Cross-reactivity of neutralizing antibody and its correlation with circulating T follicular cells in recovered COVID-19 individuals
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Abstract
Seroconversion appeared early after COVID-19 onset, and convalescent sera therapy benefit some critical patients. However, neutralizing antibody (nAb) in convalescents is largely unknown. We found that 97.01% (65/67) of COVID-19 convalescents maintained IgG antibodies with high binding and avidity to SARS-CoV-2 spike subunits S1 and S2, and 95.52% (64/67) had neutralization activity against SARS-CoV-2 pesudovirus, one month after discharge (median ID 50 , 2.75; IQR, 2.34-3.08). Some sera exhibited cross-neutralization against SARS-CoV (76.12%), MERS-CoV (17.91%), or both (10.45%). Interestingly, individuals recovered from severe disease (severe group) had nAbs with binding and neutralization titers higher than non-severe group. Severe group appeared a rapid increase of lymphocytes and a high proportion of circulating CXCR3 + Tfh cells. Interestingly, the later were spike-specific and positively correlated with SARS-CoV-2 nAb titers. All subjects had no autoimmunity. Our findings provide novel insights into nAb responses in COVID-19 convalescents and facilitate treatment and vaccine development for SARS-CoV-2 infection.
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SciScore for 10.1101/2020.06.12.20129460: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Institutional Review Board Statement IRB: The study protocol was approved by the Institutional Review Board of The Center Hospital of Shaoyang (V1. 0, 20200301), Hunan Province, China.
Consent: Written informed consent was obtained from each participant.Randomization not detected. Blinding not detected. Power Analysis not detected. Sex as a biological variable not detected. Cell Line Authentication not detected. Table 2: Resources
Antibodies Sentences Resources Spike subunits S1- and S2-specific antibodies were detected by using horseradish peroxidase (HRP)-conjugated anti-human IgG and 3,3’,5,5’-tetramethylbenzidine substrate (Thermo Fisher Scientific, Waltham, MA, USA). S2-specificsuggested: Noneanti-human IgGs…SciScore for 10.1101/2020.06.12.20129460: (What is this?)
Please note, not all rigor criteria are appropriate for all manuscripts.
Table 1: Rigor
Institutional Review Board Statement IRB: The study protocol was approved by the Institutional Review Board of The Center Hospital of Shaoyang (V1. 0, 20200301), Hunan Province, China.
Consent: Written informed consent was obtained from each participant.Randomization not detected. Blinding not detected. Power Analysis not detected. Sex as a biological variable not detected. Cell Line Authentication not detected. Table 2: Resources
Antibodies Sentences Resources Spike subunits S1- and S2-specific antibodies were detected by using horseradish peroxidase (HRP)-conjugated anti-human IgG and 3,3’,5,5’-tetramethylbenzidine substrate (Thermo Fisher Scientific, Waltham, MA, USA). S2-specificsuggested: Noneanti-human IgGsuggested: NoneHealthy sera were used as negative controls, and monoclonal antibody specific for the receptor binding domain (RBD) of SARS-CoV-2 spike protein (anti-RBD/SARS-CoV-2; made in the lab, unpublished data) was used as positive control. anti-RBD/SARS-CoV-2suggested: NoneOf which, anti-dsDNA and anti-ANA antibodies were detected by ELISA (Zeus Scientific, Inc. New Jersey, USA), while anti-nucleosomes, histones, SmD1, U1-SnRNP, SS-A/Ro60KD, SS-A/Ro52 KD, SS-B/La, Sc1-70, CENP-B, Jo-1, and anti-PO/38KD were examined by Line Immuno Assay (LIA), according to the manufacturer’s protocols (HUMAN GmbH, Magdeburg, Germany). anti-dsDNAsuggested: Noneanti-ANAsuggested: (MyBioSource Cat# MBS702259, RRID:AB_10889535)Jo-1suggested: Noneanti-PO/38KDsuggested: NoneThe fluorescently labeled antibodies used in this study were BUV737 mouse anti-human CD4 (SK3) and PE mouse anti-human CXCR3 (1C6) (BD Biosciences), FITC mouse anti-human PD-1 (EH12.2H7) (BioLegend), and PE-eFluor 610 mouse anti-human CXCR5 (MU5UBEE) (Thermo Fisher Scientific, Waltham, MA, USA). anti-human CD4suggested: Noneanti-human CXCR3suggested: Noneanti-human PD-1suggested: Noneanti-human CXCR5suggested: NoneExperimental Models: Cell Lines Sentences Resources Naïve Huh7 cells were added to each well and incubated in 5% CO2 at 37°C for 24 hours. Huh7suggested: NoneSoftware and Algorithms Sentences Resources The luminescence was measured, and the ID50 values were calculated with non-linear regression, i.e. log (inhibitor) vs. response (four parameters), using GraphPad Prism 8 (GraphPad Software, Inc., San Diego, CA, USA). GraphPadsuggested: (GraphPad Prism, RRID:SCR_002798)The fluorescently labeled antibodies used in this study were BUV737 mouse anti-human CD4 (SK3) and PE mouse anti-human CXCR3 (1C6) (BD Biosciences), FITC mouse anti-human PD-1 (EH12.2H7) (BioLegend), and PE-eFluor 610 mouse anti-human CXCR5 (MU5UBEE) (Thermo Fisher Scientific, Waltham, MA, USA). BD Biosciencessuggested: (BD Biosciences, RRID:SCR_013311)All data were analyzed with FlowJo 10.0 software (Tree Star, San Carlos, CA, USA). FlowJosuggested: (FlowJo, RRID:SCR_008520)Analyses of the data were done by SPSS version 26 and GraphPad Prism version 8.0. SPSSsuggested: (SPSS, RRID:SCR_002865)GraphPad Prismsuggested: (GraphPad Prism, RRID:SCR_002798)Results from OddPub: We did not detect open data. We also did not detect open code. Researchers are encouraged to share open data when possible (see Nature blog).
Results from LimitationRecognizer: An explicit section about the limitations of the techniques employed in this study was not found. We encourage authors to address study limitations.Results from TrialIdentifier: No clinical trial numbers were referenced.
Results from Barzooka: We did not find any issues relating to the usage of bar graphs.
Results from JetFighter: We did not find any issues relating to colormaps.
Results from rtransparent:- Thank you for including a conflict of interest statement. Authors are encouraged to include this statement when submitting to a journal.
- Thank you for including a funding statement. Authors are encouraged to include this statement when submitting to a journal.
- No protocol registration statement was detected.
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