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通过自然杀伤性T细胞识别细菌糖脂

Yuki Kinjo¹, Douglass Wu, Gisen Kim

¹Division of Developmental Immunology, La Jolla Institute for Allergy and Immunology, San Diego, 10355 Science Center Drive, San Diego, California 92121, USA.

|March 26, 2005

概括

自然杀手T (NKT) 细胞识别细菌糖脂,作为一种天生的免疫反应. 这一发现突出了NKT细胞的重要意义.

科学领域:

免疫学免疫学免疫学
微生物学微生物学

背景情况:

自然杀伤性T (NKT) 细胞是一种保存的T淋巴细胞亚群,对于通过细胞因子分泌来调节免疫反应至关重要.
NKT细胞识别了由CD1d分子呈现的甘油脂,并拥有不变的T细胞抗原受体 (TCR) α链.
通过NKT细胞的不变TCR识别微生物抗原仍然是争论的主题.

研究的目的:

为了调查不变NKT细胞是否能识别微生物抗原.
探索NKT细胞在免疫反应中对格拉姆阴性细菌的作用.

主要方法:

分析NKT细胞对来自Sphingomonas细菌的葡萄糖脂的识别.
在体内研究评估NKT细胞在接触细菌抗原或细菌时的激活.
在NKT细胞缺陷小鼠和野生型小鼠中比较Sphingomonas清除值.

主要成果:

大多数小鼠和人类NKT细胞被发现可以识别来自Sphingomonas的甘氨基脂,这是一个缺乏脂多糖的阴性细菌.
在暴露于这些细菌抗原或细菌本身后,体内观察到NKT细胞激活.
缺少NKT细胞的小鼠在清除Sphingomonas从肝脏中的功能显著受损.

结论:

NKT细胞作为T淋巴细胞起作用,通过TCR介导的识别来调解针对特定微生物的先天性免疫反应.
这些发现表明NKT细胞在保护不被模式识别受体 (如Toll-like受体4) 检测到的细菌方面可能发挥作用.

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