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鉴定低氧诱导因子 HIF-1A 作为急性肺损伤期间 A2B 腺苷受体的转录调节因子。

Identification of hypoxia-inducible factor HIF-1A as transcriptional regulator of the A2B adenosine receptor during acute lung injury.

机构信息

Mucosal Inflammation Program, Department of Anesthesiology, University of Colorado, Aurora, CO 80045.

出版信息

J Immunol. 2014 Feb 1;192(3):1249-56. doi: 10.4049/jimmunol.1100593. Epub 2014 Jan 3.

Abstract

Although acute lung injury (ALI) contributes significantly to critical illness, resolution often occurs spontaneously through endogenous pathways. We recently found that mechanical ventilation increases levels of pulmonary adenosine, a signaling molecule known to attenuate lung inflammation. In this study, we hypothesized a contribution of transcriptionally controlled pathways to pulmonary adenosine receptor (ADOR) signaling during ALI. We gained initial insight from microarray analysis of pulmonary epithelia exposed to conditions of cyclic mechanical stretch, a mimic for ventilation-induced lung disease. Surprisingly, these studies revealed a selective induction of the ADORA2B. Using real-time RT-PCR and Western blotting, we confirmed an up to 9-fold induction of the ADORA2B following cyclic mechanical stretch (A549, Calu-3, or human primary alveolar epithelial cells). Studies using ADORA2B promoter constructs identified a prominent region within the ADORA2B promoter conveying stretch responsiveness. This region of the promoter contained a binding site for the transcription factor hypoxia-inducible factor (HIF)-1. Additional studies using site-directed mutagenesis or transcription factor binding assays demonstrated a functional role for HIF-1 in stretch-induced increases of ADORA2B expression. Moreover, studies of ventilator-induced lung injury revealed induction of the ADORA2B during ALI in vivo that was abolished following HIF inhibition or genetic deletion of Hif1a. Together, these studies implicate HIF in the transcriptional control of pulmonary adenosine signaling during ALI.

摘要

尽管急性肺损伤 (ALI) 对危重病有重大贡献,但通过内源性途径,其通常会自发恢复。我们最近发现,机械通气会增加肺腺苷的水平,而肺腺苷是一种已知可减轻肺部炎症的信号分子。在这项研究中,我们假设转录控制途径对 ALI 期间肺腺苷受体 (ADOR) 信号转导有贡献。我们通过对暴露于周期性机械拉伸条件下的肺上皮细胞进行微阵列分析,初步获得了一些见解,这是一种模拟通气引起的肺部疾病的方法。令人惊讶的是,这些研究揭示了 ADORA2B 的选择性诱导。通过实时 RT-PCR 和 Western blot 分析,我们证实了周期性机械拉伸(A549、Calu-3 或人原代肺泡上皮细胞)后 ADORA2B 的诱导高达 9 倍。使用 ADORA2B 启动子构建体的研究确定了 ADORA2B 启动子内一个传递拉伸反应性的重要区域。该启动子区域包含转录因子缺氧诱导因子 (HIF)-1 的结合位点。使用定点诱变或转录因子结合测定的进一步研究表明,HIF-1 在拉伸诱导的 ADORA2B 表达增加中具有功能作用。此外,对呼吸机诱导的肺损伤的研究表明,ADORA2B 在体内 ALI 期间被诱导,而在 HIF 抑制或 Hif1a 基因缺失后则被消除。总之,这些研究表明 HIF 参与了 ALI 期间肺腺苷信号的转录控制。

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