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Liang R, Wang F, Li S, Niu Y, Sun Y, Hong S, Fan A. A sensitive gold nanoflower-based lateral flow assay coupled with gold staining technique for the detection of SARS-CoV-2 antigen. Mikrochim Acta 2024; 191:434. [PMID: 38951317 DOI: 10.1007/s00604-024-06502-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Accepted: 06/11/2024] [Indexed: 07/03/2024]
Abstract
An enhanced lateral flow assay (LFA) is presented for rapid and highly sensitive detection of acute respiratory syndrome coronavirus-2 (SARS-CoV-2) antigens with gold nanoflowers (Au NFs) as signaling markers and gold enhancement to amplify the signal intensities. First, the effect of the morphology of gold nanomaterials on the sensitivity of LFA detection was investigated. The results showed that Au NFs prepared by the seed growth method showed a 5-fold higher detection sensitivity than gold nanoparticles (Au NPs) of the same particle size, which may benefit from the higher extinction coefficient and larger specific surface area of Au NFs. Under the optimized experimental conditions, the Au NFs-based LFA exhibited a detection limit (LOD) of 25 pg mL-1 for N protein using 135 nm Au NFs as the signaling probes. The signal was further amplified by using a gold enhancement strategy, and the LOD for the detection of N protein achieved was 5 pg mL-1. The established LFA also exhibited good repeatability and stability and showed applicability in the diagnosis of SARS-CoV-2 infection.
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Affiliation(s)
- Rushi Liang
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China
| | - Feiqian Wang
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China
| | - Shanshan Li
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China
| | - Yajing Niu
- Beijing Pharma and Biotech Center, Beijing, 100035, PR China
| | - Yinuo Sun
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China
| | - Sile Hong
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China
| | - Aiping Fan
- School of Pharmaceutical Science and Technology, Tianjin University, Tianjin300072, PR China.
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2
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Tekin YS, Kul SM, Sagdic O, Rodthongkum N, Geiss B, Ozer T. Optical biosensors for diagnosis of COVID-19: nanomaterial-enabled particle strategies for post pandemic era. Mikrochim Acta 2024; 191:320. [PMID: 38727849 PMCID: PMC11087243 DOI: 10.1007/s00604-024-06373-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Accepted: 04/19/2024] [Indexed: 05/13/2024]
Abstract
The COVID-19 pandemic underlines the need for effective strategies for controlling virus spread and ensuring sensitive detection of SARS-CoV-2. This review presents the potential of nanomaterial-enabled optical biosensors for rapid and low-cost detection of SARS-CoV-2 biomarkers, demonstrating a comprehensive analysis including colorimetric, fluorescence, surface-enhanced Raman scattering, and surface plasmon resonance detection methods. Nanomaterials including metal-based nanomaterials, metal-organic frame-based nanoparticles, nanorods, nanoporous materials, nanoshell materials, and magnetic nanoparticles employed in the production of optical biosensors are presented in detail. This review also discusses the detection principles, fabrication methods, nanomaterial synthesis, and their applications for the detection of SARS-CoV-2 in four categories: antibody-based, antigen-based, nucleic acid-based, and aptamer-based biosensors. This critical review includes reports published in the literature between the years 2021 and 2024. In addition, the review offers critical insights into optical nanobiosensors for the diagnosis of COVID-19. The integration of artificial intelligence and machine learning technologies with optical nanomaterial-enabled biosensors is proposed to improve the efficiency of optical diagnostic systems for future pandemic scenarios.
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Affiliation(s)
- Yusuf Samil Tekin
- Department of Biomedical Engineering, Graduate Education Institute, Malatya Turgut Ozal University, 44210, Battalgazi, Malatya, Turkey
| | - Seyda Mihriban Kul
- Department of Food Engineering, Faculty of Chemical-Metallurgical Engineering, Yildiz Technical University, 34220, Istanbul, Turkey
| | - Osman Sagdic
- Department of Food Engineering, Faculty of Chemical-Metallurgical Engineering, Yildiz Technical University, 34220, Istanbul, Turkey
| | - Nadnudda Rodthongkum
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Soi Chula 12, Phayathai Road, Bangkok, 10330, Patumwan, Thailand
| | - Brian Geiss
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, 80523-1019, USA.
| | - Tugba Ozer
- Department of Bioengineering, Faculty of Chemical-Metallurgical Engineering, Yildiz Technical University, 34220, Istanbul, Turkey.
- Health Biotechnology Joint Research and Application Center of Excellence, Esenler, 34220, Istanbul, Turkey.
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3
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Wu F, Jiang Y, Yang H, Ma L. Development of Detection Antibody Targeting the Linear Epitope in SARS-CoV-2 Nucleocapsid Protein with Ultra-High Sensitivity. Int J Mol Sci 2024; 25:4436. [PMID: 38674021 PMCID: PMC11050370 DOI: 10.3390/ijms25084436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/04/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
The COVID-19 pandemic caused by SARS-CoV-2 highlighted the importance of reliable detection methods for disease control and surveillance. Optimizing detection antibodies by rational screening antigens would improve the sensitivity and specificity of antibody-based detection methods such as colloidal gold immunochromatography. In this study, we screened three peptide antigens with conserved sequences in the N protein of SARS-CoV-2 using bioinformatical and structural biological analyses. Antibodies that specifically recognize these peptides were prepared. The epitope of the peptide that had the highest binding affinity with its antibody was located on the surface of the N protein, which was favorable for antibody binding. Using the optimal antibody that can recognize this epitope, we developed colloidal gold immunochromatography, which can detect the N protein at 10 pg/mL. Importantly, this antibody could effectively recognize both the natural peptide antigen and mutated peptide antigen in the N protein, showing the feasibility of being applied in the large-scale population testing of SARS-CoV-2. Our study provides a platform with reference significance for the rational screening of detection antibodies with high sensitivity, specificity, and reliability for SARS-CoV-2 and other pathogens.
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Affiliation(s)
- Feng Wu
- Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (F.W.); (H.Y.)
- Shenzhen Institute of Drug Control, Shenzhen 518057, China
| | - Yike Jiang
- Institute of Biomedical Health Technology and Engineering, Shenzhen Bay Laboratory, Shenzhen 518132, China;
| | - Hongtian Yang
- Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (F.W.); (H.Y.)
- Institute of Biomedical Health Technology and Engineering, Shenzhen Bay Laboratory, Shenzhen 518132, China;
| | - Lan Ma
- Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; (F.W.); (H.Y.)
- Institute of Biomedical Health Technology and Engineering, Shenzhen Bay Laboratory, Shenzhen 518132, China;
- State Key Laboratory of Chemical Oncogenomics, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
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Lao T, Farnos O, Bueno A, Alvarez A, Rodríguez E, Palacios J, de la Luz KR, Kamen A, Carpio Y, Estrada MP. Transient Expression in HEK-293 Cells in Suspension Culture as a Rapid and Powerful Tool: SARS-CoV-2 N and Chimeric SARS-CoV-2N-CD154 Proteins as a Case Study. Biomedicines 2023; 11:3050. [PMID: 38002050 PMCID: PMC10669214 DOI: 10.3390/biomedicines11113050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/03/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023] Open
Abstract
In a previous work, we proposed a vaccine chimeric antigen based on the fusion of the SARS-CoV-2 N protein to the extracellular domain of the human CD40 ligand (CD154). This vaccine antigen was named N-CD protein and its expression was carried out in HEK-293 stably transfected cells, grown in adherent conditions and serum-supplemented medium. The chimeric protein obtained in these conditions presented a consistent pattern of degradation. The immunization of mice and monkeys with this chimeric protein was able to induce a high N-specific IgG response with only two doses in pre-clinical experiments. In order to explore ways to diminish protein degradation, in the present work, the N and N-CD proteins were produced in suspension cultures and serum-free media following transient transfection of the HEK-293 clone 3F6, at different scales, including stirred-tank controlled bioreactors. The results showed negligible or no degradation of the target proteins. Further, clones stably expressing N-CD were obtained and adapted to suspension culture, obtaining similar results to those observed in the transient expression experiments in HEK-293-3F6. The evidence supports transient protein expression in suspension cultures and serum-free media as a powerful tool to produce in a short period of time high levels of complex proteins susceptible to degradation, such as the SARS-CoV-2 N protein.
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Affiliation(s)
- Thailin Lao
- Center for Genetic Engineering and Biotechnology, Animal Biotechnology Department, Havana 10600, Cuba; (T.L.)
| | - Omar Farnos
- Department of Bioengineering, McGill University, Montreal, QC H3A 0E9, Canada; (O.F.); (A.K.)
| | - Alexi Bueno
- Process Development Department, Center of Molecular Immunology, Havana 11600, Cuba (J.P.); (K.R.d.l.L.)
| | - Anays Alvarez
- Center for Genetic Engineering and Biotechnology, Animal Biotechnology Department, Havana 10600, Cuba; (T.L.)
| | - Elsa Rodríguez
- Center for Genetic Engineering and Biotechnology, Animal Biotechnology Department, Havana 10600, Cuba; (T.L.)
| | - Julio Palacios
- Process Development Department, Center of Molecular Immunology, Havana 11600, Cuba (J.P.); (K.R.d.l.L.)
| | - Kathya Rashida de la Luz
- Process Development Department, Center of Molecular Immunology, Havana 11600, Cuba (J.P.); (K.R.d.l.L.)
| | - Amine Kamen
- Department of Bioengineering, McGill University, Montreal, QC H3A 0E9, Canada; (O.F.); (A.K.)
| | - Yamila Carpio
- Center for Genetic Engineering and Biotechnology, Animal Biotechnology Department, Havana 10600, Cuba; (T.L.)
| | - Mario Pablo Estrada
- Center for Genetic Engineering and Biotechnology, Animal Biotechnology Department, Havana 10600, Cuba; (T.L.)
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Cabanillas-Bernal O, Valdovinos-Navarro BJ, Cervantes-Luevano KE, Sanchez-Campos N, Licea-Navarro AF. Unleashing the power of shark variable single domains (VNARs): broadly neutralizing tools for combating SARS-CoV-2. Front Immunol 2023; 14:1257042. [PMID: 37753081 PMCID: PMC10518403 DOI: 10.3389/fimmu.2023.1257042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 08/18/2023] [Indexed: 09/28/2023] Open
Abstract
The pandemic caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) generated a joint global effort to develop vaccines and other treatments that could mitigate the negative effects and the rapid spread of the virus. Single-domain antibodies derived from various sources, including cartilaginous fish, camelids, and humans, have gained attention as promising therapeutic tools against coronavirus disease 2019. Shark-derived variable new antigen receptors (VNARs) have emerged as the smallest naturally occurring antigen-binding molecules. Here, we compile and review recent published studies on VNARs with the capacity to recognize and/or neutralize SARS-CoV-2. We found a close balance between the use of natural immune libraries and synthetic VNAR libraries for the screening against SARS-CoV-2, with phage display being the preferred display technology for the selection of VNARs against this virus. In addition, we discuss potential modifications and engineering strategies employed to improve the neutralization potential of VNARs, such as exploring fusion with the Fc domain of human Immunoglobulin G (IgG) to increase avidity and therapeutic potential. This research highlights the potential of VNARs as powerful molecular tools in the fight against infectious diseases.
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Affiliation(s)
| | | | | | | | - Alexei F. Licea-Navarro
- Biomedical Innovation Department, Centro de Investigación Científica y Educación Superior de Ensenada, (CICESE), Ensenada, Baja California, Mexico
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6
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Yang W, Yan J, Liu R, Xie Y, Wang C, Kou Z, Li P, Jiang M. Ultra-sensitive specific detection of nucleic acids in pathogenic infections by Ta 2C-MXene sensitization-based ultrafine plasmon spectroscopy combs. SENSORS AND ACTUATORS. B, CHEMICAL 2023; 387:133785. [PMID: 37038556 PMCID: PMC10077810 DOI: 10.1016/j.snb.2023.133785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/30/2023] [Accepted: 04/05/2023] [Indexed: 05/21/2023]
Abstract
Accurate and rapid population-scale screening techniques based on SARS-CoV-2 RNA are essential in preventing and controlling the COVID-19 epidemic. However, the sensitivity and specificity of the assay signal are challenged by the problems of target dilution and sample contamination inherent in high-volume pooled testing. Here, we reported a collaborative system of high-loaded hybrid probes targeting N and OFR1a coupling with the novel Ta2C-M/Au/TFBG biosensor, providing high-intensity vector signals for detecting SARS-CoV-2. The method relies on a segmental modification approach to saturable modify multiple activation sites of SARS-CoV-2 on the high-performance Ta2C-M surface. The coupling of multi-site synergy with composite excited TFBG results in excellent signal transduction, detection limits (0.2 pg/mL), and hybridization efficiency. Without relying on amplification, the collaborative system achieved specific differentiation of 30 clinical samples in an average diagnostic time of 1.8 min. In addition, for the first time, a kinetic determination of dilution mixed samples was achieved and showed a high-intensity carrier signal and fantastic stability. Therefore, it can be used as a collaborative, integrated tool to play a massive role in the screening, prevention, and control of COVID-19 and other epidemics.
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Affiliation(s)
- Wen Yang
- School of Control Science and Engineering, Shandong University, Jingshi Road, 250061 Jinan, China
| | - Jie Yan
- School of Control Science and Engineering, Shandong University, Jingshi Road, 250061 Jinan, China
| | - Runcheng Liu
- School of Control Science and Engineering, Shandong University, Jingshi Road, 250061 Jinan, China
| | - Yan Xie
- The Second Hospital of Shandong University, No. 247 Beiyuan Street, Jinan 250033, Shandong, China
| | - Chuanxin Wang
- The Second Hospital of Shandong University, No. 247 Beiyuan Street, Jinan 250033, Shandong, China
| | - Zengqiang Kou
- The Center for Disease Control and Prevention of Shandong, No. 16992, Jingshi Road, Lixia District, Jinan 250014, Shandong, China
| | - Peilong Li
- The Second Hospital of Shandong University, No. 247 Beiyuan Street, Jinan 250033, Shandong, China
| | - Mingshun Jiang
- School of Control Science and Engineering, Shandong University, Jingshi Road, 250061 Jinan, China
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7
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Pan W, Han Z, Chang Y, Yan X, Zhou F, Shen S, Duan X. Rational design of multivalent biosensor surfaces to enhance viral particle capture. J Mater Chem B 2023; 11:4511-4522. [PMID: 37161578 DOI: 10.1039/d2tb02828j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Viral particles bind to receptors through multivalent protein interactions. Such high avidity interactions on sensor surfaces are less studied. In this work, three polyelectrolytes that can form biosensing surfaces with different interfacial characteristics in probe density and spatial arrangement were designed. Quartz crystal microbalance, interferometry and atomic force microscopy were used to study their surface density and binding behaviors with proteins and virus particles. A multivalent adsorption kinetic model was developed to estimate the number of bonds from the viral particles bound to the polyelectrolyte surfaces. Experimental results show that the heterogeneous 3D surface with jagged forest-like structure enhances the virus capture ability by maximizing the multivalent interactions. As a proof of concept, specific coronavirus detection was achieved in spiked swab samples. These results indicate the importance of both probe density and their spatial arrangement on the sensing performance, which could be used as a guideline for rational biosensing surface design.
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Affiliation(s)
- Wenwei Pan
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
- Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
| | - Ziyu Han
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Ye Chang
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Xu Yan
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Feng Zhou
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Sihong Shen
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Xuexin Duan
- State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
- College of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
- Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
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8
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A Novel Strategy for Rapid Fluorescence Detection of FluB and SARS-CoV-2. Molecules 2023; 28:molecules28052104. [PMID: 36903349 PMCID: PMC10004075 DOI: 10.3390/molecules28052104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 03/05/2023] Open
Abstract
Undoubtedly, SARS-CoV-2 has caused an outbreak of pneumonia that evolved into a worldwide pandemic. The confusion of early symptoms of the SARS-CoV-2 infection with other respiratory virus infections made it very difficult to block its spread, leading to the expansion of the outbreak and an unreasonable demand for medical resource allocation. The traditional immunochromatographic test strip (ICTS) can detect one analyte with one sample. Herein, this study presents a novel strategy for the simultaneous rapid detection of FluB/SARS-CoV-2, including quantum dot fluorescent microspheres (QDFM) ICTS and a supporting device. The ICTS could be applied to realize simultaneous detection of FluB and SARS-CoV-2 with one test in a short time. A device supporting FluB/SARS-CoV-2 QDFM ICTS was designed and had the characteristics of being safe, portable, low-cost, relatively stable, and easy to use, ensuring the device could replace the immunofluorescence analyzer in cases where there is no need for quantification. This device does not need to be operated by professional and technical personnel and has commercial application potential.
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Vashisht K, Goyal B, Pasupureddy R, Na BK, Shin HJ, Sahu D, De S, Chakraborti S, Pandey KC. Exploring the Immunodominant Epitopes of SARS-CoV-2 Nucleocapsid Protein as Exposure Biomarker. Cureus 2023; 15:e34827. [PMID: 36919074 PMCID: PMC10008226 DOI: 10.7759/cureus.34827] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/09/2023] [Indexed: 02/12/2023] Open
Abstract
Background The nucleocapsid protein (N protein) of SARS-CoV-2 is undeniably a potent target for the development of diagnostic tools due to its abundant expression and lower immune evasion pressure compared to spike (S) protein. Methods Blood samples of active COVID-19 infections (n=71) and post-COVID-19 (n=11) were collected from a tertiary care hospital in India; pre-COVID-19 (n=12) sera samples served as controls. Real-time reverse transcriptase-PCR (rRT-PCR) confirmed pooled sera samples (n=5) were used with PEPperCHIP® SARS-CoV-2 Proteome Microarray (PEPperPRINT GmbH, Germany) to screen immunodominant epitopes of SARS-CoV-2. Highly immunodominant epitopes were then commercially synthesized and further validated for their immunoreactivity by dot-blot and ELISA. Results The lowest detectable concentration (LDC) of the N1 peptide in the dot-blot assay was 12.5 µg demonstrating it to be fairly immunoreactive compared to control sera. IgG titers against the contiguous peptide (N2: 156AIVLQLPQGTTLPKGFYAEGS176) was found to be significantly higher (p=0.018) in post-COVID-19 compared to pre-COVID-19 control sera. These results suggested that N2-specific IgG titers buildup over time as expected in post-COVID-19 sera samples, while a non-significant immunoreactivity of the N2 peptide was also observed in active-COVID-19 sera samples. However, there were no significant differences in the total IgG titers between active COVID-19 infections, post-COVID-19 and pre-COVID-19 controls. Conclusion The N2-specific IgG titers in post-COVID-19 samples demonstrated the potential of N protein as an exposure biomarker, particularly in sero-surveillance studies.
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Affiliation(s)
- Kapil Vashisht
- Parasite-Host Biology, Indian Council of Medical Research-National Institute of Malaria Research (ICMR-NIMR), Delhi, IND
| | - Bharti Goyal
- Parasite-Host Biology, Indian Council of Medical Research-National Institute of Malaria Research (ICMR-NIMR), Delhi, IND.,Biological Sciences, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, IND
| | - Rahul Pasupureddy
- Parasite-Host Biology, Indian Council of Medical Research-National Institute of Malaria Research (ICMR-NIMR), Delhi, IND
| | - Byoung-Kuk Na
- Parasitology and Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju, KOR
| | - Ho-Joon Shin
- Tropical Infectious Disease Cooperation Laboraory, Ajou University School of Medicine, Suwon, KOR
| | - Dibakar Sahu
- Pulmonology Department, All India Institute of Medical Sciences, Raipur, IND
| | - Sajal De
- Pulmonology Department, All India Institute of Medical Sciences, Raipur, IND
| | - Soumyananda Chakraborti
- Parasite-Host Biology, Indian Council of Medical Research-National Institute of Malaria Research (ICMR-NIMR), Delhi, IND.,Biological Sciences, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, IND
| | - Kailash C Pandey
- Parasite-Host Biology, Indian Council of Medical Research-National Institute of Malaria Research (ICMR-NIMR), Delhi, IND.,Biological Sciences, Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, IND
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10
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Rak A, Gorbunov N, Kostevich V, Sokolov A, Prokopenko P, Rudenko L, Isakova-Sivak I. Assessment of Immunogenic and Antigenic Properties of Recombinant Nucleocapsid Proteins of Five SARS-CoV-2 Variants in a Mouse Model. Viruses 2023; 15:230. [PMID: 36680269 PMCID: PMC9861333 DOI: 10.3390/v15010230] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/17/2023] Open
Abstract
COVID-19 cases caused by new variants of highly mutable SARS-CoV-2 continue to be identified worldwide. Effective control of the spread of new variants can be achieved through targeting of conserved viral epitopes. In this regard, the SARS-CoV-2 nucleocapsid (N) protein, which is much more conserved than the evolutionarily influenced spike protein (S), is a suitable antigen. The recombinant N protein can be considered not only as a screening antigen but also as a basis for the development of next-generation COVID-19 vaccines, but little is known about induction of antibodies against the N protein via different SARS-CoV-2 variants. In addition, it is important to understand how antibodies produced against the antigen of one variant can react with the N proteins of other variants. Here, we used recombinant N proteins from five SARS-CoV-2 strains to investigate their immunogenicity and antigenicity in a mouse model and to obtain and characterize a panel of hybridoma-derived monoclonal anti-N antibodies. We also analyzed the variable epitopes of the N protein that are potentially involved in differential recognition of antiviral antibodies. These results will further deepen our knowledge of the cross-reactivity of the humoral immune response in COVID-19.
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Affiliation(s)
- Alexandra Rak
- Department of Virology, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Nikolay Gorbunov
- Department of Molecular Genetics, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Valeria Kostevich
- Department of Molecular Genetics, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Alexey Sokolov
- Department of Molecular Genetics, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Polina Prokopenko
- Department of Virology, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Larisa Rudenko
- Department of Virology, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
| | - Irina Isakova-Sivak
- Department of Virology, Institute of Experimental Medicine, Saint Petersburg 197022, Russia
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11
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Kim J, Kim D, Baek K, Kim M, Kang BM, Maharjan S, Park S, Choi JK, Kim S, Kim YK, Park MS, Lee Y, Kwon HJ. Production of a Monoclonal Antibody to the Nucleocapsid Protein of SARS-CoV-2 and Its Application to ELISA-Based Detection Methods with Broad Specificity by Combined Use of Detector Antibodies. Viruses 2022; 15:28. [PMID: 36680068 PMCID: PMC9866944 DOI: 10.3390/v15010028] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 12/12/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
The coronavirus disease 2019 pandemic, elicited by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is ongoing. Currently accessible antigen-detecting rapid diagnostic tests are limited by their low sensitivity and detection efficacy due to evolution of SARS-CoV-2 variants. Here, we produced and characterized an anti-SARS-CoV-2 nucleocapsid (N) protein-specific monoclonal antibody (mAb), 2A7H9. Monoclonal antibody 2A7H9 and a previously developed mAb, 1G10C4, have different specificities. The 2A7H9 mAb detected the N protein of S clade, delta, iota, and mu but not omicron, whereas the 1G10C4 antibody recognized the N protein of all variants under study. In a sandwich enzyme-linked immunosorbent assay, recombinant N protein bound to the 1G10C4 mAb could be detected by both 1G10C4 and 2A7H9 mAbs. Similarly, N protein bound to the 2A7H9 mAb was detected by both mAbs, confirming the existence of dimeric N protein. While the 1G10C4 mAb detected omicron and mu with higher efficiency than S clade, delta, and iota, the 2A7H9 mAb efficiently detected all the strains except omicron, with higher affinity to S clade and mu than others. Combined use of 1G10C4 and 2A7H9 mAb resulted in the detection of all the strains with considerable sensitivity, suggesting that antibody combinations can improve the simultaneous detection of virus variants. Therefore, our findings provide insights into the development and improvement of diagnostic tools with broader specificity and higher sensitivity to detect rapidly evolving SARS-CoV-2 variants.
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Affiliation(s)
- Jinsoo Kim
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Dongbum Kim
- Institute of Medical Science, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Kyeongbin Baek
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Minyoung Kim
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Bo Min Kang
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Sony Maharjan
- Institute of Medical Science, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Sangkyu Park
- Department of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Jun-Kyu Choi
- Department of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Suyeon Kim
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
| | - Yong Kyun Kim
- Division of Infectious Diseases, Department of Internal Medicine, Hallym University Sacred Heart Hospital, College of Medicine, Hallym University, Anyang 14068, Republic of Korea
| | - Man-Seong Park
- Department of Microbiology, College of Medicine, and the Institute for Viral Diseases, Korea University, Seoul 02841, Republic of Korea
| | - Younghee Lee
- Department of Biochemistry, College of Natural Sciences, Chungbuk National University, Cheongju 28644, Republic of Korea
| | - Hyung-Joo Kwon
- Department of Microbiology, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
- Institute of Medical Science, College of Medicine, Hallym University, Chuncheon 24252, Republic of Korea
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Ultrasensitive monitoring of SARS-CoV-2-specific antibody responses based on a digital approach reveals one week of IgG seroconversion. Biosens Bioelectron 2022; 217:114710. [PMID: 36174360 PMCID: PMC9476360 DOI: 10.1016/j.bios.2022.114710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/11/2022] [Accepted: 09/06/2022] [Indexed: 12/04/2022]
Abstract
COVID-19 is still unfolding, while many people have been vaccinated. In comparison to nucleic acid testing (NAT), antibody-based immunoassays are faster and more convenient. However, its application has been hampered by its lower sensitivity and the existing fact that by traditional immunoassays, the measurable seroconversion time of pathogen-specific antibodies, such as IgM or IgG, lags far behind that of nucleic acids. Herein, by combining the single molecule array platform (Simoa), RBD, and a previously identified SARS-CoV-2 S2 protein derivatized 12-aa peptide (S2-78), we developed and optimized an ultrasensitive assay (UIM-COVID-19 assay). Sera collected from three sources were tested, i.e., convalescents, inactivated virus vaccine-immunized donors and wild-type authentic SARS-CoV-2-infected rhesus monkeys. The sensitivities of UIM-COVID-19 assays are 100–10,000 times higher than those of conventional flow cytometry, which is a relatively sensitive detection method at present. For the established UIM-COVID-19 assay using RBD as a probe, the IgG and IgM seroconversion times after vaccination were 7.5 and 8.6 days vs. 21.4 and 24 days for the flow cytometry assay, respectively. In addition, using S2-78 as a probe, the UIM-COVID-19 assay could differentiate COVID-19 patients (convalescents) from healthy people and patients with other diseases, with AUCs ranging from 0.85–0.95. In summary, the UIM-COVID-19 we developed here is a promising ultrasensitive biodetection strategy that has the potential to be applied for both immunological studies and diagnostics.
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Zhou B, Cheng L, Song S, Guo H, Shen S, Wang H, Ge X, Liu L, Ju B, Zhang Z. Identification and application of a pair of noncompeting monoclonal antibodies broadly binding to the nucleocapsid proteins of SARS-CoV-2 variants including Omicron. Virol J 2022; 19:96. [PMID: 35643510 PMCID: PMC9142731 DOI: 10.1186/s12985-022-01827-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/03/2022] [Indexed: 12/21/2022] Open
Abstract
AbstractThe SARS-CoV-2 nucleocapsid protein (NP) is an important indicator for the virus infection, highlighting the crucial role of NP-specific monoclonal antibodies (mAbs) used in multiple biochemical assays and clinical diagnosis for detecting the NP antigen. Here, we reported a pair of noncompeting human NP-specific mAbs, named P301-F7 and P301-H5, targeting two distinct linear epitopes on SARS-CoV-2 or SARS-CoV. We evaluated the application of P301-F7 in the analysis of enzyme linked immunosorbent assay, western blot, flow cytometry, immunofluorescence, and focus reduction neutralization test. We for the first time report a broad mAb effectively recognizing various live viruses of SARS-CoV-2 variants including Alpha, Beta, Delta, and Omicron, indicating a wide range of application prospects.
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