ワクチン接種後1年以内にヒトの骨髄プラズマ細胞の減少

Carl W Davis^1,2, Katherine J L Jackson³, Megan M McCausland^1,2

¹Emory Vaccine Center and Department of Microbiology and Immunology, Emory University, Atlanta, GA, USA.

Science (New York, N.Y.)

|August 15, 2020

まとめ

インフルエンザワクチンは,成人における短命の骨髄血細胞 (BMPC) を生成します. BMPCの長寿を高めることは,次世代の普遍的なインフルエンザワクチンの開発に不可欠です.

科学分野:

免疫学
ワクチン学
ウイルス学

背景:

効果的なインフルエンザワクチンには,長期間続く免疫反応が不可欠です.
骨髄プラズマ細胞 (BMPC) は,血清の抗体レベルを長期的に維持するために重要です.
現在のインフルエンザワクチンは幅広い反応性と耐久性を目指していますが,長期的な有効性は依然として課題です.

研究の目的:

ワクチン接種後のインフルエンザ特有のBMPCの生成と維持を調査する.
季節性無活性化インフルエンザワクチンによって生成されたBMPCの長寿を測定する.
インフルエンザ特有のBMPCの減少に寄与する要因を特定する.

主な方法:

成人参加者は季節性無活性インフルエンザワクチンを接種した.
インフルエンザに特異的なBMPCは,ワクチン接種後の様々な時間点 (例えば4週間,1年) で骨髄サンプルで定量化されました.
分析は,ワクチンによるBMPCと,既存のBMPCの動態に焦点を当てた.

主要な成果:

ワクチン接種後4週間で,インフルエンザ特有のBMPCの有意な増加が観察されました.
ワクチン接種後1年後には,BMPC数はワクチン接種前のレベルに近い状態に戻った.
BMPCの数が減少したのは,ワクチンによって引き起こされた細胞の喪失であり,既存のBMPCは維持された.

結論:

現行のワクチンによって成人に生成されるインフルエンザ特有のBMPCのほとんどは,短命である.
BMPCの持続性は,長期的な免疫を達成するための重要な要因です.
将来のインフルエンザワクチンの設計には,BMPCの長寿を高める戦略を組み込む必要があります.

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