在ART中断之前提高SIV特定的CD8+T细胞反应,延长了SIVmac239反弹的时间
Were R Omange1, Benjamin D Varco-Merth1, Omo Fadeyi1
1Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, United States of America.
The Journal of clinical investigation
|January 29, 2026
概括
在中断抗逆转录病毒疗法 (ART) 之前,用mRNA疫苗增强CD8+T细胞延迟了人免疫缺陷病毒 (SIV) 在中的反弹. 然而,这种免疫增强并没有在治疗中断后提供长期的病毒控制.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 病毒学 病毒学
背景情况:
- CD8+ T细胞反应对于控制HIV/SIV等病毒感染至关重要.
- 抗逆转录病毒治疗 (ART) 的中断 (ATI) 通常会导致由于T细胞控制不足而导致病毒反弹.
- 在ATI中增强T细胞反应可能会改善对SIV感染重新激活的免疫拦截.
研究的目的:
- 确定在ATI之前通过mRNA疫苗接种增强SIV特异性CD8+T细胞是否可以改善SIV反弹的免疫控制.
- 评估编码SIV Gag,Nef和Pol的mRNA疫苗对病毒载荷和反弹动力学的影响.
主要方法:
- 在ART接种SIVmac239感染的 rhesus macaques (RMs) 接种了mRNA疫苗,在ATI之前立即表达SIV Gag,Nef和Pol.
- 在血液和淋巴细胞组织中评估了GAG特定的CD8+ T细胞反应.
- 在ATI后,对病毒反弹的时间和血病毒载荷 (PVL) 进行了监测.
主要成果:
- 该mRNA/SIVgag疫苗成功增强了Gag特异性的CD8+ T细胞.
- 与对照人群相比,mRNA/SIVgag和mRNA/SIVgag + Nef + Pol的疫苗接种显著延迟了病毒反弹,并在ATI后的前几周降低了PVL.
- 长期病毒控制没有实现,在复发后24周,各组的PVL相同.
结论:
- 在ATI时通过mRNA疫苗接种促进SIV特异性CD8+T细胞可以增强SIV感染重新激活的早期免疫向.
- 观察到的病毒控制是暂时的,这表明单独针对CD8+T细胞的疫苗不足以维持病毒控制.
- 辅助疗法是必要的,以提高由CD8+ T细胞的疫苗策略引起的病毒学控制的持久性.
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