Recombinant immunotoxin induces tumor intrinsic STING signaling against head and neck squamous cell carcinoma.

Recombinant immunotoxin induces tumor intrinsic STING signaling against head and neck squamous cell carcinoma.
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DOI:
10.1038/s41598-023-45797-7
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发表时间:
2023-10-28
期刊:
影响因子:
4.6
通讯作者:
Gu, Xinbin
Gu, Xinbin
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xie, Guiqin;Shan, Liang;Yang, Cuicui;Liu, Yuanyi;Pang, Xiaowu;Teng, Shaolei;Wu, Tzyy-Choou;Gu, Xinbin

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干扰素基因先天免疫刺激剂 (STING) 途径已知可激活 I 型干扰素 (IFN-I) 并参与产生抗肿瘤免疫。我们之前生产了hDT806,一种重组白喉免疫毒素,并证明了其对抗头颈鳞状细胞癌(HNSCC)的功效。然而,尚不清楚肿瘤固有的 STING 是否在 hDT806 的抗 HNSCC 作用中发挥作用。在这项研究中,我们研究了 hDT806 对 HNSCC 的先天免疫调节作用。 hDT806 显着上调 HNSCC 细胞中 STING 的水平以及 p-TBK1/TBK1 的比率。此外,瘤内hDT806治疗增加了HNSCC异种移植物中STING-IFN-I信号蛋白的表达,包括IFNA1、IFNB、CXCL10和MX1(IFN-I受体活性的标志物)。 STING 的过表达模仿了 hDT806 诱导的 STING-IFN-I 信号上调,并诱导 HNSCC 细胞凋亡。在 STING 过表达的小鼠 HNSCC 异种移植模型中,与没有 STING 过表达的对照异种移植模型相比,我们观察到肿瘤生长显着受到抑制,肿瘤重量减轻,细胞凋亡增加。总的来说,我们的数据表明 hDT806 可能作为肿瘤固有的 STING-IFN-I 信号传导的刺激剂来抑制 HNSCC 中的肿瘤生长。
The innate immune stimulator of interferon genes (STING) pathway is known to activate type I interferons (IFN-I) and participate in generating antitumor immunity. We previously produced hDT806, a recombinant diphtheria immunotoxin, and demonstrated its efficacy against head and neck squamous cell carcinoma (HNSCC). However, it’s unknown whether the tumor-intrinsic STING plays a role in the anti-HNSCC effects of hDT806. In this study, we investigated the innate immune modulation of hDT806 on HNSCC. hDT806 significantly upregulated the level of STING and the ratio of p-TBK1/TBK1 in the HNSCC cells. Moreover, intratumoral hDT806 treatment increased the expression of STING-IFN-I signaling proteins including IFNA1, IFNB, CXCL10 and MX1, a marker of IFN-I receptor activity, in the HNSCC xenografts. Overexpression of STING mimicked the hDT806-induced upregulation of the STING-IFN-I signaling and induced apoptosis in the HNSCC cells. In the mouse xenograft models of HNSCC with STING overexpression, we observed a significant suppression of tumor growth and reduced tumor weight with increased apoptosis compared to their control xenograft counterparts without STING overexpression. Collectively, our data revealed that hDT806 may act as a stimulator of tumor-intrinsic STING-IFN-I signaling to inhibit tumor growth in HNSCC.
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