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肝脏巨细胞和状内皮细胞执行疫苗引起的侵入性细菌的捕获
Juanjuan Wang1,2, Haoran An1,2, Ming Ding1
1Center for Infectious Disease Research, Department of Basic Medical Science, School of Medicine, Tsinghua University, Beijing 100084, China.
Science translational medicine
|December 20, 2023
概括
疫苗对侵入性细菌的免疫主要发生在肝脏中,利用库普弗细胞和内皮细胞捕获和清除病原体,这取决于疫苗的效力.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 微生物学 微生物学
背景情况:
- 细菌疾病负担需要有效的疫苗.
- 疫苗诱导病原体清除的机制尚未完全理解.
- 目前的理解强调吸食细胞为血液传播的病原体迁移.
研究的目的:
- 阐明疫苗引起的对侵袭性细菌的免疫机制.
- 为了研究肝脏在疫苗媒介病原体清除中的作用.
- 确定疫苗功效如何影响免疫细胞激活和病原体捕获.
主要方法:
- 在小鼠中使用了疫苗接种模型.
- 分析了免疫细胞激活,特别是库弗弗细胞 (KCs) 和肝脏侧状内皮细胞 (LSECs).
- 研究了免疫球蛋白M (IgM),免疫球蛋白G (IgG),补充受体 (CRIg,CR3) 和Fcγ受体 (FcγRs) 在病原体结合和清除中的作用.
- 采用FcγR人性化小鼠来证实这些发现.
主要成果:
- 疫苗对侵入性细菌的免疫主要在肝脏中起作用.
- 低强度疫苗通过IgM和低IgG水平激活KC,使用FcγRs,CRIg和CR3.
- 高效率的疫苗会激活KC和LSEC,由高位IgG介导.
- LSECs通过FcγRIIB捕获IgG-opsonized细菌,并促进细胞外杀戮.
结论:
- 疫苗引起的对侵入性细菌的免疫力主要以肝脏为中心.
- 肝脏中的免疫机制因疫苗的保护性有效性而异.
- 这些发现提供了关于疫苗有效性和抗体增强免疫力的见解.
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