Endothelial deletion of TBK1 contributes to BRB dysfunction via CXCR4 phosphorylation suppression.

Endothelial deletion of TBK1 contributes to BRB dysfunction via CXCR4 phosphorylation suppression.
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TBK1 的内皮缺失通过抑制 CXCR4 磷酸化导致 BRB 功能障碍

DOI:
10.1038/s41420-022-01222-y
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发表时间:
2022-10-28
影响因子:
7
通讯作者:
Li, Lu
Li, Lu
中科院分区:
医学2区
文献类型:
--
作者:
Zhao, Bowen;Ni, Yueqi;Zhang, Hong;Zhao, Yin;Li, Lu

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血视网膜屏障(BRB)功能障碍已被认为是常见致盲眼病的早期病理特征。内皮细胞间连接的破坏是BRB功能障碍的主要原因,但我们对连接调节的理解仍然有限。在这里,我们证明了内皮特异性TBK1缺失(Tbk1 Δ EC)破坏视网膜血管发育,并诱导血管渗漏。LC-MS/MS蛋白质组学分析用于鉴定TBK1的候选底物。我们发现TBK1与CXCR4相互作用,并且Tbk1 Δ EC视网膜样品中CXCR4-Serine 355(Ser355)的磷酸化水平降低。此外,TBK1介导的CXCR4的Ser355磷酸化在维持内皮连接中发挥了不可或缺的作用。有趣的是,我们还检测到糖尿病视网膜病变样本中TBK1的表达增加,这表明TBK1与疾病之间存在关联。综上所述,这些结果提供了通过TBK1依赖性CXCR4磷酸化调节内皮细胞与细胞连接的机制。
Blood-retinal barrier (BRB) dysfunction has been recognized as an early pathological feature in common eye diseases that cause blindness. The breakdown of endothelial cell-to-cell junctions is the main reason for BRB dysfunction, yet our understanding of junctional modulation remains limited. Here, we demonstrated that endothelial-specific deletion of TBK1 (Tbk1ΔEC) disrupted retinal vascular development, and induced vascular leakage. LC-MS/MS proteomic analysis was used to identify candidate substrates of TBK1. We found that TBK1 interacted with CXCR4, and the phosphorylation level of CXCR4-Serine 355 (Ser355) was decreased in Tbk1ΔEC retina samples. Furthermore, TBK1-mediated phosphorylation of CXCR4 at Ser355 played an indispensable role in maintaining endothelial junctions. Interestingly, we also detected an increased expression of TBK1 in diabetic retinopathy samples, which suggested an association between TBK1 and the disease. Taken together, these results provided insight into the mechanisms involved in the regulation of endothelial cell-to-cell junctions via TBK1-dependent CXCR4 phosphorylation.
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