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Ablation of Foxl1-Cre-labeled hepatic progenitor cells and their descendants impairs recovery of mice from liver injury.

ABSTRACT: Foxl1(+) hepatic progenitor cells (HPCs) differentiate into cholangiocytes and hepatocytes after liver injury. We investigated the requirement for Foxl1(+) HPCs in recovery from liver injury in mice.We developed mice in which we could trace and delete Foxl1-expressing HPCs and their descendants (Foxl1-Cre;Rosa(YFP/iDTR)-inducible diphtheria toxin receptor [iDTR] mice). Foxl1-Cre-negative mice were used as controls. Liver damage was induced in male mice by placing them on choline-deficient, ethionine-supplemented (CDE) diets for 15 days; mice then were placed on normal diets and allowed to recover. Liver damage was induced in female mice by placing them on 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC)-containing diets, followed by a recovery period. Some mice were given injections of diphtheria toxin during the recovery phase to delete Foxl1-Cre-marked HPCs and their descendants. Livers were collected from all mice and analyzed by immunofluorescence, quantitative reverse-transcription polymerase chain reaction, flow cytometry, and histologic analyses.Foxl1-Cre-marked HPCs were required for the development of cholangiocytes and hepatocytes in livers after CDE diet-induced injury. A smaller percentage of yellow fluorescent protein-positive (YFP(+)) hepatocytes contained markers of oxidative stress, DNA damage, or cell death than YFP-negative hepatocytes, indicating that YFP(+) hepatocytes are newly formed cells. Injection of diphtheria toxin deleted YFP(+) cells from Foxl1-Cre;Rosa(YFP/iDTR) mice and prevented the resolution of hepatic steatosis. In mice recovering from DDC diet-induced injury, most cholangiocytes arose from Foxl1-Cre-marked HPCs. Deletion of YFP(+) cells did not alter levels of markers of liver injury or liver function.Based on studies of Foxl1-Cre;Rosa(YFP/iDTR) mice, Foxl1(+) HPCs and/or their descendants are required for the development of cholangiocytes and hepatocytes in liver after CDE diet-induced injury.

SUBMITTER: Shin S

PROVIDER: S-EPMC4387775 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature

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Ablation of Foxl1-Cre-labeled hepatic progenitor cells and their descendants impairs recovery of mice from liver injury.

Shin Soona S Upadhyay Naman N Greenbaum Linda E LE Kaestner Klaus H KH

Gastroenterology 20141005 1

<h4>Background & aims</h4>Foxl1(+) hepatic progenitor cells (HPCs) differentiate into cholangiocytes and hepatocytes after liver injury. We investigated the requirement for Foxl1(+) HPCs in recovery from liver injury in mice.<h4>Methods</h4>We developed mice in which we could trace and delete Foxl1-expressing HPCs and their descendants (Foxl1-Cre;Rosa(YFP/iDTR)-inducible diphtheria toxin receptor [iDTR] mice). Foxl1-Cre-negative mice were used as controls. Liver damage was induced in male mice b ...[more]

PMID: 25286440

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Project description:Accumulation of connective tissue is a typical feature of chronic liver diseases. Decorin, a small leucine-rich proteoglycan, regulates collagen fibrillogenesis during development, and by directly blocking the bioactivity of transforming growth factor-β1 (TGFβ1), it exerts a protective effect against fibrosis. However, no in vivo investigations on the role of decorin in liver have been performed before. In this study we used decorin-null (Dcn-/-) mice to establish the role of decorin in experimental liver fibrosis and repair. Not only the extent of experimentally induced liver fibrosis was more severe in Dcn-/- animals, but also the healing process was significantly delayed vis-à-vis wild-type mice. Collagen I, III, and IV mRNA levels in Dcn-/- livers were higher than those of wild-type livers only in the first 2 months, but no difference was observed after 4 months of fibrosis induction, suggesting that the elevation of these proteins reflects a specific impairment of their degradation. Gelatinase assays confirmed this hypothesis as we found decreased MMP-2 and MMP-9 activity and higher expression of TIMP-1 and PAI-1 mRNA in Dcn-/- livers. In contrast, at the end of the recovery phase increased production rather than impaired degradation was found to be responsible for the excessive connective tissue deposition in livers of Dcn-/- mice. Higher expression of TGFβ1-inducible early responsive gene in decorin-null livers indicated enhanced bioactivity of TGFβ1 known to upregulate TIMP-1 and PAI-1 as well. Moreover, two main axes of TGFβ1-evoked signaling pathways were affected by decorin deficiency, namely the Erk1/2 and Smad3 were activated in Dcn-/- samples, whereas no significant difference in phospho-Smad2 was observed between mice with different genotypes. Collectively, our results indicate that the lack of decorin favors the development of hepatic fibrosis and attenuates its subsequent healing process at least in part by affecting the bioactivity of TGFβ1.

Dataset Information

Ablation of Foxl1-Cre-labeled hepatic progenitor cells and their descendants impairs recovery of mice from liver injury.

Publications

Ablation of Foxl1-Cre-labeled hepatic progenitor cells and their descendants impairs recovery of mice from liver injury.

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