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Loss of canonical splicing factor SRSF1 in hepatocytes results in acute liver injury and regeneration

ABSTRACT: Post-transcriptional gene regulatory mechanisms (PTGRM) contribute profoundly to liver development and physiology. Alternative splicing is one of the earliest mechanisms of gene regulation acting on nascently transcribed mRNA. This process is mediated by a large class of proteins known as splicing factors. SRSF1 is a canonical splicing factor with roles in both constitutive and alternative splicing. While its biochemical activities have been studied extensively, its role in tissue physiology are not well defined. In this study we investigate the role of SRSF1 in liver physiology using hepatocyte-specific knock-out mice models. Hepatocyte-specific knock-out of SRSF1 was achieved in two ways; 1) SRSF1 floxed mice were crossed with AlbCre transgenic mice and 2) SRSF1 floxed mice were injected with AAV8-TBG-iCre viral vector. The latter model allowed for investigating acute changes in hepatocyte upon ablation of SRSF1. Both models exhibit acute liver injury with severe cellular damage, inflammation and lipid accumulation. Utilizing high-throughput transcriptome profiling on purified hepatocytes, we find acute loss of SRSF1 triggers activation of the p53 pathway and splicing dysregulation of genes involved in mRNA metabolism. Continuous hepatic injury in this model eventually triggers a regenerative response resulting in the upregulation of genes involved in proliferation and repopulation of the tissue parenchyma.

ORGANISM(S): Mus musculus

PROVIDER: GSE147005 | GEO | 2021/03/31

REPOSITORIES: GEO

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Project description:We previously showed that severe liver diseases are characterized by expansion of liver progenitor cells (LPC), which correlates with disease severity. However, the origin and role of LPC in liver physiology and in the hepatic response to injury remains a contentious topic. We have now used genetic lineage tracing of Hnf1Î²-expressing biliary duct cells to assess their contribution to LPC expansion and hepatocyte generation during normal liver homeostasis, and following different types of liver injury. We found that ductular reaction cells in human cirrhotic livers express HNF1Î². However, HNF1Î² expression was not present in newly generated EpCAM-positive hepatocytes. Using a tamoxifen-inducible Hnf1Î²CreER/R26RYFP/LacZ mouse, we show that there is no contribution of the biliary epithelium to hepatocyte turnover during liver homeostasis in healthy mice. Moreover, after loss of liver mass, Hnf1Î²+ LPC did not contribute to hepatocyte regeneration. We also assessed the contribution of Hnf1Î²+ cells following acute and repeated liver injury. All animal models showed expansion of LPC, as assessed by immunostaining and gene expression profile of sorted YFP-positive cells. A contribution of Hnf1Î²+ LPC to hepatocyte generation was not detected in animal models of liver injury with preserved hepatocyte regenerative potential such as acute acetaminophen, carbon tetrachloride injury, or chronic diethoxycarbonyl-1,4-dihydro-collidin (DDC)-diet. However, in mice fed with choline-deficient ethionine-supplemented (CDE)-diet, which causes profound hepatocyte damage and arrest, a small number of hepatocytes were derived from Hnf1Î²+ cells. Conclusion: Hnf1Î²+ cells do not participate in hepatocyte turnover in the healthy liver or during liver regeneration after partial hepatectomy. After liver injury, LPC arise from the biliary duct epithelium, which gives rise to a limited number of hepatocytes only when hepatocyte regeneration is compromised. Transcriptomic profile using MoGeneST-2.0 chip from 3 samples of YFP+ CDE, 3 samples of YFP+ DDC, 2 samples of YFP+ UTR and 3 samples YFP-

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Loss of canonical splicing factor SRSF1 in hepatocytes results in acute liver injury and regeneration

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