The avidity of virus-specific antibodies obtained from in vitro stimulated memory b cells does not change one month after booster with Sputnik V or Comirnaty

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Abstract

The protective properties of long-term immunological memory after vaccination against COVID-19 are characterized by the neutralizing activity of serum antibodies and antibodies secreted by memory B cells upon repeated encounter with the antigen. Somatic hypermutations occurring in the immunoglobulin genes of memory B cells are one of the mechanisms for increasing the affinity of antibodies. At the moment, the effect of booster vaccination against COVID-19 with vector vaccines, on the maturation of memory B cells remains poorly understood. The purpose of this work was to determine how COVID-19 booster affects the affinity of RBD-specific IgG antibodies secreted by memory B cells. B lymphocytes were isolated from peripheral mononuclear blood cells of volunteers who had been revaccinated against COVID-19 with Sputnik V or Comirnaty. B cells were stimulated in vitro with CD40L expressed on the surface of A549 feeder cells and IL-21. Supernatants were concentrated 8-fold using centrifugal concentrators. In the obtained supernatants from stimulated memory B cells, the level of IgG antibodies specific to wild-type RBD was determined by enzyme-linked immunosorbent assay (ELISA). To determine the avidity index, ELISA with 7M urea was provided. It was shown that despite a general increase in the amount of antigen-specific IgG antibodies obtained from stimulated memory B cells, there was no change in the avidity of these antibodies one month after booster in both groups of donors. The obtained results contribute to the understanding of the mechanisms of memory B cell maturation after booster vaccinations against COVID-19 and may be useful for deciding on the strategy of booster vaccination.

About the authors

Ekaterina A. Astakhova

National Research Center Institute of Immunology, Federal Medical Biological Agency of Russia; Lomonosov Moscow State University

Author for correspondence.
Email: ast_kat@mail.ru

Junior Researcher, PhD Student, Department of Immunology, Biology Faculty

Russian Federation, Moscow 115522; Moscow 119991

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2. Figure 1. Increase in the level of anti-RBD IgG antibodies in the supernatants of stimulated B lymphocytes after revaccination

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3. Figure 2. Change in avidity index of supernatants depending on urea concentration

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4. Figure 3. Avidity index of RBD-specific IgG antibodies in the supernatants of in vitro stimulated B lymphocytes after revaccination

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