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与瘤相关的NKG2D配体的二硫化异构酶激活的脱落
Brett K Kaiser1, Daesong Yim, I-Ting Chow
1Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, Washington 98109, USA.
瘤通过释放MICA连接体来逃避免疫攻击,这是由细胞表面ERp5.5促进的. 抑制ERp5阻断了MICA的分泌,提供了一个新的癌症治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 分子生物学分子生物学
背景情况:
- 像MICA这样的瘤相关联体激活自然杀手 (NK) 细胞和效应T细胞,促进抗癌免疫力.
- 进展的瘤释放可溶性MICA,这会损害NKG2D受体的功能,并促进免疫抑制T细胞,帮助癌症免疫逃避.
研究的目的:
- 阐明瘤细胞MICA分泌的分子机制.
- 为了确定克服MICA介导的瘤免疫逃避的治疗目标.
主要方法:
- 研究了MICA与瘤细胞表面内质网膜蛋白5 (ERp5) 的相关性.
- 利用药理抑制ERp5硫缩酶活性和ERp5基因沉默.
- 分析了ERp5和MICA之间的混合二硫化物复合物的形成.
- 在减少其二硫化键后研究了MICA的蛋白质分解裂变.
主要成果:
- 细胞表面ERp5对于MICA的分泌至关重要.
- ERp5 形成了与膜固的 MICA 的过渡混合二硫化物复合体.
- 细胞膜附近的蛋白质分解裂变在ERp5介导的临界二硫化键的减少后释放出可溶性MICA.
- 这一过程涉及MICA的alpha3域的结构变化.
结论:
- 由ERp5进行的域特定解构调节了MICA脱落,这是瘤免疫逃避的关键机制.
- 表面ERp5是阻止MICA脱落和增强抗瘤免疫力的战略治疗标.
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