通过分子适配器Cbl-bb对淋巴细胞激活和自身免疫的负调节
K Bachmaier1, C Krawczyk, I Kozieradzki
1Amgen Institute, Department of Medical Biophysics, University of Toronto, Ontario, Canada.
Nature
|January 26, 2000
概括
适应蛋白Cbl-b对于维持免疫耐受性至关重要. 在小鼠中缺少它会导致自身免疫,这是由于不受控制的淋巴细胞激活和自身抗体的产生.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 这是一种自身免疫力.
背景情况:
- 免疫耐受性是由抗原和共刺激受体的信号值调节的.
- 同刺激途径的调节失调可能导致自身免疫或无能.
- 控制T和B淋巴细胞激活和耐受性的分子机制尚未完全理解.
研究的目的:
- 研究Cbl/Sli家族适应蛋白Cbl-b在调节淋巴细胞激活和免疫耐受性的作用.
- 阐明Cbl-b将共刺激信号与抗原受体信号集成的分子机制.
主要方法:
- 基因向小鼠缺乏Cbl-b (cbl-b(-/-)) 被生成和分析.
- 评估了淋巴细胞的增殖,细胞因子的产生 (介质素-2,干扰素-,瘤亡因子-α) 和信号通路 (Vav1酸化).
- 评估了cbl-b(-/-) 小鼠的免疫细胞透和组织损伤.
主要成果:
- 缺乏Cbl-b的小鼠自发地产生了自身免疫,包括自身抗体的产生和淋巴细胞透到器官中.
- 在抗原受体刺激时,休息的cbl-b-/-) 淋巴细胞表现出高增殖.
- 由于Cbl-b缺乏,T细胞中导致了互白素-2的过度产生,这与CD28协同刺激要求无关.
结论:
- Cbl-b是成熟淋巴细胞激活值的关键调节者.
- Cbl-b在维持免疫耐受性和预防自身免疫性方面发挥着关键作用.
- 缺少Cbl-b会破坏协同刺激信号的整合,导致自身免疫反应.
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