Ataxin-10 Inhibits TNF-α-Induced Endothelial Inflammation via Suppressing Interferon Regulatory Factor-1.

Ataxin-10 Inhibits TNF-α-Induced Endothelial Inflammation via Suppressing Interferon Regulatory Factor-1.
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Ataxin-10 通过抑制干扰素调节因子 1 抑制 TNF-α 诱导的内皮炎症。

DOI:
10.1155/2021/7042148
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发表时间:
2021
影响因子:
4.6
通讯作者:
Huang X
Huang X
中科院分区:
医学3区
文献类型:
--
作者:
Li Y;Zhang Q;Li N;Ding L;Yi J;Xiao Y;Chen S;Huang X

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内皮炎症是动脉粥样硬化起始的关键事件。在这里,我们通过抑制 IRF-1 转录活性将 Ataxin-10 蛋白确定为一种新型内皮激活负调节剂。 Ataxin-10在人血管内皮细胞中的蛋白水平相对较高,在HUVEC和HLMEC中均可被TNF-α显着抑制。 Ataxin-10 的过表达显着抑制 VCAM-1 和多种细胞因子(包括 MCP-1、CXCL-1、CCL-5 和 TNF-α)的 mRNA 表达;因此,它还可以抑制单核细胞与内皮细胞的粘附。因此,Ataxin-10 沉默促进了内皮炎症。然而,Ataxin-10 并不影响 HUVEC 中 TNF-α 刺激的 MAPK/NF-κB 信号通路。使用酵母二杂交实验,我们发现Ataxin-10可以直接与干扰素调节因子-1(IRF-1)结合。在 TNF-α 刺激下,Ataxin-10 促进 IRF-1 的细胞质定位,从而抑制 VCAM-1 的转录。此外,敲低IRF-1可以消除Ataxin-10对TNF-α诱导的HUVEC中VCAM-1表达的影响。综上所述,这些结果表明 Ataxin-10 抑制内皮细胞活化,可能作为动脉粥样硬化等一些血管炎症相关疾病的有希望的治疗靶点。
Endothelial inflammation is a crucial event in the initiation of atherosclerosis. Here, we identify Ataxin-10 protein as a novel negative modulator of endothelial activation by suppressing IRF-1 transcription activity. The protein level of Ataxin-10 is relatively higher in human vascular endothelial cells, which can be significantly suppressed by TNF-α in both HUVECs and HLMECs. Overexpression of Ataxin-10 markedly inhibited the mRNA expressions of VCAM-1 and several cytokines including MCP-1, CXCL-1, CCL-5, and TNF-α; thus, it can also suppress monocyte adhesion to endothelial cells. Accordingly, Ataxin-10 silencing promoted endothelial inflammation. However, Ataxin-10 did not affect the MAPK/NF-κB signaling pathway stimulated by TNF-α in HUVECs. Using the yeast two-hybrid assay, we found that Ataxin-10 can directly bind to interferon regulatory factor-1 (IRF-1). Upon TNF-α stimulation, Ataxin-10 promoted the cytoplasmic localization of IRF-1, which inhibited the transcription of VCAM-1. Moreover, knockdown of IRF-1 can eliminate the effect of Ataxin-10 on the expression of VCAM-1 in HUVECs induced by TNF-α. Taken together, these results indicate that Ataxin-10 inhibits endothelial cell activation and may serve as a promising therapeutic target for some vascular inflammatory-related diseases such as atherosclerosis.
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