1
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Mondellini S, Schwarzer M, Völkl M, Jasinski J, Jérôme V, Scheibel T, Laforsch C, Freitag R. Size dependent uptake and trophic transfer of polystyrene microplastics in unicellular freshwater eukaryotes. Sci Total Environ 2024; 929:172470. [PMID: 38621530 DOI: 10.1016/j.scitotenv.2024.172470] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 04/10/2024] [Accepted: 04/11/2024] [Indexed: 04/17/2024]
Abstract
Microplastics (MP) have become a well-known and widely investigated environmental pollutant. Despite the huge amount of new studies investigating the potential threat posed by MP, the possible uptake and trophic transfer in lower trophic levels of freshwater ecosystems remains understudied. This study aims to investigate the internalization and potential trophic transfer of fluorescent polystyrene (PS) beads (0.5 μm, 3.6 × 108 particles/mL; 6 μm, 2.1 × 105 particles/mL) and fragments (<30 μm, 5 × 103 particles/mL) in three unicellular eukaryotes. This study focuses on the size-dependent uptake of MP by two freshwater Ciliophora, Tetrahymena pyriformis, Paramecium caudatum and one Amoebozoa, Amoeba proteus, serving also as predator for experiments on potential trophic transfer. Size-dependent uptake of MP in all three unicellular eukaryotes was shown. P. caudatum is able to take up MP fragments up to 27.7 μm, while T. pyriformis ingests particles up to 10 μm. In A. proteus, small MP (PS0.5μm and PS6μm) were taken up via pinocytosis and were detected in the cytoplasm for up to 14 days after exposure. Large PS-MP (PS<30μm) were detected in A. proteus only after predation on MP-fed Ciliophora. These results indicate that A. proteus ingests larger MP via predation on Ciliophora (PS<30μm), which would not be taken up otherwise. This study shows trophic transfer of MP at the base of the aquatic food web and serves as basis to study the impact of MP in freshwater ecosystems.
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Affiliation(s)
- Simona Mondellini
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany
| | - Michael Schwarzer
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany
| | - Matthias Völkl
- Process Biotechnology, University of Bayreuth, 95447 Bayreuth, Germany
| | - Julia Jasinski
- Biomaterials, University of Bayreuth, 95447 Bayreuth, Germany
| | - Valérie Jérôme
- Process Biotechnology, University of Bayreuth, 95447 Bayreuth, Germany
| | - Thomas Scheibel
- Biomaterials, University of Bayreuth, 95447 Bayreuth, Germany; Bayerisches Polymerinstitut (BPI), University of Bayreuth, 95447 Bayreuth, Germany; Bayreuther Zentrum für Kolloide und Grenzflächen (BZKG), University of Bayreuth, 95447 Bayreuth, Germany; Bayreuther Zentrum für Molekulare Biowissenschaften (BZMB), University of Bayreuth, 95447 Bayreuth, Germany; Bayreuther Materialzentrum (BayMAT), University of Bayreuth, 95447 Bayreuth, Germany
| | - Christian Laforsch
- Animal Ecology I and BayCEER, University of Bayreuth, 95447 Bayreuth, Germany.
| | - Ruth Freitag
- Process Biotechnology, University of Bayreuth, 95447 Bayreuth, Germany; Bayreuther Zentrum für Molekulare Biowissenschaften (BZMB), University of Bayreuth, 95447 Bayreuth, Germany.
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2
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Heyne E, Zeeb S, Junker C, Petzinna A, Schrepper A, Doenst T, Koch LG, Britton SL, Schwarzer M. Exercise Training Differentially Affects Skeletal Muscle Mitochondria in Rats with Inherited High or Low Exercise Capacity. Cells 2024; 13:393. [PMID: 38474357 DOI: 10.3390/cells13050393] [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: 12/31/2023] [Revised: 02/20/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024] Open
Abstract
Exercise capacity has been related to morbidity and mortality. It consists of an inherited and an acquired part and is dependent on mitochondrial function. We assessed skeletal muscle mitochondrial function in rats with divergent inherited exercise capacity and analyzed the effect of exercise training. Female high (HCR)- and low (LCR)-capacity runners were trained with individually adapted high-intensity intervals or kept sedentary. Interfibrillar (IFM) and subsarcolemmal (SSM) mitochondria from gastrocnemius muscle were isolated and functionally assessed (age: 15 weeks). Sedentary HCR presented with higher exercise capacity than LCR paralleled by higher citrate synthase activity and IFM respiratory capacity in skeletal muscle of HCR. Exercise training increased exercise capacity in both HCR and LCR, but this was more pronounced in LCR. In addition, exercise increased skeletal muscle mitochondrial mass more in LCR. Instead, maximal respiratory capacity was increased following exercise in HCRs' IFM only. The results suggest that differences in skeletal muscle mitochondrial subpopulations are mainly inherited. Exercise training resulted in different mitochondrial adaptations and in higher trainability of LCR. HCR primarily increased skeletal muscle mitochondrial quality while LCR increased mitochondrial quantity in response to exercise training, suggesting that inherited aerobic exercise capacity differentially affects the mitochondrial response to exercise training.
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Affiliation(s)
- Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Susanne Zeeb
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Celina Junker
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Andreas Petzinna
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Andrea Schrepper
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
| | - Lauren G Koch
- Department of Physiology and Pharmacology, College of Medicine and Life Sciences, The University Toledo, Toledo, OH 43606, USA
| | - Steven L Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Friedrich Schiller University of Jena, 07747 Jena, Germany
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3
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Spagnolo A, Klug S, Schenkl C, Schwarzer M. Links between Exercise Capacity, Exercise Training, and Metabolism. Compr Physiol 2023; 13:5115-5155. [PMID: 37770189 DOI: 10.1002/cphy.c230004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Exercise capacity of an individual describes the ability to perform physical activity. This exercise capacity is influenced by intrinsic factors such as genetic constitution and extrinsic factors such as exercise training. On the metabolic level exercise and metabolism are linked. As an important site of metabolism and the main source for ATP needed for muscle contraction, mitochondrial function can determine exercise capacity, and exercise inversely influences mitochondrial function. It has been suggested that exercise mediates many of its effects due to such metabolic changes. Although extrinsic factors affect exercise capacity, a major part of an individual's exercise capacity is genetically determined, and extrinsic factors can only improve on this baseline. Looking at the effect of exercise capacity on and with disease, the two go hand in hand. On one hand, disease is negatively affecting an individual's exercise capacity; on the other hand, exercise offers an effective treatment option. Combining these factors, exercise capacity is an often-ignored prognostic variable for life expectancy as well as morbidity and mortality. In this review, we aim to provide the current knowledge on the links between inherited and acquired exercise capacity, as well as the mechanisms in which metabolism interacts with exercise capacity. © 2023 American Physiological Society. Compr Physiol 13:5115-5155, 2023.
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Affiliation(s)
- Alena Spagnolo
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Sebastian Klug
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Christina Schenkl
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
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4
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Heiss J, Grün K, Tempel L, Matasci M, Schrepper A, Schwarzer M, Bauer R, Förster M, Berndt A, Jung C, Schulze PC, Neri D, Franz M. Targeted Interleukin-9 delivery in pulmonary hypertension: Comparison of immunocytokine formats and effector cell study. Eur J Clin Invest 2023; 53:e13907. [PMID: 36377348 DOI: 10.1111/eci.13907] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 10/19/2022] [Accepted: 10/27/2022] [Indexed: 11/16/2022]
Abstract
AIMS Pulmonary hypertension (PH) is accompanied by pulmonary vascular remodelling. By targeted delivery of Interleukin-9 (IL9) via the immunocytokine F8IL9, beneficial effects could be demonstrated in a mouse model of PH. This study aimed to compare two immunocytokine formats (single-chain Fv and full IgG) and to identify potential target cells of IL9. METHODS The Monocrotaline mouse model of PH (PH, n = 12) was chosen to evaluate the treatment effects of F8IL9F8 (n = 12) and F8IgGIL9 (n = 6) compared with sham-induced animals (control, n = 10), the dual endothelin receptor antagonist Macitentan (MAC, n = 12) or IL9-based immunocytokines with irrelevant antigen specificity (KSFIL9KSF, n = 12; KSFIgGIL9 n = 6). Besides comparative validation of treatment effects, the study was focused on the detection and quantification of mast cells (MCs) and regulatory T cells (Tregs). RESULTS There was a significantly elevated systolic right ventricular pressure (104 ± 36 vs. 45 ± 17 mmHg) and an impairment of right ventricular echocardiographic parameters (RVbasal: 2.52 ± 0.25 vs. 1.94 ± 0.13 mm) in untreated PH compared with controls (p < 0.05). Only the groups treated with F8IL9, irrespective of the format, showed consistent beneficial effects (p < 0.05). Moreover, F8IL9F8 but not F8IgGIL9 treatment significantly reduced lung tissue damage compared with untreated PH mice (p < 0.05). There was a significant increase in Tregs in F8IL9-treated compared with control animals, the untreated PH and the MAC group (p < 0.05). CONCLUSIONS Beneficial treatment effects of targeted IL9 delivery in a preclinical model of PH could be convincingly validated. IL9-mediated recruitment of Tregs into lung tissue might play a crucial role in the induction of anti-inflammatory and anti-proliferative mechanisms potentially contributing to a novel disease-modifying concept.
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Affiliation(s)
- Judith Heiss
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany.,Else Kröner Graduate School for Medical Students "JSAM", Jena University Hospital, Jena, Germany
| | - Katja Grün
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany
| | - Laura Tempel
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany
| | | | - Andrea Schrepper
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
| | - Reinhard Bauer
- Institute of Molecular Cell Biology, Center for Molecular Biomedicine, University Hospital Jena, Jena, Germany
| | - Martin Förster
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany
| | - Alexander Berndt
- Section Pathology, Institute of Legal Medicine, University Hospital Jena, Jena, Germany
| | - Christian Jung
- Division of Cardiology, Pulmonology, and Vascular Medicine, Medical Faculty, Heinrich-Heine University Düsseldorf, Düsseldorf, Germany
| | | | | | - Marcus Franz
- Department of Internal Medicine I, University Hospital Jena, Jena, Germany
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5
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Fingerhut J, Lecroart L, Borodin D, Schwarzer M, Hörandl S, Kandratsenka A, Auerbach DJ, Wodtke AM, Kitsopoulos TN. Binding Energy and Diffusion Barrier of Formic Acid on Pd(111). J Phys Chem A 2022; 127:142-152. [PMID: 36583672 PMCID: PMC9841570 DOI: 10.1021/acs.jpca.2c07414] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Velocity-resolved kinetics is used to measure the thermal rate of formic acid desorption from Pd(111) between 228 and 273 K for four isotopologues: HCOOH, HCOOD, DCOOH, DCOOD. Upon molecular adsorption, formic acid undergoes decomposition to CO2 and H2 and thermal desorption. To disentangle the contributions of individual processes, we implement a mass-balance-based calibration procedure from which the branching ratio between desorption and decomposition for formic acid is determined. From experimentally derived elementary desorption rate constants, we obtain the binding energy 639 ± 8 meV and the diffusion barrier 370 ± 130 meV using the detailed balance rate model (DBRM). The DBRM explains the observed kinetic isotope effects.
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Affiliation(s)
- Jan Fingerhut
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany
| | - Loïc Lecroart
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany
| | - Dmitriy Borodin
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany,Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany,Email
| | - Michael Schwarzer
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany
| | - Stefan Hörandl
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany
| | - Alexander Kandratsenka
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany
| | - Daniel J. Auerbach
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany
| | - Alec M. Wodtke
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany,Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany,International
Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Goettingen 37077, Germany
| | - Theofanis N. Kitsopoulos
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Goettingen 37077, Germany,Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Goettingen 37077, Germany,Department
of Chemistry, University of Crete, Heraklion 715 00, Greece,Institute
of Electronic Structure and Laser − FORTH, Heraklion 70013, Greece,Email
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6
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Borodin D, Galparsoro O, Rahinov I, Fingerhut J, Schwarzer M, Hörandl S, Auerbach DJ, Kandratsenka A, Schwarzer D, Kitsopoulos TN, Wodtke AM. Steric Hindrance of NH 3 Diffusion on Pt(111) by Co-Adsorbed O-Atoms. J Am Chem Soc 2022; 144:21791-21799. [DOI: 10.1021/jacs.2c10458] [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: 11/19/2022]
Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
| | - Oihana Galparsoro
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, Donostia-San Sebastián20018, Spain
- Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, P.K. 1072Donostia-San Sebastián20018, Spain
| | - Igor Rahinov
- Department of Natural Sciences, The Open University of Israel, Raanana4353701, Israel
| | - Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
| | - Stefan Hörandl
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
| | - Daniel J. Auerbach
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
| | - Alexander Kandratsenka
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
| | - Theofanis N. Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
- Department of Chemistry, University of Crete, Heraklion71500, Greece
- Institute of Electronic Structure and Laser − FORTH, Heraklion70013, Greece
| | - Alec M. Wodtke
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Goettingen37077, Germany
- International Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, Goettingen37077, Germany
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7
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Schwarzer M, Hertl N, Nitz F, Borodin D, Fingerhut J, Kitsopoulos TN, Wodtke AM. Adsorption and Absorption Energies of Hydrogen with Palladium. J Phys Chem C Nanomater Interfaces 2022; 126:14500-14508. [PMID: 36081903 PMCID: PMC9442642 DOI: 10.1021/acs.jpcc.2c04567] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 08/04/2022] [Indexed: 06/15/2023]
Abstract
Thermal recombinative desorption rates of HD on Pd(111) and Pd(332) are reported from transient kinetic experiments performed between 523 and 1023 K. A detailed kinetic model accurately describes the competition between recombination of surface-adsorbed hydrogen and deuterium atoms and their diffusion into the bulk. By fitting the model to observed rates, we derive the dissociative adsorption energies (E 0, ads H2 = 0.98 eV; E 0, ads D2 = 1.00 eV; E 0, ads HD = 0.99 eV) as well as the classical dissociative binding energy ϵads = 1.02 ± 0.03 eV, which provides a benchmark for electronic structure theory. In a similar way, we obtain the classical energy required to move an H or D atom from the surface to the bulk (ϵsb = 0.46 ± 0.01 eV) and the isotope specific energies, E 0, sb H = 0.41 eV and E 0, sb D = 0.43 eV. Detailed insights into the process of transient bulk diffusion are obtained from kinetic Monte Carlo simulations.
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Affiliation(s)
- Michael Schwarzer
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
| | - Nils Hertl
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Goettingen 37077, Germany
| | - Florian Nitz
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
| | - Dmitriy Borodin
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Goettingen 37077, Germany
| | - Jan Fingerhut
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
| | - Theofanis N. Kitsopoulos
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Goettingen 37077, Germany
- Department
of Chemistry, University of Crete, Heraklion 71003, Greece
- Institute
of Electronic Structure and Laser − FORTH, Heraklion 71110, Greece
| | - Alec M. Wodtke
- Institute
for Physical Chemistry, Georg-August University
Goettingen, Tammannstraße 6, Goettingen 37077, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Multidisciplinary Sciences, Am Fassberg 11, Goettingen 37077, Germany
- International
Center for Advanced Studies of Energy Conversion, Georg-August University Goettingen, Tammannstraße 6, Goettingen 37077, Germany
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8
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Borodin D, Hertl N, Park GB, Schwarzer M, Fingerhut J, Wang Y, Zuo J, Nitz F, Skoulatakis G, Kandratsenka A, Auerbach DJ, Schwarzer D, Guo H, Kitsopoulos TN, Wodtke AM. Quantum effects in thermal reaction rates at metal surfaces. Science 2022; 377:394-398. [PMID: 35862529 DOI: 10.1126/science.abq1414] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
There is wide interest in developing accurate theories for predicting rates of chemical reactions that occur at metal surfaces, especially for applications in industrial catalysis. Conventional methods contain many approximations that lack experimental validation. In practice, there are few reactions where sufficiently accurate experimental data exist to even allow meaningful comparisons to theory. Here, we present experimentally derived thermal rate constants for hydrogen atom recombination on platinum single-crystal surfaces, which are accurate enough to test established theoretical approximations. A quantum rate model is also presented, making possible a direct evaluation of the accuracy of commonly used approximations to adsorbate entropy. We find that neglecting the wave nature of adsorbed hydrogen atoms and their electronic spin degeneracy leads to a 10× to 1000× overestimation of the rate constant for temperatures relevant to heterogeneous catalysis. These quantum effects are also found to be important for nanoparticle catalysts.
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Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - Nils Hertl
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - G Barratt Park
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany.,Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA
| | - Michael Schwarzer
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany
| | - Jan Fingerhut
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany
| | - Yingqi Wang
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Junxiang Zuo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Florian Nitz
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany
| | - Georgios Skoulatakis
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - Alexander Kandratsenka
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - Daniel J Auerbach
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM 87131, USA
| | - Theofanis N Kitsopoulos
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany.,Department of Chemistry, University of Crete, 71003 Heraklion, Greece.,Institute of Electronic Structure and Laser, FORTH, 71110 Heraklion, Greece
| | - Alec M Wodtke
- Institute for Physical Chemistry, University of Göttingen, Tammannstraße 6, 37077 Göttingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Multidisciplinary Sciences, am Faßberg 11, 37077 Göttingen, Germany
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9
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Schwarzer M, Brehm J, Vollmer M, Jasinski J, Xu C, Zainuddin S, Fröhlich T, Schott M, Greiner A, Scheibel T, Laforsch C. Shape, size, and polymer dependent effects of microplastics on Daphnia magna. J Hazard Mater 2022; 426:128136. [PMID: 34974383 DOI: 10.1016/j.jhazmat.2021.128136] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/16/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
The effects of microplastic (MP) pollution on organisms are gaining increasing attention. To date, a variety of polymers of different shapes and sizes are used in ecotoxicology. Although polystyrene (PS) is the predominant polymer type used in effect studies, it is still unclear whether the observed effects derive from the polymer itself or from a certain particle shape and size. To elucidate whether the effects are polymer specific, we conducted a systematic study on Daphnia magna by comparing various PS-MPs to nonplastic control particles with similar properties. In chronic exposure experiments, we used PS beads (6 µm; 20 µm), fibers (Ø 3 µm, length: 75.5 µm), and fragments (5.7 µm; 17.7 µm) in two different size classes and two different concentrations (500 and 5000 particles ml-1) and in-house-produced control particles of comparable size, shape, concentration and, if possible, density. Although most PS properties did not elicit effects on the tested endpoints, we observed sublethal effects on D. magna life history and morphology for small PS beads and fragments. Interestingly, no adverse effects were detected for any of the control particles. Hence, the observed effects are polymer-specific, related to the size and shape of the polymer, and do not result from particle exposure per se.
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Affiliation(s)
| | - Julian Brehm
- Animal Ecology 1, University of Bayreuth, Bayreuth, Germany
| | | | - Julia Jasinski
- Process Biotechnology, University of Bayreuth, Bayreuth, Germany
| | - Chengzhang Xu
- Macromolecular Chemistry II, University of Bayreuth, Bayreuth, Germany
| | - Shakir Zainuddin
- Process Biotechnology, University of Bayreuth, Bayreuth, Germany
| | - Thomas Fröhlich
- Gene Center Munich, Laboratory for Functional Genome Analysis (LAFUGA), LMU München, Munich, Germany
| | | | - Andreas Greiner
- Macromolecular Chemistry II, University of Bayreuth, Bayreuth, Germany
| | - Thomas Scheibel
- Process Biotechnology, University of Bayreuth, Bayreuth, Germany
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10
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Thierbach M, Heyne E, Schwarzer M, Koch LG, Britton SL, Wildemann B. Age and Intrinsic Fitness Affect the Female Rotator Cuff Tendon Tissue. Biomedicines 2022; 10:biomedicines10020509. [PMID: 35203717 PMCID: PMC8962357 DOI: 10.3390/biomedicines10020509] [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: 01/24/2022] [Revised: 02/16/2022] [Accepted: 02/17/2022] [Indexed: 11/30/2022] Open
Abstract
The risk of the development of tendon disorders or ruptures increases with age, but it is unclear whether intrinsic fitness during lifetime might also affect tendon properties. To investigate this, a contrasting rat model of high-capacity runners (HCR with high intrinsic fitness) and low-capacity runners (LCR with low intrinsic fitness) was employed. Histological and molecular changes in rotator cuff (RC) tendons from 10 weeks old (young; HCR-10 and LCR-10) and 100 weeks old (old; HCR-100 and LCR-100) female rats were investigated. Age-dependent changes of RC tendons observed in HCR and LCR were increase of weight, decrease of tenocytes and RNA content, reduction of the wavy pattern of collagen and elastic fibers, repressed expression of Col1a1, Eln, Postn, Tnmd, Tgfb3 and Egr1 and reduction of the Col1:Col3 and Col1:Eln ratio. The LCR rats showed less physical activity, increased body weight, signs of metabolic disease and a reduced life expectancy. Their RC tendons revealed increased weight (more than age-dependent) and enlargement of the tenocyte nuclei (consistent with degenerative tendons). Low intrinsic fitness led to repressed expression of a further nine genes (Col3a1, Fbn1, Dcn, Tnc, Scx, Mkx, Bmp1, Tgfb1, Esr1) as well as the rise of the Col1:Col3 and Col1:Eln ratios (related to the lesser expression of Col3a1 and Eln). The intrinsic fitness influences the female RC tendons at least as much as age. Lower intrinsic fitness accelerates aging of RC tendons and leads to further impairment; this could result in decreased healing potential and elasticity and increased stiffness.
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Affiliation(s)
- Manuela Thierbach
- Experimental Trauma Surgery, Department of Trauma, Hand and Reconstructive Surgery, Jena University Hospital, Friedrich Schiller University Jena, 07747 Jena, Germany;
| | - Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, 07747 Jena, Germany; (E.H.); (M.S.)
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, 07747 Jena, Germany; (E.H.); (M.S.)
| | - Lauren G. Koch
- Department of Physiology and Pharmacology, The University of Toledo, Toledo, OH 43606, USA;
| | - Steven L. Britton
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA;
| | - Britt Wildemann
- Experimental Trauma Surgery, Department of Trauma, Hand and Reconstructive Surgery, Jena University Hospital, Friedrich Schiller University Jena, 07747 Jena, Germany;
- Correspondence:
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11
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Schwarzer M, Toennies JP. Erratum: “Accurate semiempirical potential energy curves for the a3Σ+-state of NaCs, KCs, and RbCs” [J. Chem. Phys. 154, 154304 (2021)]. J Chem Phys 2022; 156:069903. [DOI: 10.1063/5.0085404] [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: 11/14/2022] Open
Affiliation(s)
- M. Schwarzer
- Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 11, 37077 Göttingen, Germany
| | - J. Peter Toennies
- Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 11, 37077 Göttingen, Germany
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12
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Wilde MV, Brehm J, Schwarzer M, Stöckl JB, Laforsch C, Fröhlich T. Improving the proteome coverage of Daphnia magna - implications for future ecotoxicoproteomics studies. Proteomics 2022; 22:e2100289. [PMID: 35143708 DOI: 10.1002/pmic.202100289] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 02/02/2022] [Accepted: 02/02/2022] [Indexed: 11/09/2022]
Abstract
Aquatic pollution is an increasing problem and requires extensive research efforts to understand associated consequences and to find suitable solutions. The crustacean Daphnia is a keystone species in lacustrine ecosystems by connecting primary producers with higher trophic levels. Therefore, Daphnia is perfectly suitable to investigate biological effects of freshwater pollution and is frequently used as an important model organism in ecotoxicology. The field of ecotoxicoproteomics has become increasingly prevalent, as proteins are important for an organism's physiology and respond rapidly to changing environmental conditions. However, one obstacle in proteome analysis of Daphnia is highly abundant proteins like vitellogenin, decreasing the analytical depth of proteome analysis. To improve proteome coverage in Daphnia, we established an easy-to-use procedure based on the LC-MS/MS of whole daphnids and the dissected Daphnia gut, which is the main tissue getting in contact with soluble and particulate pollutants, separately. Using a comprehensive spectral library, generated by gas-phase fractionation and a data-independent acquisition method, we identified 4621 and 5233 protein groups at high confidence (false discovery rate < 0.01) in Daphnia and Daphnia gut samples, respectively. By combining both datasets, a proteome coverage of 6027 proteins was achieved, demonstrating the effectiveness of our approach. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Magdalena V Wilde
- Gene Center Munich, Laboratory for Functional Genome Analysis (LAFUGA), LMU München, Feodor-Lynen-Straße 25, Munich, 81377, Germany
| | - Julian Brehm
- University of Bayreuth, Animal Ecology 1, Universitätsstraße 30, Bayreuth, 95447, Germany
| | - Michael Schwarzer
- University of Bayreuth, Animal Ecology 1, Universitätsstraße 30, Bayreuth, 95447, Germany
| | - Jan B Stöckl
- Gene Center Munich, Laboratory for Functional Genome Analysis (LAFUGA), LMU München, Feodor-Lynen-Straße 25, Munich, 81377, Germany
| | - Christian Laforsch
- University of Bayreuth, Animal Ecology 1, Universitätsstraße 30, Bayreuth, 95447, Germany
| | - Thomas Fröhlich
- Gene Center Munich, Laboratory for Functional Genome Analysis (LAFUGA), LMU München, Feodor-Lynen-Straße 25, Munich, 81377, Germany
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13
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Heyne E, Musleh R, Koch LG, Britton SL, Doenst T, Schwarzer M. Aging Is Not Related to Increased Cardiac Mitochondrial ROS Production in a Rat Model of Genetically Determined High or Low Exercise Capacity. Thorac Cardiovasc Surg 2022. [DOI: 10.1055/s-0042-1742786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- E. Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Deutschland
| | | | - L. G. Koch
- Department of Physiology and Pharmacology, The University of Toledo College of Medicine and Life Sciences, Toledo, Ohio, United States
| | - S. L. Britton
- Department of Anesthesiology, University of Michigan, Ann Arbor, Michigan, United States
| | - T. Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Deutschland
| | - M. Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Deutschland
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14
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Färber G, Alscher L, Heyne E, Doenst T, Schwarzer M. Scientific Publishing Differences between Sexes in Cardiology, Cardiac, and General Surgery. Thorac Cardiovasc Surg 2021; 70:143-151. [PMID: 34894637 DOI: 10.1055/s-0041-1740046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND Research and scientific publications are important for the advancement of science but also for the individual career development. While women have become the majority of students in medicine we do not know about female presence and scientific activity in cardiac surgery. We thus aimed to compare scientific output of women and men in German University departments of cardiac surgery with cardiology departments focusing on the same organ and surgical departments not addressing the heart (general surgery) of 34 universities in Germany. METHODS Personnel working at University departments was identified on the institutions internet homepage in 2014. Publications in 2011 to 2013 on PubMed were identified. Author and manuscript characteristics were determined. RESULTS A lower proportion of women were working in cardiac surgery (25%) compared with cardiology (35%) and general (32%) surgery independent of executive function or academic degree. Scientifically active women published fewer manuscripts per capita than men both, in total and as first author. Additionally, the mean and the cumulated journal impact factor of the journals chosen was lower for women compared with men in cardiology but not in cardiac and general surgery. CONCLUSION We conclude that the differences in scientific activity between women and men are more pronounced in cardiology compared with general and cardiac surgery, indicating that a higher proportion of women in a field does not result in reduced differences between sexes. The low number of women together with the lower number of manuscripts in cardiac surgery may render the appointment of women as directors challenging.
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Affiliation(s)
- Gloria Färber
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Thüringen, Germany
| | - Leonhard Alscher
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Thüringen, Germany
| | - Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Thüringen, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Thüringen, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Thüringen, Germany
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15
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Borodin D, Rahinov I, Galparsoro O, Fingerhut J, Schwarzer M, Golibrzuch K, Skoulatakis G, Auerbach DJ, Kandratsenka A, Schwarzer D, Kitsopoulos TN, Wodtke AM. Kinetics of NH 3 Desorption and Diffusion on Pt: Implications for the Ostwald Process. J Am Chem Soc 2021; 143:18305-18316. [PMID: 34672570 PMCID: PMC8569812 DOI: 10.1021/jacs.1c09269] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We report accurate time-resolved measurements of NH3 desorption from Pt(111) and Pt(332) and use these results to determine elementary rate constants for desorption from steps, from (111) terrace sites and for diffusion on (111) terraces. Modeling the extracted rate constants with transition state theory, we find that conventional models for partition functions, which rely on uncoupled degrees of freedom (DOFs), are not able to reproduce the experimental observations. The results can be reproduced using a more sophisticated partition function, which couples DOFs that are most sensitive to NH3 translation parallel to the surface; this approach yields accurate values for the NH3 binding energy to Pt(111) (1.13 ± 0.02 eV) and the diffusion barrier (0.71 ± 0.04 eV). In addition, we determine NH3's binding energy preference for steps over terraces on Pt (0.23 ± 0.03 eV). The ratio of the diffusion barrier to desorption energy is ∼0.65, in violation of the so-called 12% rule. Using our derived diffusion/desorption rates, we explain why established rate models of the Ostwald process incorrectly predict low selectivity and yields of NO under typical reactor operating conditions. Our results suggest that mean-field kinetics models have limited applicability for modeling the Ostwald process.
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Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Igor Rahinov
- Department of Natural Sciences, The Open University of Israel, 4353701 Raanana, Israel
| | - Oihana Galparsoro
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain.,Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, P.K. 1072 Donostia-San Sebastián, Spain
| | - Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Kai Golibrzuch
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Georgios Skoulatakis
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Daniel J Auerbach
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Alexander Kandratsenka
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Theofanis N Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,Department of Chemistry, University of Crete, 71003 Heraklion, Greece.,Institute of Electronic Structure and Laser - FORTH, 71110 Heraklion, Greece
| | - Alec M Wodtke
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,International Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
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16
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Singerer I, Gruen K, Schrepper A, Baez L, Schwarzer M, Bauer R, Jung C, Berndt A, Schulze PC, Franz M. Crucial role of extra-domain A containing fibronectin for the development of pulmonary hypertension and associated right heart failure. Eur Heart J 2021. [DOI: 10.1093/eurheartj/ehab724.3420] [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
Pulmonary vascular and right ventricular myocardial remodelling are unique phenomena in PH progression. Both processes are accompanied by an abundant re-expression of the extra-domain A of fibronectin (ED-A+ Fn) therefore qualifying as promising biomarker or even therapeutic target. Nevertheless, its functional role in PH pathogenesis remains unclear until now. Objective: The purpose of our study was to analyse the development of PH and RHF in a mouse model of monocrotaline (MCT)-induced PH comparing C57BL/6 ED-A+ Fn knockout (KO) and wild-type (WT) mice.
Methods
PH was induced by subcutaneous injection of a single dose of MCT (60 mg/kg body weight). Subgroups were additionally treated with the dual endothelin receptor antagonist Macitentan (MAC, 15mg/kg body weight per day from day 14 to 28). There were 6 experimental groups: sham-treated control WT mice (WTco, n=4); MCT induced PH WT mice (WTPH, n=6); MCT induced PH WT mice treated with MAC (WTPH_MAC, n=6); sham-treated control KO mice (KOco, n=4); MCT induced PH KO mice (KOPH, n=6); MCT induced PH KO mice treated with MAC (KOPH_MAC, n=6). Between day 26 and 28, transthoracic echocardiography and right heart catheterization were performed. Both, lung and cardiac tissue samples were subjected to histological analyses.
Results
Right heart catheterization revealed significantly increased RVPsys values in WTPH (87.0±16.4mmHg) compared to WTco (36.1±9.4mmHg; p=0.034) animals, which showed, at least in trend, a diminution in the WTPH_MAC group (67.1±20.9mmHg; p=n.s.). There was a non-significant increase in RVPsys in the KOPH (55.6±14.9mmHg) compared to KOco mice (37.2±5.6mmHg; p=n.s.) without any differences compared to the KOPH_MAC group (60.9±14.0mmHg; p=n.s.). When comparing the WTPH and the KOPH group, RVPsys was significantly lower in the KO animals (p=0.014), while there were no differences between the WTPH_MAC and the KOPH_MAC group (p=n.s.). Echocardiographic evaluation including surrogate parameters of right ventricular (RV) overload and failure were significantly altered in WTPH compared to WTco animals (p<0.05) and could not be shown to be relevantly improved in the WTPH_MAC group (p=n.s.). The majority of echocardiographic parameters did not significantly differ between the KOPH and the KOco group (p=n.s.). Lung tissue analysis revealed significant alterations in both, the WTPH and the KOPH group, each compared to the corresponding control (p<0.05). The level of lung tissue damage was significantly decreased in KOPH compared to WTPH mice (p<0.05). In RV, the amount of interstitial fibrosis was increased in the WTPH (p=0.009) but not in the KOPH group (p=n.s.), each compared to the corresponding controls.
Conclusions
The findings of the current study underline the hypothesis that ED-A+ Fn is a key player in the pathogenesis of PH and associated RHF. Thus, it might represent a promising therapeutic target, e.g., by the administration of neutralizing antibodies.
Funding Acknowledgement
Type of funding sources: Public hospital(s). Main funding source(s): University Hospital Jena
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Affiliation(s)
- I Singerer
- University Hospital Jena, Department of Internal Medicine I, Jena, Germany
| | - K Gruen
- University Hospital Jena, Department of Internal Medicine I, Jena, Germany
| | - A Schrepper
- University Hospital Jena, Department of Cardiothoracic Surgery, Jena, Germany
| | - L Baez
- University Hospital Jena, Department of Internal Medicine I, Jena, Germany
| | - M Schwarzer
- University Hospital Jena, Department of Cardiothoracic Surgery, Jena, Germany
| | - R Bauer
- University Hospital Jena, Institute of Molecular Cell Biology, Jena, Germany
| | - C Jung
- Heinrich-Heine-University, Department of Internal Medicine, Division of Cardiology, Pulmonology and Vascular Medicine, Düsseldorf, Germany
| | - A Berndt
- University Hospital of Jena, Institut of Legal Medicine, Section of Pathology, Jena, Germany
| | - P C Schulze
- University Hospital Jena, Department of Internal Medicine I, Jena, Germany
| | - M Franz
- University Hospital Jena, Department of Internal Medicine I, Jena, Germany
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17
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Steibl S, Sigl R, Blaha S, Drescher S, Gebauer G, Gürkal E, Hüftlein F, Satzger A, Schwarzer M, Seidenath D, Welfenbach J, Zinser RS, Laforsch C. Allochthonous resources are less important for faunal communities on highly productive, small tropical islands. Ecol Evol 2021; 11:13128-13138. [PMID: 34646457 PMCID: PMC8495779 DOI: 10.1002/ece3.8035] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 07/30/2021] [Accepted: 08/04/2021] [Indexed: 11/11/2022] Open
Abstract
Ecosystems are interconnected by energy fluxes that provide resources for the inhabiting organisms along the transition zone. Especially where in situ resources are scarce, ecosystems can become highly dependent on external resources. The dependency on external input becomes less pronounced in systems with elevated in situ production, where only consumer species close to the site of external input remain subsidized, whereas species distant to the input site rely on the in situ production of the ecosystem. It is largely unclear though if this pattern is consistent over different consumer species and trophic levels in one ecosystem, and whether consumer species that occur both proximate to and at a distance from the input site differ in their dependency on external resource inputs between sites. Using stable isotope analysis, we investigated the dependency on external marine input for common ground-associated consumer taxa on small tropical islands with high in situ production. We show that marine input is only relevant for strict beach-dwelling taxa, while the terrestrial vegetation is the main carbon source for inland-dwelling taxa. Consumer species that occurred both close (beach) and distant (inland) to the site of marine input showed similar proportions of marine input in their diets. This supports earlier findings that the relevance of external resources becomes limited to species close to the input site in systems with sufficient in situ production. However, it also indicates that the relevance of external input is also species-dependent, as consumers occurring close and distant to the input site depended equally strong or weak on marine input.
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Affiliation(s)
- Sebastian Steibl
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Robert Sigl
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Sanja Blaha
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Sophia Drescher
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Gerhard Gebauer
- BayCEER—Laboratory of Isotope BiogeochemistryUniversity of BayreuthBayreuthGermany
| | - Elif Gürkal
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Frederic Hüftlein
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Anna Satzger
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Michael Schwarzer
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Dimitri Seidenath
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Jana Welfenbach
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Raphael S. Zinser
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
| | - Christian Laforsch
- Department Animal Ecology I and BayCEERUniversity of BayreuthBayreuthGermany
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18
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Fingerhut J, Borodin D, Schwarzer M, Skoulatakis G, Auerbach DJ, Wodtke AM, Kitsopoulos TN. The Barrier for CO 2 Functionalization to Formate on Hydrogenated Pt. J Phys Chem A 2021; 125:7396-7405. [PMID: 34427437 DOI: 10.1021/acs.jpca.1c04833] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Understanding heterogeneous catalysis is based on knowing the energetic stability of adsorbed reactants, intermediates, and products as well as the energetic barriers separating them. We report an experimental determination of the barrier to CO2 functionalization to form bidentate formate on a hydrogenated Pt surface and the corresponding reaction energy. This determination was possible using velocity resolved kinetics, which simultaneously provides information about both the dynamics and rates of surface chemical reactions. In these experiments, a pulse of isotopically labeled formic acid (DCOOH) doses the Pt surface rapidly forming bidentate formate (DCO*O*). We then record the (much slower) rate of decomposition of DCO*O* to form adsorbed D* and gas phase CO2. We establish the reaction mechanism by dosing with O2 to form adsorbed O*, which efficiently converts H* or D* to gas phase water. H2O is formed immediately reflecting rapid loss of the acidic proton associated with formation of formate, while D2O formation proceeds more slowly and on the same time scale as the CO2 production. The temperature dependence of the reaction rate yields an activation energy that reflects the energy of the transition state with respect to DCO*O*. The derived heat of formation for DCO*O* on Pt(111) agrees well with results of microcalorimetry. The maximum release of translational energy of the formed CO2 provides a measure of the energy of the transition state with respect to the products and the barrier to the reverse process, functionalization of CO2. The comparison between the results on Pt(111) and Pt(332) shows that the barrier for CO2 functionalization is reduced by the presence of steps. The approach taken here could provide a method to optimize catalysts for CO2 functionalization.
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Affiliation(s)
- Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Georgios Skoulatakis
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Daniel J Auerbach
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Alec M Wodtke
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,International Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Theofanis N Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,Department of Chemistry, University of Crete, 70013 Heraklion, Greece.,Institute of Electronic Structure and Laser, FORTH, 70013 Heraklion, Greece
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19
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Borodin D, Schwarzer M, Hahn HW, Fingerhut J, Wang Y, Auerbach DJ, Guo H, Schroeder J, Kitsopoulos TN, Wodtke AM. The puzzle of rapid hydrogen oxidation on Pt(111). Mol Phys 2021. [DOI: 10.1080/00268976.2021.1966533] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
| | - Hinrich W. Hahn
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
| | - Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
| | - Yingqi Wang
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM, USA
| | - Daniel J. Auerbach
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, NM, USA
| | - Joerg Schroeder
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
| | - Theofanis N. Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- Department of Chemistry, University of Crete, Heraklion, Greece
- Institute of Electronic Structure and Laser-FORTH, Heraklion, Greece
| | - Alec M. Wodtke
- Institute for Physical Chemistry, Georg-August University of Göttingen, Göttingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany
- International Center for Advanced Studies of Energy Conversion, Göttingen, Germany
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20
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Schwarzer M, Molis A, Schenkl C, Schrepper A, Britton SL, Koch LG, Doenst T. Genetically determined exercise capacity affects systemic glucose response to insulin in rats. Physiol Genomics 2021; 53:395-405. [PMID: 34297615 DOI: 10.1152/physiolgenomics.00014.2021] [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] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Aerobic exercise capacity is inversely related to morbidity and mortality as well as to insulin resistance. However, exercising in patients has led to conflicting results, presumably because aerobic exercise capacity consists of intrinsic (genetically determined) and extrinsic (environmentally determined) parts. The contribution of both parts to insulin sensitivity is also not clear. We investigated sedentary and exercised (aerobic interval training) high (HCR) and low capacity runners (LCR) differing in their genetically determined aerobic exercise capacity to determine the contribution of both parts to insulin sensitivity. METHODS AND RESULTS LCR and HCR differed in their untrained exercise capacity and body weight. Sedentary LCR displayed a diabetic phenotype with higher random glucose, lower glucose infusion rate during hyperinsulinemic euglycemic clamping than HCR. Echocardiography showed equal morphological and functional parameters and no change with exercise. Four weeks of exercise caused significant improvements in aerobic exercise capacity, which was more pronounced in LCR. However, with respect to glucose use, exercise affected HCR only. In these animals, exercise increased 2-deoxyglucose uptake in gastrocnemius (+58.5 %, p= 0.1) and in epididymal fat (+106 %; p<0.05). Citrate synthase activity also increased in these tissues (gastrocnemius 69 % epididymal fat 63 %). CONCLUSION In our model of HCR and LCR, genetic predisposition for low exercise capacity is associated with impaired insulin sensitivity and impedes exercise-induced improvements in insulin response. Our results suggest that genetic predisposition for low aerobic exercise capacity impairs insulin response, which may not be overcome by exercise.
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Affiliation(s)
- Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Annika Molis
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Christina Schenkl
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Andrea Schrepper
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Steven L Britton
- Department of Anesthesiology, Department of Molecular and Integrative Physiology, University of Michigan-Ann Arbor, Ann Arbor, Michigan, United States
| | - Lauren Gerard Koch
- Department of Physiology and Pharmacology, College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio, United States
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
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21
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Borodin D, Rahinov I, Fingerhut J, Schwarzer M, Hörandl S, Skoulatakis G, Schwarzer D, Kitsopoulos TN, Wodtke AM. NO Binding Energies to and Diffusion Barrier on Pd Obtained with Velocity-Resolved Kinetics. J Phys Chem C Nanomater Interfaces 2021; 125:11773-11781. [PMID: 34276859 PMCID: PMC8279706 DOI: 10.1021/acs.jpcc.1c02965] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/10/2021] [Indexed: 06/13/2023]
Abstract
We report nitric oxide (NO) desorption rates from Pd(111) and Pd(332) surfaces measured with velocity-resolved kinetics. The desorption rates at the surface temperatures from 620 to 800 K span more than 3 orders of magnitude, and competing processes, like dissociation, are absent. Applying transition state theory (TST) to model experimental data leads to the NO binding energy E 0 = 1.766 ± 0.024 eV and diffusion barrier D T = 0.29 ± 0.11 eV on the (111) terrace and the stabilization energy for (110)-steps ΔE ST = 0.060-0.030 +0.015 eV. These parameters provide valuable benchmarks for theory.
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Affiliation(s)
- Dmitriy Borodin
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Igor Rahinov
- Department
of Natural Sciences, The Open University
of Israel, 4353701 Raanana, Israel
| | - Jan Fingerhut
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Michael Schwarzer
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Stefan Hörandl
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Georgios Skoulatakis
- Department
of Dynamics at Surfaces, Max Planck Institute
for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Dirk Schwarzer
- Department
of Dynamics at Surfaces, Max Planck Institute
for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Theofanis N. Kitsopoulos
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
- Department
of Chemistry, University of Crete, Heraklion, Greece
- Institute
of Electronic Structure and Laser − FORTH, Heraklion, Greece
| | - Alec M. Wodtke
- Institute
for Physical Chemistry, Georg-August University
of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department
of Dynamics at Surfaces, Max Planck Institute
for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
- International
Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
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Abstract
A five parameter semiempirical Tang-Toennies type model is used to describe the potential curves of the a3Σ+-state of the heteronuclear polar molecules NaCs, KCs, and RbCs. These molecules are of current interest in experiments at ultra-cold conditions to explore the effects of the strong dipole-dipole forces on the collective many-body quantum behavior. New quantum phenomena are also anticipated in systems consisting of atomic species with different fermion/boson statistics. The model parameters are obtained by simultaneously fitting all five of the parameters to the extensive LIF-Fourier transform spectroscopy published by Tiemann and collaborators [e.g., Docenko et al. J. Phys. B: At., Mol. Opt. Phys. 39, S929-S943 (2006)], who also report best fit potential curves. Although the new potentials are in good agreement with the earlier potentials, they have the advantage that they are continuous over the entire range of internuclear distances and have the correct long-range behavior. The scattering lengths for all isotope combinations show good agreement with dedicated experiments where available. The new potentials are also in excellent agreement with combining rules based on the potentials of the homonuclear systems.
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Affiliation(s)
- Michael Schwarzer
- Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 11, 37077 Göttingen, Germany
| | - J Peter Toennies
- Max Planck Institute for Dynamics and Self-Organization, Am Fassberg 11, 37077 Göttingen, Germany
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Mangner N, Garbade J, Heyne E, van den Berg M, Winzer EB, Hommel J, Sandri M, Jozwiak-Nozdrzykowska J, Meyer AL, Lehmann S, Schmitz C, Malfatti E, Schwarzer M, Ottenheijm CAC, Bowen TS, Linke A, Adams V. Molecular Mechanisms of Diaphragm Myopathy in Humans With Severe Heart Failure. Circ Res 2021; 128:706-719. [PMID: 33535772 DOI: 10.1161/circresaha.120.318060] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Norman Mangner
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
| | - Jens Garbade
- Department of Cardiac Surgery (J.G., S.L.), Heart Center Leipzig - University Hospital, Germany
| | - Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Germany (E.H., M.S.)
| | | | - Ephraim B Winzer
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
| | - Jennifer Hommel
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
| | - Marcus Sandri
- Department of Cardiology (M.S., J.J.-N.), Heart Center Leipzig - University Hospital, Germany
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Germany (E.H., M.S.)
| | | | - Anna L Meyer
- Cardiac Surgery, Heart and Marfan Center, University of Heidelberg, Germany (A.L.M.)
| | - Sven Lehmann
- Department of Cardiac Surgery (J.G., S.L.), Heart Center Leipzig - University Hospital, Germany
| | - Clara Schmitz
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
| | - Edoardo Malfatti
- Neurology, Centre de Référence Maladies Neuromusculaires Nord-Est-Ile-de-France, CHU Raymond-Poincaré, Garches, France (E.M.). U1179 UVSQ-INSERM, Université Versailles-Saint-Quentin-en-Yvelines, France
| | | | - Coen A C Ottenheijm
- Physiology, Amsterdam UMC (location VUmc), the Netherlands (M.v.d.B., C.A.C.O.)
| | - T Scott Bowen
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, United Kingdom (T.S.B.)
| | - Axel Linke
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
- Dresden Cardiovascular Research Institute and Core Laboratories GmbH, Dresden, Germany (A.L., V.A.)
| | - Volker Adams
- Department of Internal Medicine and Cardiology (N.M., E.B.W., J.H., C.S., A.L. V.A.), Herzzentrum Dresden, Technische Universität Dresden, Germany
- Dresden Cardiovascular Research Institute and Core Laboratories GmbH, Dresden, Germany (A.L., V.A.)
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Schenkl C, Schwarzer M, Schwarz M, Ackermann P, Schrepper A, Heyne E, Koch LG, Britton SL, Doenst T. High Intrinsic Exercise Capacity Is Associated with Reduced Survival in a Rat Model of Pressure Overload. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schwarzer M, Zeeb S, Heyne E, Färber G, Koch LG, Britton SL, Doenst T. High Aerobic Exercise Capacity Predicts Increased Mitochondrial Response to Exercise Training. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Schrepper A, Schwarzer M, Doenst T. Sex-Specific Differences in Septic Outcome: Does Mitochondrial Function Play A Role? Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Heyne E, Färber G, Britton SL, Koch LG, Doenst T, Schwarzer M. Early-Skeletal Muscle Mitochondrial Impairment Is Associated with Reduced Life Expectancy in Rats with Low Intrinsic Exercise Capacity. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Reimann G, Gerlini R, Spielmann N, Heyne E, Szibor M, Gailus-Durner V, Komlodi T, Gnaiger E, De Angelis MH, Doenst T, Schwarzer M. Defect in Complex III of the Mitochondrial Electron Transfer System Affects Cardiac Insulin Sensitivity but Not Contractile Function. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bamberger A, Szibor M, Gellerich FN, Doenst T, Schwarzer M. Contractile Function Is Regulated by Regulation of Pyruvate Supply. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Doenst T, Schwarzer M. Commentary: The morbidity of "perfect surgery"-moving the lab bench closer to the operating table. J Thorac Cardiovasc Surg 2020; 164:e310-e311. [PMID: 33454102 DOI: 10.1016/j.jtcvs.2020.12.009] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 12/02/2020] [Accepted: 12/02/2020] [Indexed: 11/26/2022]
Affiliation(s)
- Torsten Doenst
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, University Hospital, Jena, Germany.
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, University Hospital, Jena, Germany
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31
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Borodin D, Golibrzuch K, Schwarzer M, Fingerhut J, Skoulatakis G, Schwarzer D, Seelemann T, Kitsopoulos T, Wodtke AM. Measuring Transient Reaction Rates from Nonstationary Catalysts. ACS Catal 2020; 10:14056-14066. [PMID: 33343999 PMCID: PMC7737234 DOI: 10.1021/acscatal.0c03773] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 08/29/2020] [Revised: 11/06/2020] [Indexed: 11/28/2022]
Abstract
![]()
Up
to now, methods
for measuring rates of reactions on catalysts required long measurement
times involving signal averaging over many experiments. This imposed
a requirement that the catalyst return to its original state at the
end of each experiment—a complete reversibility requirement.
For real catalysts, fulfilling the reversibility requirement is often
impossible—catalysts under reaction conditions may change their
chemical composition and structure as they become activated or while
they are being poisoned through use. It is therefore desirable to
develop high-speed methods where transient rates can be quickly measured
while catalysts are changing. In this work, we present velocity-resolved
kinetics using high-repetition-rate pulsed laser ionization and high-speed
ion imaging detection. The reaction is initiated by a single molecular
beam pulse incident at the surface, and the product formation rate
is observed by a sequence of pulses produced by a high-repetition-rate
laser. Ion imaging provides the desorbing product flux (reaction rate)
as a function of reaction time for each laser pulse. We demonstrate
the principle of this approach by rate measurements on two simple
reactions: CO desorption from and CO oxidation on the 332 facet of
Pd. This approach overcomes the time-consuming scanning of the delay
between CO and laser pulses needed in past experiments and delivers
a data acquisition rate that is 10–1000 times higher. We are
able to record kinetic traces of CO2 formation while a
CO beam titrates oxygen atoms from an O-saturated surface. This approach
also allows measurements of reaction rates under diffusion-controlled
conditions.
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Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Kai Golibrzuch
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Georgios Skoulatakis
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Thomas Seelemann
- LaVision GmbH, Anna-Vandenhoeck-Ring 19, 37081 Goettingen, Germany
| | - Theofanis Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
- Department of Chemistry, University of Crete, 70013 Heraklion, Greece
- Institute of Electronic Structure and Laser—FORTH, 70013 Heraklion, Greece
| | - Alec M. Wodtke
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
- International Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
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Schwarzer M, Zeeb S, Heyne E, Koch L, Britton S, Doenst T. High aerobic exercise capacity predicts increased mitochondrial response to exercise training. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3607] [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
Low exercise capacity is a strong predictor of all-cause cardiovascular mortality and morbidity. In contrast, high exercise capacity is protective and “physical fitness” is considered beneficial. These effects seem to be mediated through mitochondrial function. Importantly, exercise capacity consists of an intrinsic (genetic) and an extrinsic (exercise, environmental) part. In humans, these two parts cannot be truly separated. The rat model of high (HCR) and low (LCR) capacity runners allows to distinguish between the two parts. We assessed mitochondrial function in this model, specifically investigating the impact of exercise training on mitochondrial respiratory capacity.
HCR and LCR were divided into control and exercised groups. Exercise capacity was determined individually using a ramped test. Animals were trained five times a week for four weeks on a treadmill. Mitochondria were isolated from heart, M. gastrocnemius and liver. Citrate synthase activity and protein content were determined photometrically and respiratory capacity was measured using a Clark-type electrode.
At the same age and tibia length, LCR-C were heavier and had a lower heart to body weight ratio than HCR-C. Citrate synthase activity was lower in skeletal muscle of LCR but cardiac citrate synthase was not different between sedentary HCR and LCR. Respiratory capacity in heart and liver was not different between sedentary HCR and LCR but was lower in skeletal muscle in LCR compared to HCR with all selected substrates (glutamate: 86,0±17,6 vs. 63,7±8,0; succinate: 203±19 vs. 136±17 nAO/min/mg Protein). Exercise training led to an increase in body weight in HCR but did not change body weight in LCR. Similarly, gastrocnemius and soleus weights only increased with exercise in HCR. Exercise led to an increase in citrate synthase activity in hearts of HCR (0,78±0,07 vs. 1,58±0,45 U/mg Protein) but not of LCR. Consistently, mitochondrial respiratory capacity was found increased in HCR with exercise in heart with all substrates (glutamate: 261±43 vs. 305±35; succinate 417±32 vs. 539±65 nAO/min/mg Protein). Liver was not affected by exercise.
Conclusion
Our data suggest that genetic predisposition for aerobic capacity additionally affects the response of mitochondria to exercise. Thus, it may be possible that the “born runner” benefits more from aerobic exercise training than the “less genetically equipped counterpart”.
Funding Acknowledgement
Type of funding source: None
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Affiliation(s)
- M Schwarzer
- Friedrich Schiller University Jena, Department of Cardiothoracic Surgery, Jena, Germany
| | - S Zeeb
- Friedrich Schiller University Jena, Department of Cardiothoracic Surgery, Jena, Germany
| | - E Heyne
- Friedrich Schiller University Jena, Department of Cardiothoracic Surgery, Jena, Germany
| | - L.G Koch
- University Toledo Medical Center, Department of Physiology and Pharmacology, Toledo, United States of America
| | - S.L Britton
- University of Michigan, Department of Anesthesiology, Ann Arbor, United States of America
| | - T Doenst
- Friedrich Schiller University Jena, Department of Cardiothoracic Surgery, Jena, Germany
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Affiliation(s)
- Michael Schwarzer
- Max-Planck-Institut für Dynamik und Selbstorganisation, Am Fassberg 17, 37077 Göttingen, Germany
| | - J. Peter Toennies
- Max-Planck-Institut für Dynamik und Selbstorganisation, Am Fassberg 17, 37077 Göttingen, Germany
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Gellerich FN, Szibor M, Gizatullina Z, Lessmann V, Schwarzer M, Doenst T, Vielhaber S, Kunz WS. Reply to Rutter et al.: The roles of cytosolic and intramitochondrial Ca 2+ and the mitochondrial Ca 2+-uniporter (MCU) in the stimulation of mammalian oxidative phosphorylation. J Biol Chem 2020; 295:10507. [PMID: 32709761 PMCID: PMC7383391 DOI: 10.1074/jbc.rl120.014342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Frank N Gellerich
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany
- Leibniz-Institute for Neurobiology, D-39120, Magdeburg, Germany
| | - Marten Szibor
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Zemfira Gizatullina
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany
- Leibniz-Institute for Neurobiology, D-39120, Magdeburg, Germany
| | - Volkmar Lessmann
- Institute of Physiology, Otto-von-Guericke-University, Magdeburg, Germany
- Center for Behavioral Brain Sciences (CBBS), Magdeburg, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - Stefan Vielhaber
- Department of Neurology, Otto-von-Guericke-University, Magdeburg, Germany
- German Center for Neurodegenerative Diseases, Magdeburg, Germany
| | - Wolfram S Kunz
- Institute of Experimental Epileptology and Cognition Research, University of Bonn, Bonn, Germany
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Heyne E, Schrepper A, Doenst T, Schenkl C, Kreuzer K, Schwarzer M. High-fat diet affects skeletal muscle mitochondria comparable to pressure overload-induced heart failure. J Cell Mol Med 2020; 24:6741-6749. [PMID: 32363733 PMCID: PMC7299710 DOI: 10.1111/jcmm.15325] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/02/2020] [Accepted: 04/03/2020] [Indexed: 01/01/2023] Open
Abstract
In heart failure, high-fat diet (HFD) may exert beneficial effects on cardiac mitochondria and contractility. Skeletal muscle mitochondrial dysfunction in heart failure is associated with myopathy. However, it is not clear if HFD affects skeletal muscle mitochondria in heart failure as well. To induce heart failure, we used pressure overload (PO) in rats fed normal chow or HFD. Interfibrillar mitochondria (IFM) and subsarcolemmal mitochondria (SSM) from gastrocnemius were isolated and functionally characterized. With PO heart failure, maximal respiratory capacity was impaired in IFM but increased in SSM of gastrocnemius. Unexpectedly, HFD affected mitochondria comparably to PO. In combination, PO and HFD showed additive effects on mitochondrial subpopulations which were reflected by isolated complex activities. While PO impaired diastolic as well as systolic cardiac function and increased glucose tolerance, HFD did not affect cardiac function but decreased glucose tolerance. We conclude that HFD and PO heart failure have comparable effects leading to more severe impairment of IFM. Glucose tolerance seems not causally related to skeletal muscle mitochondrial dysfunction. The additive effects of HFD and PO may suggest accelerated skeletal muscle mitochondrial dysfunction when heart failure is accompanied with a diet containing high fat.
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Affiliation(s)
- Estelle Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Andrea Schrepper
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Christina Schenkl
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Katrin Kreuzer
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital - Friedrich Schiller University of Jena, Jena, Germany
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Szibor M, Gizatullina Z, Gainutdinov T, Endres T, Debska-Vielhaber G, Kunz M, Karavasili N, Hallmann K, Schreiber F, Bamberger A, Schwarzer M, Doenst T, Heinze HJ, Lessmann V, Vielhaber S, Kunz WS, Gellerich FN. Cytosolic, but not matrix, calcium is essential for adjustment of mitochondrial pyruvate supply. J Biol Chem 2020; 295:4383-4397. [PMID: 32094224 PMCID: PMC7135991 DOI: 10.1074/jbc.ra119.011902] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/19/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondrial oxidative phosphorylation (OXPHOS) and cellular workload are tightly balanced by the key cellular regulator, calcium (Ca2+). Current models assume that cytosolic Ca2+ regulates workload and that mitochondrial Ca2+ uptake precedes activation of matrix dehydrogenases, thereby matching OXPHOS substrate supply to ATP demand. Surprisingly, knockout (KO) of the mitochondrial Ca2+ uniporter (MCU) in mice results in only minimal phenotypic changes and does not alter OXPHOS. This implies that adaptive activation of mitochondrial dehydrogenases by intramitochondrial Ca2+ cannot be the exclusive mechanism for OXPHOS control. We hypothesized that cytosolic Ca2+, but not mitochondrial matrix Ca2+, may adapt OXPHOS to workload by adjusting the rate of pyruvate supply from the cytosol to the mitochondria. Here, we studied the role of malate-aspartate shuttle (MAS)-dependent substrate supply in OXPHOS responses to changing Ca2+ concentrations in isolated brain and heart mitochondria, synaptosomes, fibroblasts, and thymocytes from WT and MCU KO mice and the isolated working rat heart. Our results indicate that extramitochondrial Ca2+ controls up to 85% of maximal pyruvate-driven OXPHOS rates, mediated by the activity of the complete MAS, and that intramitochondrial Ca2+ accounts for the remaining 15%. Of note, the complete MAS, as applied here, included besides its classical NADH oxidation reaction the generation of cytosolic pyruvate. Part of this largely neglected mechanism has previously been described as the “mitochondrial gas pedal.” Its implementation into OXPHOS control models integrates seemingly contradictory results and warrants a critical reappraisal of metabolic control mechanisms in health and disease.
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Affiliation(s)
- Marten Szibor
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland.,Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Zemfira Gizatullina
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany.,Leibniz-Institute for Neurobiology, D-39120 Magdeburg, Germany
| | - Timur Gainutdinov
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany.,Leibniz-Institute for Neurobiology, D-39120 Magdeburg, Germany.,Research Institute for Problems of Ecology and Mineral Wealth Use, Tatarstan Academy of Sciences, Kazan 420087, Russia
| | - Thomas Endres
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland
| | | | - Matthias Kunz
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany
| | - Niki Karavasili
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany
| | - Kerstin Hallmann
- Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Frank Schreiber
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany.,German Center for Neurodegenerative Diseases, D-39120 Magdeburg, Germany
| | - Alexandra Bamberger
- Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Michael Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Hans-Jochen Heinze
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany.,German Center for Neurodegenerative Diseases, D-39120 Magdeburg, Germany.,Center for Behavioral Brain Sciences (CBBS), D-39120 Magdeburg, Germany
| | - Volkmar Lessmann
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland.,Center for Behavioral Brain Sciences (CBBS), D-39120 Magdeburg, Germany
| | - Stefan Vielhaber
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany.,German Center for Neurodegenerative Diseases, D-39120 Magdeburg, Germany
| | - Wolfram S Kunz
- Department of Cardiothoracic Surgery, Jena University Hospital, D-07747 Jena, Germany
| | - Frank N Gellerich
- Department of Neurology, Otto-von-Guericke-University, D-39120 Magdeburg, Germany .,Leibniz-Institute for Neurobiology, D-39120 Magdeburg, Germany
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Marx J, Schwarzer M, Schenkl C, Koch LG, Britton SL, Doenst T. Genetic Predisposition for High- or Low-Exercise Capacity Does Not Affect the Detrimental Impact of Sepsis in Rats. Thorac Cardiovasc Surg 2020. [DOI: 10.1055/s-0040-1705333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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38
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Heyne E, Färber G, Walther O, Kirov H, Freiburger S, Doenst T, Schwarzer M. Mitochondrial Function in Human Heart Failure is Dependent on Etiology, Severity, and the Presence of Diabetes. Thorac Cardiovasc Surg 2020. [DOI: 10.1055/s-0040-1705354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Kumar S, Jiang H, Schwarzer M, Kandratsenka A, Schwarzer D, Wodtke AM. Vibrational Relaxation Lifetime of a Physisorbed Molecule at a Metal Surface. Phys Rev Lett 2019; 123:156101. [PMID: 31702291 DOI: 10.1103/physrevlett.123.156101] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Indexed: 06/10/2023]
Abstract
Previous measurements of vibrational relaxation lifetimes for molecules adsorbed at metal surfaces yielded values of 1-3 ps; however, only chemisorbed molecules have been studied. We report the first measurements of the vibrational relaxation lifetime of a molecule physisorbed to a metal surface. For CO(v=1) adsorbed on Au(111) at 35 K the vibrational lifetime of the excited stretching mode is 49±3 ps. The long lifetime seen here is likely to be a general feature of physisorption, which involves weaker electronic coupling between the adsorbate and the solid due to bonding at larger distances.
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Affiliation(s)
- Sumit Kumar
- Department of Dynamics at Surfaces, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Hongyan Jiang
- Department of Dynamics at Surfaces, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Michael Schwarzer
- Institute of Aerodynamics and Flow technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073 Göttingen, Germany
| | - Alexander Kandratsenka
- Department of Dynamics at Surfaces, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Alec M Wodtke
- Department of Dynamics at Surfaces, Max-Planck-Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
- Institute for Physical Chemistry, University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
- International Center for Advanced Studies of Energy Conversion, Georg-August University of Göttingen, Tammannstrasse 6, 37077 Göttingen, Germany
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Schwarzer M, Doenst T, Des Rosiers C, Glatz JF. The power of metabolism — Linking energy supply and demand with cardiac contractile function. Biochim Biophys Acta Mol Basis Dis 2019; 1865:725-727. [DOI: 10.1016/j.bbadis.2019.02.006] [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: 11/16/2022]
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Piscopo CG, Voellinger L, Schwarzer M, Polyzoidis A, Bošković D, Loebbecke S. Continuous Flow Desulfurization of a Model Fuel Catalysed by Titanium Functionalized UiO‐66. ChemistrySelect 2019. [DOI: 10.1002/slct.201900342] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- C. G. Piscopo
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
| | - L. Voellinger
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
| | - M. Schwarzer
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
| | - A. Polyzoidis
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
| | - D. Bošković
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
| | - S. Loebbecke
- Energetic Materials DepartmentFraunhofer Institute for Chemical Technology ICT Joseph-von-Fraunhofer-Str. 7 D- 76327 Pfinztal Germany
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Schwarzer M, Schenkl C, Böhle S, Schrepper A, Britton S, Koch L, Doenst T. Influence of Exercise Capacity on Tolerance of Ischemia Reperfusion or Pressure Overload. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M. Schwarzer
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - C. Schenkl
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - S. Böhle
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - A. Schrepper
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - S.L. Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, United States
| | - L.G. Koch
- Department of Physiology & Pharmacology, The University of Toledo, Toledo, United States
| | - T. Doenst
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
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Faerber G, Heyne E, Kirov H, Jacoub K, Schwarzer M, Doenst T. Mechanical Unloading of the Human Left Ventricle Reduces Maximal Respiratory Chain Capacity but Optimizes ATP Producing Machinery. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- G. Faerber
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - E. Heyne
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - H. Kirov
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - K. Jacoub
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - M. Schwarzer
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - T. Doenst
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
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Heyne E, Schwarzer M, Schenkl C, Kreuzer K, Schrepper A, Doenst T. Detrimental Effects of Metformin on Mitochondrial Function in Healthy Rats. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- E. Heyne
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - M. Schwarzer
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - C. Schenkl
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - K. Kreuzer
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - A. Schrepper
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
| | - T. Doenst
- Jena University Hospital, Cardiothoracic Surgery, Jena, Germany
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Schwarzer M, Zeeb S, Heyne E, Koch L, Britton L, Doenst T. Differences in Skeletal and Heart Muscle Mitochondrial Function in Response to Intrinsic and Acquired Exercise Capacity. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M. Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - S. Zeeb
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - E. Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - L.G. Koch
- Department of Physiology and Pharmacology, The University of Toledo, Toledo, United States
| | - L. Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, United States
| | - T. Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
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Faerber G, Heyne E, Schwarzer M, Doenst T. Mitochondrial Function of the Failing Human Heart Shows Regional Differences. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1679019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- G. Faerber
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - E. Heyne
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - M. Schwarzer
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
| | - T. Doenst
- Department of Cardiothoracic Surgery, Friedrich-Schiller-University Jena, Jena, Germany
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Schenkl C, Schrepper A, Gonzalez-Lopez D, Wanjek D, Schwarzer M, Doenst T. IGF-1 Receptor Inhibition Causes Reversible Cardiac Atrophy and Contractile Dysfunction. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- C. Schenkl
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - A. Schrepper
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - D. Gonzalez-Lopez
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - D. Wanjek
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - M. Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - T. Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
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Heyne E, Schwarzer M, Zeeb S, Koch L, Britton L, Doenst T. Differential Effects of Exercise on Interfibrillar and Subsarcolemmal Skeletal Muscle Mitochondria. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- E. Heyne
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - M. Schwarzer
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - S. Zeeb
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
| | - L.G. Koch
- Department of Physiology and Pharmacology, The University of Toledo, Toledo, United States
| | - L. Britton
- Department of Anesthesiology, University of Michigan Medical School, Ann Arbor, United States
| | - T. Doenst
- Department of Cardiothoracic Surgery, Jena University Hospital, Jena, Germany
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Schwarzer M. Regulation of Animal Research in Science: How to Harm Both Science and Animal Protection. Thorac Cardiovasc Surg 2018; 67:502. [PMID: 30452074 DOI: 10.1055/s-0038-1675379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Michael Schwarzer
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
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Schwarzer M, Alscher L, Doenst T. Comparison of Scientific Publications from Three Different Clinical Disciplines of German Universities. Thorac Cardiovasc Surg 2018; 67:488-493. [PMID: 29954032 DOI: 10.1055/s-0038-1661004] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
BACKGROUND Scientific publications are important for the advancement in medicine. Surgical disciplines including cardiac surgery are frequently considered not scientifically leading. However, a specific comparison between surgical and nonsurgical disciplines has not yet been performed. We thus compared scientific output of German departments of cardiac surgery with nonsurgical cardiology departments and surgical departments not addressing the heart (general surgery) of 34 universities in Germany. METHODS For each university, the personnel working at the different departments were identified on the internet homepage in 2014. We searched for publications of these persons in 2011 to 2013 on PubMed, identified author position, coauthors, and type of article, as well as journal impact factor (JIF). RESULTS There were 931 academic persons in cardiac surgery, 1,486 in general surgery, and 1,814 in cardiology with 12,096 publications related to these persons on PubMed. Cardiology published most manuscripts, including manuscripts from research conducted (first author), initiated (senior author), or both. Cardiac surgery had the least publications and had fewer authors from other departments or institutions. The average JIF was higher in cardiology compared with the two surgical disciplines. However, relating the number of publications to the number of employees in the departments, the differences were no longer apparent. CONCLUSION We conclude that the number of publications in German universities appears to be a function of the number of academic personnel and not of the discipline. The lower JIFs in surgery may be due to the smaller surgical fields and/or due to less high impact interdisciplinary/interinstitutional publications in surgery.
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Affiliation(s)
- Michael Schwarzer
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
| | - Leonhard Alscher
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
| | - Torsten Doenst
- Department of Cardiothoracic Surgery, University Hospital Jena, Jena, Germany
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