Abstract:
:12-O-tetradecanoyl phorbol 13-acetate (TPA) and 1,2-dioctanoyl-sn-glycerol (diC8) activate protein kinase C (PKC) in transformed fetal bovine aortic endothelial GM 7373 cells. Both molecules cause a similar increase in membrane-associated PKC activity and in the phosphorylation of a PKC-specific endogenous 87-kDa substrate in intact cells. Even though both TPA and diC8 exert a mitogenic activity in GM 7373 cells, only TPA induces also an increase in cell-associated plasminogen activator (PA) activity. Down-regulation of PKC which follows TPA-pretreatment completely abolishes the mitogenic activity of diC8 and the mitogenic and PA-inducing activity of TPA. However, both the PKC inhibitor H-7 and the down-regulation of PKC which follows a prolonged stimulation with diC8 do not abolish the PA-inducing activity of TPA. The PA-inducing activity of TPA is instead inhibited in cultures incubated in the presence of 1 mM EGTA or in a calcium-free medium. The data indicate that TPA and diC8 induce a different pattern of cellular activation in GM 7373 cells and that the PA-inducing activity of TPA might not be mediated by PKC.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Maier JA,Presta M,Ragnotti Gdoi
10.1016/0006-291x(89)92487-xsubject
Has Abstractpub_date
1989-04-28 00:00:00pages
682-91issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(89)92487-Xjournal_volume
160pub_type
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