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在慢性淋巴细胞白血病中,Siglec-6作为细胞迁移和粘附的治疗点

Jessica Nunes^1,2, Rakeb Tafesse^1,2, Charlene Mao¹

¹Comprehensive Cancer Center, The Ohio State University, Columbus, OH, USA.

Nature communications

|June 18, 2024

概括

西格莱克-6 (酸结合性免疫球蛋白类似的莱克丁6) 促进慢性淋巴细胞白血病 (CLL) B细胞迁移. 用双特异性抗体向Siglec-6,在CLL模型中显示了治疗潜力.

科学领域:

免疫学免疫学免疫学
细胞生物学细胞生物学
血液学血液学血液学

背景情况:

西格莱克-6是一种在特定细胞 (包括B细胞) 中发现的莱克受体.
它在慢性淋巴细胞白血病 (CLL) 病理生理学中的作用尚不清楚.
CLL B细胞表达Siglec-6,这表明可能与疾病有关.

研究的目的:

调查Siglec-6在CLL B细胞迁移和粘附中的作用.
在CLL细胞中识别与Siglec-6相互作用的蛋白质.
评估针对CLL中的Siglec-6的治疗潜力.

主要方法:

在体外检测B细胞粘附于骨髓 stromal 细胞.
在小鼠模型中的体内迁移研究.
质谱测量用于识别Siglec-6相互作用蛋白.
刺激测试用于分析下游的信号通路.
在小鼠模型中测试一种Siglec-6/CD3双特异性T细胞招募抗体 (T-biAb).

主要成果:

在实验室中,Siglec-6调解了CLL B细胞对骨髓 stromal 细胞的粘附.
在体内,Siglec-6缺乏或阻塞会影响CLL细胞迁移到淋巴体器官.
西格莱克-6与瓜核酸交换因子DOCK8相互作用.
激活Siglec-6连接体会激活Cdc42,导致F-actin聚合并增强细胞迁移.
在临床前模型中,一种Siglec-6/CD3双特异性T细胞招募抗体 (T-biAb) 显示出显著的治疗疗效,改善存活率和消除CLL细胞.

结论:

西格莱克-6在CLL B细胞迁移和粘附中起着至关重要的作用.
西格莱克-6-DOCK8相互作用参与调节细胞迁移途径.
用双特异性抗体向Siglec-6代表了对CLL的有希望的治疗策略.

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