Chromatin accessibility dynamics dictate renal tubular epithelial cell response to injury.

Chromatin accessibility dynamics dictate renal tubular epithelial cell response to injury.
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DOI:
10.1038/s41467-022-34854-w
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发表时间:
2022-11-28
影响因子:
16.6
通讯作者:
Zhang L
Zhang L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Cao X;Wang J;Zhang T;Liu Z;Liu L;Chen Y;Li Z;Zhao Y;Yu Q;Liu T;Nie J;Niu Y;Chen Y;Yang L;Zhang L

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肾小管上皮细胞(TEC)可以启动适应性反应,从轻度急性肾损伤(阿基)中完全恢复,而严重损伤通常会导致持续的适应不良修复和肾纤维化的进展。通过ATAC-seq分析活性DNA调控元件,我们揭示了缺血再灌注损伤后TEC染色质可及性的广泛动态变化。我们发现,损伤特异性结构域的调控染色质成为基因激活之前,创造平衡的染色质状态,激活随之而来的基因表达程序和损伤反应。我们进一步确定RXRα是促进适应性修复的关键转录因子。贝沙罗汀(一种FDA批准的RXRα激动剂)激活RXRα可恢复染色质状态和基因表达程序,以保护TEC免受严重肾损伤。总之,我们的研究结果阐明了染色质介导的机制,这些机制是TEC对不同损伤的不同反应的基础,并将RXRα确定为急性肾损伤的治疗靶点。肾小管上皮细胞(TEC)在不同程度的损伤后可以启动适应性或适应不良反应。在这里,作者阐明了染色质介导的机制,潜在的TEC的反应,以不同的肾损伤。
Renal tubular epithelial cells (TECs) can initiate an adaptive response to completely recover from mild acute kidney injury (AKI), whereas severe injury often leads to persistence of maladaptive repair and progression to kidney fibrosis. Through profiling of active DNA regulatory elements by ATAC-seq, we reveal widespread, dynamic changes in the chromatin accessibility of TECs after ischemia–reperfusion injury. We show that injury-specific domains of regulatory chromatin become accessible prior to gene activation, creating poised chromatin states to activate the consequent gene expression program and injury response. We further identify RXRα as a key transcription factor in promoting adaptive repair. Activation of RXRα by bexarotene, an FDA-approved RXRα agonist, restores the chromatin state and gene expression program to protect TECs against severe kidney injury. Together, our findings elucidate a chromatin-mediated mechanism underlying differential responses of TECs to varying injuries and identify RXRα as a therapeutic target of acute kidney injury. Renal tubular epithelial cells (TECs) can initiate an adaptive or maladaptive response after injuries of different severity. Here, the authors elucidate a chromatin-mediated mechanism underlying the responses of TECs to varying kidney injuries.
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