Abstract:
:Poly(ADP-ribosyl)ation is a post-translational modification of protein occurring in the nucleus by poly(ADP-ribose) polymerase enzyme activity. The main role of poly(ADP-ribose) polymerase system as "nick sensor" and DNA breaks repair is based on its activation via DNA strand breaks. Furthermore, poly(ADP-ribose) polymerase modifies the binding to DNA of several transcriptional factors by poly(ADP-ribosyl)ation, thereby regulating also transcriptional gene expression. We have analyzed whether poly(ADP-ribose) polymerase activity is involved in basic fibroblast growth factor (FGF2)-mediated upregulation of urokinase-type plasminogen activator (uPA) mRNA. We demonstrated that specific inhibition of poly(ADP-ribose) polymerase activity via 3-aminobenzamide (3ABA) or NAD+ deprivation prevents FGF2-mediated uPA mRNA over-expression and cell-associated plasminogen activator (PA) production in GM7373 endothelial cell line. We verified that FGF2 stimulates poly(ADP-ribose) polymerase activity by a DNA strand breaks-independent manner which involves a mitogen-activated protein kinases (MAPK)-dependent pathway, as confirmed by using PD98059 inhibitor and anisomycin stimulation. Poly(ADP-ribose) polymerase involved in this mechanism is mainly the 60 kDa molecular mass isoform, that presents an increase in serine phosphorylation in the presence of FGF2.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Caldini R,Barletta E,Del Rosso M,Giovannelli L,Chevanne Mdoi
10.1002/jcp.20096keywords:
subject
Has Abstractpub_date
2005-01-01 00:00:00pages
125-34issue
1eissn
0021-9541issn
1097-4652journal_volume
202pub_type
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