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Blood:N-RasG12D棕榈酰化的遗传变异影响造血作用并阻碍髓样转化

2020-04-01 MedSci原创 MedSci原创

致癌RAS突变对开发有效的药物来说是一个巨大的挑战。Ras亚型的高频变异区(HVR)内的序列变异是差异化的翻译后修饰和亚细胞运输的基础,可能会导致选择性的漏洞。

注释:棕榈酰化修饰,是蛋白质翻译后脂质修饰的重要形式,是调控蛋白质的转运、稳定、定位和功能的重要机制,同时,棕榈酰化修饰还参与多种细胞生物学进程,与许多疾病的发生发展密切相关。

致癌RAS突变对开发有效的药物来说是一个巨大的挑战。Ras亚型的高频变异区(HVR)内的序列变异是差异化的翻译后修饰和亚细胞运输的基础,可能会导致选择性的漏洞。

具体而言,抑制棕榈酰化/去棕榈酰化周期是治疗NRAS突变型癌症的诱人策略,尤其是正常组织保留K-Ras4b功能可实现生理信号传导。

内源性N-RasG12D棕榈酰化在信号转导、造血分化和髓样转化中的作用尚不清楚,解决这些关键问题将为开发新的疗法提供理论基础。

为了在体内疾病相关模型系统中评估棕榈酰化/去棕榈酰化循环作为候选药物靶标,研究人员将 C181S突变引入条件下NrasG12D“敲入”等位基因。C181S第二位氨基酸替换通过NrasG12D遏制了髓样转化(与非棕榈酰化N-Ras突变蛋白的错误定位有关),并减少了Raf/MEK/ERK信号传导和造血干细胞/祖细胞变异。

此外,NrasG12D/G12D,C181S复合杂合小鼠产生的血液恶性肿瘤总是获得恢复半胱氨酸181的恢复突变。

总之,本研究证实了棕榈酰化循环是NRAS突变癌中有希望的治疗靶点。

原始出处:

Naomi A. Zambetti, et al. Genetic disruption of N-RasG12D palmitoylation perturbs hematopoiesis and prevents myeloid transformation in mice. Blood. MARCH 27, 2020.

 

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