在皮下BCG给药后,牛的γδ T细胞中存在先天性培养的证据
Beulah Esther Rani Samuel1, Fabian E Diaz1, Teresia W Maina2
1Department of Veterinary Microbiology and Preventive Medicine, Iowa State University, Ames, IA, United States.
Frontiers in immunology
|August 5, 2024
概括
在小牛中接种Bacillus Calmette Guerin (BCG) 疫苗可以训练马三角 (γδ) T细胞,增强它们的先天免疫反应. 这种训练有素的免疫包括表观遗传变化和增加的细胞因子生产,提供更广泛的保护.
科学领域:
- 免疫学 免疫学 免疫学
- 疫苗学 疫苗学 疫苗学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 细菌卡尔梅特·盖林 (BCG) 疫苗诱导训练免疫力,提供除了结核病之外的非特异性保护.
- 之前的研究表明,BCG诱导了牛单细胞的先天免疫训练.
- 玛三角 (γδ) T细胞在牛免疫力中至关重要,具有先天性和适应性特征.
研究的目的:
- 为了确定BCG的使用是否会诱导牛的 γδ T 细胞的先天免疫训练.
- 研究BCG接种后的γδ T细胞的功能和表观遗传变化.
主要方法:
- 16只预先断奶的霍尔斯坦小牛被随机分配到BCG疫苗或对照组.
- BCG疫苗组接受了两剂皮下注射;对照组没有接种疫苗.
- 在体外刺激后,玛三角形T细胞被净化并分析细胞因子 (IL-6,TNF-α) 和表观遗传修饰 (ATAC-Seq) 的产生.
主要成果:
- 经BCG治疗的小牛在刺激后在γδ T细胞中增加了IL-6和TNF-α的产生.
- ATAC-Seq揭示了BCG治疗小牛的γδ T细胞的表观遗传状态改变.
- 在具有丰富的转录因子结合基因 (Eomes,IRF-5) 的先天性免疫基因 (例如,Siglec14,Irf4) 附近观察到增强的染色质可访问性.
结论:
- 皮下BCG给药诱导牛的γδ T细胞的先天免疫记忆,是一种训练免疫的形式.
- 这种训练有素的免疫力以表观遗传改变和增强的功能反应为特征.
- 在 γδ T 细胞中BCG诱导的训练免疫可能有助于牛的非特异性保护.
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