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Spaziani S, Quero G, Managò S, Zito G, Terracciano D, Macchia PE, Galeotti F, Pisco M, De Luca AC, Cusano A. SERS assisted sandwich immunoassay platforms for ultrasensitive and selective detection of human Thyroglobulin. Biosens Bioelectron 2023; 233:115322. [PMID: 37100718 DOI: 10.1016/j.bios.2023.115322] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 03/15/2023] [Accepted: 04/13/2023] [Indexed: 04/28/2023]
Abstract
We developed an immunoassay platform for the detection of human Thyroglobulin (Tg) to be integrated with fine-needle aspiration biopsy for early detection of lymph node metastases in thyroid cancer patients. The sensing platform detects Tg by a sandwich immunoassay involving a self-assembled surface-enhanced Raman scattering (SERS) substrate assisted by functionalized gold nanoparticles that provide additional Raman signal amplification and improved molecular specificity. Specifically, the SERS-active substrates were functionalized with Tg Capture antibodies and fabricated either on-chip or on optical fiber tips by nanosphere lithography. Gold nanoparticles were functionalized with Detection antibodies and conjugated with 4-mercaptobenzoic acid, which serves as a Raman reporter. The sandwich assay platform was validated in the planar configuration and a detection limit as low as 7 pg/mL was successfully achieved. Careful morphological examination of the SERS substrates before and after Tg measurements further assessed the effective capture of nanoparticles and correlated the average nanoparticle coverage with the Tg concentration obtained by SERS measurements. The sandwich assay was successfully demonstrated on washout fluids of fine needle aspiration biopsies from cancer patients and confirmed the high specificity of the proposed methodology when complex biological matrices are considered. Finally, SERS optrodes were fabricated and successfully used to detect Tg concentration by applying the same bio-recognition strategy and Raman interrogation through an optical fiber. This opens the possibility of transferring the Tg detection approach to the optical fiber tip to develop point-of-care platforms that can be directly integrated into fine needle aspiration biopsies.
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Affiliation(s)
- S Spaziani
- Optoelectronic Division-Engineering Department, University of Sannio, 82100, Benevento, Italy; Centro Regionale Information Communication Technology (CeRICT Scrl), 82100, Benevento, Italy
| | - G Quero
- Optoelectronic Division-Engineering Department, University of Sannio, 82100, Benevento, Italy; Centro Regionale Information Communication Technology (CeRICT Scrl), 82100, Benevento, Italy
| | - S Managò
- Institute for Experimental Endocrinology and Oncology "Gaetano Salvatore" (IEOS), Second Unit, National Research Council, 80131, Napoli, Italy
| | - G Zito
- Institute of Applied Sciences & Intelligent Systems (ISASI), National Research Council, Naples Unit, 80131, Napoli, Italy
| | - D Terracciano
- Dipartimento di Medicina Clinica e Chirurgia, Scuola di Medicina, Università degli Studi di Napoli Federico II, Napoli, 80131, Italy
| | - P E Macchia
- Dipartimento di Scienze Mediche Traslazionali, Scuola di Medicina, Università degli Studi di Napoli Federico II, Napoli, 80131, Italy
| | - F Galeotti
- Istituto di Scienze e Tecnologie Chimiche "G. Natta" (SCITEC), National Research Council, 20133, Milano, Italy
| | - M Pisco
- Optoelectronic Division-Engineering Department, University of Sannio, 82100, Benevento, Italy; Centro Regionale Information Communication Technology (CeRICT Scrl), 82100, Benevento, Italy.
| | - A C De Luca
- Institute for Experimental Endocrinology and Oncology "Gaetano Salvatore" (IEOS), Second Unit, National Research Council, 80131, Napoli, Italy.
| | - A Cusano
- Optoelectronic Division-Engineering Department, University of Sannio, 82100, Benevento, Italy; Centro Regionale Information Communication Technology (CeRICT Scrl), 82100, Benevento, Italy
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Kinetics and interaction studies of anti-tetraspanin antibodies and ICAM-1 with extracellular vesicle subpopulations using continuous flow quartz crystal microbalance biosensor. Biosens Bioelectron 2022; 206:114151. [PMID: 35259607 DOI: 10.1016/j.bios.2022.114151] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 02/18/2022] [Accepted: 02/28/2022] [Indexed: 02/08/2023]
Abstract
Continuous flow quartz crystal microbalance (QCM) was utilized to study binding kinetics between EV subpopulations (exomere- and exosome-sized EVs) and four affinity ligands: monoclonal antibodies against tetraspanins (anti-CD9, anti-CD63, and anti-CD81) and recombinant intercellular adhesion molecule-1 (ICAM-1) or CD54 protein). High purity CD9+, CD63+, and CD81+ EV subpopulations of <50 nm exomeres and 50-80 nm exosomes were isolated and fractionated using our recently developed on-line coupled immunoaffinity chromatography - asymmetric flow field-flow fractionation system. Adaptive Interaction Distribution Algorithm (AIDA), specifically designed for the analysis of complex biological interactions, was used with a four-step procedure for reliable estimation of the degree of heterogeneity in rate constant distributions. Interactions between exomere-sized EVs and anti-tetraspanin antibodies demonstrated two interaction sites with comparable binding kinetics and estimated dissociation constants Kd ranging from nM to fM. Exomeres exhibited slightly higher affinity compared to exosomes. The highest affinity with anti-tetraspanin antibodies was achieved with CD63+ EVs. The interaction of EV subpopulations with ICAM-1 involved in cell internalization of EVs was also investigated. EV - ICAM-1 interaction was also of high affinity (nM to pM range) with overall lower affinity compared to the interactions of anti-tetraspanin antibodies and EVs. Our findings proved that QCM is a valuable label-free tool for kinetic studies with limited sample concentration, and that advanced algorithms, such as AIDA, are crucial for proper determination of kinetic heterogeneity. To the best of our knowledge, this is the first kinetic study on the interaction between plasma-derived EV subpopulations and anti-tetraspanin antibodies and ICAM-1.
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de Moraes MOS, de Moraes Segundo JDDP, Paula MMDS, Sales MGF, Brito WR. Highly sensitive electrochemical immunosensor using a protein-polyvinylidene fluoride nanocomposite for human thyroglobulin. Bioelectrochemistry 2021; 142:107888. [PMID: 34325091 DOI: 10.1016/j.bioelechem.2021.107888] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/12/2021] [Accepted: 07/13/2021] [Indexed: 01/16/2023]
Abstract
The highly sensitive detection of serum thyroglobulin (Tg) is essential in the post-treatment follow-up of patients with differentiated thyroid cancer undergoing total or partial thyroidectomy and radioactive iodine ablation and requires sensitive, accurate and stable methods. This work proposes an electrochemical immunosensor for the detection of serum Tg antigen, making use of innovative nanocomposites including polyvinylidene fluoride (PVDF) microparticles coated with streptavidin (MP) and gold nanoparticles (AuNPs). The functionalized polymer matrices were characterized by UV-Vis, FTIR, XPS, SEM, dynamic light scattering, and free surface energy. Immobilization of biotin-labeled anti-thyroglobulin monoclonal antibodies was achieved by binding these to the polymer nanocomposite via streptavidin proteins. The analytical response was measured in quintuplicate and had a linear profile from 2.0 to 10.0 ng/mL Tg, with r2 of 0.985. The limits of detection and quantification were excellent, equal to 0.015 and 0.047 ng/mL, respectively. In addition, the recovery factor was equal to 95.4% (1.0 ng/mL Tg). Overall, the innovative polymer-based nanocomposite used herein enabled the production of an electrochemical-based immunosensor with excellent sensitivity, selectivity, and reproducibility. It evidenced the remarkable potential of determining low levels of Tg in in vitro assays, thereby suggesting that it may be considered for the analyzes of serum patients.
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Affiliation(s)
- Maria Oneide Silva de Moraes
- LABEL, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas 69067-005, Brazil; Thematic Laboratory of Microscopy and Nanotechnology, National Institute of Amazonian Research Manaus, Amazonas 69067-001, Brazil.
| | | | | | - Maria Goreti Ferreira Sales
- BioMark@UC, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, Coimbra 3030-790, Portugal
| | - Walter Ricardo Brito
- LABEL, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas 69067-005, Brazil.
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