在内分泌疗法耐药乳腺癌中,胺诱导的内分泌网膜压力是可向的脆弱性
Purab Pal1, Shweta Chitkara2, Godwin K Sarpey1
1Department of Physiology and Biophysics, University of Illinois Chicago, IL, USA.
乳腺癌的内分泌疗法耐药性包括胺的减少和对胺诱导的细胞死亡的敏感性增加. 陶胺通过PERK激活内质网膜应激 (EnRS) 途径,导致抵抗性细胞的细胞死亡,特别是通过TRAM1相互作用.
科学领域:
- 癌症学
- 分子生物学
- 细胞生物学
背景情况:
- 内分泌疗法 (ET) 对激素受体阳性乳腺癌是有效的,但由于治疗耐药性和患者复发而面临挑战.
- 抗ET乳腺癌细胞表现出胺代谢的改变,显示胺水平的降低和对胺诱导的细胞死亡的敏感性增加.
研究的目的:
- 研究胺在耐ET乳腺癌细胞中诱导细胞死亡的机制.
- 确定涉及ET耐药性中胺介导细胞死亡途径的特定蛋白质.
主要方法:
- 在胺治疗后对抗ET细胞的转录重编程的分析.
- 评估内质网膜应激 (EnRS) 和PERK通路在胺诱导的细胞死亡中的作用.
- 使用可光激活的胺探针来识别胺相互作用蛋白 (CIP).
- 在ET抗性模型和患者数据中研究TRAM1的功能.
主要成果:
- 在耐ET细胞中诱导明显的转录重编程,上调EnRS通路.
- 胺诱导的EnRS依赖于PERK通路,并在多个ET耐药模型中调解细胞死亡.
- TRAM1被确定为ET耐药细胞中的关键胺相互作用蛋白 (CIP),与较低的无复发存活率和侵袭性乳腺癌表型相关.
- TRAM1的破坏模仿了胺在ET抵抗中的作用,突出显示了它在胺诱导的细胞死亡中的作用.
结论:
- 与ET敏感细胞相比,耐ET乳腺癌细胞对PERK介导的EnRS更敏感.
- 胺利用这种敏感性与TRAM1等CIP相互作用,激活PERK,并在ET耐药模型中诱导细胞死亡.
- 向胺-TRAM1-PERK轴为克服乳腺癌中ET抗性的潜在治疗策略.
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