Immunity:新的anti-CD25抗体,使抑制肿瘤内的Treg细胞的免疫疗法重获生机

2017-04-17 MedSci MedSci原创

接着研究组改良了原来的anti-CD25 r1抗体,使其能更好的结合起作用的I,III,IV型Fc gamma受体,结果改良后的抗体相较于原来的抗体能够更好的杀死肿瘤组织中的Treg细胞。并且如果搭配使用时下刚被美国FDA批准使用的anti-PD-L1抗体使用,能够起到加成的作用。即杀死了肿瘤中的Treg细胞,同时又使原来疲惫的Teff细胞重新恢复活性。 这项研究使本来已经失去研究重心的an

基于机体自身的免疫系统杀死癌细胞成为时下流行的新的癌症治疗方向。在肿瘤组织中浸润了大量的T细胞,具有杀死癌细胞的潜能。然而同时在肿瘤组织中也存在着抑制T细胞功能的调节性T(Treg)细胞,从而掩护了癌细胞的生长。如何有效的抑制Treg细胞并且激活原有的功能性T(Teff)细胞成为摆在癌症研究道路上的长久障碍。尽管已经有了非常好的抗体(anti-CD25 r1)能够特异性杀死Treg细胞,但是在实际临床试验中,被杀死的大多数是外周血内的Treg细胞而不是肿瘤细胞内的Treg细胞,也应此这一靶向疗法的可行性抑制饱受争议。

在最新上线的Immunity杂志中,来自英国University College London Hospital的Frederick Arce Vargas及其同事发现传统的去除Treg细胞的抗体anti-CD25之所以不能有效的抑制肿瘤内的Treg细胞是因为肿瘤内的单核细胞(monocytes)或者巨噬细胞(macrophages)高表达抑制其功能的Fc gamma受体IIb。

由于之前针对Treg细胞的anti-CD25 r1抗体在临床上的效果有限,人们推测:可能是因为CD25蛋白在肿瘤中Treg细胞的表达量比较低,亦或者是原有的Teff细胞也表达CD25蛋白,所以导致anti-CD25 r1抗体不能很好的控制肿瘤。但是研究组首先证明,相对于外周血和淋巴结内的Treg细胞,肿瘤组织中的Treg细胞表达更多的CD25。并且在肿瘤组织中,几乎是Treg细胞主要表达CD25蛋白。推翻了之前的假设。那么为什么anti-CD25 r1抗体不能杀死肿瘤内的Treg细胞呢?

研究组接着发现,anti-CD25 r1抗体杀死的几乎都是外周的Treg细胞。因为anti-CD25 r1杀死Treg细胞需要结合单核细胞(monocytes)或者巨噬细胞(macrophages)上起激活功能的I,III,IV型Fc gamma受体,从而引导单核细胞或者巨噬细胞吞噬表达CD25的Treg。然而肿瘤内的单核细胞或者巨噬细胞相比表达更多的起抑制功能的II型Fc gamma受体。而且这一受体相较于I,III,IV型Fc gamma受体,结合anti-CD25 r1抗体的亲和力更强,从而抑制了抗体杀死细胞的能力。

接着研究组改良了原来的anti-CD25 r1抗体,使其能更好的结合起作用的I,III,IV型Fc gamma受体,结果改良后的抗体相较于原来的抗体能够更好的杀死肿瘤组织中的Treg细胞。并且如果搭配使用时下刚被美国FDA批准使用的anti-PD-L1抗体使用,能够起到加成的作用。即杀死了肿瘤中的Treg细胞,同时又使原来疲惫的Teff细胞重新恢复活性。

这项研究使本来已经失去研究重心的anti-CD25疗法重新获得了活力,为开发新的疗法提供了思路。

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    2017-07-07 陈吴1234
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