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Gimsa J, Wysotzki P, Perutkova Š, Weihe T, Elter P, Marszałek P, Kralj-Iglič V, Müller T, Iglič A. Spermidine-Induced Attraction of Like-Charged Surfaces Is Correlated with the pH-Dependent Spermidine Charge: Force Spectroscopy Characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2725-2733. [PMID: 29382192 DOI: 10.1021/acs.langmuir.7b04199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ubiquitous molecule spermidine is known for its pivotal roles in the contact mediation, fusion, and reorganization of biological membranes and DNA. In our model system, borosilicate beads were attached to atomic force microscopy cantilevers and used to probe mica surfaces to study the details of the spermidine-induced attractions. The negative surface charges of both materials were largely constant over the measured pH range of pH 7.8 to 12. The repulsion observed between the surfaces turned into attraction after the addition of spermidine. The attractive force was correlated with the degree of spermidine protonation, which changed from +3 to +1 over the measured pH range. The force was maximal at pH 7.8. To explain the observed pH and spermidine concentration dependence, two different theoretical approaches were used: a chemical model of the charge equilibrium of spermidine and Monte-Carlo simulations of the orientation of the rodlike spermidine molecules in the gap between the borosilicate and mica surfaces. Monte-Carlo simulations of the orientational ordering of the rodlike spermidine molecules suggested the induction of attractive interactions between the surfaces if the gap was bridged by the molecules. For larger gaps, the orientational distribution function of the spermidine molecules predicted a considerable degree of parallel attachment of the molecules to the surfaces, resulting in reduced effective surface charge densities of both surfaces, which reduced their electrostatic repulsion.
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Affiliation(s)
- Jan Gimsa
- Department of Biophysics, Faculty of Natural Sciences, University of Rostock , 18057 Rostock, Germany
| | - Philipp Wysotzki
- Department of Biophysics, Faculty of Natural Sciences, University of Rostock , 18057 Rostock, Germany
| | - Šarka Perutkova
- Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana , 1000 Ljubljana, Slovenia
| | - Thomas Weihe
- Leibniz Institute for Plasma Science and Technology , 17489 Greifswald, Germany
| | - Patrick Elter
- Department of Life Science Engineering, University of Applied Sciences Mittelhessen , 35390 Gießen, Germany
| | - Piotr Marszałek
- Department of Mechanical Engineering and Material Science, and Center for Biologically Inspired Materials and Material Systems, Duke University , Durham, North Carolina 27708, United States
| | - Veronika Kralj-Iglič
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana , 1000 Ljubljana, Slovenia
| | - Torsten Müller
- R&D Department, JPK Instruments AG , 12099 Berlin, Germany
| | - Aleš Iglič
- Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana , 1000 Ljubljana, Slovenia
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Kulkarni M, Mazare A, Gongadze E, Perutkova Š, Kralj-Iglič V, Milošev I, Schmuki P, Mozetič M. Titanium nanostructures for biomedical applications. NANOTECHNOLOGY 2015; 26:062002. [PMID: 25611515 DOI: 10.1088/0957-4484/26/6/062002] [Citation(s) in RCA: 224] [Impact Index Per Article: 24.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Titanium and titanium alloys exhibit a unique combination of strength and biocompatibility, which enables their use in medical applications and accounts for their extensive use as implant materials in the last 50 years. Currently, a large amount of research is being carried out in order to determine the optimal surface topography for use in bioapplications, and thus the emphasis is on nanotechnology for biomedical applications. It was recently shown that titanium implants with rough surface topography and free energy increase osteoblast adhesion, maturation and subsequent bone formation. Furthermore, the adhesion of different cell lines to the surface of titanium implants is influenced by the surface characteristics of titanium; namely topography, charge distribution and chemistry. The present review article focuses on the specific nanotopography of titanium, i.e. titanium dioxide (TiO2) nanotubes, using a simple electrochemical anodisation method of the metallic substrate and other processes such as the hydrothermal or sol-gel template. One key advantage of using TiO2 nanotubes in cell interactions is based on the fact that TiO2 nanotube morphology is correlated with cell adhesion, spreading, growth and differentiation of mesenchymal stem cells, which were shown to be maximally induced on smaller diameter nanotubes (15 nm), but hindered on larger diameter (100 nm) tubes, leading to cell death and apoptosis. Research has supported the significance of nanotopography (TiO2 nanotube diameter) in cell adhesion and cell growth, and suggests that the mechanics of focal adhesion formation are similar among different cell types. As such, the present review will focus on perhaps the most spectacular and surprising one-dimensional structures and their unique biomedical applications for increased osseointegration, protein interaction and antibacterial properties.
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Affiliation(s)
- M Kulkarni
- Laboratory of Biophysics, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana SI-1000, Slovenia. Department of Materials Science and Engineering, Chair of Surface Science and Corrosion, University of Erlangen-Nuremberg, WW4-LKO, Erlangen, Germany
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Kralj-Iglič V. Membrane Microvesiculation and its Suppression. ADVANCES IN PLANAR LIPID BILAYERS AND LIPOSOMES 2015. [DOI: 10.1016/bs.adplan.2015.06.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Perutková Š, Frank-Bertoncelj M, Rozman B, Kralj-Iglič V, Iglič A. Influence of ionic strength and beta2-glycoprotein I concentration on agglutination of like-charged phospholipid membranes. Colloids Surf B Biointerfaces 2013; 111:699-706. [DOI: 10.1016/j.colsurfb.2013.05.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Revised: 05/28/2013] [Accepted: 05/30/2013] [Indexed: 10/26/2022]
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A 32-month follow-up study of nanovesicle concentrations in blood from 12 patients with gastrointestinal stromal tumour treated with imatinib. Biochem Soc Trans 2013; 41:303-8. [DOI: 10.1042/bst20120247] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Clinical studies have indicated that the NV (nanovesicle) concentration in blood samples is a potential indicator of clinical status and can be used to follow the development of the disease. For 32 months, we monitored the effect of imatinib treatment on NV concentrations in blood samples from 12 patients with GIST (gastrointestinal stromal tumour). The NV concentration before the treatment increased with respect to control by a factor of 3.5 on average (range 2.6–9.2). The first week after initiation of the treatment, the NV concentration increased considerably, by a factor of 13 on average (range 5.9–21.2), whereas on average, after 1 month, it decreased to the level of the control and remained at that level for at least 1.5 years. Recent assessment (after 2.5 years) showed a somewhat increased NV concentration, by a factor of 2 on average (range 0.7–3.9). Low NV concentrations in blood samples during the treatment reflect a favourable effect of imatinib in these patients and no remission of the disease was hitherto observed.
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Šimundić M, Drašler B, Šuštar V, Zupanc J, Štukelj R, Makovec D, Erdogmus D, Hägerstrand H, Drobne D, Kralj-Iglič V. Effect of engineered TiO2 and ZnO nanoparticles on erythrocytes, platelet-rich plasma and giant unilamelar phospholipid vesicles. BMC Vet Res 2013; 9:7. [PMID: 23311901 PMCID: PMC3549938 DOI: 10.1186/1746-6148-9-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Accepted: 01/08/2013] [Indexed: 01/28/2023] Open
Abstract
Background Massive industrial production of engineered nanoparticles poses questions about health risks to living beings. In order to understand the underlying mechanisms, we studied the effects of TiO2 and ZnO agglomerated engineered nanoparticles (EPs) on erythrocytes, platelet-rich plasma and on suspensions of giant unilamelar phospholipid vesicles. Results Washed erythrocytes, platelet-rich plasma and suspensions of giant unilamelar phospholipid vesicles were incubated with samples of EPs. These samples were observed by different microscopic techniques. We found that TiO2 and ZnO EPs adhered to the membrane of washed human and canine erythrocytes. TiO2 and ZnO EPs induced coalescence of human erythrocytes. Addition of TiO2 and ZnO EPs to platelet-rich plasma caused activation of human platelets after 24 hours and 3 hours, respectively, while in canine erythrocytes, activation of platelets due to ZnO EPs occurred already after 1 hour. To assess the effect of EPs on a representative sample of giant unilamelar phospholipid vesicles, analysis of the recorded populations was improved by applying the principles of statistical physics. TiO2 EPs did not induce any notable effect on giant unilamelar phospholipid vesicles within 50 minutes of incubation, while ZnO EPs induced a decrease in the number of giant unilamelar phospholipid vesicles that was statistically significant (p < 0,001) already after 20 minutes of incubation. Conclusions These results indicate that TiO2 and ZnO EPs cause erythrocyte aggregation and could be potentially prothrombogenic, while ZnO could also cause membrane rupture.
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Affiliation(s)
- Metka Šimundić
- Biomedical Research Group, Faculty of Health Sciences, University of Ljubljana, Ljubljana, Slovenia
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Mareš T, Daniel M, Iglič A, Kralj-Iglič V, Fošnarič M. Determination of the strength of adhesion between lipid vesicles. ScientificWorldJournal 2012; 2012:146804. [PMID: 22312321 PMCID: PMC3261509 DOI: 10.1100/2012/146804] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Accepted: 11/02/2011] [Indexed: 12/16/2022] Open
Abstract
A commonly used method to determine the strength of adhesion between adhering lipid vesicles is measuring their effective contact angle from experimental images. The aim of this paper is to estimate the interobserver variations in vesicles effective contact angle measurements and to propose a new method for estimating the strength of membrane vesicle adhesion. Theoretical model shows for the old and for the new measure a monotonic dependence on the strength of adhesion. Results obtained by both measuring techniques show statistically significant correlation and high interobserver reliability for both methods. Therefore the conventional method of measuring the effective contact angle gives qualitatively relevant results as the measure of the lipid vesicle adhesion. However, the new measuring technique provides a lower variation of the measured values than the conventional measures using the effective contact angle. Moreover, obtaining the adhesion angle can be automatized more easily than obtaining the effective contact angle.
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Affiliation(s)
- Tomáš Mareš
- Laboratory of Biomechanics, Faculty of Mechanical Engineering, CTU in Prague, Technická 4, 166 07 Prague 6, Czech Republic
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Ortega-Hernandez OD, Agmon-Levin N, Blank M, Asherson RA, Shoenfeld Y. The Pathophysiology of the Catastrophic Antiphospholipid Syndrome: Compelling Evidence. Clin Rev Allergy Immunol 2010. [DOI: 10.1007/s12016-008-8110-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Interaction between equally charged membrane surfaces mediated by positively and negatively charged macro-ions. J Membr Biol 2010; 236:43-53. [PMID: 20623113 DOI: 10.1007/s00232-010-9278-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Accepted: 06/11/2010] [Indexed: 10/19/2022]
Abstract
In biological systems, charged membrane surfaces are surrounded by charged molecules such as electrolyte ions and proteins. Our recent experiments in the systems of giant phospholipid vesicles indicated that some of the blood plasma proteins (macro-ions) may promote adhesion between equally charged membrane surfaces. In this work, theory was put forward to describe an IgG antibody-mediated attractive interaction between negatively charged membrane surfaces which was observed in experiments on giant phospholipid vesicles with cardiolipin-containing membranes. The attractive interactions between negatively charged membrane surfaces in the presence of negatively and positively charged spherical macro-ions are explained using functional density theory and Monte Carlo simulations. Both, the rigorous solution of the variational problem within the functional density theory and the Monte Carlo simulations show that spatial and orientational ordering of macro-ions may give rise to an attractive interaction between negatively charged membrane surfaces. It is also shown that the distinctive spatial distribution of the charge within the macro-ions (proteins) is essential in this process.
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Frank M, Sodin-Šemrl S, Rozman B, Potočnik M, Kralj-Iglič V. Effects of Low-Molecular-Weight Heparin on Adhesion and Vesiculation of Phospholipid Membranes. Ann N Y Acad Sci 2009; 1173:874-86. [DOI: 10.1111/j.1749-6632.2009.04745.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Schara K, Janša V, Šuštar V, Dolinar D, Pavlič JI, Lokar M, Kralj-Iglič V, Veranič P, Iglič A. Mechanisms for the formation of membranous nanostructures in cell-to-cell communication. Cell Mol Biol Lett 2009; 14:636-56. [PMID: 19554268 PMCID: PMC6275886 DOI: 10.2478/s11658-009-0018-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2008] [Accepted: 06/18/2009] [Indexed: 12/21/2022] Open
Abstract
Cells interact by exchanging material and information. Two methods of cell-to-cell communication are by means of microvesicles and by means of nanotubes. Both microvesicles and nanotubes derive from the cell membrane and are able to transport the contents of the inner solution. In this review, we describe two physical mechanisms involved in the formation of microvesicles and nanotubes: curvature-mediated lateral redistribution of membrane components with the formation of membrane nanodomains; and plasmamediated attractive forces between membranes. These mechanisms are clinically relevant since they can be affected by drugs. In particular, the underlying mechanism of heparin's role as an anticoagulant and tumor suppressor is the suppression of microvesicluation due to plasma-mediated attractive interaction between membranes.
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Affiliation(s)
- Karin Schara
- Laboratory of Clinical Biophysics, Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
- University Medical Centre Ljubljana, Zaloška 9, SI-1000 Ljubljana, Slovenia
| | - Vid Janša
- Laboratory of Clinical Biophysics, Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
| | - Vid Šuštar
- Laboratory of Clinical Biophysics, Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
| | - Drago Dolinar
- Laboratory of Clinical Biophysics, Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
- University Medical Centre Ljubljana, Zaloška 9, SI-1000 Ljubljana, Slovenia
| | - Janez Ivan Pavlič
- Faculty of Health Studies, University of Ljubljana, Poljanska 26a, SI-1000 Ljubljana, Slovenia
- Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000 Ljubljana, Slovenia
| | - Maruša Lokar
- Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000 Ljubljana, Slovenia
| | - Veronika Kralj-Iglič
- Laboratory of Clinical Biophysics, Institute of Biophysics, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
| | - Peter Veranič
- Institute of Cell Biology, Faculty of Medicine, University of Ljubljana, Lipičeva 2, SI-1000 Ljubljana, Slovenia
| | - Aleš Iglič
- Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000 Ljubljana, Slovenia
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Bucciarelli S, Erkan D, Espinosa G, Cervera R. Catastrophic antiphospholipid syndrome: treatment, prognosis, and the risk of relapse. Clin Rev Allergy Immunol 2009; 36:80-4. [PMID: 19051065 DOI: 10.1007/s12016-008-8107-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The "catastrophic" variant of the antiphospholipid syndrome (APS) is characterized by multiple vascular occlusive events, usually affecting small vessels and developing over a short period of time. Although patients with catastrophic APS represent less than 1% of all patients with APS, they are usually in a life-threatening situation with a 50% mortality rate. The purpose of this paper is to review the treatment strategies and prognostic factors in patients with catastrophic APS. A detailed description of the clinical and laboratory features of the syndrome can be found in the other articles of this issue.
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Shoenfeld Y, Gershwin ME, Cervera R. Ronald A. Asherson—“In Memoriam”. Clin Rev Allergy Immunol 2009. [DOI: 10.1007/s12016-008-8111-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Šuštar V, Janša R, Frank M, Hagerstrand H, Kržan M, Iglič A, Kralj-Iglič V. Suppression of membrane microvesiculation — A possible anticoagulant and anti-tumor progression effect of heparin. Blood Cells Mol Dis 2009; 42:223-7. [DOI: 10.1016/j.bcmd.2009.01.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Accepted: 01/20/2009] [Indexed: 01/12/2023]
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Beta2-glycoprotein I and annexin A5 phospholipid interactions: artificial and cell membranes. Autoimmun Rev 2009; 9:5-10. [PMID: 19232551 DOI: 10.1016/j.autrev.2009.02.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2009] [Accepted: 02/11/2009] [Indexed: 11/20/2022]
Abstract
The aim of this report was an overview of beta2-glycoprotein I (beta2-GPI)- and annexin A5 (AnxA5)-phospholipid interactions including candidate beta2-GPI receptors, and their relevance to the investigation of physiological/pathological processes. Both beta2-GPI and AnxA5 have thrombomodulatory functions in vivo and their antigenicity is particularly important for thrombotic manifestations and pregnancy complications in antiphospholipid syndrome. Specific elements of beta2-GPI- and AnxA5-phospholipid interactions are different. The crucial elements for beta2-GPI are conformational change and dimerization, both of which are also required and necessary for receptor signaling, leading to the prothombotic state. AnxA5 differs in its ability to crystallize into a protective shield, the disruption of which seems to be the major prothrombotic mechanism. These differences may explain some of the functional consequences of both molecules seen in the pathological conditions. Future alternative therapies of antiphospholipid syndrome are proposed to be based on the expanding knowledge of beta2-GPI- and AnxA5-phospholipid interactions, specifically antagonizing beta2-GPI receptors, as well as inhibiting their signaling pathways.
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Number of microvesicles in peripheral blood and ability of plasma to induce adhesion between phospholipid membranes in 19 patients with gastrointestinal diseases. Blood Cells Mol Dis 2008; 41:124-32. [DOI: 10.1016/j.bcmd.2008.01.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2008] [Accepted: 01/29/2008] [Indexed: 11/18/2022]
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Chapter 8 Interactions of Phospholipid Binding Proteins with Negatively Charged Membranes. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1554-4516(08)00208-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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