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Versini R, Sritharan S, Aykac Fas B, Tubiana T, Aimeur SZ, Henri J, Erard M, Nüsse O, Andreani J, Baaden M, Fuchs P, Galochkina T, Chatzigoulas A, Cournia Z, Santuz H, Sacquin-Mora S, Taly A. A Perspective on the Prospective Use of AI in Protein Structure Prediction. J Chem Inf Model 2024; 64:26-41. [PMID: 38124369 DOI: 10.1021/acs.jcim.3c01361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
AlphaFold2 (AF2) and RoseTTaFold (RF) have revolutionized structural biology, serving as highly reliable and effective methods for predicting protein structures. This article explores their impact and limitations, focusing on their integration into experimental pipelines and their application in diverse protein classes, including membrane proteins, intrinsically disordered proteins (IDPs), and oligomers. In experimental pipelines, AF2 models help X-ray crystallography in resolving the phase problem, while complementarity with mass spectrometry and NMR data enhances structure determination and protein flexibility prediction. Predicting the structure of membrane proteins remains challenging for both AF2 and RF due to difficulties in capturing conformational ensembles and interactions with the membrane. Improvements in incorporating membrane-specific features and predicting the structural effect of mutations are crucial. For intrinsically disordered proteins, AF2's confidence score (pLDDT) serves as a competitive disorder predictor, but integrative approaches including molecular dynamics (MD) simulations or hydrophobic cluster analyses are advocated for accurate dynamics representation. AF2 and RF show promising results for oligomeric models, outperforming traditional docking methods, with AlphaFold-Multimer showing improved performance. However, some caveats remain in particular for membrane proteins. Real-life examples demonstrate AF2's predictive capabilities in unknown protein structures, but models should be evaluated for their agreement with experimental data. Furthermore, AF2 models can be used complementarily with MD simulations. In this Perspective, we propose a "wish list" for improving deep-learning-based protein folding prediction models, including using experimental data as constraints and modifying models with binding partners or post-translational modifications. Additionally, a meta-tool for ranking and suggesting composite models is suggested, driving future advancements in this rapidly evolving field.
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Affiliation(s)
- Raphaelle Versini
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Sujith Sritharan
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Burcu Aykac Fas
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Thibault Tubiana
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Sana Zineb Aimeur
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, 91405 Orsay, France
| | - Julien Henri
- Sorbonne Université, CNRS, Laboratoire de Biologie, Computationnelle et Quantitative UMR 7238, Institut de Biologie Paris-Seine, 4 Place Jussieu, F-75005 Paris, France
| | - Marie Erard
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, 91405 Orsay, France
| | - Oliver Nüsse
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, 91405 Orsay, France
| | - Jessica Andreani
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Marc Baaden
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Patrick Fuchs
- Sorbonne Université, École Normale Supérieure, PSL University, CNRS, Laboratoire des Biomolécules, LBM, 75005 Paris, France
- Université de Paris, UFR Sciences du Vivant, 75013 Paris, France
| | - Tatiana Galochkina
- Université Paris Cité and Université des Antilles and Université de la Réunion, INSERM, BIGR, F-75014 Paris, France
| | - Alexios Chatzigoulas
- Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece
- Department of Informatics and Telecommunications, National and Kapodistrian University of Athens, 15784 Athens, Greece
| | - Zoe Cournia
- Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece
- Department of Informatics and Telecommunications, National and Kapodistrian University of Athens, 15784 Athens, Greece
| | - Hubert Santuz
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Sophie Sacquin-Mora
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
| | - Antoine Taly
- Laboratoire de Biochimie Théorique, CNRS (UPR9080), Université Paris Cité, F-75005 Paris, France
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Knoll K, Fuchs P, Weidmann I, Altunkas F, Voss S, Lennerz C, Kolb C, Kessler T, Schunkert H, Reinhard W, Groß S, Trenkwalder T. Incidence and Predictors of Ventricular Arrhythmias in Transthyretin Amyloid Cardiomyopathy. J Clin Med 2023; 12:4624. [PMID: 37510739 PMCID: PMC10380522 DOI: 10.3390/jcm12144624] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 06/29/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023] Open
Abstract
BACKGROUND Wild-type transthyretin amyloid cardiomyopathy (wtATTR-CM) is characterized by heart failure, conduction abnormalities and arrhythmias. The incidence of ventricular arrhythmias, particularly ventricular tachycardias (VTs), in wtATTR-CM is unclear. With the development of targeted therapies and improved overall prognosis, there is an unmet need to identify patients at high risk for VTs who might benefit from ICD therapy. METHODS Between 2017 and 2022, 72 patients diagnosed with wtATTR-CM were prospectively evaluated for the presence of ventricular arrhythmias using a Holter ECG. VTs were defined as >3 consecutive beats with a heart rate > 100 beats per minute originating from a ventricle. RESULTS The incidence of VTs was 44% (n = 32/72) in unselected wtATTR-CM patients. Patients with VT showed significantly more severe left ventricular (LV) hypertrophy (septum diameter 21 ± 2.6 vs. 19 ± 3.0 mm, p = 0.006), reduced LV ejection fraction (47 ± 8 vs. 52 ± 8%, p = 0.014) and larger left atria (32 ± 7 vs. 28 ± 6 mm2, p = 0.020), but no differences in cardiac markers such as NTproBNP and troponin. In a multivariable model, LV hypertrophy (LV mass indexed, OR = 1.02 [1.00-1.03], p = 0.031), LV end-diastolic diameter (OR = 0.85 [0.74-0.98], p = 0.021) and LV end-systolic diameter (OR = 1.19 [1.03-1.349], p = 0.092) were predictive for VT occurrence with an area under the receiver operating characteristic of 0.76 [0.65-0.87]. CONCLUSIONS The incidence of ventricular arrhythmia in wtATTR-CM is high and is associated with an advanced stage of left ventricular disease. Further studies are needed evaluating the role of VTs in predicting sudden cardiac death and the benefit of ICD therapy in wtATTR-CM.
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Affiliation(s)
- Katharina Knoll
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
| | - Patrick Fuchs
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
| | - Isabel Weidmann
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
| | - Fatih Altunkas
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
| | - Stephanie Voss
- German Heart Centre Munich, Department of Cardiovascular Surgery, Technical University of Munich, 80636 Munich, Germany
| | - Carsten Lennerz
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
| | - Christof Kolb
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
| | - Thorsten Kessler
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
| | - Heribert Schunkert
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
| | - Wibke Reinhard
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
| | - Stefan Groß
- DZHK (German Centre for Cardiovascular Research), Partner Site Greifswald, 17475 Greifswald, Germany
- Department of Internal Medicine B, University Medicine Greifswald, 17475 Greifswald, Germany
| | - Teresa Trenkwalder
- German Heart Centre Munich, Department of Cardiology, Technical University of Munich, 80333 Munich, Germany
- DZHK (German Centre for Cardiovascular Research), Partner Site Munich Heart Alliance, 80336 Munich, Germany
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Knoll K, Fuchs P, Trenkwalder T. Kardiale Amyloidose. CV 2023. [PMCID: PMC10063327 DOI: 10.1007/s15027-023-2968-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
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Fuchs P, Shmueli K. Incomplete spectrum QSM using support information. Front Neurosci 2023; 17:1130524. [PMID: 37139523 PMCID: PMC10149841 DOI: 10.3389/fnins.2023.1130524] [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] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 03/28/2023] [Indexed: 05/05/2023] Open
Abstract
Introduction Reconstructing a bounded object from incomplete k-space data is a well posed problem, and it was recently shown that this incomplete spectrum approach can be used to reconstruct undersampled MRI images with similar quality to compressed sensing approaches. Here, we apply this incomplete spectrum approach to the field-to-source inverse problem encountered in quantitative magnetic susceptibility mapping (QSM). The field-to-source problem is an ill-posed problem because of conical regions in frequency space where the dipole kernel is zero or very small, which leads to the kernel's inverse being ill-defined. These "ill-posed" regions typically lead to streaking artifacts in QSM reconstructions. In contrast to compressed sensing, our approach relies on knowledge of the image-space support, more commonly referred to as the mask, of our object as well as the region in k-space with ill-defined values. In the QSM case, this mask is usually available, as it is required for most QSM background field removal and reconstruction methods. Methods We tuned the incomplete spectrum method (mask and band-limit) for QSM on a simulated dataset from the most recent QSM challenge and validated the QSM reconstruction results on brain images acquired in five healthy volunteers, comparing incomplete spectrum QSM to current state-of-the art-methods: FANSI, nonlinear dipole inversion, and conventional thresholded k-space division. Results Without additional regularization, incomplete spectrum QSM performs slightly better than direct QSM reconstruction methods such as thresholded k-space division (PSNR of 39.9 vs. 39.4 of TKD on a simulated dataset) and provides susceptibility values in key iron-rich regions similar or slightly lower than state-of-the-art algorithms, but did not improve the PSNR in comparison to FANSI or nonlinear dipole inversion. With added (ℓ1-wavelet based) regularization the new approach produces results similar to compressed sensing based reconstructions (at sufficiently high levels of regularization). Discussion Incomplete spectrum QSM provides a new approach to handle the "ill-posed" regions in the frequency-space data input to QSM.
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Rogers S, Gui L, Kovalenko A, Zoni V, Carpentier M, Ramji K, Ben Mbarek K, Bacle A, Fuchs P, Campomanes P, Reetz E, Speer NO, Reynolds E, Thiam AR, Vanni S, Nicastro D, Henne WM. Triglyceride lipolysis triggers liquid crystalline phases in lipid droplets and alters the LD proteome. J Cell Biol 2022; 221:213472. [PMID: 36112368 PMCID: PMC9485706 DOI: 10.1083/jcb.202205053] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 08/10/2022] [Accepted: 08/22/2022] [Indexed: 01/08/2023] Open
Abstract
Lipid droplets (LDs) are reservoirs for triglycerides (TGs) and sterol-esters (SEs), but how these lipids are organized within LDs and influence their proteome remain unclear. Using in situ cryo-electron tomography, we show that glucose restriction triggers lipid phase transitions within LDs generating liquid crystalline lattices inside them. Mechanistically this requires TG lipolysis, which decreases the LD's TG:SE ratio, promoting SE transition to a liquid crystalline phase. Molecular dynamics simulations reveal TG depletion promotes spontaneous TG and SE demixing in LDs, additionally altering the lipid packing of the PL monolayer surface. Fluorescence imaging and proteomics further reveal that liquid crystalline phases are associated with selective remodeling of the LD proteome. Some canonical LD proteins, including Erg6, relocalize to the ER network, whereas others remain LD-associated. Model peptide LiveDrop also redistributes from LDs to the ER, suggesting liquid crystalline phases influence ER-LD interorganelle transport. Our data suggests glucose restriction drives TG mobilization, which alters the phase properties of LD lipids and selectively remodels the LD proteome.
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Affiliation(s)
- Sean Rogers
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Long Gui
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Anastasiia Kovalenko
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Valeria Zoni
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Maxime Carpentier
- Laboratoire de Physique de l'École Normale Supérieure, École normale supérieure, Université Paris Sciences et Lettres, Centre national de la recherche scientifique, Sorbonne Université, Université de Paris, Paris, France
| | - Kamran Ramji
- Laboratoire de Physique de l'École Normale Supérieure, École normale supérieure, Université Paris Sciences et Lettres, Centre national de la recherche scientifique, Sorbonne Université, Université de Paris, Paris, France
| | - Kalthoum Ben Mbarek
- Laboratoire de Physique de l'École Normale Supérieure, École normale supérieure, Université Paris Sciences et Lettres, Centre national de la recherche scientifique, Sorbonne Université, Université de Paris, Paris, France
| | - Amelie Bacle
- Institute Jacques Monod, Centre national de la recherche scientifique, University of Paris, Paris, France
| | - Patrick Fuchs
- Laboratoire des Biomolécules, Paris, France.,Université de Paris, UFR Sciences du Vivant, Paris, France
| | - Pablo Campomanes
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Evan Reetz
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Natalie Ortiz Speer
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Emma Reynolds
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Abdou Rachid Thiam
- Laboratoire de Physique de l'École Normale Supérieure, École normale supérieure, Université Paris Sciences et Lettres, Centre national de la recherche scientifique, Sorbonne Université, Université de Paris, Paris, France
| | - Stefano Vanni
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Daniela Nicastro
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - W Mike Henne
- Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
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Fuchs PX, Fuchs P, von Duvillard SP, Wagner H, Shiang TY. Critical assessment of a wide-spread method for estimating energy expenditure during accelerated running based on positioning tracking systems. J Sport Health Sci 2022; 11:641-643. [PMID: 35263686 PMCID: PMC9729919 DOI: 10.1016/j.jshs.2022.03.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/23/2022] [Accepted: 02/18/2022] [Indexed: 06/10/2023]
Affiliation(s)
- Philip X Fuchs
- Department of Athletic Performance, (National) Taiwan Normal University, Taipei 11677, China; Department of Sport and Exercise Science, University of Salzburg, Salzburg 5400, Austria
| | - Patrick Fuchs
- Department of Sport and Exercise Science, University of Salzburg, Salzburg 5400, Austria
| | - Serge P von Duvillard
- Department of Sport and Exercise Science, University of Salzburg, Salzburg 5400, Austria
| | - Herbert Wagner
- Department of Sport and Exercise Science, University of Salzburg, Salzburg 5400, Austria
| | - Tzyy-Yuang Shiang
- Department of Athletic Performance, (National) Taiwan Normal University, Taipei 11677, China.
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Fuchs P, Coulibaly L, Reiter GS, Schmidt-Erfurth U. [Artificial intelligence in the management of anti-VEGF treatment: the Vienna fluid monitor in clinical practice]. Ophthalmologe 2022; 119:520-524. [PMID: 35420354 PMCID: PMC9076706 DOI: 10.1007/s00347-022-01618-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 12/13/2022]
Abstract
Der Vienna Fluid Monitor ist ein künstlicher Intelligenz(KI)-Algorithmus zur präzisen Lokalisation und Quantifizierung von retinaler Flüssigkeit. Der Algorithmus soll Klinikern und Klinikerinnen helfen, objektive und genaue Behandlungsentscheidungen bei der antivaskulären endothelialen Wachstumsfaktor(Anti-VEGF)-Therapie von Patienten mit neovaskulärer altersbedingter Makuladegeneration zu treffen. Ziel der Implementierung ist die Optimierung der Patientensicherheit, die Erhaltung der Sehleistung und gleichzeitig die Behandlungslast für das Gesundheitssystem und die Patienten zu verringern.
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Affiliation(s)
- P Fuchs
- Vienna Clinical Trial Center (VTC), Universitätsklinik für Augenheilkunde und Optometrie, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090, Wien, Österreich
| | - L Coulibaly
- Vienna Clinical Trial Center (VTC), Universitätsklinik für Augenheilkunde und Optometrie, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090, Wien, Österreich
| | - G S Reiter
- Christian Doppler Laboratory for Ophthalmic Image Analysis, Universitätsklinik für Augenheilkunde und Optometrie, Medizinische Universität Wien, Wien, Österreich
| | - U Schmidt-Erfurth
- Vienna Clinical Trial Center (VTC), Universitätsklinik für Augenheilkunde und Optometrie, Medizinische Universität Wien, Währinger Gürtel 18-20, 1090, Wien, Österreich. .,Christian Doppler Laboratory for Ophthalmic Image Analysis, Universitätsklinik für Augenheilkunde und Optometrie, Medizinische Universität Wien, Wien, Österreich.
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Aguilar M, Bassereau P, Bastos M, Beales P, Bechinger B, Bonev B, Brand I, Chalouhi E, Clarke RJ, Deplazes E, Fraternali F, Fuchs P, Hoogenboom B, Lund R, Mahmoudi N, Milán Rodríguez P, O'Shea P, Pabst G, Pal S, Rice A, Sanderson J, Seddon J, Sengupta D, Siegel DP, Srivastava A, Utterström J, Vácha R, van 't Hag L, Vijayakumar A, Zoranić L. Peptide-membrane interactions and biotechnology; enabling next-generation synthetic biology: general discussion. Faraday Discuss 2021; 232:463-481. [PMID: 34909808 DOI: 10.1039/d1fd90068d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Aguilar MI, Al Nahas K, Barrera FN, Bassereau P, Bechinger B, Brand I, Chattopadhyay A, Clarke RJ, DeGrado WF, Deplazes E, Fletcher M, Fraternali F, Fuchs P, Garcia-Saez AJ, Gilbert R, Hoogenboom BW, Jarin Z, O'Shea P, Pabst G, Pal S, Sanderson JM, Seddon JM, Sengupta D, Siegel DP, Srivastava A, Tieleman DP, Tripathy M, Utterström J, Vácha R, Vanni S, Voth GA. Theoretical and experimental comparisons of simple peptide-membrane systems; towards defining the reaction space: general discussion. Faraday Discuss 2021; 232:149-171. [PMID: 34908093 DOI: 10.1039/d1fd90065j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Aguilar M, Al Nahas K, Barrera F, Bassereau P, Bastos M, Beales P, Bechinger B, Bonev B, Brand I, Chattopadhyay A, DeGrado W, Fuchs P, Garcia Saez AJ, Hoogenboom B, Kapoor S, Milán Rodríguez P, Molloy J, O'Shea P, Pabst G, Pal S, Rice A, Roux A, Sanderson J, Seddon J, Tamm LK, Vijayakumar A. Behaviour and interactions of proteins and peptides with and within membranes; from simple models to cellular membranes: general discussion. Faraday Discuss 2021; 232:375-398. [PMID: 34909817 DOI: 10.1039/d1fd90067f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Adrien V, Rayan G, Astafyeva K, Broutin I, Picard M, Fuchs P, Urbach W, Taulier N. How to best estimate the viscosity of lipid bilayers. Biophys Chem 2021; 281:106732. [PMID: 34844029 DOI: 10.1016/j.bpc.2021.106732] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/19/2021] [Accepted: 11/19/2021] [Indexed: 11/02/2022]
Abstract
The viscosity of lipid bilayers is a property relevant to biological function, as it affects the diffusion of membrane macromolecules. To determine its value, and hence portray the membrane, various literature-reported techniques lead to significantly different results. Herein we compare the results issuing from two widely used techniques to determine the viscosity of membranes: the Fluorescence Lifetime Imaging Microscopy (FLIM), and Fluorescence Recovery After Photobleaching (FRAP). FLIM relates the time of rotation of a molecular rotor inserted into the membrane to the macroscopic viscosity of a fluid. Whereas FRAP measures molecular diffusion coefficients. This approach is based on a hydrodynamic model connecting the mobility of a membrane inclusion to the viscosity of the membrane. We show that: This article emphasizes the pitfalls to be avoided and the rules to be observed in order to obtain a value of the bilayer viscosity that characterizes the bilayer instead of interactions between the bilayer and the embedded probe.
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Affiliation(s)
- Vladimir Adrien
- Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France; Université de Paris, CNRS, Laboratoire CiTCoM, 75006 Paris, France; Sorbonne Université, AP-HP Department of Psychiatry, Hôpital Saint-Antoine, Paris, France
| | - Gamal Rayan
- Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France.
| | - Ksenia Astafyeva
- Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
| | - Isabelle Broutin
- Université de Paris, CNRS, Laboratoire CiTCoM, 75006 Paris, France
| | - Martin Picard
- Université de Paris, Laboratoire de Biologie Physico-Chimique des Protéines Membranaires, CNRS UMR 7099, F-75005 Paris, France; Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild pour le développement de la recherche Scientifique, F-75005 Paris, France
| | - Patrick Fuchs
- Sorbonne Université, Ecole Normale Supérieure, PSL University, CNRS, Laboratoire des Biomolécules (LBM), 75005 Paris, France; Université de Paris, UFR Sciences du Vivant, 75013 Paris, France
| | - Wladimir Urbach
- Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France; Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, LIB, F-75006 Paris, France
| | - Nicolas Taulier
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, LIB, F-75006 Paris, France
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Wagner H, Fuchs P, Michalsik LB. On‐court game‐based testing in world‐class, top‐elite, and elite adult female team handball players. Transl Sports Med 2020. [DOI: 10.1002/tsm2.139] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Herbert Wagner
- Department of Sport and Exercise Science University of Salzburg Salzburg Austria
| | - Patrick Fuchs
- Department of Sport and Exercise Science University of Salzburg Salzburg Austria
| | - Lars Bojsen Michalsik
- Department of Sport Sciences and Clinical Biomechanics University of Southern Denmark Odense Denmark
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Fuchs P, Czech I, Fuchs A, Sikora J. Use of neutral argon plasma in the treatment of endometriosis initial findings. CLIN EXP OBSTET GYN 2019. [DOI: 10.12891/ceog4689.2019] [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: 11/01/2022]
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Aurich M, Niemers M, Fuchs P, Greiner S, Müller-Hennessen M, Uhlmann L, Giannitsis E, Ehlermann P, Meder B, Katus HA, Mereles D. Pathophysiological background and prognostic implication of systolic aortic root motion in non-ischemic dilated cardiomyopathy. Sci Rep 2019; 9:3866. [PMID: 30846742 PMCID: PMC6405754 DOI: 10.1038/s41598-019-40386-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 02/13/2019] [Indexed: 01/08/2023] Open
Abstract
Recordings of aortic root movement represent one of the first accomplishments of ultrasound in medicine and mark the beginning of functional cardiac imaging. However, the underlying mechanism is not completely understood. Since the aortic root is directly connected to the cardiac skeleton we hypothesize, that the amplitude of systolic aortic root motion (SARM) may be mainly caused by displacement of the cardiac base towards the apex and might therefore be used as measure of left ventricular longitudinal function (LV-LF). One hundred and eighty patients with dilated cardiomyopathy and 180 healthy controls were prospectively included into this study. SARM was lower in patients compared to controls (9 ± 3 mm vs. 12 ± 2 mm, p < 0.001) and lowest in patients with cardiovascular events (9 ± 3 mm vs. 7 ± 3 mm, p < 0.001). During a median follow-up time of 38 months, the combined end-point of cardiovascular death or hospitalization for heart failure was reached by 25 patients (13.9%). Reduced SARM had significant prognostic impact on outcome (hazard ratio 0.74, 95% confidence interval 0.63–0.88, p < 0.001) and remained an independent predictor in the multivariate analysis. Compared to parameters with potential influence on its mechanism, SARM correlated best (r = 0.75, p < 0.001) with global longitudinal strain (GLS). SARM may therefore represent an alternative echocardiographic parameter for the assessment of LV-LF, particularly when GLS is not feasible or apical views are not available.
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Affiliation(s)
- Matthias Aurich
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany.
| | - Matthias Niemers
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Patrick Fuchs
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Sebastian Greiner
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Matthias Müller-Hennessen
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Lorenz Uhlmann
- Institute of Medical Biometry and Informatics, University of Heidelberg, Heidelberg, Germany
| | - Evangelos Giannitsis
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Philipp Ehlermann
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Benjamin Meder
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Hugo A Katus
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
| | - Derliz Mereles
- Department of Internal Medicine III, Cardiology, Angiology and Pneumology, University of Heidelberg, Heidelberg, Germany
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16
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Wagner H, Fuchs P, Fusco A, Fuchs P, Bell JW, von Duvillard SP. Physical Performance in Elite Male and Female Team-Handball Players. Int J Sports Physiol Perform 2019; 14:60-67. [PMID: 29893597 DOI: 10.1123/ijspp.2018-0014] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 04/30/2018] [Accepted: 05/27/2018] [Indexed: 11/18/2022]
Abstract
PURPOSE Biological differences between men and women are well known; however, literature addressing knowledge about the influence of sex on specific and general performance in team handball is almost nonexistent. Consequently, the aim of the study was to assess and compare specific and general physical performance in male and female elite team-handball players, to determine if the differences are consequential for general compared with specific physical performance characteristics and the relationship between general and specific physical performance. METHODS Twelve male and 10 female elite team-handball players performed a game-based performance test, upper- and lower-body strength and power tests, a sprinting test, and an incremental treadmill running test. RESULTS Significant differences (P < .05) between male and female players were found for peak oxygen uptake and total running time during the treadmill test, 30-m sprinting time, leg-extension strength, trunk- and shoulder-rotation torque, and countermovement-jump height, as well as offense and defense time, ball velocity, and jump height in the game-based performance test. An interaction (sex × test) was found for time and oxygen uptake, and except shoulder-rotation torque and ball velocity in women, the authors found only a low relationship between specific and general physical performance. CONCLUSION The results of the study revealed that male players are heavier, taller, faster, and stronger; jump higher; and have better aerobic performance. However, female players performed relatively better in the team-handball-specific tests than in the general tests. The findings also suggest that female players should focus more on strength training.
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17
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Aurich M, Fuchs P, Müller-Hennessen M, Uhlmann L, Niemers M, Greiner S, Täger T, Hirschberg K, Ehlermann P, Meder B, Frankenstein L, Giannitsis E, Katus HA, Mereles D. Unidimensional Longitudinal Strain: A Simple Approach for the Assessment of Longitudinal Myocardial Deformation by Echocardiography. J Am Soc Echocardiogr 2018; 31:733-742. [DOI: 10.1016/j.echo.2017.12.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Indexed: 12/20/2022]
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18
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Daste F, Sauvanet C, Bavdek A, Baye J, Pierre F, Le Borgne R, David C, Rojo M, Fuchs P, Tareste D. The heptad repeat domain 1 of Mitofusin has membrane destabilization function in mitochondrial fusion. EMBO Rep 2018; 19:embr.201643637. [PMID: 29661855 DOI: 10.15252/embr.201643637] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 03/07/2018] [Accepted: 03/16/2018] [Indexed: 12/31/2022] Open
Abstract
Mitochondria are double-membrane-bound organelles that constantly change shape through membrane fusion and fission. Outer mitochondrial membrane fusion is controlled by Mitofusin, whose molecular architecture consists of an N-terminal GTPase domain, a first heptad repeat domain (HR1), two transmembrane domains, and a second heptad repeat domain (HR2). The mode of action of Mitofusin and the specific roles played by each of these functional domains in mitochondrial fusion are not fully understood. Here, using a combination of in situ and in vitro fusion assays, we show that HR1 induces membrane fusion and possesses a conserved amphipathic helix that folds upon interaction with the lipid bilayer surface. Our results strongly suggest that HR1 facilitates membrane fusion by destabilizing the lipid bilayer structure, notably in membrane regions presenting lipid packing defects. This mechanism for fusion is thus distinct from that described for the heptad repeat domains of SNARE and viral proteins, which assemble as membrane-bridging complexes, triggering close membrane apposition and fusion, and is more closely related to that of the C-terminal amphipathic tail of the Atlastin protein.
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Affiliation(s)
- Frédéric Daste
- Membrane Traffic in Health & Disease, INSERM ERL U950, Sorbonne Paris Cité, Université Paris Descartes, Paris, France.,Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
| | - Cécile Sauvanet
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR 5095, Université de Bordeaux, Bordeaux, France
| | - Andrej Bavdek
- Membrane Traffic in Health & Disease, INSERM ERL U950, Sorbonne Paris Cité, Université Paris Descartes, Paris, France.,Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
| | - James Baye
- Membrane Traffic in Health & Disease, INSERM ERL U950, Sorbonne Paris Cité, Université Paris Descartes, Paris, France.,Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
| | - Fabienne Pierre
- Membrane Traffic in Health & Disease, INSERM ERL U950, Sorbonne Paris Cité, Université Paris Descartes, Paris, France.,Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France.,Centre de Psychiatrie et Neurosciences, INSERM UMR 894, Sorbonne Paris Cité, Université Paris Descartes, Paris, France
| | - Rémi Le Borgne
- Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
| | - Claudine David
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR 5095, Université de Bordeaux, Bordeaux, France
| | - Manuel Rojo
- Institut de Biochimie et Génétique Cellulaires, CNRS UMR 5095, Université de Bordeaux, Bordeaux, France
| | - Patrick Fuchs
- Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France
| | - David Tareste
- Membrane Traffic in Health & Disease, INSERM ERL U950, Sorbonne Paris Cité, Université Paris Descartes, Paris, France .,Institut Jacques Monod, CNRS UMR 7592, Sorbonne Paris Cité, Université Paris Diderot, Paris, France.,Centre de Psychiatrie et Neurosciences, INSERM UMR 894, Sorbonne Paris Cité, Université Paris Descartes, Paris, France
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19
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Abdollahi N, Albani A, Anthony E, Baud A, Cardon M, Clerc R, Czernecki D, Conte R, David L, Delaune A, Djerroud S, Fourgoux P, Guiglielmoni N, Laurentie J, Lehmann N, Lochard C, Montagne R, Myrodia V, Opuu V, Parey E, Polit L, Privé S, Quignot C, Ruiz-Cuevas M, Sissoko M, Sompairac N, Vallerix A, Verrecchia V, Delarue M, Guérois R, Ponty Y, Sacquin-Mora S, Carbone A, Froidevaux C, Le Crom S, Lespinet O, Weigt M, Abboud S, Bernardes J, Bouvier G, Dequeker C, Ferré A, Fuchs P, Lelandais G, Poulain P, Richard H, Schweke H, Laine E, Lopes A. Meet-U: Educating through research immersion. PLoS Comput Biol 2018; 14:e1005992. [PMID: 29543809 PMCID: PMC5854232 DOI: 10.1371/journal.pcbi.1005992] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We present a new educational initiative called Meet-U that aims to train students for collaborative work in computational biology and to bridge the gap between education and research. Meet-U mimics the setup of collaborative research projects and takes advantage of the most popular tools for collaborative work and of cloud computing. Students are grouped in teams of 4–5 people and have to realize a project from A to Z that answers a challenging question in biology. Meet-U promotes "coopetition," as the students collaborate within and across the teams and are also in competition with each other to develop the best final product. Meet-U fosters interactions between different actors of education and research through the organization of a meeting day, open to everyone, where the students present their work to a jury of researchers and jury members give research seminars. This very unique combination of education and research is strongly motivating for the students and provides a formidable opportunity for a scientific community to unite and increase its visibility. We report on our experience with Meet-U in two French universities with master’s students in bioinformatics and modeling, with protein–protein docking as the subject of the course. Meet-U is easy to implement and can be straightforwardly transferred to other fields and/or universities. All the information and data are available at www.meet-u.org.
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Affiliation(s)
- Nika Abdollahi
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Alexandre Albani
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Eric Anthony
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Agnes Baud
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Mélissa Cardon
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Robert Clerc
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Dariusz Czernecki
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Romain Conte
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Laurent David
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Agathe Delaune
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Samia Djerroud
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Pauline Fourgoux
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Nadège Guiglielmoni
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Jeanne Laurentie
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Nathalie Lehmann
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Camille Lochard
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Rémi Montagne
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Vasiliki Myrodia
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Vaitea Opuu
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Elise Parey
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Lélia Polit
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Sylvain Privé
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Chloé Quignot
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Maria Ruiz-Cuevas
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Mariam Sissoko
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Nicolas Sompairac
- Departments of Computer Science and of Life Sciences, Sorbonne Université (SU) / UPMC, Paris, France
| | - Audrey Vallerix
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Violaine Verrecchia
- Department of Biology and of Computer Science, Univ. Paris-Sud, Université Paris-Saclay (UPSay), Orsay, France
| | - Marc Delarue
- Unit of Structural Dynamics of Macromolecules, CNRS, Institut Pasteur, Paris, France
| | - Raphael Guérois
- Institute for Integrative Biology of the Cell (I2BC), IBITECS, CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
| | - Yann Ponty
- AMIBio team, Laboratoire d’informatique de l’École polytechnique (LIX, UMR 7161) / Inria Saclay, UPSay, Palaiseau, France
| | - Sophie Sacquin-Mora
- Laboratoire de Biochimie Théorique, UPR 9080 CNRS Institut de Biologie Physico-Chimique, Paris, France
| | - Alessandra Carbone
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
- Institut Universitaire de France
| | | | - Stéphane Le Crom
- Sorbonne Université / UPMC, Univ. Antilles, Univ. Nice Sophia Antipolis, CNRS, Evolution Paris Seine - Institut de Biologie Paris Seine (EPS - IBPS), Paris, France
| | - Olivier Lespinet
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
| | - Martin Weigt
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
| | - Samer Abboud
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
| | - Juliana Bernardes
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
| | - Guillaume Bouvier
- Department of Structural Biology and CheImistry (CNRS UMR3528) - Center of Bioinformatics, Biostatistics and Integrative Biology (CNRS USR3756) - Structural Bioinformatics Unit, Institut Pasteur, Paris, France
| | - Chloé Dequeker
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
| | - Arnaud Ferré
- MaIAGE, INRA, UPSay, Jouy-en-Josas, France and LIMSI, CNRS, UPSay, Orsay, France
| | - Patrick Fuchs
- Sorbonne Université / UPMC, Ecole Normale Supérieure - PLS Research University, Département de Chimie, CNRS, Laboratoire des Biomolécules, UMR 7203 - Univ. Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Gaëlle Lelandais
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
| | - Pierre Poulain
- Mitochondria, Metals and Oxidative Stress Group, Institut Jacques Monod, UMR 7592, Univ. Paris Diderot, CNRS, Sorbonne Paris Cité, Paris, France
| | - Hugues Richard
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
| | - Hugo Schweke
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
| | - Elodie Laine
- Sorbonne Université / UPMC, CNRS, IBPS, Laboratoire de Biologie Computationnelle et Quantitative (LCQB), UMR 7238, Paris, France
- * E-mail: (EL); (AL)
| | - Anne Lopes
- Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Univ. Paris-Sud, UPSay, Gif-sur-Yvette cedex, France
- * E-mail: (EL); (AL)
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20
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Toell T, Mayer L, Pechlaner R, Krebs S, Willeit K, Lang C, Boehme C, Prantl B, Knoflach M, Ferrari J, Fuchs P, Prokop W, Griesmacher A, Lang W, Kiechl S, Willeit J. Familial hypercholesterolaemia in patients with ischaemic stroke or transient ischaemic attack. Eur J Neurol 2017; 25:260-267. [PMID: 29053901 DOI: 10.1111/ene.13485] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 10/16/2017] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE Identification of patients with familial hypercholesterolaemia (FH) is a prerequisite for the appropriate management of their excess cardiovascular risk. It is currently unknown how many patients with acute ischaemic stroke or transient ischaemic attack (TIA) are affected by FH and whether systematic screening for FH is warranted in these patients. METHODS The prevalence of a clinical diagnosis of FH was estimated in a large representative series of patients with acute ischaemic stroke or TIA (ABCD2 score ≥ 3) using the Dutch Lipid Clinic Network Algorithm (DLCNA; possible FH ≥3, probable/definite FH ≥6). RESULTS Out of 1054 patients included in the present analysis, 14 had probable/definite FH (1.3%; 95% confidence interval 0.6-2.0) and 107 possible FH (10.2%; 8.4-12.0) corresponding to an overall prevalence of potential FH of 11.5%. Prevalences were even higher in patients with stroke/TIA manifestation before age 55 in men or 60 in women (3.1%, 0.6-5.6; and 13.1%, 8.3-17.9) and those with a prior history of cardiovascular disease (2.6%, 0.9-4.3; and 15.1%, 11.3-18.9). Of note, in two-thirds of our patients with probable/definite and possible FH, stroke or TIA was the initial clinical disease manifestation. CONCLUSIONS The frequency of potential FH, based on clinical criteria, in patients with acute ischaemic stroke or TIA was 11.5% and that of probable/definite FH (1.3%) was similar to recently reported counts for patients with acute coronary syndrome (1.6%). FH screening using the DLCNA is feasible in clinical routine and should be considered as part of the usual diagnostic work-up.
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Affiliation(s)
- T Toell
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - L Mayer
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - R Pechlaner
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - S Krebs
- Department of Neurology, Hospital Barmherzige Brueder, Vienna, Austria
| | - K Willeit
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - C Lang
- Department of Neurology, Hospital Barmherzige Brueder, Vienna, Austria
| | - C Boehme
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - B Prantl
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - M Knoflach
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - J Ferrari
- Department of Neurology, Hospital Barmherzige Brueder, Vienna, Austria
| | - P Fuchs
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - W Prokop
- Central Institute of Medical and Chemical Laboratory Diagnostics, University Hospital of Innsbruck, Innsbruck, Austria
| | - A Griesmacher
- Central Institute of Medical and Chemical Laboratory Diagnostics, University Hospital of Innsbruck, Innsbruck, Austria
| | - W Lang
- Department of Neurology, Hospital Barmherzige Brueder, Vienna, Austria
| | - S Kiechl
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - J Willeit
- Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
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21
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Senac C, Fuchs P, Urbach W, Taulier N. Does the Presence of a Co-Solvent Alter the Affinity of a Hydrophobic Drug to its Target? Biophys J 2017. [DOI: 10.1016/j.bpj.2016.11.2667] [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: 11/24/2022] Open
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22
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Kremer T, Bauer M, Zahn P, Wallner C, Fuchs P, Horch RE, Schaefer DJ, Bader RD, Lehnhardt M, Reichert B, Pierer G, Hirche C, Kneser U. [Perioperative Management in Microsurgery - Consensus Statement of the German Speaking Society for Microsurgery of Peripheral Nerves and Vessels]. HANDCHIR MIKROCHIR P 2016; 48:205-11. [PMID: 27547928 DOI: 10.1055/s-0042-108806] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Perioperative management of microsurgery is not well standardised. Due to a lack of evidence, different regimes are established in different microsurgical centres. However, trends towards less aggressive perioperative interventions can be identified in recent years, since treatment algorithms without systematic evidence are being progressively abandoned. The available evidence on perioperative issues, such as temperature control, fluid resuscitation, blood transfusions, application of vasodilators or - pressors, as well as anticoagulants, were discussed during the consensus conference on perioperative management at the annual meeting of the German Speaking Society for Microsurgery of Peripheral Nerves and Vessels. Common basic standards were identified and a consensus was reached that is described in the following manuscript.
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Affiliation(s)
- T Kremer
- Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, - Schwerbrandverletztenzentrum - , BG-Klinik Ludwigshafen, Hand- und Plastische Chirurgie, Universität Heidelberg
| | - M Bauer
- Universitätsklinik für Anästhesiologie, Intensiv-, Palliativ und Schmerzmedizin, Berufsgenossenschaftliches Universitätsklinikum Bergmannsheil Bochum
| | - P Zahn
- Universitätsklinik für Anästhesiologie, Intensiv-, Palliativ und Schmerzmedizin, Berufsgenossenschaftliches Universitätsklinikum Bergmannsheil Bochum
| | - C Wallner
- Universitätsklinik für Plastische Chirurgie und Schwerbrandverletzte, Handchirurgiezentrum, Operatives Referenzzentrum für Gliedmaßentumoren, Berufsgenossenschaftliches Universitätsklinikum Bergmannsheil
| | - P Fuchs
- Klinik für Plastische und Ästhetische Chirurgie, Handchirurgie, Schwerbrandverletztenzentrum; Kliniken Köln Merheim, Universität Witten/Herdecke
| | - R E Horch
- Plastisch- und Handchirurgische Klinik, Universitätsklinikum Erlangen
| | - D J Schaefer
- Plastische, Rekonstruktive, Ästhetische Chirurgie und Handchirurgie, Universitätsspital Basel
| | - R D Bader
- Mund-, Kiefer- und Gesichtschirurgie, Berufsgenossenschaftliche Unfallklinik Murnau
| | - M Lehnhardt
- Universitätsklinik für Plastische Chirurgie und Schwerbrandverletzte, Handchirurgiezentrum, Operatives Referenzzentrum für Gliedmaßentumoren, Berufsgenossenschaftliches Universitätsklinikum Bergmannsheil
| | - B Reichert
- Klinik für Plastische, Wiederherstellende und Handchirurgie, Zentrum für Schwerbrandverletzte Klinikum Nürnberg, Universitätsklinik der Paracelsus Medizinischen Privatuniversität
| | - G Pierer
- Universitätsklinik für Plastische, Rekonstruktive und Ästhetische Chirurgie, Medizinische Universität Innsbruck
| | - C Hirche
- Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, - Schwerbrandverletztenzentrum - , BG-Klinik Ludwigshafen, Hand- und Plastische Chirurgie, Universität Heidelberg
| | - U Kneser
- Klinik für Hand-, Plastische und Rekonstruktive Chirurgie, - Schwerbrandverletztenzentrum - , BG-Klinik Ludwigshafen, Hand- und Plastische Chirurgie, Universität Heidelberg
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Senac C, Fuchs P, Urbach W, Taulier N. Effect of a Cosolvent in Binding Events of Hydrophobic Molecules. An Experimental and Numerical Study. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.332] [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: 11/30/2022] Open
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Knapstein J, Fuchs P, Daniel G, Darstein F, Marquardt J, Sprinzl M, Schattenberg J, Wörns MA, Lautem A, Hoppe-Lotichius M, Lang H, Galle PR, Zimmermann T. Relevance of organic cation transporter OCT1 (SLC22A1) in Diethylnitrosamine-initiated and Phenobarbital-promoted hepatocellular carcinoma in OCT3- knockout mice. Z Gastroenterol 2015. [DOI: 10.1055/s-0034-1397195] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mouret L, Vamparys L, Moser von Filseck J, Fuchs P, Bondon A, Drin G. Structural Basis of Membrane Curvature Recognition by the ALPS Motifs. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Urbach W, Adrien V, Rayan G, Taulier N, Fuchs P. Can Lipids be used as Mobility Standards in Artificial Bilayers? Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Charlier L, Louet M, Chaloin L, Fuchs P, Martinez J, Muriaux D, Favard C, Floquet N. Coarse-grained simulations of the HIV-1 matrix protein anchoring: revisiting its assembly on membrane domains. Biophys J 2014; 106:577-85. [PMID: 24507598 DOI: 10.1016/j.bpj.2013.12.019] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 11/21/2013] [Accepted: 12/06/2013] [Indexed: 11/25/2022] Open
Abstract
In the accepted model for human immunodeficiency virus preassembly in infected host cells, the anchoring to the intracellular leaflet of the membrane of the matrix domain (MA) that lies at the N-terminus of the viral Gag protein precursor appears to be one of the crucial steps for particle assembly. In this study, we simulated the membrane anchoring of human immunodeficiency virus-1 myristoylated MA protein using a coarse-grained representation of both the protein and the membrane. Our calculations first suggest that the myristoyl group could spontaneously release from its initial hydrophobic pocket before MA protein interacts with the lipid membrane. All-atom simulations confirmed this possibility with a related energy cost estimated to be ~5 kcal.mol(-1). The phosphatidylinositol (4,5) bisphosphate (PI(4,5)P2) head binds preferentially to the MA highly basic region as described in available NMR data, but interestingly without flipping of its 2' acyl chain into the MA protein. Moreover, MA was able to confine PI(4,5)P2 lipids all around its molecular surface after having found a stable orientation at the membrane surface. Our results suggest that this orientation is dependent on Myr anchoring and that this confinement induces a lateral segregation of PI(4,5)P2 in domains. This is consistent with a PI(4,5)P2 enrichment of the virus envelope as compared to the host cell membrane.
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Affiliation(s)
- Landry Charlier
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR5247, Université Montpellier 1, Université Montpellier 2, Faculté de Pharmacie, Montpellier cedex 05, France
| | - Maxime Louet
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR5247, Université Montpellier 1, Université Montpellier 2, Faculté de Pharmacie, Montpellier cedex 05, France
| | - Laurent Chaloin
- Centre d'études d'agents Pathogènes et Biotechnologies pour la Santé (CPBS) CNRS-UMR 5236, Université Montpellier 1 - Université Montpellier 2, Montpellier Cedex 5, France
| | - Patrick Fuchs
- Dynamique des Structures et Interactions des Macromolécules Biologiques INTS, INSERM UMR-S665, Université Paris Diderot, Alexandre Cabanel, Paris
| | - Jean Martinez
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR5247, Université Montpellier 1, Université Montpellier 2, Faculté de Pharmacie, Montpellier cedex 05, France
| | - Delphine Muriaux
- Centre d'études d'agents Pathogènes et Biotechnologies pour la Santé (CPBS) CNRS-UMR 5236, Université Montpellier 1 - Université Montpellier 2, Montpellier Cedex 5, France
| | - Cyril Favard
- Centre d'études d'agents Pathogènes et Biotechnologies pour la Santé (CPBS) CNRS-UMR 5236, Université Montpellier 1 - Université Montpellier 2, Montpellier Cedex 5, France.
| | - Nicolas Floquet
- Institut des Biomolécules Max Mousseron (IBMM), CNRS UMR5247, Université Montpellier 1, Université Montpellier 2, Faculté de Pharmacie, Montpellier cedex 05, France.
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Floch AG, Tareste D, Fuchs P, Chadrin A, Naciri I, Leger T, Schlenstedt G, Palancade B, Doye V. Nuclear pore targeting of the yeast Pom33 nucleoporin depends on karyopherin- and lipid-binding. J Cell Sci 2014; 128:305-16. [DOI: 10.1242/jcs.158915] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Pom33 is an integral membrane protein of the yeast nuclear pore complex (NPC), required for proper NPC distribution and assembly. To characterize Pom33 NPC-targeting determinants, we performed immunoprecipitation experiments followed by mass spectrometry analyses. This identified a novel Pom33 partner, the nuclear import factor Kap123. In vitro experiments revealed a direct interaction between Pom33 C-terminal domain (CTD) and Kap123. In silico analysis predicted the presence of two amphipathic α-helices within Pom33-CTD. Circular dichroism and liposome co-flotation assays showed that this domain is able to fold into α-helices in the presence of liposomes and preferentially binds to highly curved lipid membranes. When expressed in yeast, under conditions abolishing Pom33-CTD membrane association, this domain behaves as a Kap123-dependent nuclear localization signal (NLS). While deletion of Pom33 C-terminal domain (Pom33ΔCTD-GFP) impairs Pom33 stability and NPC targeting, mutants affecting either Kap123 binding or the amphipathic properties of the α-helices do not display any detectable defect. However, combined impairment of lipid and Kap123 binding affects Pom33 targeting to NPCs. These data highlight the requirement of multiple determinants and mechanisms for proper NPC localization of Pom33.
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Klinger E, Kadri A, Sorita E, Le Guiet JL, Coignard P, Fuchs P, Leroy L, du Lac N, Servant F, Joseph PA. AGATHE: A tool for personalized rehabilitation of cognitive functions based on simulated activities of daily living. Ing Rech Biomed 2013. [DOI: 10.1016/j.irbm.2013.01.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Fuchs P, Wenning G. Atypische Parkinsonsyndrome – Neues aus Diagnostik und Therapie. Akt Neurol 2013. [DOI: 10.1055/s-0032-1331773] [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: 10/27/2022]
Affiliation(s)
- P. Fuchs
- Universitätsklinik für Neurologie, Medizinische Universität Innsbruck, Österreich
| | - G. Wenning
- Universitätsklinik für Neurologie, Medizinische Universität Innsbruck, Österreich
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Vamparys L, Vanni S, Gautier R, Drin G, Antonny B, Etchebest C, Fuchs P. Molecular Dynamics Study of a Protein Motif that Senses Packing Defects Induced by Membrane Curvature. Biophys J 2013. [DOI: 10.1016/j.bpj.2012.11.3655] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Fuchs P, Schreiner W, Wolter T, Autschbach R, Sirbu H, Pallua N. A four-muscle-flap for thoracomyoplasty in patients with sacrificed thoracodorsal vessels. J Plast Reconstr Aesthet Surg 2011; 64:335-8. [DOI: 10.1016/j.bjps.2010.05.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 03/29/2010] [Accepted: 05/07/2010] [Indexed: 10/19/2022]
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Andreas B, Azuma Y, Bartl G, Becker P, Bettin H, Borys M, Busch I, Gray M, Fuchs P, Fujii K, Fujimoto H, Kessler E, Krumrey M, Kuetgens U, Kuramoto N, Mana G, Manson P, Massa E, Mizushima S, Nicolaus A, Picard A, Pramann A, Rienitz O, Schiel D, Valkiers S, Waseda A. Determination of the Avogadro constant by counting the atoms in a 28Si crystal. Phys Rev Lett 2011; 106:030801. [PMID: 21405263 DOI: 10.1103/physrevlett.106.030801] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 12/09/2010] [Indexed: 05/30/2023]
Abstract
The Avogadro constant links the atomic and the macroscopic properties of matter. Since the molar Planck constant is well known via the measurement of the Rydberg constant, it is also closely related to the Planck constant. In addition, its accurate determination is of paramount importance for a definition of the kilogram in terms of a fundamental constant. We describe a new approach for its determination by counting the atoms in 1 kg single-crystal spheres, which are highly enriched with the 28Si isotope. It enabled isotope dilution mass spectroscopy to determine the molar mass of the silicon crystal with unprecedented accuracy. The value obtained, NA = 6.022,140,78(18) × 10(23) mol(-1), is the most accurate input datum for a new definition of the kilogram.
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Affiliation(s)
- B Andreas
- PTB-Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
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Wolter TP, Fuchs P, Pallua N. [Alloplastic cancellous bone replacement and fibrin glue in hand surgery]. HANDCHIR MIKROCHIR P 2010; 42:317-21. [PMID: 20827666 DOI: 10.1055/s-0030-1254111] [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: 10/19/2022] Open
Abstract
INTRODUCTION Alloplastic replacement of cancellous bone is being increasingly used in the clinical setting. The use in hand surgery, however, is only sparsely documented. MATERIALS AND METHODS We report about the use of micro- and macroporous biphasic calicium phosphate granulate (Tricos (®)) in combination with fibrin sealant (Tissucol (®)) in six patients undergoing surgery of the hand involving cancellous bone deficits. The indications ranged from carpal stabilisation to DIP athrodesis. Follow-up time was up to 15 months. RESULTS Because cancellous bone harvesting could be avoided, morbidity and the extent of surgery could be reduced in all patients. Healing was uneventful and the clinical course as documented by X-ray controls, toleration of physiotherapeutic exercises and stability was analogous to that of conventional surgery involving cancellous bone grafting. CONCLUSION These first results indicate that alloplastic replacement of spongiosa grafts, especially by micro- and macroporous biphasic calcium phosphate granulate can possibly be successfully used in surgery of the hand. The extent of bony remodelling still needs to be determined by further examination.
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Affiliation(s)
- T P Wolter
- Klinik für Plastische Chirurgie, Hand- u. Verbrennungschirurgie, Universitätsklinikum der Medizinischen Fakultät der RWTH Aachen.
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Schreiner W, Fuchs P, Autschbach R, Pallua N, Sirbu H. Modified Technique for Thoracomyoplasty after Posterolateral Thoracotomy. Thorac Cardiovasc Surg 2010; 58:98-101. [DOI: 10.1055/s-0029-1186268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kaspar F, Hollmann R, Lockhoff M, Karlsson KG, Dybbroe A, Fuchs P, Selbach N, Stein D, Schulz J. Operational generation of AVHRR-based cloud products for Europe and the Arctic at EUMETSAT's Satellite Application Facility on Climate Monitoring (CM-SAF). Adv Sci Res 2009. [DOI: 10.5194/asr-3-45-2009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. The Satelite Application Facility on Climate Monitoring has implemented a new processing environment for AVHRR-based climate monitoring products. AVHRR measurements from NOAA-17, NOAA-18 and MetOp-A are utilized to generate daily and monthly means of several cloud parameters for Europe and the Inner Arctic: Cloud fraction, cloud types, cloud phase, cloud top height, cloud optical thickness and cloud liquid water path.
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Groger A, Bozkurt A, Franke E, Hornchen H, Steinau G, Piatkowski A, Fuchs P, Pallua N. Ischaemic necrosis of small and large intestine in a 2-year-old child with 20% partial thickness burns: A case report. Burns 2005; 31:930-2. [PMID: 16199300 DOI: 10.1016/j.burns.2005.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- A Groger
- Department of Plastic, Reconstructive, and Hand Surgery, Burn Center, University Hospital RWTH, Aachen, Germany
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Kalir A, Teomy S, Amir A, Fuchs P, Lee S, Holsztynska E, Rocki W, Domino E. Additions and Corrections - N-Allyl Analogues of Phencyclidine: Chemical Synthesis and Pharmacological Properties. J Med Chem 2004. [DOI: 10.1021/jm00150a601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tzakos AG, Fuchs P, van Nuland NAJ, Troganis A, Tselios T, Deraos S, Matsoukas J, Gerothanassis IP, Bonvin AMJJ. NMR and molecular dynamics studies of an autoimmune myelin basic protein peptide and its antagonist: structural implications for the MHC II (I-Au)-peptide complex from docking calculations. ACTA ACUST UNITED AC 2004; 271:3399-413. [PMID: 15291817 DOI: 10.1111/j.1432-1033.2004.04274.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [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: 11/27/2022]
Abstract
Experimental autoimmune encephalomyelitis can be induced in susceptible animals by immunodominant determinants of myelin basic protein (MBP). To characterize the molecular features of antigenic sites important for designing experimental autoimmune encephalomyelitis suppressing molecules, we report structural studies, based on NMR experimental data in conjunction with molecular dynamic simulations, of the potent linear dodecapeptide epitope of guinea pig MBP, Gln74-Lys75-Ser76-Gln77-Arg78-Ser79-Gln80-Asp81-Glu82-Asn83-Pro84-Val85 [MBP(74-85)], and its antagonist analogue Ala81MBP(74-85). The two peptides were studied in both water and Me(2)SO in order to mimic solvent-dependent structural changes in MBP. The agonist MBP(74-85) adopts a compact conformation because of electrostatic interactions of Arg78 with the side chains of Asp81 and Glu82. Arg78 is 'locked' in a well-defined conformation, perpendicular to the peptide backbone which is practically solvent independent. These electrostatic interactions are, however, absent from the antagonist Ala81MBP(74-85), resulting in great flexibility of the side chain of Arg78. Sequence alignment of the two analogues with several species of MBP suggests a critical role for the positively charged residue Arg78, firstly, in the stabilization of the local microdomains (epitopes) of the integral protein, and secondly, in a number of post-translational modifications relevant to multiple sclerosis, such as the conversion of charged arginine residues to uncharged citrullines. Flexible docking calculations on the binding of the MBP(74-85) antigen to the MHC class II receptor site I-A(u) using haddock indicate that Gln74, Ser76 and Ser79 are MHC II anchor residues. Lys75, Arg78 and Asp81 are prominent, solvent-exposed residues and, thus, may be of importance in the formation of the trimolecular T-cell receptor-MBP(74-85)-MHC II complex.
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Affiliation(s)
- Andreas G Tzakos
- Department of Chemistry, Section of Organic Chemistry and Biochemistry, University of Ioannina, Greece
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Yakubov E, Gottlieb M, Gil S, Dinerman P, Fuchs P, Yavin E. Overexpression of genes in the CA1 hippocampus region of adult rat following episodes of global ischemia. ACTA ACUST UNITED AC 2004; 127:10-26. [PMID: 15306117 DOI: 10.1016/j.molbrainres.2004.05.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2004] [Indexed: 12/29/2022]
Abstract
Ischemic stress is associated with marked changes in gene expression in the hippocampus--albeit little information exists on the activation of nonabundant genes. We have examined the expression of several known genes and identified novel ones in the adult rat hippocampus after a mild, transient, hypovolemic and hypotensive, global ischemic stress. An initial differential screening using a prototype array to assess gene expression after stress followed by a suppression subtractive hybridization protocol and cDNA microarray revealed 124 nonoverlapped transcripts predominantly expressed in the CA1 rat hippocampus region in response to ischemic stress. About 78% of these genes were not detected with nonsubtracted probes. Reverse transcription polymerase chain reaction (RT-PCR) and in situ hybridization on these 124 transcripts confirmed the differential expression of at least 83. Most robustly expressed were gene sequences NFI-B, ATP1B1, RHOGAP, PLA2G4A, BAX, CASP3, P53, MAO-A, FRA1, HSP70.2, and NR4A1 (NUR77), as well as sequence tags of unknown function. New stress-related genes of similar functional motifs were identified, reemphasizing the importance of functional grouping in the analysis of multiple gene expression profiles. These data indicate that ischemia elicits expression of an array of functional gene clusters that may be used as an index for stress severity and a template for target therapy design.
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MESH Headings
- Animals
- Blotting, Northern
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/metabolism
- Gene Expression/physiology
- Gene Expression Profiling
- Gene Expression Regulation
- HSP70 Heat-Shock Proteins/genetics
- HSP70 Heat-Shock Proteins/metabolism
- Hippocampus/anatomy & histology
- Hippocampus/metabolism
- In Situ Hybridization/methods
- Ischemic Attack, Transient/genetics
- Ischemic Attack, Transient/metabolism
- Male
- Nuclear Receptor Subfamily 4, Group A, Member 1
- Oligonucleotide Array Sequence Analysis/methods
- RNA, Messenger/metabolism
- Rats
- Rats, Wistar
- Receptors, Cytoplasmic and Nuclear
- Receptors, Steroid
- Reverse Transcriptase Polymerase Chain Reaction/methods
- Transcription Factors/genetics
- Transcription Factors/metabolism
- Transcription, Genetic
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- E Yakubov
- Department of Neurobiology, The Weizmann Institute of Science, Rehovot 76100, Israel
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Heim M, Frank O, Kampmann G, Sochocky N, Pennimpede T, Fuchs P, Hunziker W, Weber P, Martin I, Bendik I. The phytoestrogen genistein enhances osteogenesis and represses adipogenic differentiation of human primary bone marrow stromal cells. Endocrinology 2004; 145:848-59. [PMID: 14605006 DOI: 10.1210/en.2003-1014] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.9] [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: 11/19/2022]
Abstract
In the present study, we investigated the role of the phytoestrogen genistein and 17beta-estradiol in human bone marrow stromal cells, undergoing induced osteogenic or adipogenic differentiation. Profiling of estrogen receptors (ERs)-alpha, -beta1, -beta2, -beta3, -beta4, -beta5, and aromatase mRNAs revealed lineage-dependent expression patterns. During osteogenic differentiation, the osteoblast-determining core binding factor-alpha1 showed a progressive increase, whereas the adipogenic regulator peroxisome proliferator-activated receptor gamma (PPARgamma) was sequentially decreased. This temporal regulation of lineage-determining marker genes was strongly enhanced by genistein during the early osteogenic phase. Moreover, genistein increased alkaline phosphatase mRNA levels and activity, the osteoprotegerin:receptor activator of nuclear factor-kappaB ligand gene expression ratio, and the expression of TGFbeta1. During adipogenic differentiation, down-regulation in the mRNA levels of PPARgamma and CCAAT/enhancer-binding protein-alpha at d 3 and decreased lipoprotein lipase and adipsin mRNA levels at d 21 were observed after genistein treatment. This led to a lower number of adipocytes and a reduction in the size of their lipid droplets. At d 3 of adipogenesis, TGFbeta1 was strongly up-regulated by genistein in an ER-dependent manner. Blocking the TGFbeta1 pathway abolished the effects of genistein on PPARgamma protein levels and led to a reduction in the proliferation rate of precursor cells. Overall, genistein enhanced the commitment and differentiation of bone marrow stromal cells to the osteoblast lineage but did not influence the late osteogenic maturation markers. Adipogenic differentiation and maturation, on the other hand, were reduced by genistein (and 17beta-estradiol) via an ER-dependent mechanism involving autocrine or paracrine TGFbeta1 signaling.
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Affiliation(s)
- M Heim
- Human Nutrition and Health, Research and Development, Roche Vitamins Ltd., VFHF, 205/219A, CH-4070 Basel, Switzerland
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Shantz J, Heim M, Kampmann G, Sochocky N, Fuchs P, Schweitzer CH, Weber P, Lundstrom K, Hunziker W, Bendik I. A spin-column procedure for estrogen receptor equilibrium and competition binding analysis. J Recept Signal Transduct Res 2002; 22:497-507. [PMID: 12503637 DOI: 10.1081/rrs-120014617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Estrogen receptors, members of the nuclear hormone receptor family, are not only able to bind their endogenous hormone, 17beta-estradiol, but can also accommodate other naturally-occuring, non-steroidal molecules. Here, we describe a spin-column procedure to determine accurately equilibrium dissociation constants (Kds) and IC50 concentrations for estrogenic compounds. The human wild-type ERalpha was used to validate the protocol. We expressed the full-length ERalpha protein in an eukaryotic system to ensure all possible post-transcriptional modifications. The gel filtration-based assay revealed a temperature-dependent Kd shift for ERalpha. At physiological conditions (150 mM salt, 37 degrees C) we determined the 17beta-estradiol Kd for ERalpha to be 281 +/- 13 pmol/L. Positive cooperativity was only apparent at low temperatures and diminished to zero at 37 degrees C. In homologous competition binding experiments using 17beta-estradiol, we observed fifty fold higher IC50 values than the respective Kd. This paper presents a reliable and sensitive protocol to generate saturation binding curves and heterologous competition curves to test estrogenic compounds.
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Affiliation(s)
- J Shantz
- Roche Vitamins Ltd., Human Nutrition & Health, Research and Development, CH-4070 Basel, Switzerland
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Fuchs P, Segalas I, Toma F, Alix A. Spectroscopic structural study of the R2 repetition of the c-Myb transcription factor. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(01)00436-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Automobile air bags have gained acceptance as an effective measure to reduce the morbidity and mortality associated with motor vehicle accidents. As more cars have become equipped with them, new problems have been encountered that are directly attributable to the deployment of the bag itself. An increasing variety of associated injuries has been reported, including minor burns. We present two automobile drivers who were involved in front-impact crashes with air bag inflation. They sustained superficial and partial-thickness burns related to the deployment. The evaluation of these cases shows mechanisms involved in burn injuries caused by the air bag system. Most of the burns are chemical and usually attributed to sodium hydroxide in the aerosol created during deployment. Also direct thermal burns from high-temperature gases or indirect injuries due to the melting of clothing, as well as friction burns from physical contact are possible. However, the inherent risks of air bag-related burns are still outweighed by the benefits of preventing potentially life-threatening injuries.
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Affiliation(s)
- D Ulrich
- Department of Plastic Surgery, Hand Surgery - Burn Centre, Aachen University of Technology, Pauwelsstrasse 30, 52057, Aachen, Germany.
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Brassart B, Fuchs P, Huet E, Alix AJ, Wallach J, Tamburro AM, Delacoux F, Haye B, Emonard H, Hornebeck W, Debelle L. Conformational dependence of collagenase (matrix metalloproteinase-1) up-regulation by elastin peptides in cultured fibroblasts. J Biol Chem 2001; 276:5222-7. [PMID: 11084020 DOI: 10.1074/jbc.m003642200] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have established that treatment of cultured human skin fibroblasts with tropoelastin or with heterogenic peptides, obtained after organo-alkaline or leukocyte elastase hydrolysis of insoluble elastin, induces a high expression of pro-collagenase-1 (pro-matrix metalloproteinase-1 (pro-MMP-1)). The identical effect was achieved after stimulation with a VGVAPG synthetic peptide, reflecting the elastin-derived domain known to bind to the 67-kDa elastin-binding protein. This clearly indicated involvement of this receptor in the described phenomenon. This notion was further reinforced by the fact that elastin peptides-dependent MMP-1 up-regulation has not been demonstrated in cultures preincubated with 1 mm lactose, which causes shedding of the elastin-binding protein and with pertussis toxin, which blocks the elastin-binding protein-dependent signaling pathway involving G protein, phospholipase C, and protein kinase C. Moreover, we demonstrated that diverse peptides maintaining GXXPG sequences can also induce similar cellular effects as a "principal" VGVAPG ligand of the elastin receptor. Results of our biophysical studies suggest that this peculiar consensus sequence stabilizes a type VIII beta-turn in several similar, but not identical, peptides that maintain a sufficient conformation to be recognized by the elastin receptor. We have also established that GXXPG elastin-derived peptides, in addition to pro-MMP-1, cause up-regulation of pro-matrix metalloproteinase-3 (pro-stromelysin 1). Furthermore, we found that the presence of plasmin in the culture medium activated these MMP proenzymes, leading to a consequent degradation of collagen substrate. Our results may be, therefore, relevant to pathobiology of inflammation, in which elastin-derived peptides bearing the GXXPG conformation (created after leukocyte-dependent proteolysis) bind to the elastin receptor of local fibroblasts and trigger signals leading to expression and activation of MMP-1 and MMP-3, which in turn exacerbate local connective tissue damage.
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Affiliation(s)
- B Brassart
- UPRES-A CNRS 6021, IFR53 Biomolécules, Faculties of Sciences and Medicine, IFR53 Biomolécules, Faculty of Sciences, University of Reims, 51687 Reims, France
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Lustig S, Halevy M, Fuchs P, Ben-Nathan D, Lachmi BE, Kobiler D, Israeli E, Olshevsky U. Can West Nile virus outbreaks be controlled? Isr Med Assoc J 2000; 2:733-7. [PMID: 11344722] [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: 02/20/2023]
Affiliation(s)
- S Lustig
- Department of Infectious Diseases, Israel Institute for Biological Research, Ness Ziona, Israel.
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