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Nat Biotech:对抗实体肿瘤,研究者发现CAR巨噬细胞新疗法!

2020-03-25 生物探索 生物探索

近几年,嵌合抗原受体(Chimericantigen receptor, CAR) T细胞疗法在血液恶性肿瘤治疗方面取得了很好疗效,但将该技术应用于实体恶性肿瘤却面临许多挑战

近几年,嵌合抗原受体(Chimericantigen receptor, CAR) T细胞疗法在血液恶性肿瘤治疗方面取得了很好疗效,但将该技术应用于实体恶性肿瘤却面临许多挑战。而日前,《Nature biotechnology》期刊报道了一种新的疗法——CAR 巨噬细胞(CAR macrophages,CAR-Ms),即用CAR手段编辑人体巨噬细胞,使其可以直接吞噬肿瘤。该研究由宾夕法尼亚大学佩勒曼医学院的研究者们完成。


doi.org/10.1038/s41587-020-0462-y

肿瘤相关巨噬细胞(tumorassociated macrophages,TAMs)广泛存在于实体瘤微环境(tumor microenvironment, TME)中,具有吞噬和杀灭病原体、处理并提呈抗原等重要作用。鉴于TAMs独特的效应功能和穿透肿瘤的能力,研究者利用CARs生物技术改造人体巨噬细胞,使它们的吞噬活性直接作用于肿瘤。

首先,研究者选用一种嵌合的腺病毒载体Ad5f35,它可以克服人体巨噬细胞对遗传操作的固有抵抗力,并具有持续的促炎症(M1)表型。通过将anti-HER2 CAR导入该载体中,然后把该病毒载体插入巨噬细胞,体外试验结果显示,这些CAR-Ms不仅能高表达CAR,还能转化为高度炎症细胞以抵抗肿瘤侵袭。


抗her2的CAR-Ms在异种移植模型中的抗肿瘤活性、持久性和转运评价

之后,在两种实体瘤异种移植小鼠模型中评估CAR-Ms活性,发现单次注射人源Car-Ms可减轻肿瘤症状,延长整体存活时间。同时,CAR-Ms可以表达促炎细胞因子和趋化因子,将附近M2巨噬细胞转化为M1,上调抗原呈递机制,募集抗原并向T细胞呈递,抵抗免疫抑制因子。

这项研究的第一作者Michael Klichinsky指出,在人源化小鼠模型中,CAR-Ms可以进一步诱导促炎性肿瘤的微环境,增强抗肿瘤T细胞的活性,这个新发现相比于细胞疗法本身有更深远的影响,未来将努力更好地利用它来治愈癌症。

原始出处:

Michael Klichinsky, Marco Ruella, Saar Gill, et.al. Human chimeric antigen receptor macrophages for cancer immunotherapy. Nature Biotechnology 23 March 2020

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    2020-03-27 shock_melon
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    2020-11-16 sunylz
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    2020-05-19 wuzhiqiang1006

    学习了

    0

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    2021-02-24 liye789132251
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    2020-09-07 stfoxst
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    2020-03-27 kcb074

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