mRNAワクチンに対するB細胞反応の生殖中心駆動成熟

Wooseob Kim¹, Julian Q Zhou¹, Stephen C Horvath¹

¹Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA.

Nature

|February 15, 2022

まとめ

SARS-CoV-2 mRNA ワクチン接種は,長期間続く生殖中心の反応を誘発し,ワクチン接種後6ヶ月間,ウイルスを中和させる非常に効果的な,親和性成熟した抗体につながります.

科学分野:

免疫学
ワクチン学
分子生物学

背景:

ゲルミナルセンター (GC) は,記憶B細胞 (MBCs) と長寿骨髄プラズマ細胞 (BMPCs) を生成するB細胞の親和性成熟に不可欠です.
SARS-CoV-2 mRNAワクチン接種は,少なくとも6ヶ月持続するヒトのGC反応を誘発する.
ワクチン接種後のGCB細胞の長期的命運と機能的影響は不明である.

研究の目的:

mRNAワクチン接種後のSARS-CoV-2スペイク特有のB細胞クローンの進化と機能的結果を調査する.
SARS-CoV-2 mRNAワクチン接種によって生成されたメモリB細胞とプラズマ細胞の特徴を決定する.
抗体アビディティと中和能力に対する体性高変異の蓄積の影響を評価する.

主な方法:

血のプラズマブラスト,MBC,リンパ節のGCB細胞,BMPCからのB細胞受容体の配列決定
BMPCクローンから派生したモノクローン抗体の発現と特徴づけ
ソマティック・ハイパーミューテーション (SHM) 頻度と抗体アビデンス測定の定量化.

主要な成果:

SARS-CoV-2 mRNAワクチン接種は,GC B細胞のSHM頻度が6ヶ月間にわたって増加する持続的なGC反応を誘発した.
スパイク特有のMBCsとBMPCsは,抗体アビディティの強化と相関する,有意なSHMを蓄積した.
BMPCからのモノクローナル抗体は,SARS-CoV-2に対する親和性と強力な中和能力を示した.

結論:

SARS-CoV-2 mRNAワクチン接種の後の持続的なGC反応は,親和性と中和性の強化による長期の抗体反応につながります.
この研究は,抗体反応の成熟過程を明らかにし,持続的なウイルス保護に不可欠である.
この発見は,mRNAワクチンによる持続的な免疫の効果を強調しています.

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