodies in type 1 diabetic human subjects. J Clin Endocrinol Metab 2010; 95:4712-9. [PMID: 20610599 PMCID: PMC3050104 DOI: 10.1210/jc.2010-0169] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
CONTEXT Zinc transporter 8 (ZnT8) is a newly discovered islet autoantigen in human type 1A diabetes (T1D). OBJECTIVE The objective was to document changes in ZnT8 autoantibody (ZnT8A) titer and prevalence after onset of disease in relationship to 65 kDa glutamate decarboxylase antibody (GADA) and islet cell antigen antibody (IA2A). DESIGN/PATIENTS Autoantibody radioimmunoprecipitation assays were performed on sera from three groups: 21 individuals monitored every 3 months from diagnosis for 2.5 yr; 61 individuals monitored at six monthly intervals for 5-12 yr; and a cross-sectional study of 424 patients with T1D of 20-57 yr duration. Circulating C-peptide was determined as an index of residual β-cell function. RESULTS ZnT8A titers declined exponentially from clinical onset of T1D with a t(1/2) ranging from 26 to 530 wk, similar to C-peptide (23-300 wk). Life-table analysis of antibody prevalence to 12 yr indicated that ZnT8A measured with either Arg325 or Trp325 probes persisted for a shorter interval than IA2A. Although prevalence of ZnT8A, IA2A, and GADA were comparable at disease onset (70.4 vs. 73.4 vs. 64%), only 6.7% of individuals remained ZnT8A positive after 25 yr compared with 19.5% for IA2A and 25.9% for GADA. Titers of ZnT8A and IA2A in seropositive individuals decreased progressively, whereas GADA remained elevated consistent with periodic reactivation of GADA humoral autoimmunity. CONCLUSIONS ZnT8 humoral autoreactivity declines rapidly in the first years after disease onset and is less persistent than IA2A or GADA in the longer term. ZnT8A determination may be a useful measure of therapeutic efficacy in the context of immune-based clinical interventions.
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Hicks D, Sarkozy A, Muelas N, Huebner A, Hudson G, Barresi R, Miller J, Gowers J, Hughes P, Roberts R, Turnbull D, Krause S, Walter M, Laval S, Straub V, Lochmüller H, Bushby K. P1.24 Mutations in ANO5 represent a common cause of non-dysferlin LGMD2B and Miyoshi myopathy. Neuromuscul Disord 2010. [DOI: 10.1016/j.nmd.2010.07.039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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169
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Sass JO, Gunduz A, Araujo Rodrigues Funayama C, Korkmaz B, Dantas Pinto KG, Tuysuz B, Yanasse Dos Santos L, Taskiran E, de Fátima Turcato M, Lam CW, Reiss J, Walter M, Yalcinkaya C, Camelo Junior JS. Functional deficiencies of sulfite oxidase: Differential diagnoses in neonates presenting with intractable seizures and cystic encephalomalacia. Brain Dev 2010; 32:544-9. [PMID: 19793632 DOI: 10.1016/j.braindev.2009.09.005] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2009] [Revised: 07/28/2009] [Accepted: 09/05/2009] [Indexed: 11/30/2022]
Abstract
Sulfite oxidase is a mitochondrial enzyme encoded by the SUOX gene and essential for the detoxification of sulfite which results mainly from the catabolism of sulfur-containing amino acids. Decreased activity of this enzyme can either be due to mutations in the SUOX gene or secondary to defects in the synthesis of its cofactor, the molybdenum cofactor. Defects in the synthesis of the molybdenum cofactor are caused by mutations in one of the genes MOCS1, MOCS2, MOCS3 and GEPH and result in combined deficiencies of the enzymes sulfite oxidase, xanthine dehydrogenase and aldehyde oxidase. Although present in many ethnic groups, isolated sulfite oxidase deficiency and molybdenum cofactor deficiency are rare inborn errors of metabolism, which makes awareness of key clinical and laboratory features of affected individuals crucial for early diagnosis. We report clinical, radiologic, biochemical and genetic data on a Brazilian and on a Turkish child with sulfite oxidase deficiency due to the isolated defect and impaired synthesis of the molybdenum cofactor, respectively. Both patients presented with early onset seizures and neurological deterioration. They showed no sulfite oxidase activity in fibroblasts and were homozygous for the mutations c.1136A>G in the SUOX gene and c.667insCGA in the MOCS1 gene, respectively. Widely available routine laboratory tests such as assessment of total homocysteine and uric acid are indicated in children with a clinical presentation resembling that of hypoxic ischemic encephalopathy and may help in obtaining a tentative diagnosis locally, which requires confirmation by specialized laboratories.
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Goodwin W, McCabe D, Sauter E, Reese E, Walter M, Buckwalter JA, Martin JA. Rotenone prevents impact-induced chondrocyte death. J Orthop Res 2010; 28:1057-63. [PMID: 20108345 PMCID: PMC3678274 DOI: 10.1002/jor.21091] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mechanical insult to articular cartilage kills chondrocytes, an event that may increase the risk of posttraumatic osteoarthritis. Recent reports indicate that antioxidants decrease impact-induced chondrocyte death, but the source(s) of oxidants, the time course of oxidant release, and the identity of the oxidative species generated in response to injury are unknown. A better understanding of these processes could lead to new treatments of acute joint injuries. To that end, we studied the kinetics and distribution of oxidant production in osteochondral explants subjected to a single, blunt-impact injury. We followed superoxide production by measuring the time-dependent accumulation of chondrocyte nuclei stained with the superoxide-sensitive probe dihydroethidium. The percentage of chondrocytes that were dihydroethidium-positive was 35% above baseline 10 min after impact, and 65% above baseline 60 min after impact. Most positive cells were found within and near areas contacted directly by the impact platen. Rotenone, an electron transport chain inhibitor, was used to test the hypothesis that mitochondria contribute to superoxide release. Rotenone treatment significantly reduced dihydroethidium staining, which remained steady at 15% above baseline for up to 60 min postimpact. Moreover, rotenone reduced chondrocyte death in impact sites by more than 40%, even when administered 2 h after injury (p < 0.001). These data show that much of the acute chondrocyte mortality caused by in vitro impact injuries results from superoxide release from mitochondria, and suggest that brief exposure to free radical scavengers could significantly improve chondrocyte viability following joint injury.
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Papachristou C, Walter M, Klapp BF. Psychological evaluation of living liver donors--a single centre experience. Acta Gastroenterol Belg 2010; 73:383-388. [PMID: 21086944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The psychological evaluation of living liver donors is a substantial part of the preoperative evaluation of donors in many transplantation centres around the globe and aims at securing decision autonomy and informed consent, verifying the psychological stability of the donor and ruling out psychosocial risks. The aims of this paper are to present a short overview of the current state of the psychosocial evaluation of living donors based on the existing literature and to discuss our centre's experience in the psychological evaluation of donors, the lessons we have learned in the past 10 years and an agenda for the future evaluation of donors and research.
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Enkovaara J, Rostgaard C, Mortensen JJ, Chen J, Dułak M, Ferrighi L, Gavnholt J, Glinsvad C, Haikola V, Hansen HA, Kristoffersen HH, Kuisma M, Larsen AH, Lehtovaara L, Ljungberg M, Lopez-Acevedo O, Moses PG, Ojanen J, Olsen T, Petzold V, Romero NA, Stausholm-Møller J, Strange M, Tritsaris GA, Vanin M, Walter M, Hammer B, Häkkinen H, Madsen GKH, Nieminen RM, Nørskov JK, Puska M, Rantala TT, Schiøtz J, Thygesen KS, Jacobsen KW. Electronic structure calculations with GPAW: a real-space implementation of the projector augmented-wave method. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:253202. [PMID: 21393795 DOI: 10.1088/0953-8984/22/25/253202] [Citation(s) in RCA: 675] [Impact Index Per Article: 48.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Electronic structure calculations have become an indispensable tool in many areas of materials science and quantum chemistry. Even though the Kohn-Sham formulation of the density-functional theory (DFT) simplifies the many-body problem significantly, one is still confronted with several numerical challenges. In this article we present the projector augmented-wave (PAW) method as implemented in the GPAW program package (https://wiki.fysik.dtu.dk/gpaw) using a uniform real-space grid representation of the electronic wavefunctions. Compared to more traditional plane wave or localized basis set approaches, real-space grids offer several advantages, most notably good computational scalability and systematic convergence properties. However, as a unique feature GPAW also facilitates a localized atomic-orbital basis set in addition to the grid. The efficient atomic basis set is complementary to the more accurate grid, and the possibility to seamlessly switch between the two representations provides great flexibility. While DFT allows one to study ground state properties, time-dependent density-functional theory (TDDFT) provides access to the excited states. We have implemented the two common formulations of TDDFT, namely the linear-response and the time propagation schemes. Electron transport calculations under finite-bias conditions can be performed with GPAW using non-equilibrium Green functions and the localized basis set. In addition to the basic features of the real-space PAW method, we also describe the implementation of selected exchange-correlation functionals, parallelization schemes, ΔSCF-method, x-ray absorption spectra, and maximally localized Wannier orbitals.
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Junker K, Walter M, Kroeger N, Steiner T, von Eggeling F, Wunderlich H. TKI therapy-related proteomic patterns in serum from patients with metastatic renal cell carcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e15090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Keymeulen B, Walter M, Mathieu C, Kaufman L, Gorus F, Hilbrands R, Vandemeulebroucke E, Van de Velde U, Crenier L, De Block C, Candon S, Waldmann H, Ziegler AG, Chatenoud L, Pipeleers D. Four-year metabolic outcome of a randomised controlled CD3-antibody trial in recent-onset type 1 diabetic patients depends on their age and baseline residual beta cell mass. Diabetologia 2010; 53:614-23. [PMID: 20225393 DOI: 10.1007/s00125-009-1644-9] [Citation(s) in RCA: 251] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
AIMS/HYPOTHESIS The aim of the study was to examine the 48 month outcome of treating recent-onset type 1 diabetic patients for 6 days with humanised CD3-antibody, ChAglyCD3. METHODS Eighty patients, aged 12-39 years, were recruited for a phase 2 multicentre trial and randomised to placebo (n=40) or ChAglyCD3 (n=40) treatment by a third party member; participants and care-givers were blinded. The change in insulin dose (U kg(-1)day(-1)) over 48 months was chosen as primary endpoint and compared in 31 placebo-and 33 ChAglyCD3-treated patients. Adverse events were followed in 35 and 38 patients, respectively. RESULTS Treatment with ChAglyCD3 delayed the rise in insulin requirements of patients with recent-onset diabetes and reduced its amplitude over 48 months (+0.09 vs +0.32 U kg(-1)day(-1) in the placebo group). Using multivariate analysis this effect was correlated with higher baseline residual beta cell function and a younger age. It was associated with better outcome variables in subgroups selected according to these variables. In the ChAglyCD3 subgroup with higher initial beta cell function, 0/11 patients became C-peptide-negative over 48 months vs 4/9 in the corresponding placebo subgroup. In the subgroup aged <27 years old, antibody treatment preserved initial beta cell function for 36 months (vs >80% decline within 24 months in the placebo subgroup <27 years old), resulted in lower HbA1c concentrations and tended to reduce glycaemic variability (p=0.08). No longterm adverse events were observed. CONCLUSIONS/INTERPRETATION A 6 day ChAglyCD3 treatment can suppress the rise in insulin requirements of recent-onset type 1 diabetic patients over 48 months, depending on their age and initial residual beta cell function. In younger patients this effect is associated with reduced deterioration of metabolic variables. These observations help to define inclusion criteria for prevention trials. TRIAL REGISTRATION ClinicalTrials.gov NCT00627146 FUNDING Center grants from the Juvenile Diabetes Research Foundation (4-2001-434, 4-2005-1327) and grants from the Belgian Fund for Scientific Research-Flanders and from Brussels Free University-VUB.
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Försch J, Monti P, Bonifacio E, Walter M, Achenbach P, Ziegler AG. Immunmodulierende Wirkung einer adjuvanten Behandlung mit 1α,25(OH)2Vitamin D3 auf dendritische Zellen bei Patienten mit neu manifestiertem Typ 1-Diabetes. DIABETOL STOFFWECHS 2010. [DOI: 10.1055/s-0030-1253789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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