Characterization of the effects of human placental HGF on rat hepatocytes - PubMed (original) (raw)
Characterization of the effects of human placental HGF on rat hepatocytes
J Hernandez et al. J Cell Physiol. 1992 Jan.
Abstract
Hepatocyte growth factor (HGF) also known as hepatopoietin A (HPTA) (Michalopoulos, FASEB J., 4:176-187, 1990) is a heparin-binding growth factor whose characterization and tissue distribution have been reported elsewhere. This growth factor was recently cloned and its amino acid sequence determined under the name of hepatocyte growth factor (HGF) (Miyazawa et al., Biochem. Biophys. Res. Commun., 163:967-973, 1989; Zarnegar et al., Biochem. Biophys. Res. Commun., 163:1370-1376, 1989; Nakamura et al., Nature, 342:440-443, 1989). Human placenta is one of the tissues that contains significant amounts of HGF. We isolated HGF from human placenta and characterized its biologic effect on rat hepatocytes. Human placenta HGF was isolated in high purity as a single chain molecule. Single chain HGF stimulated DNA synthesis in primary rat hepatocyte cultures in serum-free medium. The maximal effect was seen at 5-10 ng/ml. The maximal response occurred at 25-48 hours after plating of the hepatocytes. Protein synthesis was also stimulated by HGF in primary rat hepatocyte cultures. There were peak responses at 19-24 and 37-42 hours after plating of the hepatocytes. TGF beta 1 inhibited more than 95% of HGF-induced DNA synthesis but only 25% of HGF-induced protein synthesis. HGF interacted in an additive manner with EGF, a well-known hepatocyte mitogen. There was not an additive interaction between HGF and aFGF. Regenerating liver hepatocytes obtained from rats which underwent two-thirds partial hepatectomies (PHX) also responded to HGF in a dose-dependent manner as the hepatocytes from normal liver.
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