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IRE1 inhibitor [RNA-seq]

ABSTRACT: The role of the unfolded protein response (UPR) in the cellular innate response to RSV infection is not fully understood. To better the genomic targets for the IRE1-XBP1 pathway, RNA seq was conducted on RSV-infected small airway cells in the absence or presence of RSV infection and in the absence or presence of a selective IRE1a RNAse inhibitor. We identified expression changes in ~3.2K genes; of these, 279 required IRE1 and were enriched in IL-10 signaling and cytokine signaling pathways. These data indicate that IRE1a-XBP1s regulates genes important in epithelial mesenchymal transition, hexosamine biosynthesis and anti-viral signaling.

ORGANISM(S): Homo sapiens

PROVIDER: GSE228327 | GEO | 2023/04/30

REPOSITORIES: GEO

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Project description:This experiment was conducted to identify mRNA transcripts alteration in liver of Ern1 liver specific knockout mice. The following abstract from the submitted manuscript describes the major findings of this work. The IRE1a-XBP1s axis regulates the COPII-mediated secretory program in response to nutrient availability. Lin Liu, Jie Cai, Xijun Liang, Qian Zhou, Huimin Wang, Chenyun Ding, Yuangang Zhu, Liwei Xiao, Tingting Fu, Zhisheng Xu, Jing Liu, Yujing Yin, Lei Fang, Bin Xue, Yan Wang, Aibin He, Yong Liu, Xiao-Wei Chen, and Zhenji Gan The cytoplasmic coat protein complex-II (COPII) is an evolutionarily conserved machinery that is essential for efficient trafficking of protein and lipid cargos. How the COPII machinery is regulated to meet the metabolic demand in response to alterations of nutritional state remains largely unexplored, however. Here, we show that dynamic changes of COPII-mediated secretion parallel the activation of XBP1s, the critical transcription factor in handling cellular ER stress, in both live cells and mouse liver upon physiological fluctuations of nutrient availability. Using live-cell imaging approaches, we demonstrate that XBP1s is sufficient to promote COPII-dependent secretion, mediating the nutrient stimulatory effects. ChIP-seq and RNA-seq analyses reveal that nutritional signals induce dynamic XBP1s occupancy of promoters of COPII secretion-related genes, thereby driving COPII-directed secretory process. Liver-specific disruption of the IRE1a-XBP1s signaling branch results in diminished COPII-mediated secretion. Reactivation of XBP1s in mice lacking hepatic IRE1a restores COPII-mediated lipoprotein secretion, and reverses the fatty liver and hypolipidemia phenotypes. Thus, our results demonstrate a previously unappreciated mechanism in the metabolic control of liver protein and lipid secretion: the IRE1a-XBP1s axis functions as a nutrient-sensing regulatory nexus that integrates nutritional states and the COPII secretory program.

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IRE1 inhibitor [RNA-seq]

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