title: Cell cycle progression proteins (cyclins), oncogene expression, and signal transduction during the proliferative response of human hepatocytes to hepatocyte growth factor.
abstract: Human hepatocytes stimulated with human recombinant hepatocyte growth factor (h-rHGF) (10 ng/mL) displayed a characteristic lag period before entering into the S phase. The duration of this delay was dependent on the timing of h-rHGF addition to cultures. The highest peak of DNA synthesis was observed at 120 hours of culture when hepatocytes were stimulated with h-rHGF at 72 hours of culture. This was accompanied by an early peak of c-jun and c-fos synthesis (3 hours after addition of h-rHGF) followed by c-myc (6 hours) and increased expression of cyclins A, B, D, and E (12 hours after h-rHGF). A significant dose-dependent increase in inositol 1,4,5-P3 was observed within 45 seconds after stimulation with the factor. This was followed by an immediate increase in the cytosolic-free calcium. Cyclic adenosine monophosphate (cAMP) levels did not change after stimulation with the factor. Tyrosine phosphorylation seems to be an early event in the course of the stimulatory effect of h-rHGF on DNA synthesis of hepatocytes; genistein, a tyrosine kinase inhibitor, impaired the stimulatory effect of h-rHGF on DNA synthesis dose dependently. On the other hand, the action of the factor was negatively regulated by protein kinase C activation, as shown by the increased stimulatory effect of h-rHGF on DNA synthesis upon inhibition of protein kinase C by H7.
authors.affiliation: Unidad de Hepatología Experimental, Centro de Investigación, Hospital La Fe, Valencia, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Gómez-Lechón
authors.forename: I
authors.initials: I
authors.lastname: Guillén
authors.forename: X
authors.initials: X
authors.lastname: Ponsoda
authors.forename: R
authors.initials: R
authors.lastname: Fabra
authors.forename: R
authors.initials: R
authors.lastname: Trullenque
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: J V
authors.initials: JV
authors.lastname: Castell
mesh_terms: D000368:Aged; D002118:Calcium / Q000378:metabolism; D002453:Cell Cycle; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism; D016213:Cyclins / Q000378:metabolism*; D004247:DNA / Q000096:biosynthesis; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005260:Female; D015870:Gene Expression; D019833:Genistein; D017228:Hepatocyte Growth Factor / Q000494:pharmacology*; D006801:Humans; D015544:Inositol 1,4,5-Trisphosphate / Q000378:metabolism; D007529:Isoflavones / Q000494:pharmacology; D008099:Liver / Q000166:cytology* / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D010766:Phosphorylation; D011493:Protein Kinase C / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D016760:Proto-Oncogene Proteins c-fos / Q000378:metabolism; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism; D011519:Proto-Oncogenes / Q000235:genetics*; D015398:Signal Transduction; D014443:Tyrosine / Q000378:metabolism
chemical_list: D016213:Cyclins; D004791:Enzyme Inhibitors; D007529:Isoflavones; D016760:Proto-Oncogene Proteins c-fos; D016755:Proto-Oncogene Proteins c-jun; D016271:Proto-Oncogene Proteins c-myc; D014443:Tyrosine; D017228:Hepatocyte Growth Factor; D015544:Inositol 1,4,5-Trisphosphate; D004247:DNA; D019833:Genistein; D000242:Cyclic AMP; D011505:Protein-Tyrosine Kinases; D011493:Protein Kinase C; D002118:Calcium