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Moutsiopoulou A, Broyles D, Joda H, Dikici E, Kaur A, Kaifer A, Daunert S, Deo SK. Bioluminescent Protein-Inhibitor Pair in the Design of a Molecular Aptamer Beacon Biosensing System. Anal Chem 2020; 92:7393-7398. [PMID: 32410446 PMCID: PMC7955708 DOI: 10.1021/acs.analchem.0c00518] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Although bioluminescent molecular beacons designed around resonance quenchers have shown higher signal-to-noise ratios and increased sensitivity compared with fluorescent beacon systems, bioluminescence quenching is still comparatively inefficient. A more elegant solution to inefficient quenching can be realized by designing a competitive inhibitor that is structurally very similar to the native substrate, resulting in essentially complete substrate exclusion. In this work, we designed a conjugated anti-interferon-γ (IFN-γ) molecular aptamer beacon (MAB) attached to a bioluminescent protein, Gaussia luciferase (GLuc), and an inhibitor molecule with a similar structure to the native substrate coelenterazine. To prove that a MAB can be more sensitive and have a better signal-to-noise ratio, a bioluminescence-based assay was developed against IFN-γ and provided an optimized, physiologically relevant detection limit of 1.0 nM. We believe that this inhibitor approach may provide a simple alternative strategy to standard resonance quenching in the development of high-performance molecular beacon-based biosensing systems.
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Affiliation(s)
- Angeliki Moutsiopoulou
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
- University of Miami, Department of Chemistry, Coral Gables, Florida 33146, United States
| | - David Broyles
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
| | - Hamdi Joda
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
| | - Emre Dikici
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
| | - Avinash Kaur
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
| | - Angel Kaifer
- University of Miami, Department of Chemistry, Coral Gables, Florida 33146, United States
| | - Sylvia Daunert
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
- Dr. John T. Macdonald Foundation Biomedical Nanotechnology Institute of the University of Miami, Miami, Florida 33136, United States
- University of Miami Clinical and Translational Science Institute, Miami, Florida 33136, United States
| | - Sapna K Deo
- University of Miami, Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, Miami, Florida 33136, United States
- Dr. John T. Macdonald Foundation Biomedical Nanotechnology Institute of the University of Miami, Miami, Florida 33136, United States
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Moutsiopoulou A, Hunt E, Broyles D, Pereira CA, Woodward K, Dikici E, Kaifer A, Daunert S, Deo SK. Bioorthogonal Protein Conjugation: Application to the Development of a Highly Sensitive Bioluminescent Immunoassay for the Detection of Interferon-γ. Bioconjug Chem 2017; 28:1749-1757. [PMID: 28514139 DOI: 10.1021/acs.bioconjchem.7b00220] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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
Bioorthogonal conjugation eliminates the shortcomings of classical conjugation methods. The conjugation of antibodies to reporter proteins, such as bioluminescent protein, can be controlled with orthogonal conjugation methods. Here we report a bioluminescent immunoassay for the sensitive detection of interferon-γ (IFN-γ) that utilizes orthogonal conjugation of bioluminescent protein, Gaussia luciferase to anti-IFN-γ antibody. The IFN-γ is produced by the immune system and the detection of the IFN-γ is pivotal for the detection of persistent viral and bacterial infections. A bioorthogonal conjugation approach is used to conjugate an anti-IFN-γ antibody with a GLuc mutant containing the N-terminal tyrosine using formylbenzene diazonium hexafluorophosphate reagent (FBDP) in hydrophilic mild pH environment yielding high conjugation efficiency (60%). This reagent is shown to be specific for tyrosine (Tyr) residues. Therefore, conjugation through Tyr was orthogonal and not detrimental to the bioluminescence activity of GLuc. The immunoassay described in this paper is a sandwich type assay and involves a capture and a detection antibody. The assay was validated for its robustness, precision, accuracy, limit of detection, and recovery.
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Affiliation(s)
- Angeliki Moutsiopoulou
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States.,Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Eric Hunt
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
| | - David Broyles
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
| | | | - Kristen Woodward
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
| | - Emre Dikici
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
| | - Angel Kaifer
- Department of Chemistry, University of Miami , Coral Gables, Florida 33146, United States
| | - Sylvia Daunert
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
| | - Sapna K Deo
- Leonard M. Miller School of Medicine, Department of Biochemistry and Molecular Biology, University of Miami , Miami, Florida 33136, United States
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Zilio S, Vella JL, De la Fuente AC, Daftarian PM, Weed DT, Kaifer A, Marigo I, Leone K, Bronte V, Serafini P. 4PD Functionalized Dendrimers: A Flexible Tool for In Vivo Gene Silencing of Tumor-Educated Myeloid Cells. J Immunol 2017; 198:4166-4177. [PMID: 28396317 DOI: 10.4049/jimmunol.1600833] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 03/13/2017] [Indexed: 12/11/2022]
Abstract
Myeloid cells play a key role in tumor progression and metastasis by providing nourishment and immune protection, as well as facilitating cancer invasion and seeding to distal sites. Although advances have been made in understanding the biology of these tumor-educated myeloid cells (TEMCs), their intrinsic plasticity challenges our further understanding of their biology. Indeed, in vitro experiments only mimic the in vivo setting, and current gene-knockout technologies do not allow the simultaneous, temporally controlled, and cell-specific silencing of multiple genes or pathways. In this article, we describe the 4PD nanoplatform, which allows the in vivo preferential transfection and in vivo tracking of TEMCs with the desired RNAs. This platform is based on the conjugation of CD124/IL-4Rα-targeting peptide with G5 PAMAM dendrimers as the loading surface and can convey therapeutic or experimental RNAs of interest. When injected i.v. in mice bearing CT26 colon carcinoma or B16 melanoma, the 4PD nanoparticles predominantly accumulate at the tumor site, transfecting intratumoral myeloid cells. The use of 4PD to deliver a combination of STAT3- and C/EBPβ-specific short hairpin RNA or miR-142-3p confirmed the importance of these genes and microRNAs in TEMC biology and indicates that silencing of both genes is necessary to increase the efficacy of immune interventions. Thus, the 4PD nanoparticle can rapidly and cost effectively modulate and assess the in vivo function of microRNAs and mRNAs in TEMCs.
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Affiliation(s)
- Serena Zilio
- Department of Microbiology and Immunology, University of Miami, Miami, FL, 33136
| | - Jennifer L Vella
- Department of Microbiology and Immunology, University of Miami, Miami, FL, 33136
| | | | - Pirouz M Daftarian
- Department of Microbiology and Immunology, University of Miami, Miami, FL, 33136
| | - Donald T Weed
- Department of Otolaryngology, University of Miami, Miami, FL, 33136
| | - Angel Kaifer
- Department of Chemistry, University of Miami, Coral Gables, FL, 33146
| | - Ilaria Marigo
- Istituto Oncologico Veneto-Istituto di Ricovero e Cura a Carattere Scientifico, IOV-IRCCS, 35128 Padova, Italy; and
| | - Kevin Leone
- Istituto Oncologico Veneto-Istituto di Ricovero e Cura a Carattere Scientifico, IOV-IRCCS, 35128 Padova, Italy; and
| | - Vincenzo Bronte
- Department of Medicine, Verona University Hospital, 37134 Verona, Italy
| | - Paolo Serafini
- Department of Microbiology and Immunology, University of Miami, Miami, FL, 33136;
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Kaifer A, Gustowski DA, Echegoyen L, Gatto VJ, Schultz RA, Cleary TP, Morgan CR, Goli DM, Rios AM, Gokel GW. Electrochemical switching of lariat ethers. Survey of cation binding by neutral and reduced forms of one- and two-armed carbon- and nitrogen-pivot lariat ethers. J Am Chem Soc 2002. [DOI: 10.1021/ja00293a027] [Citation(s) in RCA: 77] [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] [Indexed: 11/29/2022]
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Echegoyen L, Kaifer A, Durst H, Schultz RA, Dishong DM, Goli DM, Gokel GW. Dynamics of crown and lariat ether cation complexation assessed by carbon-13 NMR relaxation times. J Am Chem Soc 2002. [DOI: 10.1021/ja00330a011] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gustowski DA, Echegoyen L, Goli DM, Kaifer A, Schultz RA, Gokel GW. Electrochemically switched cation binding in nitrobenzene-substituted, nitrogen-pivot lariat ethers. J Am Chem Soc 2002. [DOI: 10.1021/ja00318a014] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kaifer A, Echegoyen L, Gustowski DA, Goli DM, Gokel GW. Enhanced sodium cation binding by electrochemically reduced nitrobenzene-substituted lariat ethers. J Am Chem Soc 2002. [DOI: 10.1021/ja00362a023] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kaifer A, Durst HD, Echegoyen L, Dishong DM, Schultz RA, Gokel GW. Dynamics of sodium cation complexation by carbon- and nitrogen-pivot lariat ethers. J Org Chem 2002. [DOI: 10.1021/jo00137a042] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Echegoyen L, Kaifer A, Durst HD, Gokel GW. Carbon-13 NMR chemical shifts and relaxation times as a probe of structural and dynamic properties in alkali and alkaline earth metal cryptate complexes. J Org Chem 2002. [DOI: 10.1021/jo00178a023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gustowski DA, Gatto VJ, Kaifer A, Echegoyen L, Godt RE, Gokel GW. Cation effects on the cyclic voltammograms of azotoluene and the potassium cation selectivity of the electrochemically reduced azo-cryptand 7,16-azobis(1,3-phenylenemethylene)-1,4,10,13-tetraoxa-7,16-diazaoctadecane. ACTA ACUST UNITED AC 1984. [DOI: 10.1039/c39840000923] [Citation(s) in RCA: 12] [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: 11/21/2022]
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