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在IDH突变的AML细胞中,RIPK3缺陷阻断了R-2-基质酸盐诱导的亡

Shuanghong Zhu^1,2,3, Yingwan Luo^1,2, Kongfei Li^1,2

¹Department of Hematology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, PR China.

Science advances

|April 17, 2024

概括

突变的IDH酶产生R-2HG,一种抑制急性髓性白血病 (AML) 增长的分子. 在AML细胞中,R-2HG通过抑制KDM2B和上调RIPK1来触发细胞死亡途径 - - 亡.

科学领域:

生物化学生化学
分子生物学分子生物学
癌症生物学癌症生物学

背景情况:

突变异酸盐脱酶 (IDHs) 在急性髓性白血病 (AML) 中很常见.
突变的IDHs产生R-2-基酸盐 (R-2HG),它对AML细胞生长表现出抑制作用.
需要进一步阐明R-2HG抗白血病活性背后的精确机制.

研究的目的:

调查死细胞灭绝在R-2HG.抗白血病活性中的作用.
阐明R-2HG在AML细胞中发挥作用的分子机制.
确定IDH突变AML的潜在治疗策略.

主要方法:

使用AML细胞系的体外研究.
测试用于测量酶活性 (KDM2B),基因素甲基化和蛋白质表达 (RIPK1,RIPK3).
基因甲基化分析和药物治疗 (Decitabine).

主要成果:

R-2HG 抑制了 lysine 脱甲基酶 2B (KDM2B),增加了 3 基组素 lysine 4 三甲基化.
抑制KDM2B促进受体相互作用蛋白激酶1 (RIPK1) 的表达,诱导AML细胞中的亡.
由于DNA甲基化,IDH突变的AML细胞表现出沉默的RIPK3表达,从而产生对R-2HG的抗性;德西塔恢复了RIPK3和R-2HG的敏感性.

结论:

在AML细胞中,R-2HG通过KDM2B抑制诱导RIPK1-依赖性亡.
在IDH突变AML中,RIPK3表达的丧失赋予了对R-2HG诱导的亡的抗性.
恢复RIPK3表达是一种潜在的治疗策略,可以利用R-2HG在AML患者中的抗白血病作用.

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