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Vasconcelos LDCM, Leony LM, Camelier AA, Meireles AC, Oliveira Júnior ALFD, Bandeira AC, Macedo YSF, Duarte AO, Van Voorhis W, Siqueira ICD, Santos FLN. Usefulness of receptor binding domain protein-based serodiagnosis of COVID-19. IJID REGIONS 2024; 10:1-8. [PMID: 38045864 PMCID: PMC10687696 DOI: 10.1016/j.ijregi.2023.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 10/31/2023] [Accepted: 11/05/2023] [Indexed: 12/05/2023]
Abstract
Objectives This study evaluated the performance of recombinant receptor binding domain (RBD) protein-based enzyme-linked immunosorbent assays (RBD-ELISAs) for detecting anti-SARS-CoV-2 immunoglobulin (Ig) G and IgM antibodies. Methods In this study, 705 sera from SARS-CoV-2-infected individuals and 315 sera from healthy individuals were analyzed. Results The RBD-ELISA IgG exhibited high specificity (99.1%) and moderate sensitivity (48.0%), with an overall diagnostic accuracy of 73.5%. RBD-ELISA IgM demonstrated specificity at 94.6% and sensitivity at 51.1%, with an accuracy of 72.8%. Both assays displayed improved performance when analyzing samples collected 15-21 days post-symptom onset, achieving sensitivity and accuracy exceeding 88% and 90%, respectively. Combining RBD-ELISA IgG and IgM in parallel analysis enhanced sensitivity to 98.6% and accuracy to 96.2%. Comparing these RBD-ELISAs with commercially available tests, the study found overlapping sensitivity and similar specificity values. Notably, the combined RBD-ELISA IgG and IgM showed superior performance. Cross-reactivity analysis revealed low false-positive rates (4.4% for IgG, 3.7% for IgM), primarily with viral infections. Conclusion This research underscores the potential of RBD-based ELISAs for COVID-19 diagnosis, especially when assessing samples collected 15-21 days post-symptom onset and utilizing a parallel testing approach. The RBD protein's immunogenicity and specificity make it a valuable tool for serodiagnosis, offering an alternative to polymerase chain reaction-based methods, particularly in resource-limited settings.
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Affiliation(s)
| | - Leonardo Maia Leony
- Advanced Public Health Laboratory, Gonçalo Moniz Institute (IGM), Oswaldo Cruz Foundation (FIOCRUZ-RJ), Salvador, Brazil
| | - Aquiles Assunção Camelier
- Aliança D'Or Hospital, Salvador, Brazil
- Bahia School of Medicine and Public Health, Salvador, Brazil
- State University of Bahia, Salvador, Brazil
| | | | | | | | - Yasmin Santos Freitas Macedo
- Laboratory of Experimental Pathology, Institute Gonçalo Moniz, Oswaldo Cruz Foundation (FIOCRUZ-BA), Salvador, Brazil
| | - Alan Oliveira Duarte
- Laboratory of Experimental Pathology, Institute Gonçalo Moniz, Oswaldo Cruz Foundation (FIOCRUZ-BA), Salvador, Brazil
| | | | - Isadora Cristina de Siqueira
- Laboratory of Experimental Pathology, Institute Gonçalo Moniz, Oswaldo Cruz Foundation (FIOCRUZ-BA), Salvador, Brazil
- Integrated Translational Program in Chagas Disease from FIOCRUZ (Fio-Chagas), Oswaldo Cruz Foundation (FIOCRUZ-RJ), Rio de Janeiro, Brazil
| | - Fred Luciano Neves Santos
- Advanced Public Health Laboratory, Gonçalo Moniz Institute (IGM), Oswaldo Cruz Foundation (FIOCRUZ-RJ), Salvador, Brazil
- Integrated Translational Program in Chagas Disease from FIOCRUZ (Fio-Chagas), Oswaldo Cruz Foundation (FIOCRUZ-RJ), Rio de Janeiro, Brazil
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Cervantes-Torres J, Cabello-Gutiérrez C, Ayón-Núñez DA, Soldevila G, Olguin-Alor R, Diaz G, Acero G, Segura-Velázquez R, Huerta L, Gracia-Mora I, Cobos L, Pérez-Tapia M, Almagro JC, Suárez-Güemes F, Bobes RJ, Fragoso G, Sciutto E, Laclette JP. Caveats of chimpanzee ChAdOx1 adenovirus-vectored vaccines to boost anti-SARS-CoV-2 protective immunity in mice. Appl Microbiol Biotechnol 2024; 108:179. [PMID: 38280035 PMCID: PMC10821985 DOI: 10.1007/s00253-023-12927-0] [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: 08/07/2023] [Revised: 11/21/2023] [Accepted: 11/26/2023] [Indexed: 01/29/2024]
Abstract
Several COVID-19 vaccines use adenovirus vectors to deliver the SARS-CoV-2 spike (S) protein. Immunization with these vaccines promotes immunity against the S protein, but against also the adenovirus itself. This could interfere with the entry of the vaccine into the cell, reducing its efficacy. Herein, we evaluate the efficiency of an adenovirus-vectored vaccine (chimpanzee ChAdOx1 adenovirus, AZD1222) in boosting the specific immunity compared to that induced by a recombinant receptor-binding domain (RBD)-based vaccine without viral vector. Mice immunized with the AZD1222 human vaccine were given a booster 6 months later, with either the homologous vaccine or a recombinant vaccine based on RBD of the delta variant, which was prevalent at the start of this study. A significant increase in anti-RBD antibody levels was observed in rRBD-boosted mice (31-61%) compared to those receiving two doses of AZD1222 (0%). Significantly higher rates of PepMix™- or RBD-elicited proliferation were also observed in IFNγ-producing CD4 and CD8 cells from mice boosted with one or two doses of RBD, respectively. The lower efficiency of the ChAdOx1-S vaccine in boosting specific immunity could be the result of a pre-existing anti-vector immunity, induced by increased levels of anti-adenovirus antibodies found both in mice and humans. Taken together, these results point to the importance of avoiding the recurrent use of the same adenovirus vector in individuals with immunity and memory against them. It also illustrates the disadvantages of ChAdOx1 adenovirus-vectored vaccine with respect to recombinant protein vaccines, which can be used without restriction in vaccine-booster programs. KEY POINTS: • ChAdOx1 adenovirus vaccine (AZD1222) may not be effective in boosting anti-SARS-CoV-2 immunity • A recombinant RBD protein vaccine is effective in boosting anti-SARS-CoV-2 immunity in mice • Antibodies elicited by the rRBD-delta vaccine persisted for up to 3 months in mice.
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Affiliation(s)
- Jacquelynne Cervantes-Torres
- School of Veterinary Medicine, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Carlos Cabello-Gutiérrez
- Instituto Nacional de Enfermedades Respiratorias "Ismael Cosío Villegas", Calzada de Tlalpan 4502, Belisario Domínguez Secc. 16, Tlalpan, 14080, Mexico City, CDMX, Mexico
| | - Dolores-Adriana Ayón-Núñez
- School of Veterinary Medicine, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Gloria Soldevila
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
- Laboratorio Nacional de Citometría de Flujo, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Roxana Olguin-Alor
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
- Laboratorio Nacional de Citometría de Flujo, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Georgina Diaz
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Gonzalo Acero
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - René Segura-Velázquez
- School of Veterinary Medicine, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Leonor Huerta
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Isabel Gracia-Mora
- Unidad de Experimentación Preclínica, Facultad de Química, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Laura Cobos
- School of Veterinary Medicine, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Mayra Pérez-Tapia
- Unidad de Desarrollo e Investigación en Bioterapeúticos (UDIBI), Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340, Mexico City, Mexico
| | - Juan C Almagro
- Unidad de Desarrollo e Investigación en Bioterapeúticos (UDIBI), Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, 11340, Mexico City, Mexico
| | - Francisco Suárez-Güemes
- School of Veterinary Medicine, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Raúl J Bobes
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Gladis Fragoso
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico
| | - Edda Sciutto
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico.
| | - Juan Pedro Laclette
- Biomedical Research Institute, Universidad Nacional Autónoma de México, Coyoacán, 04510, Mexico City, Mexico.
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Rodríguez MC, Ceaglio N, Gugliotta A, Villarraza J, Garay E, Fuselli A, Gastaldi V, Tardivo MB, Antuña S, Fontana D, Prieto C. Design and optimization of an IgG human ELISA assay reactive to recombinant RBD SARS-CoV-2 protein. Appl Microbiol Biotechnol 2022; 106:7933-7948. [DOI: 10.1007/s00253-022-12254-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 10/17/2022] [Accepted: 10/23/2022] [Indexed: 11/06/2022]
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Cross-Reactivity of SARS-CoV-2 Nucleocapsid-Binding Antibodies and Its Implication for COVID-19 Serology Tests. Viruses 2022; 14:v14092041. [PMID: 36146847 PMCID: PMC9502088 DOI: 10.3390/v14092041] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 09/09/2022] [Accepted: 09/12/2022] [Indexed: 11/17/2022] Open
Abstract
The emergence of the new coronavirus SARS-CoV-2 in late 2019 led to the global pandemic COVID-19, causing a profound socioeconomic crisis. Adequate diagnostic tools need to be developed to control the ongoing spread of infection. Virus-specific humoral immunity in COVID-19 patients and those vaccinated with specific vaccines has been characterized in numerous studies, mainly using Spike protein-based serology tests. However, Spike protein and specifically its receptor-binding domain (RBD) are mutation-prone, suggesting the reduced sensitivity of the validated serology tests in detecting antibodies raised to variants of concern (VOC). The viral nucleocapsid (N) protein is more conserved compared to Spike, but little is known about cross-reactivity of the N-specific antibodies between the ancestral B.1 virus and different VOCs. Here, we generated recombinant N phosphoproteins from different SARS-CoV-2 strains and analyzed the magnitude of N-specific antibodies in COVID-19 convalescent sera using an in-house N-based ELISA test system. We found a strong positive correlation in the magnitude of anti-N (B.1) antibodies and antibodies specific to various VOCs in COVID-19-recovered patients, suggesting that the N-binding antibodies are highly cross-reactive, and the most immunogenic epitopes within this protein are not under selective pressure. Overall, our study suggests that the RBD-based serology tests should be timely updated to reflect the constantly evolving nature of the SARS-CoV-2 Spike protein, whereas the validated N-based test systems can be used for the analysis of sera from COVID-19 patients regardless of the strain that caused the infection.
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