1
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Kocabey S, Chiarelli G, Acuna GP, Ruegg C. Ultrasensitive and multiplexed miRNA detection system with DNA-PAINT. Biosens Bioelectron 2023; 224:115053. [PMID: 36608362 DOI: 10.1016/j.bios.2022.115053] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022]
Abstract
MiRNAs hold great potential as biomarkers for the early detection and monitoring of diseases based on their differential expression profiles. Therefore, the sensitive, specific and accurate detection of miRNAs represents an emerging new tool to improve diagnosis and treatment of several diseases, cancer in particular. DNA origami-based miRNA detection is particularly advantageous as it allows to incorporate multiple attachment sites to capture different target miRNAs at the nanoscale. In this work, we present a DNA origami nanoarray system providing distance-dependent recognition of miRNAs by applying super-resolution microscopy technique; DNA-PAINT (point accumulation for imaging in nanoscale topography). The sensor can detect up to 4 miRNAs either separately or in combination based on the relative distance to the boundary markers on the structure using a single imager strand. The detection is highly sensitive, with a limit of detection down to the low femtomolar range (11 fM - 388 fM) and has a large dynamic range up to 10 nM without need for amplification. Moreover, our detection system can discriminate single base mismatches with low false positive rates. Using our strategy, we demonstrate the detection of endogenous miRNAs from cell extracts of cancer cell lines and plasma from breast cancer patients. Overall, we developed an ultrasensitive and amplification-free, DNA-PAINT imaging-based miRNA detection method using DNA origami nanoarray system for the detection of breast-cancer associated miRNAs which potentially provides a sensitive and accurate alternative to the current multiplexed diagnostic technologies.
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Affiliation(s)
- Samet Kocabey
- Laboratory of Experimental and Translational Oncology, Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700, Fribourg, Switzerland.
| | - Germán Chiarelli
- Photonic Nanosystems, Department of Physics, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 3, PER08, 1700, Fribourg, Switzerland
| | - Guillermo P Acuna
- Photonic Nanosystems, Department of Physics, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 3, PER08, 1700, Fribourg, Switzerland
| | - Curzio Ruegg
- Laboratory of Experimental and Translational Oncology, Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700, Fribourg, Switzerland
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2
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Domljanovic I, Loretan M, Kempter S, Acuna GP, Kocabey S, Ruegg C. DNA origami book biosensor for multiplex detection of cancer-associated nucleic acids. Nanoscale 2022; 14:15432-15441. [PMID: 36219167 PMCID: PMC9612396 DOI: 10.1039/d2nr03985k] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 09/03/2022] [Indexed: 06/16/2023]
Abstract
DNA nanotechnology provides a promising approach for the development of biomedical point-of-care diagnostic nanoscale devices that are easy to use and cost-effective, highly sensitive and thus constitute an alternative to expensive, complex diagnostic devices. Moreover, DNA nanotechnology-based devices are particularly advantageous for applications in oncology, owing to being ideally suited for the detection of cancer-associated nucleic acids, including circulating tumor-derived DNA fragments (ctDNAs), circulating microRNAs (miRNAs) and other RNA species. Here, we present a dynamic DNA origami book biosensor that is precisely decorated with arrays of fluorophores acting as donors and acceptors and also fluorescence quenchers that produce a strong optical readout upon exposure to external stimuli for the single or dual detection of target oligonucleotides and miRNAs. This biosensor allowed the detection of target molecules either through the decrease of Förster resonance energy transfer (FRET) or an increase in the fluorescence intensity profile owing to a rotation of the constituent top layer of the structure. Single-DNA origami experiments showed that detection of two targets can be achieved simultaneously within 10 min with a limit of detection in the range of 1-10 pM. Overall, our DNA origami book biosensor design showed sensitive and specific detection of synthetic target oligonucleotides and natural miRNAs extracted from cancer cells. Based on these results, we foresee that our DNA origami biosensor may be developed into a cost-effective point-of-care diagnostic strategy for the specific and sensitive detection of a variety of DNAs and RNAs, such as ctDNAs, miRNAs, mRNAs, and viral DNA/RNAs in human samples.
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Affiliation(s)
- Ivana Domljanovic
- Laboratory of Experimental and Translational Oncology, Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700 Fribourg, Switzerland.
| | - Morgane Loretan
- Photonic Nanosystems, Department of Physics, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 3, PER08, 1700 Fribourg, Switzerland.
| | - Susanne Kempter
- Department of Physics, Ludwig-Maximilians-University, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
| | - Guillermo P Acuna
- Photonic Nanosystems, Department of Physics, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 3, PER08, 1700 Fribourg, Switzerland.
| | - Samet Kocabey
- Laboratory of Experimental and Translational Oncology, Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700 Fribourg, Switzerland.
| | - Curzio Ruegg
- Laboratory of Experimental and Translational Oncology, Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700 Fribourg, Switzerland.
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3
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Kocabey S, Ekim Kocabey A, Schneiter R, Rüegg C. Membrane-Interacting DNA Nanotubes Induce Cancer Cell Death. Nanomaterials (Basel) 2021; 11:nano11082003. [PMID: 34443832 PMCID: PMC8397952 DOI: 10.3390/nano11082003] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/25/2021] [Accepted: 07/30/2021] [Indexed: 12/31/2022]
Abstract
DNA nanotechnology offers to build nanoscale structures with defined chemistries to precisely position biomolecules or drugs for selective cell targeting and drug delivery. Owing to the negatively charged nature of DNA, for delivery purposes, DNA is frequently conjugated with hydrophobic moieties, positively charged polymers/peptides and cell surface receptor-recognizing molecules or antibodies. Here, we designed and assembled cholesterol-modified DNA nanotubes to interact with cancer cells and conjugated them with cytochrome c to induce cancer cell apoptosis. By flow cytometry and confocal microscopy, we observed that DNA nanotubes efficiently bound to the plasma membrane as a function of the number of conjugated cholesterol moieties. The complex was taken up by the cells and localized to the endosomal compartment. Cholesterol-modified DNA nanotubes, but not unmodified ones, increased membrane permeability, caspase activation and cell death. Irreversible inhibition of caspase activity with a caspase inhibitor, however, only partially prevented cell death. Cytochrome c-conjugated DNA nanotubes were also efficiently taken up but did not increase the rate of cell death. These results demonstrate that cholesterol-modified DNA nanotubes induce cancer cell death associated with increased cell membrane permeability and are only partially dependent on caspase activity, consistent with a combined form of apoptotic and necrotic cell death. DNA nanotubes may be further developed as primary cytotoxic agents, or drug delivery vehicles, through cholesterol-mediated cellular membrane interactions and uptake.
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Affiliation(s)
- Samet Kocabey
- Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700 Fribourg, Switzerland
- Correspondence: (S.K.); (C.R.)
| | - Aslihan Ekim Kocabey
- Department of Biology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 10, PER05, 1700 Fribourg, Switzerland; (A.E.K.); (R.S.)
| | - Roger Schneiter
- Department of Biology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 10, PER05, 1700 Fribourg, Switzerland; (A.E.K.); (R.S.)
| | - Curzio Rüegg
- Department of Oncology, Microbiology and Immunology, Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700 Fribourg, Switzerland
- Correspondence: (S.K.); (C.R.)
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4
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Rafiee SD, Kocabey S, Mayer M, List J, Rüegg C. Front Cover: Detection of HER2
+
Breast Cancer Cells using Bioinspired DNA‐Based Signal Amplification (ChemMedChem 8/2020). ChemMedChem 2020. [DOI: 10.1002/cmdc.202000181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sarah D. Rafiee
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine University of Fribourg Chemin du Musée 18, PER17 1700 Fribourg Switzerland
| | - Samet Kocabey
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine University of Fribourg Chemin du Musée 18, PER17 1700 Fribourg Switzerland
| | - Michael Mayer
- BioPhysics, Adolphe Merkle Institute University of Fribourg Chemin des Verdiers 4, PER 18 1700 Fribourg Switzerland
| | - Jonathan List
- BioPhysics, Adolphe Merkle Institute University of Fribourg Chemin des Verdiers 4, PER 18 1700 Fribourg Switzerland
- Physics of Synthetic Biological Systems Technical University Munich Am Coulombwall 4a 85748 Garching Germany
| | - Curzio Rüegg
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine University of Fribourg Chemin du Musée 18, PER17 1700 Fribourg Switzerland
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5
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Rafiee SD, Kocabey S, Mayer M, List J, Rüegg C. Detection of HER2 + Breast Cancer Cells using Bioinspired DNA-Based Signal Amplification. ChemMedChem 2020; 15:661-666. [PMID: 31943804 PMCID: PMC7187270 DOI: 10.1002/cmdc.201900697] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 12/17/2019] [Indexed: 01/25/2023]
Abstract
Circulating tumor cells (CTC) are promising biomarkers for metastatic cancer detection and monitoring progression. However, detection of CTCs remains challenging due to their low frequency and heterogeneity. Herein, we report a bioinspired approach to detect individual cancer cells, based on a signal amplification cascade using a programmable DNA hybridization chain reaction (HCR) circuit. We applied this approach to detect HER2+ cancer cells using the anti‐HER2 antibody (trastuzumab) coupled to initiator DNA eliciting a HCR cascade that leads to a fluorescent signal at the cell surface. At 4 °C, this HCR detection scheme resulted in highly efficient, specific and sensitive signal amplification of the DNA hairpins specifically on the membrane of the HER2+ cells in a background of HER2− cells and peripheral blood leukocytes, which remained almost non‐fluorescent. The results indicate that this system offers a new strategy that may be further developed toward an in vitro diagnostic platform for the sensitive and efficient detection of CTC.
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Affiliation(s)
- Sarah D Rafiee
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700, Fribourg, Switzerland
| | - Samet Kocabey
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700, Fribourg, Switzerland
| | - Michael Mayer
- BioPhysics, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, PER 18, 1700, Fribourg, Switzerland
| | - Jonathan List
- BioPhysics, Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, PER 18, 1700, Fribourg, Switzerland.,Physics of Synthetic Biological Systems, Technical University Munich, Am Coulombwall 4a, 85748, Garching, Germany
| | - Curzio Rüegg
- Department of Oncology, Microbiology and Immunology Faculty of Science and Medicine, University of Fribourg, Chemin du Musée 18, PER17, 1700, Fribourg, Switzerland
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6
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Appel M, Scholz CJ, Kocabey S, Savage S, König C, Yarali A. Independent natural genetic variation of punishment- versus relief-memory. Biol Lett 2017; 12:rsbl.2016.0657. [PMID: 28003518 PMCID: PMC5206585 DOI: 10.1098/rsbl.2016.0657] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 11/29/2016] [Indexed: 11/12/2022] Open
Abstract
A painful event establishes two opponent memories: cues that are associated with pain onset are remembered negatively, whereas cues that coincide with the relief at pain offset acquire positive valence. Such punishment- versus relief-memories are conserved across species, including humans, and the balance between them is critical for adaptive behaviour with respect to pain and trauma. In the fruit fly, Drosophila melanogaster as a study case, we found that both punishment- and relief-memories display natural variation across wild-derived inbred strains, but they do not covary, suggesting a considerable level of dissociation in their genetic effectors. This provokes the question whether there may be heritable inter-individual differences in the balance between these opponent memories in man, with potential psycho-clinical implications.
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Affiliation(s)
- Mirjam Appel
- Research Group Molecular Systems Biology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany.,Max Planck Institute of Neurobiology, Martinsried, Germany
| | - Claus-Jürgen Scholz
- Department of Genomics and Immunoregulation, LIMES Institute, University of Bonn, Bonn, Germany.,Laboratory for Microarray Applications, IZKF, University of Würzburg, Würzburg, Germany
| | - Samet Kocabey
- Max Planck Institute of Neurobiology, Martinsried, Germany
| | - Sinead Savage
- Max Planck Institute of Neurobiology, Martinsried, Germany
| | - Christian König
- Research Group Molecular Systems Biology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany
| | - Ayse Yarali
- Research Group Molecular Systems Biology of Learning, Leibniz Institute for Neurobiology, Magdeburg, Germany .,Max Planck Institute of Neurobiology, Martinsried, Germany.,Center for Behavioral Brain Sciences, Magdeburg, Germany
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7
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Sellner S, Kocabey S, Zhang T, Nekolla K, Hutten S, Krombach F, Liedl T, Rehberg M. Dexamethasone-conjugated DNA nanotubes as anti-inflammatory agents in vivo. Biomaterials 2017; 134:78-90. [DOI: 10.1016/j.biomaterials.2017.04.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 04/12/2017] [Accepted: 04/15/2017] [Indexed: 12/24/2022]
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8
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Sellner S, Kocabey S, Nekolla K, Krombach F, Liedl T, Rehberg M. DNA nanotubes as intracellular delivery vehicles in vivo. Biomaterials 2015; 53:453-63. [DOI: 10.1016/j.biomaterials.2015.02.099] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Revised: 02/19/2015] [Accepted: 02/21/2015] [Indexed: 12/31/2022]
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9
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Göpfrich K, Zettl T, Meijering AEC, Hernández-Ainsa S, Kocabey S, Liedl T, Keyser UF. DNA-Tile Structures Induce Ionic Currents through Lipid Membranes. Nano Lett 2015; 15:3134-8. [PMID: 25816075 DOI: 10.1021/acs.nanolett.5b00189] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Self-assembled DNA nanostructures have been used to create man-made transmembrane channels in lipid bilayers. Here, we present a DNA-tile structure with a nominal subnanometer channel and cholesterol-tags for membrane anchoring. With an outer diameter of 5 nm and a molecular weight of 45 kDa, the dimensions of our synthetic nanostructure are comparable to biological ion channels. Because of its simple design, the structure self-assembles within a minute, making its creation scalable for applications in biology. Ionic current recordings demonstrate that the tile structures enable ion conduction through lipid bilayers and show gating and voltage-switching behavior. By demonstrating the design of DNA-based membrane channels with openings much smaller than that of the archetypical six-helix bundle, our work showcases their versatility inspired by the rich diversity of natural membrane components.
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Affiliation(s)
- Kerstin Göpfrich
- †Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | - Thomas Zettl
- †Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
- ‡Center for NanoScience and Department of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
| | - Anna E C Meijering
- †Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
| | | | - Samet Kocabey
- ‡Center for NanoScience and Department of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
| | - Tim Liedl
- ‡Center for NanoScience and Department of Physics, Ludwig-Maximilians-Universität München, 80539 München, Germany
| | - Ulrich F Keyser
- †Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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10
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Abstract
Biological membranes fulfill many important tasks within living organisms. In addition to separating cellular volumes, membranes confine the space available to membrane-associated proteins to two dimensions (2D), which greatly increases their probability to interact with each other and assemble into multiprotein complexes. We here employed two DNA origami structures functionalized with cholesterol moieties as membrane anchors--a three-layered rectangular block and a Y-shaped DNA structure--to mimic membrane-assisted assembly into hierarchical superstructures on supported lipid bilayers and small unilamellar vesicles. As designed, the DNA constructs adhered to the lipid bilayers mediated by the cholesterol anchors and diffused freely in 2D with diffusion coefficients depending on their size and number of cholesterol modifications. Different sets of multimerization oligonucleotides added to bilayer-bound origami block structures induced the growth of either linear polymers or two-dimensional lattices on the membrane. Y-shaped DNA origami structures associated into triskelion homotrimers and further assembled into weakly ordered arrays of hexagons and pentagons, which resembled the geometry of clathrin-coated pits. Our results demonstrate the potential to realize artificial self-assembling systems that mimic the hierarchical formation of polyhedral lattices on cytoplasmic membranes.
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Affiliation(s)
- Samet Kocabey
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
| | - Susanne Kempter
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
| | - Jonathan List
- ‡Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany
| | - Yongzheng Xing
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
| | - Wooli Bae
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
| | - Daniel Schiffels
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
| | | | - Friedrich C Simmel
- ‡Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany
| | - Tim Liedl
- †Fakultät für Physik and Center for Nanoscience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
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Ceylan H, Kocabey S, Unal Gulsuner H, Balcik OS, Guler MO, Tekinay AB. Bone-Like Mineral Nucleating Peptide Nanofibers Induce Differentiation of Human Mesenchymal Stem Cells into Mature Osteoblasts. Biomacromolecules 2014; 15:2407-18. [DOI: 10.1021/bm500248r] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Hakan Ceylan
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara, 06800, Turkey
| | - Samet Kocabey
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara, 06800, Turkey
| | - Hilal Unal Gulsuner
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara, 06800, Turkey
| | - Ozlem S. Balcik
- Department
of Hematology, School of Medicine Hospital, Turgut Ozal University, Ankara, 06510, Turkey
| | - Mustafa O. Guler
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara, 06800, Turkey
| | - Ayse B. Tekinay
- Institute
of Materials Science and Nanotechnology, National Nanotechnology Research
Center (UNAM), Bilkent University, Ankara, 06800, Turkey
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12
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Kocabey S, Ceylan H, Tekinay AB, Guler MO. Glycosaminoglycan mimetic peptide nanofibers promote mineralization by osteogenic cells. Acta Biomater 2013; 9:9075-85. [PMID: 23871942 DOI: 10.1016/j.actbio.2013.07.007] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Revised: 06/18/2013] [Accepted: 07/08/2013] [Indexed: 10/26/2022]
Abstract
Bone tissue regeneration is accomplished by concerted regulation of protein-based extracellular matrix components, glycosaminoglycans (GAGs) and inductive growth factors. GAGs constitute a significant portion of the extracellular matrix and have a significant impact on regulating cellular behavior, either directly or through encapsulation and presentation of growth factors to the cells. In this study we utilized a supramolecular peptide nanofiber system that can emulate both the nanofibrous architecture of collagenous extracellular matrix and the major chemical composition found on GAGs. GAGs and collagen mimetic peptide nanofibers were designed and synthesized with sulfonate and carboxylate groups on the peptide scaffold. The GAG mimetic peptide nanofibers interact with bone morphogenetic protein-2 (BMP-2), which is a critical growth factor for osteogenic activity. The GAG mimicking ability of the peptide nanofibers and their interaction with BMP-2 promoted osteogenic activity and mineralization by osteoblastic cells. Alkaline phosphatase activity, Alizarin red staining and energy dispersive X-ray analysis spectroscopy indicated the efficacy of the peptide nanofibers in inducing mineralization. The multifunctional and bioactive microenvironment presented here provides osteoblastic cells with osteogenic stimuli similar to those observed in native bone tissue.
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13
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Ustun S, Kocabey S, Guler MO, Tekinay AB. Peptide nanofiber scaffolds for multipotent stromal cell culturing. Methods Mol Biol 2013; 1058:61-76. [PMID: 23526440 DOI: 10.1007/7651_2012_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Self-assembled peptide nanofibers are versatile materials providing suitable platforms for regenerative medicine applications. This chapter describes the use of peptide nanofibers as extracellular matrix mimetic scaffolds for two-dimensional (2D) and three-dimensional (3D) multipotent stromal cell culture systems and procedures for in vitro experiments using these scaffolds. Preparation of 2D and 3D peptide nanofiber scaffolds and cell culturing procedures are presented as part of in vitro experiments including cell adhesion, viability, and spreading analysis. Analysis of cellular differentiation on peptide nanofiber scaffolds is described through immunocytochemistry, qRT-PCR, and other biochemical experiments towards osteogenic and chondrogenic lineage.
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Affiliation(s)
- Seher Ustun
- UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey
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