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Leukemia: JAK2 和 ERK 的双重靶向干扰骨髓增殖性肿瘤克隆并提高治疗效果

2021-12-17 MedSci原创 MedSci原创

JAK2 和 ERK1/2 的双重靶向有效地解决了 ERK1/2 激酶作为致癌信号传导的第二个节点,这保证了 MPN 的抑制。

骨髓增殖性肿瘤 (MPN) 是一种克隆性造血干细胞疾病,其特征是成熟髓细胞的过度输出和白血病转化的固有风险。MPN显示 JAK2 信号传导失调,而JAK2 抑制剂能提供临床益处,但 MAPK 通路信号的补偿激活会阻碍其疗效。因此,必须解决 MAPK 通路信号传导以增强 MPN 中 JAK2 抑制的治疗功效。

在这里,一研究团队假设 JAK2 和 ERK1/2 的双重靶向可以增强克隆控制和治疗效果。他们在Jak2 V617F MPN 小鼠、细胞和患者临床分离株中采用了 ERK1/2 的遗传和药理学靶向。

图 1:ERK1/2 的遗传靶向减轻了 MPN 表型并损害了Jak2 V617F 克隆。

Jak2 V617F 与野生型骨髓 (BM) 的竞争性移植表明,造血中的 ERK1/2 缺陷减轻了 MPN 特征并降低了Jak2血液和造血祖细胞区室中的 V617F 克隆。ERK1/2 消融结合 JAK2 抑制抑制 MAPK 转录程序,使细胞增殖正常化并促进克隆控制,表明双重 JAK2/ERK1/2 靶向作为增强的纠正方法。

图 2:ERK1/2 的基因靶向增强了鲁索替尼对Jak2 V617F 小鼠JAK2 抑制的纠正作用。

图 3:ERK1/2 抑制增加了Jak2 V617F 细胞对 JAK2 抑制的敏感性。

联合药理学 JAK2/ERK1/2 抑制与鲁索替尼和 ERK 抑制剂可减少Jak2 V617F 细胞的增殖并纠正Jak2 V617F MPN 小鼠的红细胞增多症和脾肿大。长期治疗能够诱导克隆减少。在MPL W515L 驱动的 MPN 中,BM 纤维化显着降低,达到 JAK2 抑制剂单药治疗所未见的程度。JAK2 V617F 患者 CD34 + 的集落形成血液和 BM 在 PV、ET 和 MF 亚群中被联合 JAK2/ERK1/2 抑制呈剂量依赖性抑制。

图 4:ruxolitinib/LTT462 对 JAK2 和 ERK1/2 的双重抑制增强了Jak2 V617F MPN 临床前模型的治疗效果。

图 5:ruxolitinib/LTT462 对 JAK2 和 ERK1/2 的双重抑制增强了MPL W515L MPN 临床前模型的治疗效果。

图 6:JAK2 和 ERK1/2 双重抑制增强了对原代JAK2 V617F 患者细胞的骨髓集落形成和 ERK1/2 靶标激活的抑制。

总的来说,他们的数据表明 JAK2 和 ERK1/2 的双重靶向有效地解决了 ERK1/2 激酶作为致癌信号传导的第二个节点,这保证了 MPN 的抑制。也在这里展示了 JAK2 和 ERK1/2 的双重靶向导致在几种 MPN 环境中的治疗性能增强,因此应该作为 MPN 患者的基于机制的治疗方法来追求。

 

原始出处:

Brkic, S., Stivala, S., Santopolo, A. et al. Dual targeting of JAK2 and ERK interferes with the myeloproliferative neoplasm clone and enhances therapeutic efficacy. Leukemia 35, 2875–2884 (2021). https://doi.org/10.1038/s41375-021-01391-2.

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    2022-08-01 chenlianhui
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    2021-12-21 ms5000000897108499

    靶向药物的研究为患者多了一条治疗之路,赞

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    2021-12-18 gao_jian4220
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    2022-02-24 aids221

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