Inhibitory Regulation of Serum Factor(s)-Caused Ornithine Decarboxylase Induction by the Protein Kinase C System in A431 Human Epidermoid Carcinoma Cells
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概要
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Replacement of the culture medium with fresh medium containing 10% fetal calf serum caused ornithine decarboxylase (ODC) induction in A431 human epidermoid carcinoma cells. Two peaks of ODC activity were observed at 5 and 14 hr after the medium replacement. The peak activity observed at 5 hr was more prominent than that at 14 hr. The first peak of ODC induction was suppressed by a potent protein kinase C activator, 12-O-tetradecanoylphorbol-13-acetate (TPA), in a concentration-dependent manner. The second peak, however, was not suppressed by TPA. Other potent protein kinase C activators, such as mezerein and 12-O-retinoylphorbol-13-acetate, also suppressed the first peak of ODC induction. Synthetic diacylglycerols, 1, 2-dioctanoyl-sn-glycerol and 1-oleoyl-2-acetylglycerol, did not inhibit the serum factor(s)-caused ODC induction. Phorbol-13-acetate, an inactive phorbol ester, also failed to inhibit the ODC induction. The growth of A431 cells was slightly suppressed by TPA. In protein kinase C down-regulated cells, TPA failed to inhibit the serum factor(s)-caused ODC induction. These results suggest that the serum factor(s)-caused ODC induction in A431 cells is negatively regulated by the protein kinase C system, which may not be activated by exogenous diacylglycerols.
著者
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Kato Ryuichi
Department Of Biology Graduate School Of Science Osaka University
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Kamegaya Yoshitaka
Department Of Internal Medicine Keio University
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Jiang Hong
Department Of Cardiology Renmin Hospital Of Wuhan University
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Yamamoto Satoshi
Department Of Biochemistry Nagoya University School Of Medicine
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Jiang Hong
Department of Pharmacology, School of Medicine, Keio University
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Nakadate Teruo
Basic Research Laboratories, Toray Industries, Inc.
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Ishihara Motoko
Department of Pharmacology, School of Medicine, Keio University
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Aizu Eriko
Department of Pharmacology, School of Medicine, Keio University
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