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Drescher D, Büchner T, Schrade P, Traub H, Werner S, Guttmann P, Bachmann S, Kneipp J. Influence of Nuclear Localization Sequences on the Intracellular Fate of Gold Nanoparticles. ACS Nano 2021; 15:14838-14849. [PMID: 34460234 DOI: 10.1021/acsnano.1c04925] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Directing nanoparticles to the nucleus by attachment of nuclear localization sequences (NLS) is an aim in many applications. Gold nanoparticles modified with two different NLS were studied while crossing barriers of intact cells, including uptake, endosomal escape, and nuclear translocation. By imaging of the nanoparticles and by characterization of their molecular interactions with surface-enhanced Raman scattering (SERS), it is shown that nuclear translocation strongly depends on the particular incubation conditions. After an 1 h of incubation followed by a 24 h chase time, 14 nm gold particles carrying an adenoviral NLS are localized in endosomes, in the cytoplasm, and in the nucleus of fibroblast cells. In contrast, the cells display no nanoparticles in the cytoplasm or nucleus when continuously incubated with the nanoparticles for 24 h. The ultrastructural and spectroscopic data indicate different processing of NLS-functionalized particles in endosomes compared to unmodified particles. NLS-functionalized nanoparticles form larger intraendosomal aggregates than unmodified gold nanoparticles. SERS spectra of cells with NLS-functionalized gold nanoparticles contain bands assigned to DNA and were clearly different from those with unmodified gold nanoparticles. The different processing in the presence of an NLS is influenced by a continuous exposure of the cells to nanoparticles and an ongoing nanoparticle uptake. This is supported by mass-spectrometry-based quantification that indicates enhanced uptake of NLS-functionalized nanoparticles compared to unmodified particles under the same conditions. The results contribute to the optimization of nanoparticle analysis in cells in a variety of applications, e.g., in theranostics, biotechnology, and bioanalytics.
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Affiliation(s)
- Daniela Drescher
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Tina Büchner
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
| | - Petra Schrade
- Core Facility für Elektronenmikroskopie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Heike Traub
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Straße 11, 12489 Berlin, Germany
| | - Stephan Werner
- Department of X-ray Microscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Peter Guttmann
- Department of X-ray Microscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany
| | - Sebastian Bachmann
- Core Facility für Elektronenmikroskopie, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
- Department of Anatomy, Charité Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
| | - Janina Kneipp
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
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Peter Szekeres G, Werner S, Guttmann P, Spedalieri C, Drescher D, Živanović V, Montes-Bayón M, Bettmer J, Kneipp J. Relating the composition and interface interactions in the hard corona of gold nanoparticles to the induced response mechanisms in living cells. Nanoscale 2020; 12:17450-17461. [PMID: 32856032 DOI: 10.1039/d0nr03581e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Understanding the formation of the intracellular protein corona of nanoparticles is essential for a wide range of bio- and nanomedical applications. The innermost layer of the protein corona, the hard corona, directly interacts with the nanoparticle surface, and by shielding the surface, it has a deterministic effect on the intracellular processing of the nanoparticle. Here, we combine a direct qualitative analysis of the hard corona composition of gold nanoparticles with a detailed structural characterization of the molecules in their interaction with the nanoparticle surface and relate both to the effects they have on the ultrastructure of living cells and the processing of the gold nanoparticles. Cells from the cell lines HCT-116 and A549 were incubated with 30 nm citrate-stabilized gold nanoparticles and with their aggregates in different culture media. The combined results of mass spectrometry based proteomics, cryo soft X-ray nanotomography and surface-enhanced Raman scattering experiments together revealed different uptake mechanisms in the two cell lines and distinct levels of induced cellular stress when incubation conditions were varied. The data indicate that the different incubation conditions lead to changes in the nanoparticle processing via different protein-nanoparticle interfacial interactions. Specifically, they suggest that the protein-nanoparticle surface interactions depend mainly on the surface properties of the gold nanoparticles, that is, the ζ-potential and the resulting changes in the hydrophilicity of the nanoparticle surface, and are largely independent of the cell line, the uptake mechanism and intracellular processing, or the extent of the induced cellular stress.
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Affiliation(s)
- Gergo Peter Szekeres
- Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof, Albert-Einstein-Str. 5-9, 12489 Berlin, Germany.
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Živanović V, Seifert S, Drescher D, Schrade P, Werner S, Guttmann P, Szekeres GP, Bachmann S, Schneider G, Arenz C, Kneipp J. Optical Nanosensing of Lipid Accumulation due to Enzyme Inhibition in Live Cells. ACS Nano 2019; 13:9363-9375. [PMID: 31314989 DOI: 10.1021/acsnano.9b04001] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Drugs that influence enzymes of lipid metabolism can cause pathological accumulation of lipids in animal cells. Here, gold nanoparticles, acting as nanosensors that deliver surface-enhanced Raman scattering (SERS) spectra from living cells provide molecular evidence of lipid accumulation in lysosomes after treatment of cultured cells with the three tricyclic antidepressants (TCA) desipramine, amitryptiline, and imipramine. The vibrational spectra elucidate to great detail and with very high sensitivity the composition of the drug-induced lipid accumulations, also observed in fixed samples by electron microscopy and X-ray nanotomography. The nanoprobes show that mostly sphingomyelin is accumulated in the lysosomes but also other lipids, in particular, cholesterol. The observation of sphingomyelin accumulation supports the impairment of the enzyme acid sphingomyelinase. The SERS data were analyzed by random forest based approaches, in particular, by minimal depth variable selection and surrogate minimal depth (SMD), shown here to be particularly useful machine learning tools for the analysis of the lipid signals that contribute only weakly to SERS spectra of cells. SMD is used for the identification of molecular colocalization and interactions of the drug molecules with lipid membranes and for discriminating between the biochemical effects of the three different TCA molecules, in agreement with their different activity. The spectra also indicate that the protein composition is significantly changed in cells treated with the drugs.
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Affiliation(s)
- Vesna Živanović
- Department of Chemistry , Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2 , 12489 Berlin , Germany
- School of Analytical Sciences Adlershof SALSA , Humboldt-Universität zu Berlin , Albert-Einstein-Strasse 5-9 , 12489 Berlin , Germany
| | - Stephan Seifert
- Institute of Medical Informatics and Statistics , Kiel University, University Hospital Schleswig-Holstein , 24105 Kiel , Germany
| | - Daniela Drescher
- Department of Chemistry , Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2 , 12489 Berlin , Germany
| | - Petra Schrade
- Department of Anatomy , Charité Universitätsmedizin Berlin , Berlin 10117 , Germany
| | - Stephan Werner
- Helmholtz-Zentrum Berlin für Materialien und Energie , BESSY II, Albert-Einstein-Strasse 15 , 12489 Berlin , Germany
| | - Peter Guttmann
- Helmholtz-Zentrum Berlin für Materialien und Energie , BESSY II, Albert-Einstein-Strasse 15 , 12489 Berlin , Germany
| | - Gergo Peter Szekeres
- Department of Chemistry , Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2 , 12489 Berlin , Germany
- School of Analytical Sciences Adlershof SALSA , Humboldt-Universität zu Berlin , Albert-Einstein-Strasse 5-9 , 12489 Berlin , Germany
| | - Sebastian Bachmann
- Department of Anatomy , Charité Universitätsmedizin Berlin , Berlin 10117 , Germany
| | - Gerd Schneider
- Helmholtz-Zentrum Berlin für Materialien und Energie , BESSY II, Albert-Einstein-Strasse 15 , 12489 Berlin , Germany
| | - Christoph Arenz
- Department of Chemistry , Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2 , 12489 Berlin , Germany
- School of Analytical Sciences Adlershof SALSA , Humboldt-Universität zu Berlin , Albert-Einstein-Strasse 5-9 , 12489 Berlin , Germany
| | - Janina Kneipp
- Department of Chemistry , Humboldt-Universität zu Berlin , Brook-Taylor-Strasse 2 , 12489 Berlin , Germany
- School of Analytical Sciences Adlershof SALSA , Humboldt-Universität zu Berlin , Albert-Einstein-Strasse 5-9 , 12489 Berlin , Germany
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Drescher D, Büchner T, Guttmann P, Werner S, Schneider G, Kneipp J. X-ray tomography shows the varying three-dimensional morphology of gold nanoaggregates in the cellular ultrastructure. Nanoscale Adv 2019; 1:2937-2945. [PMID: 36133586 PMCID: PMC9418343 DOI: 10.1039/c9na00198k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Accepted: 06/08/2019] [Indexed: 05/28/2023]
Abstract
The processing of nanoparticles inside eukaryotic cells is a key step in many wanted and unwanted nano-bio-interactions. In order to understand the effects and functions of the intracellular aggregates that are formed, their properties and their interaction with the biological matrix must be characterized. High quality synchrotron soft X-ray tomography (SXT) data were obtained from cells containing gold nanoparticles that are commonly applied as tools for optical probing or drug delivery. 3D volume rendering of both cellular organelles and the nanoparticle aggregates of different sizes in the intact cells of two cell lines reveals variation in localization, size, shape and density of the intracellular gold nanoaggregates. The dependence of such variation on incubation time and cell type, as well as on the influence of pre-aggregation of primary nanoparticles is shown. The SXT results provide a detailed picture of intracellular aggregation and will improve the design of safe and efficient nanoparticle platforms for biomedical use.
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Affiliation(s)
- Daniela Drescher
- Humboldt-Universität zu Berlin, Department of Chemistry Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Tina Büchner
- Humboldt-Universität zu Berlin, Department of Chemistry Brook-Taylor-Str. 2 12489 Berlin Germany
| | - Peter Guttmann
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Research Group X-ray Microscopy Albert-Einstein-Str. 15 12489 Berlin Germany
| | - Stephan Werner
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Research Group X-ray Microscopy Albert-Einstein-Str. 15 12489 Berlin Germany
| | - Gerd Schneider
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Research Group X-ray Microscopy Albert-Einstein-Str. 15 12489 Berlin Germany
| | - Janina Kneipp
- Humboldt-Universität zu Berlin, Department of Chemistry Brook-Taylor-Str. 2 12489 Berlin Germany
- School of Analytical Sciences Adlershof, Humboldt-Universität zu Berlin Albert-Einstein-Str. 5-9 12489 Berlin Germany
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Zivanovic V, Semini G, Laue M, Drescher D, Aebischer T, Kneipp J. Characterization of Lipids in Leishmania Infected Cells by SERS Microscopy. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.3038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Živanović V, Semini G, Laue M, Drescher D, Aebischer T, Kneipp J. Chemical Mapping of Leishmania Infection in Live Cells by SERS Microscopy. Anal Chem 2018; 90:8154-8161. [DOI: 10.1021/acs.analchem.8b01451] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Vesna Živanović
- School of Analytical Sciences Adlershof, Humboldt-Universität zu Berlin, Albert-Einstein-Strasse 5-9, 12489 Berlin, Germany
| | | | | | | | | | - Janina Kneipp
- School of Analytical Sciences Adlershof, Humboldt-Universität zu Berlin, Albert-Einstein-Strasse 5-9, 12489 Berlin, Germany
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Abstract
Leitet man ein EEG über ca. 20 Minuten ab und unterwirft es zwecks Untersuchung von Kurzzeiteffekten in Abschnitten von wenigen Sekunden einer Spektralanalyse, so erhält man eine Reihe von mehreren 100 Spektren. Dies ist eine Datenfülle, die am besten in dreidimensionaler Darstellung anschaulich gemacht wird. Damit rhythmische Veränderungen der Grundaktivität, z.B. Schwankungen der Alpha-Aktivität (7,5—12,5 Hz Bereich), nicht in der beträchtlichen Varianz der einzelnen Spektralschätzer untergehen, werden die Stützpunkte mit Hilfe einer digitalen Filterung nacheinander einer Quer- und einer Längsglättung unterworfen.Ein besonderes Kennzeichen der hier präsentierten 3D-Darstellung ist, daß bei Eingabe verschiedener Dreh- und Kippwinkel die Zeitachse stets parallel zur Papierkante des Plotters verläuft, so daß dem Benutzer bzgl. der maximalen Anzahl der darstellbaren Spektren keine Beschränkungen auferlegt werden.
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Drescher D, Traub H, Büchner T, Jakubowski N, Kneipp J. Properties of in situ generated gold nanoparticles in the cellular context. Nanoscale 2017; 9:11647-11656. [PMID: 28770918 DOI: 10.1039/c7nr04620k] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Gold nanostructures that serve as probes for nanospectroscopic analysis of eukaryotic cell cultures can be obtained by the in situ reduction of tetrachloroauric acid (HAuCl4). To understand the formation process of such intracellularly grown particles depending on the incubation medium, the reaction was carried out with 3T3 fibroblast cells in three different incubation media, phosphate buffer, Dulbecco's Modified Eagle Medium (DMEM), and standard cell culture medium (DMEM with fetal calf serum). The size, the optical properties, the biomolecular corona, and the localization of the gold nanoparticles formed in situ vary for the different conditions. The combination of surface-enhanced Raman scattering (SERS) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) microscopic mapping and transmission electron microscopy (TEM) provides complementary perspectives on plasmonic nanoparticles and non-plasmonic gold compounds inside the cells. While for the incubation with HAuCl4 in PBS, gold particles provide optical signals from the nucleus, the incubation in standard cell culture medium leads to scavenging of the toxic molecules and the formation of spots of high gold concentration in the cytoplasm without formation of SERS-active particles inside the cells. The biomolecular corona of nanoparticles formed in situ after incubation in buffer and DMEM differs, suggesting that different intracellular molecular species serve for reduction and stabilization. Comparison with data obtained from ready-made gold nanoparticles suggests complementary application of in situ and ex situ generated nanostructures for optical probing.
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Affiliation(s)
- D Drescher
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany. and Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - H Traub
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - T Büchner
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - N Jakubowski
- Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - J Kneipp
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany. and Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Str. 11, 12489 Berlin, Germany
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Engl T, Drescher D, Bickeböller R, Grabhorn R. Fatigue, depression, and quality of life in patients with prostatic diseases. Cent European J Urol 2017; 70:44-47. [PMID: 28461987 PMCID: PMC5407337 DOI: 10.5173/ceju.2017.940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 11/27/2016] [Accepted: 01/10/2017] [Indexed: 11/22/2022] Open
Abstract
Introduction Fatigue and depression are commonly attributed to malignant and chronic benign diseases. However, these phenomena have been little investigated to date in prostatic diseases. Our aim was to compare fatigue and depression in prostate cancer patients treated with Androgen Deprivation Therapy (ADT) and in patients with Lower Urinary Tract Symptoms (LUTS) / Benign Prostatic Syndrome. Material and methods 100 patients each with PCa (prostate cancer) and BPS (Benign Prostatic Syndrome) were surveyed using the Brief Fatigue Inventory (BFI), EORTC-QLQ C30 [1], and Beck Depression Inventory (BDI). EORTC-QLQ-C30 was analyzed by the Mann-Whitney-U-Test. Results were analyzed using the MWUT, CST and ST. Results No differences were found between both groups in terms of fatigue (BFI). The prostate cancer group showed a significantly higher impairment in the EORTC-QLQ-C30 role function and fatigue score. We found differences on the BDI in regards to self-criticism with higher mean scores for LUTS patients, whereas loss of energy and loss of sexual interest were more relevant in prostate cancer patients. However, the overall mean score of both groups showed no difference. Conclusions This study compared fatigue, depression, and the quality of life in prostate cancer patients treated with ADT and patients with BPS/LUTS. The two groups do not differ in fatigue and depression levels.
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Affiliation(s)
- Tobias Engl
- Department of Urology, Goethe University, Frankfurt am Main, Germany
| | - Daniela Drescher
- Department of Urology, Goethe University, Frankfurt am Main, Germany
| | - Ralf Bickeböller
- Department of Urology, Goethe University, Frankfurt am Main, Germany
| | - Ralph Grabhorn
- Department of Psychiatry, Goethe University, Frankfurt am Main, Germany
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Büchner T, Drescher D, Merk V, Traub H, Guttmann P, Werner S, Jakubowski N, Schneider G, Kneipp J. Biomolecular environment, quantification, and intracellular interaction of multifunctional magnetic SERS nanoprobes. Analyst 2016; 141:5096-106. [PMID: 27353290 PMCID: PMC5038462 DOI: 10.1039/c6an00890a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 06/13/2016] [Indexed: 12/16/2022]
Abstract
Multifunctional composite nanoprobes consisting of iron oxide nanoparticles linked to silver and gold nanoparticles, Ag-Magnetite and Au-Magnetite, respectively, were introduced by endocytic uptake into cultured fibroblast cells. The cells containing the non-toxic nanoprobes were shown to be displaceable in an external magnetic field and can be manipulated in microfluidic channels. The distribution of the composite nanostructures that are contained in the endosomal system is discussed on the basis of surface-enhanced Raman scattering (SERS) mapping, quantitative laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) micromapping, and cryo soft X-ray tomography (cryo soft-XRT). Cryo soft-XRT of intact, vitrified cells reveals that the composite nanoprobes form intra-endosomal aggregates. The nanoprobes provide SERS signals from the biomolecular composition of their surface in the endosomal environment. The SERS data indicate the high stability of the nanoprobes and of their plasmonic properties in the harsh environment of endosomes and lysosomes. The spectra point at the molecular composition at the surface of the Ag-Magnetite and Au-Magnetite nanostructures that is very similar to that of other composite structures, but different from the composition of pure silver and gold SERS nanoprobes used for intracellular investigations. As shown by the LA-ICP-MS data, the uptake efficiency of the magnetite composites is approximately two to three times higher than that of the pure gold and silver nanoparticles.
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Affiliation(s)
- Tina Büchner
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Daniela Drescher
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Virginia Merk
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany. and Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), Albert-Einstein-Str. 5-9, 12489 Berlin, Germany
| | - Heike Traub
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - Peter Guttmann
- Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Stephan Werner
- Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Norbert Jakubowski
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
| | - Gerd Schneider
- Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - Janina Kneipp
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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Mueller L, Traub H, Jakubowski N, Drescher D, Baranov VI, Kneipp J. Trends in single-cell analysis by use of ICP-MS. Anal Bioanal Chem 2014; 406:6963-77. [PMID: 25270864 DOI: 10.1007/s00216-014-8143-7] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Revised: 08/14/2014] [Accepted: 08/28/2014] [Indexed: 10/24/2022]
Abstract
The analysis of single cells is a growing research field in many disciplines such as toxicology, medical diagnosis, drug and cancer research or metallomics, and different methods based on microscopic, mass spectrometric, and spectroscopic techniques are under investigation. This review focuses on the most recent trends in which inductively coupled plasma mass spectrometry (ICP-MS) and ICP optical emission spectrometry (ICP-OES) are applied for single-cell analysis using metal atoms being intrinsically present in cells, taken up by cells (e.g., nanoparticles), or which are artificially bound to a cell. For the latter, especially element tagged antibodies are of high interest and are discussed in the review. The application of different sample introduction systems for liquid analysis (pneumatic nebulization, droplet generation) and elemental imaging by laser ablation ICP-MS (LA-ICP-MS) of single cells are highlighted. Because of the high complexity of biological systems and for a better understanding of processes and dynamics of biologically or medically relevant cells, the authors discuss the idea of "multimodal spectroscopies."
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Affiliation(s)
- Larissa Mueller
- BAM Federal Institute for Materials Research and Testing, 12200, Berlin, Germany,
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Büchner T, Drescher D, Traub H, Schrade P, Bachmann S, Jakubowski N, Kneipp J. Relating surface-enhanced Raman scattering signals of cells to gold nanoparticle aggregation as determined by LA-ICP-MS micromapping. Anal Bioanal Chem 2014; 406:7003-14. [PMID: 25120183 DOI: 10.1007/s00216-014-8069-0] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 07/14/2014] [Accepted: 07/25/2014] [Indexed: 12/18/2022]
Abstract
The cellular response to nanoparticle exposure is essential in various contexts, especially in nanotoxicity and nanomedicine. Here, 14-nm gold nanoparticles in 3T3 fibroblast cells are investigated in a series of pulse-chase experiments with a 30-min incubation pulse and chase times ranging from 15 min to 48 h. The gold nanoparticles and their aggregates are quantified inside the cellular ultrastructure by laser ablation inductively coupled plasma mass spectrometry micromapping and evaluated regarding the surface-enhanced Raman scattering (SERS) signals. In this way, both information about their localization at the micrometre scale and their molecular nanoenvironment, respectively, is obtained and can be related. Thus, the nanoparticle pathway from endocytotic uptake, intracellular processing, to cell division can be followed. It is shown that the ability of the intracellular nanoparticles and their accumulations and aggregates to support high SERS signals is neither directly related to nanoparticle amount nor to high local nanoparticle densities. The SERS data indicate that aggregate geometry and interparticle distances in the cell must change in the course of endosomal maturation and play a critical role for a specific gold nanoparticle type in order to act as efficient SERS nanoprobe. This finding is supported by TEM images, showing only a minor portion of aggregates that present small interparticle spacing. The SERS spectra obtained after different chase times show a changing composition and/or structure of the biomolecule corona of the gold nanoparticles as a consequence of endosomal processing.
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Affiliation(s)
- Tina Büchner
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
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Nienkemper M, Wilmes B, Pauls A, Yamaguchi S, Ludwig B, Drescher D. Treatment efficiency of mini-implant-borne distalization depending on age and second-molar eruption. J Orofac Orthop 2014; 75:118-32. [PMID: 24577015 DOI: 10.1007/s00056-013-0199-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 07/26/2013] [Indexed: 12/24/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the efficiency of molar distalization depending on age and second-molar eruption using the Beneslider. MATERIALS AND METHODS Treatment of 51 patients (mean age 17.8 ± 9.6 years) was investigated retrospectively by means of pre- and posttreatment cephalograms. Patients were divided into three groups: 14 children with unerupted upper second molars (group 1), 23 adolescents with second molar in place (group 2), and 14 adults (group 3). The distalization forces applied were 2.4 N in group 1 and 5.0 N in groups 2 and 3. Treatment changes were evaluated and examined statistically for significant differences. RESULTS In all patients a Class I molar relationship was achieved. All mini-implants remained stable during treatment. Mean distalization distance as measured by the displacement of the center of resistance was 3.6 ± 1.9 mm (range 1.2-8.5 mm depending on treatment needs). Since no significant tipping was detected, the type of movement can be described as bodily movement. Mean overall distalization speed was 0.6 ± 0.4 mm per month. There were no statistical differences between the groups. CONCLUSION We found the Beneslider to be an effective appliance that enables bodily distalization in adequate treatment time. The higher resistance due to erupted second molars can be compensated by the use of higher forces without significantly reducing distalization speed.
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Affiliation(s)
- M Nienkemper
- Department of Orthodontics, Heinrich-Heine-University, Moorenstr. 5, 40225, Düsseldorf, Germany,
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Drescher D, Guttmann P, Büchner T, Werner S, Laube G, Hornemann A, Tarek B, Schneider G, Kneipp J. Specific biomolecule corona is associated with ring-shaped organization of silver nanoparticles in cells. Nanoscale 2013; 5:9193-9198. [PMID: 23929234 DOI: 10.1039/c3nr02129g] [Citation(s) in RCA: 27] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We correlate the localization of silver nanoparticles inside cells with respect to the cellular architecture with the molecular information in the vicinity of the particle surface by combining nanoscale 3D cryo-soft X-ray tomography (cryo-SXT) with surface-enhanced Raman scattering (SERS). The interaction of the silver nanoparticle surface with small molecules and biopolymers was monitored by SERS in vitro over time in living cells. The spectra indicate a stable, time-independent surface composition of silver nanoparticles, despite the changing environment in the endosomal structure. Cryo-SXT reveals a characteristic ring-shaped organization of the silver nanoparticles in endosomes of different cell types. The ring-like structures inside the endosomes suggest a strong association among silver particles and with membrane structures. The comparison of the data with those obtained with gold nanoparticles suggests that the interactions between the nanoparticles and with the endosomal component are influenced by the molecular composition of the corona.
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Affiliation(s)
- Daniela Drescher
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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15
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Drescher D, Büchner T, McNaughton D, Kneipp J. SERS reveals the specific interaction of silver and gold nanoparticles with hemoglobin and red blood cell components. Phys Chem Chem Phys 2013; 15:5364-73. [PMID: 23426381 DOI: 10.1039/c3cp43883j] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The interaction of nanoparticles with hemoglobin (Hb), a major constituent of red blood cells, is important in nanotoxicity research. We report SERS spectra of Hb using gold and silver nanoparticles at very small nanoparticle : Hb molecule ratios, that is, under conditions relevant for SERS-based nanotoxicity experiments with red blood cells at high sensitivity. We show that the structural information obtained from the experiment is highly dependent on the type of SERS substrate and the conditions under which the interaction of nanoparticles with Hb molecules takes place. In experiments with isolated red blood cells, we demonstrate that the dependence of the spectra on the type of nanoparticle used as the SERS substrate extends to whole red blood cells and red blood cell components. Regarding the applicability of SERS to red blood cells in vivo, evidence is provided that the molecular information contained in the spectra is highly dependent on the material and size of the nanoparticles. The results indicate specific interactions of gold and silver nanoparticles with Hb and the red blood cell membrane, and reflect the hemolytic activity of silver nanoparticles. The results of this study help improve our understanding of the interactions of silver and gold nanoparticles with red blood cells.
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Affiliation(s)
- Daniela Drescher
- Humboldt-Universität zu Berlin, Department of Chemistry, Berlin, Germany
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16
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Hoffmann K, Behnke T, Drescher D, Kneipp J, Resch-Genger U. Near-infrared-emitting nanoparticles for lifetime-based multiplexed analysis and imaging of living cells. ACS Nano 2013; 7:6674-6684. [PMID: 23837453 DOI: 10.1021/nn4029458] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The increase in information content from bioassays and bioimaging requires robust and efficient strategies for the detection of multiple analytes or targets in a single measurement, thereby addressing current health and security concerns. For fluorescence techniques, an attractive alternative to commonly performed spectral or color multiplexing presents lifetime multiplexing and the discrimination between different fluorophores based on their fluorescence decay kinetics. This strategy relies on fluorescent labels with sufficiently different lifetimes that are excitable at the same wavelength and detectable within the same spectral window. Here, we report on lifetime multiplexing and discrimination with a set of nanometer-sized particles loaded with near-infrared emissive organic fluorophores chosen to display very similar absorption and emission spectra, yet different fluorescence decay kinetics in suspension. Furthermore, as a first proof-of-concept, we describe bioimaging studies with 3T3 fibroblasts and J774 macrophages, incubated with mixtures of these reporters employing fluorescence lifetime imaging microscopy. These proof-of-concept measurements underline the potential of fluorescent nanoparticle reporters in fluorescence lifetime multiplexing, barcoding, and imaging for cellular studies, cell-based assays, and molecular imaging.
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Affiliation(s)
- Katrin Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Straße 11, 12489 Berlin, Germany
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17
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Hornemann A, Drescher D, Flemig S, Kneipp J. Intracellular SERS hybrid probes using BSA-reporter conjugates. Anal Bioanal Chem 2013; 405:6209-22. [PMID: 23715676 DOI: 10.1007/s00216-013-7054-3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 05/03/2013] [Accepted: 05/07/2013] [Indexed: 11/30/2022]
Abstract
Surface-enhanced Raman scattering (SERS) hybrid probes are characterized by the typical spectrum of a reporter molecule. In addition, they deliver information from their biological environment. Here, we report SERS hybrid probes generated by conjugating different reporter molecules to bovine serum albumin (BSA) and using gold nanoparticles as plasmonic core. Advantages of the BSA-conjugate hybrid nanoprobes over other SERS nanoprobes are a high biocompatibility, stabilization of the gold nanoparticles in the biological environment, stable reporter signals, and easy preparation. The coupling efficiencies of the BSA-reporter conjugates were determined by MALDI-TOF-MS. The conjugates' characteristic SERS spectra differ from the spectra of unbound reporter molecules. This is a consequence of the covalent coupling, which leads to altered SERS enhancement and changes in the chemical structures of the reporter and of BSA. The application of the BSA-reporter conjugate hybrid probes in 3T3 cells, including duplex imaging, is demonstrated. Hierarchical cluster analysis and principal components analysis were applied for multivariate imaging using the SERS signatures of the incorporated SERS hybrid nanoprobes along with the spectral information from biomolecules in endosomal structures of cells. The results suggest more successful applications of the SERS hybrid probes in cellular imaging and other unordered high-density bioanalytical sensing.
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Affiliation(s)
- Andrea Hornemann
- Department of Chemistry, Humboldt-Universität zu Berlin, Berlin, Germany
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18
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Pauls A, Nienkemper M, Drescher D. Accuracy of torque-limiting devices for mini-implant removal: an in vitro study. J Orofac Orthop 2013; 74:205-16. [DOI: 10.1007/s00056-013-0141-4] [Citation(s) in RCA: 3] [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] [Received: 07/31/2012] [Accepted: 11/02/2012] [Indexed: 11/29/2022]
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19
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Affiliation(s)
- B. Wilmes
- Poliklinik für Kieferorthopädie, Universität Düsseldorf
| | - M. Nienkemper
- Poliklinik für Kieferorthopädie, Universität Düsseldorf
| | - D. Drescher
- Poliklinik für Kieferorthopädie, Universität Düsseldorf
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20
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Drescher D, Giesen C, Traub H, Panne U, Kneipp J, Jakubowski N. Quantitative Imaging of Gold and Silver Nanoparticles in Single Eukaryotic Cells by Laser Ablation ICP-MS. Anal Chem 2012; 84:9684-8. [DOI: 10.1021/ac302639c] [Citation(s) in RCA: 169] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Daniela Drescher
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str.
2, 12489 Berlin, Germany
| | - Charlotte Giesen
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str.
2, 12489 Berlin, Germany
| | - Heike Traub
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
| | - Ulrich Panne
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str.
2, 12489 Berlin, Germany
| | - Janina Kneipp
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str.
2, 12489 Berlin, Germany
| | - Norbert Jakubowski
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Str.
11, 12489 Berlin, Germany
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21
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Nienkemper M, Wilmes B, Pauls A, Drescher D. Multipurpose use of orthodontic mini-implants to achieve different treatment goals. J Orofac Orthop 2012; 73:467-76. [PMID: 23104396 DOI: 10.1007/s00056-012-0107-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Accepted: 06/18/2012] [Indexed: 11/25/2022]
Affiliation(s)
- M Nienkemper
- Policlinic of Orthodontics, University Hospital Düsseldorf, Germany.
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22
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23
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Wilmes B, Drescher D. Impact of bone quality, implant type, and implantation site preparation on insertion torques of mini-implants used for orthodontic anchorage. Int J Oral Maxillofac Surg 2011; 40:697-703. [PMID: 21458232 DOI: 10.1016/j.ijom.2010.08.008] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Revised: 06/23/2010] [Accepted: 08/03/2010] [Indexed: 10/18/2022]
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24
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Drescher D, Gockel I, Helmreich-Becker I, Lang H. [Giant paraesophageal herniation with intermittent prolapse into the thorax of the transverse colon]. Dtsch Med Wochenschr 2011; 136:213-6. [PMID: 21271485 DOI: 10.1055/s-0031-1272513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
HISTORY AND ADMISSION FINDINGS A 74-year-old woman was admitted with a history of recurring dyspnea for several months. During radiological examination of the chest computed tomography demonstrated a giant paraesophageal hernia containing transverse colon with a significant amount of paracolic fat tissue. Physical examination was unremarkable. INVESTIGATIONS Routine blood tests and abdominal ultrasound were within the normal range. Endoscopy showed a normal upper and lower gastrointestinal tract and barium swallow was normal without any esophageal motor dysfunction. The esophagogastric junction and gastric fundus were below the diaphragm. TREATMENT AND COURSE Laparoscopy revealed the colonic herniation and mediastinal adhesiolysis, complete resection of the hernia sac and reposition of the intrathoracic migrated transverse colon were undertaken. Hiatal repair was performed by anterior and posterior hiatoplasty and construction of an anterior 180˚ semifundoplication with fundopexy. CONCLUSION Patients with giant paraesophageal hernias often present with nonspecific cardiac and respiratory symptoms and the condition is often misdiagnosed. If it is demonstrated, a possible abdominal involvement should be looked for. Minimally invasive surgery is feasible and efficacious in this condition and in addition to being better tolerated by the patient provides a far better visualization of the intrathoracic parts of a type IV hiatal hernia to the surgeon.
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Affiliation(s)
- D Drescher
- Klinik und Poliklinik für Allgemein- und Abdominalchirurgie, Universitätsmedizin der Johannes Gutenberg Universität, Mainz.
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25
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Matschulat A, Drescher D, Kneipp J. Surface-enhanced Raman scattering hybrid nanoprobe multiplexing and imaging in biological systems. ACS Nano 2010; 4:3259-69. [PMID: 20503969 DOI: 10.1021/nn100280z] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Surface-enhanced Raman scattering (SERS) labels and probes consisting of gold and silver nanoaggregates and attached reporter molecules can be identified by the Raman signature of the reporter molecule. At the same time, SERS hybrid probes deliver sensitive molecular structural information on their nanoenvironment. Here we demonstrate full exploitation of the multifunctional and multiplexing capabilities inherent to such nanoprobes by applying cluster methods and principal components approaches for discrimination beyond the visual inspection of individual spectra that has been practiced so far. The reported results indicate that fast, multivariate evaluation of whole sets of multiple probes is feasible. Spectra of five different reporters were shown to be separable by hierarchical clustering and by principal components analysis (PCA). In a duplex imaging approach in live cells, hierarchical cluster analysis, K-means clustering, and PCA were used for imaging the positions of different types of SERS probes along with the spectral information from cellular constituents. Parallel to cellular imaging experiments, cytotoxicity of the SERS hybrid probes containing aromatic thiols as reporters is assessed. The reported results suggest multiplexing applications of the nontoxic SERS nanoprobes in high density sensing and imaging in complex biological structures.
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Affiliation(s)
- Andrea Matschulat
- Federal Institute for Materials Research and Testing, Richard-Willstatter-Strasse 11, 12489 Berlin, Germany
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26
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Roth A, Drescher D, Yang Y, Redmer S, Uhlig S, Arenz C. Potente und selektive Inhibition der sauren Sphingomyelinase durch Bisphosphonate. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903288] [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: 11/11/2022]
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27
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Roth A, Drescher D, Yang Y, Redmer S, Uhlig S, Arenz C. Potent and Selective Inhibition of Acid Sphingomyelinase by Bisphosphonates. Angew Chem Int Ed Engl 2009; 48:7560-3. [DOI: 10.1002/anie.200903288] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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28
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Kobe D, Becker U, Bourauel C, Drescher D, Nellen B. Vermessung von Zahnstellungen und kieferorthopädischen Zahnbewegungen und Visualisierung der Daten. BIOMED ENG-BIOMED TE 2009. [DOI: 10.1515/bmte.1995.40.s1.25] [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: 11/15/2022]
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29
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Bourauel C, Drescher D, Nolte LP, Kobe D. Kieferorthopädische Behandlungselemente aus pseudoelastischen Nickel-Titan-Memory-Legierungen - Finite Elemente Modellierung, experimentelle Verifizierung und klinischer Einsatz. BIOMED ENG-BIOMED TE 2009. [DOI: 10.1515/bmte.1995.40.s1.27] [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: 11/15/2022]
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30
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Ferber G, Hinrichs H, Drescher D. Automatische Erkennung gruppierter Muster im EEG. KLIN NEUROPHYSIOL 2008. [DOI: 10.1055/s-2008-1060954] [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: 10/21/2022]
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31
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Fuck LM, Wilmes B, Gürler G, Hönscheid R, Drescher D. Friktionsverhalten selbstligierender und konventioneller Bracketsysteme. Inf Orthod Kieferorthop 2007. [DOI: 10.1055/s-2007-960547] [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: 10/23/2022]
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32
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Hammer F, Drescher D, Subtil S, Allolio B, Arlt W. Sex steroid biosynthesis in human peripheral blood mononuclear cells changes with aging. Exp Clin Endocrinol Diabetes 2004. [DOI: 10.1055/s-2004-819327] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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33
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Bangert M, Altenmüller E, Peschel T, Rotte M, Drescher D, Hinrichs H, Heinze HJ. Piano-training induces audio-sensorymotor coupling in the cerebral cortex: an EEG and fMRI Study. Akt Neurol 2004. [DOI: 10.1055/s-2004-833036] [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: 10/28/2022]
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34
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Hoederath H, Bourauel C, Drescher D. Differences between two transpalatal arch systems upon first-, second-, and third-order bending activation. J Orofac Orthop 2001; 62:58-73. [PMID: 11227207 DOI: 10.1007/pl00001919] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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: 10/25/2022]
Abstract
Transpalatal arches are used in passive mode to improve anchor-age and in activated mode to achieve single tooth movement or movement of segments of teeth in first-, second- and third-order. Clinically it seems that the commonly used palatal arches of the Goshgarian type (here in the MIA system) as well as the precision TMA lingual arches of the Burstone system are not equally suitable for all kinds of activations. Using the Orthodontic Measurement and Simulation System (OMSS) the force systems and the efficacy of activated arches of both systems were examined in an experimental study with respect to different malpositions. The following first-, second- and third-order activations were chosen: symmetrical expansion and compression up to 4 mm, symmetrical distal rotation up to 15 degrees, unilateral distal tipping of 15 degrees and symmetrical buccal root torque up to 10 degrees. Attachments of the MIA system (MIA Rotation Lingual Sheaths, 0.072" x 0.036") and of the Burstone system (precision lingual hinge cap, 0.032" x 0.032", unused and a pair after a 4-week introral application period) were measured. Lingual arches made of 0.036" round stainless steel wire (MIA) and 0.032" x 0.032" TMA (Burstone system) were prepared with a height of 18 mm and a width of 30 mm. First-order activation bends (expansion and compression) of the MIA palatal arches caused forces up to 4.4 N compared to 1.8 N of the TMA arches, due to the lower load/deflection rate of the latter. The malpositions were corrected effectively by both systems. Due to the higher stiffness the moments delivered by the MIA palatal arches (39 Nmm) were higher in distal rotation compared to those of the TMA arches (14 Nmm) and the correction was more effective. In second-order activations (tipping) the MIA system delivered no or only small moments because of the curved shape of the attachments. A correction of only 30% was achieved compared to 80% with the Burstone system. In third-order activations, in contrast, the Burstone attachments caused considerable loss of torque. This was obviously due to the strong deformation of the slot by the intraoral loading. If it were possible to improve the dimensional stability of the hinge cap, all corrections carried out with the Burstone TMA system would involve distinctly smaller forces and moments than the MIA system but would still ensure good effectiveness.
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Affiliation(s)
- H Hoederath
- Department of Orthodontics, University of Bonn,
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35
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Abstract
In arch guided tooth movement, the essential role played by bracket configuration with respect to sliding friction has been recognized by the manufacturers, a fact which has had an increasing impact on the design and marketing of new bracket models in recent years. The aim of the present in-vitro study was to investigate the influence of different bracket designs on sliding mechanics. Five differently shaped stainless steel brackets (Discovery: Dentaurum, Damon SL: A-Company, Synergy: Rocky Mountain Orthodontics, Viazis bracket and Omni Arch appliance: GAC) were compared in the 0.022"-slot system. The Orthodontic Measurement and Simulation System (OMSS) was used to quantify the difference between applied force (NiTi coil spring, 1.0 N) and orthodontically effective force and to determine leveling losses occurring during the sliding process in arch guided tooth movement. Simulated canine retraction was performed using continuous arch wires with the dimensions 0.019" x 0.025" (Standard Steel, Unitek) and 0.020" x 0.020" (Ideal Gold, GAC). Comparison of the brackets revealed friction-induced losses ranging from 20 to 70%, with clear-cut advantages resulting from the newly developed bracket types. However, an increased tendency towards leveling losses in terms of distal rotation (maximum 15 degrees) or buccal root torque (maximum 20 degrees) was recorded, especially with those brackets giving the arch wire increased mobility due to their shaping or lack of ligature wire.
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36
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Freisfeld M, Dahl IA, Jäger A, Drescher D, Schüller H. X-ray diagnosis of impacted upper canines in panoramic radiographs and computed tomographs. J Orofac Orthop 1999; 60:177-84. [PMID: 10394211 DOI: 10.1007/bf01365264] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 10/25/2022]
Abstract
Ten orthodontists were asked to diagnose the number of impacted upper canines and the number of resorbed lateral and/or central incisor roots in 30 panoramic radiographs (P1) from 30 patients. In order to objectify these diagnoses, transversal CT images of all 30 patients were examined in addition. Addition of the recordings in the 30 patients revealed that the 10 orthodontists had diagnosed 350 impacted/displaced canines. On comparison of the P1 and CT results, the latter revealed that, in fact, 390 canines were impacted or displaced, not just 350. Addition of the recordings further showed that, based on P1, the investigators had diagnosed 73 resorptions in the 1,200 incisors examined. However, the CT showed 160 resorptions; this corresponds to a sensitivity value of 45.6%. The CT showed 1,040 incisors with no resorptions, whereas the investigators diagnosed only 925 teeth as not resorbed in the P1. The specificity was thus 88.9%. These results show that, due to their low reliability, panoramic radiographs are not an appropriate means of diagnosing resorptions in front teeth in connection with impacted canines.
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Affiliation(s)
- M Freisfeld
- Poliklinik für Kieferorthopädie, Rheinische Friedrich-Wilhelms-Universität Bonn
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37
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Abstract
With the increasing number of orthodontic treatments using devices containing nickel and the growing prevalence of nickel allergy in the average population, biocompatibility studies of these devices have become a topic of major interest. The corrosion behavior of orthodontic wires is a decisive factor determining their biocompatibility. Therefore four nickel-titanium guiding arches, a titanium-molybdenum and a stainless steel wire were analyzed for corrosion behavior under realistic conditions. Pure potentiostatic, pure mechanical and combined potentiostatic and mechanical stresses were applied to the specimens. Subsequently, the surfaces of the wires were investigated employing atomic force microscopy (AFM) and nickel loss was measured with an atomic absorption spectrophotometer. The results yield information about the relative corrosion tendency of the wires under in vitro conditions. The wires examined can be classified into two groups, one with a high and a second group with a low tendency towards corrosion, that is American Orthodontics Memory wire as well as GAC Neo Sentalloy and Ormco Ni-Ti as well as Unitek Nitinol respectively. Although corrosion behavior under clinical conditions can not be directly derived from these results, analyses of wires after clinical usage indicate that changes of wire surfaces might show the same characteristics under in vitro conditions.
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Affiliation(s)
- F Widu
- Department of Orthodontics, Heinrich-Heine-Universität, Düsseldorf, Germany
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38
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Bourauel C, Freudenreich D, Vollmer D, Kobe D, Drescher D, Jäger A. Simulation of orthodontic tooth movements. A comparison of numerical models. J Orofac Orthop 1999; 60:136-51. [PMID: 10220981 DOI: 10.1007/bf01298963] [Citation(s) in RCA: 85] [Impact Index Per Article: 3.4] [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: 10/25/2022]
Abstract
Orthodontic tooth movements are based on the ability of bone to react to mechanical stresses with the apposition and resorption of alveolar bone. Currently, the underlying biophysical, biochemical, and cellular processes are the subject of numerous studies. At present, however, an analytical description of orthodontic tooth movements including all components of the processes involved seems to be impossible. It was the aim of the present study to develop a mechanics-based phenomenological model capable of describing the alveolar bone remodeling. Thus, 2 different models were developed. The first is based on the assumption that deformations of the periodontal ligament (PDL) are the key stimulus to starting orthodontic tooth movement. The second supposes that deformations of the alveolar bone are the basis of orthodontic bone remodeling. Both models were integrated into a finite element package calculating stresses, strains and deformations of tooth and tooth supporting structures and from this simulating the movement of the tooth and its alveolus through the bone. Clinically induced canine retractions in 5 patients as well as force systems were exactly measured and the tooth movements were simulated using both models. The results show that the first model allows reliable simulation of orthodontic tooth movements, whereas the second is to be rejected.
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Affiliation(s)
- C Bourauel
- Poliklinik für Kieferorthopädie, Rheinische Friedrich Wilhelms-Universität Bonn, Germany.
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39
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Köhn FM, Müller C, Drescher D, Neukamm C, el Mulla KF, Henkel R, Hägele W, Hinsch E, Habenicht UF, Schill WB. Effect of angiotensin converting enzyme (ACE) and angiotensins on human sperm functions. Andrologia 1998; 30:207-15. [PMID: 9739417 DOI: 10.1111/j.1439-0272.1998.tb01162.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [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: 11/28/2022] Open
Abstract
The presence of components of the renin angiotensin system (RAS) and specific receptors of angiotensin II in the female and male reproductive tract supports the hypothesis that reproductive functions may be controlled by RAS. Therefore, the present study investigated the influence of ACE and angiotensins on sperm functions and the sperm-egg interaction. The experiments did not indicate direct effects of ACE on the capacitation process or acrosome reaction. Release of ACE from human spermatozoa during capacitation was not related to their ability to undergo acrosome reaction after stimulation with ionophore. Therefore, ACE release does not seem to be a useful clinical marker for human sperm capacitation. However, decreased binding of human spermatozoa to the oolemma of zonafree hamster oocytes after inhibition of ACE by captopril indicates that kininase II is involved in sperm-egg interactions. In contrast to other studies, incubation with captopril had no influence on sperm binding to the zona pellucida. Because effects of ACE on sperm-egg interactions but not on capacitation or acrosome reaction were observed, several experiments were performed to study the influence of substrates and products on the acrosome reaction. Angiotensin II induced the acrosome reaction dose-dependently, whereas angiotensin I had no effect on the acrosome reaction. The effect of angiotensin II on acrosome reaction seems to be calcium-dependent and mediated by protein kinases. Since a specific type 2 angiotensin II receptor inhibits the acrosome reaction induced by angiotensin II, this subtype of receptors may be present at the surface of sperm heads. Another clue for the presence of type 2 receptors on human spermatozoa is the finding that pertussis toxin did not inhibit the angiotensin II induced acrosome reaction. In contrast to type 1 angiotensin II receptors, type 2 receptors are known to be G-protein independent.
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Affiliation(s)
- F M Köhn
- Center of Dermatology and Andrology, Justus Liebig University, Giessen, Germany
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40
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Abstract
In orthodontic treatment employing arch guided tooth movement, rectangular wires are usually used to achieve three-dimensional controlled tooth movement. In the intention to optimize sliding mechanics and to improve the comfort of patients, edge beveled rectangular orthodontic wires are offered by different manufacturers. The objective of the study presented was to investigate the influence of differing but defined wire roundings on sliding mechanics of canine retraction. Employing the 0.018" slot system, 0.016" x 0.022" standard steel wires (Remaloy and Remanium, Dentaurum Comp.) were tested. Force loss due to friction during canine retraction was determined using the Orthodontic Measurement and Simulation System (OMSS). In the arch guided distalization of canines, the average loss of force caused by friction was determined to be approximately 50%. Comparing wires with different edge bevel, the rounded wire in contrast to the wire with sharpest edge configuration results in a reduction of friction. Even a moderate wire rounding of the 0.016" x 0.022" steel wire results in about 10% reduction in frictional losses. However, dynamic analysis of tooth movement with the OMSS shows that there is no further improvement of sliding mechanics using wires with edge bevel exceeding the standard rounding of rectangular wires. In contrast, a strong edge bevel may result in a considerable loss of leveling.
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Kobe D, Bourauel C, Freudenreich D, Nellen B, Drescher D. [Computer-assisted orthodontic treatment planning and analysis of treatment situations]. BIOMED ENG-BIOMED TE 1998; 42 Suppl:417-8. [PMID: 9517217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- D Kobe
- Poliklinik für Kieferorthopädie der Universität Bonn
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42
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Freudenreich D, Bourauel C, Kobe D, Drescher D, Nellen B. [Model developments for calculating force systems for orthodontic treatment elements]. BIOMED ENG-BIOMED TE 1998; 42 Suppl:464-5. [PMID: 9517239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Bourauel C, Kobe D, Vollmer D, Drescher D. [Numerical simulation of orthodontic tooth movements using the finite element method (FEM)]. BIOMED ENG-BIOMED TE 1998; 42 Suppl:339-40. [PMID: 9517181 DOI: 10.1515/bmte.1997.42.s2.339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- C Bourauel
- Poliklinik für Kieferorthopädie, Universität Bonn
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Affiliation(s)
- D Vollmer
- Poliklinik für Kieferorthopädie, Universität Bonn
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Freisfeld M, Drescher D, Kobe D, Schüller H. Assessment of the space for the lower wisdom teeth. Panoramic radiography in comparison with computed tomography. J Orofac Orthop 1998; 59:17-28. [PMID: 9505052 DOI: 10.1007/bf01321552] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 02/06/2023]
Abstract
From 13 patients a computed tomograph (CT-scan) and a panoramic radiograph (Orthophos, program 1, P1) were examined with respect to the spatial conditions of the lower wisdom teeth. In the panoramic radiograph the available space for the third molars of the lower jaw was determined by calculating the ratio (Q) of 2 distances: the mesiodistal crown diameter and the retromolar space. In the axial CT 3 different positions of the third molar were distinguished: third molar located anterior to the ramus mandibulae = sufficient space, partially within the ramus = restricted space, totally within the ramus = deficient space. These positions were compared with the findings in the panoramic radiograph, firstly in relation to the ramus and secondly in relation to a line (L) perpendicular to the occlusal plane at the intersection of the anterior border of the ramus and the crista temporalis. Furthermore, the mesial rotation of the third molar was measured and the relation of the bony structures surrounding the teeth were described. Comparison of the CT results with the quotients of the P1 showed that, for those wisdom teeth molars with an available space above 50% to under 100%, any of the 3 CT gradings was found. Assessing the projection of the ramus over the third molar as seen in the P1, 60% of the P1- and CT-results corresponded. The relation between the line L and the third molar showed coincidence in 76% of all cases. These results and the mesial rotation of the wisdom teeth as well as their different relation to the bony environment are possibly important factors concerning their eruption prognosis. The three-dimensional CT-scan gives new possibilities for further investigations of third-molar problems.
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Affiliation(s)
- M Freisfeld
- Department of Orthodontics, University of Bonn, Germany
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46
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Bourauel C, Fries T, Drescher D, Plietsch R. Surface roughness of orthodontic wires via atomic force microscopy, laser specular reflectance, and profilometry. Eur J Orthod 1998; 20:79-92. [PMID: 9558768 DOI: 10.1093/ejo/20.1.79] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.5] [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: 02/07/2023]
Abstract
The surface roughness of orthodontic archwires is an essential factor that determines the effectiveness of arch-guided tooth movement. Using the non-destructive techniques of atomic force microscopy (AFM) and of laser specular reflectance, the surface roughness of 11 nickel-titanium orthodontic wires, a stainless steel and a beta-titanium wire was measured. The results were compared with those obtained using surface profilometry. The smoothest wire, stainless steel, had an optical roughness of 0.10 micron, compared with 0.09 micron from AFM and 0.06 from profilometry. The surface roughness for the beta-titanium wire measured by all three methods was approximately 0.21 micron, while that of the NiTi wires ranged from 0.10 to 1.30 microns. As the surface roughness not only affects the effectiveness of sliding mechanics, but also the corrosion behaviour and the aesthetics of orthodontic components, the manufacturers of orthodontic wires should make an effort to improve the surface quality of their products.
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Affiliation(s)
- C Bourauel
- Department of Orthodontics, University of Bonn, Germany
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47
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Abstract
An optomechanical set-up was developed to accurately measure displacement/force curves of the initial tooth mobility in vitro. The system presented is capable of recording all six components of a tooth movement resulting from an applied orthodontic force system, and consists of a laser diode-based optical part and a six degree of freedom mechanical part. Three laser diodes were mounted in orthogonal arrangement on the tooth of a specimen and their light (lambda = 670 nm) was focused on the surfaces of three position sensing detectors. The laser beams thus defined a cartesian rigid body coordinate system and the movements of the tooth could directly be derived from the movements of the laser spots on the surfaces of the optical detectors. The force system was applied and simultaneously measured via a three-dimensional force-torque transducer mounted on a six-axis positioning table. Measuring accuracy of the tooth displacements was in the range of 9.0 microns and 0.022 deg for translations and rotations, respectively. Resolution and accuracy of the mechanical system was approx. 0.02 N for the measurement of forces and 0.5 Nmm for torques. Displacement/force diagrams of the specimen of a swine's mandible are presented, showing the relationships between applied force system and tooth displacement of the lower first premolar. The accuracy reached proved to be sufficient for the verification of numerical (Finite Element) models of the initial tooth mobility.
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Affiliation(s)
- M Hinterkausen
- Poliklinik für Kieferorthopädie, Universität Bonn, Germany
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48
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Bourauel C, Drescher D, Ebling J, Broome D, Kanarachos A. Superelastic nickel titanium alloy retraction springs--an experimental investigation of force systems. Eur J Orthod 1997; 19:491-500. [PMID: 9386335 DOI: 10.1093/ejo/19.5.491] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 02/05/2023]
Abstract
The purpose of the present investigation was to study the mechanical characteristics of canine retraction springs made of superelastic nickel titanium (NiTi) alloys. A modified Burstone T-loop was used to construct an experimental canine retraction spring 10 mm in height and 10 mm in length. Twenty-five NiTi T-segments were hand made from the superelastic orthodontic alloys Ormco NiTi and Soar Sentalloy (dimensions 0.016 x 0.022"). The T-segments were equipped with arms made of rectangular standard steel wire (0.017 x 0.025"). The following geometrical and mechanical parameters of the retraction springs were analysed: radius and bending angles of the T-segments, distalizing force and M/F ratio during activation and the force/deflection rate of the springs. The error in the geometric parameters was in the range of 5-10 per cent, irrespective of the alloy used to produce the T-segments. On the other hand, the force systems of the springs were strongly influenced by the alloy and the batch under investigation. There were differences in the distalizing force of up to 100 per cent, i.e. at the beginning of the unloading plateau the distalizing force varied from 0.4 to 2.5 N. The force/deflection rate varied between a value of 0.06 and 0.15 N/mm, whereas the moment/force ratio reached values of 6.5-7.0 mm. Within a single batch, a reproducibility of these mechanical properties of approximately 5 per cent could be obtained. These results confirm that each orthodontic device made of superelastic NiTi alloys has to be calibrated individually. The manufacturers should pay more attention to keeping the material properties of their NiTi alloys constant.
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Affiliation(s)
- C Bourauel
- Department of Orthodontics, University of Bonn, Germany
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49
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Kobe D, Bourauel C, Freudenreich D, Nellen B, Drescher D. Computergestützte kieferorthopädische Behandlungsplanung und Analyse von Behandlungssituationen. BIOMED ENG-BIOMED TE 1997. [DOI: 10.1515/bmte.1997.42.s2.417] [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: 11/15/2022]
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50
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Freudenreich D, Bourauel C, Kobe D, Drescher D, Nellen B. Modellentwicklungen für die Berechnung von Kraftsystemen kieferorthopädischer Behandlungselemente. BIOMED ENG-BIOMED TE 1997. [DOI: 10.1515/bmte.1997.42.s2.464] [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: 11/15/2022]
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