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Role of heparin-binding epidermal growth factor-like growth factor as a hepatotrophic factor in rat liver regeneration after partial hepatectomy



Role of heparin-binding epidermal growth factor-like growth factor as a hepatotrophic factor in rat liver regeneration after partial hepatectomy



Hepatology 22(5): 1584-1590



Several growth factors including hepatocyte growth factor (HGF) have been implicated in the regulation of liver regeneration. Recently, we reported that heparin-binding epidermal growth factor (EGF)-like growth factor (BB-EGF) has hepatotrophic effects in vitro. We investigated the role of HB-EGF as a hepatotrophic factor in regenerating rat liver after 70% partial hepatectomy. The level of HB-EGF messenger RNA (mRNA) in regenerating rat liver increased 1.5 hours after partial hepatectomy and reached a maximum (about sevenfold over normal) at 6 hours. In contrast, hepatic HGF mRNA levels increased at 12 hours and achieved maximal expression at 24 hours. HB-EGF protein expression increased about 2.8-fold over normal at 10 hours after partial hepatectomy. The number of EGF receptors, to which HB-EGF binds, decreased 6 hours after partial hepatectomy. HB-EGF mRNA levels increased in nonparenchymal cells (NPCs) at 6 hours after partial hepatectomy but not in hepatocytes. Using the reverse transcription-polymerase chain reaction (RT-PCR), HB-EGF gene expression was increased predominantly in Kupffer cells and sinusoidal endothelial cells but not in lipocytes and hepatocytes. These results indicated that HB-EGF may be an important growth factor, produced in an earlier phase rather than HGF, in the regenerating liver after partial hepatectomy by a paracrine mechanism.

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Accession: 009367423

Download citation: RISBibTeXText

PMID: 7590679

DOI: 10.1002/hep.1840220535



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