激活酸激酶可以通过减少3带氨酸酸化,改善红细胞的完整性
Kang Le1, Xunde Wang1, Jonathan Chu2
1Laboratory of Sickle Cell Genetics and Pathophysiology, Sickle Cell Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.
Blood advances
|September 12, 2024
概括
在状细胞疾病 (SCD) 中使用AG-348激活酸盐激酶 (PK) 会增加红细胞ATP,改善血红蛋白水平和生存率. 这些好处在停止治疗后仍然存在,这表明可行的抗治疗.
科学领域:
- 生物化学 生化学
- 血液学 血液学 血液学
- 药理学 药理学是指药理学的学科.
背景情况:
- 状细胞疾病 (SCD) 是一种遗传性血液疾病,其特征是血红蛋白异常.
- 酸盐激酶 (PK) 激活是SCD的潜在治疗策略.
- 之前的研究建立了SCD中PK激活的概念证明.
研究的目的:
- 为了研究通过PK激活调节的分子通路,从而提高治疗后红细胞 (RBC) 存活率.
- 了解AG-348 (mitapivat) 在SCD患者中停止治疗后对红细胞的持续影响.
主要方法:
- 在SCD患者中分析了AG-348的第一阶段研究 (NCT04000165) 的冷全血样本.
- 单独的红细胞幽灵体的西部涂抹,以评估带3 (Tyr-p-bd3) 的氨酸酸化,ankyrin-1和蛋白质氨酸酸酶1B (PTP1B) 的水平.
- 在HbAA和HbSS红细胞中对AG-348的反应中测量ATP生产,calpain活性和Ca2+流量.
主要成果:
- 治疗AG-348导致Tyr-p-bd3的剂量依赖性下降,并增加了ankyrin-1和PTP1B水平,治疗后恢复到基线水平.
- AG-348增加了ATP的产生,降低了calpain活性,并增强了红细胞中的Ca2+流量.
- 在AG-348停止后,血红蛋白水平的升高持续了4周.
结论:
- 通过AG-348的PK激活调节红细胞膜蛋白和平衡,有助于改善红细胞生存率.
- 增加ATP生产是SCD中PK激活后持续血红蛋白增加的关键机制.
- AG-348代表了一种有前途的治疗方法来治疗状细胞疾病.
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