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LncRNA UCA1 remits LPS ‐engendered inflammatory damage through deactivation of miR ‐499b‐5p/ TLR4 axis
IUBMB Life ( IF 4.6 ) Pub Date : 2020-12-31 , DOI: 10.1002/iub.2443
Yan-Jun Zhao 1 , Yue-E Chen 1 , Hong-Jun Zhang 1 , Xing Gu 1
Affiliation  

Neonatal pneumonia is a high neonatal mortality disease. The current research was designed to elucidate the modulatory function and feasible molecular mechanism of UCA1 in LPS-induced injury in pneumonia. Herein, LPS was applied to induce WI-38 cell inflammatory damage. We displayed that UCA1 was elevated in LPS-injured WI-38 cells. In the functional aspect, intervention of UCA1 evidently aggrandized cell viability in LPS-triggered WI-38 cells. In the meanwhile, elimination of UCA1 distinctly assuaged cell apoptosis concomitant with declined levels of proapoptotic proteins Bax and C-caspase-3, and ascended the expression of antiapoptotic protein Bcl-2. Subsequently, disruption of UCA1 manifestly restrained inflammatory damage as characterized by declination of multiple pro-inflammatory factors IL-1β, IL-6 and TNF-α in WI-38 cells under LPS circumstance. More importantly, we predicted and verified that UCA1 functioned as a ceRNA by efficaciously binding to miR-499b-5p thereby inversely adjusting miR-499b-5p expression. Interesting, TLR4 was identified as direct target of miR-499b-5p, and positively regulated by UCA1 through sponging miR-499b-5p. Mechanistically, absence of miR-499b-5p or restoration of TLR4 impeded the beneficial effects of UCA1 ablation on LPS-stimulated apoptosis and inflammatory response. Collectively, these observations illuminated that UCA1 inhibition protected WI-38 cells against LPS-managed inflammatory injury and apoptosis process via miR-499b-5p/TLR4 crosstalk, which ultimately influencing the development of pneumonia. This article is protected by copyright. All rights reserved.

中文翻译:

LncRNA UCA1 通过 miR-499b-5p/TLR4 轴的失活缓解 LPS 引起的炎症损伤

新生儿肺炎是一种新生儿死亡率高的疾病。目前的研究旨在阐明UCA1在LPS诱导的肺炎损伤中的调节功能和可行的分子机制。在此,LPS 被用于诱导 WI-38 细胞炎症损伤。我们显示 UCA1 在 LPS 损伤的 WI-38 细胞中升高。在功能方面,UCA1 的干预明显增强了 LPS 触发的 WI-38 细胞中的细胞活力。同时,UCA1的消除明显抑制了细胞凋亡,伴随着促凋亡蛋白Bax和C-caspase-3水平的下降,并提高了抗凋亡蛋白Bcl-2的表达。随后,UCA1 的破坏明显抑制了炎症损伤,其特征是多种促炎因子 IL-1β 的下降,LPS 条件下 WI-38 细胞中的 IL-6 和 TNF-α。更重要的是,我们预测并验证了 UCA1 通过与 miR-499b-5p 有效结合从而反向调节 miR-499b-5p 表达来发挥 ceRNA 的作用。有趣的是,TLR4 被确定为 miR-499b-5p 的直接靶标,并通过 miR-499b-5p 受到 UCA1 的正向调节。从机制上讲,miR-499b-5p 的缺失或 TLR4 的恢复阻碍了 UCA1 消融对 LPS 刺激的细胞凋亡和炎症反应的有益作用。总的来说,这些观察结果表明,UCA1 抑制通过 miR-499b-5p/TLR4 串扰保护 WI-38 细胞免受 LPS 管理的炎症损伤和细胞凋亡过程,最终影响肺炎的发展。本文受版权保护。版权所有。我们预测并验证了 UCA1 通过有效结合 miR-499b-5p 发挥 ceRNA 的作用,从而反向调节 miR-499b-5p 的表达。有趣的是,TLR4 被确定为 miR-499b-5p 的直接靶标,并通过 miR-499b-5p 受到 UCA1 的正向调节。从机制上讲,miR-499b-5p 的缺失或 TLR4 的恢复阻碍了 UCA1 消融对 LPS 刺激的细胞凋亡和炎症反应的有益作用。总的来说,这些观察结果表明,UCA1 抑制通过 miR-499b-5p/TLR4 串扰保护 WI-38 细胞免受 LPS 管理的炎症损伤和细胞凋亡过程,最终影响肺炎的发展。本文受版权保护。版权所有。我们预测并验证了 UCA1 通过有效结合 miR-499b-5p 发挥 ceRNA 的作用,从而反向调节 miR-499b-5p 的表达。有趣的是,TLR4 被确定为 miR-499b-5p 的直接靶标,并通过 miR-499b-5p 受到 UCA1 的正向调节。从机制上讲,miR-499b-5p 的缺失或 TLR4 的恢复阻碍了 UCA1 消融对 LPS 刺激的细胞凋亡和炎症反应的有益作用。总的来说,这些观察结果表明,UCA1 抑制通过 miR-499b-5p/TLR4 串扰保护 WI-38 细胞免受 LPS 管理的炎症损伤和细胞凋亡过程,最终影响肺炎的发展。本文受版权保护。版权所有。
更新日期:2020-12-31
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