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Tian Q, Lipp P. Apparent calcium spark properties and fast-scanning 2D confocal imaging modalities. Cell Calcium 2020; 93:102303. [PMID: 33316584 DOI: 10.1016/j.ceca.2020.102303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 09/11/2020] [Accepted: 09/25/2020] [Indexed: 10/23/2022]
Abstract
Ca2+ sparks are instrumental to understand physiological and pathological Ca2+ signaling in the heart. High-speed two spatially dimensional (2D) confocal imaging (>120 Hz) enables acquisition of sparks with high-content information, however, owing to a wide variety of different acquisition modalities the question arises: how much they reflect the "true" Ca2+ spark properties. To address this issue, we compared a fast point and a 2D-array scanner equipped with a range of different detectors. As a quasi-standard biological sample, we employed Ca2+ sparks in permeabilized and intact mouse ventricular myocytes and utilized an unbiased, automatic Ca2+ spark analysis tool, iSpark. Data from the point scanner suffered from low pixel photon fluxes (PPF) concomitant with high Poissonian noise. Images from the 2D-array scanner displayed substantially increased PPF, lower Poissonian noise and almost 3-fold increased sign-to-noise ratios. Noteworthy, data from the 2D scanner suffered from considerable inter-pinhole crosstalk evident for the permeabilized cells. Spark properties, such as frequency, amplitude, decay time and spatial spread were distinctly different for any scanner/detector combination. Our study reveals that the apparent Ca2+ spark properties differ dependent on the particular recording modality and set-up employed, quantitatively.
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Affiliation(s)
- Qinghai Tian
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology, Research Center for Molecular Imaging and Screening, Medical Faculty, Saarland University, Kirrberger Str. 100, Homburg, Saar, 66421, Germany
| | - Peter Lipp
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology, Research Center for Molecular Imaging and Screening, Medical Faculty, Saarland University, Kirrberger Str. 100, Homburg, Saar, 66421, Germany.
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2
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Kaiser E, Tian Q, Wagner M, Barth M, Xian W, Schröder L, Ruppenthal S, Kaestner L, Boehm U, Wartenberg P, Lu H, McMillin SM, Bone DBJ, Wess J, Lipp P. DREADD technology reveals major impact of Gq signalling on cardiac electrophysiology. Cardiovasc Res 2020; 115:1052-1066. [PMID: 30321287 DOI: 10.1093/cvr/cvy251] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 06/02/2018] [Accepted: 10/11/2018] [Indexed: 02/04/2023] Open
Abstract
AIMS Signalling via Gq-coupled receptors is of profound importance in many cardiac diseases such as hypertrophy and arrhythmia. Nevertheless, owing to their widespread expression and the inability to selectively stimulate such receptors in vivo, their relevance for cardiac function is not well understood. We here use DREADD technology to understand the role of Gq-coupled signalling in vivo in cardiac function. METHODS AND RESULTS We generated a novel transgenic mouse line that expresses a Gq-coupled DREADD (Dq) in striated muscle under the control of the muscle creatine kinase promotor. In vivo injection of the DREADD agonist clozapine-N-oxide (CNO) resulted in a dose-dependent, rapid mortality of the animals. In vivo electrocardiogram data revealed severe cardiac arrhythmias including lack of P waves, atrioventricular block, and ventricular tachycardia. Following Dq activation, electrophysiological malfunction of the heart could be recapitulated in the isolated heart ex vivo. Individual ventricular and atrial myocytes displayed a positive inotropic response and arrhythmogenic events in the absence of altered action potentials. Ventricular tissue sections revealed a strong co-localization of Dq with the principal cardiac connexin CX43. Western blot analysis with phosphor-specific antibodies revealed strong phosphorylation of a PKC-dependent CX43 phosphorylation site following CNO application in vivo. CONCLUSION Activation of Gq-coupled signalling has a major impact on impulse generation, impulse propagation, and coordinated impulse delivery in the heart. Thus, Gq-coupled signalling does not only modulate the myocytes' Ca2+ handling but also directly alters the heart's electrophysiological properties such as intercellular communication. This study greatly advances our understanding of the plethora of modulatory influences of Gq signalling on the heart in vivo.
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Affiliation(s)
- Elisabeth Kaiser
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Qinghai Tian
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Michael Wagner
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Monika Barth
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Wenying Xian
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Laura Schröder
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Sandra Ruppenthal
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Lars Kaestner
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
| | - Ulrich Boehm
- Center for Molecular Signaling (PZMS), Institute for Experimental and Clinical Pharmacology and Toxicology, Medical Faculty, Saarland University, Homburg, Germany
| | - Philipp Wartenberg
- Center for Molecular Signaling (PZMS), Institute for Experimental and Clinical Pharmacology and Toxicology, Medical Faculty, Saarland University, Homburg, Germany
| | - Huiyan Lu
- Mouse Transgenic Core Facility, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Sara M McMillin
- Molecular Signaling Section, Lab. of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Derek B J Bone
- Molecular Signaling Section, Lab. of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Jürgen Wess
- Molecular Signaling Section, Lab. of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Peter Lipp
- Center for Molecular Signaling (PZMS), Institute for Molecular Cell Biology; Medical Faculty, Saarland University, Homburg, Germany
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Tian Q, Schröder L, Schwarz Y, Flockerzi A, Kaestner L, Zeug A, Bruns D, Lipp P. Large scale, unbiased analysis of elementary calcium signaling events in cardiac myocytes. J Mol Cell Cardiol 2019; 135:79-89. [DOI: 10.1016/j.yjmcc.2019.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/26/2019] [Accepted: 08/12/2019] [Indexed: 12/12/2022]
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Tschernig T, Fischer T, Grissmer A, Beckmann A, Meier C, Lipp P, Schneider M. Silica nanoparticles of microrods enter lung epithelial cells. Biomed Rep 2018; 9:156-160. [PMID: 30083317 PMCID: PMC6073099 DOI: 10.3892/br.2018.1117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 06/07/2018] [Indexed: 11/12/2022] Open
Abstract
A novel type of microparticle has recently been engineered. It consists of amorphous silica nanoparticles and has a corncob-like shape. It has already been demonstrated in vivo that alveolar macrophages in the lung are able to engulf this particulate carrier and that it also functions successfully as a gene delivery system. This subsequently raises the question as to whether epithelial cells may also be possible targets for these microrods. For this purpose, the alveolar epithelial cell line A549 was used presently. The epithelial character of these confluent cells was documented by the presence of tight junctions using a freeze-fracture technique and transmission electron microscopy. A toxic effect of the particles incubated with these cells was largely excluded. The interaction of the microparticles with the epithelial cells was observed using confocal microscopy and live cell imaging. Interestingly, the particles entered the epithelial cells within hours. After 1 day, the intracellular particles began to disaggregate and release the silica nanoparticles. Thus, even epithelial cells may serve as targets for this novel carrier and gene delivery system. This is particularly important since safe and effective gene delivery remains an unsolved problem. In addition, delivery of anti-cancer and anti-infective drugs may be an application of this novel particulate carrier.
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Affiliation(s)
- Thomas Tschernig
- Institute of Anatomy and Cell Biology, Saarland University, D-66421 Homburg/Saar, Germany
| | - Thorben Fischer
- Department of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, Saarland University, D-66123 Saarbrücken, Germany
| | - Alexander Grissmer
- Institute of Anatomy and Cell Biology, Saarland University, D-66421 Homburg/Saar, Germany
| | - Anja Beckmann
- Institute of Anatomy and Cell Biology, Saarland University, D-66421 Homburg/Saar, Germany
| | - Carola Meier
- Institute of Anatomy and Cell Biology, Saarland University, D-66421 Homburg/Saar, Germany
| | - Peter Lipp
- Institute of Anatomy and Cell Biology, Saarland University, D-66421 Homburg/Saar, Germany.,Center for Molecular Signalling (PZMS), Saarland University, D-66421 Homburg/Saar, Germany
| | - Marc Schneider
- Department of Pharmacy, Biopharmaceutics and Pharmaceutical Technology, Saarland University, D-66123 Saarbrücken, Germany
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Reil JC, Tauchnitz M, Tian Q, Hohl M, Linz D, Oberhofer M, Kaestner L, Reil GH, Thiele H, Steendijk P, Böhm M, Neuberger HR, Lipp P. Hyperaldosteronism induces left atrial systolic and diastolic dysfunction. Am J Physiol Heart Circ Physiol 2016; 311:H1014-H1023. [DOI: 10.1152/ajpheart.00261.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Accepted: 08/09/2016] [Indexed: 11/22/2022]
Abstract
Patients with hypertension and hyperaldosteronism show an increased risk of stroke compared with patients with essential hypertension. Aim of the study was to assess the effects of aldosterone on left atrial function in rats as a potential contributor to thromboembolism. Osmotic mini-pumps delivering 1.5 μg aldosterone/h were implanted in rats subcutaneously (Aldo, n = 39; controls, n = 38). After 8 wk, left ventricular pressure-volume analysis of isolated working hearts was performed, and left atrial systolic and diastolic function was also assessed by atrial pressure-diameter loops. Moreover, left atrial myocytes were isolated to investigate their global and local Ca2+ handling and contractility. At similar heart rates, pressure-volume analysis of isolated hearts and in vivo hemodynamic measurements revealed neither systolic nor diastolic left ventricular dysfunction in Aldo. In particular, atrial filling pressures and atrial size were not increased in Aldo. Aldo rats showed a significant reduction of atrial late diastolic A wave, atrial active work index, and increased V waves. Consistently, in Aldo rats, sarcomere shortening and the amplitude of electrically evoked global Ca2+ transients were substantially reduced. Sarcoplasmic reticulum-Ca2+ content and fractional Ca2+ release were decreased, substantiated by a reduced sarcoplasmic reticulum calcium ATPase activity, resulting from a reduced CAMKII-evoked phosphorylation of phospholamban. Hyperaldosteronism induced atrial systolic and diastolic dysfunction, while atrial size and left ventricular hemodynamics, including filling pressures, were unaffected in rats. The described model suggests a direct causal link between hyperaldosteronism and decreased atrial contractility and diastolic compliance.
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Affiliation(s)
- Jan-Christian Reil
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
- Klinik für Innere Medizin II, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitäres Herzzentrum Lübeck, Universitätsklinikum Schleswig-Holstein, Lübeck, Germany
| | - Marcus Tauchnitz
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Qinghai Tian
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, Homburg/Saar, Germany
| | - Mathias Hohl
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Dominik Linz
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Martin Oberhofer
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, Homburg/Saar, Germany
| | - Lars Kaestner
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, Homburg/Saar, Germany
| | - Gert-Hinrich Reil
- Klinik für Innere Medizin I, Kardiologie, Klinikum Oldenburg, Oldenburg, Germany
| | - Holger Thiele
- Klinik für Innere Medizin II, Kardiologie, Angiologie und Internistische Intensivmedizin, Universitäres Herzzentrum Lübeck, Universitätsklinikum Schleswig-Holstein, Lübeck, Germany
| | - Paul Steendijk
- Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands; and
| | - Michael Böhm
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
| | - Hans-Ruprecht Neuberger
- Klinik für Innere Medizin III (Kardiologie, Angiologie, Internistische Intensivmedizin), Universitätsklinikum des Saarlandes, Homburg/Saar, Germany
- Klinikum Traunstein, Sektion Rhythmologie, Traunstein, Germany
| | - Peter Lipp
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, Homburg/Saar, Germany
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Zhang L, Lu X, Gui L, Wu Y, Sims SM, Wang G, Feng Q. Inhibition of Rac1 reduces store overload-induced calcium release and protects against ventricular arrhythmia. J Cell Mol Med 2016; 20:1513-22. [PMID: 27222313 PMCID: PMC4956946 DOI: 10.1111/jcmm.12840] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 02/14/2016] [Indexed: 12/20/2022] Open
Abstract
Rac1 is a small GTPase and plays key roles in multiple cellular processes including the production of reactive oxygen species (ROS). However, whether Rac1 activation during myocardial ischaemia and reperfusion (I/R) contributes to arrhythmogenesis is not fully understood. We aimed to study the effects of Rac1 inhibition on store overload‐induced Ca2+ release (SOICR) and ventricular arrhythmia during myocardial I/R. Adult Rac1f/f and cardiac‐specific Rac1 knockdown (Rac1ckd) mice were subjected to myocardial I/R and their electrocardiograms (ECGs) were monitored for ventricular arrhythmia. Myocardial Rac1 activity was increased and ventricular arrhythmia was induced during I/R in Rac1f/f mice. Remarkably, I/R‐induced ventricular arrhythmia was significantly decreased in Rac1ckd compared to Rac1f/f mice. Furthermore, treatment with Rac1 inhibitor NSC23766 decreased I/R‐induced ventricular arrhythmia. Ca2+ imaging analysis showed that in response to a 6 mM external Ca2+ concentration challenge, SOICR was induced with characteristic spontaneous intracellular Ca2+ waves in Rac1f/f cardiomyocytes. Notably, SOICR was diminished by pharmacological and genetic inhibition of Rac1 in adult cardiomyocytes. Moreover, I/R‐induced ROS production and ryanodine receptor 2 (RyR2) oxidation were significantly inhibited in the myocardium of Rac1ckd mice. We conclude that Rac1 activation induces ventricular arrhythmia during myocardial I/R. Inhibition of Rac1 suppresses SOICR and protects against ventricular arrhythmia. Blockade of Rac1 activation may represent a new paradigm for the treatment of cardiac arrhythmia in ischaemic heart disease.
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Affiliation(s)
- Lili Zhang
- Institute of Pathology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada
| | - Xiangru Lu
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada
| | - Le Gui
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada.,Nantong University Medical School, Nantong, China
| | - Yan Wu
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada.,Metabolic Syndrome Research Center, Second Xiangya Hospital, Central South University, Changsha, China
| | - Stephen M Sims
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada
| | - Guoping Wang
- Institute of Pathology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qingping Feng
- Department of Physiology and Pharmacology, University of Western Ontario, London, ON, Canada.,Lawson Health Research Institute, London, ON, Canada
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7
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Endothelin-1-induced remodelling of murine adult ventricular myocytes. Cell Calcium 2016; 59:41-53. [DOI: 10.1016/j.ceca.2015.12.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 12/17/2015] [Accepted: 12/22/2015] [Indexed: 11/30/2022]
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Wiesen K, Kaiser E, Schröder L, Scholz A, Ruppenthal S, Reil JC, Backes C, Meese E, Meier C, Bogdanova A, Lipp P, Kaestner L. Cardiac remodeling in Gαq and Gα11 knockout mice. Int J Cardiol 2015; 202:836-45. [PMID: 26476043 DOI: 10.1016/j.ijcard.2015.10.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 09/29/2015] [Accepted: 10/03/2015] [Indexed: 01/19/2023]
Abstract
BACKGROUND Although both Gαq- and Gα11-protein signaling are believed to be involved in the regulation of cardiac hypertrophy, their detailed contribution to myocardial function remains elusive. METHODS AND RESULTS We studied remodeling processes in healthy transgenic mice with genetically altered Gαq/Gα11-expression, in particular a global Gα11-knockout and a novel inducible cardiac specific Gαq-knockout, as well as a combined double knockout (dKO) mouse line. Echocardiography and telemetric ECG recordings revealed that compared with wild type mice, hearts of dKO mice showed an increased ejection fraction and a decreased heart rate, irrespective of age resulting in a maintained cardiac output. We attributed these findings to the lack of Gα11, which the absence was associated with a decreased afterload. Histological analysis of the extracellular matrix in the heart depicted a diminished presence of collagen in aging hearts of dKO mice compared to wild-type mice. The results of a transcriptome analysis on isolated ventricular cardiac myocytes revealed alterations of the activity of genes involved in the Gαq/Gα11-dependent regulation of the extracellular matrix, such as the matricellular protein Cyr61. CONCLUSIONS From our data we conclude that Gαq/Gα11 signaling pathways play a pivotal role in maintaining gene activity patterns. For the heart we revealed their importance in modulating the properties of the extracellular matrix, a mechanism that might be an important contributor and mechanistic basis for the development of pressure-overload induced cardiac hypertrophy.
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Affiliation(s)
- Kathrina Wiesen
- Institute of Veterinary Physiology, Vetsuisse Faculty and the Zürich Center for Integrative Human Physiology, University of Zürich, 8057 Zürich, Switzerland; Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany
| | - Elisabeth Kaiser
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany
| | - Laura Schröder
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany
| | - Anke Scholz
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany
| | - Sandra Ruppenthal
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany
| | - Jan-Christian Reil
- Clinic for Internal Medicine III, Saarland University, 66421 Homburg/Saar, Germany
| | - Christina Backes
- Institute for Human Genetics, Saarland University, 66421 Homburg/Saar, Germany
| | - Eckart Meese
- Institute for Human Genetics, Saarland University, 66421 Homburg/Saar, Germany
| | - Carola Meier
- Anatomy, Saarland University, 66421 Homburg/Saar, Germany
| | - Anna Bogdanova
- Institute of Veterinary Physiology, Vetsuisse Faculty and the Zürich Center for Integrative Human Physiology, University of Zürich, 8057 Zürich, Switzerland
| | - Peter Lipp
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany.
| | - Lars Kaestner
- Institute for Molecular Cell Biology and Research Centre for Molecular Imaging and Screening, Saarland University, 66421 Homburg/Saar, Germany.
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Nothdurft FP, Fontana D, Ruppenthal S, May A, Aktas C, Mehraein Y, Lipp P, Kaestner L. Differential Behavior of Fibroblasts and Epithelial Cells on Structured Implant Abutment Materials: A Comparison of Materials and Surface Topographies. Clin Implant Dent Relat Res 2014; 17:1237-49. [PMID: 25066589 DOI: 10.1111/cid.12253] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PURPOSE The aim of this study was to compare the proliferation and attachment behavior of fibroblasts and epithelial cells on differently structured abutment materials. MATERIALS AND METHODS Three different surface topographies were prepared on zirconia and titanium alloy specimens and defined as follows: machined (as delivered without further surface modification), smooth (polished), and rough (sandblasted). Energy-dispersive X-ray spectroscopy, topographical analysis, and water contact angle measurements were used to analyze the surface properties. Fibroblasts (HGF1) and epithelial cells (HNEpC) grown on the specimens were investigated 24 hours and 72 hours after seeding and counted using fluorescence imaging. To investigate adhesion, the abundance and arrangement of the focal adhesion protein vinculin were evaluated by immunocytochemistry. RESULTS Similar surface topographies were created on both materials. Fibroblasts exhibited significant higher proliferation rates on comparable surface topographies of zirconia compared with the titanium alloy. The proliferation of fibroblasts and epithelial cells was optimal on different substrate/topography combinations. Cell spreading was generally higher on polished and machined surfaces than on sandblasted surfaces. Rough surfaces provided favorable properties in terms of cellular adhesion of fibroblasts but not of epithelial cells. CONCLUSIONS Our data support complex soft tissue cell-substrate interactions: the fibroblast and epithelial cell response is influenced by both the material and surface topography.
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Affiliation(s)
- Frank P Nothdurft
- Department of Prosthetic Dentistry and Dental Materials Sciences, Saarland University, Homburg/Saar, Germany
| | - Dorothee Fontana
- Institute for Molecular Cell Biology, Saarland University, Homburg/Saar, Germany
| | - Sandra Ruppenthal
- Institute for Molecular Cell Biology, Saarland University, Homburg/Saar, Germany
| | - Alexander May
- CVD/Biosurfaces, Leibniz Institute for New Materials, Saarbrücken, Germany
| | - Cenk Aktas
- Division CVD/Biosurfaces, Leibniz Institute for New Materials, Saarbrücken, Germany
| | - Yasmin Mehraein
- Institute of Human Genetics, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Peter Lipp
- Institute for Molecular Cell Biology, Saarland University, Homburg/Saar, Germany
| | - Lars Kaestner
- Research Center for Molecular Imaging and Screening, Institute for Molecular Cell Biology, Saarland University, Homburg/Saar, Germany
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