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Dumas L, Marfoglia M, Yang B, Hijazi M, Larabi AN, Lau K, Pojer F, Nash MA, Barth P. Uncovering and engineering the mechanical properties of the adhesion GPCR ADGRG1 GAIN domain. bioRxiv 2023:2023.04.05.535724. [PMID: 37066252 PMCID: PMC10104041 DOI: 10.1101/2023.04.05.535724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
Key cellular functions depend on the transduction of extracellular mechanical signals by specialized membrane receptors including adhesion G-protein coupled receptors (aGPCRs). While recently solved structures support aGPCR activation through shedding of the extracellular GAIN domain, the molecular mechanisms underpinning receptor mechanosensing remain poorly understood. When probed using single-molecule atomic force spectroscopy and molecular simulations, ADGRG1 GAIN dissociated from its tethered agonist at forces significantly higher than other reported signaling mechanoreceptors. Strong mechanical resistance was achieved through specific structural deformations and force propagation pathways under mechanical load. ADGRG1 GAIN variants computationally designed to lock the alpha and beta subdomains and rewire mechanically-induced structural deformations were found to modulate the GPS-Stachel rupture forces. Our study provides unprecedented insights into the molecular underpinnings of GAIN mechanical stability and paves the way for engineering mechanosensors, better understanding aGPCR function, and informing drug-discovery efforts targeting this important receptor class.
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von Stillfried S, Freeborn B, Windeck S, Boor P, Böcker J, Schmidt J, Tholen P, Röhrig R, Majeed R, Wienströer J, Bremer J, Weis J, Knüchel R, Breitbach A, Bülow RD, Cacchi C, Wucherpfennig S, Märkl B, Claus R, Dhillon C, Schaller T, Sipos E, Spring O, Braun G, Römmele C, Kling E, Kröncke T, Wittmann M, Hirschbühl K, Heppner FL, Meinhardt J, Radbruch H, Streit S, Horst D, Elezkurtaj S, Quaas A, Göbel H, Friemann J, Hansen T, Titze U, Lorenzen J, Reuter T, Woloszyn J, Baretton G, Hilsenbeck J, Meinhardt M, Pablik J, Sommer L, Holotiuk O, Meinel M, Esposito I, Crudele G, Seidl M, Mahlke N, Hartmann A, Haller F, Eichhorn P, Lange F, Amann KU, Coras R, Ingenwerth M, Rawitzer J, Schmid KW, Theegarten D, Gradhand E, Smith K, Wild P, Birngruber CG, Schilling O, Werner M, Acker T, Gattenlöhner S, Franz J, Metz I, Stadelmann C, Stork L, Thomas C, Zechel S, Ströbel P, Fathke C, Harder A, Wickenhauser C, Glatzel M, Matschke J, Krasemann S, Dietz E, Edler C, Fitzek A, Fröb D, Heinemann A, Heinrich F, Klein A, Kniep I, Lohner L, Möbius D, Ondruschka B, Püschel K, Schädler J, Schröder AS, Sperhake JP, Aepfelbacher M, Fischer N, Lütgehetmann M, Pfefferle S, Jonigk D, Werlein C, Domke LM, Hartmann L, Klein I, Schirmacher P, Schwab C, Röcken C, Langer D, Roth W, Strobl S, Rudelius M, Delbridge C, Kasajima A, Kuhn PH, Slotta-Huspenina J, Weichert W, Weirich G, Stock K, Barth P, Schnepper A, Wardelmann E, Evert K, Evert M, Büttner A, Manhart J, Nigbur S, Bösmüller H, Fend F, Granai M, Klingel K, Warm V, Steinestel K, Umathum VG, Rosenwald A, Vogt N, Kurz F. [Update on collaborative autopsy-based research in German pathology, neuropathology, and forensic medicine]. Pathologie (Heidelb) 2022; 43:101-105. [PMID: 36114379 PMCID: PMC9483541 DOI: 10.1007/s00292-022-01117-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Accepted: 08/30/2022] [Indexed: 01/02/2023]
Abstract
BACKGROUND Autopsies are a valuable tool for understanding disease, including COVID-19. MATERIALS AND METHODS The German Registry of COVID-19 Autopsies (DeRegCOVID), established in April 2020, serves as the electronic backbone of the National Autopsy Network (NATON), launched in early 2022 following DEFEAT PANDEMIcs. RESULTS The NATON consortium's interconnected, collaborative autopsy research is enabled by an unprecedented collaboration of 138 individuals at more than 35 German university and non-university autopsy centers through which pathology, neuropathology, and forensic medicine autopsy data including data on biomaterials are collected in DeRegCOVID and tissue-based research and methods development are conducted. More than 145 publications have now emerged from participating autopsy centers, highlighting various basic science and clinical aspects of COVID-19, such as thromboembolic events, organ tropism, SARS-CoV‑2 detection methods, and infectivity of SARS-CoV-2 at autopsy. CONCLUSIONS Participating centers have demonstrated the high value of autopsy and autopsy-derived data and biomaterials to modern medicine. The planned long-term continuation and further development of the registry and network, as well as the open and participatory design, will allow the involvement of all interested partners.
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Affiliation(s)
- Saskia von Stillfried
- Institut für Pathologie, Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland
| | - Benita Freeborn
- Institut für Pathologie, Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland
| | - Svenja Windeck
- Institut für Pathologie, Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland
| | - Peter Boor
- Institut für Pathologie, Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland ,Medizinische Klinik II (Nephrologie und Immunologie), Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland ,Elektronenmikroskopische Einrichtung, Universitätsklinik RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Deutschland
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Barth P, Bruijnzeel P, Wach A, Sellier Kessler O, Hooftman L, Zimmermann J, Naue N, Huber B, Heimbeck I, Kappeler D, Timmer W, Chevalier E. Single dose escalation studies with inhaled POL6014, a potent novel selective reversible inhibitor of human neutrophil elastase, in healthy volunteers and subjects with cystic fibrosis. J Cyst Fibros 2020; 19:299-304. [DOI: 10.1016/j.jcf.2019.08.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 08/20/2019] [Accepted: 08/20/2019] [Indexed: 12/01/2022]
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Abstract
The prominence of G protein-coupled receptors (GPCRs) in human physiology and disease has resulted in their intense study in various fields of research ranging from neuroscience to structural biology. With over 800 members in the human genome and their involvement in a myriad of diseases, GPCRs are the single largest family of drug targets, and an ever-present interest exists in further drug discovery and structural characterization efforts. However, low GPCR expression and stability outside the natural lipid environments have challenged these efforts. In vivo functional studies of GPCR signaling are complicated not only by the need for specific spatiotemporal activation, but also by downstream effector promiscuity. In this review, we summarize the present and emerging GPCR engineering methods that have been employed to overcome the challenges involved in receptor characterization, and to better understand the functional role of these receptors.
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Affiliation(s)
- D Keri
- Swiss Federal Institute of Technology (EPFL), Interfaculty Institute of Bioengineering, 1015 Lausanne, Switzerland
| | - P Barth
- Swiss Federal Institute of Technology (EPFL), Interfaculty Institute of Bioengineering, 1015 Lausanne, Switzerland; Ludwig Institute for Cancer Research Lausanne Branch, 1066 Lausanne, Switzerland; Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA; Department of Pharmacology and Chemical Biology, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
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Abstract
SummaryBy use of purified contact activation product (CAP) it was possible to show that activation of the contact phase of the coagulation system can lead to a state of hypo-coagulability very similar to that occurring in the experimental Sanarelli-Shwartz-man phenomenon (SSP). The coagulation changes which occurred suggested that the difference between the effects of CAP administration and the typical experimental SSP appeared to be merely quantitative in nature. However, the fact that in our experiments on the classical SSP no stasis thrombi developed as the most significant sign of increased coagulation activity, may suggest that pathogenetically important differences exist.
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Abstract
SummaryIn these investigations it was shown that the contact factors of the coagulation system - isolated as in the contact activation test according to Egli or as Celite eluate (Waaler) - do not influence platelet aggregation. Platelet aggregation was measured by the rotation method of Wright.It was concluded that contact of blood with wettable surfaces leads to activation of the coagulation system and independently to aggregation of platelets. By heating of plasma to 56° a platelet aggregating principle is liberated; the significance of this finding needs further investigation.
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Schimpf KL, Barth P, Bartman J, Freienberg J, Hansen B, Meier J. The Coagulation System during the Passage of Blood through the Body. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1651358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
SummaryIn rabbits blood was taken simultaneously from the right heart, aorta, vena cava caudalis, and vena portae. The samples were examined for activities of factors II, VIII, X, contact activation product, antithrombin III, anti-plasma-thromboplastin, for thrombin time, fibrin polymerization time, R+K values in the TEG and platelet count. The parameters were found to change significantly during circulation. The greatest differences were found between right heart on the one hand, and renal vein and portal vein on the other. In 8 of 10 cases the arithmitical means of the tested parameters showed highest or lowest values respectively in the renal vein.
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Barth P, Kommerell B, Beckmann U. Isolierung des Kontaktaktivierungsproduktes des Gerinnungssystems aus Schweineplasma. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1653563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
ZusammenfassungEs wird iiber die Isolierung des Kontaktaktivierungsproduktes des Gerinnungssystems berichtet. Die Reinigungsschritte bestanden in Celite-Adsorption, DEAECellulose- Adsorption, DEAE-Sephadex-Adsorption und Elution. Das so gereinigte Material, das außer Kontaktaktivierungsprodukt-Aktivität keine weiteren Gerinnungseigenschaften aufwies - außer einer leichten Faktor-IX-Aktivität, die durch BaSO 4-Adsorption des Ausgangsplasmas vermieden werden konnte - , war einheitlich bei der Gelchromatographie an Sephadex G 200, in der Immunpräzipitation und in der Immunelektrophorese. Die Diskelektrophorese zeigte noch eine sehr schwache zweiteBande.
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Hasse C, Klöck G, Zielke A, Schlosser A, Barth P, Zimmermann U, Rothmund M. Transplantation of parathyroid tissue in experimental hypoparathyroidism: in vitro and in vivo function of parathyroid tissue microencapsulated with a novel amitogenic alginate. Int J Artif Organs 2018. [DOI: 10.1177/039139889601901210] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [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
Microencapsulation of tissues is an alternative to postoperative immunosuppression in transplantation. In 1994 iso-, allo- and xenotransplantation of microencapsulated parathyroid tissue was achieved in vivo. However, continued analysis of the coating substance (an alginate) determined mitogenic properties. Here, we report on the in vitro and in vivo function of parathyroid tissue microencapsulated with a novel amitogenic alginate suitable for use in humans. To assess in vitro function, parathyroid tissue encapsulated with mitogenic and amitogenic alginate was exposed to rising concentrations of calcium. For in vivo experiments, it was isotransplanted into parathyroidectomized rats. PTH release into medium and PTH serum levels as well as calcium levels of recipient rats were analyzed and compared to native (non-microencapsulated) tissue and empty capsules, respectively. In vivo, transplants were excised and subjected to histologic examination six months after trans-plantation. In vitro, parathyroid tissue encapsulated with amitogenic alginate releases approximately half of the PTH of native tissue, not different from tissue encapsulated with the mitogenic alginate. In vivo, the novel alginate preserved parathyroid function similar to that of native tissue over the six month period resulting in complete reversal of hypoparathyroidism. Correspondingly, histologic examination revealed vital parathyroid tissue in intact microcapsules. By establishing in vitro function and successful long-term transplantation, we have documented the principle of microencapsulation of parathyroid tissue to be effective also with the novel amitogenic alginate, which is suitable for clinical use.
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Affiliation(s)
- C. Hasse
- Department of Surgery, Philipps-University of Marburg, Marburg
| | - G. Klöck
- Institute of Biotechnology, Julius-Maximilians University of Würzburg, Würzburg
| | - A. Zielke
- Department of Surgery, Philipps-University of Marburg, Marburg
| | - A. Schlosser
- Department of Surgery, Philipps-University of Marburg, Marburg
| | - P. Barth
- Institute of Pathology, Philipps-University of Marburg, Marburg - Germany
| | - U. Zimmermann
- Institute of Biotechnology, Julius-Maximilians University of Würzburg, Würzburg
| | - M. Rothmund
- Department of Surgery, Philipps-University of Marburg, Marburg
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Glezou S, Herberg U, Körperich H, Barth P, Burchert W, Kececioglu D, Dalla R, Laser K. Pediatric Left Ventricular Volumetry Using Real-time Three-dimensional Echocardiography: Validation and Multicenter Reference Values Based on High Sample Size. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0038-1628332] [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: 10/28/2022]
Affiliation(s)
- S. Glezou
- Department of Congenital Heart Defects, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
| | - U. Herberg
- Department of Pediatric Cardiology, Children’s Hospital, University of Bonn, Bonn, Germany
| | - H. Körperich
- Institute of Radiology, Nuclear Medicine and Molecular Imaging, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
| | - P. Barth
- Institute of Radiology, Nuclear Medicine and Molecular Imaging, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
| | - W. Burchert
- Institute of Radiology, Nuclear Medicine and Molecular Imaging, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
| | - D. Kececioglu
- Department of Congenital Heart Defects, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
| | - R. Dalla
- Department of Pediatric Cardiology and Pediatric Intensive Care, Ludwig Maximilians University, Medical Hospital of the University of Munich, Munich, Germany
| | - K.T. Laser
- Department of Congenital Heart Defects, Heart and Diabetes Centre North Rhine Westphalia, Ruhr University Bochum, Bad Oeynhausen, Germany
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Klusmeier E, Körperich H, Knyphausen E, Racolta A, Barth P, Kececioglu D, Burchert W, Laser K. Extracellular Volume by T1 Mapping Is Elevated after Pediatric Heart Transplantation. Thorac Cardiovasc Surg 2018. [DOI: 10.1055/s-0037-1615790] [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: 10/28/2022]
Affiliation(s)
- E. Klusmeier
- Zentrum für angeborene Herzfehler, HDZ-NRW, Bad Oeynhausen, Germany
| | - H. Körperich
- Nuklearmedizin und Molekulare Bildgebung, Institut für Radiologie, HDZ-NRW, Bad Oeynhausen, Germany
| | - E. Knyphausen
- Zentrum für angeborene Herzfehler, HDZ-NRW, Bad Oeynhausen, Germany
| | - A. Racolta
- Zentrum für angeborene Herzfehler, HDZ-NRW, Bad Oeynhausen, Germany
| | - P. Barth
- Nuklearmedizin und Molekulare Bildgebung, Institut für Radiologie, HDZ-NRW, Bad Oeynhausen, Germany
| | - D. Kececioglu
- Zentrum für angeborene Herzfehler, HDZ-NRW, Bad Oeynhausen, Germany
| | - W. Burchert
- Nuklearmedizin und Molekulare Bildgebung, Institut für Radiologie, HDZ-NRW, Bad Oeynhausen, Germany
| | - K.T. Laser
- Zentrum für angeborene Herzfehler, HDZ-NRW, Bad Oeynhausen, Germany
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Hooftman L, Chevalier E, Wach A, Zimmermann J, Bruijnzeel P, Naue N, Heimbeck I, Kappeler D, Barth P. WS01.4 A randomised, double-blind, placebo-controlled, parallel-group, dose-escalation study of inhaled single doses of POL6014, a potent and selective reversible inhibitor of human neutrophil elastase (NE), in cystic fibrosis (CF) patients. J Cyst Fibros 2017. [DOI: 10.1016/s1569-1993(17)30159-5] [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: 12/01/2022]
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Laser K, Müller K, Barth P, Klusmeier E, Gieseke J, Haas N, Kececioglu D, Burchert W, Körperich H. Classification of Fontan Hemodynamics by Respiration Using Real-Time Phase-Contrast Magnetic Resonance. Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571854] [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: 10/22/2022]
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Lenschow C, Lindner K, Müller AK, Barth P, Senninger N, Colombo-Benkmann M. [Not Available]. Chirurg 2015. [PMID: 26223667 DOI: 10.1007/s00104-015-0061-5] [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)
- C Lenschow
- Klinik für Allgemein-und Viszeralchirurgie, Universitätsklinikum Münster, Waldeyerstrasse 1, 48149, Münster, Deutschland.
| | - K Lindner
- Klinik für Allgemein-und Viszeralchirurgie, Universitätsklinikum Münster, Waldeyerstrasse 1, 48149, Münster, Deutschland
| | - A K Müller
- Klinik für Allgemein-und Viszeralchirurgie, Universitätsklinikum Münster, Waldeyerstrasse 1, 48149, Münster, Deutschland
| | - P Barth
- Gerhard-Domagk Institut für Pathologie, Universitätsklinikum Münster, Münster, Deutschland
| | - N Senninger
- Klinik für Allgemein-und Viszeralchirurgie, Universitätsklinikum Münster, Waldeyerstrasse 1, 48149, Münster, Deutschland
| | - M Colombo-Benkmann
- Klinik für Allgemein-und Viszeralchirurgie, Universitätsklinikum Münster, Waldeyerstrasse 1, 48149, Münster, Deutschland
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Wang Y, Barth P. Evolutionary-guided de novo structure prediction of self-associated transmembrane helical proteins with near-atomic accuracy. Nat Commun 2015; 6:7196. [PMID: 25995083 DOI: 10.1038/ncomms8196] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 04/15/2015] [Indexed: 11/09/2022] Open
Abstract
How specific protein associations regulate the function of membrane receptors remains poorly understood. Conformational flexibility currently hinders the structure determination of several classes of membrane receptors and associated oligomers. Here we develop EFDOCK-TM, a general method to predict self-associated transmembrane protein helical (TMH) structures from sequence guided by co-evolutionary information. We show that accurate intermolecular contacts can be identified using a combination of protein sequence covariation and TMH binding surfaces predicted from sequence. When applied to diverse TMH oligomers, including receptors characterized in multiple conformational and functional states, the method reaches unprecedented near-atomic accuracy for most targets. Blind predictions of structurally uncharacterized receptor tyrosine kinase TMH oligomers provide a plausible hypothesis on the molecular mechanisms of disease-associated point mutations and binding surfaces for the rational design of selective inhibitors. The method sets the stage for uncovering novel determinants of molecular recognition and signalling in single-spanning eukaryotic membrane receptors.
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Affiliation(s)
- Y Wang
- Structural and Computational Biology and Molecular Biophysics Graduate Program, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA
| | - P Barth
- 1] Structural and Computational Biology and Molecular Biophysics Graduate Program, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [2] Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA [3] Department of Pharmacology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030, USA
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Sporns P, Barth P, Wolters H, Schmedt A, Koehler M. Ileumvarizen als seltene Ursache einer unteren gastrointestinalen Blutung. ROFO-FORTSCHR RONTG 2015; 187:487-9. [DOI: 10.1055/s-0034-1385820] [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: 10/23/2022]
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Körperich H, Barth P, Gieseke J, Burchert W, Laser KT. Erfassung atmungsabhängiger Schlagvolumina mittels quantitativer MRT-Echtzeit-Flussmessungen. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1352571] [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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Krückemeier K, Barth P, Peitz U, Hoffmann MW, Allemeyer EH. [Surgical management of a retrorectal tumor with consideration of a rare differential diagnosis]. Chirurg 2012; 83:657-60. [PMID: 22653139 DOI: 10.1007/s00104-012-2312-z] [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: 11/28/2022]
Abstract
We present a case of a retrorectal space occupying lesion diagnosed as an adenocarcinoma of unknown primary origin by preoperative histopathology. Localization slightly above the anal sphincter would have required extirpation of the rectum. Rectal palpation, endosonography and radiological imaging, however, suggested a retrorectal tumor or a metastasis of an adenocarcinoma. Both entities would have required local resection. We applied a surgical algorithm including frozen biopsy allowing a stepwise choice of operative procedure from the spectrum in question. The operation performed was thus tailored to the entity of the tumor.
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Affiliation(s)
- K Krückemeier
- Klinik für Allgemein- und Viszeralchirurgie mit Sektion Proktologie, Raphaelsklinik Münster, Loerstr. 23, 48143, Münster, Deutschland
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Sesterhenn A, Szalay A, Zimmermann A, Werner J, Barth P, Wiegand S. Stellenwert der Autopsie bei Patienten mit Kopf-Halstumoren. Laryngorhinootologie 2012; 91:375-80. [DOI: 10.1055/s-0032-1306363] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- A. Sesterhenn
- Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- & Halschirurgie, Städtisches Klinikum Solingen gGmbH
| | - A. Szalay
- Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, UKGM, Standort Marburg
| | - A. Zimmermann
- Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, UKGM, Standort Marburg
| | - J. Werner
- Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, UKGM, Standort Marburg
| | - P. Barth
- Institut für Pathologie, UKGM, Standort Marburg
| | - S. Wiegand
- Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, UKGM, Standort Marburg
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Bruellmann DD, Tjaden H, Schwanecke U, Barth P. An optimized video system for augmented reality in endodontics: a feasibility study. Clin Oral Investig 2012; 17:441-8. [DOI: 10.1007/s00784-012-0718-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Accepted: 03/06/2012] [Indexed: 11/28/2022]
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Körperich H, Barth P, Gieseke J, Esdorn H, Peterschröder A, Uges G, Kececioglu D, Burchert W, Laser KT. Respiratory dependent stroke volume changes assessed by real time MR velocity mapping at 3 Tesla – A validation study. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0031-1300912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Ripka S, Neesse A, Riedel J, Bug E, Aigner A, Poulsom R, Fulda S, Neoptolemos J, Greenhalf W, Barth P, Gress TM, Michl P. CUX1: target of Akt signalling and mediator of resistance to apoptosis in pancreatic cancer. Gut 2010; 59:1101-10. [PMID: 20442202 DOI: 10.1136/gut.2009.189720] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [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: 01/06/2023]
Abstract
BACKGROUND AND AIMS The transcription factor CUX1 is known as a regulator of cell differentiation and cell cycle progression. Previously, CUX1 was identified as a modulator of invasiveness in various cancers. Based on expression profiles suggesting a role for CUX1 in mediating chemoresistance, the aim of this study was to characterise the effect of CUX1 on apoptosis as well as its regulation by signalling pathways modulating drug resistance in pancreatic cancer. METHODS The effect of CUX1 on TRAIL- (tumour necrosis factor-related apoptosis-inducing ligand) and drug-induced apoptosis was analysed using overexpression and knock-down strategies. Regulation of CUX1 by phosphatidylinositol-3-kinase (PI3K)/Akt signalling was examined at the mRNA and protein level. The effect of CUX1 knock-down by nanoparticle-complexed small interfering RNA (siRNA) in vivo was analysed in a murine xenograft model. Furthermore, CUX1 RNA and protein expression was evaluated in human pancreatic cancer and adjacent normal tissues. RESULTS Knock-down of CUX1 resulted in significantly enhanced TRAIL- and drug-induced apoptosis, associated with increased PARP (poly ADP-ribose polymerase) cleavage and caspase activity. Vice versa, overexpression of CUX1 inhibited apoptosis. CUX1 expression was induced by activation of Akt/protein kinase B signalling, and decreased by PI3K inhibitors. The antiapoptotic effect of CUX1 was associated with upregulation of BCL2 and downregulation of tumour necrosis factor alpha. CUX1 was significantly overexpressed in pancreatic cancers, as analysed by in situ hybridisation and immunohistochemistry. In vivo, silencing of CUX1 by intratumourally administered polyethylenimine-complexed siRNA led to reduced tumour growth and increased apoptosis in pancreatic cancer xenografts. CONCLUSION CUX1 was identified as an important mediator of tumour cell survival in pancreatic cancer in vitro and in vivo.
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Affiliation(s)
- S Ripka
- Department of Gastroenterology and Endocrinology, University Hospital, Philipps-University, Marburg, Germany
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Görg C, Bert T, Klassen E, Neesse A, Barth P, Neubauer A. Kontrastunterstützte sonografische Befunde bei hepatischer Candidiasis. Z Gastroenterol 2010; 48:678-82. [DOI: 10.1055/s-0028-1109954] [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] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Hasenöhrl G, Schmidberger K, Barth P. Erfahrungen mit der total laparoskopischen Hysterektomie im Vergleich zur vaginalen und abdominalen Hysterektomie. Geburtshilfe Frauenheilkd 2010. [DOI: 10.1055/s-0030-1254992] [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: 10/19/2022] Open
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Laser KT, Bunge M, Hauffe P, Argueta JRP, Kelter-Klopping A, Barth P, Sarikouch S, Burchert W, Kececioglu D, Korperich H. Left ventricular volumetry in healthy children and adolescents: comparison of two different real-time three-dimensional matrix transducers with cardiovascular magnetic resonance. European Journal of Echocardiography 2009; 11:138-48. [DOI: 10.1093/ejechocard/jep185] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Huynh MQ, Barth P, Sohlbach K, Neubauer A, Görg C. B-mode ultrasound and contrast-enhanced ultrasound pattern of focal extramedullary hematopoiesis of the spleen in a patient with myeloproliferative disease. Ultraschall Med 2009; 30:297-299. [PMID: 19253208 DOI: 10.1055/s-2008-1027855] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
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Arnold R, Müller H, Schade-Brittinger C, Rinke A, Klose K, Barth P, Wied M, Mayer C, Aminossadati B. Placebo-controlled, double-blind, prospective, randomized study of the effect of octreotide LAR in the control of tumor growth in patients with metastatic neuroendocrine midgut tumors: A report from the PROMID study group. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.4508] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
4508 Background: Octreotide is currently used for the control of symptoms in patients with gastroenteropancreatic neuroendocrine tumors (NETs). However, the ability of long-acting somatostatin analogues to control the growth of well-differentiated metastatic NETs is a matter of debate. The analysis of the first randomized, double-blind, placebo-controlled, multicenter, phase IIIb study of octreotide LAR in patients with metastatic NETs of the midgut is presented. Methods: Treatment-naïve patients with histologically confirmed locally inoperable or metastasized well-differentiated NETs and a Karnofsky index >60 were randomized to receive either octreotide LAR 30 mg/month (mo) or placebo for 18 mos, or until tumor progression or death. The primary endpoint was median time to tumor progression. Secondary endpoints included objective tumor response rate (WHO criteria), measured every 3 mos, as well as symptom control and overall survival. This was a planned interim analysis using the Lan-DeMets error spending approach. Results: Eighty-five patients (n=43 octreotide LAR; n=42 placebo) have been enrolled to date and data from 67 patients with tumor progressions and 16 deaths (n=7 octreotide LAR; n=9 placebo) are included here. Median time to tumor progression in the octreotide LAR and placebo groups were 14.3 mos and 6 mos, respectively (HR: 0.34; 95% CI: 0.20–0.59; P=0.000072). After 6 mos of treatment, stable disease was seen in 67% and 37.2% of patients treated with octreotide LAR and placebo, respectively. Due to the low number of observed deaths, median survival time could not be estimated. Conclusions: Octreotide LAR significantly lengthens median time to tumor progression compared with placebo in patients with metastatic NETs of the midgut. Patients treated with octreotide LAR had a 66% risk reduction of tumor progression compared with patients receiving placebo. Octreotide LAR demonstrates substantial tumor control and shows a more favorable antiproliferative response than placebo as two-thirds of patients treated with octreotide LAR achieved stable disease at 6 mos. [Table: see text]
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Affiliation(s)
- R. Arnold
- Philipps University, Marburg, Germany
| | - H. Müller
- Philipps University, Marburg, Germany
| | | | - A. Rinke
- Philipps University, Marburg, Germany
| | - K. Klose
- Philipps University, Marburg, Germany
| | - P. Barth
- Philipps University, Marburg, Germany
| | - M. Wied
- Philipps University, Marburg, Germany
| | - C. Mayer
- Philipps University, Marburg, Germany
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Neesse A, Michl P, Barth P, Vieth M, Langer P, Ellenrieder V, Gress T. Multifocal Early Gastric Cancer in a Patient with Autoimmune Atrophic Gastritis and Iron Deficiency Anaemia. Z Gastroenterol 2009; 47:223-7. [DOI: 10.1055/s-2008-1027558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Gerharz E, Köhler H, Barth P, Weingärtner K, Bittinger A, Riedmiller H. Morphometrische Untersuchungen zur Vaskularisierung von Nierenzellkarzinomen. Aktuelle Urol 2008. [DOI: 10.1055/s-2008-1055615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
The prediction and design at the atomic level of membrane protein structures and interactions is a critical but unsolved challenge. To address this problem, we have developed an all-atom physical model that describes intraprotein and protein-solvent interactions in the membrane environment. We evaluated the ability of the model to recapitulate the energetics and structural specificities of polytopic membrane proteins by using a battery of in silico prediction and design tests. First, in side-chain packing and design tests, the model successfully predicts the side-chain conformations at 73% of nonexposed positions and the native amino acid identities at 34% of positions in naturally occurring membrane proteins. Second, the model predicts significant energy gaps between native and nonnative structures of transmembrane helical interfaces and polytopic membrane proteins. Third, distortions in transmembrane helices are successfully recapitulated in docking experiments by using fragments of ideal helices judiciously defined around helical kinks. Finally, de novo structure prediction reaches near-atomic accuracy (<2.5 A) for several small membrane protein domains (<150 residues). The success of the model highlights the critical role of van der Waals and hydrogen-bonding interactions in the stability and structural specificity of membrane protein structures and sets the stage for the high-resolution prediction and design of complex membrane protein architectures.
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Affiliation(s)
- P. Barth
- Department of Biochemistry and Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195
| | - J. Schonbrun
- Department of Biochemistry and Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195
| | - D. Baker
- Department of Biochemistry and Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195
- To whom correspondence should be addressed. E-mail:
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Abstract
Predicting how aqueous solvent modulates the conformational transitions and influences the pKa values that regulate the biological functions of biomolecules remains an unsolved challenge. To address this problem, we developed FDPB_MF, a rotamer repacking method that exhaustively samples side chain conformational space and rigorously calculates multibody protein-solvent interactions. FDPB_MF predicts the effects on pKa values of various solvent exposures, large ionic strength variations, strong energetic couplings, structural reorganizations and sequence mutations. The method achieves high accuracy, with root mean square deviations within 0.3 pH unit of the experimental values measured for turkey ovomucoid third domain, hen lysozyme, Bacillus circulans xylanase, and human and Escherichia coli thioredoxins. FDPB_MF provides a faithful, quantitative assessment of electrostatic interactions in biological macromolecules.
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Affiliation(s)
- P Barth
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3206, USA.
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Hegele A, Barth P, Hofmann R, Olbert P. Antineoplastische Wirkung transurethral applizierter CpG-Oligodeoxynucleotide (CpG-ODN) im murinen orthotopen Blasentumormodell. Aktuelle Urol 2006. [DOI: 10.1055/s-2006-947403] [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: 10/19/2022]
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Görg C, Görg K, Bert T, Barth P. Colour Doppler ultrasound patterns and clinical follow-up of incidentally found hypoechoic, vascular tumours of the spleen: evidence for a benign tumour. Br J Radiol 2006; 79:319-25. [PMID: 16585725 DOI: 10.1259/bjr/81529894] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Between January 1990 and January 2005, incidental hypoechoic, vascular tumours of the spleen were identified in 13 patients using B-mode and colour Doppler ultrasound (CDS). All lesions found were well demarcated, intrasplenically located, and ranged in size between 1 cm and 4 cm. The increased vascular pattern on CDS was confirmed in 9 of the 13 cases by contrast enhanced ultrasound (CES), while two patients showed reduced vascularity on CES. In 10 patients, lesions were confirmed by contrast enhanced CT. Histological examination was performed in three patients with the diagnosis of capillary haemangioma (n = 2) and hamartoma (n = 1). In the remaining cases, ultrasound follow-up was performed (range 4 months to 13 years) and demonstrated no evidence of tumour growth in all but one patient. During a 4 year follow-up, one lesion increased in size from 1.0 cm to 1.5 cm and in the same patient an additional 0.5 cm sized hypoechoic increased vascular lesion was also found. In the spleen a hypoechoic lesion with an increased vascular pattern incidentally found by ultrasound most likely indicates a benign tumour with capillary haemangioma/hamartoma as the most likely diagnosis. However, it should be emphasised that in all cases a careful ultrasound follow-up is warranted.
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Affiliation(s)
- C Görg
- Medizinische Universitätsklinik, Baldingerstrasse, 35043 Marburg/Lahn, Germany
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Hassan I, Barth P, Celik I, Hoffmann S, Langer P, Ramaswamy A, Wagner HJ, Rothmund M, Zielke A. An authentic malignant epithelioid hemangioendothelioma of the thyroid: a case report and review of the literature. Thyroid 2005; 15:1377-81. [PMID: 16405412 DOI: 10.1089/thy.2005.15.1377] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Hemangioendotheliomas of the thyroid are neoplasms that are rarely encountered in the Alpine region in Europe. The endemic goiter in this iodine-deficient region can be considered as a predisposing factor. We report the second case of an epithelioid hemangioendothelioma (EHE) of the thyroid gland and the first clinical case with malignant behavior. A 73-year-old woman with a long history of multinodular goiter presented with a rapidly growing thyroid mass, free of distant metastases. A total thyroidectomy was performed. Histologically the lesion had characteristic epithelioid and spindle cell proliferation in a background of chondromyxoid stroma. Cytoplasmic vacuolization in the epithelioid and spindle cells were present. Tumor cells were positive for factor VIII-related antigen, MNF116, PAN-ceratin, CD 34, and CD 31 and negative for cytokeratin allowing the diagnosis of EHE. Nine months after the primary resection the tumor locally recurred. A palliative resection was performed in a second operation followed by interferon-alpha therapy. The patient rapidly developed a second local relapse and died 13 months after the diagnosis of an EHE had been made. An improvement of the very poor prognosis of this rare tumor may depend on early tumor diagnosis and surgery combined with a multimodal treatment.
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Affiliation(s)
- I Hassan
- Department of Surgery, Philipps-University of Marburg, 35033 Marburg, Germany.
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Dünne AA, Gröbe A, Sesterhenn AM, Barth P, Dalchow C, Werner JA. Influence of matrix metalloproteinase 9 (MMP-9) on the metastatic behavior of oropharyngeal cancer. Anticancer Res 2005; 25:4129-34. [PMID: 16309207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
BACKGROUND The role of the single matrix metalloproteinases (MMPs) in the metastatic process of squamous cell carcinomas (SCC) is still obscure. MATERIALS AND METHODS The MMP-9 expression was described immunohistochemically in 105 patients (40-79 years of age, mean: 57.84 years; 84 male, 21 female) suffering from orophatyngeal cancer (22x TI, 31x T2, 24x T3, 28x T4) with different neck stages (41x N0, 6x N1, 54x N2, 4x N3 neck). RESULTS A significant correlation between MMP-9 expression and T stage (p < 0.05), N stage (r = 0.55, p < 0.01) and UICC stage (r = 0.55, p < 0.01) was revealed. Most remarkable was the high MMP-9 expression with simultaneously high UICC stages. CONCLUSION The results give further indication that MMP-9 plays a role in the metastatic behavior of oropharyngeal SCC. It will be a project for the near future to create a standardized evaluation score of immuno-histological stainings to allow valid comparison of the results and published data.
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Affiliation(s)
- A A Dünne
- Department of Otolaryngology, Head and Neck Surgery, Philipps University of Marburg, Marburg, Germany
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Hegele A, Dalpke A, Heeg K, Barth P, Varga Z, Hofmann R, Olbert P. Immunostimulatory CpG oligonucleotides reduce tumor burden after intravesical administration in an orthotopic murine bladder cancer model. Tumour Biol 2005; 26:274-80. [PMID: 16103747 DOI: 10.1159/000087380] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 02/06/2005] [Accepted: 05/06/2005] [Indexed: 11/19/2022] Open
Abstract
Bacillus Calmette-Guérin is established in the prophylaxis of recurrent intermediate and high-risk superficial bladder cancer and induces an unspecific, Th1-biased local immune response. Small CpG oligonucleotides (CpG ODN) containing a central unmethylated CpG motif are able to mimic the immunostimulatory activity of bacterial DNA. The purpose of the present study was to evaluate the antineoplastic properties of intravesically administered CpG ODN in an orthotopic murine bladder cancer model. MB49 tumor cell suspension was instilled transurethrally in female C57/BL6 mice on day 0. Mice were divided in three groups of 12 animals. Four mice in each group received either stimulative CpG ODN, non-stimulative GpC ODN or PBS intravesically: group I on day 3, group II on day 5, group III on day 7. After sacrifice 7 days after treatment, bladders were removed and histological examinations were performed. Single instillation of CpG ODN revealed antineoplastic effects in every group demonstrated by significantly lower bladder weight compared with non-stimulative GpC ODN- and PBS-treated mice. Histological examination showed extensive infiltration of macrophages and lymphocytes in CpG ODN-treated mice, whereas PBS- and GpC ODN-treated mice showed solid tumor growth with only few leucocytes. Intravesically applied immunostimulative DNA demonstrated antitumoral activity in an orthotopic murine bladder cancer model. A single instillation seems to be sufficient to reduce tumor load.
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Affiliation(s)
- A Hegele
- Department of Urology and Pediatric Urology, Philipps University Marburg, Marburg, Germany.
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Gratz S, Barth P, Arnold R, Behr TM. Graves' disease with unilateral radioisotope uptake. Nuklearmedizin 2004; 43:N66-8. [PMID: 15536692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Affiliation(s)
- S Gratz
- Department of Nuclear Medicine, Philipps-University of Marburg, Germany
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Göke R, Barth P, Schmidt A, Samans B, Lankat-Buttgereit B. Programmed cell death protein 4 suppresses CDK1/cdc2 via induction of p21(Waf1/Cip1). Am J Physiol Cell Physiol 2004; 287:C1541-6. [PMID: 15317660 DOI: 10.1152/ajpcell.00025.2004] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We show that the recently discovered tumor suppressor pdcd4 represses the transcription of the mitosis-promoting factor cyclin-dependent kinase (CDK)1/cdc2 via upregulation of p21(Waf1/Cip1). p21(Waf1/Cip1) inhibits CDK4/6 and CDK2. Decrease of CDK4/6 and CDK2 enhances the binding of pRb to E2F/DP, which in turn together bind to and repress the cdc2 promoter. Upregulation of CDK1/cdc2 accompanied by a malignant change was previously reported in colon cancer. We show that expression of pdcd4 as an indirect suppressor of CDK1/cdc2 is lost in progressed carcinomas of lung, breast, colon, and prostate. Furthermore, it seems that localization and expression of pdcd4 directly correlate with tumor progression. Finally, the CDK1/cdc2 inhibitor roscovitine reduces the proliferation of several tumor cell lines, suggesting that inhibition of CDK1/cdc2 may be a useful strategy against malignant transformation. Therefore, pdcd4 might serve as a novel target for antineoplastic therapies.
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Affiliation(s)
- R Göke
- Clinical Research Unit, University Hospital of Marburg, Baldingerstrasse, D-35033 Marburg, Germany.
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Howard EI, Sanishvili R, Cachau RE, Mitschler A, Chevrier B, Barth P, Lamour V, Van Zandt M, Sibley E, Bon C, Moras D, Schneider TR, Joachimiak A, Podjarny A. Ultrahigh resolution drug design I: details of interactions in human aldose reductase-inhibitor complex at 0.66 A. Proteins 2004; 55:792-804. [PMID: 15146478 DOI: 10.1002/prot.20015] [Citation(s) in RCA: 228] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The first subatomic resolution structure of a 36 kDa protein [aldose reductase (AR)] is presented. AR was cocrystallized at pH 5.0 with its cofactor NADP+ and inhibitor IDD 594, a therapeutic candidate for the treatment of diabetic complications. X-ray diffraction data were collected up to 0.62 A resolution and treated up to 0.66 A resolution. Anisotropic refinement followed by a blocked matrix inversion produced low standard deviations (<0.005 A). The model was very well ordered overall (CA atoms' mean B factor is 5.5 A2). The model and the electron-density maps revealed fine features, such as H-atoms, bond densities, and significant deviations from standard stereochemistry. Other features, such as networks of hydrogen bonds (H bonds), a large number of multiple conformations, and solvent structure were also better defined. Most of the atoms in the active site region were extremely well ordered (mean B approximately 3 A2), leading to the identification of the protonation states of the residues involved in catalysis. The electrostatic interactions of the inhibitor's charged carboxylate head with the catalytic residues and the charged coenzyme NADP+ explained the inhibitor's noncompetitive character. Furthermore, a short contact involving the IDD 594 bromine atom explained the selectivity profile of the inhibitor, important feature to avoid toxic effects. The presented structure and the details revealed are instrumental for better understanding of the inhibition mechanism of AR by IDD 594, and hence, for the rational drug design of future inhibitors. This work demonstrates the capabilities of subatomic resolution experiments and stimulates further developments of methods allowing the use of the full potential of these experiments.
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Affiliation(s)
- E I Howard
- Laboratoire de Génomique et de Biologie Structurales, UMR 7104 du CNRS, IGBMC, Illkirch, France
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Hasse C, Brune M, Lorenz W, Barth P, Metzler W, Breves G, Sitter H. Functional parameters before and after parathyroidectomy: a prospective, randomized long-term trial on different rat strains. Exp Clin Endocrinol Diabetes 2004; 112:364-72. [PMID: 15239021 DOI: 10.1055/s-2004-821027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
For clinical controls before and after parathyroidectomy and for evaluation of the function of transplants of parathyroid tissue, it is necessary to establish standard values of relevant laboratory parameters for donor and recipient animals as well as for different types of nutrition. Since no such data are yet available, it was the purpose to define such standards. In a prospective randomized trial on 400 rats of the Dark Agouti (DA) and Lewis strain, different functional laboratory parameters such as total calcium, intact parathyroid hormone, phosphate, 1.25-dihydroxyvitamin D, and alkaline phosphatase were measured under a standard and low calcium diet over a period of 40 weeks. Two hundred of these animals underwent a parathyroidectomy four weeks after the beginning of the study and specimens were evaluated histologically. For all eight different study groups normal values could be defined within tight limits for parameters which describe the function of the parathyroid gland or elements of calcium metabolism under different conditions. The optimal conditions for a transplantation model of parathyroid glands were established. Lewis-rats were identified as the ideal donor and DA rats as the better recipient animals. These data can serve as reference values for future studies on transplantation of the parathyroid without immunosuppression.
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Affiliation(s)
- C Hasse
- Department of Visceral, Thoracic and Vascular Surgery, Philipps-University Marburg, Marburg, Germany
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Sesterhenn AM, Teymoortash A, Szalay A, Hecht D, Barth P, Werner JA. Fernmetastasierung von Plattenepithelkarzinomen des Kopf-Hals Bereiches–ein Vergleich autoptischer Befunde mit klinisch-radiologischen Diagnosen. Laryngorhinootologie 2004. [DOI: 10.1055/s-2004-823528] [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: 10/19/2022]
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Rosche B, Jacobsen M, Cepok S, Barth P, Sommer N, Hemmer B. Case report: myositis in a patient with LGL leukemia. Akt Neurol 2004. [DOI: 10.1055/s-2004-833425] [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: 10/28/2022]
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Abstract
DsbA is the primary catalyst of disulfide bond formation in the periplasm of gram-negative bacteria. Numerous theoretical and experimental studies have been undertaken to determine the molecular mechanisms by which DsbA acts as a potent oxidant, whereas the homologous cytoplasmic protein, thioredoxin, acts as a reductant. Many of these studies have focused on the nature of the two residues that lie between the active-site cysteines. Although these are clearly important, they are not solely responsible for the differences in activity between these thiol-disulfide oxidoreductases. Q97 in the helical domain of E. coli DsbA has been implicated in influencing the redox potential of E. coli DsbA. In V. cholerae DsbA, the analogous residue is H94. In this study, the effect of H94 on the oxidase activity of DsbA is examined, along with the role of the conserved cis-proline residue P149. The DsbA mutant H94L shows a nearly fourfold increase in activity over the wild-type enzyme. To our knowledge, this is the first time an increase in the normal activity of a thiol-disulfide oxidoreductase has been reported. Potential reasons for this increase in activity are discussed.
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Affiliation(s)
- J Blank
- Zeneca Pharmacuticals, Mereside, Alderley Park, Macclesfield SK10 4TG, U.K
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Vollrath F, Barth P, Basedow A, Engström W, List H. Local tolerance to spider silks and protein polymers in vivo. In Vivo 2002; 16:229-34. [PMID: 12224131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Spider silks were implanted subcutaneously in pigs for a study of the tolerance against this material. Four types of spider silks of high purity and cleanliness were implanted: (i) major ampullate dragline silk reeled from the golden silk spider Nephila clavipes, (ii) native (unsterilised) silk reeled from a Brachypelma spider, (iii) native silk taken from this spider's web and (iv) its web silk thermally treated at 80 degrees C. For comparison we used fibrous silk analogue protein polymers and four already marketed wound dressings (polyurethane film, collagen dressings, gauze pads). All materials were applied epicutaneously to split skin wounds. The implants were examined macroscopically as well as by light microscopy. Superficially, all sites healed rapidly. There were marked inflammatory reactions in all sites with lympho-plasmacellular infiltrations, evidence of phagocytosis and granuloma formation as indicated by the appearance of giant cells. However there was a marked absence of epitheloid cells indicating that the observed reaction was a foreign body granuloma. Furthermore, the histopathological images recorded after 14 days revealed no marked differences between the dressings. Polyurethane films, however, seemed to be superior with respect to the duration of the wound healing process.
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Affiliation(s)
- F Vollrath
- Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, England
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Greib C, Koehler U, Barth P, Heinemann A, Walthers E. [A rare cause of recurrent hemoptysis. Unilateral pulmonary arterial hypoplasia as a cause of recurrent hemoptysis and bronchitis]. Internist (Berl) 2002; 43:665-9. [PMID: 12085537 DOI: 10.1007/s00108-001-0459-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- C Greib
- Klinik für Innere Medizin, Schwerpunkt Pneumologie, Philipps-Universität Marburg
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Görg C, Barth P, Backhus J, Boecker J, Neubauer A. [Sonographic patterns of littoral cell angioma: case report and review of the literature]. Ultraschall Med 2001; 22:191-194. [PMID: 11524699 DOI: 10.1055/s-2001-16811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
AIM Littoral cell angioma is a rare benign tumour of vascular proliferation unique to the spleen. Definitive sonographic patterns are yet unknown and are described in this paper. METHOD We report about 2 patients with histologically confirmed Littoral cell angioma. The sonographic features of these and 5 additional cases in the literature are presented. RESULTS Littoral cell angioma is characterized by splenomegaly (6 out of 7 cases) with small nodular hyperechoic focal lesions (6 out of 7 cases). A solitary hyperechoic tumour (1 out of 7 cases) is a rare event. CONCLUSION Littoral cell angioma is a recently discovered tumour and should be included in the differential diagnosis of a hyperechoic splenic tumour.
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Affiliation(s)
- C Görg
- Zentrum für Innere Medizin, Marburg, Germany
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Steiniger B, Barth P, Hellinger A. The perifollicular and marginal zones of the human splenic white pulp : do fibroblasts guide lymphocyte immigration? Am J Pathol 2001; 159:501-12. [PMID: 11485909 PMCID: PMC1850570 DOI: 10.1016/s0002-9440(10)61722-1] [Citation(s) in RCA: 98] [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] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We investigate the white pulp compartments of 73 human spleens and demonstrate that there are several microanatomical peculiarities in man that do not occur in rats or mice. Humans lack a marginal sinus separating the marginal zone (MZ) from the follicles or the follicular mantle zone. The MZ is divided into an inner and an outer compartment by a special type of fibroblasts. An additional compartment, termed the perifollicular zone, is present between the follicular MZ and the red pulp. The perifollicular zone contains sheathed capillaries and blood-filled spaces without endothelial lining. In the perifollicular zone, in the outer MZ, and in the T cell zone fibroblasts of an unusual phenotype occur. These cells stain for the adhesion molecules MAdCAM-1, VCAM-1 (CD106), and VAP-1; the Thy-1 (CD90) molecule; smooth muscle alpha-actin and smooth muscle myosin; cytokeratin 18; and thrombomodulin (CD141). They are, however, negative for the peripheral node addressin, the cutaneous lymphocyte antigen, CD34, PECAM-1 (CD31), and P- and E-selectin (CD62P and CD62E). In the MZ the fibroblasts are often tightly associated with CD4-positive T lymphocytes, whereas CD8-positive cells are almost absent. Our findings lead to the hypothesis, that recirculating CD4-positive T lymphocytes enter the human splenic white pulp from the open circulation of the perifollicular zone without crossing an endothelium. Specialized fibroblasts may attract these T cells and guide them into the periarteriolar T cell area.
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Affiliation(s)
- B Steiniger
- Institute of Anatomy and Cell Biology, University of Marburg, Robert-Koch-Str. 6, D-35033 Marburg, Germany.
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Abstract
Background
—Blood flow can be quantified noninvasively by phase-contrast cine MRI (PC-MRI) in adults. Little is known about the feasibility of the method in children with congenital heart disease.
Methods and Results
—In 50 children (mean age 6.2 years, range 1.1 to 17.7 years) with an atrial- or ventricular-level shunt, blood flow rate in the great vessels was determined by PC-MRI, and the ratio of pulmonary to aortic flow (Q̇p/Q̇s) was compared with Q̇p/Q̇s by oximetry. We found a difference of 2% and a range of −20% to +26% (limits of agreement, mean±2 SD). In another 7 children with congenital heart disease but no cardiac shunting (mean age 7.9 years, range 1.3 to 13.5 years), Q̇p/Q̇s by PC-MRI was 1.02 (SD ±0.06). No difference between systemic venous and aortic flow volumes was found (range −17% to +20%, n=37). Blood flow through a secundum atrial septal defect as assessed by PC-MRI (n=24) overestimated the shunt compared with the difference between pulmonary and aortic flows. The mean difference between 3 repeated PC-MRI measurements in each location was 5.3% (SD ±4.0%, n=522), demonstrating good precision. The interobserver variability was low. The accuracy of PC-MRI was confirmed by in vitro experiments.
Conclusions
—Determination of Q̇p/Q̇s by PC-MRI in children is quick, safe, and reliable compared with oximetry. Systemic venous flow can be quantified by PC-MRI, whereas through-plane shunt measurement within an atrial septal defect is inaccurate.
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Affiliation(s)
- P Beerbaum
- Clinic for Congenital Heart Disease, Heart and Diabetes Center, North Rhine-Westfalia, Ruhr-University Bochum, Germany.
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