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Nguyen L, Mess C, Schneider SW, Huck V, Herberger K. In vivo characterization of laser-assisted delivery of hyaluronic acid using multiphoton fluorescence lifetime imaging. Exp Dermatol 2023; 32:2131-2137. [PMID: 37846872 DOI: 10.1111/exd.14961] [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: 08/24/2023] [Revised: 10/05/2023] [Accepted: 10/09/2023] [Indexed: 10/18/2023]
Abstract
Laser-assisted drug delivery (LADD) is a treatment method to enhance the penetration of pharmaceuticals through the skin. The aim of the present study is to track hyaluronic acid (HA) and analyse its effect on human skin in vivo after ablative fractional laser (AFL) treatment. Healthy male and female subjects were recruited. Four areas were marked on their forearms of each volunteer, and each area was assigned to one of the following treatment options: AFL + HA, AFL only, HA only or untreated control. A carbon dioxide laser was used for the AFL treatment. Follow-up measurements were scheduled 30 min and 30 days after treatment using multiphoton tomography equipped with fluorescence lifetime imaging (MPT-FLIM). A total of 11 subjects completed the study. By detecting fluorescence lifetimes, the HA and the anaesthetic ointment were clearly distinguishable from surrounding tissue. After AFL treatment, HA could be visualized in all epidermal and upper dermal layers. In contrast, HA in intact skin was only detected in the superficial layers at distinctly lower levels. The applied HA gel seemed to have beneficial properties for the wound healing process after laser treatment. LADD has proven to be a fast and effective method to increase HA uptake into the skin, allowing for improved hydration and skin rejuvenation over time. Furthermore, LADD could be a beneficial treatment option in laser resurfacing. MPT-FLIM proved to be an appropriate diagnostic tool for drug delivery tracking and monitoring of treatment response for individualized therapy adjustment.
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Affiliation(s)
- Lynhda Nguyen
- Laser Department, Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Mess
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan W Schneider
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Volker Huck
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Katharina Herberger
- Laser Department, Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Burmeister A, Vidal-y-Sy S, Liu X, Mess C, Wang Y, Konwar S, Tschongov T, Häffner K, Huck V, Schneider SW, Gorzelanny C. Impact of neutrophil extracellular traps on fluid properties, blood flow and complement activation. Front Immunol 2022; 13:1078891. [PMID: 36591269 PMCID: PMC9800590 DOI: 10.3389/fimmu.2022.1078891] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022] Open
Abstract
Introduction The intravascular formation of neutrophil extracellular traps (NETs) is a trigger for coagulation and blood vessel occlusion. NETs are released from neutrophils as a response to strong inflammatory signals in the course of different diseases such as COVID-19, cancer or antiphospholipid syndrome. NETs are composed of large, chromosomal DNA fibers decorated with a variety of proteins such as histones. Previous research suggested a close mechanistic crosstalk between NETs and the coagulation system involving the coagulation factor XII (FXII), von Willebrand factor (VWF) and tissue factor. However, the direct impact of NET-related DNA fibers on blood flow and blood aggregation independent of the coagulation cascade has remained elusive. Methods In the present study, we used different microfluidic setups in combination with fluorescence microscopy to investigate the influence of neutrophil-derived extracellular DNA fibers on blood rheology, intravascular occlusion and activation of the complement system. Results We found that extended DNA fiber networks decelerate blood flow and promote intravascular occlusion of blood vessels independent of the plasmatic coagulation. Associated with the DNA dependent occlusion of the flow channel was the strong activation of the complement system characterized by the production of complement component 5a (C5a). Vice versa, we detected that the local activation of the complement system at the vascular wall was a trigger for NET release. Discussion In conclusion, we found that DNA fibers as the principal component of NETs are sufficient to induce blood aggregation even in the absence of the coagulation system. Moreover, we discovered that complement activation at the endothelial surface promoted NET formation. Our data envisions DNA degradation and complement inhibition as potential therapeutic strategies in NET-induced coagulopathies.
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Affiliation(s)
- Antonia Burmeister
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Sabine Vidal-y-Sy
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Xiaobo Liu
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Mess
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Yuanyuan Wang
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Swagata Konwar
- Department of Internal Medicine IV, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Todor Tschongov
- Department of Internal Medicine IV, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Karsten Häffner
- Department of Internal Medicine IV, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Volker Huck
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan W. Schneider
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany,*Correspondence: Christian Gorzelanny, ; Stefan W. Schneider,
| | - Christian Gorzelanny
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany,*Correspondence: Christian Gorzelanny, ; Stefan W. Schneider,
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Nguyen L, Mess C, Schneider SW, Huck V, Herberger K. In Vivo Visualization of Tattoo Particles Using Multiphoton Tomography and Fluorescence Lifetime Imaging. Exp Dermatol 2022; 31:1712-1719. [PMID: 35837813 DOI: 10.1111/exd.14646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 06/17/2022] [Accepted: 07/12/2022] [Indexed: 11/27/2022]
Abstract
With increased popularity of decorative tattoos, awareness of tattoo-based dermatological complications has been raised. Health issues include a broad spectrum dominated by allergies and infections. To examine the etiopathology and prognose the outcome of an appropriate therapy, a non-invasive intravital diagnostic approach is indicated. The present pilot study introduces multiphoton tomography equipped with fluorescence lifetime imaging as a diagnostic technique to examine the morphological and metabolic status of tattooed human skin at patient's bedside. The distributing course of tattoo particles can be visualized over time. By providing optical biopsies, inflammation-based alterations in freshly tattooed skin and tattoo complications can be analyzed. The study concludes that multiphoton tomography combined with fluorescence lifetime imaging is a suitable technique for in vivo visualization of tattoo pigments as well as for the assessment of quantitative and qualitative skin changes after injection of tattoo ink into human skin.
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Affiliation(s)
- Lynhda Nguyen
- Laser Department, Department for Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Mess
- Department for Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan W Schneider
- Department for Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Volker Huck
- Department for Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Katharina Herberger
- Laser Department, Department for Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Schneider G, Ständer S, Kahnert S, Pereira MP, Mess C, Huck V, Agelopoulos K, Frank G, Schneider SW. Biological and psychosocial factors associated with the persistence of pruritus symptoms: protocol for a prospective, exploratory observational study in Germany (individual project of the Interdisciplinary SOMACROSS Research Unit [RU 5211]). BMJ Open 2022; 12:e060811. [PMID: 35798519 PMCID: PMC9263938 DOI: 10.1136/bmjopen-2022-060811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
INTRODUCTION Chronic pruritus (CP) is a symptom of dermatologic, neurologic, systemic and psychosomatic diseases. CP has a prevalence of ~20% in the general population and is therefore a significant burden on society, but the transition from acute pruritus to CP is not well understood. It probably involves interactions between biological and psychosocial factors and pruritus-specific risk factors as well as mechanisms shared with other persistent somatic symptoms addressed in other projects of the SOMACROSS Research Unit (RU). Here we aim to identify psychosocial and biological factors and their interactions which might be associated with the persistence of CP with and without immunologic/inflammatory origin, that is, atopic dermatitis and pruritus on non-inflamed skin. We expect that psychosocial factors relevant to the persistence of symptoms such as fatigue and pain may also show associations to CP. METHODS AND ANALYSIS In this prospective, exploratory observational study situated in Germany, three cohorts of 40 patients each with acute exacerbation of atopic dermatitis and chronic atopic dermatitis and 40 CP patients with unaffected skin will be recruited for a comprehensive translational investigation including pruritus-specific and the shared psychosocial assessments of the RU SOMACROSS. Pruritus-specific measures will include questionnaires, quantitative sensory testing, cutaneous nerve fibre morphology, skin barrier morphology, epidermal metabolism and pruritogen blood levels. Within 1 year, patients and 80 age-matched and sex-matched healthy controls will be examined at three time points, allowing cross-sectional comparison and a longitudinal investigation of predictive outcome factors in patients under treatment according to existing guidelines. ETHICS AND DISSEMINATION The study has been approved by the ethics committees of Hamburg (2020-10200-BO-ff) and Münster (2020-676 f-S), Germany. All participants are required to provide written informed consent. Findings will be disseminated through peer-reviewed publications, scientific conferences and involvement of relevant stakeholders, patients and the lay public. TRIAL REGISTRATION NUMBER DRKS00026646.
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Affiliation(s)
- Gudrun Schneider
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Sonja Ständer
- Competence Center Chronic Pruritus, Department of Dermatology, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Stefan Kahnert
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Manuel Pedro Pereira
- Competence Center Chronic Pruritus, Department of Dermatology, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Christian Mess
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Hamburg, Germany
| | - Volker Huck
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Hamburg, Germany
| | - Konstantin Agelopoulos
- Competence Center Chronic Pruritus, Department of Dermatology, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Gina Frank
- Department of Psychosomatic Medicine and Psychotherapy, University Hospital Munster, Munster, Nordrhein-Westfalen, Germany
| | - Stefan W Schneider
- Department of Dermatology and Venereology, University Medical Center Hamburg-Eppendorf, Hamburg, Hamburg, Germany
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Huck V, Chen PC, Xu ER, Tischer A, Klemm U, Aponte-Santamaría C, Mess C, Obser T, Kutzki F, König G, Denis CV, Gräter F, Wilmanns M, Auton M, Schneider SW, Schneppenheim R, Hennig J, Brehm MA. Gain-of-Function Variant p.Pro2555Arg of von Willebrand Factor Increases Aggregate Size through Altering Stem Dynamics. Thromb Haemost 2020; 122:226-239. [PMID: 33385180 PMCID: PMC8828397 DOI: 10.1055/a-1344-4405] [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] [Indexed: 11/02/2022]
Abstract
The multimeric plasma glycoprotein (GP) von Willebrand factor (VWF) is best known for recruiting platelets to sites of injury during primary hemostasis. Generally, mutations in the VWF gene lead to loss of hemostatic activity and thus the bleeding disorder von Willebrand disease. By employing cone and platelet aggregometry and microfluidic assays, we uncovered a platelet GPIIb/IIIa-dependent prothrombotic gain of function (GOF) for variant p.Pro2555Arg, located in the C4 domain, leading to an increase in platelet aggregate size. We performed complementary biophysical and structural investigations using circular dichroism spectra, small-angle X-ray scattering, nuclear magnetic resonance spectroscopy, molecular dynamics simulations on the single C4 domain, and dimeric wild-type and p.Pro2555Arg constructs. C4-p.Pro2555Arg retained the overall structural conformation with minor populations of alternative conformations exhibiting increased hinge flexibility and slow conformational exchange. The dimeric protein becomes disordered and more flexible. Our data suggest that the GOF does not affect the binding affinity of the C4 domain for GPIIb/IIIa. Instead, the increased VWF dimer flexibility enhances temporal accessibility of platelet-binding sites. Using an interdisciplinary approach, we revealed that p.Pro2555Arg is the first VWF variant, which increases platelet aggregate size and shows a shear-dependent function of the VWF stem region, which can become hyperactive through mutations. Prothrombotic GOF variants of VWF are a novel concept of a VWF-associated pathomechanism of thromboembolic events, which is of general interest to vascular health but not yet considered in diagnostics. Thus, awareness should be raised for the risk they pose. Furthermore, our data implicate the C4 domain as a novel antithrombotic drug target.
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Affiliation(s)
- Volker Huck
- Department of Dermatology and Venereology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Po-Chia Chen
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Emma-Ruoqi Xu
- European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany
| | - Alexander Tischer
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, United States
| | - Ulrike Klemm
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Camilo Aponte-Santamaría
- Max Planck Tandem Group in Computational Biophysics, University of los Andes, Bogotá, Colombia.,Interdisciplinary Center for Scientific Computing, Heidelberg University, Heidelberg, Germany
| | - Christian Mess
- Department of Dermatology and Venereology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Obser
- Department of Dermatology and Venereology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Fabian Kutzki
- Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany.,Institute of Physical Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
| | - Gesa König
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Cécile V Denis
- Laboratory of Hemostasis, Inflammation and Thrombosis, Institut National de la Santé et de la Recherche Médicale UMR_1176, Université Paris-Saclay, Le Kremlin-Bicêtre, France
| | - Frauke Gräter
- Interdisciplinary Center for Scientific Computing, Heidelberg University, Heidelberg, Germany.,Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany
| | - Matthias Wilmanns
- European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany.,University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Matthew Auton
- Division of Hematology, Mayo Clinic, Rochester, Minnesota, United States
| | - Stefan W Schneider
- Department of Dermatology and Venereology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Reinhard Schneppenheim
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Janosch Hennig
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Maria A Brehm
- Department of Dermatology and Venereology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Sandoval-Pérez A, Berger RML, Garaizar A, Farr SE, Brehm MA, König G, Schneider SW, Collepardo-Guevara R, Huck V, Rädler JO, Aponte-Santamaría C. DNA binds to a specific site of the adhesive blood-protein von Willebrand factor guided by electrostatic interactions. Nucleic Acids Res 2020; 48:11812-11813. [PMID: 33091113 PMCID: PMC7672435 DOI: 10.1093/nar/gkaa988] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Angélica Sandoval-Pérez
- Max Planck Tandem Group in Computational Biophysics, University of Los Andes, Cra. 1, 18A-12, 111711, Bogotá, Colombia
| | - Ricarda M L Berger
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Adiran Garaizar
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK
| | - Stephen E Farr
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK
| | - Maria A Brehm
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Gesa König
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Stefan W Schneider
- Department of Dermatology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Rosana Collepardo-Guevara
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK.,Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK.,Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Volker Huck
- Department of Dermatology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Joachim O Rädler
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Camilo Aponte-Santamaría
- Max Planck Tandem Group in Computational Biophysics, University of Los Andes, Cra. 1, 18A-12, 111711, Bogotá, Colombia.,Interdisciplinary Center for Scientific Computing, Heidelberg University, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
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Sandoval-Pérez A, Berger RML, Garaizar A, Farr SE, Brehm MA, König G, Schneider SW, Collepardo-Guevara R, Huck V, Rädler JO, Aponte-Santamaría C. DNA binds to a specific site of the adhesive blood-protein von Willebrand factor guided by electrostatic interactions. Nucleic Acids Res 2020; 48:7333-7344. [PMID: 32496552 PMCID: PMC7367192 DOI: 10.1093/nar/gkaa466] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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] [Received: 12/09/2019] [Revised: 05/07/2020] [Accepted: 05/27/2020] [Indexed: 02/07/2023] Open
Abstract
Neutrophils release their intracellular content, DNA included, into the bloodstream to form neutrophil extracellular traps (NETs) that confine and kill circulating pathogens. The mechanosensitive adhesive blood protein, von Willebrand Factor (vWF), interacts with the extracellular DNA of NETs to potentially immobilize them during inflammatory and coagulatory conditions. Here, we elucidate the previously unknown molecular mechanism governing the DNA–vWF interaction by integrating atomistic, coarse-grained, and Brownian dynamics simulations, with thermophoresis, gel electrophoresis, fluorescence correlation spectroscopy (FCS), and microfluidic experiments. We demonstrate that, independently of its nucleotide sequence, double-stranded DNA binds to a specific helix of the vWF A1 domain, via three arginines. This interaction is attenuated by increasing the ionic strength. Our FCS and microfluidic measurements also highlight the key role shear-stress has in enabling this interaction. Our simulations attribute the previously-observed platelet-recruitment reduction and heparin-size modulation, upon establishment of DNA–vWF interactions, to indirect steric hindrance and partial overlap of the binding sites, respectively. Overall, we suggest electrostatics—guiding DNA to a specific protein binding site—as the main driving force defining DNA–vWF recognition. The molecular picture of a key shear-mediated DNA–protein interaction is provided here and it constitutes the basis for understanding NETs-mediated immune and hemostatic responses.
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Affiliation(s)
- Angélica Sandoval-Pérez
- Max Planck Tandem Group in Computational Biophysics, University of Los Andes, Cra. 1, 18A-12, 111711, Bogotá, Colombia
| | - Ricarda M L Berger
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Adiran Garaizar
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK
| | - Stephen E Farr
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK
| | - Maria A Brehm
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Gesa König
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Stefan W Schneider
- Department of Dermatology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Rosana Collepardo-Guevara
- Maxwell Centre, Cavendish Laboratory, Department of Physics, University of Cambridge, J J Thomson Avenue, Cambridge CB3 0HE, UK.,Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK.,Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Volker Huck
- Department of Dermatology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Martinistr. 52, 20246 Hamburg, Germany
| | - Joachim O Rädler
- Faculty of Physics and Center for NanoScience, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Camilo Aponte-Santamaría
- Max Planck Tandem Group in Computational Biophysics, University of Los Andes, Cra. 1, 18A-12, 111711, Bogotá, Colombia.,Interdisciplinary Center for Scientific Computing, Heidelberg University, Im Neuenheimer Feld 205, 69120 Heidelberg, Germany
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Schneider MF, Fallah MA, Mess C, Obser T, Schneppenheim R, Alexander-Katz A, Schneider SW, Huck V. Platelet adhesion and aggregate formation controlled by immobilised and soluble VWF. BMC Mol Cell Biol 2020; 21:64. [PMID: 32917131 PMCID: PMC7488753 DOI: 10.1186/s12860-020-00309-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 08/26/2020] [Indexed: 11/21/2022] Open
Abstract
Background It has been demonstrated that von Willebrand factor (VWF) mediated platelet-endothelium and platelet-platelet interactions are shear dependent. The VWF’s mobility under dynamic conditions (e.g. flow) is pivotal to platelet adhesion and VWF-mediated aggregate formation in the cascade of VWF-platelet interactions in haemostasis. Results Combining microfluidic tools with fluorescence and reflection interference contrast microscopy (RICM), here we show, that specific deletions in the A-domains of the biopolymer VWF affect both, adhesion and aggregation properties independently. Intuitively, the deletion of the A1-domain led to a significant decrease in both adhesion and aggregate formation of platelets. Nevertheless, the deletion of the A2-domain revealed a completely different picture, with a significant increase in formation of rolling aggregates (gain of function). We predict that the A2-domain effectively ‘masks’ the potential between the platelet glycoprotein (GP) Ib and the VWF A1-domain. Furthermore, the deletion of the A3-domain led to no significant variation in either of the two functional characteristics. Conclusions These data demonstrate that the macroscopic functional properties i.e. adhesion and aggregate formation cannot simply be assigned to the properties of one particular domain, but have to be explained by cooperative phenomena. The absence or presence of molecular entities likewise affects the properties (thermodynamic phenomenology) of its neighbours, therefore altering the macromolecular function.
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Affiliation(s)
- Matthias F Schneider
- Department of Physics, Medical and Biological Physics, Technical University Dortmund, Emil-Figge-Str. 50, 44227, Dortmund, Germany
| | - Mohammad A Fallah
- Department of Chemistry, University of Konstanz, Universitätsstr. 10, 78457, Constance, Germany
| | - Christian Mess
- University Medical Centre Hamburg-Eppendorf, Centre for Internal Medicine, Martinistr. 52, 20246, Hamburg, Germany
| | - Tobias Obser
- Department of Paediatric Haematology and Oncology, University Medical Centre Hamburg-Eppendorf, Martinistr. 52, 20246, Hamburg, Germany
| | - Reinhard Schneppenheim
- Department of Paediatric Haematology and Oncology, University Medical Centre Hamburg-Eppendorf, Martinistr. 52, 20246, Hamburg, Germany
| | - Alfredo Alexander-Katz
- Department of Materials Science and Engineerin, Massachusetts Institute of Technology, 400 Technology Sq. (NE46-605), Cambridge, MA, 02139, USA
| | - Stefan W Schneider
- University Medical Centre Hamburg-Eppendorf, Centre for Internal Medicine, Martinistr. 52, 20246, Hamburg, Germany
| | - Volker Huck
- University Medical Centre Hamburg-Eppendorf, Centre for Internal Medicine, Martinistr. 52, 20246, Hamburg, Germany. .,Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany.
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Gorzelanny C, Mess C, Schneider SW, Huck V, Brandner JM. Skin Barriers in Dermal Drug Delivery: Which Barriers Have to Be Overcome and How Can We Measure Them? Pharmaceutics 2020; 12:E684. [PMID: 32698388 PMCID: PMC7407329 DOI: 10.3390/pharmaceutics12070684] [Citation(s) in RCA: 73] [Impact Index Per Article: 18.3] [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: 06/05/2020] [Revised: 07/11/2020] [Accepted: 07/14/2020] [Indexed: 12/13/2022] Open
Abstract
Although, drugs are required in the various skin compartments such as viable epidermis, dermis, or hair follicles, to efficiently treat skin diseases, drug delivery into and across the skin is still challenging. An improved understanding of skin barrier physiology is mandatory to optimize drug penetration and permeation. The various barriers of the skin have to be known in detail, which means methods are needed to measure their functionality and outside-in or inside-out passage of molecules through the various barriers. In this review, we summarize our current knowledge about mechanical barriers, i.e., stratum corneum and tight junctions, in interfollicular epidermis, hair follicles and glands. Furthermore, we discuss the barrier properties of the basement membrane and dermal blood vessels. Barrier alterations found in skin of patients with atopic dermatitis are described. Finally, we critically compare the up-to-date applicability of several physical, biochemical and microscopic methods such as transepidermal water loss, impedance spectroscopy, Raman spectroscopy, immunohistochemical stainings, optical coherence microscopy and multiphoton microscopy to distinctly address the different barriers and to measure permeation through these barriers in vitro and in vivo.
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Affiliation(s)
| | | | | | | | - Johanna M. Brandner
- Department of Dermatology and Venerology, Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany; (C.G.); (C.M.); (S.W.S.); (V.H.)
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Gallé T, Bayerle M, Pittois D, Huck V. Allocating biocide sources and flow paths to surface waters using passive samplers and flood wave chemographs. Water Res 2020; 173:115533. [PMID: 32032885 DOI: 10.1016/j.watres.2020.115533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/11/2019] [Accepted: 01/20/2020] [Indexed: 06/10/2023]
Abstract
Biocide emissions have been shown to pose a comparable risk to aquatic life as pesticides in urbanized catchments. Sources of biocides have been reported to be steady flows from wastewater treatment plants as well as direct building wash off during rain events. A simple methodology to separate wastewater from surface runoff contribution during flood waves had been missing until now. This study introduces an elegant passive sampler method used to derive source allocation during flood waves based on the recalcitrant wastewater tracer carbamazepine. Field calibration of sampling rates during low- and high-flow with continuous autosampler monitoring indicated that uptake rates of polar compounds in caged POCIS are very close in both hydrological situations, allowing for a direct comparison. The passive sampler regressions showed that on a regional level carbendazim originated essentially from wastewater flows, while surface runoff contributed 31% and 74% respectively to terbutryn and diuron mass flows during flood-waves. A local autosampler campaign on a 38 km2 catchment using the same wastewater marker approach found increasing surface runoff allocations with event flow in the order terbutryn < carbendazim < diuron in accordance with results from a nearby combined sewer overflow. Both source allocation methods can be used to establish pertinent regional and local biocide mitigation plans. The passive sampler approach is by far the more cost efficient method.
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Affiliation(s)
- T Gallé
- Luxembourg Institute of Science and Technology, ERIN Dept, Luxembourg.
| | - M Bayerle
- Luxembourg Institute of Science and Technology, ERIN Dept, Luxembourg
| | - D Pittois
- Luxembourg Institute of Science and Technology, ERIN Dept, Luxembourg
| | - V Huck
- Luxembourg Institute of Science and Technology, ERIN Dept, Luxembourg
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11
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Nicolay JP, Thorn V, Daniel C, Amann K, Siraskar B, Lang F, Hillgruber C, Goerge T, Hoffmann S, Gorzelanny C, Huck V, Mess C, Obser T, Schneppenheim R, Fleming I, Schneider MF, Schneider SW. Cellular stress induces erythrocyte assembly on intravascular von Willebrand factor strings and promotes microangiopathy. Sci Rep 2018; 8:10945. [PMID: 30026593 PMCID: PMC6053440 DOI: 10.1038/s41598-018-28961-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Accepted: 07/01/2018] [Indexed: 11/17/2022] Open
Abstract
Microangiopathy with subsequent organ damage represents a major complication in several diseases. The mechanisms leading to microvascular occlusion include von Willebrand factor (VWF), notably the formation of ultra-large von Willebrand factor fibers (ULVWFs) and platelet aggregation. To date, the contribution of erythrocytes to vascular occlusion is incompletely clarified. We investigated the platelet-independent interaction between stressed erythrocytes and ULVWFs and its consequences for microcirculation and organ function under dynamic conditions. In response to shear stress, erythrocytes interacted strongly with VWF to initiate the formation of ULVWF/erythrocyte aggregates via the binding of Annexin V to the VWF A1 domain. VWF-erythrocyte adhesion was attenuated by heparin and the VWF-specific protease ADAMTS13. In an in vivo model of renal ischemia/reperfusion injury, erythrocytes adhered to capillaries of wild-type but not VWF-deficient mice and later resulted in less renal damage. In vivo imaging in mice confirmed the adhesion of stressed erythrocytes to the vessel wall. Moreover, enhanced eryptosis rates and increased VWF binding were detected in blood samples from patients with chronic renal failure. Our study demonstrates that stressed erythrocytes have a pronounced binding affinity to ULVWFs. The discovered mechanisms suggest that erythrocytes are essential for the pathogenesis of microangiopathies and renal damage by actively binding to ULVWFs.
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Affiliation(s)
- Jan P Nicolay
- Department of Dermatology, Venereology and Allergy, University Medical Center Mannheim, Ruprecht-Karls-University of Heidelberg, Mannheim, Germany. .,Division of Immunogenetics, German Cancer Research Center (DKFZ), Heidelberg, Germany.
| | - Verena Thorn
- Department of Dermatology, Venereology and Allergy, University Medical Center Mannheim, Ruprecht-Karls-University of Heidelberg, Mannheim, Germany
| | - Christoph Daniel
- Department of Nephropathology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Kerstin Amann
- Department of Nephropathology, Friedrich-Alexander-University (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | | | - Florian Lang
- Department of Physiology, University of Tübingen, Tübingen, Germany
| | - Carina Hillgruber
- Department of Dermatology, University Hospital Münster, Münster, Germany
| | - Tobias Goerge
- Department of Dermatology, University Hospital Münster, Münster, Germany
| | - Stefan Hoffmann
- Institute of Plant Biology and Biotechnology (IBBP), Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Christian Gorzelanny
- Department of Dermatology, Venereology and Allergy, University Medical Center Mannheim, Ruprecht-Karls-University of Heidelberg, Mannheim, Germany.,Department of Dermatology and Venerology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Volker Huck
- Department of Dermatology, Venereology and Allergy, University Medical Center Mannheim, Ruprecht-Karls-University of Heidelberg, Mannheim, Germany.,Department of Dermatology and Venerology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Christian Mess
- Department of Dermatology and Venerology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Obser
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Reinhard Schneppenheim
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Ingrid Fleming
- Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, Frankfurt am Main, Germany
| | | | - Stefan W Schneider
- Department of Dermatology and Venerology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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12
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Netsch P, Elvers-Hornung S, Uhlig S, Klüter H, Huck V, Kirschhöfer F, Brenner-Weiß G, Janetzko K, Solz H, Wuchter P, Bugert P, Bieback K. Human mesenchymal stromal cells inhibit platelet activation and aggregation involving CD73-converted adenosine. Stem Cell Res Ther 2018; 9:184. [PMID: 29973267 PMCID: PMC6033237 DOI: 10.1186/s13287-018-0936-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 03/09/2018] [Revised: 06/08/2018] [Accepted: 06/19/2018] [Indexed: 02/06/2023] Open
Abstract
Background Mesenchymal stromal cells (MSCs) are promising cell therapy candidates. Clinical application is considered safe. However, minor side effects have included thromboembolism and instant blood-mediated inflammatory reactions suggesting an effect of MSC infusion on hemostasis. Previous studies focusing on plasmatic coagulation as a secondary hemostasis step detected both procoagulatory and anticoagulatory activities of MSCs. We now focus on primary hemostasis and analyzed whether MSCs can promote or inhibit platelet activation. Methods Effects of MSCs and MSC supernatant on platelet activation and function were studied using flow cytometry and further platelet function analyses. MSCs from bone marrow (BM), lipoaspirate (LA) and cord blood (CB) were compared to human umbilical vein endothelial cells or HeLa tumor cells as inhibitory or activating cells, respectively. Results BM-MSCs and LA-MSCs inhibited activation and aggregation of stimulated platelets independent of the agonist used. This inhibitory effect was confirmed in diagnostic point-of-care platelet function analyses in platelet-rich plasma and whole blood. Using inhibitors of the CD39–CD73–adenosine axis, we showed that adenosine produced by CD73 ectonucleotidase activity was largely responsible for the LA-MSC and BM-MSC platelet inhibitory action. With CB-MSCs, batch-dependent responses were obvious, with some batches exerting inhibition and others lacking this effect. Conclusions Studies focusing on plasmatic coagulation suggested both procoagulatory and anticoagulatory activities of MSCs. We now show that MSCs can, dependent on their tissue origin, inhibit platelet activation involving adenosine converted from adenosine monophosphate by CD73 ectonucleotidase activity. These data may have strong implications for safety and risk/benefit assessment regarding MSCs from different tissue sources and may help to explain the tissue protective mode of action of MSCs. The adenosinergic pathway emerges as a key mechanism by which MSCs exert hemostatic and immunomodulatory functions. Electronic supplementary material The online version of this article (10.1186/s13287-018-0936-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- P Netsch
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany
| | - S Elvers-Hornung
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany
| | - S Uhlig
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany.,Flow Core Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - H Klüter
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany
| | - V Huck
- Center for Internal Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - F Kirschhöfer
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - G Brenner-Weiß
- Institute of Functional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - K Janetzko
- Institute for Clinical Chemistry, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - H Solz
- Mannheim Clinic for Plastic Surgery, Mannheim, Germany
| | - P Wuchter
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany
| | - P Bugert
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany
| | - K Bieback
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, German Red Cross Blood Donor Service Baden-Württemberg-Hessen, Friedrich-Ebert Straße 107, 68167, Mannheim, Germany.
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13
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Springer S, Zieger M, Hipler UC, Lademann J, Albrecht V, Bueckle R, Meß C, Kaatz M, Huck V. Multiphotonic staging of chronic wounds and evaluation of sterile, optical transparent bacterial nanocellulose covering: A diagnostic window into human skin. Skin Res Technol 2018; 25:68-78. [DOI: 10.1111/srt.12597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2018] [Indexed: 12/12/2022]
Affiliation(s)
- S. Springer
- Department of Dermatology and Allergology; University Hospital; Jena Germany
- Department of Dermatology and Allergology; SRH Wald-Klinikum Gera GmbH; Gera Germany
| | - M. Zieger
- Department of Dermatology and Allergology; University Hospital; Jena Germany
- Department of Dermatology and Allergology; SRH Wald-Klinikum Gera GmbH; Gera Germany
| | - U. C. Hipler
- Department of Dermatology and Allergology; University Hospital; Jena Germany
| | - J. Lademann
- Center of Experimental and Cutaneous Physiology (CCP); Department of Dermatology, Venereology and Allergology; Charité-Universitätsmedizin Berlin; Berlin Germany
| | | | | | - C. Meß
- Department of Dermatology; University Hospital; Muenster Germany
| | - M. Kaatz
- Department of Dermatology and Allergology; University Hospital; Jena Germany
- Department of Dermatology and Allergology; SRH Wald-Klinikum Gera GmbH; Gera Germany
| | - V. Huck
- Center for Internal Medicine; University Medical Center Hamburg-Eppendorf; Hamburg Germany
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14
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Aponte-Santamaría C, Obser T, Grässle S, Oyen F, Budde U, Schneppenheim S, Baldauf C, Gräter F, Schneider SW, Schneppenheim R, Brehm MA, Huck V. von Willebrand disease type 2A phenotypes IIC, IID and IIE: A day in the life of shear-stressed mutant von Willebrand factor. Thromb Haemost 2017; 112:96-108. [DOI: 10.1160/th13-11-0902] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 02/11/2014] [Indexed: 11/05/2022]
Abstract
SummaryThe bleeding disorder von Willebrand disease (VWD) is caused by mutations of von Willebrand factor (VWF), a multimeric glycoprotein essential for platelet-dependent primary haemostasis. VWD type 2A–associated mutations each disrupt VWF biosynthesis and function at different stages, depending on the VWF domain altered by the mutation. These effects cause considerable heterogeneity in phenotypes and symptoms. To characterise the molecular mechanisms underlying the specific VWF deficiencies in VWD 2A/IIC, IID and IIE, we investigated VWF variants with patient-derived mutations either in the VWF pro-peptide or in domains D3 or CK. Additionally to static assays and molecular dynamics (MD) simulations we used microfluidic approaches to perform a detailed investigation of the shear-dependent function of VWD 2A mutants. For each group, we found distinct characteristics in their intracellular localisation visualising specific defects in biosynthesis which are correlated to respective multimer patterns. Using microfluidic assays we further determined shear flow-dependent characteristics in polymer-platelet-aggregate formation, platelet binding and string formation for all mutants. The phenotypes observed under flow conditions were not related to the mutated VWF domain. By MD simulations we further investigated how VWD 2A/IID mutations might alter the ability of VWF to form carboxy-terminal dimers. In conclusion, our study offers a comprehensive picture of shear-dependent and shear-independent dysfunction of VWD type 2A mutants. Furthermore, our microfluidic assay might open new possibilities for diagnosis of new VWD phenotypes and treatment choice for VWD patients with shear-dependent VWF dysfunctions that are currently not detectable by static tests.
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15
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Kleinerüschkamp F, Barg A, Schnaeker EM, Huck V, Schneider M, Steinhoff M, Goerge T, Schneider S. Microfluidic reveals generation of platelet-strings on tumoractivated endothelium. Thromb Haemost 2017. [DOI: 10.1160/th07-03-0163] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
SummaryNeoplastic diseases are often associated with thromboembolic events,however the precise mechanism underlying this observation is a matter of ongoing investigation. It is known that matrixmetalloproteinase- 1 (MMP-1) canonically activates the thrombin receptor (PAR-1) and we recently reported that highly metastatic tumor cells of melanoma and colon cancer are secreting matrixmetalloproteinase-1. This tumor-derived MMP1 was shown to be a major activator of endothelial PAR-1, thus leading to endothelial cell activation. As tumor-induced thrombosis is a characteristic of metastazing tumors, we investigated whether tumor-derived supernatant (TUSN) from melanoma and colon cancer may induce adhesion of circulating platelets,an initial step in thrombus formation.A time-course study revealed that TU-SN induces a rapid secretion of von Willebrand factor (VWF) within minutes. Using a novel microfluidic device we analyzed platelet-endothelial interactions in a closed circuit. Immunofluorescence imaging showed that TU-SN rapidly induces platelet- string formation via secreted VWF. We demonstrated that tumor-derived supernatant is a potent agonist inducing platelet adhesion under flow conditions.
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16
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Häuselmann I, Roblek M, Protsyuk D, Huck V, Knopfova L, Grässle S, Bauer AT, Schneider SW, Borsig L. Monocyte Induction of E-Selectin-Mediated Endothelial Activation Releases VE-Cadherin Junctions to Promote Tumor Cell Extravasation in the Metastasis Cascade. Cancer Res 2016; 76:5302-12. [PMID: 27488527 DOI: 10.1158/0008-5472.can-16-0784] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Accepted: 06/27/2016] [Indexed: 12/24/2022]
Abstract
Tumor cells interact with blood constituents and these interactions promote metastasis. Selectins are vascular receptors facilitating interactions of tumor cells with platelets, leukocytes, and endothelium, but the role of endothelial E-selectin remains unclear. Here we show that E-selectin is a major receptor for monocyte recruitment to tumor cell-activated endothelium. Experimental and spontaneous lung metastasis using murine tumor cells, without E-selectin ligands, were attenuated in E-selectin-deficient mice. Tumor cell-derived CCL2 promoted endothelial activation, resulting in enhanced endothelial E-selectin expression. The recruitment of inflammatory monocytes to metastasizing tumor cells was dependent on the local endothelial activation and the presence of E-selectin. Monocytes promoted transendothelial migration of tumor cells through the induction of E-selectin-dependent endothelial retractions and a subsequent modulation of tight junctions through dephosphorylation of VE-cadherin. Thus, endothelial E-selectin shapes the tumor microenvironment through the recruitment, adhesion, and activation of monocytes that facilitate tumor cell extravasation and thereby metastasis. These findings provide evidence that endothelial E-selectin is a novel factor contributing to endothelial retraction required for efficient lung metastasis. Cancer Res; 76(18); 5302-12. ©2016 AACR.
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Affiliation(s)
- Irina Häuselmann
- Institute of Physiology, University of Zürich and Zürich Center for Integrative Human Physiology, Zurich, Switzerland
| | - Marko Roblek
- Institute of Physiology, University of Zürich and Zürich Center for Integrative Human Physiology, Zurich, Switzerland
| | - Darya Protsyuk
- Institute of Physiology, University of Zürich and Zürich Center for Integrative Human Physiology, Zurich, Switzerland
| | - Volker Huck
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Lucia Knopfova
- International Clinical Research Center, Center for Biological and Cellular Engineering, St. Anne's University Hospital and Institute of Experimental Biology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Sandra Grässle
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Alexander T Bauer
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Stefan W Schneider
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Lubor Borsig
- Institute of Physiology, University of Zürich and Zürich Center for Integrative Human Physiology, Zurich, Switzerland.
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17
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Strozyk EA, Desch A, Poeppelmann B, Magnolo N, Wegener J, Huck V, Schneider SW. Melanoma-derived IL-1 converts vascular endothelium to a proinflammatory and procoagulatory phenotype via NFκB activation. Exp Dermatol 2016; 23:670-6. [PMID: 25041487 DOI: 10.1111/exd.12505] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2014] [Indexed: 01/29/2023]
Abstract
Spreading of melanoma is associated with efficient extravasation of circulating tumor cells from the vascular system into distant target organs. This process is accompanied and supported by proinflammatory and procoagulatory conditions. In this study, we analysed the ability of human melanoma cell lines to activate endothelial cells (ECs) in vitro. Some melanoma cells, that is, MV3, were shown to trigger an prompt calcium-flux-dependent, procoagulatory endothelial response that was accompanied by luminal release of ultra-large von Willebrand factor (ULVWF) fibres that were immobilized to the endothelial surface layer. In contrast to MV3-derived supernatant, prolonged treatment of ECs with WM9-derived supernatant mediated a pronounced activation of nuclear factor kappa B (NFκB). NFκB activation in ECs was dependent on both IL-1α and IL-1β secreted from melanoma cells. Melanoma-derived IL-1 mediated an upregulation of proinflammatory cytokines IL-6 and IL-8, the intercellular adhesion molecule-1 (ICAM-1), the vascular cell adhesion molecule-1 (VCAM-1) and the procoagulatory tissue factor (TF) in ECs. Our data show that melanoma cells activate ECs either directly and within seconds or by an IL-1-mediated NFκB activation. Both pathways of EC activation convert the regular repressive function of ECs on inflammation and coagulation to a proinflammatory and procoagulatory surface that supports tumor progression.
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Affiliation(s)
- Elwira A Strozyk
- Experimental Dermatology, Department of Dermatology, TU Dresden, Dresden, Germany
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18
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Huck V, Gorzelanny C, Thomas K, Getova V, Niemeyer V, Zens K, Unnerstall TR, Feger JS, Fallah MA, Metze D, Ständer S, Luger TA, Koenig K, Mess C, Schneider SW. From morphology to biochemical state - intravital multiphoton fluorescence lifetime imaging of inflamed human skin. Sci Rep 2016; 6:22789. [PMID: 27004454 PMCID: PMC4804294 DOI: 10.1038/srep22789] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [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: 08/20/2015] [Accepted: 02/18/2016] [Indexed: 01/24/2023] Open
Abstract
The application of multiphoton microscopy in the field of biomedical research and advanced diagnostics promises unique insights into the pathophysiology of inflammatory skin diseases. In the present study, we combined multiphoton-based intravital tomography (MPT) and fluorescence lifetime imaging (MPT-FLIM) within the scope of a clinical trial of atopic dermatitis with the aim of providing personalised data on the aetiopathology of inflammation in a non-invasive manner at patients' bedsides. These 'optical biopsies' generated via MPT were morphologically analysed and aligned with classical skin histology. Because of its subcellular resolution, MPT provided evidence of a redistribution of mitochondria in keratinocytes, indicating an altered cellular metabolism. Two independent morphometric algorithms reliably showed an even distribution in healthy skin and a perinuclear accumulation in inflamed skin. Moreover, using MPT-FLIM, detection of the onset and progression of inflammatory processes could be achieved. In conclusion, the change in the distribution of mitochondria upon inflammation and the verification of an altered cellular metabolism facilitate a better understanding of inflammatory skin diseases and may permit early diagnosis and therapy.
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Affiliation(s)
- Volker Huck
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Christian Gorzelanny
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Kai Thomas
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Valentina Getova
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Verena Niemeyer
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Katharina Zens
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Tim R. Unnerstall
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Julia S. Feger
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
| | - Mohammad A. Fallah
- University of Konstanz, Department of Biophysical Chemistry, Universitätsstr. 10, 78457 Konstanz, Germany
| | - Dieter Metze
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Sonja Ständer
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Thomas A. Luger
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Karsten Koenig
- Saarland University, Mechatronics & Physics, Campus A5 1, 66123 Saarbrücken, Germany
- JenLab GmbH, Schillerstr. 1, 07745 Jena, Germany
| | - Christian Mess
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
- University of Münster, Department of Dermatology, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Stefan W. Schneider
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany
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Rajabi T, Ahrens R, Huck V, März M, Gantenbein H, Schneider SW, Schroten H, Guber AE. Investigation of endothelial growth using a sensors-integrated microfluidic system to simulate physiological barriers. Current Directions in Biomedical Engineering 2015. [DOI: 10.1515/cdbme-2015-0004] [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: 11/15/2022] Open
Abstract
Abstract
In this paper we present a microfluidic system based on transparent biocompatible polymers with a porous membrane as substrate for various cell types which allows the simulation of various physiological barriers under continuous laminar flow conditions at distinct tunable shear rates. Besides live cell and fluorescence microscopy, integrated electrodes enable the investigation of the permeability and barrier function of the cell layer as well as their interaction with external manipulations using the Electric Cell-substrate Impedance Sensing (ECIS) method.
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Affiliation(s)
- Taleieh Rajabi
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Ralf Ahrens
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Germany
| | - Volker Huck
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Martin März
- Department of Pediatric and Adolescent Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Hanna Gantenbein
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Germany
| | - Stefan W. Schneider
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Horst Schroten
- Department of Pediatric and Adolescent Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Andreas E. Guber
- Institute of Microstructure Technology, Karlsruhe Institute of Technology, Germany
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20
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Aponte-Santamaría C, Huck V, Posch S, Bronowska AK, Grässle S, Brehm MA, Obser T, Schneppenheim R, Hinterdorfer P, Schneider SW, Baldauf C, Gräter F. Force-sensitive autoinhibition of the von Willebrand factor is mediated by interdomain interactions. Biophys J 2015; 108:2312-21. [PMID: 25954888 PMCID: PMC4423058 DOI: 10.1016/j.bpj.2015.03.041] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 03/16/2015] [Accepted: 03/18/2015] [Indexed: 01/07/2023] Open
Abstract
Von Willebrand factor (VWF) plays a central role in hemostasis. Triggered by shear-stress, it adheres to platelets at sites of vascular injury. Inactivation of VWF has been associated to the shielding of its adhesion sites and proteolytic cleavage. However, the molecular nature of this shielding and its coupling to cleavage under shear-forces in flowing blood remain unknown. In this study, we describe, to our knowledge, a new force-sensory mechanism for VWF-platelet binding, which addresses these questions, based on a combination of molecular dynamics (MD) simulations, atomic force microscopy (AFM), and microfluidic experiments. Our MD simulations demonstrate that the VWF A2 domain targets a specific region at the VWF A1 domain, corresponding to the binding site of the platelet glycoprotein Ibα (GPIbα) receptor, thereby causing its blockage. This implies autoinhibition of the VWF for the binding of platelets mediated by the A1-A2 protein-protein interaction. During force-probe MD simulations, a stretching force dissociated the A1A2 complex, thereby unblocking the GPIbα binding site. Dissociation was found to be coupled to the unfolding of the A2 domain, with dissociation predominantly occurring before exposure of the cleavage site in A2, an observation that is supported by our AFM experiments. This suggests that the A2 domain prevents platelet binding in a force-dependent manner, ensuring that VWF initiates hemostasis before inactivation by proteolytic cleavage. Microfluidic experiments with an A2-deletion VWF mutant resulted in increased platelet binding, corroborating the key autoinhibitory role of the A2 domain within VWF multimers. Overall, autoinhibition of VWF mediated by force-dependent interdomain interactions offers the molecular basis for the shear-sensitive growth of VWF-platelet aggregates, and might be similarly involved in shear-induced VWF self-aggregation and other force-sensing functions in hemostasis.
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Affiliation(s)
| | - Volker Huck
- Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Sandra Posch
- Department of Applied Experimental Biophysics, Institute of Biophysics, Johannes Kepler University, Linz, Austria
| | - Agnieszka K Bronowska
- Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany
| | - Sandra Grässle
- Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Maria A Brehm
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Obser
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Reinhard Schneppenheim
- Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Peter Hinterdorfer
- Department of Applied Experimental Biophysics, Institute of Biophysics, Johannes Kepler University, Linz, Austria
| | - Stefan W Schneider
- Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Carsten Baldauf
- Theory Department, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany.
| | - Frauke Gräter
- Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany.
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Möller K, Adolph O, Grünow J, Elrod J, Popa M, Ghosh S, Schwarz M, Schwale C, Grässle S, Huck V, Bruehl C, Wieland T, Schneider SW, Nobiling R, Wagner AH, Hecker M. Mechanism and functional impact of CD40 ligand-induced von Willebrand factor release from endothelial cells. Thromb Haemost 2015; 113:1095-108. [PMID: 25608503 DOI: 10.1160/th14-04-0336] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [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: 04/11/2014] [Accepted: 11/28/2014] [Indexed: 12/29/2022]
Abstract
Co-stimulation via CD154 binding to CD40, pivotal for both innate and adaptive immunity, may also link haemostasis to vascular remodelling. Here we demonstrate that human platelet-bound or recombinant soluble CD154 (sCD154) elicit the release from and tethering of ultra-large (UL) von Willebrand factor (vWF) multimers to the surface of human cultured endothelial cells (ECs) exposed to shear stress. This CD40-mediated ULVWF multimer release from the Weibel-Palade bodies was triggered by consecutive activation of TRAF6, the tyrosine kinase c-Src and phospholipase Cγ1 followed by inositol-1,4,5 trisphosphate-mediated calcium mobilisation. Subsequent exposure to human washed platelets caused ULVWF multimer-platelet string formation on the EC surface in a shear stress-dependent manner. Platelets tethered to these ULVWF multimers exhibited P-selectin on their surface and captured labelled monocytes from the superfusate. When exposed to shear stress and sCD154, native ECs from wild-type but not CD40 or vWF-deficient mice revealed a comparable release of ULVWF multimers to which murine washed platelets rapidly adhered, turning P-selectin-positive and subsequently capturing monocytes from the perfusate. This novel CD154-provoked ULVWF multimer-platelet string formation at normal to fast flow may contribute to vascular remodelling processes requiring the perivascular or intravascular accumulation of pro-inflammatory macrophages such as arteriogenesis or atherosclerosis.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Markus Hecker
- Markus Hecker, PhD DSc, Institute of Physiology and Pathophysiology, Division of Cardiovascular Physiology, Heidelberg University, Im Neuenheimer Feld 326, 69120 Heidelberg, Germany, Tel.: +49 6221 54 4035, Fax +49 6221 54 4038, E-mail:
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22
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Aponte Santamaría CA, Huck V, Posch S, Bronowska AK, Grässle S, Brehm MA, Obser T, Schneppenheim R, Hinterdorfer P, Schneider SW, Baldauf C, Gräter F. Mechanosensitive Von Willebrand Factor Protein-Protein Interactions Regulate Hemostasis. Biophys J 2015. [DOI: 10.1016/j.bpj.2014.11.2764] [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: 11/26/2022] Open
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23
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Grässle S, Huck V, Pappelbaum KI, Gorzelanny C, Aponte-Santamaría C, Baldauf C, Gräter F, Schneppenheim R, Obser T, Schneider SW. von Willebrand factor directly interacts with DNA from neutrophil extracellular traps. Arterioscler Thromb Vasc Biol 2014; 34:1382-9. [PMID: 24790143 DOI: 10.1161/atvbaha.113.303016] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Inflammatory conditions provoke essential processes in the human vascular system. It leads to the formation of ultralarge von Willebrand factor (VWF) fibers, which are immobilized on the endothelial cell surface and transform to highly adhesive strings under shear conditions. Furthermore, leukocytes release a meshwork of DNA (neutrophil extracellular traps) during the process of the recently discovered cell death program NETosis. In the present study, we characterized the interaction between VWF and DNA and possible binding sites to underline the role of VWF in thrombosis and inflammation besides its function in platelet adhesion. APPROACH AND RESULTS Both functionalized surfaces and intact cell layers of human umbilical vein endothelial cells were perfused with isolated, protein-free DNA or leukocytes from whole blood at distinct shear rates. DNA-VWF interaction was monitored using fluorescence microscopy, ELISA-based assays, molecular dynamics simulations, and electrostatic potential calculations. Isolated DNA, as well as DNA released by stimulated leukocytes, was able to bind to shear-activated, but not inactivated, VWF. However, DNA-VWF binding does not alter VWF degradation by a disintegrin and metalloproteinase with a thrombospondin type 1 motif, member 13. Moreover, DNA-VWF interaction can be blocked using unfractionated and low-molecular-weight heparin, and DNA-VWF complexes attenuate platelet binding to VWF. These findings were supported using molecular dynamics simulations and electrostatic calculations of the A1- and A2-domains. CONCLUSIONS Our findings suggest that VWF directly binds and immobilizes extracellular DNA released from leukocytes. Therefore, we hypothesize that VWF might act as a linker for leukocyte adhesion to endothelial cells, supporting leukocyte extravasation and inflammation.
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Affiliation(s)
- Sandra Grässle
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Volker Huck
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Karin I Pappelbaum
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Christian Gorzelanny
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Camilo Aponte-Santamaría
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Carsten Baldauf
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Frauke Gräter
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Reinhard Schneppenheim
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Tobias Obser
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.)
| | - Stefan W Schneider
- From the Experimental Dermatology Division, Department of Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany (S.G., V.H., K.I.P., C.G., S.W.S.); Molecular Biomechanics Group, Heidelberg Institute for Theoretical Studies, Heidelberg, Germany (C.A.-S., F.G.); Theory Department, Fritz Haber Institute of the Max Planck Society, Berlin, Germany (C.B.); and Department of Pediatric Hematology and Oncology, University Medical Center, Hamburg-Eppendorf, Hamburg, Germany (R.S., T.O.).
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Huck V, Schneider MF, Gorzelanny C, Schneider SW. The various states of von Willebrand factor and their function in physiology and pathophysiology. Thromb Haemost 2014; 111:598-609. [PMID: 24573248 DOI: 10.1160/th13-09-0800] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Accepted: 02/08/2014] [Indexed: 11/05/2022]
Abstract
The specific interactions of von Willebrand factor (VWF) with the vessel wall, platelets or other interfaces strongly depend on (a shear-induced) VWF activation. Shear flow has been shown to induce a conformational transition of VWF, but is modulated by its thermodynamic state (state-function relationship). The state in turn is determined by physical (e.g. vessel geometry), physico-chemical (e.g. pH) and molecular-biological (e.g. mutants, binding) factors. Combining established results with recent insights, we reconstruct VWF biology and its state-function relationship from endothelial cell release to final degradation in the human vasculature. After VWF secretion, endothelial-anchored and shear activated VWF multimers can rapidly interact with surrounding colloids, typically with platelets. Simultaneously, this VWF activation enables ADAMTS13 to cleave VWF multimers thereby limiting VWF binding capacity. The subsequent cell-surface dissociation leads to a VWF recoiling to a globular conformation, shielding from further degradation by ADAMTS13. High local concentrations of these soluble VWF multimers, transported to the downstream vasculature, are capable for an immediate reactivation and re-polymerisation initiating colloid-binding or VWF-colloid aggregation at the site of inflamed endothelium, vessel injuries or pathological high-shear areas. Focusing on these functional steps in the lifecycle of VWF, its qualitative and quantitative deficiencies in the different VWD types will facilitate more precise diagnostics and reliable risk stratification for prophylactic therapies. The underlying biophysical principles are of general character, which broadens prospective studies on the physiological and pathophysiological impact of VWF and VWF-associated diseases and beares hope for a more universal understanding of an entire class of phenomena.
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Affiliation(s)
| | - Matthias F Schneider
- Prof. Dr. Matthias F. Schneider, Biological Physics Group, Boston University, Department of Mechanical Engineering, 110 Cummington Street, Boston, MA 02215, USA, Tel.: +1 617 353 3951, Fax: +1 617 353 3951, E-mail:
| | | | - Stefan W Schneider
- Prof. Dr. Stefan W. Schneider, Department of Dermatology, Experimental Dermatology, Heidelberg University, Medical Faculty Mannheim, Theodor-Kutzer-Ufer 1-3, 68167 Mannheim, Germany, Tel: +49 621 383 6901, Fax:+49 621 383 6903, E-mail:
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25
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Peitsch WK, Doerflinger Y, Fischer-Colbrie R, Huck V, Bauer AT, Utikal J, Goerdt S, Schneider SW. Desmoglein 2 depletion leads to increased migration and upregulation of the chemoattractant secretoneurin in melanoma cells. PLoS One 2014; 9:e89491. [PMID: 24558503 PMCID: PMC3928442 DOI: 10.1371/journal.pone.0089491] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [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: 08/09/2013] [Accepted: 01/23/2014] [Indexed: 12/21/2022] Open
Abstract
During development and progression of malignant melanoma, an important role has been attributed to alterations of cell-cell adhesions, in particular, to a “cadherin switch” from E- to N-cadherin. We have previously shown that a subtype of melanoma cells express the desmosomal cadherin desmoglein 2 as non-junction-bound cell surface protein in addition to classical cadherins. To study the role of desmoglein 2 in melanoma cells, melanoma lines containing high endogenous amounts of desmoglein 2 were depleted of the protein by RNA interference. Transwell migration and scratch wounding assays showed markedly increased migration upon desmoglein 2 suppression whereas proliferation and viability remained unaltered. In gene expression profiles, desmoglein 2 depletion was associated with overexpression of migration-related genes. Strongest overexpression was found for secretogranin II which has not been reported in melanoma cells before. The bioactive peptide derived from secretogranin II, secretoneurin, is known to exert chemoattractive functions and was demonstrated here to stimulate melanoma cell migration. In summary, we show that desmoglein 2 expression attenuates migration of melanoma cells. The mechanism of desmoglein 2 impaired cell migration is mediated by downregulation of secretogranin II. Loss of desmoglein 2 increases expression of secretogranin II, followed by an enhanced migratory activity of melanoma cells. Our data add a new pathway of regulating melanoma cell migration related to a desmoglein 2 – secretogranin II axis.
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Affiliation(s)
- Wiebke K. Peitsch
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
- Helmholtz Group for Cell Biology, German Cancer Research Center (DKFZ), Heidelberg, Germany
- * E-mail:
| | - Yvette Doerflinger
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
- Helmholtz Group for Cell Biology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | | | - Volker Huck
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
| | - Alexander T. Bauer
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
| | - Jochen Utikal
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
- Skin Cancer Unit, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Sergij Goerdt
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
| | - Stefan W. Schneider
- Department of Dermatology, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany
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26
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Dreher L, Elvers-Hornung S, Brinkmann I, Huck V, Henschler R, Gloe T, Klüter H, Bieback K. Cultivation in Human Serum Reduces Adipose Tissue-Derived Mesenchymal Stromal Cell Adhesion to Laminin and Endothelium and Reduces Capillary Entrapment. Stem Cells Dev 2013; 22:791-803. [DOI: 10.1089/scd.2012.0051] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Lena Dreher
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Medical Faculty Mannheim, Institute of Transfusion Medicine and Immunology, Heidelberg University, Mannheim, Germany
| | - Susanne Elvers-Hornung
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Medical Faculty Mannheim, Institute of Transfusion Medicine and Immunology, Heidelberg University, Mannheim, Germany
| | - Irena Brinkmann
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Medical Faculty Mannheim, Institute of Transfusion Medicine and Immunology, Heidelberg University, Mannheim, Germany
| | - Volker Huck
- Department of Dermatology, Experimental Dermatology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Reinhard Henschler
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Institute of Transfusion Medicine and Immune Haematology, Frankfurt, Germany
| | - Torsten Gloe
- Cardiovascular Physiology, Medical Faculty Mannheim, Centre for Biomedicine and Medical Technology, Heidelberg University, Mannheim, Germany
| | - Harald Klüter
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Medical Faculty Mannheim, Institute of Transfusion Medicine and Immunology, Heidelberg University, Mannheim, Germany
| | - Karen Bieback
- German Red Cross Blood Service of Baden-Württemberg–Hessen, Medical Faculty Mannheim, Institute of Transfusion Medicine and Immunology, Heidelberg University, Mannheim, Germany
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Chen H, Fallah MA, Huck V, Angerer JI, Reininger AJ, Schneider SW, Schneider MF, Alexander-Katz A. Blood-clotting-inspired reversible polymer–colloid composite assembly in flow. Nat Commun 2013; 4:1333. [DOI: 10.1038/ncomms2326] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 11/23/2012] [Indexed: 11/09/2022] Open
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Fallah MA, Huck V, Niemeyer V, Desch A, Angerer JI, McKinnon TAJ, Wixforth A, Schneider SW, Schneider MF. Circulating but not immobilized N-deglycosylated von Willebrand factor increases platelet adhesion under flow conditions. Biomicrofluidics 2013; 7:44124. [PMID: 24404057 PMCID: PMC3772935 DOI: 10.1063/1.4819746] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2013] [Accepted: 08/13/2013] [Indexed: 05/10/2023]
Abstract
The role of von Willebrand factor (VWF) as a shear stress activated platelet adhesive has been related to a coiled-elongated shape conformation. The forces dominating this transition have been suggested to be controlled by the proteins polymeric architecture. However, the fact that 20% of VWF molecular weight originates from glycan moieties has so far been neglected in these calculations. In this study, we present a systematic experimental investigation on the role of N-glycosylation for VWF mediated platelet adhesion under flow. A microfluidic flow chamber with a stenotic compartment that allows one to mimic various physiological flow conditions was designed for the efficient analysis of the adhesion spectrum. Surprisingly, we found an increase in platelet adhesion with elevated shear rate, both qualitatively and quantitatively fully conserved when N-deglycosylated VWF (N-deg-VWF) instead of VWF was immobilized in the microfluidic channel. This has been demonstrated consistently over four orders of magnitude in shear rate. In contrast, when N-deg-VWF was added to the supernatant, an increase in adhesion rate by a factor of two was detected compared to the addition of wild-type VWF. It appears that once immobilized, the role of glycans is at least modified if not-as found here for the case of adhesion-negated. These findings strengthen the physical impact of the circulating polymer on shear dependent platelet adhesion events. At present, there is no theoretical explanation for an increase in platelet adhesion to VWF in the absence of its N-glycans. However, our data indicate that the effective solubility of the protein and hence its shape or conformation may be altered by the degree of glycosylation and is therefore a good candidate for modifying the forces required to uncoil this biopolymer.
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Affiliation(s)
- M A Fallah
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany ; Department of Biophysical Chemistry, University of Konstanz, 78457 Konstanz, Germany
| | - V Huck
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - V Niemeyer
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - A Desch
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - J I Angerer
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany
| | - T A J McKinnon
- Imperial College London, Hammersmith Hospital Campus, Department of Medicine, London W12 0NN, United Kingdom
| | - A Wixforth
- University of Augsburg, Chair of Experimental Physics I, 86159 Augsburg, Germany
| | - S W Schneider
- Heidelberg University, Medical Faculty Mannheim, Experimental Dermatology, 68167 Mannheim, Germany
| | - M F Schneider
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
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Albrecht C, Huck V, Wehling M, Wendler A. In vitro inhibition of SKOV-3 cell migration as a distinctive feature of progesterone receptor membrane component type 2 versus type 1. Steroids 2012; 77:1543-50. [PMID: 23064006 DOI: 10.1016/j.steroids.2012.09.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 08/27/2012] [Accepted: 09/18/2012] [Indexed: 12/20/2022]
Abstract
Progesterone receptor membrane component type 2 (PGRMC2) is strongly homologous to PGRMC1 which is highly expressed in ovarian cancer and other cancer cells and was claimed to play an important role in chemotherapy resistance. Whereas PGRMC1 has been extensively characterized in in vitro studies, comparably little is known about PGRMC2. To determine PGRMC2's role in ovarian cancer cell proliferation and mobility PGRMC1- and 2-depleted and -overexpressing SKOV-3 cells were generated. In electric cell-substrate impedance sensing studies, PGRMC2 negatively affects SKOV-3 migration rate if overexpressed; oppositely, depletion was associated with an increased migration rate. PGRMC1 had no effect in this assay. These effects were not associated with f-actin regulation or actin cytoskeleton reorganization. Yet, these highly homologous proteins share many properties. Both PGRMC1 and 2 are localized to the endoplasmic reticulum. As PGRMC1 was reported to interact with cytochrome P450 proteins (CYP) binding of two different CYPs to PGRMC2 was tested; a stable interaction of PGRMC2 with CYP3A4 and CYP21A2 was found in human embryonic kidney cells. For both PGRMC types, cell viability assays revealed no significant differences of SKOV-3 survival in overexpressing and depleted cells. PGRMC2 also does not seem to have any influence on the apoptotic effect of cisplatin or the antiapoptotic effect of progesterone which had been reported for PGRMC1. In contrast to PGRMC1, protein levels of PGRMC2 in SKOV-3 cells are reduced by treatment with cisplatin (30-60μM). In conclusion, we show for the first time that PGRMC2 inhibits migration of SKOV-3 ovarian cancer cells in vitro.
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Affiliation(s)
- Christian Albrecht
- University of Heidelberg, Clinical Pharmacology Mannheim, Maybachstr. 14, 68169 Mannheim, Germany
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Desch A, Strozyk EA, Bauer AT, Huck V, Niemeyer V, Wieland T, Schneider SW. Highly invasive melanoma cells activate the vascular endothelium via an MMP-2/integrin αvβ5-induced secretion of VEGF-A. Am J Pathol 2012; 181:693-705. [PMID: 22659470 DOI: 10.1016/j.ajpath.2012.04.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 03/21/2012] [Accepted: 04/05/2012] [Indexed: 01/14/2023]
Abstract
Tumor cell extravasation is a critical step in the metastatic cascade and requires interaction between the tumor cell and the endothelium. Although cancer progression depends on a complex network of mechanisms, including inflammation and coagulation, the involvement of tumor-induced endothelium activation and the subsequent release of procoagulatory factors in this process are not well understood. Using tissue sections from patients with malignant melanoma, immunofluorescence studies for the presence of von Willebrand factor (VWF) clearly demonstrated endothelium activation and the formation of ultra-large VWF fibers in these patients. In vitro analyses revealed that supernatants from highly invasive melanoma cells induced an acute endothelium activation measured by VWF, P-selectin, and angiopoietin-2 release. Proteome profiling identified vascular endothelial growth factor A (VEGF-A) as the main mediator of endothelium activation. Inhibition and knock-down of VEGF-A in melanoma cells led to a rigorous decrease in VWF exocytosis. Selective small-interfering RNA to matrix metalloproteinase-2 (MMP-2) inhibited endothelium activation, and this effect correlated with reduced VEGF-A content in the supernatants of melanoma cells. Further experiments showed that active MMP-2 regulates VEGF-A in melanoma cells on a transcriptional level via an integrin αvβ5/phosphoinositide-3-kinase-dependent pathway. In conclusion, these results indicate an important role of VEGF-A in acute endothelium activation and provide clear evidence that MMP-2 plays a pivotal role in the autocrine regulation of VEGF-A expression in melanoma cells.
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Affiliation(s)
- Anna Desch
- Division of Experimental Dermatology, Department of Dermatology, Venereology, and Allergology, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany.
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Rajabi T, Huck V, Ahrens R, Apfel MC, Kim SE, Schneider SW, Guber AE. Development of a novel two-channel microfluidic system for biomedical applications in cancer research. ACTA ACUST UNITED AC 2012. [DOI: 10.1515/bmt-2012-4029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Goerge T, Kleinerüschkamp F, Barg A, Schnaeker EM, Huck V, Schneider MF, Steinhoff M, Schneider SW. Microfluidic reveals generation of platelet-strings on tumor-activated endothelium. Thromb Haemost 2007; 98:283-6. [PMID: 17721608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Neoplastic diseases are often associated with thromboembolic events, however the precise mechanism underlying this observation is a matter of ongoing investigation. It is known that matrixmetalloproteinase-1 (MMP-1) canonically activates the thrombin receptor (PAR-1) and we recently reported that highly metastatic tumor cells of melanoma and colon cancer are secreting matrixmetalloproteinase-1. This tumor-derived MMP1 was shown to be a major activator of endothelial PAR-1, thus leading to endothelial cell activation. As tumor-induced thrombosis is a characteristic of metastazing tumors, we investigated whether tumor-derived supernatant (TUSN) from melanoma and colon cancer may induce adhesion of circulating platelets, an initial step in thrombus formation. A time-course study revealed that TU-SN induces a rapid secretion of von Willebrand factor (VWF) within minutes. Using a novel microfluidic device we analyzed platelet-endothelial interactions in a closed circuit. Immunofluorescence imaging showed that TU-SN rapidly induces platelet-string formation via secreted VWF. We demonstrated that tumor-derived supernatant is a potent agonist inducing platelet adhesion under flow conditions.
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Affiliation(s)
- Tobias Goerge
- University of Münster, Department of Dermatology, Münster, Germany.
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Huck V, Niemeyer A, Goerge T, Schnaeker EM, Ossig R, Rogge P, Schneider MF, Oberleithner H, Schneider SW. Delay of acute intracellular pH recovery after acidosis decreases endothelial cell activation. J Cell Physiol 2007; 211:399-409. [PMID: 17167769 DOI: 10.1002/jcp.20947] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Reperfusion after ischemic conditions induces massive endothelial cell (EC) activation, an initial step of reperfusion injury. Reperfusion is characterized by reoxygenation, realkalinization and a localized increase of inflammatory stimuli. In this study, we focused on the influence of extracellular realkalinization on human umbilical vein endothelial cell (HUVEC) activation. We examined intracellular pH (pH(in)) and intracellular free calcium concentration ([Ca(2+)](in)), a second messenger known to mediate von Willebrand factor (VWF) exocytosis in endothelium, upon realkalinization. Furthermore, we measured the agonist-stimulated exocytosis of VWF, Interleukin-8 and soluble P-selectin (sP-Selectin) as markers of EC activation. To verify a morphological correlate of EC activation, we finally observed platelet-endothelial adherence during realkalinization using shear flow. Realkalinization of HUVEC was simulated by switching from bicarbonate buffered Ringer solution of an acidotic pH(ex) of 6.4 to a physiologic pH(ex) of 7.4. Extracellular realkalinization was accompanied by pH(in) recovery from 6.5 to 7.2 within 10 min. Application of cariporide, an inhibitor of the Na(+)/H(+) exchanger subtype 1 (NHE), during extracellular realkalinization significantly delayed the early kinetics of intracellular realkalinization. Histamine stimulated [Ca(2+)](in) was significantly increased upon realkalinization compared to control cells. Also agonist-stimulated release of VWF, Interleukin-8 and sP-Selectin was massively enhanced during pH(in) recovery in comparison to control. Furthermore, we observed an increased platelet binding to endothelium. Interestingly, each of these realkalinization-induced effects were significantly reduced by early application of cariporide. Therefore, delay of acute NHE-dependent pH(in) recovery may represent a promising mechanism for inhibition of EC activation upon reperfusion.
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Affiliation(s)
- Volker Huck
- Institute of Physiology II-Nanolab, University of Muenster, Muenster, Germany
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Diesener H, Helm U, Herbert G, Huck V, Rangacharyulu C, Richter A, Schrieder G, Stascheck A, Stiller A, Ryckebusch J, Carter J. Excitation and decay of giant resonances in the 40Ca(e,e'x) reaction. Phys Rev Lett 1994; 72:1994-1997. [PMID: 10055761 DOI: 10.1103/physrevlett.72.1994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Huck V, Pirou MH. [Patients with multiple trauma with thoracic involvement]. Rev Infirm 1988; 38:35-8. [PMID: 3387799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Huck V, Pirou MH. [Patients with multiple trauma with abdominal involvement]. Rev Infirm 1988; 38:39-41. [PMID: 3387800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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