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血红细胞生物合成对X辐射后的细胞存活和线粒体OXPHOS至关重要
Tomoki Bo1, Koen Van Wijk2, Osamu Nakajima2
1Laboratory Animal Center, Institute for Promotion of Medical Science Research, Yamagata University Faculty of Medicine, Japan.
射线照射可以促进癌细胞的血产生,这对线粒体能量至关重要. 通过抑制酸 (SA) 抑制血合成,可以降低癌细胞的存活率,并通过破坏能量产生来增加辐射敏感性.
科学领域:
- 生物化学 生物化学
- 癌症生物学 癌症生物学
- 辐射瘤学 辐射瘤学
背景情况:
- 血红蛋白对于线粒体电子运输链 (ETC) 蛋白质至关重要.
- 癌细胞表现出高的血红蛋白水平和血红蛋白活性.
- 血红蛋白生物合成的抑制降低了癌细胞的存活率,这表明它在增殖中的重要性.
研究的目的:
- 为了研究X辐射对血红素生物合成的影响.
- 为了确定抑制血红素生物合成是否会影响癌细胞的放射敏感性.
- 检查生物合成抑制对线粒体氧化酸化 (OXPHOS) 的影响.
主要方法:
- 在X光照射后评估血红素生物合成活性和血红素含量.
- 使用了基尼拉 (SA),一种血红素生物合成抑制剂.
- 测量了细胞ATP水平,线粒体膜潜力和ROS生产.
- 分析了线粒体ETC蛋白的表达.
主要成果:
- 射线照射增加了ALAS1 mRNA和细胞血含量.
- 治疗SA降低了细胞血,使细胞对辐射敏感,并降低了ATP水平.
- SA 损害了线粒体膜潜力和 ROS 生产,表明了 OXPHOS 功能障碍.
- 氨酸降低了COX2和细胞染色体c的表达,但没有COX1或VDAC.
结论:
- 射线照射可以提高血红素生物合成的调节.
- 血液生物合成对于线粒体OXPHOS和癌细胞生存至关重要.
- 抑制血合成通过破坏OXPHOS和耗尽ATP来增强辐射敏感性.
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