编程抗体反应的大小和持久性与天生的免疫力
Sudhir Pai Kasturi1, Ioanna Skountzou, Randy A Albrecht
1Emory Vaccine Center, Emory University, Atlanta, Georgia 30329, USA.
Nature
|February 26, 2011
概括
结合纳米颗粒中的Toll-like受体4 (TLR4) 和Toll-like受体7 (TLR7) 配体与抗原,可以协同增强长期中和抗体反应和B细胞记忆,这对于有效的疫苗接种至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 具有天生的免疫力.
背景情况:
- 成功的疫苗通常会诱导终身抗体反应,但涉及天生的免疫激活的潜在机制尚未完全理解.
- 通过托尔类受体 (TLR) 激活树突细胞与疫苗反应有关,协同TLR信号可能会增强T细胞免疫力.
- 联合TLR触发对长期抗体产生和B细胞记忆的具体影响在疫苗学中仍然是一个开放的问题.
研究的目的:
- 为了调查TLR4和TLR7配体与抗原通过纳米颗粒的联合递送是否可以协同增强抗原特异性抗体反应.
- 为了确定结合TLR刺激对生殖中心和血细胞的持久性的影响.
- 阐明TLRs在B细胞和树突细胞上的作用,以及T细胞在编程B细胞记忆和持久抗体免疫力方面的帮助.
主要方法:
- 用合成纳米颗粒免疫小鼠,与单个TLR配体 (TLR4或TLR7) 或两者的组合一起提供抗原.
- 分析了抗原特异性抗体标位,中和抗体活性,生殖中心持久性和血细胞群.
- 对B细胞进行了分子分析,以评估早期对记忆的编程.
- 在小鼠和 rhesus macaques 中对流感病毒株的免疫反应进行了评估.
主要成果:
- 与含有抗原加上TLR4和TLR7连体的纳米颗粒免疫接种诱导了与单连体配方相比,抗原特异性中和抗体的协同增加.
- 通过双重TLR连接剂治疗,观察到生殖中心和长寿血细胞 (>1.5年) 的持续性增强.
- 早期短暂的血细胞反应没有得到增强,但分子分析显示了早期对B细胞记忆的编程.
- 抗体反应取决于直接TLR触发B细胞和树突细胞,以及T细胞的帮助.
- 双重TLR配体免疫在小鼠中给予了对致命的禽猪流感的完全保护,在中给予了对大流行H1N1流感的强有力的免疫力.
结论:
- 通过纳米颗粒与抗原同时输送TLR4和TLR7配体,是诱导协同,持久的中和抗体反应的有效策略.
- 这种方法有效地编程B细胞记忆,并建立持久的幽默免疫力,为下一代疫苗开发提供了一个有希望的途径.
- 这些发现强调了结合天生的免疫受体信号在塑造适应性抗体免疫和保护性疫苗疗效方面的关键作用.
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