| Autor: |
Takeshi Inoue, Ryo Shinnakasu, Chie Kawai, Hiromi Yamamoto, Shuhei Sakakibara, Chikako Ono, Yumi Itoh, Tommy Terooatea, Kazuo Yamashita, Toru Okamoto, Noritaka Hashii, Akiko Ishii-Watabe, Noah S. Butler, Yoshiharu Matsuura, Hisatake Matsumoto, Shinya Otsuka, Kei Hiraoka, Takanori Teshima, Masaaki Murakami, Tomohiro Kurosaki |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
The Journal of experimental medicine. 220(2) |
| ISSN: |
1540-9538 |
| Popis: |
In contrast to a second dose of the SARS-CoV-2 mRNA vaccine, a third dose elicits potent neutralizing activity against the Omicron variant. To address the underlying mechanism for this differential antibody response, we examined spike receptor-binding domain (RBD)–specific memory B cells in vaccinated individuals. Frequency of Omicron-reactive memory B cells increased ∼9 mo after the second vaccine dose. These memory B cells show an altered distribution of epitopes from pre-second memory B cells, presumably due to an antibody feedback mechanism. This hypothesis was tested using mouse models, showing that an addition or a depletion of RBD-induced serum antibodies results in a concomitant increase or decrease, respectively, of Omicron-reactive germinal center (GC) and memory B cells. Our data suggest that pre-generated antibodies modulate the selection of GC and subsequent memory B cells after the second vaccine dose, accumulating more Omicron-reactive memory B cells over time, which contributes to the generation of Omicron-neutralizing antibodies elicited by the third vaccine dose. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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