Molecular constituents of the extracellular matrix in rat liver mounting a hepatic progenitor cell response for tissue repair
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  • 作者:Peter Siig Vestentoft (1)
    Peter Jelnes (1)
    Jesper B Andersen (2)
    Thi Anh Thu Tran (1)
    Tenna J?rgensen (1)
    Morten Rasmussen (1) (3)
    Jette Bornholdt (1)
    Lene Mels?ther Gr?vdal (1)
    Charlotte Harken Jensen (4) (5)
    Lotte Katrine Vogel (1)
    Snorri S Thorgeirsson (2)
    Hanne Cathrine Bisgaard (1)
  • 关键词:Ductular reaction ; Extracellular matrix constituents ; First and second tiers of defense ; Hepatic progenitor (oval) cell reaction ; Liver injury and repair ; Three ; dimensional reconstruction
  • 刊名:Fibrogenesis & Tissue Repair
  • 出版年:2013
  • 出版时间:December 2013
  • 年:2013
  • 卷:6
  • 期:1
  • 全文大小:1,967 KB
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  • 作者单位:Peter Siig Vestentoft (1)
    Peter Jelnes (1)
    Jesper B Andersen (2)
    Thi Anh Thu Tran (1)
    Tenna J?rgensen (1)
    Morten Rasmussen (1) (3)
    Jette Bornholdt (1)
    Lene Mels?ther Gr?vdal (1)
    Charlotte Harken Jensen (4) (5)
    Lotte Katrine Vogel (1)
    Snorri S Thorgeirsson (2)
    Hanne Cathrine Bisgaard (1)

    1. Department of Cellular and Molecular Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3, DK, 2200, Copenhagen, Denmark
    2. Laboratory of Experimental Carcinogenesis, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
    3. The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
    4. Laboratory of Molecular and Cellular Cardiology, Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense, Denmark
    5. Department of Cardiovascular and Renal Research, University of Southern Denmark, Odense, Denmark
  • ISSN:1755-1536
文摘
Background Tissue repair in the adult mammalian liver occurs in two distinct processes, referred to as the first and second tiers of defense. We undertook to characterize the changes in molecular constituents of the extracellular matrix when hepatic progenitor cells (HPCs) respond in a second tier of defense to liver injury. Results We used transcriptional profiling on rat livers responding by a first tier (surgical removal of 70% of the liver mass (PHx protocol)) and a second tier (70% hepatectomy combined with exposure to 2-acetylaminofluorene (AAF/PHx protocol)) of defense to liver injury and compared the transcriptional signatures in untreated rat liver (control) with those from livers of day 1, day 5 and day 9 post hepatectomy in both protocols. Numerous transcripts encoding specific subunits of collagens, laminins, integrins, and various other extracellular matrix structural components were differentially up- or down-modulated (P-lt;-.01). The levels of a number of transcripts were significantly up-modulated, mainly in the second tier of defense (Agrn, Bgn, Fbn1, Col4a1, Col8a1, Col9a3, Lama5, Lamb1, Lamb2, Itga4, Igtb2, Itgb4, Itgb6, Nid2), and their signal intensities showed a strong or very strong correlation with Krt1-19, a well-established marker of a ductular/HPC reaction. Furthermore, a significant up-modulation and very strong correlation between the transcriptional profiles of Krt1-19 and St14 encoding matriptase, a component of a novel protease system, was found in the second tier of defense. Real-time PCR confirmed the modulation of St14 transcript levels and strong correlation to Krt-19 and also showed a significant up-modulation and strong correlation to Spint1 encoding HAI-1, a cognate inhibitor of matriptase. Immunodetection and three-dimensional reconstructions showed that laminin, Collagen1a1, agrin and nidogen1 surrounded bile ducts, proliferating cholangiocytes, and HPCs in ductular reactions regardless of the nature of defense. Similarly, matriptase and HAI-1 were expressed in cholangiocytes regardless of the tier of defense, but in the second tier of defense, a subpopulation of HPCs in ductular reactions co-expressed HAI-1 and the fetal hepatocyte marker Dlk1. Conclusion Transcriptional profiling and immunodetection, including three-dimensional reconstruction, generated a detailed overview of the extracellular matrix constituents expressed in a second tier of defense to liver injury.

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