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通过巨细胞传递CD24信号的Siglec-10是癌症免疫治疗的目标
Amira A Barkal1,2,3,4, Rachel E Brewer1,2,3, Maxim Markovic1,2,3
1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|August 2, 2019
概括
癌细胞通过CD47和PD-L1等"不要吃我"信号来逃避免疫检测. 研究人员发现CD24作为主导性免疫检查点,阻断巨细胞清除,并为卵巢和乳腺癌提供新的免疫治疗点.
科学领域:
- 免疫学
- 癌症学
- 细胞生物学
背景情况:
- 卵巢和三阴性乳腺癌是致命的,具有有限的向治疗和高的转移率.
- 癌细胞通过CD47,PD-L1和B2M等"不要吃我"信号逃避巨细胞的清除.
- 针对这些信号的现有抗体疗法显示出不同的反应,这表明存在其他免疫逃避机制.
研究的目的:
- 鉴定癌症免疫规避中涉及的新型"不要吃我"信号.
- 研究CD24作为卵巢和乳腺癌的潜在治疗点的作用.
- 探索瘤表达的CD24和巨受体之间的相互作用.
主要方法:
- 在瘤相关的巨细胞和癌细胞中分析CD24和Siglec-10表达.
- 在临床前模型中对CD24和Siglec-10进行基因切除.
- 使用单克隆抗体阻止CD24- Siglec-10相互作用的体外和体内实验.
- 评估巨细胞灭菌,瘤生长和存活率.
主要成果:
- 在卵巢和乳腺癌中,瘤表达的CD24被确定为主导的先天免疫检查点.
- 在与瘤相关的巨细胞上,CD24与酸结合的Ig-like lectin 10 (Siglec-10) 相互作用,抑制细胞化.
- 基因或抗体介导的CD24-Siglec-10轴阻断强烈增强了瘤细胞的化,并减少了瘤体内的生长.
- 治疗CD24阻断导致巨细胞依赖的瘤减少和生存率增加.
结论:
- 在多种癌症中,CD24作为关键的抗细胞信号,促进免疫逃避.
- 向CD24-Siglec-10相互作用是一个有前途的新型免疫治疗策略,用于卵巢和乳腺癌.
- 在这些致命的恶性瘤中,CD24阻塞可以克服免疫抵抗并改善治疗结果.
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