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通过通过C1QBP提升线粒体功能,PA28γ促进瘤的恶性进展
Jiongke Wang1, Yujie Shi1,2, Ying Wang1
1State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Research Unit of Oral Carcinogenesis and Management & Chinese Academy of Medical Sciences, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
eLife
|July 30, 2025
概括
蛋白酶激活剂28γ (PA28γ) 在口腔癌中稳定补充1q结合蛋白 (C1QBP),增强线粒体功能和瘤生长. 这种对OSCC进展至关重要的相互作用是潜在的治疗目标.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 蛋白质酶激活剂28γ (PA28γ) 与瘤进展有关,但其调节机制和具体作用尚不清楚.
- 了解PA28γ的相互作用对于开发向癌症疗法至关重要,特别是在口腔状细胞癌 (OSCC) 中.
研究的目的:
- 在OSCC中阐明PA28γ与补充1q结合蛋白 (C1QBP) 之间的相互作用.
- 研究这种相互作用对线粒体代谢和瘤进展的功能后果.
- 在OSCC中评估PA28γ和C1QBP联合表达的临床相关性和预后价值.
主要方法:
- 同免疫沉 (Co-IP) 和近距离结合试验 (PLA) 来确认PA28γ-C1QBP相互作用.
- 基于AlphaFold 3的分子对接和截断结构来映射相互作用领域.
- 线粒体功能测试 (OPA1,MFN1/2,OXPHOS,ATP,ROS) 和体外/体内瘤生长模型.
- 对临床OSCC队列的分析,以将蛋白质表达与预后相关联.
主要成果:
- PA28γ直接与C1QBP相互作用,主要通过C1QBP N端,稳定OSCC中的C1QBP蛋白水平.
- PA28γ-C1QBP复合物局部化到线粒体,增强线粒体融合,氧化酸化 (OXPHOS),ATP生产和ROS生成.
- 由PA28γ驱动的OSCC细胞迁移,入侵和增殖取决于C1QBP.
- 在体内,PA28γ过度表达会增加瘤生长,ATP和ROS,而PA28γ缺乏会抑制这些效应.
- PA28γ和C1QBP的高联合表达与OSCC患者的预后不佳相关.
结论:
- 通过N端相互作用,PA28γ稳定了C1QBP,促进了线粒体代谢,并推动了OSCC的进展.
- PA28γ-C1QBP轴代表了口腔致癌和转移潜力的重要因素.
- 针对PA28γ-C1QBP相互作用为OSCC提供了一个有希望的治疗策略.
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