免疫球蛋白替代产品在体内保护SARS-CoV-2感染,尽管中和活性较差
Ofer Zimmerman1, Alexa Michelle Altman Doss2, Baoling Ying1
1Department of Medicine, and.
JCI insight
|January 4, 2024
概括
疫情前的免疫球蛋白 (IG) 产品缺乏SARS-CoV-2活性. 流行后IG显示中和活性增加,IG预防保护小鼠免受COVID-19变体的侵害,这表明Fc效应器功能是免疫缺陷患者的关键.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 药理学 药理学是指药理学的学科.
背景情况:
- 免疫球蛋白 (IG) 替代疗法对于需要被动免疫的免疫缺陷患者至关重要.
- 此前,IG对SARS-CoV-2变种的疗效,特别是其中和和保护作用,是未知的.
研究的目的:
- 评估IG产品对SARS-CoV-2及其变种的交叉反应性,中和活性和保护能力.
- 研究IG在不断变化的病毒菌株背景下给予保护的机制.
主要方法:
- 测试了2019年12月至2022年8月期间制造的198种IG产品的SARS-CoV-2活性.
- 对SARS-CoV-2 WA1/2020 D614G.的评估抗抗体标位和中和活性.
- 在K18-hACE2-转基因小鼠中评估IG预防疗效,这些小鼠受到XBB.1.5Omicron变异的挑战.
主要成果:
- 疫情前IG显示没有显著的交叉反应性或对SARS-CoV-2的中和活性.
- 随着时间的推移,IG产品的抗尖峰抗体标位和中和活性增加,达到与接种疫苗的捐赠者相当的水平.
- 尽管循环变种 (XBB.1.5) 的中和程度有限,但IG预防保护小鼠免受严重疾病,肺部感染和炎症的影响.
结论:
- 即使对SARS-CoV-2变种的中和活性降低,IG替代产品也可能通过Fc效应函数保护免疫缺陷患者.
- 该研究强调了Fc效应机制在IG介导的病毒感染防护中的重要性.
- 研究结果表明,IG疗法对免疫缺陷患者仍然有价值,这些患者面临着像SARS-CoV-2这样不断变化的病毒威胁.
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