在同一侧:VISTA及其连接物在细胞表面的 cis 中相互作用
Karina Smorodinsky-Atias1, Gil Wiseglass1, Alina Artyukhova1
1School of Neurobiology, Biochemistry and Biophysics, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel.
Protein science : a publication of the Protein Society
|December 22, 2025
概括
免疫检查点蛋白VISTA在cis (同一个细胞) 中结合配体,而不是trans (细胞之间). 这一发现使VISTA变得更加清晰.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 维斯塔是一种关键的免疫检查点蛋白,调节T细胞功能和耐受性.
- 了解VISTA的结合机制对于开发抗瘤和自身免疫疗法至关重要.
- 之前的研究对VISTA的膜方向和连接体相互作用模式缺乏明确性.
研究的目的:
- 为了阐明VISTA的结合模式和膜方向.
- 调查VISTA是否与其在trans或cis中的配体相互作用.
- 为开发针对VISTA的新型治疗提供框架.
主要方法:
- 细胞聚合试验用于评估跨相互作用.
- 微尺度热泳 (MST) 和流动细胞测量用于可溶性VISTA结合.
- 分裂化酶补充试验用于膜绑定VISTA相互作用.
- 癌症基因组图谱数据分析用于共同表达模式.
主要成果:
- 维斯塔不会以转化方式与配体相互作用.
- 可溶性VISTA结合了连接体,但膜结合的VISTA的方向限制了跨相互作用.
- 带膜连接的VISTA表现出与其连接体的 cis 相互作用.
- 在癌症数据中观察到强烈的VISTA和PSGL-1共同表达相关性.
- 维斯塔的Ig域可能朝着膜方向,有利于cis相互作用.
结论:
- 维斯塔主要与其在cis中的配体相互作用,在同一个细胞上.
- 这种cis相互作用表明VISTA内在的信号通路.
- 这些发现澄清了VISTA的机制,使有针对性的治疗开发成为可能.
- 这项研究为VISTA药物发现提供了一个新的实验平台.
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