低剂量mRNA-1273 COVID-19疫苗通过交叉反应性T细胞增强持久记忆力
Jose Mateus1, Jennifer M Dan1,2, Zeli Zhang1
1Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology (LJI), La Jolla, CA 92037, USA.
莫德纳mRNA-1273疫苗产生强大的CD4+T细胞,CD8+T细胞和抗体反应. 已存在的T细胞记忆可以增强疫苗免疫力和抗体产生对抗SARS-CoV-2.
科学领域:
- 免疫学
- 疫苗学
- 病毒学
背景情况:
- 对于了解抗病毒感染的长期保护,mRNA疫苗的免疫性至关重要.
- 对不同年龄组的疫苗反应进行评估,并考虑先前存在的免疫力对于公共卫生战略至关重要.
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 感染可以诱导T细胞记忆,这可能会影响随后的疫苗疗效.
研究的目的:
- 在接种Moderna mRNA-1273疫苗七个月后,评估疫苗特异性免疫反应,包括T细胞和抗体水平.
- 将疫苗诱导的免疫记忆与COVID-19病例中的自然感染进行比较.
- 研究先前存在的T细胞交叉反应记忆对疫苗产生的免疫力的影响.
主要方法:
- 对CD4+ T细胞,CD8+ T细胞,结合抗体和中和抗体反应进行纵向分析.
- 在多个年龄组中评估疫苗反应.
- 接种疫苗的人与康复者之间的免疫记忆标记 (例如,T毛囊辅助细胞,干扰素-γ表达) 的比较.
主要成果:
- 在接种疫苗后六个月,疫苗产生的高峰特异性CD4+ T细胞在数量和质量上与COVID-19感染后观察到的细胞相似.
- 在88%的受试者中产生了尖端特异性的CD8+ T细胞,在增强后的六个月内,记忆水平与COVID-19病例相似.
- 具有先前交叉反应性CD4+T细胞记忆的个体表现出增强的CD4+T细胞和抗体对疫苗的反应.
结论:
- 莫德纳mRNA-1273疫苗诱导了耐用且可比的T细胞和抗体记忆力,以应对自然的SARS-CoV-2感染.
- 预先存在的交叉反应性CD4+T细胞记忆在提高疫苗免疫性方面发挥着重要作用.
- 这些发现突显了T细胞记忆在疫苗疗效中的重要性,并强调了mRNA疫苗在不同人群中的潜在益处.
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