Suppressive Effect of Protein Kinase C Inhibitors on Tumor Cell Function via Phosphorylation of p53 Protein in Mice

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  • C キナーゼ阻害剤による p53 蛋白リン酸化を介した癌細胞機能抑制
  • Cキナーゼ ソガイザイ ニ ヨル p53 タンパク リン サンカ オ カイシタ ガン サイボウ キノウ ヨクセイ

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Abstract

We examined the role of protein kinase C (PKC) in the phosphorylation of a p53 protein. Exposure to a protein kinase inhibitor, 1-(5-isoquinolinesulfonyl)-2-methylpiperazine dihydrochloride (H7), increased the phosphorylation of the wild type p53 protein, whereas exposure to a tumor promoter phorbol ester, 12-O-tetradecanoyl-phorbol-13-acetate (TPA), decreased it in vivo after incubation with mouse epidermal JB6 cells for 3h. Exposure to a cAMP dependent protein kinase (PKA) activator, forskolin, did not decrease the phosphorylation of p53 protein. In the transient transfection/luciferase reporter transactivation assay, H7 slightly increased the mouse double minute (MDM) 2 reporter transactivation activity of the p53 protein after treatment for 24h, whereas TPA completely blocked it. Exposure to H7 and a specific PKC inhibitor, bisindolylmaleimide (bis), dose-dependently reduced the lung-colonizing potential of highly metastatic B16-F10 mouse melanoma cells in syngeneic mice. These results suggest that the phosphorylation of the wild type p53 protein is inversely related to PKC activation, and also suggest that the phosphorylation of the p53 protein is involved in the function of its transcription factor. The PKC inhibitor may exhibit a potent anti-metastatic effect through the phosphorylation of wild type p53 protein and the activation of its function.

Journal

  • YAKUGAKU ZASSHI

    YAKUGAKU ZASSHI 120 (12), 1387-1394, 2000

    The Pharmaceutical Society of Japan

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