Apr 24, 2020

Hepatocyte-specific deletion of XBP1 sensitizes mice to liver injury through hyperactivation of IRE1α

BioRxiv : the Preprint Server for Biology
C. C. DuwaertsJacquelyn J Maher


X-box binding protein-1 (XBP1) is a transcription factor that plays a central role in controlling cellular responses to endoplasmic reticulum (ER) stress. Under stress conditions, the transcriptionally active form of XBP1 is generated by unique splicing of Xbp1 mRNA by the ER-resident protein inositol-requiring enzyme-1 (IRE1). Genetic deletion of XBP1 has multiple consequences: some resulting from the loss of the transcription factor per se, and others related to compensatory upstream activation of IRE1. The objective of the current study was to investigate the effects of XBP1 deletion in adult mouse liver and determine to what extent they are direct or indirect. XBP1 was deleted specifically from hepatocytes in adult Xbp1fl/fl mice using AAV8-Transthyretin-Cre (Xbp1{Delta}hep). Xbp1{Delta}hep mice exhibited no liver disease at baseline, but developed acute biochemical and histologic liver injury in response to a dietary challenge with fructose for 4 wk. Fructose-mediated liver injury in Xbp1{Delta}hep mice coincided with heightened IRE1 activity, as demonstrated by cJun phosphorylation and regulated IRE1 -dependent RNA decay (RIDD). Activation of eIF2 was also evident, with associated up-regulation of the pro-apoptotic molecu...Continue Reading

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