Abstract:
:To elucidate the mechanism of action of prostaglandin I(2) (PGI(2)) and carbaprostacyclin, we studied their effect on DNA synthesis and proliferation in primary cultures of adult rat hepatocytes. Hepatocyte parenchymal cells, maintained in a serum-free, defined medium, synthesized DNA and proliferated in the presence of PGI(2) or carbaprostacyclin in a time- and dose-dependent manner. PGI(2) was less potent than carbaprostacyclin in stimulating hepatocyte mitogenesis. These effects of PGI(2) and carbaprostacyclin were abolished by treatment with a specific IP-receptor antagonist, CAY10441 (10(-9) - 10(-7) M). Hepatocyte mitogenesis induced by the IP-receptor agonists was almost completely blocked by specific inhibitors of growth-related signal transducers such as AG1478 (5 x 10(-7) M), LY294002 (10(-7) M), PD98059 (10(-6) M), and rapamycin (10 ng/ml). In addition, PGI(2) or carbaprostacyclin significantly increased the kinase activity of a (p175 kDa) receptor tyrosine kinase and the phosphorylation of extracellular signal-regulated kinase (ERK) 2. Addition of a monoclonal antibody against transforming growth factor (TGF)-alpha, but not insulin-like growth factor-I, to the culture dose-dependently inhibited the PGI(2)- or carbaprostacyclin-induced hepatocyte mitogenesis. Furthermore, treatment with the IP-receptor agonists significantly increased the secretion of TGF-alpha to the culture medium. These results indicate that the IP receptor agonist-induced hepatocyte mitogenesis is mediated by autocrine secretion of TGF-alpha followed by activation of a receptor tyrosine kinase / ERK pathway.
journal_name
J Pharmacol Scijournal_title
Journal of pharmacological sciencesauthors
Kimura M,Okamoto H,Natsume H,Ogihara Mdoi
10.1254/jphs.08338fpsubject
Has Abstractpub_date
2009-04-01 00:00:00pages
618-29issue
4eissn
1347-8613issn
1347-8648pii
JST.JSTAGE/jphs/08338FPjournal_volume
109pub_type
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