Abstract:
:In quiescent cultures of rabbit aortic smooth muscle cells, whole blood serum-induced DNA synthesis was inhibited markedly by protein kinase C-activating 12-O-tetradecanoyl-phorbol-13-acetate (TPA) and phorbol-12, 13-dibutyrate (PDBu), cyclic AMP-derivatives, such as dibutyryl cyclic AMP (Bt2cAMP) and 8-bromo-cyclic AMP, and interferon alpha/beta. Neither TPA nor interferon alpha/beta elevated the cellular cyclic AMP level. Neither Bt2cAMP nor interferon alpha/beta induced the phospholipase C-mediated hydrolysis of phosphoinositides. The down-regulation of protein kinase C by prolonged treatment with PDBu abolished the antiproliferative action of TPA but did not affect that of Bt2cAMP or interferon alpha/beta. TPA and Bt2cAMP inhibited the serum-induced DNA synthesis when added within 12 h after the addition of the serum, while interferon alpha/beta was active only when added within 6 h. These results suggest that there are at least three independent signaling systems, protein kinase C- and cyclic AMP-mediated systems and an unidentified system for interferon alpha/beta, which are involved in the antiproliferative mechanisms in rabbit aortic smooth muscle cells.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Fukumoto Y,Kawahara Y,Kariya K,Araki S,Fukuzaki H,Takai Ydoi
10.1016/s0006-291x(88)80052-4subject
Has Abstractpub_date
1988-11-30 00:00:00pages
337-45issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(88)80052-4journal_volume
157pub_type
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