CD8alphabeta核受体茎的发育调节的糖化调节了连接体结合的过程
1Laboratory of Immunobiology, Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.
Cell
|November 24, 2001
概括
细胞分化改变了CD8β上的O-甘氨酸,影响T细胞受体结合. ST3Gal-I酶修改了这些甘氨酸,在T细胞成熟过程中降低了CD8alphabeta-MHCI狂热度.
科学领域:
- 免疫学 免疫学 免疫学
- 葡萄糖生物学 葡萄糖生物学
- 细胞分化 细胞分化
背景情况:
- 甘氨酸在细胞分化中的结构变化的作用尚不清楚.
- 在CD8alphabeta核受体茎上的O-甘氨酸会影响小胞细胞表面相互作用.
研究的目的:
- 在T细胞发育过程中研究O-甘氨酸修饰对CD8alphabeta核受体的功能影响.
- 确定ST3Gal-I sialyltransferase活性如何影响CD8alphabet-MHCI结合力.
主要方法:
- 对与不成熟 (CD4 ((+)) CD8 ((+)) 和成熟 (CD8 ((+)) 胸细胞结合的MHCI四相酶的比较分析.
- 在ST3Gal-I表达方面对CD8beta上的O-甘氨酸结构的评估.
- 评估CD8alphabeta-MHCI狂热度变化与糖修饰相关的变化.
主要成果:
- 不成熟的胸细胞比成熟的胸细胞表现出更高的MHCI四聚体结合力.
- 发育调节的ST3Gal-I诱导导致CD8beta上的O-甘氨酸修饰.
- 通过ST3Gal-I向CD8beta添加酸会降低CD8alphabeta-MHCI的欲.
结论:
- 在CD8β茎上的O-甘氨酸调节CD8α-MHCI结合率.
- 在分化过程中,ST3Gal-I介导的甘氨酸变化对调节T细胞核受体功能至关重要.
- 甘氨酸修饰微调CD8alphabeta和MHCI之间的相互作用.
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