在N57/100/110的N-糖化对肝细胞癌的CD44s定位,功能和稳定性产生影响
Qixiang Cheng1, Xibo Hu1, Xiaoqing Zhang2
1School of Life Sciences and Technology, Harbin Institute of Technology, Harbin, Heilongjiang 150001, China.
European journal of cell biology
|September 13, 2023
概括
CD44上的关键N-糖化位点影响其细胞膜定位和在肝癌中的功能. 这些部位的突变导致细胞质积累和溶酶体降解,为转移提供了新的治疗点.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 葡萄糖生物学 葡萄糖生物学
背景情况:
- 异常的蛋白质糖化是癌症的标志,影响侵袭和转移.
- CD44是一种在瘤中过度表达的跨膜糖蛋白,促进癌细胞迁移,但其N-糖化酶的作用尚未得到充分研究.
研究的目的:
- 为了研究N-糖化对CD44定位,功能和稳定性在肝癌细胞的影响.
- 确定特定的N-糖化位,这些位点对于CD44在癌症进展中的作用至关重要.
主要方法:
- 在CD44.4上六个N-糖化位点的位点定向突变发生.
- 细胞局部化研究 (Huh7和MHCC-97H细胞).
- 评估癌细胞的入侵和迁移,ER压力标志物 (BiP) 和蛋白质降解途径 (溶酶体抑制剂CQ).
主要成果:
- 所有六个N-糖化位的突变导致CD44失去膜局部化.
- 鉴定出N57,N100和N110对CD44细胞内定位至关重要;它们的突变导致了细胞质CD44.
- 突变N57Q/N100Q/N110Q显示转移和入侵的促进减少,在ER积累,触发ER压力,并通过 lysosomal路径 (ERLAD) 降解.
结论:
- 在CD44上的N-糖化位点N57,N100和N110对于其在肝癌中的功能和膜局部化至关重要.
- 改变的糖化会影响CD44的稳定性,导致ER压力和溶酶体降解.
- 这些发现提供了关于CD44甘氨酸功能的见解,与ER相关的降解,以及肝癌转移的潜在治疗策略.
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