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TWEAK减轻了从先天性免疫到适应性免疫的过渡
Heather Maecker1, Eugene Varfolomeev, Frank Kischkel
1Department of Molecular Oncology, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.
Cell
|December 6, 2005
概括
瘤亡因子类弱诱导细胞亡 (TWEAK) 蛋白抑制天生的免疫力,减少自然杀手 (NK) 细胞活性和干扰素- (IFN-γ) 生产. 这种TWEAK功能限制了向适应性T助手1 (TH1) 免疫反应的过渡.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 传染性疾病 传染性疾病
背景情况:
- 天生的免疫力提供了对病原体的初始防御,影响了随后的适应性免疫反应.
- 从天生的免疫过渡到适应性免疫是宿主防御的关键过程.
- 瘤亡因子-α (TNF-α) 是免疫反应的关键调解者.
研究的目的:
- 研究TWEAK (类似TNF的弱诱导细胞亡) 在调节先天免疫反应中的作用.
- 确定TWEAK如何影响从先天性免疫到适应性免疫的过渡.
- 阐明TWEAK调节细胞因子产生和免疫细胞活性的分子机制.
主要方法:
- 利用TWEAK淘汰赛 (TWEAK-/-) 小鼠研究先天性和适应性免疫反应.
- 评估免疫细胞种群,包括自然杀手 (NK) 细胞和T辅助1 (TH1) 细胞.
- 测量了细胞因子的产生 (干扰素-[IFN-γ]和介质素-12[IL-12]) 并分析了涉及STAT-1和NF-kappaB的分子通路.
主要成果:
- TWEAK-/-小鼠表现出增加的NK细胞和对细菌内毒素的过敏,IFN-γ和IL-12的产生增加.
- TWEAK抑制了STAT-1激活,并促进了p65 NF-kappaB与基因素脱乙酶1的结合,抑制了细胞因子合成.
- TWEAK-/-小鼠表现出扩大了脏,扩大了TH1细胞,并增强了TH1介导的应对瘤挑战的反应.
结论:
- TWEAK 作为 IFN-γ 和 IL-12 生产的抑制剂,从而抑制先天免疫反应.
- TWEAK限制了天生的免疫力向适应性TH1免疫力的过渡.
- 缺少TWEAK会导致先天性和适应性TH1免疫反应的增强,影响宿主防御和抗瘤免疫力.
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