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Blood:整合素α6介导急性B淋巴细胞白血病耐药性的产生

2020-04-01 MedSci原创 MedSci原创

整合素α6介导的粘附促进化疗治疗的B-ALL细胞的存活。 整合素α6可作为治疗B-ALL的新靶点。

对多模式化疗的耐药性持续限制了急性淋巴细胞白血病(ALL)的预后。其中部分是通过被称为粘附介导的耐药性的过程发生的,该过程依赖于ALL细胞通过黏附分子(包括整合素)黏附在基质上。

整合素蛋白α6与ALL中的微小残留病灶及ALL细胞向中枢神经系统迁移有关。但尚未有研究在化疗耐药性的背景下对其进行评估。

在本研究中,研究人员发现抗人α6阻断抗体P5G10可在体外诱导原发性ALL细胞凋亡,并可在体内外使原发性ALL细胞对化疗或酪氨酸激酶抑制敏感。

研究人员进一步通过条件性敲除小鼠BCR-ABL1+ B-ALL细胞的α6来分析了α6-相关性细胞凋亡的潜在机制,发现α6-缺血性ALL细胞会发生细胞凋亡。在体内敲除α6,加之酪氨酸激酶抑制剂(TKI)治疗比仅采用TKI(尼罗替尼)治疗能更有效的清除ALL细胞。

蛋白质组学分析显示小鼠ALL细胞的α6缺失与Src信号改变相关,包括磷酸化的Lyn(pTyr507)和Fyn(pTyr530)上调。

因此,本研究数据表明,α6可能是ALL的一个新型治疗靶点。

原始出处:

Eun Ji Gang, et al. Integrin α6 mediates drug resistance of acute lymphoblastic B-cell leukemia. Blood. March 27, 2020.

 

Eun Ji Gang, et al. Integrin α6 mediates drug resistance of acute lymphoblastic B-cell leukemia. Blood. March 27, 2020.

Blood:整合素α6介导急性B淋巴细胞白血病耐药性的产生

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Blood:靶向PRMT1介导的FLT3甲基化有望打破MLL重排型ALL的持续存在

复发仍然是MLL-r急性淋巴细胞白血病(ALL)治疗失败的主要原因,主要是由于常规化疗或靶向治疗后耐药克隆的持续存在。因此,明确MLL-r ALL持续存在的机制对开发有效的治疗方案至关重要。PRMT1在组蛋白/非组蛋白上沉积不对称的二甲基精氨酸(ADMA)标记,在多种癌症中过度表达。近期研究人员发现PRMT1在MLL-r ALL细胞中的表达水平升高,抑制PRMT1可显著抑制白血病细胞的生长和存活。

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