探测先天免疫,cGAS蛋白,以及我们自身受损的DNA
![Inhibition of human and mouse cGAS with RU.521 reduces interferon expression in multiple cell types. Lines used were: THP-1 and its derivatives (a–c), RAW 267.4 (d), and HEK293 (e–g) cells. THP-1 KO-cGAS cells were transfected with either vector plasmid control or a plasmid containing h-cGAS, and treated with either vehicle (DMSO) or RU.521 (a, left panel). WT THP-1 cells were mock treated (unt) or stimulated with 0.3 µg/mL HT-DNA +/− RU.521, followed by RT-qPCR analysis for IFNB1 expression (a, right panel). An ELISA for human IFNB1 was also performed on THP-1 cells stimulated with HT-DNA +/− RU.521 (0.8 µM) (b). A dose-response curve was generated for RU.521 using immune-activated THP-1 Lucia ISG cells (c). RAW-Lucia ISG KO cGAS cells were transfected with plasmids expressing WT m-cGAS or h-cGAS, and activity was read via luciferase reporter (d). HEK293 cells were transfected with human or mouse cGAS in addition to h-STING, in the presence or absence of RU.521. The RNA levels for IFNB1 and IFIT2 were then measured by RT-qPCR (e,f). Transfection of vector backbone was used to normalize the data. Immunoblot analysis of transfected h-STING, h-cGAS and m-cGAS into HEK293 cells +/− RU.521 shows protein expression is unaltered by addition of the small molecule. GM130 was used to normalize the data (g). The minimum numbers of biological and technical replicates for the assays were three and three, respectively (n = 9). Error bars represent SEM. Asterisks (*) denote P ≤ 0.05 where an unpaired t-test with Welch’s correction was used to compare the results. Credit: <i>Scientific Reports</i> (2020). DOI: 10.1038/s41598-020-64348-y 探究先天免疫](https://scx1.b-cdn.net/csz/news/800a/2020/probinginnat.jpg)
cGAS蛋白通过检测入侵病原体(如细菌和病毒)的DNA,或我们自己受损和定位错误的DNA,在细胞先天免疫中发挥着重要作用。cGAS- sting信号通路的激活产生促炎免疫反应,cGAS的长时间激活可导致狼疮样自身免疫性疾病。
曼纽尔·阿斯卡诺博士和他的同事们先前发现化合物RU.521是小鼠cGAS的抑制剂。他们现在证明RU.521也有效和选择性地抑制人类cGAS在细胞系在人类原代细胞中。他们发现RU.521以剂量依赖的方式抑制cGAS活性,并且不抑制由非dna信号激活的免疫反应。
这项研究发表在5月5日的《纽约时报》上科学报告,验证了RU.521作为评估cGAS-STING信号轴在各种免疫反应中的作用的工具。该化合物还可以作为一种化学支架,用于开发cgas相关自身免疫性疾病的潜在疗法。
进一步探索
更多信息:卡罗琳·怀瑟等人。人cGAS的小分子抑制降低了细胞中cGAMP的总输出和细胞因子的表达,科学报告(2020)。DOI: 10.1038 / s41598 - 020 - 64348 - y
期刊信息:
科学报告
所提供的范德比尔特大学
引用:探测先天免疫,cGAS蛋白,和我们自己受损的DNA(2020, 5月22日)检索自2022年10月27日//www.pyrotek-europe.com/news/2020-05-probing-innate-immunity-cgas-protein.html
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