糖氨基甘氨基介导的脂蛋白摄取保护癌细胞免受铁灭症的影响
Dylan Calhoon1,2, Lingjie Sang1,2, Divya Bezwada1
1Children's Medical Center Research Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
bioRxiv : the preprint server for biology
|May 20, 2024
概括
癌细胞利用循环中的脂蛋白来抵抗由脂质过氧化引起的细胞死亡. 这种吸收依赖于细胞表面的硫化糖氨基 (GAG),揭示了瘤存活的新机制.
科学领域:
- 生物化学 生物化学
- 癌症生物学 癌症生物学
- 分子瘤学分子瘤学
背景情况:
- 脂质在瘤结构,能量和信号传递中起着至关重要的作用.
- 癌细胞通过脂蛋白增加脂质合成和循环脂质的吸收.
- 细胞外脂质吸收的机制及其对癌症进展的贡献尚未完全理解.
研究的目的:
- 为了研究驱动癌症细胞外脂质吸收的机制.
- 确定脂蛋白吸收如何影响癌症进展和细胞死亡.
- 确定与瘤中的脂质代谢相关的新型治疗点.
主要方法:
- 功能性遗传选被用来识别关键途径.
- 脂蛋白补充剂被用来评估铁灭抑制.
- 机理学研究重点是硫酸糖氨基甘油 (GAG) 和蛋白质甘油的作用.
- 在小鼠模型中进行了实验,并对人类清细胞细胞癌进行了分析.
主要成果:
- 脂蛋白吸收赋予了对脂质过氧化和铁亡的抵抗力.
- 脂蛋白补充剂在各种癌症类型中抑制铁化.
- 癌细胞通过依赖细胞表面GAG的途径内部化脂蛋白.
- 损坏的GAG合成或降解减少了脂蛋白吸收,增加了ferroptosis的敏感性,并抑制了瘤的生长.
- 人类清晰细胞细胞癌显示出由脂蛋白衍生的抗氧化剂和氏丁硫酸盐的升高.
结论:
- 脂蛋白吸收是癌细胞对抗脂质氧化应激和ferroptosis in vivo的关键机制.
- 葡萄糖氨基甘氨酸 (GAG) 生物合成是这种抗ferroptotic过程的意想不到但至关重要的中间体.
- 向GAG可能代表了一种新的治疗策略,以使瘤对铁灭症敏感.
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