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Mタンパク質変異による弱体化された再結合性膀炎ウイルスベクトルを用いたCOVID-19ワクチン候補の開発

Mengqi Chang^1,2, Hui Huang^1,2, Mingxi Yue^1,2

¹State Key Laboratory of Vaccines for Infectious Diseases, Xiang An Biomedicine Laboratory, School of Public Health, Xiamen University, Xiamen 361102, China.

|August 28, 2025

まとめ

再複合性膀炎ウイルス (rVSV) のMタンパク質変異により,より安全で効果的なCOVID-19粘膜ワクチンが作られます. これらの弱化したrVSVベクターは,臨床前モデルにおいて安全性の向上と強い免疫性を示しています.

科学分野:

ウイルス学
ワクチン学
免疫学

背景:

リコンビネント膀炎ウイルス (rVSV) は,COVID-19の潜在的なワクチンベクターです.
粘膜免疫のための鼻内投与は,高い安全基準を必要とします.
rVSVのMタンパク質は衰弱の標的である.

研究の目的:

COVID-19 粘膜ワクチンのための弱化した rVSV ベクターを開発する.
Mタンパク質に変異したrVSVの安全性と免疫性を評価する.

主な方法:

Mタンパク質変異を持つrVSV変種 (rVSV-M2,rVSV-M4) を構築した.
評価されたウイルスの複製,in vitroとin vivoの衰弱.
野生型および変異型rVSVの背骨を用いたSARS-CoV-2ワクチン候補を開発した.
ハムスターモデルでのワクチンの免疫性および安全性を評価した.

主要な成果:

Mタンパク質の変異 (rVSV-M2,rVSV-M4) は,rVSVを in vitro と in vivo で著しく弱めた.
弱体化されたウイルスは,より強いタイプIインターフェロン反応を誘発し,炎症を減少させた.
rVSV- M2- JN. 1およびrVSV- M4- JN. 1ワクチンは,ハムスターにおいて安全性と強い免疫性を示した.

結論:

rVSVのMタンパク質変異は,粘膜ワクチンの有望な弱化したベクターである.
これらのミュータントは,COVID-19ワクチンの開発のための免疫原性を維持しながら,安全性を高めます.

キーワード:

SARS-CoV-2について生体弱化ワクチン粘膜免疫膀性口炎ウイルス

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