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Abstract
This chapter focuses on the selection of RNA aptamers, which bind to specific cell surface components and thus can be internalized receptor mediated. Such aptamers discriminate between different tissues, e.g., detect malignant cells, and target them or induce apoptosis through drug internalization. However, before starting the selection process the choice of an ideal target can be challenging. To give an example for the selection of cell specific aptamers, we here used the interleukin-6 receptor (IL-6R) as a target, which is presented on hepatocytes, neutrophils, monocytes, and macrophages.
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Affiliation(s)
- Katharina Berg
- Chemistry Department, Institute for Biochemistry and Molecular Biology, MIN-Faculty, Hamburg University, Martin-Luther-King-Platz 6, 22391, Hamburg, Germany
| | - Eileen Magbanua
- Chemistry Department, Institute for Biochemistry and Molecular Biology, MIN-Faculty, Hamburg University, Martin-Luther-King-Platz 6, 22391, Hamburg, Germany
| | - Ulrich Hahn
- Chemistry Department, Institute for Biochemistry and Molecular Biology, MIN-Faculty, Hamburg University, Martin-Luther-King-Platz 6, 22391, Hamburg, Germany.
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Szameit K, Berg K, Kruspe S, Valentini E, Magbanua E, Kwiatkowski M, Chauvot de Beauchêne I, Krichel B, Schamoni K, Uetrecht C, Svergun DI, Schlüter H, Zacharias M, Hahn U. Structure and target interaction of a G-quadruplex RNA-aptamer. RNA Biol 2016; 13:973-987. [PMID: 27471797 DOI: 10.1080/15476286.2016.1212151] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
G-quadruplexes have recently moved into focus of research in nucleic acids, thereby evolving in scientific significance from exceptional secondary structure motifs to complex modulators of gene regulation. Aptamers (nucleic acid based ligands with recognition properties for a specific target) that form Gquadruplexes may have particular potential for therapeutic applications as they combine the characteristics of specific targeting and Gquadruplex mediated stability and regulation. We have investigated the structure and target interaction properties of one such aptamer: AIR-3 and its truncated form AIR-3A. These RNA aptamers are specific for human interleukin-6 receptor (hIL-6R), a key player in inflammatory diseases and cancer, and have recently been exploited for in vitro drug delivery studies. With the aim to resolve the RNA structure, global shape, RNA:protein interaction site and binding stoichiometry, we now investigated AIR-3 and AIR-3A by different methods including RNA structure probing, Small Angle X-ray scattering and microscale thermophoresis. Our findings suggest a broader spectrum of folding species than assumed so far and remarkable tolerance toward different modifications. Mass spectrometry based binding site analysis, supported by molecular modeling and docking studies propose a general Gquadruplex affinity for the target molecule hIL-6R.
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Affiliation(s)
- Kristina Szameit
- a Institute for Biochemistry and Molecular Biology, Department of Chemistry , University of Hamburg , Hamburg , Germany
| | - Katharina Berg
- a Institute for Biochemistry and Molecular Biology, Department of Chemistry , University of Hamburg , Hamburg , Germany
| | - Sven Kruspe
- a Institute for Biochemistry and Molecular Biology, Department of Chemistry , University of Hamburg , Hamburg , Germany
| | - Erica Valentini
- b European Molecular Biology Laboratory, Hamburg Unit , Hamburg , Germany
| | - Eileen Magbanua
- a Institute for Biochemistry and Molecular Biology, Department of Chemistry , University of Hamburg , Hamburg , Germany
| | - Marcel Kwiatkowski
- c University Medical Center Hamburg-Eppendorf , Department of Clinical Chemistry , Hamburg , Germany
| | | | - Boris Krichel
- e Heinrich Pette Institute, Leibniz Institute for Experimental Virology , Hamburg , Germany
| | - Kira Schamoni
- e Heinrich Pette Institute, Leibniz Institute for Experimental Virology , Hamburg , Germany
| | - Charlotte Uetrecht
- e Heinrich Pette Institute, Leibniz Institute for Experimental Virology , Hamburg , Germany.,f European XFEL GmbH , Hamburg , Germany
| | - Dmitri I Svergun
- b European Molecular Biology Laboratory, Hamburg Unit , Hamburg , Germany
| | - Hartmut Schlüter
- c University Medical Center Hamburg-Eppendorf , Department of Clinical Chemistry , Hamburg , Germany
| | - Martin Zacharias
- d Physics Department , Technical University Munich , Garching , Germany
| | - Ulrich Hahn
- a Institute for Biochemistry and Molecular Biology, Department of Chemistry , University of Hamburg , Hamburg , Germany
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Faryammanesh R, Lange T, Magbanua E, Haas S, Meyer C, Wicklein D, Schumacher U, Hahn U. SDA, a DNA aptamer inhibiting E- and P-selectin mediated adhesion of cancer and leukemia cells, the first and pivotal step in transendothelial migration during metastasis formation. PLoS One 2014; 9:e93173. [PMID: 24699049 PMCID: PMC3974700 DOI: 10.1371/journal.pone.0093173] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Accepted: 03/03/2014] [Indexed: 11/18/2022] Open
Abstract
Endothelial (E-) and platelet (P-) selectin mediated adhesion of tumor cells to vascular endothelium is a pivotal step of hematogenous metastasis formation. Recent studies have demonstrated that selectin deficiency significantly reduces metastasis formation in vivo. We selected an E- and P-Selectin specific DNA Aptamer (SDA) via SELEX (Systematic Evolution of Ligands by EXponential enrichment) with a Kd value of approximately 100 nM and the capability of inhibiting the interaction between selectin and its ligands. Employing human colorectal cancer (HT29) and leukemia (EOL-1) cell lines we could demonstrate an anti-adhesive effect for SDA in vitro. Under physiological shear stress conditions in a laminar flow adhesion assay, SDA inhibited dynamic tumor cell adhesion to immobilized E- or P-selectin. The stability of SDA for more than two hours allowed its application in cell-cell adhesion assays in cell culture medium. When adhesion of HT29 cells to TNFα-stimulated E-selectin presenting human pulmonary microvascular endothelial cells was analyzed, inhibition via SDA could be demonstrated as well. In conclusion, SDA is a potential new therapeutic agent that antagonizes selectin-mediated adhesion during metastasis formation in human malignancies.
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Affiliation(s)
- Rassa Faryammanesh
- Hamburg University, MIN-Faculty, Chemistry Department, Institute for Biochemistry and Molecular Biology, Hamburg, Germany
| | - Tobias Lange
- University Medical Center Hamburg-Eppendorf, University Cancer Center, Institute of Anatomy and Experimental Morphology, Hamburg, Germany
| | - Eileen Magbanua
- Hamburg University, MIN-Faculty, Chemistry Department, Institute for Biochemistry and Molecular Biology, Hamburg, Germany
| | - Sina Haas
- Hamburg University, MIN-Faculty, Chemistry Department, Institute for Biochemistry and Molecular Biology, Hamburg, Germany
| | - Cindy Meyer
- Hamburg University, MIN-Faculty, Chemistry Department, Institute for Biochemistry and Molecular Biology, Hamburg, Germany
| | - Daniel Wicklein
- University Medical Center Hamburg-Eppendorf, University Cancer Center, Institute of Anatomy and Experimental Morphology, Hamburg, Germany
| | - Udo Schumacher
- University Medical Center Hamburg-Eppendorf, University Cancer Center, Institute of Anatomy and Experimental Morphology, Hamburg, Germany
| | - Ulrich Hahn
- Hamburg University, MIN-Faculty, Chemistry Department, Institute for Biochemistry and Molecular Biology, Hamburg, Germany
- * E-mail:
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Magbanua E, Zivkovic T, Hansen B, Beschorner N, Meyer C, Lorenzen I, Grötzinger J, Hauber J, Torda AE, Mayer G, Rose-John S, Hahn U. d(GGGT) 4 and r(GGGU) 4 are both HIV-1 inhibitors and interleukin-6 receptor aptamers. RNA Biol 2013; 10:216-27. [PMID: 23235494 PMCID: PMC3594281 DOI: 10.4161/rna.22951] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Aptamers are oligonucleotides that bind targets with high specificity and affinity. They have become important tools for biosensing, target detection, drug delivery and therapy. We selected the quadruplex-forming 16-mer DNA aptamer AID-1 [d(GGGT) 4] with affinity for the interleukin-6 receptor (IL-6R) and identified single nucleotide variants that showed no significant loss of binding ability. The RNA counterpart of AID-1 [r(GGGU) 4] also bound IL-6R as quadruplex structure. AID-1 is identical to the well-known HIV inhibitor T30923, which inhibits both HIV infection and HIV-1 integrase. We also demonstrated that IL-6R specific RNA aptamers not only bind HIV-1 integrase and inhibit its 3' processing activity in vitro, but also are capable of preventing HIV de novo infection with the same efficacy as the established inhibitor T30175. All these aptamer target interactions are highly dependent on formation of quadruplex structure.
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Affiliation(s)
- Eileen Magbanua
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Tijana Zivkovic
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Björn Hansen
- Centre for Bioinformatics; Hamburg University; Hamburg, Germany
| | - Niklas Beschorner
- Heinrich Pette Institute; Leibnitz Institute for Experimental Virology; Hamburg, Germany
| | - Cindy Meyer
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Inken Lorenzen
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Joachim Grötzinger
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Joachim Hauber
- Heinrich Pette Institute; Leibnitz Institute for Experimental Virology; Hamburg, Germany
| | - Andrew E. Torda
- Centre for Bioinformatics; Hamburg University; Hamburg, Germany
| | - Günter Mayer
- Life and Medical Sciences Institute; University of Bonn; Bonn, Germany
| | - Stefan Rose-John
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Ulrich Hahn
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
- Correspondence to: Ulrich Hahn,
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Meyer C, Eydeler K, Magbanua E, Zivkovic T, Piganeau N, Lorenzen I, Grötzinger J, Mayer G, Rose-John S, Hahn U. Interleukin-6 receptor specific RNA aptamers for cargo delivery into target cells. RNA Biol 2012; 9:67-80. [PMID: 22258147 PMCID: PMC3342945 DOI: 10.4161/rna.9.1.18062] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Aptamers represent an emerging strategy to deliver cargo molecules, including dyes, drugs, proteins or even genes, into specific target cells. Upon binding to specific cell surface receptors aptamers can be internalized, for example by macropinocytosis or receptor mediated endocytosis. Here we report the in vitro selection and characterization of RNA aptamers with high affinity (Kd = 20 nM) and specificity for the human IL-6 receptor (IL-6R). Importantly, these aptamers trigger uptake without compromising the interaction of IL-6R with its natural ligands the cytokine IL-6 and glycoprotein 130 (gp130). We further optimized the aptamers to obtain a shortened, only 19-nt RNA oligonucleotide retaining all necessary characteristics for high affinity and selective recognition of IL-6R on cell surfaces. Upon incubation with IL-6R presenting cells this aptamer was rapidly internalized. Importantly, we could use our aptamer, to deliver bulky cargos, exemplified by fluorescently labeled streptavidin, into IL-6R presenting cells, thereby setting the stage for an aptamer-mediated escort of drug molecules to diseased cell populations or tissues.
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Affiliation(s)
- Cindy Meyer
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Katja Eydeler
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Eileen Magbanua
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Tijana Zivkovic
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Nicolas Piganeau
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
| | - Inken Lorenzen
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Joachim Grötzinger
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Günter Mayer
- Life and Medical Sciences Institute; University of Bonn; Bonn, Germany
| | - Stefan Rose-John
- Institute of Biochemistry; Medical Faculty; Christian-Albrechts-University; Kiel, Germany
| | - Ulrich Hahn
- Institute for Biochemistry and Molecular Biology; Chemistry Department; MIN-Faculty; Hamburg University; Hamburg, Germany
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Eydeler K, Magbanua E, Werner A, Ziegelmüller P, Hahn U. Fluorophore binding aptamers as a tool for RNA visualization. Biophys J 2009; 96:3703-7. [PMID: 19413975 DOI: 10.1016/j.bpj.2009.01.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Revised: 01/16/2009] [Accepted: 01/23/2009] [Indexed: 10/20/2022] Open
Abstract
Fluorescence correlation spectroscopy (FCS) is suitable for the detection of fluorescent molecules in living cells. For the visualization of mRNA, we genetically fused a fluorophore-specific RNA aptamer to the coding mRNA of the green fluorescent protein, as well as to noncoding sequences. Using these constructs, we showed that the aptamer portion of the mRNA still binds the fluorophore in the nanomolar range as determined via FCS. Furthermore, the binding took place in the context of total RNA extract. A tandem construct of the RNA aptamer even exhibited a lower K(d) than the monomer. This FCS-based method establishes a tool for minimal invasive detection of RNA at the single molecule level in individual living cells.
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Affiliation(s)
- Katja Eydeler
- Department of Chemistry, Institute of Biochemistry and Molecular Biology, University of Hamburg, 20146 Hamburg, Germany
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