Abstract:
:The effect of transforming growth factor-beta (TGF-beta) on the endogenous protein phosphorylation caused by phorbol 12-myristate 13-acetate (PMA), a potent activator of protein kinase C (PKC), was examined in primary cultured mouse epidermal cells. PMA markedly stimulates phosphorylation of endogenous proteins, i.e. KP-1 and KP-2, through Ca(2+)-dependent conventional PKC (cPKC), and KP-10 through Ca(2+)-independent novel PKC (nPKC) in intact epidermal cells. TGF-beta strongly suppressed the PMA-stimulated phosphorylation of these three proteins. Rate of dephosphorylation of these phosphorylated proteins was not affected by TGF-beta. Treatment of epidermal cells with TGF-beta decreased cPKC activity both in cytosolic and particulate fractions, but not nPKC activity. These results indicate that TGF-beta suppresses cPKC- and nPKC-mediated endogenous protein phosphorylation in intact epidermal cells, but the mechanisms of suppression are different.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Nishikawa K,Yamamoto S,Nagumo H,Otsuka C,Kato Rdoi
10.1006/bbrc.1993.1635subject
Has Abstractpub_date
1993-05-28 00:00:00pages
384-9issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(83)71635-9journal_volume
193pub_type
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