β1-整蛋白控制IGF-1R内部化和细胞内信号传递
Niamh McDermott1, Stephen O'Shea1, Leonie Rieger1
1Cell Biology Laboratory, School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland.
The Journal of biological chemistry
|November 28, 2024
概括
在Tyr1250/1251中胰岛素样生长因子1受体 (IGF-1R) 的酸化驱动癌细胞迁移,并通过β1-整合素 (ITGB1) 信号增强,促进瘤的攻击性.
科学领域:
- 分子和细胞生物学 分子和细胞生物学
- 癌症研究 癌症研究
- 细胞信号传递 细胞信号传递
背景情况:
- 胰岛素样生长因子1受体 (IGF-1R) 在C-终端尾部氨酸 (Tyr1250/1251) 的酸化与细胞迁移和癌症的攻击性有关.
- 由于存在这些特定的铁素,IGF-1R活性与胰岛素受体不同.
- 粘附信号通路显著影响癌细胞中的受体定位和活性.
研究的目的:
- 研究细胞粘附信号如何影响IGF-1R在迁移性癌细胞和纤维细胞中的局部化和活性.
- 阐明β1-整合素 (ITGB1) 在调节IGF-1R稳定性,内化和酸化中的作用.
- 确定Tyr1250/1251酸化对IGF-1R原原源性功能的贡献.
主要方法:
- 分析IGF-1R在三阴性乳腺癌组织与非瘤组织中的局部化.
- 在患者数据集中对IGF-1R和β1-整体素 (ITGB1) 表达的相关性分析.
- 在癌细胞和纤维细胞中对ITGB1表达的实验操纵,包括使用IGF-1R突变体 (FF和EE).
- 在模拟中,评估氨酸突变对IGF-1R C端尾部的构造影响.
主要成果:
- 与正常组织相比,IGF-1R在三阴性乳腺癌组织中主要是细胞内.
- 在基底类乳腺癌中,IGF-1R和ITGB1表达之间存在正相关性.
- 抑制ITGB1增加了IGF-1R在血中的稳定性,并减少了内部化.
- 抑制ITGB1会降低IGF-1R自酸化和纤维细胞中的戈尔吉积累.
- Tyr1250/1251的酸化对于ITGB1介导的IGF-1R内部化是必不可少的.
- IGF-1R Tyr1250/1251Glu (EE) 突变增强了细胞迁移和殖民地形成.
结论:
- Tyr1250/1251 IGF-1R 的酸化赋予了独特的原始源信号传导能力.
- β1-整合素 (ITGB1) 信号增强IGF-1R的原原源活性,通过促进其内部化.
- 这些发现突出了IGF-1R和ITGB1在驱动癌症进展中的关键相互作用.
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