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Filin AA, Baru V, Epelbaum E, Krebs H, Möller D, Reinert P. Extraction of the Neutron Charge Radius from a Precision Calculation of the Deuteron Structure Radius. Phys Rev Lett 2020; 124:082501. [PMID: 32167344 DOI: 10.1103/physrevlett.124.082501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
We present a high-accuracy calculation of the deuteron structure radius in chiral effective field theory. Our analysis employs the state-of-the-art semilocal two-nucleon potentials and takes into account two-body contributions to the charge density operators up to fifth order in the chiral expansion. The strength of the fifth-order short-range two-body contribution to the charge density operator is adjusted to the experimental data on the deuteron charge form factor. A detailed error analysis is performed by propagating the statistical uncertainties of the low-energy constants entering the two-nucleon potentials and by estimating errors from the truncation of the chiral expansion as well as from uncertainties in the nucleon form factors. Using the predicted value for the deuteron structure radius together with the very accurate atomic data for the difference of the deuteron and proton charge radii we, for the first time, extract the charge radius of the neutron from light nuclei. The extracted value reads r_{n}^{2}=-0.106_{-0.005}^{+0.007} fm^{2} and its magnitude is about 1.7σ smaller than the current value given by the Particle Data Group. In addition, given the high accuracy of the calculated deuteron charge form factor and its careful and systematic error analysis, our results open the way for an accurate determination of the nucleon form factors from elastic electron-deuteron scattering data measured at the Mainz Microtron and other experimental facilities.
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Affiliation(s)
- A A Filin
- Ruhr-Universität Bochum, Fakultät für Physik und Astronomie, Institut für Theoretische Physik II, D-44780 Bochum, Germany
| | - V Baru
- Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany
- Institute for Theoretical and Experimental Physics NRC "Kurchatov Institute", Moscow 117218, Russia
- P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991, Leninskiy Prospect 53, Moscow, Russia
| | - E Epelbaum
- Ruhr-Universität Bochum, Fakultät für Physik und Astronomie, Institut für Theoretische Physik II, D-44780 Bochum, Germany
| | - H Krebs
- Ruhr-Universität Bochum, Fakultät für Physik und Astronomie, Institut für Theoretische Physik II, D-44780 Bochum, Germany
| | - D Möller
- Ruhr-Universität Bochum, Fakultät für Physik und Astronomie, Institut für Theoretische Physik II, D-44780 Bochum, Germany
| | - P Reinert
- Ruhr-Universität Bochum, Fakultät für Physik und Astronomie, Institut für Theoretische Physik II, D-44780 Bochum, Germany
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Möller D, Kushnir S, Grote M, Ismail-Ali A, Koopmans KRM, Calo F, Heinrich S, Diehl B, Schulz F. Flexible enzymatic activation of artificial polyketide extender units by Streptomyces cinnamonensis into the monensin biosynthetic pathway. Lett Appl Microbiol 2018; 67:226-234. [PMID: 29927502 DOI: 10.1111/lam.13039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 06/18/2018] [Accepted: 06/18/2018] [Indexed: 11/30/2022]
Abstract
Streptomyces cinnamonensis A495 is a variant of the monensin producer which instead of the native polyether antibiotic gives rise to antibiotic and anti-tumour shunt-product premonensin. Through the supplementation of the fermentation medium with suitable precursors, premonensin can be derivatized via the incorporation of new-to-nature extender units into the biosynthetic machinery. Polyketide extender units require activation, typically in form of coenzyme A-thioesters. These are membrane impermeable and thus in the past an artificial mimic was employed. Here, we show the use and preliminary characterization of a highly substrate promiscuous new enzyme for the endogenous thioester formation in a Streptomyces strain. These intracellularly activated alternative extender units are significantly better incorporated into premonensin than the synthetically activated counterparts. SIGNIFICANCE AND IMPACT OF THE STUDY Polyketide natural products are of enormous relevance in medicine. The hit-rate in finding active compounds for the potential treatment of various diseases among this substance family of microbial origin is high. However, most polyketides require derivatization to render them suitable for the application. Of relevance in this field is the incorporation of artificial substances into the biogenesis of polyketides, hampered by both the microbial metabolism and the complexity of the enzymes involved. This manuscript describes the straightforward and selective biosynthetic incorporation of synthetic substances into a reduced polyketide and showcases a promising new enzyme to aid this purpose.
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Affiliation(s)
- D Möller
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - S Kushnir
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - M Grote
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - A Ismail-Ali
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - K R M Koopmans
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - F Calo
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - S Heinrich
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
| | - B Diehl
- Spectral Service, Köln, Germany
| | - F Schulz
- Organische Chemie 1, Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum, Bochum, Germany
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Schmidt-Richberg A, Fiehler J, Illies T, Möller D, Handels H, Säring D, Forkert ND. Fuzzy-based Vascular Structure Enhancement in Time-of-Flight MRA Images for Improved Segmentation. Methods Inf Med 2018; 50:74-83. [DOI: 10.3414/me10-02-0003] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Accepted: 08/26/2010] [Indexed: 11/09/2022]
Abstract
Summary
Objectives: Cerebral vascular malformations might lead to strokes due to occurrence of ruptures. The rupture risk is highly related to the individual vascular anatomy. The 3D Time-of-Flight (TOF) MRA technique is a commonly used non-invasive imaging technique for exploration of the vascular anatomy. Several clinical applications require exact cerebrovascular segmentations from this image sequence. For this purpose, intensity-based segmentation approaches are widely used. Since small low-contrast vessels are often not detected, vesselness filter-based segmentation schemes have been proposed, which contrari-wise have problems detecting malformed vessels. In this paper, a fuzzy logic-based method for fusion of intensity and vesselness information is presented, allowing an improved segmentation of malformed and small vessels at preservation of advantages of both approaches.
Methods: After preprocessing of a TOF dataset, the corresponding vesselness image is computed. The role of the fuzzy logic is to voxel-wisely fuse the intensity information from the TOF dataset with the corresponding vesselness information based on an analytically designed rule base. The resulting fuzzy parame ter image can then be used for improved cerebrovascular segmentation.
Results: Six datasets, manually segmented by medical experts, were used for evaluation. Based on TOF, vesselness and fused fuzzy parameter images, the vessels of each patient were segmented using optimal thresholds computed by maximizing the agreement to manual segmentations using the Tanimoto coefficient. The results showed an overall improvement of 0.054 (fuzzy vs. TOF) and 0.079 (fuzzy vs. vesselness). Furthermore, the evaluation has shown that the method proposed yields better results than statistical Bayes classification.
Conclusion: The proposed method can automatically fuse the benefits of intensity and vesselness information and can improve the results of following cerebrovascular segmentations.
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Fish I, Stößel A, Eitel K, Valant C, Albold S, Huebner H, Möller D, Clark MJ, Sunahara RK, Christopoulos A, Shoichet BK, Gmeiner P. Structure-Based Design and Discovery of New M 2 Receptor Agonists. J Med Chem 2017; 60:9239-9250. [PMID: 29094937 DOI: 10.1021/acs.jmedchem.7b01113] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Muscarinic receptor agonists are characterized by apparently strict restraints on their tertiary or quaternary amine and their distance to an ester or related center. On the basis of the active state crystal structure of the muscarinic M2 receptor in complex with iperoxo, we explored potential agonists that lacked the highly conserved functionalities of previously known ligands. Using structure-guided pharmacophore design followed by docking, we found two agonists (compounds 3 and 17), out of 19 docked and synthesized compounds, that fit the receptor well and were predicted to form a hydrogen-bond conserved among known agonists. Structural optimization led to compound 28, which was 4-fold more potent than its parent 3. Fortified by the discovery of this new scaffold, we sought a broader range of chemotypes by docking 2.2 million fragments, which revealed another three micromolar agonists unrelated either to 28 or known muscarinics. Even pockets as tightly defined and as deeply studied as that of the muscarinic reveal opportunities for the structure-based design and the discovery of new chemotypes.
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Affiliation(s)
- Inbar Fish
- Department of Pharmaceutical Chemistry, University of California, San Francisco , San Francisco, California 94158, United States.,Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel-Aviv University , Ramat Aviv, Israel
| | - Anne Stößel
- Department of Chemistry and Pharmacy, Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University , Schuhstraße 19, 91052 Erlangen, Germany
| | - Katrin Eitel
- Department of Chemistry and Pharmacy, Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University , Schuhstraße 19, 91052 Erlangen, Germany
| | - Celine Valant
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University , Parkville Victoria 3052, Australia
| | - Sabine Albold
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University , Parkville Victoria 3052, Australia
| | - Harald Huebner
- Department of Chemistry and Pharmacy, Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University , Schuhstraße 19, 91052 Erlangen, Germany
| | - Dorothee Möller
- Department of Chemistry and Pharmacy, Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University , Schuhstraße 19, 91052 Erlangen, Germany
| | - Mary J Clark
- Department of Pharmacology, University of California, San Diego , La Jolla, California 92093, United States
| | - Roger K Sunahara
- Department of Pharmacology, University of California, San Diego , La Jolla, California 92093, United States
| | - Arthur Christopoulos
- Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University , Parkville Victoria 3052, Australia
| | - Brian K Shoichet
- Department of Pharmaceutical Chemistry, University of California, San Francisco , San Francisco, California 94158, United States
| | - Peter Gmeiner
- Department of Chemistry and Pharmacy, Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University , Schuhstraße 19, 91052 Erlangen, Germany
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Männel B, Jaiteh M, Zeifman A, Randakova A, Möller D, Hübner H, Gmeiner P, Carlsson J. Structure-Guided Screening for Functionally Selective D 2 Dopamine Receptor Ligands from a Virtual Chemical Library. ACS Chem Biol 2017; 12:2652-2661. [PMID: 28846380 DOI: 10.1021/acschembio.7b00493] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Functionally selective ligands stabilize conformations of G protein-coupled receptors (GPCRs) that induce a preference for signaling via a subset of the intracellular pathways activated by the endogenous agonists. The possibility to fine-tune the functional activity of a receptor provides opportunities to develop drugs that selectively signal via pathways associated with a therapeutic effect and avoid those causing side effects. Animal studies have indicated that ligands displaying functional selectivity at the D2 dopamine receptor (D2R) could be safer and more efficacious drugs against neuropsychiatric diseases. In this work, computational design of functionally selective D2R ligands was explored using structure-based virtual screening. Molecular docking of known functionally selective ligands to a D2R homology model indicated that such compounds were anchored by interactions with the orthosteric site and extended into a common secondary pocket. A tailored virtual library with close to 13 000 compounds bearing 2,3-dichlorophenylpiperazine, a privileged orthosteric scaffold, connected to diverse chemical moieties via a linker was docked to the D2R model. Eighteen top-ranked compounds that occupied both the orthosteric and allosteric site were synthesized, leading to the discovery of 16 partial agonists. A majority of the ligands had comparable maximum effects in the G protein and β-arrestin recruitment assays, but a subset displayed preference for a single pathway. In particular, compound 4 stimulated β-arrestin recruitment (EC50 = 320 nM, Emax = 16%) but had no detectable G protein signaling. The use of structure-based screening and virtual libraries to discover GPCR ligands with tailored functional properties will be discussed.
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Affiliation(s)
- Barbara Männel
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University, Schuhstraße 19, 91052 Erlangen, Germany
| | - Mariama Jaiteh
- Science
for Life Laboratory, Department of Cell and Molecular Biology, Uppsala University, BMC, Box 596, SE-751 24 Uppsala, Sweden
| | - Alexey Zeifman
- Science
for Life Laboratory, Department of Cell and Molecular Biology, Uppsala University, BMC, Box 596, SE-751 24 Uppsala, Sweden
| | - Alena Randakova
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University, Schuhstraße 19, 91052 Erlangen, Germany
| | - Dorothee Möller
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University, Schuhstraße 19, 91052 Erlangen, Germany
| | - Harald Hübner
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University, Schuhstraße 19, 91052 Erlangen, Germany
| | - Peter Gmeiner
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University, Schuhstraße 19, 91052 Erlangen, Germany
| | - Jens Carlsson
- Science
for Life Laboratory, Department of Cell and Molecular Biology, Uppsala University, BMC, Box 596, SE-751 24 Uppsala, Sweden
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Seibt R, Möller D, Kreuzfeld S, Stoll R, Hunger B. Auswirkungen der 12-Stunden-Schichtarbeit auf Gesundheit, Schlaf und Work-Life-Balance von Maschinen- und Anlagenführern im Längsschnitt. Das Gesundheitswesen 2017. [DOI: 10.1055/s-0037-1605898] [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: 10/18/2022]
Affiliation(s)
- R Seibt
- Universitätsmedizin Rostock, Institut für Präventivmedizin, Rostock
- Universität Rostock, Center for Life Science Automation (CELISCA), Rostock
| | - D Möller
- THUMEDI-Präventionsmanagement GmbH, Thum-Jahnsbach
| | - S Kreuzfeld
- Universitätsmedizin Rostock, Institut für Präventivmedizin, Rostock
| | - R Stoll
- Universitätsmedizin Rostock, Institut für Präventivmedizin, Rostock
| | - B Hunger
- Berufsgenossenschaft Nahrungsmittel und Gastgewerbe, ASD*BGN, Koordinationsstelle Potsdam, Potsdam
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Männel B, Dengler D, Shonberg J, Hübner H, Möller D, Gmeiner P. Hydroxy-Substituted Heteroarylpiperazines: Novel Scaffolds for β-Arrestin-Biased D2R Agonists. J Med Chem 2017; 60:4693-4713. [DOI: 10.1021/acs.jmedchem.7b00363] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Barbara Männel
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Daniela Dengler
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Jeremy Shonberg
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Harald Hübner
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Dorothee Möller
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Peter Gmeiner
- Department of Chemistry and
Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nuernberg, Schuhstraße 19, 91052 Erlangen, Germany
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Möller D, Banerjee A, Uzuneser TC, Skultety M, Huth T, Plouffe B, Hübner H, Alzheimer C, Friedland K, Müller CP, Bouvier M, Gmeiner P. Discovery of G Protein-Biased Dopaminergics with a Pyrazolo[1,5-a]pyridine Substructure. J Med Chem 2017; 60:2908-2929. [DOI: 10.1021/acs.jmedchem.6b01857] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Dorothee Möller
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Ashutosh Banerjee
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Taygun C. Uzuneser
- Department
of Psychiatry and Psychotherapy, Friedrich-Alexander University Erlangen-Nürnberg, Schwabachanlage 6, 91054 Erlangen, Germany
| | - Marika Skultety
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Tobias Huth
- Institute
of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstraße 17, 91054 Erlangen, Germany
| | - Bianca Plouffe
- Institute
for Research in Immunology and Cancer (IRIC), Department of Biochemistry
and Molecular Medicine, University of Montreal, Québec, Canada H3C 1J4
| | - Harald Hübner
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen, Germany
| | - Christian Alzheimer
- Institute
of Physiology and Pathophysiology, Friedrich-Alexander University Erlangen-Nürnberg, Universitätsstraße 17, 91054 Erlangen, Germany
| | - Kristina Friedland
- Department
of Chemistry and Pharmacy, Molecular and Clinical Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Cauerstraße 4, 91058 Erlangen, Germany
| | - Christian P. Müller
- Department
of Psychiatry and Psychotherapy, Friedrich-Alexander University Erlangen-Nürnberg, Schwabachanlage 6, 91054 Erlangen, Germany
| | - Michel Bouvier
- Institute
for Research in Immunology and Cancer (IRIC), Department of Biochemistry
and Molecular Medicine, University of Montreal, Québec, Canada H3C 1J4
| | - Peter Gmeiner
- Department
of Chemistry and Pharmacy, Medicinal Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen, Germany
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Hübner H, Schellhorn T, Gienger M, Schaab C, Kaindl J, Leeb L, Clark T, Möller D, Gmeiner P. Structure-guided development of heterodimer-selective GPCR ligands. Nat Commun 2016; 7:12298. [PMID: 27457610 PMCID: PMC4963535 DOI: 10.1038/ncomms12298] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Accepted: 06/16/2016] [Indexed: 12/18/2022] Open
Abstract
Crystal structures of G protein-coupled receptor (GPCR) ligand complexes allow a rational design of novel molecular probes and drugs. Here we report the structure-guided design, chemical synthesis and biological investigations of bivalent ligands for dopamine D2 receptor/neurotensin NTS1 receptor (D2R/NTS1R) heterodimers. The compounds of types 1–3 consist of three different D2R pharmacophores bound to an affinity-generating lipophilic appendage, a polyethylene glycol-based linker and the NTS1R agonist NT(8-13). The bivalent ligands show binding affinity in the picomolar range for cells coexpressing both GPCRs and unprecedented selectivity (up to three orders of magnitude), compared with cells that only express D2Rs. A functional switch is observed for the bivalent ligands 3b,c inhibiting cAMP formation in cells singly expressing D2Rs but stimulating cAMP accumulation in D2R/NTS1R-coexpressing cells. Moreover, the newly synthesized bivalent ligands show a strong, predominantly NTS1R-mediated β-arrestin-2 recruitment at the D2R/NTS1R-coexpressing cells. G protein-coupled receptors (GPCRs) are involved in key signalling pathways and represent important targets for the treatment of neurological and psychiatric disorders. Here, the authors describe powerful bivalent ligands that efficiently bind to therapeutically relevant GPCR heterodimers
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Affiliation(s)
- Harald Hübner
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Tamara Schellhorn
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Marie Gienger
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Carolin Schaab
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Jonas Kaindl
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany.,Department of Chemistry and Pharmacy, Computer-Chemie-Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nägelsbachstraße 25, Erlangen 91052, Germany
| | - Laurin Leeb
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Timothy Clark
- Department of Chemistry and Pharmacy, Computer-Chemie-Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Nägelsbachstraße 25, Erlangen 91052, Germany.,Centre for Molecular Design, University of Portsmouth, King Henry Building, Portsmouth PO1 2DY, UK
| | - Dorothee Möller
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
| | - Peter Gmeiner
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schuhstraße 19, Erlangen 91052, Germany
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Rensing N, Westermann A, Möller D, von Piekartz H. [Effects of Reactive Jump Training in Handball Players Regarding Jump Height and Power Development in the Triceps Surae Muscle]. Sportverletz Sportschaden 2015; 29:236-43. [PMID: 26579625 DOI: 10.1055/s-0041-106947] [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: 10/22/2022]
Abstract
BACKGROUND Studies have shown changes in the technical and physical demands in modern handball. The game has increased considerably in speed, power and dynamics. Jump training has, therefore, become ever more important in the training of the athletes. These developments contribute to the fact that handball is now one of the most injury-prone types of sport, with the lower extremities being most frequently affected. Reactive jump training is not only used in training by now, but also increasingly in injury prevention. The aim of this study was to investigate the effectiveness of reactive jump training with handball players. MATERIAL AND METHODS 21 regional league handball players were randomly divided into an intervention group (n = 12) and a control group (n = 9). The intervention group completed a six-week reactive jump training programme while the control group went through a non-specific training programme. Jump height (squat and counter movement jump), isokinetic and isometric maximum power as well as muscle activity served as measuring parameters. RESULTS A comparison of the intervention and control groups revealed that the reactive jump training led to significant improvements in jump height. The isometric and isokinetic maximum power measurements and the electromyographic activities of the triceps surae muscle demonstrated an improvement in the values within the intervention group. However, this improvement was not significant compared with the control group. Likewise both jumps correlated with the muscle activity of the soleus muscle as shown by electromyography. A moderate correlation was noticed between the isokinetic maximum power measurement and the electromyographic activity of the soleus and gastrocnemius medialis muscles. Furthermore, the correlations of the isometric and isokinetic maximum power meas-urements resulted in a strong correlation coefficient. CONCLUSION This study revealed a significant increase in jump height after reactive jump training. There was no significant difference in power development between the two groups. However, we were able to demonstrate correlations which would make it seem reasonable and interesting to investigate the question more closely. An interesting field of research could be the question of the effectiveness of reactive jump training in the areas of rehabilitation and injury prevention.
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Möller D, Gmeiner P. Die Rhodopsin‐Arrestin‐Kristallstruktur und ihre Bedeutung für die Entwicklung funktionell selektiver GPCR‐Wirkstoffe. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507724] [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: 11/11/2022]
Affiliation(s)
- Dorothee Möller
- Department Chemie und Pharmazie, Friedrich‐Alexander Universität Erlangen‐Nürnberg, Schuhstraße 19, 91052 Erlangen (Deutschland)
| | - Peter Gmeiner
- Department Chemie und Pharmazie, Friedrich‐Alexander Universität Erlangen‐Nürnberg, Schuhstraße 19, 91052 Erlangen (Deutschland)
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Möller D, Gmeiner P. Arrestin-Bound Rhodopsin: A Molecular Structure and its Impact on the Development of Biased GPCR Ligands. Angew Chem Int Ed Engl 2015; 54:13166-8. [PMID: 26361376 DOI: 10.1002/anie.201507724] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Indexed: 01/14/2023]
Affiliation(s)
- Dorothee Möller
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen (Germany)
| | - Peter Gmeiner
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Schuhstraße 19, 91052 Erlangen (Germany).
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Schneider D, Radloff S, Müller S, Möller D, Bolz M, Briese V. Analysis of Infants Based on Data from the German Perinatal Survey of the Years 1994-2011 in Mecklenburg-Pomerania, Germany. Classification of Infants with regard to their Gestation Duration and Birth Weight. Z Geburtshilfe Neonatol 2014; 219:93-8. [PMID: 25525815 DOI: 10.1055/s-0034-1383584] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND The demographic change in -Germany describes an ongoing process of population development of which the eastern German states tend to be more affected. These ongoing changes have an influence on the reproductive behavior of the population. After twenty-three years of German reunification, the present study has investigated the question to what extent the somatic classification of newborns in Mecklenburg-Pomerania (M-P), Germany, is affected. MATERIAL AND METHODS Newborn singleton births (n=174,084) were classified from the existing data of the German Perinatal Survey between 1994 and 2011. The rate of premature birth, SGA, and LGA rate as well as the rate of low birth weight ≤2,499 g were determined both gender-dependently and independently. In addition, a combined analysis of the rates has been taken into account. The obtained data material from M-P made it possible for the first time to compare by values. National and international reference studies were considered in this comparison. RESULTS In M-P, the premature birth rate is 5.2%; the rate of newborns with low birth weight ≤ 2,499 g is 4.4%. Among newborns of ≤2,499 g and SGA newborns, girls compose a higher percentage (4.7%, 12.5%) compared to boys (4.0%, 7.4%). The premature birth rate and LGA newborns appear conversely. For these, the percentage of boys (5.6%, 12.6%) is higher than that of girls (4.8%, 7.0%). 60.6% of the gender non-specific newborns ≤2,499 g are simultaneously premature newborn infants. Only a very small percentage of 0.5% of SGA newborns is at the same time premature infants and newborns with low birth weight. CONCLUSIONS By getting nationwide country-specific figures, a detailed analysis of the newborns in M-P can be performed. The analysis supports the existing national values and is a helpful addition for practice-oriented advice.
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Affiliation(s)
- D Schneider
- Department of Oral and Maxillofacial Surgery, HELIOS Hospital Schwerin, Schwerin, Germany
| | - S Radloff
- Department of Obstetrics and Gynaecology, University of Rostock, Rostock, Germany
| | - S Müller
- Department of Obstetrics and Gynaecology, University of Rostock, Rostock, Germany
| | - D Möller
- Department of Obstetrics and Gynaecology, University of Rostock, Rostock, Germany
| | - M Bolz
- Department of Obstetrics and Gynaecology, University of Rostock, Rostock, Germany
| | - V Briese
- Department of Obstetrics and Gynaecology, University of Rostock, Rostock, Germany
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Abstract
Dopamine D2 receptor-promoted activation of Gα(o) over Gα(i) may increase synaptic plasticity and thereby might improve negative symptoms of schizophrenia. Heterocyclic dopamine surrogates comprising a pyrazolo[1,5-a]pyridine moiety were synthesized and investigated for their binding properties when low- to subnanomolar K(i) values were determined for D(2L), D(2S), and D3 receptors. Measurement of [(35)S]GTPγS incorporation at D(2S) coexpressed with G-protein subunits indicated significant bias for promotion of Gα(o1) over Gα(i2) coupling for several test compounds. Functionally selective D(2S) activation was most striking for the carbaldoxime 8b (Gα(o1), pEC50 = 8.87, E(max) = 65%; Gα(i2), pEC50 = 6.63, E(max) = 27%). In contrast, the investigated 1,4-disubstituted aromatic piperazines (1,4-DAPs) behaved as antagonists for β-arrestin-2 recruitment, implying significant ligand bias for G-protein activation over β-arrestin-2 recruitment at D(2S) receptors. Ligand efficacy and selectivity between D(2S) and D3 activation were strongly influenced by regiochemistry and the nature of functional groups attached to the pyrazolo[1,5-a]pyridine moiety.
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Affiliation(s)
- Dorothee Möller
- Department of Chemistry and Pharmacy, Medicinal Chemistry, and ‡Department of Chemistry and Pharmacy, Molecular and Clinical Pharmacy, Emil Fischer Center, Friedrich Alexander University , Schuhstrasse 19, 91052 Erlangen, Germany
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Degen C, Möller D, Schlechter C. Patientenzufriedenheit bei onkologischen Erkrankungen – Eine differenzierte Betrachtung der Sektoren Hausarzt, Facharzt, Krankenhaus und Krankenkasse. Gesundheitswesen 2014; 76:204-9. [DOI: 10.1055/s-0033-1349839] [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: 10/26/2022]
Abstract
ZusammenfassungDie vorliegende Studie untersucht die Einflussgrößen für Patientenzufriedenheit bei onkologischen Patienten. Hierbei wird einerseits die Zufriedenheit mit den Hausärzten, den Fachärzten, dem Krankenhaus sowie den Krankenkassen betrachtet und andererseits die sektorübergreifende Zusammenarbeit in der gesamten onkologischen Versorgung.An der Patientenbefragung haben 12 Facharztpraxen in 8 Bundesländern teilgenommen. Insgesamt beteiligten sich 516 Patienten im Untersuchungszeitraum 2011 – 2012 an der empirischen Erhebung. Die Auswertung erfolgt mittels der multiplen Regressionsanalyse.Die Untersuchung zeigt, dass Patienten mit der sektorübergreifenden Zusammenarbeit zufriedener sind, wenn Zufriedenheit mit der Krankenkasse und der fachärztlichen Versorgung besteht. Die differenzierte Betrachtung der Zufriedenheit mit den Sektoren gibt Aufschluss darüber, dass für den haus- und fachärztlichen Bereich das Vertrauen in den Arzt als wichtigste Komponente wahrgenommen wird. Bei Krankenhäusern ist entscheidend, dass sich die Ärzte ihren Patienten gegenüber interessiert zeigen und Zeit für die Patienten nehmen. Für Krankenkassen wurde die Bereitstellung von genügend Informationen als größter Zufriedenheitstreiber identifiziert.In der Patientenwahrnehmung der Zufriedenheit mit einzelnen Sektoren spielen vor allem psychosoziale Faktoren eine wichtige Rolle. Hierunter fallen z. B. das Vertrauen in den Arzt oder das Besprechen von Ängsten des Patienten. Diese Faktoren sollten von den beteiligten Akteuren im Umgang mit den Patienten stärker fokussiert werden. Krankenkassen können hierbei als kompetenter Ansprechpartner fungieren, der den Patienten qualitätsgesicherte Informationen im Kontext der onkologischen Erkrankung bereitstellt.
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Affiliation(s)
- C. Degen
- Seminar für Allgemeine Betriebswirtschaftslehre und Management im Gesundheitswesen, Universität zu Köln
| | - D. Möller
- Seminar für Allgemeine Betriebswirtschaftslehre und Management im Gesundheitswesen, Universität zu Köln
| | - C. Schlechter
- Herstellermanagement, megapharm GmbH, Sankt Augustin
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Jantschak F, Brosda J, Franke RT, Fink H, Möller D, Hübner H, Gmeiner P, Pertz HH. Pharmacological profile of 2-bromoterguride at human dopamine D2, porcine serotonin 5-hydroxytryptamine 2A, and α2C-adrenergic receptors, and its antipsychotic-like effects in rats. J Pharmacol Exp Ther 2013; 347:57-68. [PMID: 23863695 DOI: 10.1124/jpet.113.205997] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Dopaminergic, serotonergic, and adrenergic receptors are targets for therapeutic actions in schizophrenia. Dopamine D2 receptor partial agonists such as aripiprazole represent a treatment option for patients with this severe disorder. The ineffectiveness of terguride, another D2 receptor partial agonist, in treating schizophrenia was recently attributed to its considerably high intrinsic activity at D2 receptors. In this study, we used functional assays for recombinant D2 receptors and native 5-hydroxytryptamine 2A (5-HT2A), α2C-adrenergic, and histamine H1 receptors to compare the pharmacological properties of terguride and three of its halogenated derivatives (2-chloro-, 2-bromo-, 2-iodoterguride) with those of aripiprazole. Subsequently, we studied the antidopaminergic effects of 2-bromoterguride using amphetamine-induced locomotion (AIL). Its influence on spontaneous behavior was tested in the open field. Extrapyramidal side effect (EPS) liability was evaluated by catalepsy test. In a guanosine 5'-O-(3-[(35)S]thio)triphosphate ([(35)S]GTPγS) binding assay, 2-chloro-, 2-bromo-, and 2-iodoterguride produced intrinsic activities at human D2short (hD2S) receptors that were half as high as the intrinsic activity for terguride; aripiprazole lacked agonist activity. 2-Bromoterguride and aripiprazole activated D2S receptor-mediated inhibition of cAMP accumulation to the same extent; intrinsic activity was half as high as that of terguride. All compounds tested behaved as antagonists at human D2long/Gαo (hD2L/Gαo) receptors. Compared with aripiprazole, terguride and its derivatives displayed higher affinity at porcine 5-HT2A receptors and α2C-adrenoceptors and lower affinity at H1 receptors. 2-Bromoterguride inhibited AIL and did not induce catalepsy in rats. Because of its in vitro and in vivo properties, 2-bromoterguride may be a strong candidate for the treatment of schizophrenia with a lower risk to induce EPS.
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Affiliation(s)
- F Jantschak
- Institute of Pharmacy, Free University of Berlin, Berlin, Germany (F.J., H.H.P.); Institute of Pharmacology and Toxicology, School of Veterinary Medicine, Free University of Berlin, Berlin, Germany (J.B., R.T.F., H.F.); and Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich Alexander University, Erlangen, Germany (D.M., H.H., P.G.)
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Forkert ND, Schmidt-Richberg A, Fiehler J, Illies T, Möller D, Handels H, Säring D. Automatic correction of gaps in cerebrovascular segmentations extracted from 3D time-of-flight MRA datasets. Methods Inf Med 2012; 51:415-22. [PMID: 22935785 DOI: 10.3414/me11-02-0037] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Accepted: 01/30/2012] [Indexed: 11/09/2022]
Abstract
OBJECTIVES Exact cerebrovascular segmentations are required for several applications in today's clinical routine. A major drawback of typical automatic segmentation methods is the occurrence of gaps within the segmentation. These gaps are typically located at small vessel structures exhibiting low intensities. Manual correction is very time-consuming and not suitable in clinical practice. This work presents a post-processing method for the automatic detection and closing of gaps in cerebrovascular segmentations. METHODS In this approach, the 3D centerline is calculated from an available vessel segmentation, which enables the detection of corresponding vessel endpoints. These endpoints are then used to detect possible connections to other 3D centerline voxels with a graph-based approach. After consistency check, reasonable detected paths are expanded to the vessel boundaries using a level set approach and combined with the initial segmentation. RESULTS For evaluation purposes, 100 gaps were artificially inserted at non-branching vessels and bifurcations in manual cerebrovascular segmentations derived from ten Time-of-Flight magnetic resonance angiography datasets. The results show that the presented method is capable of detecting 82% of the non-branching vessel gaps and 84% of the bifurcation gaps. The level set segmentation expands the detected connections with 0.42 mm accuracy compared to the initial segmentations. A further evaluation based on 10 real automatic segmentations from the same datasets shows that the proposed method detects 35 additional connections in average per dataset, whereas 92.7% were rated as correct by a medical expert. CONCLUSION The presented approach can considerably improve the accuracy of cerebrovascular segmentations and of following analysis outcomes.
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Affiliation(s)
- N D Forkert
- Department of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Bldg. W36, Martinistraße 52, 20246 Hamburg.
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Forkert ND, Illies T, Möller D, Handels H, Säring D, Fiehler J. Analysis of the influence of 4D MR angiography temporal resolution on time-to-peak estimation error for different cerebral vessel structures. AJNR Am J Neuroradiol 2012; 33:2103-9. [PMID: 22555588 DOI: 10.3174/ajnr.a3089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND AND PURPOSE Time-resolved MRA imaging is a promising technique for blood flow evaluation in case of cerebrovascular malformations. Unfortunately, 4D MRA imaging is a trade-off between spatial and temporal resolution. The aim of this study was to investigate the influence of temporal resolution on the error associated with TTP estimation from indicator dilution curves derived from different vascular structures. MATERIALS AND METHODS Monte Carlo simulation was performed to compute indicator dilution curves with known criterion standard TTP at temporal resolutions between 0.1 and 5 seconds. TTPs were estimated directly and by using 4 hemodynamic models for each curve and were compared with criterion standard TTP. Furthermore, clinical evaluation was performed by using 226 indicator dilution curves from different vessel structures obtained from clinical datasets. The temporal resolution was artificially decreased, and TTPs were estimated and compared with those obtained at the original temporal resolutions. The results of the clinical evaluations were further stratified for different vessel structures. RESULTS The results of both evaluations show that the TTP estimation error increases exponentially when one lowers the temporal resolution. TTP estimation by using hemodynamic model curves leads to lower estimation errors compared with direct estimation. A temporal resolution of 1.5 seconds for arteries and 2.5 seconds for venous and arteriovenous malformation vessel structures appears to be reasonable to achieve TTP estimations adequate for clinical application. CONCLUSIONS Different vessel structures require different temporal resolutions to enable comparable TTP estimation errors, which should be considered for achieving a case-optimal temporal and spatial resolution.
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Affiliation(s)
- N D Forkert
- Departments of Computational Neuroscience, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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Kapeller J, Möller D, Lasitschka F, Autschbach F, Hovius R, Rappold G, Brüss M, Gershon MD, Niesler B. Serotonin receptor diversity in the human colon: Expression of serotonin type 3 receptor subunits 5-HT3C, 5-HT3D, and 5-HT3E. J Comp Neurol 2011; 519:420-32. [PMID: 21192076 DOI: 10.1002/cne.22525] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Since the first description of 5-HT₃ receptors more than 50 years ago, there has been speculation about the molecular basis of their receptor heterogeneity. We have cloned the genes encoding novel 5-HT3 subunits 5-HT3C, 5-HT3D, and 5-HT3E and have shown that these subunits are able to form functional heteromeric receptors when coexpressed with the 5-HT3A subunit. However, whether these subunits are actually expressed in human tissue remained to be confirmed. In the current study, we performed immunocytochemistry to locate the 5-HT3A as well as the 5-HT3C, 5-HT3D, and 5-HT3E subunits within the human colon. Western blot analysis was used to confirm subunit expression, and RT-PCR was employed to detect transcripts encoding 5-HT₃ receptor subunits in microdissected tissue samples. This investigation revealed, for the first time, that 5-HT3C, 5-HT3D, and 5-HT3E subunits are coexpressed with 5-HT3A in cell bodies of myenteric neurons. Furthermore, 5-HT3A and 5-HT3D were found to be expressed in submucosal plexus of the human large intestine. These data provide a strong basis for future studies of the roles that specific 5-HT₃ receptor subtypes play in the function of the enteric and central nervous systems and the contribution that specific 5-HT₃ receptors make to the pathophysiology of gastrointestinal disorders such as irritable bowel syndrome and dyspepsia.
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Affiliation(s)
- Johannes Kapeller
- Department of Human Molecular Genetics, University of Heidelberg, Germany
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Walstab J, Hammer C, Lasitschka F, Möller D, Connolly CN, Rappold G, Brüss M, Bönisch H, Niesler B. RIC-3 exclusively enhances the surface expression of human homomeric 5-hydroxytryptamine type 3A (5-HT3A) receptors despite direct interactions with 5-HT3A, -C, -D, and -E subunits. J Biol Chem 2010; 285:26956-26965. [PMID: 20522555 PMCID: PMC2930695 DOI: 10.1074/jbc.m110.122838] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Although five 5-hydroxytryptamine type 3 (5-HT3) subunits (A-E) have been cloned, knowledge on the regulation of their assembly is limited. RIC-3 has been identified as a chaperone specific for the pentameric ligand-gated nicotinic acetylcholine and 5-HT(3) receptors. Therefore, we examined the impact of RIC-3 on differently composed 5-HT(3) receptors with the focus on 5-HT3C, -D, and -E subunits. The influence of RIC-3 on these receptor subtypes is supported by the presence of RIC3 mRNA in tissues expressing at least one of the subunits 5-HT3C, -D, and -E. Furthermore, immunocytochemical studies on transfected mammalian cells revealed co-localization in the endoplasmic reticulum and direct interaction of RIC-3 with 5-HT3A, -C, -D, and -E. Functional and pharmacological characterization was performed using HEK293 cells expressing 5-HT3A or 5-HT3A + 5-HT3B (or -C, -D, or -E) in the presence or absence of RIC-3. Ca(2+) influx analyses revealed that RIC-3 does not influence the 5-HT concentration-response relationship on 5-HT(3)A receptors but leads to differential increases of 5-HT-induced maximum response (E(max)) on cells expressing different subunits. Increases of E(max) were due to analogously enhanced B(max) values for binding of the 5-HT(3) receptor antagonist [(3)H]GR65630. The observed enhanced cell surface expression of the tested 5-HT3 subunit combinations correlated with the increased surface expression of 5-HT3A as determined by flow cytometry. In conclusion, we showed that RIC-3 can interact with 5-HT3A, -C, -D, and -E subunits and predominantly enhances the surface expression of homomeric 5-HT(3)A receptors in HEK293 cells. These data implicate a possible role of RIC-3 in determining 5-HT(3) receptor composition in vivo.
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Affiliation(s)
- Jutta Walstab
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany; Institute of Pharmacology and Toxicology, University of Bonn, Reuterstrasse 2b, 53113 Bonn, Germany
| | - Christian Hammer
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | - Felix Lasitschka
- Institute of Pathology, University of Heidelberg, Im Neuenheimer Feld 220/221, 69120 Heidelberg, Germany
| | - Dorothee Möller
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | - Christopher N Connolly
- Centre for Neuroscience, Division of Medical Sciences, Ninewells Medical School, University of Dundee, Dundee DD1 9SY, Scotland, United Kingdom
| | - Gudrun Rappold
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
| | - Michael Brüss
- Institute of Pharmacology and Toxicology, University of Bonn, Reuterstrasse 2b, 53113 Bonn, Germany
| | - Heinz Bönisch
- Institute of Pharmacology and Toxicology, University of Bonn, Reuterstrasse 2b, 53113 Bonn, Germany
| | - Beate Niesler
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany.
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Oberti S, Möller D, Neild A, Dual J, Beyeler F, Nelson BJ, Gutmann S. Strategies for single particle manipulation using acoustic and flow fields. Ultrasonics 2010; 50:247-257. [PMID: 19837446 DOI: 10.1016/j.ultras.2009.09.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2009] [Revised: 08/31/2009] [Accepted: 09/11/2009] [Indexed: 05/28/2023]
Abstract
Acoustic radiation forces have often been used for the manipulation of large amounts of micrometer sized suspended particles. The nature of acoustic standing wave fields is such that they are present throughout the whole fluidic volume; this means they are well suited to such operations, with all suspended particles reacting at the same time upon exposure. Here, this simultaneous positioning capability is exploited to pre-align particles along the centerline of channels, so that they can successively be removed by means of an external tool for further analysis. This permits a certain degree of automation in single particle manipulation processes to be achieved as initial identification of particles' location is no longer necessary, rather predetermined. Two research fields in which applications are found have been identified. First, the manipulation of copolymer beads and cells using a microgripper is presented. Then, sample preparation for crystallographic analysis by positioning crystals into a loop using acoustic manipulation and a laminar flow will be presented.
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Affiliation(s)
- S Oberti
- Institute of Mechanical Systems, Dept. of Mechanical and Process Eng., ETH Zurich, CH-8092 Zurich, Switzerland.
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Abstract
OBJECTIVES Cerebral vascular malformations might, caused by ruptures, lead to strokes. The rupture risk depends to a great extent on the individual anatomy of the vasculature. The 3D Time-of-Flight (TOF) MRA technique is one of the most commonly used non-invasive imaging techniques to obtain knowledge about the individual vascular anatomy. Unfortunately TOF images exhibit drawbacks for segmentation and direct volume visualization of the vasculature. To overcome these drawbacks an initial segmentation of the brain tissue is required. METHODS After preprocessing of the data is applied the low-intensity tissues surrounding the brain are segmented using region growing. In a following step this segmentation is used to extract supporting points at the border of the brain for a graph-based contour extraction. Finally a consistency check is performed to identify local outliers which are corrected using non-linear registration. RESULTS A quantitative validation of the method proposed was performed on 18 clinical datasets based on manual segmentations. A mean Dice coefficient of 0.989 was achieved while in average 99.56% of all vessel voxels were included by the brain segmentation. A comparison to the results yielded by three commonly used tools for brain segmentation revealed that the method described achieves better results, using TOF images as input, which are within the inter-observer variability. CONCLUSION The method suggested allows a robust and automatic segmentation of brain tissue in TOF images. It is especially helpful to improve the automatic segmentation or direct volume rendering of the cerebral vascular system.
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Affiliation(s)
- Nils Daniel Forkert
- Department of Medical Informatics, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany.
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Georgakopoulou S, Möller D, Sachs N, Herrmann H, Aebi U. Near-UV circular dichroism reveals structural transitions of vimentin subunits during intermediate filament assembly. J Mol Biol 2008; 386:544-53. [PMID: 19136013 DOI: 10.1016/j.jmb.2008.12.053] [Citation(s) in RCA: 17] [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] [Received: 08/12/2008] [Revised: 12/19/2008] [Accepted: 12/19/2008] [Indexed: 10/21/2022]
Abstract
In vitro assembly of vimentin intermediate filaments (IFs) proceeds from soluble, reconstituted tetrameric complexes to mature filaments in three distinct stages: (1) within the first seconds after initiation of assembly, tetramers laterally associate into unit-length filaments (ULFs), on average 17 nm wide; (2) for the next few minutes, ULFs grow by longitudinal annealing into short, immature filaments; (3) almost concomitant with elongation, these immature filaments begin to radially compact, yielding approximately 11-nm-wide IFs at around 15 min. The near-UV CD signal of soluble tetramers exhibits two main peaks at 285 and 278 nm, which do not change during ULF formation. In contrast, the CD signal of mature IFs exhibits two major changes: (1) the 278-nm band, denoting the transition of the tyrosines from the ground state to the first vibrational mode of the excited state, is lost; (2) a red-shifted band appears at 291 nm, indicating the emergence of a new electronic species. These changes take place independently and at different time scales. The 278-nm signal disappears within the first minute of assembly, compatible with increased rigidity of the tyrosines during elongation of the ULFs. The rise of the 291-nm band has a lifetime of approximately 13 min and denotes the generation of phenolates by deprotonation of the tyrosines' hydroxyl group after they relocalize into a negatively charged environment. The appearance of such tyrosine-binding "pockets" in the assembling filaments highlights an essential part of the molecular rearrangements characterizing the later stages of the assembly process, including the radial compaction.
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Affiliation(s)
- Sofia Georgakopoulou
- M. E. Müller Institute for Structural Biology, University of Basel, Switzerland.
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Kapeller J, Houghton LA, Mönnikes H, Walstab J, Möller D, Bönisch H, Burwinkel B, Autschbach F, Funke B, Lasitschka F, Gassler N, Fischer C, Whorwell PJ, Atkinson W, Fell C, Büchner KJ, Schmidtmann M, van der Voort I, Wisser AS, Berg T, Rappold G, Niesler B. First evidence for an association of a functional variant in the microRNA-510 target site of the serotonin receptor-type 3E gene with diarrhea predominant irritable bowel syndrome. Hum Mol Genet 2008; 17:2967-77. [PMID: 18614545 DOI: 10.1093/hmg/ddn195] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Diarrhea predominant irritable bowel syndrome (IBS-D) is a complex disorder related to dysfunctions in the serotonergic system. As cis-regulatory variants can play a role in the etiology of complex conditions, we investigated the untranslated regions (UTRs) of the serotonin receptor type 3 subunit genes HTR3A and HTR3E. Mutation analysis was carried out in a pilot sample of 200 IBS patients and 100 healthy controls from the UK. The novel HTR3E 3'-UTR variant c.*76G>A (rs62625044) was associated with female IBS-D (P = 0.033, OR = 8.53). This association was confirmed in a replication study, including 119 IBS-D patients and 195 controls from Germany (P = 0.0046, OR = 4.92). Pooled analysis resulted in a highly significant association of c.*76G>A with female IBS-D (P = 0.0002, OR = 5.39). In a reporter assay, c.*76G>A affected binding of miR-510 to the HTR3E 3'-UTR and caused elevated luciferase expression. HTR3E and miR-510 co-localize in enterocytes of the gut epithelium as shown by in situ hybridization and RT-PCR. This is the first example indicating micro RNA-related expression regulation of a serotonin receptor gene with a cis-regulatory variant affecting this regulation and appearing to be associated with female IBS-D.
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Affiliation(s)
- Johannes Kapeller
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany
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Möller D, Furche G, Slabon-Lieberz S, Gaumert G, Breitfuss A, Licht A. Blickdiagnose Sprachverständnisstörungen – Die diagnostische Güte von Experten- und Elternurteilen. Sprache Stimme Gehör 2008. [DOI: 10.1055/s-0028-1085435] [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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Niesler B, Walstab J, Combrink S, Möller D, Kapeller J, Rietdorf J, Bönisch H, Göthert M, Rappold G, Brüss M. Characterization of the novel human serotonin receptor subunits 5-HT3C,5-HT3D, and 5-HT3E. Mol Pharmacol 2007; 72:8-17. [PMID: 17392525 DOI: 10.1124/mol.106.032144] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Within the family of serotonin receptors, the 5-hydroxytryptamine-3 (5-HT(3)) receptor is the only ligand-gated ion channel. It is composed of five subunits, of which the 5-HT(3A) and 5-HT(3B) subunits are best characterized. Several studies, however, have reported on the functional diversity of native 5-HT(3) receptors, which cannot solely be explained on the basis of the 5-HT(3A) and 5-HT(3B) subunits. After our discovery of further putative 5-HT(3) serotonin receptor-encoding genes, HTR3C, HTR3D, and HTR3E, we investigated whether these novel candidates and the isoform 5-HT(3Ea) are able to form functional 5-HT(3) receptor complexes. Using immunofluorescence and immunoprecipitation studies of heterologously expressed proteins, we found that each of the respective candidates coassembles with 5-HT(3A). To investigate whether the novel subunits modulate 5-HT(3) receptor function, we performed radioligand-binding assays and calcium-influx studies in human embryonic kidney 293 cells. Our experiments revealed that the 5-HT(3C),5-HT(3D), 5-HT(3E), and 5-HT(3Ea) subunits alone cannot form functional receptors. Coexpression with 5-HT(3A), however, results in the formation of functional heteromeric complexes with different serotonin efficacies. Potencies of two agonists and antagonists were nearly identical with respect to homomeric 5-HT(3A) and heteromeric complexes. However, 5-HT showed increased efficacy with respect to 5-HT(3A/D) and 5-HT(3A/E) receptors, which is consistent with the increased surface expression compared with 5-HT(3A) receptors. In contrast, 5-HT(3A/C) and 5-HT(3A/Ea) receptors exhibited decreased 5-HT efficacy. These data show for the first time that the novel 5-HT(3) subunits are able to form heteromeric 5-HT(3) receptors, which exhibit quantitatively different functional properties compared with homomeric 5-HT(3A) receptors.
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Affiliation(s)
- Beate Niesler
- Department of Human Molecular Genetics, University of Heidelberg, Im Neuenheimer Feld 366, 69120 Heidelberg, Germany.
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Abstract
In a prospective study, we examined whether it is possible to diagnose language disorders in children in their second and third years. Twenty patients aged 17-35 months (average 26 months) were examined from August 2002 to June 2004. Language development was tested on the basis of a questionnaire for parents (ELFRA-1 or ELFRA-2) and on a detailed language assessment. After 3-8 months, the children's language was examined again by the same speech pathologist. In 12 children, in whom we had suspected a language disorder, the diagnosis was confirmed. Eight patients showed age-appropriate language development, which was confirmed in six patients at follow-up. In two cases, the follow-up revealed a language disorder. On the basis of a parent questionnaire and examination by a speech therapist, language disorders can be diagnosed in the second and third years of life. However, control assessments are necessary in order to reveal language development disturbances beginning at later ages.
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Affiliation(s)
- C Kothe
- Klinik und Poliklinik für Hals-, Nasen- und Ohrenheilkunde, Universitätsklinikum Hamburg-Eppendorf.
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Abstract
In western industrial countries, coronary heart disease is the most common cause of death. The reason is a coronary sclerosis, which by the generation of plaques narrows the inner lumen of an artery and, thus, deteriorates the blood supply. This leads to symptoms like burning pain or increased pressure in the chest, and finally to an under supply and damage of the heart muscle. In order to keep those portions of arteries that are covered by a plaque open, the stent technique was developed in the 1980s and is increasingly used since about 13 years. These stents are usually made of wires or of a slotted tube and are of two kinds: self-expanding and balloon expanding. Both types are implanted after being mounted on a catheter and expanded in the desired position. Self-expanding stents make use of the elastic deformation, while the other group of stents are expanded by a balloon, which brings about a plastic deformation of certain regions of the stent structure. Thus, after implantation, parts of these stents undergo two steps of distinct plastic deformation. First during compression, which is necessary for the mounting procedure on the catheter (crimping), and second during expansion for implantation. In this article, the residual stresses generated during crimping and expansion are presented and discussed. These stresses are stored in the structure of a portion of a stent after implantation and are superimposed on those stresses generated by the more than 700 million cyclic heart beats during the patient's life. This work is a part of several interdisciplinary research projects by the authors in order to gain reliable fail-safe criteria for the static and cyclic mechanical properties of coronary stents.
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Affiliation(s)
- D Möller
- Hahn-Meitner-Institut, Bereich Strukturforschung, Glienicker Str. 100, 14109 Berlin, Germany
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Affiliation(s)
- M. T. Pham
- Forschungszentrum Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Postfach 51 01 19, D-01314 Dresden, Germany
| | - D. Möller
- Forschungszentrum Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Postfach 51 01 19, D-01314 Dresden, Germany
| | - W. Matz
- Forschungszentrum Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Postfach 51 01 19, D-01314 Dresden, Germany
| | - A. Mücklich
- Forschungszentrum Rossendorf e.V., Institut für Ionenstrahlphysik und Materialforschung, Postfach 51 01 19, D-01314 Dresden, Germany
| | - S. Oswald
- Institut für Festkörperphysik und Werkstofforschung, Postfach 01171, Helmholtzstrasse 20, D-01069 Dresden, Germany
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Lotfi A, Vrabec J, Möller D, Mecke M, Fischer J. Molekulardynamische Simulationen in der Thermo- und Fluiddynamik. CHEM-ING-TECH 1997. [DOI: 10.1002/cite.3306909107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kronholz HL, Möller D, Willich N, Sibrowski W. Erfahrungen mit einer Anlage zur Bestrahlung von Blutprodukten. BIOMED ENG-BIOMED TE 1993. [DOI: 10.1515/bmte.1993.38.s1.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Möller D. Pharmacokinetic system: computer-aided dosing regimens with a new software package. Int J Clin Pharmacol Ther Toxicol 1992; 30:501-2. [PMID: 1490806] [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] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- D Möller
- Abbott GmbH Diagnostika, Wiesbaden, Germany
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Möller D, Kronholz HL, Schütz J. [Quality assurance in x-ray installations for therapy in accordance with the x-ray regulations]. Strahlenther Onkol 1991; 167:412-5. [PMID: 1858018] [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: 12/29/2022]
Abstract
For the conventional X-ray therapy the Röntgenverordnung demands the examination of the dose rate in the radiation beam. The measurements and the results are demonstrated. Over a long period the X-ray equipment shows a constant dose rate. Controls of the technical devices and situations of danger are explained.
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Affiliation(s)
- D Möller
- Zentrum für Strahlenmedizin, Westfälische Wilhelms-Universität Münster
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Pioch T, Möller D, Staehle HJ, Hoppe W. [Solubility of enamel and synthetic hydroxylapatite on irradiation]. Dtsch Zahnarztl Z 1991; 46:413-5. [PMID: 1817062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The effect of Co 60-irradiation (70 Gy) on pulverized human enamel and synthetic hydroxyapatite was studied in vitro. Irradiated and non-irradiated samples were experimentally demineralized (pH 5.1) during a period of 28 days. In terms of solubility, defined as the equilibrium of saturation, there was no statistically significant difference between irradiated and non-irradiated enamel. However, in terms of solubility rates, defined as the amount of dissolved substance during the demineralization period, irradiated enamel showed a statistically significantly higher solubility rate than non-irradiated enamel. There was no effect of Co 60-irradiation on synthetic hydroxyapatite.
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Affiliation(s)
- T Pioch
- Poliklinik für Zahnerhaltungskunde, MZK-Klinik der Universität Heidelberg
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Aarts J, Möller D, van Wijk van Brievingh R. Modeling and simulation in biomedicine. Proc Annu Symp Comput Appl Med Care 1991:900-2. [PMID: 1807745 PMCID: PMC2247669 DOI: 10.1109/iembs.1990.691739] [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] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A group of researchers and educators in The Netherlands, Germany and Czechoslovakia have developed and adapted mathematical computer models of phenomena in the field of physiology and biomedicine for use in higher education. The models are graphical and highly interactive, and are all written in TurboPascal or the mathematical simulation language PSI. An educational shell has been developed to launch the models. The shell allows students to interact with the models and teachers to edit the models, to add new models and to monitor the achievements of the students. The models and the shell have been implemented on a MS-DOS personal computer. This paper describes the features of the modeling package and presents the modeling and simulation of the heart muscle as an example.
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Affiliation(s)
- J Aarts
- Dept. of Medical Informatics, Hogeschool Midden Nederland, Leusden, The Netherlands
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Avanzolini G, Barbini P, Cappello A, Cevenini G, Möller D, Pohl V, Sikora T. Electrical analogs for monitoring vascular properties in artificial heart studies. IEEE Trans Biomed Eng 1989; 36:462-70. [PMID: 2714826 DOI: 10.1109/10.18753] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The problem of choosing parametric descriptions of the systemic vascular bed suitable for monitoring beat-to-beat changes in peripheral vascular properties is considered. Three simple models with two, three, and five elements are compared, essentially exploiting the Akaike information criterion combined with reasonable requirements for estimate accuracy. Analysis of pressure data, which are either simulated by the five-element model or measured on a mock circulatory system during abrupt changes in peripheral resistance, suggests guidelines for model selection. In particular, the five-element model exhibits very close adherence to physical reality by allowing for reflection, while the classical windkessel model provides the most reproducible estimates.
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Wendt K, Möller D, Ritter B. Geodetic measurements of surface deformations during the present rifting episode in NE Iceland. ACTA ACUST UNITED AC 1985. [DOI: 10.1029/jb090ib12p10163] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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