RNF43 p.G659fs 通过 PI3K/AKT/mTOR 信号通路和 HLA-E 上调导致 MSI-high 结直肠癌中 NK 细胞功能障碍
RNF43 p.G659fs leads to natural killer cell dysfunction in MSI-high colorectal cancer through PI3K/AKT/mTOR signaling and HLA-E up-regulation.
CELL INTELLIGENCE · 肿瘤细胞治疗研究
肿瘤细胞治疗研究
英文原题:Dual-functioning Targeted ADAM17 Blocker CD16 (TAB16) mediates selective ADAM17 inhibition in NK cells and engages overexpressed ADAM17 in tumor cells to induce cytotoxicity.
Dual-functioning Targeted ADAM17 Blocker CD16 (TAB16) mediates selective ADAM17 inhibition in NK cells and engages overexpressed ADAM17 in tumor cells to induce cytotoxicity.
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我们的 ADAM17 结合平台提供了一种独特的方法,用于靶向抑制 ADAM17,以增强内源性和治疗性 NK 细胞的抗肿瘤功能。
自然杀伤(NK)细胞是先天淋巴细胞,通过自然细胞毒性和抗体依赖性细胞介导的细胞毒性(ADCC)杀伤肿瘤细胞。人类 NK 细胞仅通过 IgG Fc 受体 CD16(FcγRIIIA)介导后一过程。该活化受体的细胞表面水平受到金属蛋白酶 ADAM17 的严格调控,ADAM17 在 NK 细胞活化或细胞应激时切割 CD16。我们曾报道,Medi-1 是一种全人源 IgG1 mAb,可阻断 ADAM17,同时其 Fc 区域被 CD16 结合,从而诱导并延长其信号传导,并与细胞因子刺激(如 IL-15)产生协同作用。为了利用 Medi-1 的这些独特特征,同时解决该 mAb 的局限性,例如由于受体多态性导致 CD16 与其结合的亲和力各异,以及广泛阻断 ADAM17 活性的风险,我们设计了靶向 ADAM17 阻断剂 CD16(TAB16)。
TAB16是通过将特异性针对CD16的骆驼重链可变域与源自Medi-1的单链可变片段连接而生成的。TAB16通过连接IL-15部分进一步修饰,生成TAB16/15。原代人NK细胞用TAB16或TAB16/15处理,并通过细胞稀释染料评估增殖、ADAM17阻断、激活标志物表达,以及通过IncuCyte实时测定对卵巢癌细胞系的细胞毒性。
TAB16双特异性衔接器靶向NK细胞并阻断ADAM17。TAB16的一个新特点是其双重功能,因为它与IL-15协同作用以增强NK细胞活化和增殖,并靶向癌细胞上过表达的ADAM17以诱导ADCC。TAB16是一个可修饰的骨架,可以添加额外的功能组件,如IL-15(TAB16/15),以实现巩固和多方面的活性。
TAB16 was generated with a camelid heavy-chain variable domain specific to CD16 linked to a single-chain variable fragment derived from Medi-1. TAB16 was further modified by the linkage of an IL-15 moiety to generate TAB16/15. Primary human NK cells were treated with TAB16 or TAB16/15 and evaluated for proliferation by cell dilution dye, ADAM17 blocking, activation marker expression, and cytotoxicity against ovarian cancer cell lines in real-time by IncuCyte assays.
The TAB16 bispecific engager targeted NK cells and blocked ADAM17. A novel feature of TAB16 is its dual functionality, as it synergizes with IL-15 to enhance NK cell activation and proliferation and targets ADAM17 overexpressed on cancer cells to induce ADCC. TAB16 is a modifiable backbone to which additional functional components can be added, such as IL-15 (TAB16/15) for consolidated and multifaceted activity. DISCUSSION: Our ADAM17-engaging platform offers a unique approach for targeted ADAM17 inhibition to augment the anti-tumor function of endogenous and therapeutic NK cells.
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