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Požar M, Bolle J, Dogan-Surmeier S, Schneider E, Paulus M, Sternemann C, Perera A. On the dual behaviour of water in octanol-rich aqueous n-octanol mixtures: an X-ray scattering and computer simulation study. Phys Chem Chem Phys 2024; 26:4099-4110. [PMID: 38226462 DOI: 10.1039/d3cp04651f] [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: 01/17/2024]
Abstract
Aqueous n-octanol (n = 1, 2, 3, and 4) mixtures from the octanol rich side are studied by X-ray scattering and computer simulation, with a focus on structural changes, particularly in what concerns the hydration of the hydroxyl-group aggregated chain-like structures, under the influence of various branching of the alkyl tails. Previous studies have indicated that hydroxyl-group chain-cluster formation is hindered in proportion to the branching number. Here, water mole fractions up to x = 0.2 are examined, i.e. up to the miscibility limit. It is found that water molecules within the hydroxyl-chain domains participate in the chain formations in a different manner for 1-octanol and the branched octanols. The hydration of the octanol hydroxyl chains is confirmed by the shifting of the scattering pre-peak position kPP to smaller values, both from measured and simulated X-ray scattering intensities, which corresponds to an increased size of the clusters. Experimental pre-peak amplitudes are seen to increase with increasing water content for 1-octanol, while this trend is reversed in all branched octanols, with the amplitudes decreasing with the increase of the branching number. Conjecturing that the amplitudes of pre-peaks are related to the density of the corresponding aggregates, these results are interpreted as water breaking large OH hydroxyl chains in 1-octanol, hence increasing the density of aggregates, while enhancing hydroxyl aggregates in branched alcohols by inserting itself into the OH chains. The analysis of the cluster distributions from computer simulations provide more details on the role of water. For cluster sizes smaller than dc = 2π/kPP, water is found to always play the role of a structure enforcer for all n-octanols, while for clusters of size dc water is always a destructor. For cluster sizes larger than dc, the role of water differs from 1-octanol and the branched ones: it acts as a structure maker or breaker in inverse proportion to the hindering of OH hydroxyl chain structures arising from the topology of the alkyl tails (branched or not).
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Affiliation(s)
- Martina Požar
- Faculty of Science, University of Split, Ru era Boškovic'a 33, 21000 Split, Croatia.
| | - Jennifer Bolle
- Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany
| | | | - Eric Schneider
- Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany
| | - Christian Sternemann
- Fakultät Physik/DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany
| | - Aurélien Perera
- Laboratoire de Physique Théorique de la Matière Condensée (UMR CNRS 7600), Sorbonne Université, 4 Place Jussieu, F75252, Paris cedex 05, France.
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2
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Anthuparambil ND, Girelli A, Timmermann S, Kowalski M, Akhundzadeh MS, Retzbach S, Senft MD, Dargasz M, Gutmüller D, Hiremath A, Moron M, Öztürk Ö, Poggemann HF, Ragulskaya A, Begam N, Tosson A, Paulus M, Westermeier F, Zhang F, Sprung M, Schreiber F, Gutt C. Exploring non-equilibrium processes and spatio-temporal scaling laws in heated egg yolk using coherent X-rays. Nat Commun 2023; 14:5580. [PMID: 37696830 PMCID: PMC10495384 DOI: 10.1038/s41467-023-41202-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 08/23/2023] [Indexed: 09/13/2023] Open
Abstract
The soft-grainy microstructure of cooked egg yolk is the result of a series of out-of-equilibrium processes of its protein-lipid contents; however, it is unclear how egg yolk constituents contribute to these processes to create the desired microstructure. By employing X-ray photon correlation spectroscopy, we investigate the functional contribution of egg yolk constituents: proteins, low-density lipoproteins (LDLs), and yolk-granules to the development of grainy-gel microstructure and microscopic dynamics during cooking. We find that the viscosity of the heated egg yolk is solely determined by the degree of protein gelation, whereas the grainy-gel microstructure is controlled by the extent of LDL aggregation. Overall, protein denaturation-aggregation-gelation and LDL-aggregation follows Arrhenius-type time-temperature superposition (TTS), indicating an identical mechanism with a temperature-dependent reaction rate. However, above 75 °C TTS breaks down and temperature-independent gelation dynamics is observed, demonstrating that the temperature can no longer accelerate certain non-equilibrium processes above a threshold value.
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Affiliation(s)
- Nimmi Das Anthuparambil
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.
- Department Physik, Universität Siegen, 57072, Siegen, Germany.
| | - Anita Girelli
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | | | - Marvin Kowalski
- Department Physik, Universität Siegen, 57072, Siegen, Germany
| | | | - Sebastian Retzbach
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Maximilian D Senft
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | | | - Dennis Gutmüller
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Anusha Hiremath
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Marc Moron
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221, Dortmund, Germany
| | - Özgül Öztürk
- Department Physik, Universität Siegen, 57072, Siegen, Germany
| | | | | | - Nafisa Begam
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Amir Tosson
- Department Physik, Universität Siegen, 57072, Siegen, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221, Dortmund, Germany
| | - Fabian Westermeier
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Michael Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, 72076, Tübingen, Germany
| | - Christian Gutt
- Department Physik, Universität Siegen, 57072, Siegen, Germany.
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3
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Jopen M, Paulus M, Sternemann C, Degen P, Weberskirch R. Comparative Studies on the Organogel Formation of a Polyester in Three Different Base Oils by X-ray Analysis, Rheology and Infrared Spectroscopy. Gels 2023; 9:696. [PMID: 37754377 PMCID: PMC10530540 DOI: 10.3390/gels9090696] [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: 07/18/2023] [Revised: 08/16/2023] [Accepted: 08/24/2023] [Indexed: 09/28/2023] Open
Abstract
High-performance greases typically consist of a base oil and polyurea as a thickener material. To date, few alternatives to polyureas have been investigated. Polyesters could be one such alternative; however, little is known about the gelation of such polyesters because, unlike polyureas, they cannot form hydrogen bonds between the polymer chains. Here, we present studies on the gel formation of a polyester based thickener poly(hexane dodecanoate) with 1-octanol endgroups in three different base oils, i.e., a mineral oil (Brightstock 150), a synthetic Polyalphaolefin (Spectrasyn 40) and castor oil (85 to 90 wt.% ricinoleic acid triglyceride). Small- and wide-angle X-ray scattering measurements indicate a strong interaction of the polyester with castor oil and an increase in the crystalline fraction, with an increasing polymer amount from 5 to 40 wt.%. Moreover, infrared analysis of the polyester in castor oil showed gel formation at a minimum concentration of 20 wt.%. The strong interaction of the polyester with castor oil compared to the other two base oils led to an increase in the yield point γF as a measure of the mechanical stability of the gel, which was determined to be 5.9% compared to 0.8% and 1.0% in Brightstock and Spectrasyn, respectively.
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Affiliation(s)
- Max Jopen
- Carl Bechem GmbH, Weststraße 120, 58089 Hagen, Germany; (M.J.); (P.D.)
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany; (M.P.); (C.S.)
| | - Christian Sternemann
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany; (M.P.); (C.S.)
| | - Patrick Degen
- Carl Bechem GmbH, Weststraße 120, 58089 Hagen, Germany; (M.J.); (P.D.)
| | - Ralf Weberskirch
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Str. 6, 44227 Dortmund, Germany
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Núñez-López A, Torres-Cavanillas R, Morant-Giner M, Vassilyeva N, Mattana R, Tatay S, Ohresser P, Otero E, Fonda E, Paulus M, Rubio-Giménez V, Forment-Aliaga A, Coronado E. Hybrid Heterostructures of a Spin Crossover Coordination Polymer on MoS 2 : Elucidating the Role of the 2D Substrate. Small 2023:e2304954. [PMID: 37594729 DOI: 10.1002/smll.202304954] [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] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/20/2023] [Indexed: 08/19/2023]
Abstract
Controlling the deposition of spin-crossover (SCO) materials constitutes a crucial step for the integration of these bistable molecular systems in electronic devices. Moreover, the influence of functional surfaces, such as 2D materials, can be determinant on the properties of the deposited SCO film. In this work, ultrathin films of the SCO Hofmann-type coordination polymer [Fe(py)2 {Pt(CN)4 }] (py = pyridine) onto monolayers of 1T and 2H MoS2 polytypes are grown. The resulting hybrid heterostructures are characterized by GIXRD, XAS, XPS, and EXAFS to get information on the structure and the specific interactions generated at the interface, as well as on the spin transition. The use of a layer-by-layer results in SCO/2D heterostructures, with crystalline and well-oriented [Fe(py)2 {Pt(CN)4 }]. Unlike with conventional Au or SiO2 substrates, no intermediate self-assembled monolayer is required, thanks to the surface S atoms. Furthermore, it is observed that the higher presence of Fe3+ in the 2H heterostructures hinders an effective spin transition for [Fe(py)2 {Pt(CN)4 }] films thinner than 8 nm. Remarkably, when using 1T MoS2 , this transition is preserved in films as thin as 4 nm, due to the reducing character of this metallic substrate. These results highlight the active role that 2D materials play as substrates in hybrid molecular/2D heterostructures.
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Affiliation(s)
- Alejandro Núñez-López
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
| | - Ramón Torres-Cavanillas
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
- Department of Materials, University of Oxford, OX1 3PH, Oxford, UK
| | - Marc Morant-Giner
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, 34127, Via L. Giorgieri 1, Trieste, Italy
| | - Natalia Vassilyeva
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
| | - Richard Mattana
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Sergio Tatay
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, 91190, Saint Aubin, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, 91190, Saint Aubin, France
| | - Emiliano Fonda
- Synchrotron SOLEIL, L'Orme des Merisiers, 91190, Saint Aubin, France
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221, Dortmund, Germany
| | - Víctor Rubio-Giménez
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy (cMACS), Katholieke Universiteit Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Alicia Forment-Aliaga
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
| | - Eugenio Coronado
- Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980, Catedrático José Beltrán 2, Paterna, Spain
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5
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Vema S, Sayed FN, Nagendran S, Karagoz B, Sternemann C, Paulus M, Held G, Grey CP. Understanding the Surface Regeneration and Reactivity of Garnet Solid-State Electrolytes. ACS Energy Lett 2023; 8:3476-3484. [PMID: 37588018 PMCID: PMC10425971 DOI: 10.1021/acsenergylett.3c01042] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 07/10/2023] [Indexed: 08/18/2023]
Abstract
Garnet solid-electrolyte-based Li-metal batteries can be used in energy storage devices with high energy densities and thermal stability. However, the tendency of garnets to form lithium hydroxide and carbonate on the surface in an ambient atmosphere poses significant processing challenges. In this work, the decomposition of surface layers under various gas environments is studied by using two surface-sensitive techniques, near-ambient-pressure X-ray photoelectron spectroscopy and grazing incidence X-ray diffraction. It is found that heating to 500 °C under an oxygen atmosphere (of 1 mbar and above) leads to a clean garnet surface, whereas low oxygen partial pressures (i.e., in argon or vacuum) lead to additional graphitic carbon deposits. The clean surface of garnets reacts directly with moisture and carbon dioxide below 400 and 500 °C, respectively. This suggests that additional CO2 concentration controls are needed for the handling of garnets. By heating under O2 along with avoiding H2O and CO2, symmetric cells with less than 10 Ωcm2 interface resistance are prepared without the use of any interlayers; plating currents of >1 mA cm-2 without dendrite initiation are demonstrated.
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Affiliation(s)
- Sundeep Vema
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
- The
Faraday Institution, Quad One, Harwell Campus, Didcot OX11 0RA, United Kingdom
| | - Farheen N. Sayed
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
- The
Faraday Institution, Quad One, Harwell Campus, Didcot OX11 0RA, United Kingdom
| | - Supreeth Nagendran
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - Burcu Karagoz
- Diamond
Light Source, Harwell Science and Innovation Campus, Didcot OX11 ODE, United
Kingdom
| | | | - Michael Paulus
- Fakultät
Physik/DELTA, Technische Universität
Dortmund, 44221 Dortmund, Germany
| | - Georg Held
- Diamond
Light Source, Harwell Science and Innovation Campus, Didcot OX11 ODE, United
Kingdom
| | - Clare P. Grey
- Yusuf
Hamied Department of Chemistry, University
of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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6
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Koutsianos A, Pallach R, Frentzel-Beyme L, Das C, Paulus M, Sternemann C, Henke S. Breathing porous liquids based on responsive metal-organic framework particles. Nat Commun 2023; 14:4200. [PMID: 37452021 PMCID: PMC10349080 DOI: 10.1038/s41467-023-39887-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 06/27/2023] [Indexed: 07/18/2023] Open
Abstract
Responsive metal-organic frameworks (MOFs) that display sigmoidal gas sorption isotherms triggered by discrete gas pressure-induced structural transformations are highly promising materials for energy related applications. However, their lack of transportability via continuous flow hinders their application in systems and designs that rely on liquid agents. We herein present examples of responsive liquid systems which exhibit a breathing behaviour and show step-shaped gas sorption isotherms, akin to the distinct oxygen saturation curve of haemoglobin in blood. Dispersions of flexible MOF nanocrystals in a size-excluded silicone oil form stable porous liquids exhibiting gated uptake for CO2, propane and propylene, as characterized by sigmoidal gas sorption isotherms with distinct transition steps. In situ X-ray diffraction studies show that the sigmoidal gas sorption curve is caused by a narrow pore to large pore phase transformation of the flexible MOF nanocrystals, which respond to gas pressure despite being dispersed in silicone oil. Given the established flexible nature and tunability of a range of MOFs, these results herald the advent of breathing porous liquids whose sorption properties can be tuned rationally for a variety of technological applications.
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Affiliation(s)
- Athanasios Koutsianos
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Roman Pallach
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Louis Frentzel-Beyme
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Chinmoy Das
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, Maria-Goeppert-Mayer Str. 2, 44221, Dortmund, Germany
| | - Christian Sternemann
- Fakultät Physik/DELTA, Technische Universität Dortmund, Maria-Goeppert-Mayer Str. 2, 44221, Dortmund, Germany
| | - Sebastian Henke
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany.
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7
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Timmermann S, Anthuparambil ND, Girelli A, Begam N, Kowalski M, Retzbach S, Senft MD, Akhundzadeh MS, Poggemann HF, Moron M, Hiremath A, Gutmüller D, Dargasz M, Öztürk Ö, Paulus M, Westermeier F, Sprung M, Ragulskaya A, Zhang F, Schreiber F, Gutt C. X-ray driven and intrinsic dynamics in protein gels. Sci Rep 2023; 13:11048. [PMID: 37422480 PMCID: PMC10329714 DOI: 10.1038/s41598-023-38059-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 07/02/2023] [Indexed: 07/10/2023] Open
Abstract
We use X-ray photon correlation spectroscopy to investigate how structure and dynamics of egg white protein gels are affected by X-ray dose and dose rate. We find that both, changes in structure and beam-induced dynamics, depend on the viscoelastic properties of the gels with soft gels prepared at low temperatures being more sensitive to beam-induced effects. Soft gels can be fluidized by X-ray doses of a few kGy with a crossover from stress relaxation dynamics (Kohlrausch-Williams-Watts exponents [Formula: see text] to 2) to typical dynamical heterogeneous behavior ([Formula: see text]1) while the high temperature egg white gels are radiation-stable up to doses of 15 kGy with [Formula: see text]. For all gel samples we observe a crossover from equilibrium dynamics to beam induced motion upon increasing X-ray fluence and determine the resulting fluence threshold values [Formula: see text]. Surprisingly small threshold values of [Formula: see text] s[Formula: see text] nm[Formula: see text] can drive the dynamics in the soft gels while for stronger gels this threshold is increased to [Formula: see text] s[Formula: see text] nm[Formula: see text]. We explain our observations with the viscoelastic properties of the materials and can connect the threshold dose for structural beam damage with the dynamic properties of beam-induced motion. Our results suggest that soft viscoelastic materials can display pronounced X-ray driven motion even for low X-ray fluences. This induced motion is not detectable by static scattering as it appears at dose values well below the static damage threshold. We show that intrinsic sample dynamics can be separated from X-ray driven motion by measuring the fluence dependence of the dynamical properties.
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Affiliation(s)
- Sonja Timmermann
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany.
| | - Nimmi Das Anthuparambil
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Anita Girelli
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Nafisa Begam
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Marvin Kowalski
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany
| | - Sebastian Retzbach
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Maximilian Darius Senft
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | | | | | - Marc Moron
- Fakultät Physik/DELTA, TU Dortmund, Maria-Goeppert-Mayer-Str. 2, 44227, Dortmund, Germany
| | - Anusha Hiremath
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Dennis Gutmüller
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Michelle Dargasz
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany
| | - Özgül Öztürk
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, Maria-Goeppert-Mayer-Str. 2, 44227, Dortmund, Germany
| | - Fabian Westermeier
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Michael Sprung
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Anastasia Ragulskaya
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Fajun Zhang
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Frank Schreiber
- Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076, Tübingen, Germany
| | - Christian Gutt
- Department Physik, Universität Siegen, Walter-Flex-Str. 3, 57072, Siegen, Germany.
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8
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Meindl C, Paulus M, Poschenrieder F, Hamer OW, Zeman F, Maier LS, Debl K. Left atrial strain parameters derived by echocardiography are impaired in patients with acute myocarditis and preserved systolic left ventricular function. Int J Cardiovasc Imaging 2023; 39:1157-1165. [PMID: 36961599 PMCID: PMC10036985 DOI: 10.1007/s10554-023-02827-9] [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] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 03/03/2023] [Indexed: 03/25/2023]
Abstract
PURPOSE Data derived by cardiac magnetic resonance (CMR) feature tracking suggest that not only left ventricular but also left atrial function is impaired in patients with acute myocarditis. Therefore, we investigated the diagnostic value of speckle tracking echocardiography of the left ventricle and left atrium in patients with acute myocarditis and normal left ventricular ejection fraction (LVEF). METHODS AND RESULTS 30 patients with acute myocarditis confirmed by CMR according to the Lake Louise criteria and 20 healthy controls were analyzed including global longitudinal strain (GLS) and left atrial (LA) strain parameters. Although preserved LVEF was present in both groups, GLS was significantly lower in patients with acute myocarditis (GLS - 19.1 ± 1.8% vs. GLS - 22.1 ± 1.7%, p < 0.001). Further diastolic dysfunction measured by E/e' mean was significantly deteriorated in the myocarditis group compared to the control group (E/e' mean 6.4 ± 1.6 vs. 5.5 ± 1.0, p = 0.038). LA reservoir function (47.6 ± 10.4% vs. 55.5 ± 10.8%, p = 0.013) and LA conduit function (-33.0 ± 9.6% vs. -39.4 ± 9.5%, p = 0.024) were significantly reduced in patients with acute myocarditis compared to healthy controls. Also left atrial stiffness index (0.15 ± 0.05 vs. 0.10 ± 0.03, p = 0.003) as well as left atrial filling index (1.67 ± 0.47 vs. 1.29 ± 0.34, p = 0.004) were deteriorated in patients with myocarditis compared to the control group. CONCLUSION In patients with acute myocarditis and preserved LVEF not only GLS but also LA reservoir function, LA conduit function and left atrial stiffness index as well as left atrial filling index were impaired compared to healthy controls indicating ventricular diastolic dysfunction and elevated LV filling pressures.
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Affiliation(s)
- Christine Meindl
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany.
| | - Michael Paulus
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Florian Poschenrieder
- Institute of Radiology, University Hospital Regensburg, Regensburg, Germany
- Department of Pneumology, Donaustauf Hospital, Donaustauf, Germany
| | - Okka W Hamer
- Institute of Radiology, University Hospital Regensburg, Regensburg, Germany
| | - Florian Zeman
- Center for Clinical Studies, University Hospital Regensburg, Regensburg, Germany
| | - Lars S Maier
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Kurt Debl
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
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Körtl T, Stehle T, Riedl D, Trausel J, Rebs S, Pabel S, Paulus M, Holzamer A, Marrouche N, Maier LS, Sohns C, Streckfuss-Bömeke K, Sossalla S. Atrial Fibrillation Burden Specifically Determines Human Ventricular Cellular Remodeling. JACC Clin Electrophysiol 2022; 8:1357-1366. [PMID: 36424002 DOI: 10.1016/j.jacep.2022.07.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Revised: 06/27/2022] [Accepted: 07/18/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Atrial fibrillation (AF) can either be a consequence or an underlying mechanism of left ventricular systolic dysfunction. Patients included in the CASTLE-AF (Catheter Ablation vs. Standard Conventional Treatment in Patients With LV Dysfunction and AF) trial who suffered from AF and left ventricular systolic dysfunction benefited from an AF burden <50% after catheter ablation compared with those patients with an AF burden >50%. OBJECTIVES This analysis tried to explain the clinical findings of the CASTLE-AF trial regarding AF burden in a "back-to-bench" approach. METHODS To study the ventricular effects of different AF burdens, experiments were performed using human ventricular induced pluripotent stem cell-derived cardiomyocytes undergoing in vitro AF simulation. Epifluorescence microscopy, action potential measurements, and measurements of sarcomere regularity were conducted. RESULTS Induced pluripotent stem cell-derived cardiomyocytes stimulated with AF burden of 60% or higher displayed typical hallmarks of heart failure. Ca2+ transient amplitude was significantly reduced indicating negative inotropic effects. Action potential duration was significantly prolonged, which represents a potential trigger for arrhythmias. A significant decrease of sarcomere regularity could explain impaired cardiac contractility in patients with high AF burden. These effects were more pronounced after 7 days of AF simulation compared with 48 hours. CONCLUSIONS Significant functional and structural alterations occurred at the cellular level at a threshold of ∼50% AF burden as it was observed to be harmful in the CASTLE-AF trial. Therefore, these translational results may help to understand the findings of the CASTLE-AF trial.
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Affiliation(s)
- Thomas Körtl
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Thea Stehle
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Dominic Riedl
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Johanna Trausel
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Sabine Rebs
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, Göttingen, Germany; German Center for Cardiovascular Research, partner site Göttingen, Göttingen, Germany; Institute of Pharmacology and Toxicology, University of Würzburg, Würzberg, Germany
| | - Steffen Pabel
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Michael Paulus
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Andreas Holzamer
- Department of Cardiothoracic Surgery, University of Regensburg Medical Center, Regensburg, Germany
| | - Nassir Marrouche
- Tulane Research and Innovation for Arrhythmia Discoveries Center, Tulane University School of Medicine, New Orleans, Louisiana, USA
| | - Lars S Maier
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Christian Sohns
- Clinic for Electrophysiology, Herz-und Diabeteszentrum NRW, Ruhr-Universität Bochum, Bad Zenhaeusern, Germany
| | - Katrin Streckfuss-Bömeke
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, Göttingen, Germany; German Center for Cardiovascular Research, partner site Göttingen, Göttingen, Germany; Institute of Pharmacology and Toxicology, University of Würzburg, Würzberg, Germany
| | - Samuel Sossalla
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany; Clinic for Cardiology and Pneumology, Georg-August University Göttingen, Göttingen, Germany; German Center for Cardiovascular Research, partner site Göttingen, Göttingen, Germany.
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10
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Surmeier G, Dogan-Surmeier S, Paulus M, Albers C, Latarius J, Sternemann C, Schneider E, Tolan M, Nase J. The interaction of viral fusion peptides with lipid membranes. Biophys J 2022; 121:3811-3825. [PMID: 36110043 PMCID: PMC9674987 DOI: 10.1016/j.bpj.2022.09.011] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 05/13/2022] [Accepted: 09/12/2022] [Indexed: 11/02/2022] Open
Abstract
In this paper, we studied fusogenic peptides of class I-III fusion proteins, which are relevant to membrane fusion for certain enveloped viruses, in contact with model lipid membranes. We resolved the vertical structure and examined the adsorption or penetration behavior of the fusogenic peptides at phospholipid Langmuir monolayers with different initial surface pressures with x-ray reflectometry. We show that the fusion loops of tick-borne encephalitis virus (TBEV) glycoprotein E and vesicular stomatitis virus (VSV) G-protein are not able to insert deeply into model lipid membranes, as they adsorbed mainly underneath the headgroups with only limited penetration depths into the lipid films. In contrast, we observed that the hemagglutinin 2 fusion peptide (HA2-FP) and the VSV-transmembrane domain (VSV-TMD) can penetrate deeply into the membranes. However, in the case of VSV-TMD, the penetration was suppressed already at low surface pressures, whereas HA2-FP was able to insert even into highly compressed films. Membrane fusion is accompanied by drastic changes of the membrane curvature. To investigate how the peptides affect the curvature of model lipid membranes, we examined the effect of the fusogenic peptides on the equilibration of cubic monoolein structures after a phase transition from a lamellar state induced by an abrupt hydrostatic pressure reduction. We monitored this process in presence and absence of the peptides with small-angle x-ray scattering and found that HA2-FP and VSV-TMD drastically accelerate the equilibration, while the fusion loops of TBEV and VSV stabilize the swollen state of the lipid structures. In this work, we show that the class I fusion peptide of HA2 penetrates deeply into the hydrophobic region of membranes and is able to promote and accelerate the formation of negative curvature. In contrast, we found that the class II and III fusion loops of TBEV and VSV tend to counteract negative membrane curvature.
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Affiliation(s)
- Göran Surmeier
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | | | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | - Christian Albers
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | - Jan Latarius
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | | | - Eric Schneider
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | - Metin Tolan
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
| | - Julia Nase
- Fakultät Physik/DELTA, Technische Universität Dortmund, Dortmund, Germany
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11
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Fisser C, Palmér O, Sallisalmi M, Paulus M, Foltan M, Philipp A, Malfertheiner MV, Lubnow M, Müller T, Broman LM. Corrigendum: Recirculation in single lumen cannula venovenous extracorporeal membrane oxygenation: A non-randomized bi-centric trial. Front Med (Lausanne) 2022; 9:1045207. [PMID: 36267622 PMCID: PMC9577499 DOI: 10.3389/fmed.2022.1045207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 09/16/2022] [Indexed: 12/01/2022] Open
Affiliation(s)
- Christoph Fisser
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany,*Correspondence: Christoph Fisser
| | - Oscar Palmér
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Marko Sallisalmi
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Michael Paulus
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Maik Foltan
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | - Alois Philipp
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | | | - Matthias Lubnow
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Thomas Müller
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Lars Mikael Broman
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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12
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Fisser C, Palmér O, Sallisalmi M, Paulus M, Foltan M, Philipp A, Malfertheiner MV, Lubnow M, Müller T, Broman LM. Recirculation in single lumen cannula venovenous extracorporeal membrane oxygenation: A non-randomized bi-centric trial. Front Med (Lausanne) 2022; 9:973240. [PMID: 36117961 PMCID: PMC9470851 DOI: 10.3389/fmed.2022.973240] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 08/16/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundRecirculation is a common problem in venovenous (VV) extracorporeal membrane oxygenation (ECMO). The aims of this study were to compare recirculation fraction (Rf) between femoro-jugular and jugulo-femoral VV ECMO configurations, to identify risk factors for recirculation and to assess the impact on hemolysis.MethodsPatients in the medical intensive care unit (ICU) at the University Medical Center Regensburg, Germany receiving VV ECMO with femoro-jugular, and jugulo-femoral configuration at the ECMO Center Karolinska, Sweden, were included in this non-randomized prospective study. Total ECMO flow (QEC), recirculated flow (QREC), and recirculation fraction Rf = QREC/QEC were determined using ultrasound dilution technology. Effective ECMO flow (QEFF) was defined as QEFF = QEC * (1–Rf). Demographics, cannula specifics, and markers of hemolysis were assessed. Survival was evaluated at discharge from ICU.ResultsThirty-seven patients with femoro-jugular configuration underwent 595 single-point measurements and 18 patients with jugulo-femoral configuration 231 measurements. Rf was lower with femoro-jugular compared to jugulo-femoral configuration [5 (0, 11) vs. 19 (13, 28) %, respectively (p < 0.001)], resulting in similar QEFF [2.80 (2.21, 3.39) vs. 2.79 (2.39, 3.08) L/min (p = 0.225)] despite lower QEC with femoro-jugular configuration compared to jugulo-femoral [3.01 (2.40, 3.70) vs. 3.57 (3.05, 4.06) L/min, respectively (p < 0.001)]. In multivariate regression analysis, the type of configuration, distance between the two cannula tips, ECMO flow, and heart rate were significantly associated with Rf [B (95% CI): 25.8 (17.6, 33.8), p < 0.001; 960.4 (960.7, 960.1), p = 0.009; 4.2 (2.5, 5.9), p < 0.001; 960.1 (960.2, 0.0), p = 0.027]. Hemolysis was similar in subjects with Rf > 8 vs. ≤ 8%. Explorative data on survival showed comparable results in the femoro-jugular and the jugulo-femoral group (81 vs. 72%, p = 0.455).ConclusionVV ECMO with femoro-jugular configuration caused less recirculation. Further risk factors for higher Rf were shorter distance between the two cannula tips, higher ECMO flow, and lower heart rate. Rf did not affect hemolysis.
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Affiliation(s)
- Christoph Fisser
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
- *Correspondence: Christoph Fisser
| | - Oscar Palmér
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Marko Sallisalmi
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Michael Paulus
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Maik Foltan
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | - Alois Philipp
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | | | - Matthias Lubnow
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Thomas Müller
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Lars Mikael Broman
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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13
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Dogan S, Paulus M, Kosfeld BR, Cewe C, Tolan M. Interaction of Human Resistin with Human Islet Amyloid Polypeptide at Charged Phospholipid Membranes. ACS Omega 2022; 7:22377-22382. [PMID: 35811869 PMCID: PMC9260898 DOI: 10.1021/acsomega.2c01363] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
An X-ray reflectivity study on the interaction of recombinant human resistin (hRes) with fibrillation-prone human islet amyloid polypeptide (hIAPP) at anionic phospholipid Langmuir films as model membranes is presented. Aggregation and amyloid formation of hIAPP is considered the main mechanism of pancreatic β-cell loss in patients with type 2 diabetes mellitus. Resistin shows a chaperone-like ability, but also tends to form aggregates by itself. Resistin and hIAPP cross multiply metabolism pathways. In this study, we researched the potential protective effects of resistin against hIAPP-induced lipid membrane rupture. The results demonstrate that resistin can inhibit or prevent hIAPP adsorption even in the presence of aggregation-promoting negatively charged lipid interfaces. Moreover, we found strong hydrophobic interactions of resistin at the bare buffer-air interface.
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14
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Moron M, Al-Masoodi A, Lovato C, Reiser M, Randolph L, Surmeier G, Bolle J, Westermeier F, Sprung M, Winter R, Paulus M, Gutt C. Gelation Dynamics upon Pressure-Induced Liquid-Liquid Phase Separation in a Water-Lysozyme Solution. J Phys Chem B 2022; 126:4160-4167. [PMID: 35594491 DOI: 10.1021/acs.jpcb.2c01947] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Employing X-ray photon correlation spectroscopy, we measure the kinetics and dynamics of a pressure-induced liquid-liquid phase separation (LLPS) in a water-lysozyme solution. Scattering invariants and kinetic information provide evidence that the system reaches the phase boundary upon pressure-induced LLPS with no sign of arrest. The coarsening slows down with increasing quench depths. The g2 functions display a two-step decay with a gradually increasing nonergodicity parameter typical for gelation. We observe fast superdiffusive (γ ≥ 3/2) and slow subdiffusive (γ < 0.6) motion associated with fast viscoelastic fluctuations of the network and a slow viscous coarsening process, respectively. The dynamics age linearly with time τ ∝ tw, and we observe the onset of viscoelastic relaxation for deeper quenches. Our results suggest that the protein solution gels upon reaching the phase boundary.
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Affiliation(s)
- M Moron
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - A Al-Masoodi
- Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
| | - C Lovato
- Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
| | - M Reiser
- Department of Physics, Stockholm University, 10691 Stockholm, Sweden
| | - L Randolph
- Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
| | - G Surmeier
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - J Bolle
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - F Westermeier
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - M Sprung
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - R Winter
- Fakultät Chemie und Chemische Biologie, Physikalische Chemie, TU Dortmund, 44227 Dortmund, Germany
| | - M Paulus
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - C Gutt
- Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, 57068 Siegen, Germany
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15
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Dogan S, Paulus M, Surmeier G, Foryt K, Brägelmann K, Tolan M. Nondestructive Compression and Fluidization of Phospholipid Monolayers by Gaseous and Aerolized Perfluorocarbons: Promising Substances for Lung Surfactant Treatment. Langmuir 2022; 38:6690-6699. [PMID: 35588471 DOI: 10.1021/acs.langmuir.2c00617] [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: 06/15/2023]
Abstract
We present a surface-sensitive X-ray scattering study on the influence of gaseous and aerolized perfluorocarbons (FCs) on zwitterionic and anionic phospholipid Langmuir films, which serve as a simplified model system of lung surfactants. It was found that small gaseous FC molecules like F-propane and F-butane penetrate phospholipid monolayers and accumulate between the alkyl chains and form islands. This clustering process can trigger the formation of lipid crystallites at low initial surface pressures. In contrast, the large linear FC F-octyl bromide fluidizes membranes, causing a dissolution of crystalline domains. The bicyclic FC F-decalin accumulates between the alkyl chains of 1,2-dipalmitoyl phosphatidylcholine but cannot penetrate the more densely packed 1,2-dipalmitoyl phosphatidic acid films because of its size. The effects of FCs on lung surfactants are discussed in the framework of currently proposed therapeutic methods for acute respiratory distress syndrome using FC gases, vapor, or aerosol ventilation causing monolayer fluidization effects. This study implies that the highly biocompatible and nontoxic FCs could be beneficial in the treatment of lung diseases with injured nonfunctional lung surfactants in a novel approach for ventilation.
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Affiliation(s)
- Susanne Dogan
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - Göran Surmeier
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - Kevin Foryt
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | | | - Metin Tolan
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
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16
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Pabel S, Knierim M, Stehle T, Alebrand F, Paulus M, Sieme M, Herwig M, Barsch F, Körtl T, Pöppl A, Wenner B, Ljubojevic-Holzer S, Molina CE, Dybkova N, Camboni D, Fischer TH, Sedej S, Scherr D, Schmid C, Brochhausen C, Hasenfuß G, Maier LS, Hamdani N, Streckfuss-Bömeke K, Sossalla S. Effects of Atrial Fibrillation on the Human Ventricle. Circ Res 2022; 130:994-1010. [PMID: 35193397 PMCID: PMC8963444 DOI: 10.1161/circresaha.121.319718] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 02/08/2022] [Accepted: 02/14/2022] [Indexed: 11/16/2022]
Abstract
RATIONALE Atrial fibrillation (AF) and heart failure often coexist, but their interaction is poorly understood. Clinical data indicate that the arrhythmic component of AF may contribute to left ventricular (LV) dysfunction. OBJECTIVE This study investigates the effects and molecular mechanisms of AF on the human LV. METHODS AND RESULTS Ventricular myocardium from patients with aortic stenosis and preserved LV function with sinus rhythm or rate-controlled AF was studied. LV myocardium from patients with sinus rhythm and patients with AF showed no differences in fibrosis. In functional studies, systolic Ca2+ transient amplitude of LV cardiomyocytes was reduced in patients with AF, while diastolic Ca2+ levels and Ca2+ transient kinetics were not statistically different. These results were confirmed in LV cardiomyocytes from nonfailing donors with sinus rhythm or AF. Moreover, normofrequent AF was simulated in vitro using arrhythmic or rhythmic pacing (both at 60 bpm). After 24 hours of AF-simulation, human LV cardiomyocytes from nonfailing donors showed an impaired Ca2+ transient amplitude. For a standardized investigation of AF-simulation, human iPSC-cardiomyocytes were tested. Seven days of AF-simulation caused reduced systolic Ca2+ transient amplitude and sarcoplasmic reticulum Ca2+ load likely because of an increased diastolic sarcoplasmic reticulum Ca2+ leak. Moreover, cytosolic Na+ concentration was elevated and action potential duration was prolonged after AF-simulation. We detected an increased late Na+ current as a potential trigger for the detrimentally altered Ca2+/Na+-interplay. Mechanistically, reactive oxygen species were higher in the LV of patients with AF. CaMKII (Ca2+/calmodulin-dependent protein kinase IIδc) was found to be more oxidized at Met281/282 in the LV of patients with AF leading to an increased CaMKII activity and consequent increased RyR2 phosphorylation. CaMKII inhibition and ROS scavenging ameliorated impaired systolic Ca2+ handling after AF-simulation. CONCLUSIONS AF causes distinct functional and molecular remodeling of the human LV. This translational study provides the first mechanistic characterization and the potential negative impact of AF in the absence of tachycardia on the human ventricle.
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Affiliation(s)
- Steffen Pabel
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Maria Knierim
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
| | - Thea Stehle
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Felix Alebrand
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
| | - Michael Paulus
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Marcel Sieme
- Institut für Forschung und Lehre (IFL), Department of Molecular and Experimental Cardiology and Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, Germany (M.S., M.H., N.H.)
| | - Melissa Herwig
- Institut für Forschung und Lehre (IFL), Department of Molecular and Experimental Cardiology and Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, Germany (M.S., M.H., N.H.)
| | - Friedrich Barsch
- Institute of Pathology, University Hospital Regensburg, Germany (F.B., C.B.)
| | - Thomas Körtl
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Arnold Pöppl
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Brisca Wenner
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
| | | | - Cristina E. Molina
- Institute of Experimental Cardiovascular Research, University Medical Centre Hamburg-Eppendorf, Germany (C.E.M.)
| | - Nataliya Dybkova
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
| | - Daniele Camboni
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Germany (D.C., C.S.)
| | - Thomas H. Fischer
- Department of Internal Medicine I, University of Würzburg, Germany (T.H.F.)
| | - Simon Sedej
- Department of Cardiology, Medical University of Graz, Austria (S.L.-H., S. Sedej, D.S.)
- Faculty of Medicine, University of Maribor, Maribor, Slovenia (S. Sedej)
- BioTechMed Graz, Graz, Austria (S. Sedej)
| | - Daniel Scherr
- Department of Cardiology, Medical University of Graz, Austria (S.L.-H., S. Sedej, D.S.)
| | - Christof Schmid
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Germany (D.C., C.S.)
| | | | - Gerd Hasenfuß
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
| | - Lars S. Maier
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
| | - Nazha Hamdani
- Institut für Forschung und Lehre (IFL), Department of Molecular and Experimental Cardiology and Department of Cardiology, St. Josef-Hospital, Ruhr University Bochum, Germany (M.S., M.H., N.H.)
| | - Katrin Streckfuss-Bömeke
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
- Institute of Pharmacology and Toxicology, University of Würzburg, Germany (K.S.-B.)
| | - Samuel Sossalla
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany (S.P., M.K., T.S., M.P., T.K., A.P., L.S.M., S. Sossalla)
- Clinic for Cardiology and Pneumology, Georg-August University Göttingen, and DZHK (German Centre for Cardiovascular Research), partner site Göttingen, Germany (M.K., F.A., B.W., N.D., G.H., K.S.-B., S. Sossalla)
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17
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Surmeier G, Paulus M, Schneider E, Dogan S, Tolan M, Nase J. A pressure-jump study on the interaction of osmolytes and crowders with cubic monoolein structures. Soft Matter 2022; 18:990-998. [PMID: 35015016 DOI: 10.1039/d1sm01425k] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Many vital processes that take place in biological cells involve remodeling of lipid membranes. These processes take place in a milieu that is packed with various solutes, ranging from ions and small organic osmolytes to proteins and other macromolecules, occupying about 30% of the available volume. In this work, we investigated how molecular crowding, simulated with the polymer polyethylene glycol (PEG), and the osmolytes urea and trimethylamine-N-oxide (TMAO) affect the equilibration of cubic monoolein structures after a phase transition from a lamellar state induced by an abrupt pressure reduction. In absence of additives, swollen cubic crystallites form after the transition, releasing excess water over several hours. This process is reflected in a decreasing lattice constant and was monitored with small angle X-ray scattering. We found that the osmotic pressure exerted by PEG and TMAO, which are displaced from narrow inter-bilayer spaces, accelerates the equilibration. When the radius of gyration of the added PEG was smaller than the radius of the water channels of the cubic phase, the effect became more pronounced with increasing molecular weight of the polymers. As the release of hydration water from the cubic structures is accompanied by an increasing membrane curvature and a reduction of the interface between lipids and aqueous phase, urea, which has a slight affinity to reside near membrane surfaces, stabilized the swollen crystallites and slowed down the equilibration dynamics. Our results support the view that cellular solutes are important contributors to dynamic membrane processes, as they can accelerate dehydration of inter-bilayer spaces and promote or counteract membrane curvature.
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Affiliation(s)
- Göran Surmeier
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
| | - Eric Schneider
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
| | - Susanne Dogan
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
| | - Metin Tolan
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
| | - Julia Nase
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
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18
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Siska PJ, Decking SM, Babl N, Matos C, Bruss C, Singer K, Klitzke J, Schön M, Simeth J, Köstler J, Siegmund H, Ugele I, Paulus M, Dietl A, Kolodova K, Steines L, Freitag K, Peuker A, Schönhammer G, Raithel J, Graf B, Geismann F, Lubnow M, Mack M, Hau P, Bohr C, Burkhardt R, Gessner A, Salzberger B, Wagner R, Hanses F, Hitzenbichler F, Heudobler D, Lüke F, Pukrop T, Herr W, Wolff D, Spang R, Poeck H, Hoffmann P, Jantsch J, Brochhausen C, Lunz D, Rehli M, Kreutz M, Renner K. Metabolic imbalance of T cells in COVID-19 is hallmarked by basigin and mitigated by dexamethasone. J Clin Invest 2021; 131:148225. [PMID: 34779418 DOI: 10.1172/jci148225] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [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: 02/01/2021] [Accepted: 09/28/2021] [Indexed: 12/15/2022] Open
Abstract
Metabolic pathways regulate immune responses and disrupted metabolism leads to immune dysfunction and disease. Coronavirus disease 2019 (COVID-19) is driven by imbalanced immune responses, yet the role of immunometabolism in COVID-19 pathogenesis remains unclear. By investigating 87 patients with confirmed SARS-CoV-2 infection, 6 critically ill non-COVID-19 patients, and 47 uninfected controls, we found an immunometabolic dysregulation in patients with progressed COVID-19. Specifically, T cells, monocytes, and granulocytes exhibited increased mitochondrial mass, yet only T cells accumulated intracellular reactive oxygen species (ROS), were metabolically quiescent, and showed a disrupted mitochondrial architecture. During recovery, T cell ROS decreased to match the uninfected controls. Transcriptionally, T cells from severe/critical COVID-19 patients showed an induction of ROS-responsive genes as well as genes related to mitochondrial function and the basigin network. Basigin (CD147) ligands cyclophilin A and the SARS-CoV-2 spike protein triggered ROS production in T cells in vitro. In line with this, only PCR-positive patients showed increased ROS levels. Dexamethasone treatment resulted in a downregulation of ROS in vitro and T cells from dexamethasone-treated patients exhibited low ROS and basigin levels. This was reflected by changes in the transcriptional landscape. Our findings provide evidence of an immunometabolic dysregulation in COVID-19 that can be mitigated by dexamethasone treatment.
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Affiliation(s)
- Peter J Siska
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Sonja-Maria Decking
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | - Nathalie Babl
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Carina Matos
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Christina Bruss
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Katrin Singer
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Department of Otorhinolaryngology, University Hospital Regensburg, Regensburg
| | - Jana Klitzke
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Marian Schön
- Department of Statistical Bioinformatics, Institute of Functional Genomics, University of Regensburg, Regensburg, Germany
| | - Jakob Simeth
- Department of Statistical Bioinformatics, Institute of Functional Genomics, University of Regensburg, Regensburg, Germany
| | - Josef Köstler
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | - Heiko Siegmund
- Institute of Pathology, University of Regensburg, Regensburg, Germany.,Central Biobank Regensburg, University Hospital and University of Regensburg, Regensburg, Germany
| | - Ines Ugele
- Department of Otorhinolaryngology, University Hospital Regensburg, Regensburg
| | | | | | - Kristina Kolodova
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | | | - Katharina Freitag
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Alice Peuker
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Gabriele Schönhammer
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Johanna Raithel
- Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | | | | | | | | | - Peter Hau
- Wilhelm Sander-NeuroOncology Unit and Department of Neurology
| | - Christopher Bohr
- Department of Otorhinolaryngology, University Hospital Regensburg, Regensburg
| | | | - Andre Gessner
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | | | - Ralf Wagner
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | - Frank Hanses
- Department of Infection Prevention and Infectious Diseases, and.,Emergency Department, University Hospital Regensburg, Regensburg, Germany
| | | | - Daniel Heudobler
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Bavarian Cancer Research Center, Regensburg, Germany
| | - Florian Lüke
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Tobias Pukrop
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Bavarian Cancer Research Center, Regensburg, Germany
| | - Wolfgang Herr
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Daniel Wolff
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | - Rainer Spang
- Department of Statistical Bioinformatics, Institute of Functional Genomics, University of Regensburg, Regensburg, Germany
| | - Hendrik Poeck
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany
| | - Petra Hoffmann
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | - Jonathan Jantsch
- Institute of Clinical Microbiology and Hygiene, University Hospital Regensburg, Regensburg, Germany
| | - Christoph Brochhausen
- Institute of Pathology, University of Regensburg, Regensburg, Germany.,Central Biobank Regensburg, University Hospital and University of Regensburg, Regensburg, Germany
| | | | - Michael Rehli
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | - Marina Kreutz
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
| | - Kathrin Renner
- Department of Internal Medicine III, University Hospital Regensburg, Regensburg, Germany.,Regensburg Center for Interventional Immunology, University of Regensburg, Regensburg, Germany
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19
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Bolle J, Bierwirth SP, Požar M, Perera A, Paulus M, Münzner P, Albers C, Dogan S, Elbers M, Sakrowski R, Surmeier G, Böhmer R, Tolan M, Sternemann C. Isomeric effects in structure formation and dielectric dynamics of different octanols. Phys Chem Chem Phys 2021; 23:24211-24221. [PMID: 34693949 DOI: 10.1039/d1cp02468j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The understanding of the microstructure of associated liquids promoted by hydrogen-bonding and constrained by steric hindrance is highly relevant in chemistry, physics, biology and for many aspects of daily life. In this study we use a combination of X-ray diffraction, dielectric spectroscopy and molecular dynamics simulations to reveal temperature induced changes in the microstructure of different octanol isomers, i.e., linear 1-octanol and branched 2-, 3- and 4-octanol. In all octanols, the hydroxyl groups form the basis of chain-, cyclic- or loop-like bonded structures that are separated by outwardly directed alkyl chains. This clustering is analyzed through the scattering pre-peaks observed from X-ray scattering and simulations. The charge ordering which pilots OH aggregation can be linked to the strength of the Debye process observed in dielectric spectroscopy. Interestingly, all methods used here converge to the same interpretation: as one moves from 1-octanol to the branched octanols, the cluster structure evolves from loose large aggregates to a larger number of smaller, tighter aggregates. All alcohols exhibit a peculiar temperature dependence of both the pre-peak and Debye process, which can be understood as a change in microstructure promoted by chain association with increased chain length possibly assisted by ring-opening effects. All these results tend to support the intuitive picture of the entropic constraint provided by branching through the alkyl tails and highlight its capital entropic role in supramolecular assembly.
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Affiliation(s)
- Jennifer Bolle
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - S Peter Bierwirth
- Fakultät Physik, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Martina Požar
- University of Split, Faculty of Science, Ruera Boškovića 33, 21000, Split, Croatia
| | - Aurélien Perera
- Sorbonne Université, Laboratoire de Physique Théorique de la Matiére Condensée (UMR CNRS 7600), 4 Place Jussieu, F75252, Paris cedex 05, France
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Philipp Münzner
- Fakultät Physik, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Christian Albers
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Susanne Dogan
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Mirko Elbers
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Robin Sakrowski
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Göran Surmeier
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Roland Böhmer
- Fakultät Physik, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Metin Tolan
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Christian Sternemann
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany.
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20
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Pabel S, Knierim M, Stehle T, Alebrand F, Paulus M, Sieme M, Herwig M, Sedej S, Scherr D, Brochhausen C, Hasenfuss G, Maier L, Hamdani N, Streckfuss-Boemeke K, Sossalla S. Effects of atrial fibrillation on ventricular remodeling in the human heart. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3216] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Atrial fibrillation (AF) is often found in patients with heart failure (HF). Clinical data indicated that the arrhythmic component of AF alone could contribute to left-ventricular (LV) dysfunction. However, the effects of non-tachycardic AF with arrhythmic excitation of the human LV, are unknown.
We investigated human LV myocardium from patients with sinus rhythm (SR) or normofrequent AF (mean EF>50%, matched clinical data, derived from septal resections during AVR). In histological analysis we detected no difference between SR (n=17 patients) and AF patients (n=18) regarding the amount and distribution of fibrosis. We isolated human LV cardiomyocytes (CM) and studied cellular Ca-handling (Fura-2). Systolic Ca-transient amplitude of LV CM was reduced in patients suffering from AF (n=8 AF patients vs. 11 SR), while diastolic Ca-levels and Ca-transient kinetics were not significantly changed. These results were confirmed in LV CM from non-failing donors (NF) with AF (n=4 AF patients vs. 8 SR). For the standardized investigation of a normofrequent arrhythmia, we simulated AF in vitro by using arrhythmic (60 bpm, 40% beat-to-beat variability) or rhythmic (60 bpm) field stimulation. Human LV CM from NF SR patients (n=8) showed an impaired Ca-transient amplitude after 24h arrhythmic culture pacing without changes in diastolic Ca and Ca-transient kinetics. For studying a model suitable for more standardized chronic pacing, we utilized human iPSC cardiomyocytes (iPSC-CM) from healthy donors (n=6). After 7 days, arrhythmically paced iPSC-CM exhibited a reduced systolic Ca-transient amplitude, a trend towards a prolonged Ca-elimination time and a reduced sarcoplasmic reticulum Ca-load. Confocal line-scans of arrhythmically paced cells (Fluo-4 AM) showed an increased diastolic Ca-leak from the sarcoplasmic reticulum, possibly underlying the reduced Ca-load. Coupled with the Ca changes, cytosolic Na was elevated after arrhythmia. We found an increased late INa, which could explain the detrimentally altered Ca/Na-interplay. Accordingly, Patch-clamp experiments revealed a prolonged action potential duration after arrhythmia. We further elucidated the underlying mechanisms of this electrophysiological remodeling by showing that oxidative stress (H2O2, LPO) is increased in the LV of patients suffering from AF (n=6 AF patients vs. 6 SR), which was associated with an enhanced NOX2/-4 activity. Consecutively, Ca2+/calmodulin-dependent protein kinase IIδ (CaMKII) was found to be more oxidized (CaMKII-Met281/282) in the LV of AF patients (n=7 AF patients vs. 7 SR) leading to an increased CaMKII activity, which adversely regulated EC-coupling protein phosphorylation including RyR2 hyperphosphorylation.
Normofrequent arrhythmia/AF impairs human ventricular EC-coupling via increased oxidative stress and enhanced CaMKII. Thus, this translational study provides the first mechanistic characterization and the potential negative impact of isolated AF on the human LV.
Funding Acknowledgement
Type of funding sources: Public Institution(s). Main funding source(s): Else Kröner-Fresenius-Stiftung (EKFS) and Deutsche Gesellschaft für Innere Medizin
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Affiliation(s)
- S Pabel
- University hospital Regensburg, Regensburg, Germany
| | - M Knierim
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - T Stehle
- University hospital Regensburg, Regensburg, Germany
| | - F Alebrand
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - M Paulus
- University hospital Regensburg, Regensburg, Germany
| | - M Sieme
- Ruhr University Bochum, Department of Molecular and Experimental Cardiology, Bochum, Germany
| | - M Herwig
- Ruhr University Bochum, Department of Molecular and Experimental Cardiology, Bochum, Germany
| | - S Sedej
- University Hospital Graz, Department of Cardiology, Graz, Austria
| | - D Scherr
- University Hospital Graz, Department of Cardiology, Graz, Austria
| | - C Brochhausen
- University of Regensburg, Institute of Pathology, Regensburg, Germany
| | - G Hasenfuss
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - L Maier
- University hospital Regensburg, Regensburg, Germany
| | - N Hamdani
- Ruhr University Bochum, Department of Molecular and Experimental Cardiology, Bochum, Germany
| | - K Streckfuss-Boemeke
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - S Sossalla
- University hospital Regensburg, Regensburg, Germany
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21
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Meindl C, Paulus M, Poschenrieder F, Zeman F, Maier LS, Debl K. Patients with acute myocarditis and preserved systolic left ventricular function: comparison of global and regional longitudinal strain imaging by echocardiography with quantification of late gadolinium enhancement by CMR. Clin Res Cardiol 2021; 110:1792-1800. [PMID: 34086089 PMCID: PMC8563632 DOI: 10.1007/s00392-021-01885-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/27/2021] [Indexed: 12/16/2022]
Abstract
Background Conventional transthoracic echocardiography (TTE) does often not accurately reveal pathologies in patients with acute myocarditis and preserved left ventricular ejection fraction (LVEEF). Therefore, we investigated the diagnostic value of two-dimensional (2D) speckle tracking echocardiography compared to late gadolinium enhancement (LGE) by cardiac magnetic resonance (CMR) imaging in patients with acute myocarditis and normal global LVEF. Methods and results 31 patients (group 1) with the diagnosis of acute myocarditis confirmed by CMR according to the Lake Louise criteria and 20 healthy controls (group 2) were analyzed including global longitudinal strain (GLS) and regional longitudinal strain (RLS) derived by the bull’s eye plot. Although preserved LVEF was present in both groups, GLS was significantly lower in patients with acute myocarditis (group 1: GLS − 19.1 ± 1.8% vs. group 2: GLS − 22.1 ± 1.7%, p < 0.001). Compared to controls, lower RLS values were detected predominantly in the lateral, inferolateral, and inferior segments in patients with acute myocarditis. Additionally RLS values were significantly lower in segments without LGE. Conclusion In patients with acute myocarditis and preserved LVEF, a significant reduction of GLS compared to healthy subjects was detected. Further RLS adds important information to the localization and extent of myocardial injury. Graphic abstract ![]()
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Affiliation(s)
- Christine Meindl
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany.
| | - Michael Paulus
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
| | | | - Florian Zeman
- Center for Clinical Studies, University Hospital Regensburg, Regensburg, Germany
| | - Lars S Maier
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
| | - Kurt Debl
- Department of Internal Medicine II, University Hospital Regensburg, 93053, Regensburg, Germany
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22
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Meindl C, Paulus M, Koller T, Rogalski D, Hamerle M, Schach C, Buchner S, Zeman F, Maier LS, Debl K, Unsöld B, Birner C. Acquired von Willebrand syndrome and factor VIII in patients with moderate to severe mitral regurgitation undergoing transcatheter mitral valve repair. Clin Cardiol 2020; 44:261-266. [PMID: 33372698 PMCID: PMC7852171 DOI: 10.1002/clc.23538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 12/05/2020] [Accepted: 12/17/2020] [Indexed: 01/08/2023] Open
Abstract
Background and Hypothesis The acquired von Willebrand syndrome (AvWS), which predisposes to bleeding events, is often related to valvular heart diseases. We investigated possible implications of AvWS and factor VIII levels in patients with moderate to severe mitral regurgitation (MR) undergoing transcatheter mitral valve repair (TMVR). Methods and Results 123 patients with moderate to severe MR were prospectively enrolled. Complete measurements of von Willebrand Factor activity (vWFAct), von Willebrand Factor antigen (vWFAg), and factor VIII expression before and 4 weeks after TMVR were available in 85 patients. At baseline, seven patients had a history of gastrointestinal bleeding, two patients suffered bleeding events during their hospital stay, and one patient had a bleeding 4 weeks after TMVR. Even though vWFAct, vWFAct/vWFAg ratio and vWFAg values did not change after TMVR, we observed a significantly lower vWFAct/vWFAg ratio in patients with primary MR as compared to patients with secondary MR both at baseline (p = 0.022) and 4 weeks following the TMVR procedure (p = 0.003). Additionally, patients with a mean mitral valve gradient ≥4 mmHg after TMVR had significantly lower vWFAct/vWFAg ratios as compared to patients with a mean mitral valve gradient <4 mmHg (p = 0.001). Conclusions MR of primary etiology was associated with lower vWFAct/vWFAg ratio, hinting toward HMWM loss due to shear stress caused by eccentric regurgitation jets. In addition, morphological changes leading to postprocedural transmitral gradients ≥4 mmHg were related to lower vWFAct/vWFAg ratio 4 weeks after the procedure. Alterations of the vWFAct/vWFAg ratio in turn did not translate into a greater risk for bleeding events.
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Affiliation(s)
- Christine Meindl
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Michael Paulus
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Theresia Koller
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Dominik Rogalski
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Michael Hamerle
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Christian Schach
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Stefan Buchner
- Department of Internal Medicine II, Sana Hospital Cham, Cham, Germany
| | - Florian Zeman
- Center for Clinical Studies, University Hospital Regensburg, Regensburg, Germany
| | - Lars S Maier
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Kurt Debl
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Bernhard Unsöld
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Christoph Birner
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany.,Department of Internal Medicine I, St. Marien Hospital Amberg, Amberg, Germany
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23
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Pabel S, Knierim M, Alebrand F, Paulus M, Herting J, Hollemann D, Sedej S, Von Lewinski D, Fischer T, Schmid C, Hasenfuss G, Brochhausen C, Maier L, Streckfuss-Boemeke K, Sossalla S. Atrial fibrillation impairs ventricular function by altering excitation-contraction coupling in the human heart. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3711] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Atrial fibrillation (AF) often co-exists in patients with heart failure (HF). Recent clinical evidence suggests that the arrhythmic component of AF alone may contribute to ventricular dysfunction. However, the pathophysiological effects of a non-tachycardic AF on the human ventricle are unknown. To investigate the effects of normofrequent AF on the human ventricle we investigated ventricular myocardium from patients with preserved ejection fraction with sinus rhythm (SR) or AF in the absence of HF (compensated hypertrophy, EF>50%, matched clinical characteristics). In histological analysis we detected no difference between SR (n=9) vs. AF (n=6) regarding the amount and distribution of fibrosis. For functional investigation, Ca-handling was studied (Fura-2 AM). While systolic Ca-transient amplitude was in trend reduced in isolated human ventricular AF cardiomyocytes, we found a significantly prolonged Ca-elimination time (n=17–22 cells/4 pat.). Using caffeine application, a decreased SR Ca-load in AF was detected, which may be explained by a significant decrease in SERCA2a activity (ksys-kCaff, n=10–12/4 pat.). Patch-clamp experiments revealed a prolonged action potential duration in AF cardiomyocytes (n=5/15 cells).
For the standardized evaluation of the mechanisms of persistent normofrequent arrhythmia, we simulated AF in vitro by using arrhythmic (1 Hz, 40% R-R-variability) or rhythmic (1 Hz) field stimulation. We performed contractility experiments using in-toto isolated human ventricular trabeculae from explanted human hearts. After 8h of pacing, arrhythmically stimulated human trabeculae showed a significantly reduced systolic force, an increase in diastolic tension and a prolonged relaxation (n=11–12 trabeculae/11 pat.). For studying the cellular effects of persistent normofrequent arrhythmia in a model suitable for chronic pacing (up to 7 days), we utilized human iPSC cardiomyocytes (iPSC-CM) from healthy donors (n=6). After 7 days, arrhythmic paced iPSC-CM showed a significantly reduced systolic Ca-transient amplitude, a prolonged Ca-elimination time (n=35/45 cells) as well as a reduced SR Ca-load and a trend towards a lower SERCA2a activity compared to control (n=11 cells). Confocal line-scans (Fluo-4 AM) showed an increased diastolic SR Ca-release, which might also explain the reduced SR Ca-content (n=45/35 cells). Moreover, in irregularly paced iPSC-CM we found significant increased levels of cytosolic Na (n=69 cells each) and in patch-clamp experiments a significantly prolonged action potential duration (n=14/11 cells/3 diff.).
This study demonstrates that a normofrequent arrhythmic ventricular excitation as it occurs in AF impairs human ventricular myocardial function by altering cardiomyocyte excitation-contraction coupling. Thus, this study provides the first translational mechanistic characterization and the potential negative impact of isolated AF in the absence of tachycardia on the human ventricle.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- S Pabel
- University hospital Regensburg, Regensburg, Germany
| | - M Knierim
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - F Alebrand
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - M Paulus
- University hospital Regensburg, Regensburg, Germany
| | - J Herting
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - D Hollemann
- University of Regensburg, Institute of Pathology, Regensburg, Germany
| | - S Sedej
- Medical University of Graz, Department of Cardiology, Graz, Austria
| | - D Von Lewinski
- Medical University of Graz, Department of Cardiology, Graz, Austria
| | - T Fischer
- University Hospital Wuerzburg, Wuerzburg, Germany
| | - C Schmid
- University hospital Regensburg, Regensburg, Germany
| | - G Hasenfuss
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - C Brochhausen
- University of Regensburg, Institute of Pathology, Regensburg, Germany
| | - L Maier
- University hospital Regensburg, Regensburg, Germany
| | - K Streckfuss-Boemeke
- University Medical Center Gottingen (UMG), Dept. of Cardiology and Pneumology, Heart Center, Gottingen, Germany
| | - S Sossalla
- University hospital Regensburg, Regensburg, Germany
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Abstract
Abstract
Background
Chronic subclinical intravascular hemolysis is a common complication after valve replacement associated with worse prognosis, occurring in up to 80% of patients after mitral valve surgery. While serious intravascular hemolysis after MitraClip implantation has been reported anecdotally, data on the impact of transcatheter mitral valve repair on the prevalence of subclinical hemolysis are lacking.
Methods and results
From August 2017 to November 2019, 77 patients with high perioperative risk and moderate-to-severe or severe mitral regurgitation were prospectively enrolled in a single-center trial. All participants were treated with transcatheter edge-to-edge mitral valve repair using the MitraClip NT, NTR or XTR system. Before and three months after the procedure, all patients underwent comprehensive clinical assessment including laboratory measurement of hemoglobin, haptoglobin and lactic acid dehydrogenase in venous blood samples. Presence of subclinical intravascular hemolysis was defined as hemoglobin <13.8 g/dl for males or <12.4 g/dl for females, haptoglobin <65 mg/dl and lactic acid dehydrogenase >250 U/l. Levels of the hemolysis marker haptoglobin significantly decreased three months after the intervention (127±71 mg/dl at three months vs. 158±73 mg/dl at baseline, p<0.001), accompanied by an increase in lactic acid dehydrogenase (251±88 U/l vs. 222±55 U/l, p<0.01), implying the induction of intravascular hemolysis by transcatheter mitral valve repair. Higher residual mitral regurgitation was associated with lower haptoglobin levels three months after mitral valve repair (p<0.05), hinting that shear stress caused by regurgitation flow is the primary mechanism for hemolysis after MitraClip implantation. Concurrently, we observed a trend towards an increase in the presence of subclinical intravascular hemolysis (9.1% at three months vs. 3.9% at baseline, p=0.289). Hemoglobin levels remained unchanged (12.1±1.5 g/dl at three months vs 12.3±1.8 g/dl at baseline, p=0.107). No patient needed treatment for intravascular hemolysis.
Conclusion
Transcatheter edge-to-edge mitral valve repair in a high-risk collective is associated with the induction of hemolysis. Yet, prevalence of subclinical intravascular hemolysis is low when compared to mitral valve surgery, emphasizing the good safety profile of minimal-invasive mitral valve therapy.
Funding Acknowledgement
Type of funding source: Public Institution(s). Main funding source(s): ReForM-B research grant, University of Regensburg
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Affiliation(s)
- M Paulus
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - C Meindl
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - M Hamerle
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - C Schach
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - L.S Maier
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - C Birner
- Klinikum St. Marien, Department of Internal Medicine I, Amberg, Germany
| | - K Debl
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
| | - B Unsoeld
- University hospital Regensburg, Department of Internal Medicine II, Regensburg, Germany
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25
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Knierim M, Pabel S, Paulus M, Rainer P, Scherr D, Hasenfuss G, Maier L, Streckfuss-Boemeke K, Sossalla S. Cellular mechanisms of early tachycardia-induced ventricular dysfunction in the human heart. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3680] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Tachycardia-induced cardiomyopathy (TCM) is a reversible form of ventricular dysfunction caused by persistent tachycardia. Characterization of TCM is mainly based on artificially RV paced animal models. Moreover, the underlying mechanisms and time course from compensation to failure remain unclear. This study aimed to investigate early cellular remodeling of tachycardia-induced myocardial dysfunction in human myocardium.
Methods and results
To elucidate early cellular electrophysiological targets mediating the transition to TCM, we chronically paced (120bpm vs 60bpm control) human induced pluripotent stem cell cardiomyocytes (hiPS-CM) for up to 7d. As a major substrate of cellular myocardial dysfunction, we investigated the influence of chronic tachycardia on cellular Ca cycling. After 24h of persistent tachycardia we detected a significant decrease in Ca transient (CaT) amplitude and reduced diastolic Ca levels (Fura-2). Meanwhile, Ca elimination time (RT80) was unchanged compared to control (n=44/42 cells / 8 diff.). Caffeine application was performed to evaluate sarcoplasmic reticulum (SR) Ca load. We found a shortening of caffeine-induced CaT relaxation time, whereas SR Ca load was unchanged (n=12/13 /8). Further illustrating the transition to TCM, CaT amplitude was progressively decreased after 7d of chronic tachycardia. In contrast to 24h of tachycardia, 7d persistent stimulation resulted in slowed relaxation (RT80, n=75/65 /7). These findings could be explained by a significant reduction of SERCA activity (Ksys-Kcaff) and SR Ca load (n=14/12 / 7). Diastolic Ca concentration remained reduced (n=75/65 /7), in total suggesting a shift to transsarcolemmal Ca elimination.
Sodium measurements (SBFI) revealed a significant increase of intracellular sodium concentration (n=69/69 /5) after 7d of tachycardia.
In patch clamp experiments we detected a prolongation of action potential duration as early as 24h after onset of tachycardia (n=26/21 /4), which persisted throughout 7d of pacing (n=8/12 /3). Resting membrane potential and action potential amplitude were not changed.
Finally, we investigated tachycardia-mediated effects on pre-existing human heart failure (HF). 8h tachycardic stimulation (120bpm) of human HF ventricular trabeculae compromised systolic force, while diastolic tension and relaxation time were markedly increased compared to control (60bpm) (n=7/6 trabeculae /6 human hearts).
The extensive molecular characterization of involved ion channels and pathways mediating transition to TCM is currently under investigation.
Conclusion
This study demonstrates that a persistent tachycardia adversely alters cardiomyocyte excitation-contraction coupling via early electrophysiological cellular remodeling. In pre-existing HF persistent tachycardia strongly aggravates ventricular dysfunction. Our first translational investigation in human myocardium may help to understand the pathophysiology of an underrated and very prevalent disease.
Funding Acknowledgement
Type of funding source: Foundation. Main funding source(s): Else-Kröner-Fresenius-Stiftung
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Affiliation(s)
- M Knierim
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - S Pabel
- University hospital Regensburg, Regensburg, Germany
| | - M Paulus
- University hospital Regensburg, Regensburg, Germany
| | - P Rainer
- Medical University of Graz, Graz, Austria
| | - D Scherr
- Medical University of Graz, Graz, Austria
| | - G Hasenfuss
- University Medical Center of Gottingen (UMG), Goettingen, Germany
| | - L Maier
- University hospital Regensburg, Regensburg, Germany
| | | | - S Sossalla
- University hospital Regensburg, Regensburg, Germany
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26
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Wang Z, Henke S, Paulus M, Welle A, Fan Z, Rodewald K, Rieger B, Fischer RA. Defect Creation in Surface-Mounted Metal-Organic Framework Thin Films. ACS Appl Mater Interfaces 2020; 12:2655-2661. [PMID: 31840974 DOI: 10.1021/acsami.9b18672] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Defect engineering is a strategy for tailoring the properties of metal-organic frameworks (MOFs). Plenty of efforts have been devoted to study the defect chemistry and structures of bulk MOFs; however, the reported example of a defect-engineered surface-mounted MOF (SURMOF) thin film is rare. In this work, defects were incorporated in SURMOF thin films by using defect-generating linkers and taking advantage of the liquid-phase stepwise epitaxial layer-by-layer growth (LBL). Two methods based on the LBL, named mixing method and alternating method, are proposed for incorporating defects in the prototypical SURMOF HKUST-1 by partially substituting the parent H3btc (benzene-1,3,5-tricarboxylic acid) linker with a set of defect-generating linkers H2ip (isophthalic acid), H2OH-ip (5-hydroxyisophthalic acid), and H2pydc (3,5-pyridinedicarboxylic acid). The crystallinity and phase purity of the obtained "defected" SURMOFs were confirmed by X-ray diffraction, infrared reflection absorption spectroscopy, and Raman spectroscopy. The incorporation of the defect-generating linkers and the types of induced defects were characterized by ultraviolet-visible spectroscopy, time-of-flight secondary ion mass spectrometry, methanol adsorption, scanning electron microscopy, and 1H nuclear magnetic resonance spectroscopy (after digestion of the samples). These two methods provide avenues for controlling the defect formation in MOF thin films.
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Affiliation(s)
| | - Sebastian Henke
- Anorganische Chemie, Fakultät für Chemie und Chemische Biologie , Technische Universität Dortmund , Otto-Hahn Str. 6 , 44227 Dortmund , Germany
| | - Michael Paulus
- Fakultät Physik/DELTA , Technische Universität Dortmund , Maria-Goeppert-Mayer-Str. 2 , 44221 Dortmund , Germany
| | - Alexander Welle
- Karlsruher Institut für Technologie , Institut für Funktionelle Grenzflächen (IFG) and Karlsruhe Nano Micro Facility (KNMF) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
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27
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Santiago J, Akeman E, Kirlic N, Clausen AN, Cosgrove KT, McDermott TJ, Mathis B, Paulus M, Craske MG, Abelson J, Martell C, Wolitzky-Taylor K, Bodurka J, Thompson WK, Aupperle RL. Protocol for a randomized controlled trial examining multilevel prediction of response to behavioral activation and exposure-based therapy for generalized anxiety disorder. Trials 2020; 21:17. [PMID: 31907032 PMCID: PMC6943897 DOI: 10.1186/s13063-019-3802-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 10/11/2019] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Only 40-60% of patients with generalized anxiety disorder experience long-lasting improvement with gold standard psychosocial interventions. Identifying neurobehavioral factors that predict treatment success might provide specific targets for more individualized interventions, fostering more optimal outcomes and bringing us closer to the goal of "personalized medicine." Research suggests that reward and threat processing (approach/avoidance behavior) and cognitive control may be important for understanding anxiety and comorbid depressive disorders and may have relevance to treatment outcomes. This study was designed to determine whether approach-avoidance behaviors and associated neural responses moderate treatment response to exposure-based versus behavioral activation therapy for generalized anxiety disorder. METHODS/DESIGN We are conducting a randomized controlled trial involving two 10-week group-based interventions: exposure-based therapy or behavioral activation therapy. These interventions focus on specific and unique aspects of threat and reward processing, respectively. Prior to and after treatment, participants are interviewed and undergo behavioral, biomarker, and neuroimaging assessments, with a focus on approach and avoidance processing and decision-making. Primary analyses will use mixed models to examine whether hypothesized approach, avoidance, and conflict arbitration behaviors and associated neural responses at baseline moderate symptom change with treatment, as assessed using the Generalized Anxiety Disorder-7 item scale. Exploratory analyses will examine additional potential treatment moderators and use data reduction and machine learning methods. DISCUSSION This protocol provides a framework for how studies may be designed to move the field toward neuroscience-informed and personalized psychosocial treatments. The results of this trial will have implications for approach-avoidance processing in generalized anxiety disorder, relationships between levels of analysis (i.e., behavioral, neural), and predictors of behavioral therapy outcome. TRIAL REGISTRATION The study was retrospectively registered within 21 days of first participant enrollment in accordance with FDAAA 801 with ClinicalTrials.gov, NCT02807480. Registered on June 21, 2016, before results.
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Affiliation(s)
- J Santiago
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
| | - E Akeman
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
| | - N Kirlic
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
| | - A N Clausen
- VA Mid-Atlantic Mental Illness Research, Education and Clinical Center, Durham, NC, USA
- Duke University Brain Imaging and Analysis Center, Durham, NC, USA
| | - K T Cosgrove
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
- Department of Psychology, University of Tulsa, Tulsa, OK, USA
| | - T J McDermott
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
- Department of Psychology, University of Tulsa, Tulsa, OK, USA
| | - B Mathis
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
| | - M Paulus
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
- School of Community Medicine, University of Tulsa, Tulsa, OK, USA
| | - M G Craske
- Psychology, Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, CA, USA
| | - J Abelson
- Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
| | - C Martell
- Department of Psychological and Brain Sciences, University of Massachusetts-Amherst, Amherst, MA, USA
| | - K Wolitzky-Taylor
- Psychology, Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, Los Angeles, CA, USA
| | - J Bodurka
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA
- Stephenson School of Biomedical Engineering, The University of Oklahoma, Norman, OK, USA
| | - W K Thompson
- Family Medicine and Public Health, University of California, San Diego, San Diego, CA, USA
| | - Robin L Aupperle
- Laureate Institute for Brain Research, 6655 South Yale Avenue, Tulsa, OK, 74136, USA.
- School of Community Medicine, University of Tulsa, Tulsa, OK, USA.
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28
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Meindl C, Hamerle M, Rogalski D, Paulus M, Schach C, Maier L, Debl K, Birner C, Unsoeld B. P5571MitraClip implantation impairs functional echocardiographic parameters of the left atrium in patients with moderate to severe mitral regurgitation. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz746.0515] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
MitraClip implantation induces hemodynamic unloading and reverse remodeling of the left atrium (LA) and the left ventricle (LV). However little data exist concerning the effects of MitraClip implantation on LA and LV strain reflecting LA and LV function.
Methods and results
From August 2017 to September 2018 62 patients with moderate to severe mitral regurgitation were prospectively enrolled in our single-center RETORT-MR trial (Regensburg Trial on TMVR Techniques in Mitral Regurgitation). All included patients were treated using the MitraClip procedure. Two dimensional speckle tracking echocardiography (2DSTE) of the LA as well as of the LV could be performed in 35 patients with follow-up 2DSTE at four weeks and/or three months after MitraClip implantation. In 25.7% of patients primary mitral regurgitation was present (n=9) and in 74.3% of subjects a secondary entity of mitral regurgitation had been diagnosed (n=26). 57.1% of patients (n=20) suffered from heart failure with preserved ejection fraction (HFpEF) and 42.9% of patients (n=15) had heart failure with reduced ejection fraction (HFrEF). Global longitudinal strain (GLS) was reduced at baseline (−15.3%), at four-week (−14.5%, n=27) and at three-month follow-up (−13.9%, n=28) with no statistically significant differences indicating a sustained mechanical impairment of LV. In contrast significant deterioration was observed in the peak atrial longitudinal strain (PALS) representing LA reservoir function (15.3% at baseline vs. 11.8% at four-week follow-up, n=25, p=0.015 and 16.0% at baseline vs. 13.2% at three-month follow-up, n=25, p=0.03). Similarly to LA reservoir function LA booster function indicating left atrial active contraction was significantly reduced after MitraClip implantation (12.5% at baseline vs. 8.0% at four-week follow-up, n=10, p=0.028). Contrary to LA functional parameters LA size did not change significantly after MitraClip implantation (LA volume index at baseline 74.5 ml/m2 vs. 70.1 ml/m2 at four-week follow-up, n=27, p=0.489).
Conclusion
The present study revealed a deterioration of LA functional parameters (LA reservoir and LA booster function) after MitraClip insertion. It is known that severe mitral regurgitation can cause structural changes of the LA such as fibrosis. MitraClip insertion leads to a significant reduction of regurgitant volumes but structural changes of the LA may not be reversible. In addition MitraClip implantation increases afterload in the LA potentially explaining the observed deterioration of LA functional parameters.
Acknowledgement/Funding
None
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Affiliation(s)
- C Meindl
- University Hospital Regensburg, Regensburg, Germany
| | - M Hamerle
- University Hospital Regensburg, Regensburg, Germany
| | - D Rogalski
- University Hospital Regensburg, Regensburg, Germany
| | - M Paulus
- University Hospital Regensburg, Regensburg, Germany
| | - C Schach
- University Hospital Regensburg, Regensburg, Germany
| | - L Maier
- University Hospital Regensburg, Regensburg, Germany
| | - K Debl
- University Hospital Regensburg, Regensburg, Germany
| | - C Birner
- St. Marien Hospital, Amberg, Germany
| | - B Unsoeld
- University Hospital Regensburg, Regensburg, Germany
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29
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Hölzl C, Kibies P, Imoto S, Noetzel J, Knierbein M, Salmen P, Paulus M, Nase J, Held C, Sadowski G, Marx D, Kast SM, Horinek D. Structure and thermodynamics of aqueous urea solutions from ambient to kilobar pressures: From thermodynamic modeling, experiments, and first principles simulations to an accurate force field description. Biophys Chem 2019; 254:106260. [PMID: 31522071 DOI: 10.1016/j.bpc.2019.106260] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 08/29/2019] [Accepted: 08/29/2019] [Indexed: 12/17/2022]
Abstract
Molecular simulations based on classical force fields are a powerful method for shedding light on the complex behavior of biomolecules in solution. When cosolutes are present in addition to water and biomolecules, subtle balances of weak intermolecular forces have to be accounted for. This imposes high demands on the quality of the underlying force fields, and therefore force field development for small cosolutes is still an active field. Here, we present the development of a new urea force field from studies of urea solutions at ambient and elevated hydrostatic pressures based on a combination of experimental and theoretical approaches. Experimental densities and solvation shell properties from ab initio molecular dynamics simulations at ambient conditions served as the target properties for the force field optimization. Since urea is present in many marine life forms, elevated hydrostatic pressure was rigorously addressed: densities at high pressure were measured by vibrating tube densitometry up to 500 bar and by X-ray absorption up to 5 kbar. Densities were determined by the perturbed-chain statistical associating fluid theory equation of state. Solvation properties were determined by embedded cluster integral equation theory and ab initio molecular dynamics. Our new force field is able to capture the properties of urea solutions at high pressures without further high-pressure adaption, unlike trimethylamine-N-oxide, for which a high-pressure adaption is necessary.
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Affiliation(s)
- Christoph Hölzl
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg, Germany
| | - Patrick Kibies
- Physikalische Chemie III, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Sho Imoto
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Jan Noetzel
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Michael Knierbein
- Laboratory of Thermodynamics, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Paul Salmen
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Julia Nase
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Christoph Held
- Laboratory of Thermodynamics, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Gabriele Sadowski
- Laboratory of Thermodynamics, Technische Universität Dortmund, 44227 Dortmund, Germany
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Stefan M Kast
- Physikalische Chemie III, Technische Universität Dortmund, 44227 Dortmund, Germany.
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg, Germany.
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30
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Degen P, Paulus M, Zwar E, Jakobi V, Dogan S, Tolan M, Rehage H. Surfactant‐mediated formation of alginate layers at the water‐air interface. SURF INTERFACE ANAL 2019. [DOI: 10.1002/sia.6691] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | | | - Elena Zwar
- Faculty of ChemistryTU Dortmund Dortmund Germany
| | - Victoria Jakobi
- Analytical Chemistry—BiointerfacesRuhr‐University Bochum Bochum Germany
| | - Susanne Dogan
- Faculty of Physics/DELTATU Dortmund Dortmund Germany
| | - Metin Tolan
- Faculty of Physics/DELTATU Dortmund Dortmund Germany
| | - Heinz Rehage
- Faculty of ChemistryTU Dortmund Dortmund Germany
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31
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Knierbein M, Held C, Hölzl C, Horinek D, Paulus M, Sadowski G, Sternemann C, Nase J. Density variations of TMAO solutions in the kilobar range: Experiments, PC-SAFT predictions, and molecular dynamics simulations. Biophys Chem 2019; 253:106222. [PMID: 31421516 DOI: 10.1016/j.bpc.2019.106222] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 05/06/2019] [Revised: 07/10/2019] [Accepted: 07/10/2019] [Indexed: 01/12/2023]
Abstract
We present measurements, molecular dynamics (MD) simulations, and predictions using Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) of the density of aqueous solutions in a pressure range from 1 bar to 5000 bar, a pressure regime that is highly relevant for both biochemical applications and the fundamental understanding of solvation. The accurate determination of density data of pressurized solutions remains challenging. We determined relative density changes from the variations in X-ray absorption through the sample and developed a new water parameter set for PC-SAFT modeling that is appropriate for high pressure conditions in the kilobar regime. As a showcase, we studied trimethylamine N-oxide (TMAO) solutions and demonstrated that their compressibility decreases with the TMAO content. This result is linked to the stabilizing effect of TMAO on the local H-bond network of water. Experiments and calculations, which represent two independent methods, are in very good agreement and are in accordance with results of force field molecular dynamics simulations of the same systems.
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Affiliation(s)
- Michael Knierbein
- Technische Universität Dortmund, Laboratory of Thermodynamics, D-44221 Dortmund, Germany
| | - Christoph Held
- Technische Universität Dortmund, Laboratory of Thermodynamics, D-44221 Dortmund, Germany
| | - Christoph Hölzl
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg, Germany
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg, Germany
| | - Michael Paulus
- Technische Universität Dortmund, Fakultät Physik/DELTA, D-44221 Dortmund, Germany
| | - Gabriele Sadowski
- Technische Universität Dortmund, Laboratory of Thermodynamics, D-44221 Dortmund, Germany
| | - Christian Sternemann
- Technische Universität Dortmund, Fakultät Physik/DELTA, D-44221 Dortmund, Germany
| | - Julia Nase
- Technische Universität Dortmund, Fakultät Physik/DELTA, D-44221 Dortmund, Germany.
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32
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Surmeier G, Paulus M, Salmen P, Dogan S, Sternemann C, Nase J. Cholesterol modulates the pressure response of DMPC membranes. Biophys Chem 2019; 252:106210. [PMID: 31265976 DOI: 10.1016/j.bpc.2019.106210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 05/06/2019] [Revised: 06/12/2019] [Accepted: 06/19/2019] [Indexed: 11/16/2022]
Abstract
In this work, the effect of cholesterol on the pressure response of solid-supported phospholipid multilayers is analyzed. It is shown that DMPC multilayers become highly pressure-responsive by the incorporation of low amounts of cholesterol, resulting in a strong pressure-induced expansion of the bilayer spacing. This is accompanied by a high tendency of the multilayer system to detach from the substrate. Increasing the cholesterol concentration reduces the pressure-induced expansion and the membrane structure remains largely unchanged upon pressurization, consequently the stability of the multilayers improves. For a determination of the influence of the substrate, the pressure-dependent behavior of multilayers is compared to that of solid-supported bilayers and multi-lamellar vesicles in bulk solution. While single-supported bilayers remain largely unaffected by external pressure independent of their cholesterol content, multi-lamellar vesicles and multilayers behave similarly.
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Affiliation(s)
- Göran Surmeier
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Paul Salmen
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | - Susanne Dogan
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany
| | | | - Julia Nase
- Fakultät Physik/DELTA, Technische Universität Dortmund, 44221 Dortmund, Germany.
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33
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Levin A, Cinar S, Paulus M, Nase J, Winter R, Czeslik C. Analyzing protein-ligand and protein-interface interactions using high pressure. Biophys Chem 2019; 252:106194. [PMID: 31177023 DOI: 10.1016/j.bpc.2019.106194] [Citation(s) in RCA: 7] [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: 05/15/2019] [Revised: 05/29/2019] [Accepted: 05/29/2019] [Indexed: 01/06/2023]
Abstract
All protein function is based on interactions with the environment. Proteins can bind molecules for their transport, their catalytic conversion, or for signal transduction. They can bind to each other, and they adsorb at interfaces, such as lipid membranes or material surfaces. An experimental characterization is needed to understand the underlying mechanisms, but also to make use of proteins in biotechnology or biomedicine. When protein interactions are studied under high pressure, volume changes are revealed that directly describe spatial contributions to these interactions. Moreover, the strength of protein interactions with ligands or interfaces can be tuned in a smooth way by pressure modulation, which can be utilized in the design of drugs and bio-responsive interfaces. In this short review, selected studies of protein-ligand and protein-interface interactions are presented that were carried out under high pressure. Furthermore, a perspective on bio-responsive interfaces is given where protein-ligand binding is applied to create functional interfacial structures.
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Affiliation(s)
- Artem Levin
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Str. 4a, D-44227 Dortmund, Germany
| | - Süleyman Cinar
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Str. 4a, D-44227 Dortmund, Germany
| | - Michael Paulus
- Technische Universität Dortmund, Fakultät Physik/Delta, D-44221 Dortmund, Germany
| | - Julia Nase
- Technische Universität Dortmund, Fakultät Physik/Delta, D-44221 Dortmund, Germany
| | - Roland Winter
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Str. 4a, D-44227 Dortmund, Germany
| | - Claus Czeslik
- Technische Universität Dortmund, Fakultät für Chemie und Chemische Biologie, Otto-Hahn-Str. 4a, D-44227 Dortmund, Germany.
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Julius K, Weine J, Gao M, Latarius J, Elbers M, Paulus M, Tolan M, Winter R. Impact of Macromolecular Crowding and Compression on Protein–Protein Interactions and Liquid–Liquid Phase Separation Phenomena. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02476] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Karin Julius
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Jonathan Weine
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Mimi Gao
- Physical Chemistry I−Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Str. 4a, 44227 Dortmund, Germany
| | - Jan Latarius
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Mirko Elbers
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Michael Paulus
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Metin Tolan
- Experimental Physics EIA/DELTA−Department of Physics, TU Dortmund University, Otto-Hahn-Str. 4, 44227 Dortmund, Germany
| | - Roland Winter
- Physical Chemistry I−Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Str. 4a, 44227 Dortmund, Germany
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Demand S, Egger S, Degen P, Salmen P, Paulus M, Tolan M, Rehage H. New Approach to Structure–Property Correlations of Different Films of Sorbitan Esters and Their Self‐Assembly into Viscoelastic Monolayers. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sarah Demand
- Physikalische Chemie II, Technische Universität Dortmund D‐44227, Dortmund Germany
| | - Simon Egger
- Physikalische Chemie II, Technische Universität Dortmund D‐44227, Dortmund Germany
| | - Patrick Degen
- Physikalische Chemie II, Technische Universität Dortmund D‐44227, Dortmund Germany
| | - Paul Salmen
- Experimentelle Physik I/DELTATechnische Universität Dortmund D‐44227, Dortmund Germany
| | - Michael Paulus
- Experimentelle Physik I/DELTATechnische Universität Dortmund D‐44227, Dortmund Germany
| | - Metin Tolan
- Experimentelle Physik I/DELTATechnische Universität Dortmund D‐44227, Dortmund Germany
| | - Heinz Rehage
- Physikalische Chemie II, Technische Universität Dortmund D‐44227, Dortmund Germany
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36
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Julius K, Weine J, Berghaus M, König N, Gao M, Latarius J, Paulus M, Schroer MA, Tolan M, Winter R. Water-Mediated Protein-Protein Interactions at High Pressures are Controlled by a Deep-Sea Osmolyte. Phys Rev Lett 2018; 121:038101. [PMID: 30085800 DOI: 10.1103/physrevlett.121.038101] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Indexed: 06/08/2023]
Abstract
The influence of natural cosolvent mixtures on the pressure-dependent structure and protein-protein interaction potential of dense protein solutions is studied and analyzed using small-angle X-ray scattering in combination with a liquid-state theoretical approach. The deep-sea osmolyte trimethylamine-N-oxide is shown to play a crucial and singular role in its ability to not only guarantee sustainability of the native protein's folded state under harsh environmental conditions, but it also controls water-mediated intermolecular interactions at high pressure, thereby preventing contact formation and hence aggregation of proteins.
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Affiliation(s)
- Karin Julius
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Jonathan Weine
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Melanie Berghaus
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Nico König
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Mimi Gao
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
| | - Jan Latarius
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Michael Paulus
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Martin A Schroer
- European Molecular Biology Laboratory (EMBL) Hamburg c/o DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - Metin Tolan
- Faculty of Physics/DELTA, TU Dortmund University, 44221 Dortmund, Germany
| | - Roland Winter
- Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227 Dortmund, Germany
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Forov Y, Paulus M, Dogan S, Salmen P, Weis C, Gahlmann T, Behrendt A, Albers C, Elbers M, Schnettger W, Egger S, Zwar E, Rehage H, Kiesel I, Riedl T, Tolan M. Adsorption Behavior of Lysozyme at Titanium Oxide-Water Interfaces. Langmuir 2018; 34:5403-5408. [PMID: 29658720 DOI: 10.1021/acs.langmuir.8b00280] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present an in situ X-ray reflectivity study of the adsorption behavior of the protein lysozyme on titanium oxide layers under variation of different thermodynamic parameters, such as temperature, hydrostatic pressure, and pH value. Moreover, by varying the layer thickness of the titanium oxide layer on a silicon wafer, changes in the adsorption behavior of lysozyme were studied. In total, we determined less adsorption on titanium oxide compared with silicon dioxide, while increasing the titanium oxide layer thickness causes stronger adsorption. Furthermore, the variation of temperature from 20 to 80 °C yields an increase in the amount of adsorbed lysozyme at the interface. Additional measurements with variation of the pH value of the system in a region between pH 2 and 12 show that the surface charge of both protein and titanium oxide has a crucial role in the adsorption process. Further pressure-dependent experiments between 50 and 5000 bar show a reduction of the amount of adsorbed lysozyme with increasing pressure.
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Affiliation(s)
- Yury Forov
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Michael Paulus
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Susanne Dogan
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Paul Salmen
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Christopher Weis
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Tobias Gahlmann
- Institute of Electronic Devices , University of Wuppertal , 42119 Wuppertal , Germany
| | - Andreas Behrendt
- Institute of Electronic Devices , University of Wuppertal , 42119 Wuppertal , Germany
| | - Christian Albers
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Mirko Elbers
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
| | - Wiebke Schnettger
- Physikalische Chemie I-Biophysikalische Chemie, Fakultät für Chemie und Chemische Biologie , TU Dortmund , Dortmund 44221 , Germany
| | - Simon Egger
- Physikalische Chemie II , TU Dortmund , Dortmund 44221 , Germany
| | - Elena Zwar
- Physikalische Chemie II , TU Dortmund , Dortmund 44221 , Germany
| | - Heinz Rehage
- Physikalische Chemie II , TU Dortmund , Dortmund 44221 , Germany
| | - Irena Kiesel
- Physikalische Chemie I-Biophysikalische Chemie, Fakultät für Chemie und Chemische Biologie , TU Dortmund , Dortmund 44221 , Germany
| | - Thomas Riedl
- Institute of Electronic Devices , University of Wuppertal , 42119 Wuppertal , Germany
| | - Metin Tolan
- Fakultät Physik/DELTA , Technische Universität Dortmund , 44221 Dortmund , Germany
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Dogan S, Paulus M, Forov Y, Weis C, Kampmann M, Cewe C, Kiesel I, Degen P, Salmen P, Rehage H, Tolan M. Human Apolipoprotein A1 at Solid/Liquid and Liquid/Gas Interfaces. J Phys Chem B 2018; 122:3953-3960. [PMID: 29488751 DOI: 10.1021/acs.jpcb.7b12481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An X-ray reflectivity study on the adsorption behavior of human apolipoprotein A1 (apoA1) at hydrophilic and hydrophobic interfaces is presented. It is shown that the protein interacts via electrostatic and hydrophobic interactions with the interfaces, resulting in the absorption of the protein. pH dependent measurements at the solid/liquid interface between silicon dioxide and aqueous protein solution show that in a small pH range between pH 4 and 6, adsorption is increased due to electrostatic attraction. Here, the native shape of the protein seems to be conserved. In contrast, the adsorption at the liquid/gas interface is mainly driven by hydrophobic effects, presumably by extending the hydrophobic regions of the amphipathic helices, and results in a conformational change of the protein during adsorption. However, the addition of differently charged membrane-forming lipids at the liquid/gas interface illustrates the ability of apoA1 to include lipids, resulting in a depletion of the lipids from the interface.
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Persoon S, Paulus M, Hirt S, Jungbauer C, Dietl A, Luchner A, Schmid C, Maier LS, Birner C. Cardiac unloading by LVAD support differentially influences components of the cGMP-PKG signaling pathway in ischemic and dilated cardiomyopathy. Heart Vessels 2018; 33:948-957. [PMID: 29546540 DOI: 10.1007/s00380-018-1149-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 03/09/2018] [Indexed: 12/11/2022]
Abstract
Implantation of left ventricular assist devices (LVADs) as bridge to transplant in end-stage heart failure allows for analyzing reverse remodeling processes of the supported heart. Whether this therapy influences the cGMP-PKG signaling pathway, which is currently under thorough investigation for developing new heart failure therapeutics, is unknown. In fourteen end-stage heart failure patients (8 with dilated cardiomyopathy, DCM; 6 with ischemic cardiomyopathy, ICM) tissue specimens of left ventricles were collected at LVAD implantation and afterwards at receiver heart explantation, respectively. Then the expressions of key components of the cGMP-PKG signaling pathway were determined by polymerase chain reaction (ANP; BNP; natriuretic peptide receptor A, NPR-A; natriuretic peptide receptor C, NPR-C; neprilysin; NOS3; soluble guanylyl cyclase, sGC; PDE5; cGMP-dependent protein kinase G, PKG) and enzyme-linked immunosorbent assay (cGMP), respectively. Patients were predominantly male, 52 ± 10 years old, were receiving recommended heart failure therapy, and had their donor organ implanted after 351 ± 317 days of LVAD support. Except for more DCM patients with ICD therapy, no significant differences were detected between ICM and DCM, which also applies to the expression of cGMP-PKG pathway components at baseline. After LVAD support, ANP, NPR-C, and cGMP were significantly down-regulated and neprilysin, PDE5, and PKG I expressions were reduced with borderline significance in DCM, but not in ICM patients. Multiple significant correlations were found for expression differences (i.e., expression at LVAD implantation minus expression at heart transplantation) both in DCM and ICM, even though there was a closer connection between the NO and NP side of the cGMP-PKG pathway in DCM patients. Furthermore, duration of LVAD support negatively correlated with expression differences of PKG I, PDE5, and sGC in ICM, but not in DCM. Originating from the same activation level at LVAD implantation, cardiac unloading significantly alters key components of the cGMP-PKG pathway in DCM, but not in ICM patients. This etiology-specific regulation should be considered when analyzing therapeutic interventions with effects on this signaling pathway.
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Affiliation(s)
- Sven Persoon
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Michael Paulus
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Stephan Hirt
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Carsten Jungbauer
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Alexander Dietl
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | | | - Christof Schmid
- Department of Cardiothoracic Surgery, University Hospital Regensburg, Regensburg, Germany
| | - Lars S Maier
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany
| | - Christoph Birner
- Department of Internal Medicine II, University Hospital Regensburg, Regensburg, Germany.
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Julius K, Al-Ayoubi SR, Paulus M, Tolan M, Winter R. The effects of osmolytes and crowding on the pressure-induced dissociation and inactivation of dimeric LADH. Phys Chem Chem Phys 2018; 20:7093-7104. [DOI: 10.1039/c7cp08242h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Compatible osmolytes are able to efficiently modulate the oligomeric state, stability and activity of enzymes at high pressures.
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Affiliation(s)
- Karin Julius
- Fakultät Physik/DELTA
- TU Dortmund University
- 44221 Dortmund
- Germany
| | - Samy R. Al-Ayoubi
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
| | - Michael Paulus
- Fakultät Physik/DELTA
- TU Dortmund University
- 44221 Dortmund
- Germany
| | - Metin Tolan
- Fakultät Physik/DELTA
- TU Dortmund University
- 44221 Dortmund
- Germany
| | - Roland Winter
- Physical Chemistry I – Biophysical Chemistry
- Department of Chemistry and Chemical Biology
- TU Dortmund University
- 44227 Dortmund
- Germany
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Wirkert FJ, Hölzl C, Paulus M, Salmen P, Tolan M, Horinek D, Nase J. The Hydrophobic Gap at High Hydrostatic Pressures. Angew Chem Int Ed Engl 2017; 56:12958-12961. [PMID: 28816388 DOI: 10.1002/anie.201706662] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Indexed: 11/09/2022]
Abstract
We have gained new insight into the so-called hydrophobic gap, a molecularly thin region of decreased electron density at the interface between water and a solid hydrophobic surface, by X-ray reflectivity experiments and molecular dynamics simulations at different hydrostatic pressures. Pressure variations show that the hydrophobic gap persists up to a pressure of 5 kbar. The electron depletion in the interfacial region strongly decreases with an increase in pressure, indicating that the interfacial region is compressed more strongly than bulk water. The decrease is most significant up to 2 kbar; beyond that, the pressure response of the depletion is less pronounced.
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Affiliation(s)
| | - Christoph Hölzl
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, 44221, Dortmund, Germany
| | - Paul Salmen
- Fakultät Physik/DELTA, TU Dortmund, 44221, Dortmund, Germany
| | - Metin Tolan
- Fakultät Physik/DELTA, TU Dortmund, 44221, Dortmund, Germany
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Germany
| | - Julia Nase
- Fakultät Physik/DELTA, TU Dortmund, 44221, Dortmund, Germany
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Wirkert FJ, Hölzl C, Paulus M, Salmen P, Tolan M, Horinek D, Nase J. The Hydrophobic Gap at High Hydrostatic Pressures. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706662] [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: 11/05/2022]
Affiliation(s)
| | - Christoph Hölzl
- Institut für Physikalische und Theoretische Chemie; Universität Regensburg; Germany
| | - Michael Paulus
- Fakultät Physik/DELTA; TU Dortmund; 44221 Dortmund Germany
| | - Paul Salmen
- Fakultät Physik/DELTA; TU Dortmund; 44221 Dortmund Germany
| | - Metin Tolan
- Fakultät Physik/DELTA; TU Dortmund; 44221 Dortmund Germany
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie; Universität Regensburg; Germany
| | - Julia Nase
- Fakultät Physik/DELTA; TU Dortmund; 44221 Dortmund Germany
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McGraw JD, Klos M, Bridet A, Hähl H, Paulus M, Castillo JM, Horsch M, Jacobs K. Influence of bidisperse self-assembled monolayer structure on the slip boundary condition of thin polymer films. J Chem Phys 2017; 146:203326. [DOI: 10.1063/1.4978676] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Joshua D. McGraw
- Soft Matter Physics Group, Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
- Département de Physique, Ecole Normale Supérieure/PSL Research University, CNRS, 24 Rue Lhomond, 75005 Paris, France
| | - Mischa Klos
- Soft Matter Physics Group, Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
| | - Antoine Bridet
- Soft Matter Physics Group, Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
| | - Hendrik Hähl
- Soft Matter Physics Group, Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, 44221 Dortmund, Germany
| | - Juan Manuel Castillo
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger-Strasse 44, 67663 Kaiserslautern, Germany
| | - Martin Horsch
- Laboratory of Engineering Thermodynamics, University of Kaiserslautern, Erwin-Schrödinger-Strasse 44, 67663 Kaiserslautern, Germany
| | - Karin Jacobs
- Soft Matter Physics Group, Experimental Physics, Saarland University, 66041 Saarbrücken, Germany
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König N, Paulus M, Julius K, Schulze J, Voetz M, Tolan M. Antibodies under pressure: A Small-Angle X-ray Scattering study of Immunoglobulin G under high hydrostatic pressure. Biophys Chem 2017. [PMID: 28622937 DOI: 10.1016/j.bpc.2017.05.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
In the present work two subclasses of the human antibody Immunoglobulin G (IgG) have been investigated by Small-Angle X-ray Scattering under high hydrostatic pressures up to 5kbar. It is shown that IgG adopts a symmetric T-shape in solution which differs significantly from available crystal structures. Moreover, high-pressure experiments verify the high stability of the IgG molecule. It is not unfolded by hydrostatic pressures of up to 5kbar but a slight increase of the radius of gyration was observed at elevated pressures.
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Affiliation(s)
- Nico König
- Fakultät Physik/DELTA, TU Dortmund, Dortmund 44221, Germany; Bayer AG, Leverkusen 51368, Germany.
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, Dortmund 44221, Germany
| | - Karin Julius
- Fakultät Physik/DELTA, TU Dortmund, Dortmund 44221, Germany
| | - Julian Schulze
- Fakultät Physik/DELTA, TU Dortmund, Dortmund 44221, Germany
| | | | - Metin Tolan
- Fakultät Physik/DELTA, TU Dortmund, Dortmund 44221, Germany
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Jakobi V, Salmen P, Paulus M, Tolan M, Rosenhahn A. Compositional fingerprint of soy sauces via hydrophobic surface interaction. Food Chem 2017; 218:256-260. [DOI: 10.1016/j.foodchem.2016.09.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 07/07/2016] [Accepted: 09/06/2016] [Indexed: 10/21/2022]
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Koehler C, Paulus M, Ginzkey C, Hackenberg S, Scherzad A, Ickrath P, Hagen R, Kleinsasser N. The Proinflammatory Potential of Nitrogen Dioxide and Its Influence on the House Dust Mite Allergen Der p 1. Int Arch Allergy Immunol 2016; 171:27-35. [PMID: 27820923 DOI: 10.1159/000450751] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 09/12/2016] [Indexed: 11/19/2022] Open
Abstract
Asthma and allergies are both major global health problems with an increasing prevalence, and environmental data implicate an influence of air pollutants on their development. The present study focuses on the influence of nitrogen dioxide (NO2) and the major allergen of the house dust mite Der p 1 on human nasal epithelial cells of nonallergic patients in vitro. Nasal epithelial mucosa samples of 11 donors were harvested during nasal air passage surgery and cultured as an air-liquid interface. Exposure to 0.1, 1 and 10 ppm NO2 or synthetic air as a control was performed for 1 h. Subsequently, the cells were exposed to Der p 1 for 24 h. The release of interleukin (IL)-6 and IL-8 was measured by ELISA, and the production of IL-6 mRNA and IL-8 mRNA was measured by RT-PCR. NO2 exposure resulted in a concentration-dependent release of IL-6, but not IL-8 release. The coexposure of 0.1 ppm NO2 and Der p 1, or 1 ppm NO2 and Der p 1 significantly increased both IL-6 and IL-8 release. Exposure to NO2, Der p 1, or their combination, did not significantly influence the production of IL-6 or IL-8 mRNA. In conclusion, NO2 increases the release of inflammatory cytokines in human nasal epithelial cells, especially in coexposure with Der p 1, as a mechanism of allergotoxicology.
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Affiliation(s)
- Christian Koehler
- Department of Oto-Rhino-Laryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, University Hospital of Würzburg, Würzburg, Germany
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Tiemeyer S, Bombeck M, Göhring H, Paulus M, Sternemann C, Nase J, Wirkert FJ, Möller J, Büning T, Seeck OH, Reuter D, Wieck AD, Bayer M, Tolan M. Polaron-induced lattice distortion of (In,Ga)As/GaAs quantum dots by optically excited carriers. Nanotechnology 2016; 27:425702. [PMID: 27622774 DOI: 10.1088/0957-4484/27/42/425702] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on a high resolution x-ray diffraction study unveiling the effect of carriers optically injected into (In,Ga)As quantum dots on the surrounding GaAs crystal matrix. We find a tetragonal lattice expansion with enhanced elongation along the [001] crystal axis that is superimposed on an isotropic lattice extension. The isotropic contribution arises from excitation induced lattice heating as confirmed by temperature dependent reference studies. The tetragonal expansion on the femtometer scale is tentatively attributed to polaron formation by carriers trapped in the quantum dots.
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Affiliation(s)
- S Tiemeyer
- Fakultät Physik / DELTA, Technische Universität Dortmund, D-44221 Dortmund, Germany
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48
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Dogan S, Paulus M, Salmen P, Forov Y, Weis C, Tolan M. pH- and surface pressure-dependant adsorption of human apolipoprotein A1 at solid/liquid and gas/liquid interfaces. Acta Crystallogr A Found Adv 2016. [DOI: 10.1107/s2053273316096625] [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: 11/10/2022] Open
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49
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Berghaus M, Paulus M, Salmen P, Al-Ayoubi S, Tolan M, Winter R. Near-Surface and Bulk Behavior of Bicontinuous Microemulsions under High-Pressure Conditions. J Phys Chem B 2016; 120:7148-53. [DOI: 10.1021/acs.jpcb.6b05639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Melanie Berghaus
- Physical Chemistry
I − Biophysical Chemistry, TU Dortmund, D-44227 Dortmund, Germany
| | - Michael Paulus
- Fakultät Physik/DELTA, TU Dortmund, D-44221 Dortmund, Germany
| | - Paul Salmen
- Fakultät Physik/DELTA, TU Dortmund, D-44221 Dortmund, Germany
| | - Samy Al-Ayoubi
- Physical Chemistry
I − Biophysical Chemistry, TU Dortmund, D-44227 Dortmund, Germany
| | - Metin Tolan
- Fakultät Physik/DELTA, TU Dortmund, D-44221 Dortmund, Germany
| | - Roland Winter
- Physical Chemistry
I − Biophysical Chemistry, TU Dortmund, D-44227 Dortmund, Germany
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50
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Tillmann W, Hagen L, Hoffmann F, Dildrop M, Wibbeke A, Schöppner V, Resonnek V, Pohl M, Krumm C, Tiller JC, Paulus M, Sternemann C. The detachment behavior of polycarbonate on thin films above the glass transition temperature. POLYM ENG SCI 2016. [DOI: 10.1002/pen.24307] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- W. Tillmann
- Institute of Materials Engineering; TU Dortmund University; Dortmund Germany
| | - L. Hagen
- Institute of Materials Engineering; TU Dortmund University; Dortmund Germany
| | - F. Hoffmann
- Institute of Materials Engineering; TU Dortmund University; Dortmund Germany
| | - M. Dildrop
- Institute of Materials Engineering; TU Dortmund University; Dortmund Germany
| | - A. Wibbeke
- Polymer Engineering Paderborn-Polymer Engineering; University of Paderborn; Paderborn Germany
| | - V. Schöppner
- Polymer Engineering Paderborn-Polymer Engineering; University of Paderborn; Paderborn Germany
| | - V. Resonnek
- Polymer Engineering Paderborn-Polymer Engineering; University of Paderborn; Paderborn Germany
| | - M. Pohl
- Polymer Engineering Paderborn-Polymer Engineering; University of Paderborn; Paderborn Germany
| | - C. Krumm
- Chair of Biomaterials and Polymer Science; TU Dortmund University; Dortmund Germany
| | - J. C. Tiller
- Chair of Biomaterials and Polymer Science; TU Dortmund University; Dortmund Germany
| | - M. Paulus
- Fakultät Physik/DELTA; TU Dortmund University; Dortmund Germany
| | - C. Sternemann
- Fakultät Physik/DELTA; TU Dortmund University; Dortmund Germany
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