前ChAdOx1 COVID-19免疫接种对T细胞对ChAdOx1-HBV的反应的影响
Charlotte Davis1, Dave Singh2, Katie Anderson1
1Barinthus Biotherapeutics, Harwell, Didcot OX11 0DF, UK.
Vaccines
|June 27, 2024
概括
之前的ChAdOx1-SARS-CoV2疫苗接种减少了T细胞对随后的ChAdOx1-HBV疫苗的早期反应. 腺病毒载体免疫接种之间的较长间隔可能会改善T细胞对异种抗原的反应.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 病毒载体疫苗 病毒载体疫苗
背景情况:
- 以前接触病毒载体可能会影响随后的免疫反应.
- 关于抗载体免疫对T细胞对具有异质插入的载体疫苗反应的影响的数据是可变的.
研究的目的:
- 调查之前的ChAdOx1-SARS-CoV2疫苗是否会影响T细胞对随后的ChAdOx1-HBV疫苗的反应.
- 评估抗载体免疫对异质抗原特异性T细胞反应的影响.
主要方法:
- 在Vaxzevria (ChAdOx1-SARS-CoV2) 或mRNA COVID-19疫苗接种10-18周后,健康的志愿者接种了ChAdOx1-HBV疫苗.
- 测量了抗ChAdOx1中和抗体标位.
- 用ELISpot和细胞内细胞因子染色 (ICS) 通过多参数流细胞计来评估载体和插入特异性T细胞反应.
主要成果:
- 与mRNA队列相比,在Vaxzevria队列中观察到更高的抗ChAdOx1基线标位.
- 对HBV抗原的T细胞反应最初在mRNA组较高,但在第84天变得相似.
- ICS测定显示T细胞响应在最终时间点的持续差异.
结论:
- 在3个月内使用相同病毒载体脊柱疫苗接种对插入特异性T细胞反应产生影响.
- 在先前的腺病毒载体免疫接种后的较长时间间隔可能有利于引起强大的T细胞对异质抗原的反应.
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