1
|
Stumpf J, Anders L, Siepmann T, Schwöbel J, Karger C, Lindner T, Faulhaber-Walter R, Langer T, Escher K, Anding-Rost K, Seidel H, Hüther J, Pistrosch F, Martin H, Schewe J, Stehr T, Meistring F, Paliege A, Schneider D, Bast I, Steglich A, Gembardt F, Kessel F, Kröger H, Arndt P, Sradnick J, Frank K, Skrzypczyk S, Anft M, Klimova A, Mauer R, Roeder I, Tonn T, Babel N, Hugo C. 9-Month observational Dia-Vacc study of vaccine type influence on SARS-CoV-2 immunity in dialysis and kidney transplant patients. Vaccine 2024; 42:120-128. [PMID: 38114410 DOI: 10.1016/j.vaccine.2023.12.034] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 12/05/2023] [Accepted: 12/09/2023] [Indexed: 12/21/2023]
Abstract
BACKGROUND SARS-CoV-2mRNA vaccination related seroconversion rates are reduced in dialysis and kidney transplant patients. METHODS We evaluated nine months follow up data in our observational Dia-Vacc study exploring specific cellular (interferon-γ release assay) or/and humoral immune responses after 2x SARS-CoV-2mRNA vaccination in 880 participants including healthy medical personnel (125-MP), dialysis patients (595-DP), kidney transplant recipients (111-KTR), and apheresis patients (49-AP) with positive seroconversion (de novo IgA or IgG antibody positivity by ELISA) after eight weeks. FINDINGS Nine months after first vaccination, receptor binding domain (RBD) antibodies were still positive in 90 % of MP, 86 % of AP, but only 55 %/48 % of DP/KTR, respectively. Seroconversion remained positive in 100 % of AP and 99·2 % of MP, but 86 %/81 % of DP/KTR, respectively. Compared to MP, DP but not KTR or AP were at risk for a strong RBD decline, while KTR kept lowest RBD values over time. By multivariate analysis, BNT162b2mRNA versus 1273-mRNA vaccine type was an independent risk factor for a strong decline of RBD antibodies. Within the DP group, only time on dialysis was another (inverse) risk factor for the DP group. Compared to humoral immunity, T-cell immunity decline was less prominent. INTERPRETATION While seroconverted KTR reach lowest RBD values over time, DP are at specific risk for a strong decline of RBD antibodies after successful SARS-CoV-2mRNA vaccination, which also depends on the vaccine type being used. Therefore, booster vaccinations for DP should be considered earlier compared to normal population.
Collapse
Affiliation(s)
- Julian Stumpf
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; KfH-Nierenzentrum Dresden, Dresden, Germany
| | | | - Torsten Siepmann
- KfH-Nierenzentrum am Klinikum Chemnitz, Krankenhaus Küchwald, Chemnitz, Germany
| | | | - Claudia Karger
- KfH-Nierenzentrum am Klinikum St. Georg, Leipzig, Germany
| | - Tom Lindner
- Division of Nephrology, University Hospital Leipzig, Leipzig, Germany
| | | | | | - Katja Escher
- KfH-Gesundheitszentrum Aue, Aue-Bad-Schlema, Germany
| | | | - Harald Seidel
- KfH-Nierenzentrum am Vogtland Krankenhaus Plauen, Plauen, Germany
| | | | | | - Heike Martin
- Nephrologisches Zentrum Zwickau, Zwickau, Germany
| | - Jens Schewe
- Dialyse- und Nierenambulanz Sebnitz, Sebnitz, Germany
| | | | - Frank Meistring
- KfH-Nierenzentrum am Städtischen Klinikum Görlitz, Görlitz, Germany
| | - Alexander Paliege
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Daniel Schneider
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | | | - Anne Steglich
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Florian Gembardt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Friederike Kessel
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Hannah Kröger
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Patrick Arndt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jan Sradnick
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Kerstin Frank
- Institut für Transfusionsmedizin Plauen, DRK-Blutspendedienst Nord-Ost gemeinnützige GmbH, Plauen, Germany
| | - Sarah Skrzypczyk
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
| | - Moritz Anft
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
| | - Anna Klimova
- National Center for Tumor Diseases (NCT) Partner Site Dresden, Dresden, Germany
| | - René Mauer
- Faculty of Medicine Carl Gustav Carus, Institute for Medical Informatics and Biometry (IMB), Technische Universität, Dresden, Germany
| | - Ingo Roeder
- Faculty of Medicine Carl Gustav Carus, Institute for Medical Informatics and Biometry (IMB), Technische Universität, Dresden, Germany
| | - Torsten Tonn
- Institute for Transfusion Medicine, German Red Cross Blood Donation Service North-East, Dresden, Germany; Faculty of Medicine Carl Gustav Carus, Transfusion Medicine, Technische Universität, Dresden, Germany
| | - Nina Babel
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany; Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin-Brandenburg Center for Regenerative Therapies, and Institute of Medical Immunology, Germany
| | - Christian Hugo
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany; KfH-Nierenzentrum Dresden, Dresden, Germany.
| |
Collapse
|
2
|
Namazian Jam N, Gottlöber F, Hempel M, Dzekhtsiarova Y, Behrens S, Sonntag F, Sradnick J, Hugo C, Schmieder F. Microphysiological Conditions Do Not Affect MDR1-Mediated Transport of Rhodamine 123 above an Artificial Proximal Tubule. Biomedicines 2023; 11:2045. [PMID: 37509683 PMCID: PMC10376999 DOI: 10.3390/biomedicines11072045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/15/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
Despite disadvantages, such as high cost and their poor predictive value, animal experiments are still the state of the art for pharmaceutical substance testing. One reason for this problem is the inability of standard cell culture methods to emulate the physiological environment necessary to recapitulate in vivo processes. Microphysiological systems offer the opportunity to close this gap. In this study, we utilize a previously employed microphysiological system to examine the impact of pressure and flow on the transportation of substances mediated by multidrug resistance protein 1 (MDR1) across an artificial cell-based tubular barrier. By using a miniaturized fluorescence measurement device, we could continuously track the MDR1-mediated transport of rhodamine 123 above the artificial barrier over 48 h. We proved that applying pressure and flow affects both active and passive transport of rhodamine 123. Using experimental results and curve fittings, the kinetics of MDR1-mediated transport as well as passive transport were investigated; thus, a kinetic model that explains this transport above an artificial tubular barrier was identified. This kinetic model demonstrates that the simple Michaelis-Menten model is not an appropriate model to explain the MDR1-mediated transport; instead, Hill kinetics, with Hill slope of n = 2, is a better fit. The kinetic values, Km, Vmax, and apparent permeability (Papp), obtained in this study are comparable with other in vivo and in vitro studies. Finally, the presented proximal tubule-on-a-chip can be used for pharmaceutical substance testing and to investigate pharmacokinetics of the renal transporter MDR1.
Collapse
Affiliation(s)
- Negin Namazian Jam
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Felix Gottlöber
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Melanie Hempel
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Yuliya Dzekhtsiarova
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Stephan Behrens
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Frank Sonntag
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| | - Jan Sradnick
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, 01307 Dresden, Germany
| | - Christian Hugo
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, 01307 Dresden, Germany
| | - Florian Schmieder
- Fraunhofer Institute for Material and Beam Technology IWS, 01277 Dresden, Germany
| |
Collapse
|
3
|
Arndt P, Sradnick J, Kroeger H, Holtzhausen S, Kessel F, Gerlach M, Todorov V, Hugo C. A quantitative 3D intravital look at the juxtaglomerular renin-cell-niche reveals an individual intra/extraglomerular feedback system. Front Physiol 2022; 13:980787. [PMID: 36237522 PMCID: PMC9550881 DOI: 10.3389/fphys.2022.980787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/01/2022] [Indexed: 11/13/2022] Open
Abstract
The juxtaglomerular niche occupied by renin cells (RCN) plays an important role in glomerular repair but the precise temporal and spatial interrelations remain unclear. This study proposes the hypothesis of a local intra-extraglomerular regenerative feedback system and establishes a new quantifiable system for RCN responses in individual glomeruli in vivo. A strictly intraglomerular two-photon laser-induced injury model was established. Labeled renin cells (RC) in transgenic renin reporter mice were fate-traced in healthy and injured glomeruli over several days by intravital microscopy and quantified via new three-dimensional image processing algorithms based on ray tracing. RC in healthy glomeruli demonstrated dynamic extraglomerular protrusions. Upon intraglomerular injury the corresponding RCN first increased in volume and then increased in area of dynamic migration up to threefold compared to their RCN. RC started migration reaching the site of injury within 3 hours and acquired a mesangial cell phenotype without losing physical RCN-contact. During intraglomerular repair only the corresponding RCN responded via stimulated neogenesis, a process of de novo differentiation of RC to replenish the RCN. Repeated continuous intravital microscopy provides a state-of-the-art tool to prove and further study the local intraglomerular RCN repair feedback system in individual glomeruli in vivo in a quantifiable manner.
Collapse
Affiliation(s)
- Patrick Arndt
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Jan Sradnick
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Hannah Kroeger
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Stefan Holtzhausen
- Institute of Machine Elements and Machine Design, Chair of Virtual Product Development, Dresden University of Technology, Dresden, Germany
| | - Friederike Kessel
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Michael Gerlach
- Core Facility Cellular Imaging, Experimental Center, Faculty of Medicine Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Vladimir Todorov
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
| | - Christian Hugo
- Experimental Nephrology, Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden University of Technology, Dresden, Germany
- *Correspondence: Christian Hugo,
| |
Collapse
|
4
|
Kroeger H, Kessel F, Sradnick J, Todorov V, Gembardt F, Hugo C. Intravital imaging of hemodynamic glomerular effects of enalapril or/and empagliflozin in STZ-diabetic mice. Front Physiol 2022; 13:982722. [PMID: 36171965 PMCID: PMC9511053 DOI: 10.3389/fphys.2022.982722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 08/19/2022] [Indexed: 11/23/2022] Open
Abstract
Background: Diabetic kidney disease is the leading cause of end-stage renal disease. Administration of ACE inhibitors or/and SGLT2 inhibitors show renoprotective effects in diabetic and other kidney diseases. The underlying renoprotective mechanisms of SGLT2 inhibition, especially in combination with ACE inhibition, are incompletely understood. We used longitudinal intravital microscopy to directly elucidate glomerular hemodynamics on a single nephron level in response to the ACE inhibitor enalapril or/and the SGLT2 inhibitor empagliflozin. Methods: Five weeks after the induction of diabetes by streptozotocin, male C57BL/6 mice were treated with enalapril, empagliflozin, enalapril/empagliflozin or placebo for 3 days. To identify hemodynamic regulation mechanisms, longitudinal intravital multiphoton microscopy was employed to measure single nephron glomerular filtration rate (snGFR) and afferent/efferent arteriole width. Results: Diabetic mice presented a significant hyperfiltration. Compared to placebo treatment, snGFR was reduced in response to enalapril, empagliflozin, or enalapril/empagliflozin administration under diabetic conditions. While enalapril treatment caused significant dilation of the efferent arteriole (12.55 ± 1.46 µm vs. control 11.92 ± 1.04 µm, p < 0.05), empagliflozin led to a decreased afferent arteriole diameter (11.19 ± 2.55 µm vs. control 12.35 ± 1.32 µm, p < 0.05) in diabetic mice. Unexpectedly under diabetic conditions, the combined treatment with enalapril/empagliflozin had no effects on both afferent and efferent arteriole diameter change. Conclusion: SGLT2 inhibition, besides ACE inhibition, is an essential hemodynamic regulator of glomerular filtration during diabetes mellitus. Nevertheless, additional mechanisms—independent from hemodynamic regulation—are involved in the nephroprotective effects especially of the combination therapy and should be further explored in future studies.
Collapse
|
5
|
Stumpf J, Siepmann T, Schwöbel J, Glombig G, Paliege A, Steglich A, Gembardt F, Kessel F, Kröger H, Arndt P, Sradnick J, Frank K, Klimova A, Mauer R, Tonn T, Hugo C. MMF/MPA Is the Main Mediator of a Delayed Humoral Response With Reduced Antibody Decline in Kidney Transplant Recipients After SARS-CoV-2 mRNA Vaccination. Front Med (Lausanne) 2022; 9:928542. [PMID: 35872777 PMCID: PMC9300891 DOI: 10.3389/fmed.2022.928542] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 06/07/2022] [Indexed: 01/14/2023] Open
Abstract
Kidney transplant recipients (KTR) show significantly lower seroconversion rates after SARS-CoV-2 mRNA vaccination compared to dialysis patients (DP). Mycophenolate mofetil or mycophenolic acid (MMF/MPA) in particular has been identified as a risk factor for seroconversion failure. While the majority of all KTR worldwide receive MMF/MPA for immunosuppressive therapy, its impact on antibody decline in seroconverted KTR still remains unclear. In an observational study (NCT04799808), we investigated whether 132 seroconverted KTR (anti-spike S1 IgG or IgA positive after 2 vaccinations) show a more rapid antibody decline with MMF/MPA than those without this medication. A total of 2 months after mRNA vaccination, average anti-spike S1 IgG levels of KTR with MMF/MPA were lower than without (p = 0.001), while no differences between these two groups were observed after 6 months (p = 0.366). Similar results were obtained for anti-RBD IgG antibodies (T2 p = 0.003 and T3 p = 0.135). The probability of severe IgG decline with MMF/MPA was three times lower than without (p = 0.003, OR 0.236, 95% CI 0.091-0.609). In the multivariate analysis, neither immunosuppressants, such as calcineurin inhibitors, mTOR inhibitors (mTOR-I; mechanistic target of rapamycin), glucocorticoids, nor vaccine type, sex, or age showed a significant influence on IgG titer decline between 2 and 6 months. For the decision on additional booster vaccinations, we consider immunosurveillance to be needed as an integral part of renal transplant follow-up after SARS-CoV-2 mRNA vaccination. Not only the lack of seroconversion but also the peak and titer decline of the specific IgG and RBD IgG antibody formation after two mRNA vaccinations is significantly influenced by MMF/MPA.
Collapse
Affiliation(s)
- Julian Stumpf
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,KfH-Nierenzentrum Dresden, Dresden, Germany
| | - Torsten Siepmann
- KfH-Nierenzentrum am Klinikum Chemnitz, Krankenhaus Küchwald, Chemnitz, Germany
| | | | - Grit Glombig
- KfH-Nierenzentrum am Klinikum St. Georg, Leipzig, Germany
| | - Alexander Paliege
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Anne Steglich
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Florian Gembardt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Friederike Kessel
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Hannah Kröger
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Patrick Arndt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jan Sradnick
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Kerstin Frank
- Institut für Transfusionsmedizin Plauen, DRK-Blutspendedienst Nord-Ost gemeinnützige GmbH, Plauen, Germany
| | - Anna Klimova
- National Center for Tumor Diseases (NCT) Dresden, Dresden, Germany
| | - René Mauer
- Faculty of Medicine Carl Gustav Carus, Institute for Medical Informatics and Biometry (IMB), Technische Universität Dresden, Dresden, Germany
| | - Torsten Tonn
- Institute for Transfusion Medicine, German Red Cross Blood Donation Service North-East, Dresden, Germany.,Faculty of Medicine Carl Gustav Carus, Transfusion Medicine, Technische Universität Dresden, Dresden, Germany
| | - Christian Hugo
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,KfH-Nierenzentrum Dresden, Dresden, Germany
| |
Collapse
|
6
|
Stumpf J, Schwöbel J, Lindner T, Anders L, Siepmann T, Karger C, Hüther J, Martin H, Müller P, Faulhaber-Walter R, Langer T, Schirutschke H, Stehr T, Meistring F, Pietzonka A, Anding-Rost K, Escher K, Pistrosch F, Schewe J, Seidel H, Barnett K, Pluntke T, Cerny S, Paliege A, Bast I, Steglich A, Gembardt F, Kessel F, Kröger H, Arndt P, Sradnick J, Frank K, Klimova A, Mauer R, Grählert X, Tonn T, Hugo C. Risk of strong antibody decline in dialysis and transplant patients after SARS-CoV-2mRNA vaccination: Six months data from the observational Dia-Vacc study. Lancet Reg Health Eur 2022; 17:100371. [PMID: 35434688 PMCID: PMC8995854 DOI: 10.1016/j.lanepe.2022.100371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Background Vulnerable dialysis and kidney transplant patients show impaired seroconversion rates compared to medical personnel eight weeks after SARS-CoV-2mRNA vaccination. Methods We evaluated six months follow up data in our observational Dia-Vacc study exploring specific cellular (interferon-γ release assay) or/and humoral immune responses after 2x SARS-CoV-2mRNA vaccination in 1205 participants including medical personnel (125 MP), dialysis patients (970 DP) and kidney transplant recipients (110 KTR) with seroconversion (de novo IgA or IgG antibody positivity by ELISA) after eight weeks. Findings Six months after vaccination, seroconversion remained positive in 98% of MP, but 91%/87% of DP/KTR (p = 0·005), respectively. Receptor binding domain-IgG (RBD-IgG) antibodies were positive in 98% of MP, but only 68%/57% of DP/KTR (p < 0·001), respectively. Compared to MP, DP and KTR were at risk for a strong IgG or RBD-IgG decline (p < 0·001). Within the DP but not KTR group male gender, peritoneal dialysis, short time on dialysis, BNT162b2mRNA vaccine, immunosuppressive drug use and diabetes mellitus were independent risk factors for a strong decline of IgG or RBD antibodies. The percentage of cellular immunity decline was similar in all groups. Interpretation Both vulnerable DP and KTR groups are at risk for a strong decline for IgG and RBD antibodies. In KTR, antibody titres peak at a markedly lower level and accelerated antibody decline is mixed with a delayed/increasing IgG, RBD-IgG, or cellular immune response in a 16% fraction of patients. In both populations, immune monitoring should be used for early timing of additional booster vaccinations. Funding This study was funded by the Else Kröner Fresenius Stiftung, Bad Homburg v. d. H., grant number Fördervertrag EKFS 2021_EKSE.27.
Collapse
|
7
|
Pistrosch F, Matschke JB, Schipp D, Schipp B, Henkel E, Weigmann I, Sradnick J, Bornstein SR, Birkenfeld AL, Hanefeld M. Rivaroxaban compared with low-dose aspirin in individuals with type 2 diabetes and high cardiovascular risk: a randomised trial to assess effects on endothelial function, platelet activation and vascular biomarkers. Diabetologia 2021; 64:2701-2712. [PMID: 34495376 PMCID: PMC8563606 DOI: 10.1007/s00125-021-05562-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Accepted: 06/22/2021] [Indexed: 02/08/2023]
Abstract
AIMS/HYPOTHESIS Individuals with type 2 diabetes mellitus and subclinical inflammation have stimulated coagulation, activated platelets and endothelial dysfunction. Recent studies with the direct factor Xa inhibitor rivaroxaban in combination with low-dose aspirin demonstrated a significant reduction of major cardiovascular events, especially in individuals with type 2 diabetes and proven cardiovascular disease. Therefore, we asked the question of whether treatment with rivaroxaban could influence endothelial function, arterial stiffness and platelet activation. METHODS We conducted a multi-centre, prospective, randomised, open-label trial in 179 participants with type 2 diabetes (duration 2-20 years), subclinical inflammation (high-sensitivity C-reactive protein 2-10 mg/l) and at least two traits of the metabolic syndrome to compare the effects of the direct factor Xa inhibitor rivaroxaban (5 mg twice daily) vs aspirin (100 mg every day) on endothelial function (assessed by forearm occlusion plethysmography), skin blood flow (assessed by laser-Doppler fluxmetry), arterial stiffness (assessed by pulse wave velocity) and serum biomarkers of endothelial function and inflammation. Furthermore, we investigated phosphorylation of vasodilator-stimulated phosphoprotein (VASP) in platelets, the concentration of platelet-derived microparticles (PMPs) and the effects of isolated PMPs on HUVEC proliferation in vitro. RESULTS Rivaroxaban treatment for 20 weeks (n = 89) resulted in a significant improvement of post-ischaemic forearm blood flow (3.6 ± 4.7 vs 1.0 ± 5.2 ml/100 ml, p = 0.004), a numerically increased skin blood flow and reduced soluble P-Selectin plasma level vs aspirin. We did not find significant differences of arterial stiffness or further biomarkers. Neither rivaroxaban nor aspirin influenced VASP phosphorylation of platelets. The number of PMPs increased significantly with both rivaroxaban (365.2 ± 372.1 vs 237.4 ± 157.1 μl-1, p = 0.005) and aspirin (266.0 ± 212.7 vs 201.7 ± 162.7 μl-1, p = 0.021). PMPs of rivaroxaban-treated participants stimulated HUVEC proliferation in vitro compared with aspirin. Rivaroxaban was associated with a higher number of bleeding events. CONCLUSIONS/INTERPRETATION Our findings indicate that the direct factor Xa inhibitor rivaroxaban improved endothelial function in participants with type 2 diabetes and subclinical inflammation but also increased the risk of bleeding. TRIAL REGISTRATION ClinicalTrials.gov NCT02164578. FUNDING The study was supported by a research grant from Bayer Vital AG, Germany.
Collapse
Affiliation(s)
- Frank Pistrosch
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany.
| | - Jan B Matschke
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
| | | | - Bernhard Schipp
- Faculty of Business and Economics, Department of Quantitative Methods, TU-Dresden, Dresden, Germany
| | | | - Ingo Weigmann
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
| | - Jan Sradnick
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
| | - Stefan R Bornstein
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
| | - Andreas L Birkenfeld
- Internal Medicine IV, Universitätsklinikum Tuebingen, Tuebingen, Germany
- Institute of Diabetes Research and Metabolic Diseases of the Helmholtz Centre Munich, Tuebingen, Germany
| | - Markolf Hanefeld
- Medical Clinic III, Universitätsklinikum 'Carl Gustav Carus', Dresden, Germany
| |
Collapse
|
8
|
Stumpf J, Tonnus W, Paliege A, Rettig R, Steglich A, Gembardt F, Kessel F, Kröger H, Arndt P, Sradnick J, Frank K, Tonn T, Hugo C. Cellular and Humoral Immune Responses After 3 Doses of BNT162b2 mRNA SARS-CoV-2 Vaccine in Kidney Transplant. Transplantation 2021; 105:e267-e269. [PMID: 34342963 PMCID: PMC8549130 DOI: 10.1097/tp.0000000000003903] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 07/03/2021] [Indexed: 12/31/2022]
Abstract
Supplemental Digital Content is available in the text.
Collapse
Affiliation(s)
- Julian Stumpf
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- KfH-Nierenzentrum Dresden, Dresden, Germany
| | - Wulf Tonnus
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Alexander Paliege
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- KfH-Nierenzentrum Dresden, Dresden, Germany
| | - Ronny Rettig
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Anne Steglich
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Florian Gembardt
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Friederike Kessel
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Hannah Kröger
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Patrick Arndt
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jan Sradnick
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Kerstin Frank
- Institut für Transfusionsmedizin Plauen, DRK-Blutspendedienst Nord-Ost gemeinnützige GmbH, Plauen, Germany
| | - Torsten Tonn
- Institute for Transfusion Medicine, German Red Cross Blood Donation Service North-East, Dresden, Germany
- Faculty of Medicine Carl Gustav Carus, Transfusion Medicine, Technische Universität, Dresden, Germany
| | - Christian Hugo
- Medizinische Klinik und Poliklinik III, Nephrologie, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- KfH-Nierenzentrum Dresden, Dresden, Germany
| |
Collapse
|
9
|
Stumpf J, Siepmann T, Lindner T, Karger C, Schwöbel J, Anders L, Faulhaber-Walter R, Schewe J, Martin H, Schirutschke H, Barnett K, Hüther J, Müller P, Langer T, Pluntke T, Anding-Rost K, Meistring F, Stehr T, Pietzonka A, Escher K, Cerny S, Rothe H, Pistrosch F, Seidel H, Paliege A, Beige J, Bast I, Steglich A, Gembardt F, Kessel F, Kröger H, Arndt P, Sradnick J, Frank K, Klimova A, Mauer R, Grählert X, Anft M, Blazquez-Navarro A, Westhoff TH, Stervbo U, Tonn T, Babel N, Hugo C. Humoral and cellular immunity to SARS-CoV-2 vaccination in renal transplant versus dialysis patients: A prospective, multicenter observational study using mRNA-1273 or BNT162b2 mRNA vaccine. Lancet Reg Health Eur 2021; 9:100178. [PMID: 34318288 PMCID: PMC8299287 DOI: 10.1016/j.lanepe.2021.100178] [Citation(s) in RCA: 180] [Impact Index Per Article: 60.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Background Dialysis and kidney transplant patients are vulnerable populations for COVID-19 related disease and mortality. Methods We conducted a prospective study exploring the eight week time course of specific cellular (interferon-γ release assay and flow cytometry) or/and humoral immune responses (ELISA) to SARS-CoV-2 boost vaccination in more than 3100 participants including medical personnel, dialysis patients and kidney transplant recipients using mRNA vaccines BNT162b2 or mRNA-1273. Results SARS-CoV-2-vaccination induced seroconversion efficacy in dialysis patients was similar to medical personnel (> 95%), but markedly impaired in kidney transplant recipients (42%). T-cellular immunity largely mimicked humoral results. Major risk factors of seroconversion failure were immunosuppressive drug number and type (belatacept, MMF-MPA, calcineurin-inhibitors) as well as vaccine type (BNT162b2 mRNA). Seroconversion rates induced by mRNA-1273 compared to BNT162b2 vaccine were 97% to 88% (p < 0.001) in dialysis and 49% to 26% in transplant patients, respectively. Specific IgG directed against the new binding domain of the spike protein (RDB) were significantly higher in dialysis patients vaccinated by mRNA-1273 (95%) compared to BNT162b2 (85%, p < 0.001). Vaccination appeared safe and highly effective demonstrating an almost complete lack of symptomatic COVID-19 disease after boost vaccination as well as ceased disease incidences during third pandemic wave in dialysis patients. Conclusion Dialysis patients exhibit a remarkably high seroconversion rate of 95% after boost vaccination, while humoral response is impaired in the majority of transplant recipients. Immunosuppressive drug number and type as well as vaccine type (BNT162b2) are major determinants of seroconversion failure in both dialysis and transplant patients suggesting immune monitoring and adaption of vaccination protocols.
Collapse
Affiliation(s)
- Julian Stumpf
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- KfH-Nierenzentrum Dresden, Dresden, Germany
| | - Torsten Siepmann
- KfH-Nierenzentrum am Klinikum Chemnitz, Krankenhaus Küchwald, Chemnitz, Germany
| | - Tom Lindner
- Division of Nephrology, University Hospital Leipzig, Leipzig, Germany
| | - Claudia Karger
- KfH-Nierenzentrum am Klinikum St. Georg, Leipzig, Germany
| | | | | | | | - Jens Schewe
- Dialyse- und Nierenambulanz Sebnitz, Sebnitz, Germany
| | - Heike Martin
- Nephrologisches Zentrum Zwickau, Zwickau, Germany
| | | | | | | | - Petra Müller
- PHV Dialysezentrum Dresden-Johannstadt, Dresden, Germany
| | | | | | | | - Frank Meistring
- KfH-Nierenzentrum am Städtischen Klinikum Görlitz, Görlitz, Germany
| | | | | | - Katja Escher
- KfH-Gesundheitszentrum Aue, Aue-Bad-Schlema, Germany
| | - Simon Cerny
- ELBLAND Dialyse Großenhain, Großenhain, Germany
| | | | | | - Harald Seidel
- KfH-Nierenzentrum am Vogtland Krankenhaus Plauen, Plauen, Germany
| | - Alexander Paliege
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Joachim Beige
- KfH-Nierenzentrum am Klinikum St. Georg, Leipzig, Germany
- Department of Nephrology und Rheumatology, Internal Medicine II, Martin-Luther-University Halle/Wittenberg, Halle, Germany
| | | | - Anne Steglich
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Florian Gembardt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Friederike Kessel
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Hannah Kröger
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Patrick Arndt
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jan Sradnick
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Kerstin Frank
- Institut für Transfusionsmedizin Plauen, DRK-Blutspendedienst Nord-Ost gemeinnützige GmbH, Plauen, Germany
| | - Anna Klimova
- National Center for Tumor Diseases (NCT) Partner Site Dresden, Dresden, Germany
| | - René Mauer
- Faculty of Medicine Carl Gustav Carus, Institute for Medical Informatics and Biometry (IMB), Technische Universität, Dresden, Germany
| | - Xina Grählert
- Coordinating Centre for Clinical Trials, Dresden, Germany
| | - Moritz Anft
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
| | - Arturo Blazquez-Navarro
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
| | - Timm H Westhoff
- Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Herne, Germany
| | - Ulrik Stervbo
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
| | - Torsten Tonn
- Institute for Transfusion Medicine, German Red Cross Blood Donation Service North-East, Dresden, Germany
- Faculty of Medicine Carl Gustav Carus, Transfusion Medicine, Technische Universität, Dresden, Germany
| | - Nina Babel
- Center for Translational Medicine and Immune Diagnostics Laboratory, Medical Department I, Marien Hospital Herne, University Hospital of the Ruhr-University Bochum, Germany
- Berlin-Brandenburg Center for Regenerative Therapies, Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, and Institute of Medical Immunology, Germany
| | - Christian Hugo
- Medizinische Klinik und Poliklinik III, Universitätsklinikum, Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
- KfH-Nierenzentrum Dresden, Dresden, Germany
- Corresponding author at: Prof. Dr. med. Christian HugoDivision of Nephrology Department of Internal Medicine III University Hospital Carl Gustav Carus of the Technische Universität Dresden01307 Dresden Germany.
| |
Collapse
|
10
|
Abstract
Background: Intravital microscopy is an emerging technique in life science with applications in kidney research. Longitudinal observation of (patho-)physiological processes in living mice is possible in the smallest functional unit of the kidney, a single nephron (sn). In particular, effects on glomerular filtration rate (GFR) - a key parameter of renal function - can be assessed. Methods: After intravenous injection of a freely filtered, non-resorbable, fluorescent dye in C57BL/6 mice, a time series was captured by multiphoton microsopy. Filtration was observed from the glomerular capillaries to the proximal tubule (PT) and the tubular signal intensity shift was analyzed to calculate the snGFR. Results: Previously described methods for snGFR analysis relied on two manually defined measurement points in the PT and the tubular volume was merely estimated in 2D images. We present an extended image processing workflow by adding continuous measurement of intensity along the PT in every frame of the time series using ImageJ. Automatic modelling of actual PT volume in a 3D dataset replaced 2D volume estimation. Subsequent data analysis in R, with a calculation of intensity shifts in every frame and normalization against tubular volume, allowed exact assessment of snGFR by linear regression. Repeated analysis of image data obtained in healthy mice showed a striking increase of reproducibility by reduction of user interaction. Conclusions: These improvements in image processing and data analysis maximize the reliability of a sophisticated intravital microscopy technique for the precise assessment of snGFR, a highly relevant predictor of kidney function.
Collapse
Affiliation(s)
- Friederike Kessel
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Hannah Kröger
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Michael Gerlach
- Core Facility Cellular Imaging (CFCI), University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Jan Sradnick
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Florian Gembardt
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Vladimir Todorov
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| | - Christian Hugo
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Fetscherstraße 74, Dresden, 01307, Germany
| |
Collapse
|
11
|
Rodionov RN, Jarzebska N, Schneider A, Rexin A, Sradnick J, Brilloff S, Martens-Lobenhoffer J, Bode-Böger SM, Todorov V, Hugo C, Weiss N, Hohenstein B. ADMA elevation does not exacerbate development of diabetic nephropathy in mice with streptozotocin-induced diabetes mellitus. ATHEROSCLEROSIS SUPP 2020; 40:100-105. [PMID: 31818438 DOI: 10.1016/j.atherosclerosissup.2019.08.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS Cardiovascular disease is nowadays the major cause of mortality and morbidity worldwide. The risk of developing cardiovascular disease is significantly increased in patients with diabetic nephropathy. It has been suggested that asymmetric dimethylarginine (ADMA), an endogenous inhibitor of NO synthases (NOS), may play an important role in the pathogenesis of diabetic nephropathy. ADMA is mainly metabolized by dimethylarginine dimethylaminohydrolase 1 (DDAH1). The goal of this study was to test the hypothesis that elevation of systemic ADMA levels by knocking out DDAH1 would exacerbate functional and structural glomerular abnormalities in a murine model of diabetic nephropathy. METHODS Streptozotocin (STZ) was used to induce diabetes in adult DDAH1 knock-out and wild type mice. Healthy mice served as controls. Mice were sacrificed after 20 weeks of diabetes. Plasma ADMA levels were assessed by isotope-dilution tandem mass spectrometry and albumin by ELISA. Kidneys were used for FACS analysis and were also stained for markers of inflammation, cell proliferation, glomerular cells and cell matrix. RESULTS STZ led to development of diabetes mellitus in all injected animals. Deficiency of DDAH1 led to a significant increase in plasma ADMA levels in healthy and diabetic mice. The diabetic state itself did not influence systemic ADMA levels. Diabetic mice of both genotypes developed albuminuria and had increased glomerulosclerosis index. There were no changes in desmin expression, glomerular cell proliferation rate, matrix expansion and expression of Mac-2 antigen in the diabetic mice of both genotypes as compared to the healthy ones. CONCLUSIONS In summary, STZ-induced diabetes led to the development of early features of diabetic nephropathy. Deficiency of DDAH1 and subsequent increase in systemic ADMA levels did not exacerbate these changes, indicating that ADMA is not the major mediator of diabetic nephropathy in this experiment model.
Collapse
Affiliation(s)
- Roman N Rodionov
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany.
| | - Natalia Jarzebska
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany; Department of Anesthesiology and Critical Care Medicine, University Hospital Dresden, Technische Universität Dresden, Germany
| | - Alfred Schneider
- Department of Visceral Surgery, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Annett Rexin
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Silke Brilloff
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Jens Martens-Lobenhoffer
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Str.44, 39120, Magdeburg, Germany
| | - Stefanie M Bode-Böger
- Institute of Clinical Pharmacology, Otto-von-Guericke University, Leipziger Str.44, 39120, Magdeburg, Germany
| | - Vladimir Todorov
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Christian Hugo
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Norbert Weiss
- University Center for Vascular Medicine, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Fetscherstrasse 74, 01307, Dresden, Germany
| |
Collapse
|
12
|
Schmieder F, Behrens S, Reustle N, Franke N, Sonntag F, Sradnick J, Hohenstein B. A microphysiological system to investigate the pressure dependent filtration at an artificial glomerular kidney barrier. Current Directions in Biomedical Engineering 2019. [DOI: 10.1515/cdbme-2019-0098] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Chronic kidney disease (CKD) is a global health problem that affects around 11 to 13% of the world’s population and more than 18% of European citizens. Characteristic syndromes of CKD during all stages of the disease are proteinuria and ongoing glomerular dysfunction caused by cellular damages at the glomerular filtration barrier. While some rare cases of the disease are correlated to genetic depositions the majority of cases are caused by diabetes, glomerulosclerosis, high blood pressure and glomerulonephritis. Thus, recapitulating the interplay of high blood pressure and changes at the glomerular filtration barrier in vitro seems an adequate way to mimic CKD. Here we present a microphysiological system of the glomerular filter that is capable to simulate high blood pressure at the glomerular filtration barrier in vitro. It consists of a closed loop microfluidic circuit with an integrated pneumatically driven heart like micro pump that constantly circulates the cell culture media at the blood site of the glomerular barrier. The ThinCert™ insert could be reversibly integrated into a holder system that ensures the correct position of the insert within the microfluidic circuit. By using different modulations of the integrated pneumatic micro pump different physiological and pathophysiological conditions e.g. hypertonic stress, like in CKD, could be applied. The influence of hypertonic conditions on the filtration above the barrier was studied by changes of TEER values and measurement of the flux of fluorescent labelled albumin through the cellular barrier.
Collapse
Affiliation(s)
- Florian Schmieder
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden , Germany
| | - Stefan Behrens
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden , Germany
| | - Nina Reustle
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden , Germany
| | - Nathalie Franke
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden , Germany
| | - Frank Sonntag
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden , Germany
| | - Jan Sradnick
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden , Germany
| | - Bernd Hohenstein
- Department of Internal Medicine III, University Hospital Carl Gustav Carus, Dresden , Germany
| |
Collapse
|
13
|
Ruhnke L, Sradnick J, Al-Mekhlafi M, Gerlach M, Gembardt F, Hohenstein B, Todorov VT, Hugo C. Progenitor Renin Lineage Cells are not involved in the regeneration of glomerular endothelial cells during experimental renal thrombotic microangiopathy. PLoS One 2018; 13:e0196752. [PMID: 29771991 PMCID: PMC5957372 DOI: 10.1371/journal.pone.0196752] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 04/18/2018] [Indexed: 11/21/2022] Open
Abstract
Endothelial cells (EC) frequently undergo primary or secondary injury during kidney disease such as thrombotic microangiopathy or glomerulonephritis. Renin Lineage Cells (RLCs) serve as a progenitor cell niche after glomerular damage in the adult kidney. However, it is not clear whether RLCs also contribute to endothelial replenishment in the glomerulus following endothelial injury. Therefore, we investigated the role of RLCs as a potential progenitor niche for glomerular endothelial regeneration. We used an inducible tet-on triple-transgenic reporter strain mRen-rtTAm2/LC1/LacZ to pulse-label the renin-producing RLCs in adult mice. Unilateral kidney EC damage (EC model) was induced by renal artery perfusion with concanavalin/anti-concanavalin. In this model glomerular EC injury and depletion developed within 1 day while regeneration occurred after 7 days. LacZ-labelled RLCs were restricted to the juxtaglomerular compartment of the afferent arterioles at baseline conditions. In contrast, during the regenerative phase of the EC model (day 7) a subset of LacZ-tagged RLCs migrated to the glomerular tuft. Intraglomerular RLCs did not express renin anymore and did not stain for glomerular endothelial or podocyte cell markers, but for the mesangial cell markers α8-integrin and PDGFRβ. Accordingly, we found pronounced mesangial cell damage parallel to the endothelial injury induced by the EC model. These results demonstrated that in our EC model RLCs are not involved in endothelial regeneration. Rather, recruitment of RLCs seems to be specific for the repair of the concomitantly damaged mesangium.
Collapse
Affiliation(s)
- Leo Ruhnke
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Moath Al-Mekhlafi
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Michael Gerlach
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Florian Gembardt
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
| | - Vladimir T. Todorov
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
- * E-mail: (CH); (VTT)
| | - Christian Hugo
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, Dresden, Germany
- * E-mail: (CH); (VTT)
| |
Collapse
|
14
|
Sradnick J, Tselmin S, Wagner A, Julius U, Todorov V, Hugo C, Hohenstein B. H.E.L.P apheresis exerts long term effects on the capacity of circulating proangiogenic cells. ATHEROSCLEROSIS SUPP 2017; 30:232-237. [PMID: 29096843 DOI: 10.1016/j.atherosclerosissup.2017.05.045] [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: 11/29/2022]
Abstract
BACKGROUND Severe forms of mono- and polygenetic hypercholesterolemia as well as elevated Lipoprotein (a) (LP(a)) with progressing cardiovascular (CV) disease are indication for lipoprotein apheresis (LA) in Germany. Many studies investigated pleiotropic effects of LA that might contribute to beneficial effects in advanced atherosclerosis. The present study aimed at investigating the potential role of Proangiogenic Cells (PAC) in patients with new onset or chronic LA using the heparin induced extracorporeal LDL-precipitation (H.E.L.P.) apheresis system. METHODS Patients (n = 10) new to LA and HELP treatment were investigated immediately before, shortly after, 24 h later and 4 weeks following LA. Peripheral blood was used to count PAC in circulation via flow cytometry. In a second step, blood cells from patients were cultured in endothelial selective medium and further evaluated for adhesion in fibronectin coated chamber slides and migratory capacity (stromal cell-derived factor-1 (SDF-1) induced migration). RESULTS Cells expressing typical EPC markers were rarely detected in blood samples. No differences occurred over time in CD34+; CD34+ CD133+ CD45-; CD34+/KDR+ and CXCR4+/CD14+ positive PAC. We found no differences in cell adhesion at the different time points, while significantly more cells migrated into the SDF-1 medium following four weeks of continuing apheresis therapy. CONCLUSION Using well established systems, this study was not able to demonstrate relevant acute effects of LA on PAC in patients new to LA. The increased migratory capacity of PAC might be an indicator of chronic beneficial pleiotropic effects in patients undergoing H.E.L.P. apheresis.
Collapse
Affiliation(s)
- Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Sergey Tselmin
- Extracorporeal Treatment and Apheresis Center, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Andrea Wagner
- Division of Nephrology, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Ulrich Julius
- Extracorporeal Treatment and Apheresis Center, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Vladimir Todorov
- Division of Nephrology, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Christian Hugo
- Division of Nephrology, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany; Extracorporeal Treatment and Apheresis Center, Department of Internal Medicine III, University Hospital and Faculty of Medicine Carl Gustav Carus at the Technische Universität, Dresden, Germany.
| |
Collapse
|
15
|
Hickmann L, Steglich A, Gerlach M, Al-Mekhlafi M, Sradnick J, Lachmann P, Sequeira-Lopez MLS, Gomez RA, Hohenstein B, Hugo C, Todorov VT. Persistent and inducible neogenesis repopulates progenitor renin lineage cells in the kidney. Kidney Int 2017; 92:1419-1432. [PMID: 28688581 DOI: 10.1016/j.kint.2017.04.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 03/23/2017] [Accepted: 04/06/2017] [Indexed: 10/19/2022]
Abstract
Renin lineage cells (RLCs) serve as a progenitor cell reservoir during nephrogenesis and after renal injury. The maintenance mechanisms of the RLC pool are still poorly understood. Since RLCs were also identified as a progenitor cell population in bone marrow we first considered that these may be their source in the kidney. However, transplantation experiments in adult mice demonstrated that bone marrow-derived cells do not give rise to RLCs in the kidney indicating their non-hematopoietic origin. Therefore we tested whether RLCs develop in the kidney through neogenesis (de novo differentiation) from cells that have never expressed renin before. We used a murine model to track neogenesis of RLCs by flow cytometry, histochemistry, and intravital kidney imaging. During nephrogenesis RLCs first appear at e14, form a distinct population at e16, and expand to reach a steady state level of 8-10% of all kidney cells in adulthood. De novo differentiated RLCs persist as a clearly detectable population through embryogenesis until at least eight months after birth. Pharmacologic stimulation of renin production with enalapril or glomerular injury induced the rate of RLC neogenesis in the adult mouse kidney by 14% or more than three-fold, respectively. Thus, the renal RLC niche is constantly filled by local de novo differentiation. This process could be stimulated consequently representing a new potential target to beneficially influence repair and regeneration after kidney injury.
Collapse
Affiliation(s)
- Linda Hickmann
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Anne Steglich
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Michael Gerlach
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Moath Al-Mekhlafi
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Jan Sradnick
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Peter Lachmann
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | | | - R Ariel Gomez
- Department of Pediatrics, University of Virginia School of Medicine, Charlottesville, Virginia, USA
| | - Bernd Hohenstein
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Christian Hugo
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
| | - Vladimir T Todorov
- Experimental Nephrology and Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.
| |
Collapse
|
16
|
Sradnick J, Klöpfel A, Elsner N, Vedenina V. Variation in complex mating signals in an "island" hybrid zone between Stenobothrus grasshopper species. Ecol Evol 2016; 6:5057-75. [PMID: 27547333 PMCID: PMC4979727 DOI: 10.1002/ece3.2265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 03/03/2016] [Revised: 05/24/2016] [Accepted: 05/25/2016] [Indexed: 11/09/2022] Open
Abstract
Two grasshopper species Stenobothrus rubicundus and S. clavatus were previously shown to meet in a narrow hybrid zone on Mount Tomaros in northern Greece. The species are remarkable for their complex courtship songs accompanied by conspicuous movements of antennae and wings. We analyzed variations in forewing morphology, antenna shape, and courtship song across the hybrid zone using a geographic information system, and we documented three contact zones on Mount Tomaros. All male traits and female wings show abrupt transitions across the contact zones, suggesting that these traits are driven by selection rather than by drift. Male clines in antennae are displaced toward S. clavatus, whereas all clines in wings are displaced toward S. rubicundus. We explain cline discordance as depending on sexual selection via female choice. The high covariance between wings and antennae found in the centers of all contact zones results from high levels of linkage disequilibria among the underlying loci, which in turn more likely results from assortative mating than from selection against hybrids. The covariance is found to be higher in clavatus-like than rubicundus-like populations, which implies asymmetric assortative mating in parental-like sites of the hybrid zone and a movement of the hybrid zone in favor of S. clavatus.
Collapse
Affiliation(s)
- Jan Sradnick
- Department of Neurobiology Johann-Friedrich-Blumenbach-Institute Göttingen Germany; Present address: Division of Nephrology Department of Internal Medicine III Dresden University of Technology Dresden Germany
| | - Anja Klöpfel
- Department of Neurobiology Johann-Friedrich-Blumenbach-Institute Göttingen Germany
| | - Norbert Elsner
- Department of Neurobiology Johann-Friedrich-Blumenbach-Institute Göttingen Germany
| | - Varvara Vedenina
- Institute for Information Transmission Problems Russian Academy of Sciences Bolshoy Karetny per. 19 Moscow 127051 Russia
| |
Collapse
|
17
|
Sradnick J, Rong S, Luedemann A, Parmentier SP, Bartaun C, Todorov VT, Gueler F, Hugo CP, Hohenstein B. Extrarenal Progenitor Cells Do Not Contribute to Renal Endothelial Repair. J Am Soc Nephrol 2015; 27:1714-26. [PMID: 26453608 DOI: 10.1681/asn.2015030321] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 08/18/2015] [Indexed: 12/14/2022] Open
Abstract
Endothelial progenitor cells (EPCs) may be relevant contributors to endothelial cell (EC) repair in various organ systems. In this study, we investigated the potential role of EPCs in renal EC repair. We analyzed the major EPC subtypes in murine kidneys, blood, and spleens after induction of selective EC injury using the concanavalin A/anti-concanavalin A model and after ischemia/reperfusion (I/R) injury as well as the potential of extrarenal cells to substitute for injured local EC. Bone marrow transplantation (BMTx), kidney transplantation, or a combination of both were performed before EC injury to allow distinction of extrarenal or BM-derived cells from intrinsic renal cells. During endothelial regeneration, cells expressing markers of endothelial colony-forming cells (ECFCs) were the most abundant EPC subtype in kidneys, but were not detected in blood or spleen. Few cells expressing markers of EC colony-forming units (EC-CFUs) were detected. In BM chimeric mice (C57BL/6 with tandem dimer Tomato-positive [tdT+] BM cells), circulating and splenic EC-CFUs were BM-derived (tdT+), whereas cells positive for ECFC markers in kidneys were not. Indeed, most BM-derived tdT+ cells in injured kidneys were inflammatory cells. Kidneys from C57BL/6 donors transplanted into tdT+ recipients with or without prior BMTx from C57BL/6 mice were negative for BM-derived or extrarenal ECFCs. Overall, extrarenal cells did not substitute for any intrinsic ECs. These results demonstrate that endothelial repair in mouse kidneys with acute endothelial lesions depends exclusively on local mechanisms.
Collapse
Affiliation(s)
- Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Song Rong
- Division of Nephrology and Hypertension, Department of Internal Medicine, Hannover Medical School, Hannover, Germany
| | - Anika Luedemann
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Simon P Parmentier
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Christoph Bartaun
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Vladimir T Todorov
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Faikah Gueler
- Division of Nephrology and Hypertension, Department of Internal Medicine, Hannover Medical School, Hannover, Germany
| | - Christian P Hugo
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, University Hospital Carl Gustav Carus at the Technische Universität Dresden, Dresden, Germany; and
| |
Collapse
|
18
|
Engeser F, Sradnick J, Schwarzenberger C, Todorov V, Hugo C, Hohenstein B. FP183THROMBOSPONDIN-1 MEDIATES MICROVASCULAR ENDOTHELIAL INJURY IN AN MURINE MODEL OF ACUTE SITE SELECTIVE ENDOTHELIAL INJURY. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv172.11] [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: 11/12/2022] Open
|
19
|
Schwarzenberger C, Sradnick J, Lerea KM, Goligorsky MS, Nieswandt B, Hugo CPM, Hohenstein B. Platelets are relevant mediators of renal injury induced by primary endothelial lesions. Am J Physiol Renal Physiol 2015; 308:F1238-46. [PMID: 25834071 DOI: 10.1152/ajprenal.00535.2014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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: 09/26/2014] [Accepted: 03/26/2015] [Indexed: 12/23/2022] Open
Abstract
Several studies have suggested a prominent (pro)inflammatory and harmful role of platelets in renal disease, and newer work has also demonstrated platelet release of proangiogenic factors. In the present study, we investigated the role of platelets in a mouse model of selective endothelial cell injury using either platelet depletion or the pharmacological P2Y12 receptor blocker clopidogrel as an interventional strategy. The concanavalin A/anti-concanavalin A model was induced in left kidneys of C57bl/6J wild-type mice after initial platelet depletion or platelet-inhibiting therapy using clopidogrel. FACS analysis of glycoprotein IIb/IIIa/P-selectin double-positive platelets and platelet-derived microparticles demonstrated relevant platelet activation after the induction of selective endothelial injury in mice. Enhanced platelet activation persisted for 5 days after disease induction and was accompanied by increased amounts of circulating platelet-derived microparticles as potential mediators of a prolonged procoagulant state. By immunohistochemistry, we detected significantly reduced glomerular injury in platelet-depleted mice compared with control mice. In parallel, we also saw reduced endothelial loss and a consequently reduced repair response as indicated by diminished proliferative activity. The P2Y12 receptor blocker clopidogrel demonstrated efficacy in limiting platelet activation and subsequent endothelial injury in this mouse model of renal microvascular injury. In conclusion, platelets are relevant mediators of renal injury induced by primary endothelial lesions early on, as demonstrated by platelet depletion as well as platelet inhibition via the P2Y12 receptor. While strategies to prevent platelet-endothelial interactions have shown protective effects, the contribution of platelets during renal regeneration remains unknown.
Collapse
Affiliation(s)
- Claudia Schwarzenberger
- Division of Nephrology, Department of Internal Medicine III, Technische Universitaet Dresden, Dresden, Germany
| | - Jan Sradnick
- Division of Nephrology, Department of Internal Medicine III, Technische Universitaet Dresden, Dresden, Germany
| | - Kenneth M Lerea
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York
| | | | - Bernhard Nieswandt
- Rudolf Virchow Center, DFG Research Center for Experimental Biomedicine, University of Wuerzburg, Wuerzburg, Germany
| | - Christian P M Hugo
- Division of Nephrology, Department of Internal Medicine III, Technische Universitaet Dresden, Dresden, Germany
| | - Bernd Hohenstein
- Division of Nephrology, Department of Internal Medicine III, Technische Universitaet Dresden, Dresden, Germany;
| |
Collapse
|
20
|
Vedenina V, Fähsing S, Sradnick J, Klöpfel A, Elsner N. A narrow hybrid zone between the grasshoppersStenobothrus clavatusandStenobothrus rubicundus(Orthoptera: Gomphocerinae): female preferences for courtship songs. Biol J Linn Soc Lond 2013. [DOI: 10.1111/bij.12005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Varvara Vedenina
- Institute for Information Transmission Problems; Russian Academy of Sciences; Bolshoy Karetny per. 19; 127994; Moscow; Russia
| | - Sylvia Fähsing
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| | - Jan Sradnick
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| | - Anja Klöpfel
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| | - Norbert Elsner
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| |
Collapse
|
21
|
Vedenina V, Sradnick J, Klöpfel A, Elsner N. A narrow hybrid zone between the grasshoppers Stenobothrus clavatus and Stenobothrus rubicundus: courtship song analysis. Biol J Linn Soc Lond 2012. [DOI: 10.1111/j.1095-8312.2012.01935.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Varvara Vedenina
- Institute for Information Transmission Problems; Russian Academy of Sciences; Bolshoy Karetny pereulok 19; 127994; Moscow; Russia
| | - Jan Sradnick
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| | - Anja Klöpfel
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| | - Norbert Elsner
- Department of Neurobiology; Johann-Friedrich-Blumenbach-Institute; Berliner Strasse 28; D-37073; Göttingen; Germany
| |
Collapse
|