Br J Cancer:SBI-756 + venetoclax:新型B细胞淋巴瘤治疗组合

2020-12-29 xiaozeng MedSci原创

mTOR是细胞生长和增殖的主要调节因子,也是癌症和其他疾病治疗的一个靶标。mTORC1和mTORC2是促进mTOR信号转导通路的两个复合物。既往研究显示,mTOR的激活突变发生在弥漫性大B细胞淋巴瘤(

mTOR是细胞生长和增殖的主要调节因子,也是癌症和其他疾病治疗的一个靶标。mTORC1和mTORC2是促进mTOR信号转导通路的两个复合物。既往研究显示,mTOR的激活突变发生在弥漫性大B细胞淋巴瘤(DLBCL)中,而mTORC1得活性升高与急性B淋巴细胞白血病(B-ALL)的化疗耐药性和不良预后相关。

BCL2抑制剂维奈克拉(Venetoclax)是一种小分子BH3模拟药物,可选择性的结合BCL2并抑制其功能。已在多种血液系统恶性肿瘤中显示出了一定的疗效,在惰性血液癌症(如慢性淋巴细胞白血病)中的应答率最高。而在DLBCL中,Venetoclax单药治疗的患者反应率较低。


在该研究中,研究人员检测了帽依赖性mRNA翻译抑制剂联合Venetoclax对DLBCL和套细胞淋巴瘤(MCL)细胞凋亡作用的敏感程度。研究人员比较了mTOR激酶抑制剂(TOR-KI)MLN0128以及SBI-756的效果。SBI-756是靶向eIF4F复合物中脚手架蛋白eIF4G1的一种化合物。

SBI-756阻止eIF4E-eIF4G相互作用和帽依赖性翻译

研究人员发现,Venetoclax联合SBI-756处理DLBCL和MCL细胞能够诱导细胞凋亡的发生,并增强Venetoclax的功效。SBI-756能够阻止eIF4E-eIF4G1的结合并抑制帽依赖性翻译,但不会影响mTOR底物的磷酸化。在缺少eIF4E结合蛋白1的TOR-KI耐药性DLBCL细胞中,SBI-756仍能使细胞对Venetoclax敏感。


SBI-756能够选择性地减少编码核糖体蛋白和翻译因子的mRNA的翻译,从而导致敏感细胞中蛋白质合成速率的降低。而当使用SBI-756处理正常的淋巴细胞时,只有B细胞的活力降低,这与蛋白合成速率降低相关。

SBI-756使Venetoclax治疗致敏

综上,该研究结果揭示了一种用于治疗侵袭性淋巴瘤的新型组合,并使用临床前模型确定了该组合的疗效和选择性。


原始出处:

Herzog, Lo., Walters, B., Buono, R. et al. Targeting eIF4F translation initiation complex with SBI-756 sensitises B lymphoma cells to venetoclax. Br J Cancer (14 December 2020).

 

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