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Amini A, Safdari Y, Tash Shamsabadi F, Azhdarinia A. Near-Infrared Fluorescence Imaging of EGFR-Overexpressing Tumors in the Mouse Xenograft Model Using scFv-IRDye800CW and Cetuximab-IRDye800CW. Mol Imaging 2022; 2022:1-10. [PMID: 35517713 PMCID: PMC9042373 DOI: 10.1155/2022/9589820] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Accepted: 03/21/2022] [Indexed: 12/18/2022] Open
Abstract
EGFR (epidermal growth factor receptor) is overexpressed in a variety of human cancers (including squamous cell carcinoma of head and neck, colon cancer, and some breast cancers) and therefore is regarded as an ideal target for cancer therapy or imaging purposes. In the current study, we produced a scFv-based near-infrared probe (called cet.Hum.scFv-IRDye-800CW) and evaluated its ability in recognizing and imaging of EGFR-overexpressing tumors in a mouse model. Like the molecular probe consisting of its parental antibody (cetuximab, an FDA-approved monoclonal antibody) and IRD800CW, cet.Hum.scFv-IRDye-800CW was able to recognize EGFR-overexpressing tumors in mice. cet.Hum.scFv-IRDye-800CW was found to be superior to the cetuximab-based probe in imaging of mouse tumors. The tumor-to-background ratio and blood clearance rate were higher when cet.Hum.scFv-IRDye-800CW was used as an imaging probe.
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Pei J, Juniper G, van den Berg NS, Nisho N, Broadt T, Welch AR, Yi GS, Raymundo RC, Chirita SU, Lu G, Krishnan G, Lee YJ, Kapoor S, Zhou Q, Colevas AD, Lui NS, Poultsides GA, Li G, Zinn KR, Rosenthal EL. Safety and Stability of Antibody-Dye Conjugate in Optical Molecular Imaging. Mol Imaging Biol 2020; 23:109-116. [PMID: 32880818 DOI: 10.1007/s11307-020-01536-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 04/22/2020] [Revised: 08/03/2020] [Accepted: 08/20/2020] [Indexed: 01/06/2023]
Abstract
PURPOSE The development of molecularly targeted tracers is likely to improve the accuracy of diagnostic, screening, and therapeutic tools. Despite the many therapeutic antibodies that are FDA-approved with known toxicity, only a limited number of antibody-dye conjugates have been introduced to the clinic. Thorough evaluation of the safety, stability, and pharmacokinetics of antibody conjugates in the clinical setting compared with their parental components could accelerate the clinical approval of antibodies as agents for molecular imaging. Here we investigate the safety and stability of a near-infrared fluorescent dye (IRDye800CW) conjugated panitumumab, an approved therapeutic antibody, and report on the product stability, pharmacokinetics, adverse events, and QTc interval changes in patients. PROCEDURES Panitumumab-IRDye800CW was made under good manufacturing practice (GMP) conditions in a single batch on March 26, 2014, and then evaluated over 4.5 years at 0, 3, and 6 months, and then at 6-month intervals thereafter. We conducted early phase trials in head and neck, lung, pancreas, and brain cancers with panitumumab-IRDye800CW. Eighty-one patients scheduled to undergo standard-of-care surgery were infused with doses between 0.06 to 2.83 mg/kg of antibody. Patient ECGs, blood samples, and adverse events were collected over 30-day post-infusion for analysis. RESULTS Eighty-one patients underwent infusion of the study drug at a range of doses. Six patients (7.4 %) experienced an adverse event that was considered potentially related to the drug. The most common event was a prolonged QTc interval which occurred in three patients (3.7 %). Panitumumab-IRDye800CW had two OOS results at 42 and 54 months while meeting all other stability testing criteria. CONCLUSIONS Panitumumab-IRDye800CW was safe and stable to administer over a 54-month window with a low rate of adverse events (7.4 %) which is consistent with the rate associated with panitumumab alone. This data supports re-purposing therapeutic antibodies as diagnostic imaging agents with limited preclinical toxicology studies.
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Affiliation(s)
- Jacqueline Pei
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Georgina Juniper
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Nynke S van den Berg
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Naoki Nisho
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Trevor Broadt
- Biopharmaceutical Development Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD, USA
| | - Anthony R Welch
- Biological Resources Branch/DTP/DCTD, National Cancer Institute, Frederick, MD, USA
| | - Grace S Yi
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Roan C Raymundo
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Stefania U Chirita
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Guolan Lu
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Giri Krishnan
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Yu-Jin Lee
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Shrey Kapoor
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Quan Zhou
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA.,Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA, USA
| | - A Dimitrios Colevas
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA
| | - Natalie S Lui
- Department of Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - George A Poultsides
- Department of Surgery, Section of Surgical Oncology, Stanford University School of Medicine, Stanford, CA, USA
| | - Gordon Li
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Kurt R Zinn
- Department of Radiology, Institute for Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, USA
| | - Eben L Rosenthal
- Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, 900 Blake Wilbur Drive, Stanford, CA, 94305, USA.
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Jacobsen MT, Fairhead M, Fogelstrand P, Howarth M. Amine Landscaping to Maximize Protein-Dye Fluorescence and Ultrastable Protein-Ligand Interaction. Cell Chem Biol 2017; 24:1040-1047.e4. [PMID: 28757182 PMCID: PMC5563079 DOI: 10.1016/j.chembiol.2017.06.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 05/15/2017] [Accepted: 06/27/2017] [Indexed: 12/11/2022]
Abstract
Chemical modification of proteins provides great opportunities to control and visualize living systems. The most common way to modify proteins is reaction of their abundant amines with N-hydroxysuccinimide (NHS) esters. Here we explore the impact of amine number and positioning on protein-conjugate behavior using streptavidin-biotin, a central research tool. Dye-NHS modification of streptavidin severely damaged ligand binding, necessitating development of a new streptavidin-retaining ultrastable binding after labeling. Exploring the ideal level of dye modification, we engineered a panel bearing 1–6 amines per subunit: “amine landscaping.” Surprisingly, brightness increased as amine number decreased, revealing extensive quenching following conventional labeling. We ultimately selected Flavidin (fluorophore-friendly streptavidin), combining ultrastable ligand binding with increased brightness after conjugation. Flavidin enhanced fluorescent imaging, allowing more sensitive and specific cell labeling in tissues. Flavidin should have wide application in molecular detection, providing a general insight into how to optimize simultaneously the behavior of the biomolecule and the chemical probe. Labeling of streptavidin with small-molecule dyes impairs ligand binding K121R mutation rescues ligand stability after dye labeling Landscaping of protein amines optimizes brightness Fluorophore-friendly streptavidin improves imaging specificity and sensitivity
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Affiliation(s)
- Michael T Jacobsen
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Michael Fairhead
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Per Fogelstrand
- Wallenberg Laboratory, Department of Molecular and Clinical Medicine, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
| | - Mark Howarth
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
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Hörner A, Hagendorn T, Schepers U, Bräse S. Photophysical properties and synthesis of new dye-cyclooctyne conjugates for multicolor and advanced microscopy. Bioconjug Chem 2015; 26:718-24. [PMID: 25734400 DOI: 10.1021/acs.bioconjchem.5b00059] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclooctyne conjugates with fluorophores are often used for bioorthogonal labeling in cells and tissues. However, no comprehensive library of one cyclooctyne core structure with different fluorescent dyes spanning the whole visible spectrum up to the NIR had been described so far. Hence, we synthesized and evaluated one cyclooctyne core structure which is easily accessible for the attachment of different dyes for multicolor imaging, FRET analysis, and study of metabolism in vivo. For these reasons we developed an easy one step synthesis starting from a known cyclooctyne. In combination with NHS-activated dyes, the cyclooctyne reacted to the dye DAB-MFCO conjugates within only 1-2 h at room temperature with high yields. We created conjugates with dyes that have high brightness and are bleaching stable with wavelengths from green to NIR. The ability to label glycans on cell surfaces was tested. All dye DAB-MFCO conjugates undergo click reactions on azide functionalized glycan structures with satisfactory photophysical properties. In total, seven different dye DAB-MFCO conjugates were synthesized; their photophysical properties and suitability for click labeling in biological applications were evaluated, making them suitable for single molecule and high resolution measurements.
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Affiliation(s)
- Anna Hörner
- †Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.,‡Light Technology Institute, Karlsruhe Institute of Technology, Engesserstraße 13, 76131 Karlsruhe, Germany
| | - Tobias Hagendorn
- †Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Ute Schepers
- †Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.,§Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Stefan Bräse
- †Institute of Organic Chemistry, Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.,§Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Beh C, Pan D, Lee J, Jiang X, Liu KJ, Mao HQ, Wang TH. Direct interrogation of DNA content distribution in nanoparticles by a novel microfluidics-based single-particle analysis. Nano Lett 2014; 14:4729-35. [PMID: 25054542 PMCID: PMC4134141 DOI: 10.1021/nl5018404] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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] [Received: 05/19/2014] [Revised: 07/01/2014] [Indexed: 05/29/2023]
Abstract
Nonviral gene delivery holds great promise not just as a safer alternative to viral vectors in traditional gene therapy applications, but also for regenerative medicine, induction of pluripotency in somatic cells, and RNA interference for gene silencing. Although it continues to be an active area of research, there remain many challenges to the rational design of vectors. Among these, the inability to characterize the composition of nanoparticles and its distribution has made it difficult to probe the mechanism of gene transfection process, since differences in the nanoparticle-mediated transfection exist even when the same vector is used. There is a lack of sensitive methods that allow for full characterization of DNA content in single nanoparticles and its distribution among particles in the same preparation. Here we report a novel spectroscopic approach that is capable of interrogating nanoparticles on a particle-by-particle basis. Using PEI/DNA and PEI-g-PEG/DNA nanoparticles as examples, we have shown that the distribution of DNA content among these nanoparticles was relatively narrow, with the average numbers of DNA of 4.8 and 6.7 per particle, respectively, in PEI/DNA and PEI-g-PEG/DNA nanoparticles. This analysis enables a more accurate description of DNA content in polycation/DNA nanoparticles. It paves the way toward comparative assessments of various types of gene carriers and provides insights into bridging the efficiency gap between viral and nonviral vehicles.
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Affiliation(s)
- Cyrus
W. Beh
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
| | - Deng Pan
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
| | - Jason Lee
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
| | - Xuan Jiang
- Department of Materials Science
and Engineering and Department of Mechanical Engineering, Whiting
School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
- Institute
for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland 21212, United States
| | - Kelvin J. Liu
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
| | - Hai-Quan Mao
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
- Department of Materials Science
and Engineering and Department of Mechanical Engineering, Whiting
School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
- Institute
for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland 21212, United States
- Translational
Tissue Engineering Center, Johns Hopkins
School of Medicine, 400
North Broadway, Baltimore, Maryland 21287, United
States
| | - Tza-Huei Wang
- Department
of Biomedical Engineering, Johns Hopkins
School of Medicine, 720
Rutland Avenue, Baltimore, Maryland 21205, United
States
- Department of Materials Science
and Engineering and Department of Mechanical Engineering, Whiting
School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
- Institute
for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland 21212, United States
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Pauli J, Licha K, Berkemeyer J, Grabolle M, Spieles M, Wegner N, Welker P, Resch-Genger U. New Fluorescent Labels with Tunable Hydrophilicity for the Rational Design of Bright Optical Probes for Molecular Imaging. Bioconjug Chem 2013; 24:1174-85. [PMID: 23758616 DOI: 10.1021/bc4000349] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jutta Pauli
- BAM Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics,
Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany
| | - Kai Licha
- mivenion GmbH, Robert-Koch-Platz 4, D-10115 Berlin, Germany
| | - Janis Berkemeyer
- BAM Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics,
Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany
| | - Markus Grabolle
- BAM Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics,
Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany
| | - Monika Spieles
- BAM Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics,
Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany
| | - Nicole Wegner
- mivenion GmbH, Robert-Koch-Platz 4, D-10115 Berlin, Germany
| | - Pia Welker
- mivenion GmbH, Robert-Koch-Platz 4, D-10115 Berlin, Germany
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Division 1.10 Biophotonics,
Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany
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8
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Li T, Byun JY, Kim BB, Shin YB, Kim MG. Label-free homogeneous FRET immunoassay for the detection of mycotoxins that utilizes quenching of the intrinsic fluorescence ofantibodies. Biosens Bioelectron 2013; 42:403-8. [DOI: 10.1016/j.bios.2012.10.085] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Accepted: 10/26/2012] [Indexed: 10/27/2022]
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Hennig A, Hatami S, Spieles M, Resch-Genger U. Excitation energy migration and trapping on the surface of fluorescent poly(acrylic acid)-grafted polymer particles. Photochem Photobiol Sci 2013; 12:729-37. [DOI: 10.1039/c2pp25364j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Würth C, González MG, Niessner R, Panne U, Haisch C, Genger UR. Determination of the absolute fluorescence quantum yield of rhodamine 6G with optical and photoacoustic methods – Providing the basis for fluorescence quantum yield standards. Talanta 2012; 90:30-7. [DOI: 10.1016/j.talanta.2011.12.051] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2011] [Revised: 12/14/2011] [Accepted: 12/18/2011] [Indexed: 11/23/2022]
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Pauli J, Grabolle M, Brehm R, Spieles M, Hamann FM, Wenzel M, Hilger I, Resch-Genger U. Suitable Labels for Molecular Imaging – Influence of Dye Structure and Hydrophilicity on the Spectroscopic Properties of IgG Conjugates. Bioconjug Chem 2011; 22:1298-308. [DOI: 10.1021/bc1004763] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Jutta Pauli
- BAM Bundesanstalt für Materialforschung und -prüfung, OE I.5, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany
| | - Markus Grabolle
- BAM Bundesanstalt für Materialforschung und -prüfung, OE I.5, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany
| | - Robert Brehm
- BAM Bundesanstalt für Materialforschung und -prüfung, OE I.5, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany
| | - Monika Spieles
- BAM Bundesanstalt für Materialforschung und -prüfung, OE I.5, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany
| | - Franziska M. Hamann
- Institut für Diagnostische und Interventionelle Radiologie des Klinikums der Friedrich-Schiller-Universität Jena (IDIR), Forschungszentrum Lobeda, Erlanger Allee 101, D-07747 Jena, Germany
| | | | - Ingrid Hilger
- Institut für Diagnostische und Interventionelle Radiologie des Klinikums der Friedrich-Schiller-Universität Jena (IDIR), Forschungszentrum Lobeda, Erlanger Allee 101, D-07747 Jena, Germany
| | - Ute Resch-Genger
- BAM Bundesanstalt für Materialforschung und -prüfung, OE I.5, Richard-Willstaetter-Str. 11, D-12489 Berlin, Germany
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Miao H, Xu SC, Yang YQ, Zhang JM, Dai Z, Sun B, Sun SQ, Zheng G, Feng TL, Zi Y, Liang C, Luo H. <i>Toxoplasma gondii</i> DNA Sensor Based on a Novel Ni-Magnetic Sensing Probe. ACTA ACUST UNITED AC 2010; 152-153:1510-3. [DOI: 10.4028/www.scientific.net/amr.152-153.1510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
we introduced a fast, specific, and sensitive sensing probe to detect Toxoplasma gondii DNA based on mechanism of fluorescence resonance energy transfer (FRET), and a multifunctional and magnetic-fluorescent CdTe/Ni quantum dots (mQDs) was prepared as energy donor, and BHQ2 was used as energy acceptor, respectively. CdTe/Ni mQDs were synthesized with a more simple method using Ni nanoparticles as core material and CdTe as shell material. The sensing probe was fabricated through labeling a stem-loop Toxoplasma gondii DNA oligonucleotide with CdTe/Ni mQDs at the 5′ end and BHQ2 at 3′ end, respectively, and the resulting sensing probe can be conveniently isolated and purified with a common magnet. Properties of mQDs and sensing probe were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), and fluorescence spectrum (FS) methods. The TEM data demonstrated that the size of Ni nanoparticles was estimated to be ~10nm, and size of CdTe/Ni is 15nm. XRD data showed similar spectrum of CdTe and CdTe/Ni, intensity of Ni (111) typical diffraction peak was detected, which inferred the formation of CdTe on surface of Ni core. An obvious fluorescence recovery (FR) was observed when the complete complimentary target Toxoplasma gondii DNA was introduced comparing with the target DNA with one-basepair-mismatch, this result revealed the sensing probe has high sensitivity and specificity. The current sensing probe will has great potential applications in the life science and gene diagnostics.
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Pauli J, Brehm R, Spieles M, Kaiser WA, Hilger I, Resch-Genger U. Novel fluorophores as building blocks for optical probes for in vivo near infrared fluorescence (NIRF) imaging. J Fluoresc 2010; 20:681-93. [PMID: 20213244 DOI: 10.1007/s10895-010-0603-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Accepted: 01/29/2010] [Indexed: 11/30/2022]
Abstract
Aiming at the identification of new fluorescent reporters for targeted optical probes, we assessed the application-relevant features of a novel asymmetric cyanine, DY-681, in comparison to the only clinically approved dye indocyanine green (ICG), the golden imaging standard Cy5.5, and the asymmetric cyanine DY-676 successfully exploited by us for the design of different contrast agents. This comparison included the analysis of the spectroscopic properties of the free fluorophores and their thermal stability in aqueous solution as well as their cytotoxic potential. In addition, the absorption and emission features of IgG-conjugated DY-681 were examined. The trimethine DY-681 exhibited spectral features closely resembling that of the pentamethine Cy5.5. Its high thermal stability in phosphate buffer saline (PBS) solution in conjunction with its low cytotoxicity, reaching similar values as determined for Cy5.5 and DY-676, renders this dye more attractive as ICG and, due to its improved fluorescence quantum yield in PBS, also superior to DY-676. Although in PBS, Cy5.5 was still more fluorescent, the fluorescence quantum yields (Phi(f)) of DY-681 and Cy5.5 in PBS containing 5 mass-% bovine serum albumin (BSA) were comparable. Labeling experiments with DY-681 and the model antibody IgG revealed promisingly high Phi(f) values of the bioconjugated dye.
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Affiliation(s)
- Jutta Pauli
- BAM Federal Institute for Materials Research and Testing, Division I.5, Richard-Willstaetter-Str. 11, 12489 Berlin, Germany
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Pauli J, Vag T, Haag R, Spieles M, Wenzel M, Kaiser WA, Resch-Genger U, Hilger I. An in vitro characterization study of new near infrared dyes for molecular imaging. Eur J Med Chem 2009; 44:3496-503. [DOI: 10.1016/j.ejmech.2009.01.019] [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] [Received: 07/03/2008] [Revised: 12/06/2008] [Accepted: 01/16/2009] [Indexed: 12/21/2022]
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16
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Kuznetsova S, Zauner G, Schmauder R, Mayboroda OA, Deelder AM, Aartsma TJ, Canters GW. A Förster-resonance-energy transfer-based method for fluorescence detection of the protein redox state. Anal Biochem 2005; 350:52-60. [PMID: 16430854 DOI: 10.1016/j.ab.2005.11.036] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [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: 08/10/2005] [Revised: 11/23/2005] [Accepted: 11/25/2005] [Indexed: 11/21/2022]
Abstract
A method for fluorescence detection of a protein's redox state based on resonance energy transfer from an attached fluorescence label to the prosthetic group of the redox protein is described and tested for proteins containing three types of prosthetic groups: a type-1 copper site (azurin, amicyanin, plastocyanin, and pseudoazurin), a heme group (cytochrome c550), and a flavin mononucleotide (flavodoxin). This method permits one to reliably distinguish between reduced and oxidized proteins and to perform potentiometric titrations at submicromolar concentrations.
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Affiliation(s)
- Sofya Kuznetsova
- Leiden Institute of Chemistry-Gorlaeus Laboratories, Leiden University, The Netherlands
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18
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Yu F, Yao D, Knoll W. Surface plasmon field-enhanced fluorescence spectroscopy studies of the interaction between an antibody and its surface-coupled antigen. Anal Chem 2003; 75:2610-7. [PMID: 12948127 DOI: 10.1021/ac026161y] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.9] [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: 11/28/2022]
Abstract
Surface plasmon field-enhanced fluorescence spectroscopy (SPFS) uses the greatly enhanced electromagnetic field of a surface plasmon mode for the excitation of surface-confined fluorophores. The ability to simultaneously monitor the interfacial refractive index changes and the fluorescence signals in real time offers a huge potential for applications of SPFS in surface immunoreaction detection. In this study, gold surfaces were functionalized by mixed self-assembled monolayers exposing an antigen (biotin) at a density that was varied over a wide range. Specific antibody-antigen interactions were observed for anti-biotin antibody solutions passing over the surfaces with a rather high flow speed driven by a home-built liquid-handling system. First, the use of the fluorophores Cy5 and Alexa Fluor 647 in SFPS-based immunoassays was investigated. It was found that Cy5 exhibits strong self-quenching, which makes it rather unsuitable for quantitative measurements. For the in situ measurement of the binding kinetics, an angular "detuning" effect was confirmed to negatively interfere with the fluorescence signal in cases where large SPR signals were detected. An in-depth comparison between the SPR and the fluorescence signal reveals that the fluorescence yield of the dyes depends strongly on the separation distance from the gold surface. And finally, we stress the ability of SPFS to detect binding to surfaces containing extremely diluted antigen density, where the SPR signal failed to follow.
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Affiliation(s)
- Fang Yu
- Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.
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Schobel U, Coille I, Brecht A, Steinwand GM, Gauglitz G. Miniaturization of a homogeneous fluorescence immunoassay based on energy transfer using nanotiter plates as high-density sample carriers. Anal Chem 2001; 73:5172-9. [PMID: 11721915 DOI: 10.1021/ac010456e] [Citation(s) in RCA: 20] [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: 11/28/2022]
Abstract
The miniaturization of a homogeneous competitive immunoassay to a final assay volume of 70 nL is described. As the sample carrier, disposable plastic nanotiter plates (NTP) with dimensions of 2 x 2 cm2 containing 25 x 25 wells, corresponding to approximately 15,000 wells on a traditional 96-well microtiter plate footprint, were used. Sample handling was accomplished by a piezoelectrically actuated micropipet. To reduce evaporation while pipetting the assays, the NTP was handled in a closed humid chamber and cooled to the point of condensation. To avoid washing steps, a homogeneous assay was developed that was based on energy-transfer (ET). As a model system, an antibody-based assay for the detection of the environmentally relevant compound, simazine, in drinking water was chosen. Antibodies were labeled with the long-wavelength-excitable sulfoindocyanine dye Cy5 (donor), and a tracer was synthesized by labeling BSA with a triazine derivative and the acceptor dye Cy5.5. At low analyte concentrations, the tracer was preferably bound to the antibody binding sites. As a result of the close proximity of Cy5.5 and Cy5, an efficient quenching of the Cy5 fluorescence occurred. Higher analyte concentrations led to a progressive binding of the analyte to the antibody binding sites. The increased Cy5 fluorescence was determined by using a scanning laser-induced fluorescence detector. The limit of detection (LOD), using an antibody concentration of 20 nM, was 0.32 microg/L, or 1.11 x 10(-16) mol of simazine. In comparison, the LOD of the 96-well microtiter-plate-based ET immunoassay (micro-ETIA) was 0.15 microg/L, or 1.87 x 10(-13) mol. The LOD of the optimized micro-ETIA at 1 nM IgG, was 0.01 microg/L.
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Affiliation(s)
- U Schobel
- Institute of Physical and Theoretical Chemistry, Tübingen, Germany.
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