Blood:Epo刺激T细胞可增强过继性T细胞疗法的抗肿瘤活性

2019-11-01 一刀 MedSci原创

在癌症的过继性T细胞免疫疗法中,效应细胞的扩增和持续存在是反应的关键决定因素。目前,尚不明确T淋巴细胞是否可通过其异位表达的野生型受体或可增强红细胞前体Epo信号的截断体(EpoRm)对促红细胞生成素(Epo)敏感,Vinanica等人对此进行研究。

中心点:

促红细胞生成素受体或功能更强的突变体(EpoRm)的表达可促进T细胞存活和增殖。

EpoRm表达使CAR-T细胞具有较好的抗肿瘤活性,该方法或可用于其它过继性T细胞疗法。

摘要:

在癌症的过继性T细胞免疫疗法中,效应细胞的扩增和持续存在是反应的关键决定因素。目前,尚不明确T淋巴细胞是否可通过其异位表达的野生型受体或可增强红细胞前体Epo信号的截断体(EpoRm)对促红细胞生成素(Epo)敏感,Vinanica等人对此进行研究。

两种受体均可在人T淋巴细胞上表达;Epo可诱导STAT5磷酸化,该效果可被JAK1/2抑制剂鲁索替尼的非毒性浓度所消除。与野生型相比,EpoRm具有更高的表达水平和更强的刺激作用,包括对T细胞生存和增殖的促进作用更强。

利用双离子载体,我们将EpoRm与抗CD19-41BB-CD3z嵌合抗原受体(CAR)一起表达,同时保证每个受体的功能正常。Epo存在时,EpoRm-CAR-T细胞比CAR-T细胞的体外扩增更强,长期培养时可更有效地杀死CD19+白血病细胞。在免疫缺陷小鼠中,生理水平的小鼠Epo足以优先扩增EpoRm-CAR-T细胞,产生明显更强的抗白血病活性。

因此,用EpoRm装备过继性T细胞,在输注的细胞数量较少的情况下,也能产生较强的效应靶向率;予以Epo或鲁索替尼可调节输注后的EpoRm-CAR-T细胞水平,从而最大限度地增强抗肿瘤活性、降低毒性。

原始出处:


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