失去RUNX3表达和胃癌之间的因果关系
Qing Lin Li1, Kosei Ito, Chohei Sakakura
1Department of Biochemistry, College of Medicine, Institute of Medical Research, Chungbuk National University, 361-763, Cheongju, South Korea.
Cell
|April 17, 2002
概括
Runx3是胃上皮细胞生长的关键调节剂. 失去Runx3功能与胃癌的发展和进展有关,如在小鼠模型和人类癌细胞中所见.
科学领域:
- 分子生物学分子生物学
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
背景情况:
- Runx3 (与Runt相关的转录因子3) 在调节细胞增殖和细胞亡方面发挥着关键作用.
- 胃上皮细胞平衡对于预防胃癌至关重要.
- 增长调节者的调节失调与癌症的发病有关.
研究的目的:
- 研究Runx3作为胃上皮细胞生长调节剂的作用.
- 确定RUNX3表达水平与人类胃癌发展之间的关联.
- 阐明RUNX3突变对其瘤抑制功能的影响.
主要方法:
- 分析Runx3/Pebp2alphaC无菌鼠的胃粘膜.
- 对RUNX3表达和促进物甲基化的人类胃癌细胞系的评估.
- 将人类胃癌细胞系移植到裸体小鼠体内,以评估瘤性.
- 局部定向的突变发生能产生一个RUNX3 Runt域突变 (R122C).
主要成果:
- 鼠标Runx3无胃粘膜显示过度增生,增多增殖,并抑制了上皮细胞的亡.
- 这些细胞对TGF-β介导的生长抑制和亡诱导具有抗性.
- 45-60%的人类胃癌细胞显示RUNX3表达显著减少,原因是缺失或高甲基化.
- 裸体小鼠中的瘤原发性与RUNX3表达水平相反相关.
- 在RUNX3的Runt域中发生的突变 (R122C) 取消了其瘤抑制活性.
结论:
- Runx3是胃上皮细胞生长的主要调节剂,也是胃中的关键瘤抑制剂.
- 通过删除,甲基化或突变,RUNX3功能的丧失与胃癌的起源和进展有因果关系.
- 恢复RUNX3功能可能是胃癌的治疗策略.
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