Fibronectin and Laminin Induce Expression of Islet Cell Markers in Hepatic Oval Cells in Culture.
From: Laboratory for Cellular and Molecular Endocrinology LIM-25, University of São Paulo School of Medicine, Av. Dr. Arnaldo, 455 s/4307, 01246-903, São Paulo, Brazil.
Cell and tissue research
- Publish Date: Mar 2007
- ISSN: 0302-766X
- Volume: 327
- Issue: 3
- Pages: 529-37
- Medium: Print
- Language: English
- Citation (JAMA): Leite Adriana Ribeiro, Corrêa-Giannella Maria Lúcia, Dagli Maria Lúcia Zaidan, et al. Fibronectin and Laminin Induce Expression of Islet Cell Markers in Hepatic Oval Cells in Culture.. Cell Tissue Res. Mar 2007;327:529-37
Abstract
Hepatic oval cells (OC) are considered to be facultative liver stem cells and, because they may undergo differentiation into a variety of cell lineages, they might have the potential to be used in cellular therapy. Signals delivered by extracellular matrix (ECM) proteins take part in cellular differentiation in cooperation with signals from growth factors; indeed, some ECM proteins, such as laminin (LAM) and fibronectin (FN), have been shown to contribute to beta-cell differentiation and islet development, respectively. Since no previous studies have investigated the effect of ECM proteins on the expression of islet cell markers by cultured OC, the purpose of the present study was to evaluate whether FN and LAM modulate the expression of genes related to the endocrine pancreas in these liver cells. OC proliferation was induced in Wistar rats by prolonged treatment with 2-acetoaminofluorene/allyl alcohol and confirmed by reverse transcription/polymerase chain reaction and hepatic immunocytochemical and histopathological analyses. OC isolation was performed by Ficoll gradient and magnetic-activated cell sorting. OC were cultured for 1 and 2 months under several conditions with specific growth factors, over a FN or LAM substrate or in high glucose, nicotinamide and fetal calf serum. OC cultured on FN substrate expressed Pdx-1, Pax-6, insulin 2 and glucagon. LAM also induced the expression of Pdx-1, insulin 1 and insulin 2, glucagon, somatostatin and GLUT-2. Our results suggest that these ECM proteins can be used in protocols of OC transdifferentiation aimed at reducing the period necessary for complete transdifferentiation.
Mesh Headings (Keywords): 2-Acetylaminofluorene, Animals, Biological Markers, Cell Differentiation, Cell Separation, Cells, Cultured, Eye Proteins, Fibronectins, Gene Expression, Glucagon, Homeodomain Proteins, Insulin, Insulin-Secreting Cells, Laminin, Liver, Male, Paired Box Transcription Factors, Pancreatic Hormones, Propanols, Rats, Rats, Wistar, Repressor Proteins, Specific Pathogen-Free Organisms, Stem Cells, Trans-Activators
Check for Full Text / PubMed Unique Identifier (PMID): 17149594
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