失去了cystathionine-β-synthase有助于增加OXPHOS,这是一种在唐氏综合征中对Ara-C抗性髓性白血病的脆弱性
Jenna Thibodeau1, Jianlei Zhao2, Holly Edwards2
1Cancer Biology Graduate Program, Wayne State University School of Medicine, Detroit, MI, USA.
囊氨酸β合成酶 (CBS) 调节氧化酸化 (OXPHOS) 和细胞arabine (Ara-C) 响应在氏综合征 (ML-DS) 的骨髓性白血病. 针对OXPHOS和亡,为复发性/耐药性ML-DS提供了一个有前途的治疗方法.
科学领域:
- 血液学 血液学 血液学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 唐氏综合征 (ML-DS) 骨髓性白血病对细胞氨基酸 (Ara-C) 化疗的初始反应良好,但复发/耐药病例的结果不佳.
- 囊氨酸β合成酶 (CBS) 在ML-DS中过度表达,增加硫化 (H2S) 和降低氧化酸化 (OXPHOS),这是一种涉及Ara-C耐药性的途径.
研究的目的:
- 调查CBS在调节OXPHOS中的作用以及ML-DS中对Ara-C的反应.
- 评估复发性/耐药性ML-DS的新型治疗策略.
主要方法:
- 研究了Ara-C敏感和抗性ML-DS细胞系中的CBS活性,H2S生产和OXPHOS.
- 操纵CBS表达 (过度表达和敲击) 以评估其对Ara-C敏感性和OXPHOS的影响.
- 评估了针对Ara-C抗性ML-DS细胞中的OXPHOS (ONC213) 和亡 (venetoclax) 的协同效应.
主要成果:
- 抗Ara-C的ML-DS细胞表现出较低的CBS活性.
- 在耐药细胞中过度表达CBS增加了H2S和Ara-C敏感性,同时降低了OXPHOS.
- 在敏感细胞中击败CBS增加了OXPHOS和Ara-C抵抗,复杂IV活性降低但H2S不变,表明OXPHOS的双CBS调节.
- 联合ONC213和venetoclax在抗Ara-C的ML-DS细胞中协同诱导细胞死亡.
结论:
- 在ML-DS中,CBS通过H2S-依赖和S-独立机制作为OXPHOS和Ara-C反应的关键调节者.
- 通过向OXPHOS和亡,ONC213和venetoclax的组合为复发性/耐药性ML-DS提供了一个有希望的治疗策略.
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