Functional Antibodies Against SARS-CoV-2 Receptor Binding Domain Variants with Mutations N501Y or E484K in Human Milk from COVID-19-Vaccinated, -Recovered, and -Unvaccinated Women

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Demers-Mathieu, VeroniqueMedolac Laboratories, A Public Benefit Corporation (author)

Functional Antibodies Against SARS-CoV-2 Receptor Binding Domain Variants with Mutations N501Y or E484K in Human Milk from COVID-19-Vaccinated, -Recovered, and -Unvaccinated Women

Article/chapterEnglish2022

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Mary Ann Liebert Inc,2022

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LIBRIS-ID:oai:lup.lub.lu.se:e8d2926a-21cd-401f-91df-9780b20bf4cd
https://lup.lub.lu.se/record/e8d2926a-21cd-401f-91df-9780b20bf4cdURI
https://doi.org/10.1089/bfm.2021.0232DOI

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Language:English
Summary in:English

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Background: New variants are evolving in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and receptor binding domain (RBD) mutations have been associated with a higher capacity to evade neutralizing antibodies (NAbs). We aimed at determining the impact of COVID-19 vaccine and infection on human milk antibody titers and activity against the RBD mutations from SARS-CoV-2 variants of concern. Materials and Methods: Milk samples were collected from 19 COVID-19 vaccinated women, 10 women who had a positive COVID-19 PCR test, and 13 unvaccinated women. The titers and NAbs of secretory IgA (SIgA)/IgA, secretory IgM (IgM)/IgM, and IgG against SARS-CoV-2 RBD with mutations N501Y or E484K were measured by using ELISA and a surrogate virus neutralization assay. Results: The titers of human milk IgG against N501Y were higher in the COVID-19 vaccine group than in the no-vaccine group but comparable with the COVID-19 PCR group. Other antibody titers did not differ between the three groups. The titers of SIgA/IgA were higher than those of SIgM/IgM and IgG in all three groups. The titers of SIgM/IgM and the inhibition of NAbs were higher against the mutation E484K than N501Y. Milk NAb did not differ between the three groups, but the inhibition of NAb against binding of the two mutant RBD proteins to their receptor was higher in the COVID-19 vaccine and PCR groups than in milk from prepandemic women. Conclusions: COVID-19 vaccination and exposure of mothers to SARS-CoV-2 influenced the titers and NAbs in breast milk against the variants of concern.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Infektionsmedicin hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Infectious Medicine hsv//eng
SARS-CoV-2
COVID-19
breastfeeding
human milk
antibody

Added entries (persons, corporate bodies, meetings, titles ...)

Hakansson, Anders PLund University,Lunds universitet,Experimentell infektionsmedicin, Malmö,Forskargrupper vid Lunds universitet,SEBRA Sepsis and Bacterial Resistance Alliance,Experimental Infection Medicine, Malmö,Lund University Research Groups(Swepub:lu)med-a1h (author)
Hall, StephanieMedolac Laboratories, A Public Benefit Corporation (author)
Lavangnananda, SirimaMedolac Laboratories, A Public Benefit Corporation (author)
Fels, ShawnMedolac Laboratories, A Public Benefit Corporation (author)
Medo, ElenaMedolac Laboratories, A Public Benefit Corporation (author)
Medolac Laboratories, A Public Benefit CorporationExperimentell infektionsmedicin, Malmö (creator_code:org_t)

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In:Breastfeeding Medicine: Mary Ann Liebert Inc17:2, s. 163-1721556-82531556-8342

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