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Inhibition by heparin of protein kinase C activation and hydroxyl radical generation in puromycin aminonucleoside treated isolated rat hepatocytes

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Abstract

Heparin has been reported to have many actions similar to calcium-dependent protein kinase (PKC) inhibitors. We have found that puromycin aminonucleoside (PAN) increases hydroxyl radical generation and this was prevented by H-7, a PKC inhibitor in isolated rat hepatocytes. In this study, we investigate the effect of heparin on the increased hydroxyl radical generation as well as PKC activation by PAN in isolated rat hepatocytes. To estimate the amount of hydroxyl radical generation, we measured methylguanidine (MG) and creatol which are the products from the reaction of creatinine and hydroxyl radical. Synthetic rate of MG plus creatol in isolated rat hepatocytes incubated in Krebs-Henseleit bicarbonate buffer containing creatinine and tested reagents were recorded. This rate with or without PAN was 231 ± 11 or 112 ± 5.6 nmol/g wet cells/4 h (mean ± S.E., n = 5), respectively. Heparin concentrations of 3.3, 6.6 and 10 U/ml inhibited MG plus creatol synthesis in the presence of PAN by 30, 38 and 39%, and without PAN by 8.4, 27 and 34%, respectively. Statistical significance was observed except for 3.3 U/ml without PAN. The ratio of PKC in membrane/cytoplasmic fraction, an indicator of PKC activation, increased 2.8- and 3-fold that of the 0 time after 60 and 120 min incubation with PAN while heparin at 10 U/ml almost completely suppressed this increase in the ratio of PKC. The PKC ratio of the membrane/cytoplasmic fraction obtained from hepatocytes with heparin alone or without PAN and heparin was almost unchanged during the tested period. Variation of PKC levels in membrane fraction is similar to that of PKC ratio of the membrane/cytoplasmic fraction. Increased creatol synthesis by PAN and its inhibition by heparin were observed in the same samples as those used for the PKC study.

These results indicate that heparin inhibits the increase in hydroxyl radical generation induced by PAN through inhibition of PKC activation in isolated rat hepatocytes.

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Authors and Affiliations

  1. Department of Internal Medicine, College Clinic, Tsukuba College of Technology, Tsukuba, Ibaraki, 305-0821, Japan

    Kazumasa Aoyagi

  2. Bio-System Research, University of Tsukuba, Tsukuba, Japan

    Yutaka Kuzure

  3. Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Japan

    Siranoush Shahrzad, Aki Hirayama, Sohji Nagase & Atsushi Ueda

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  1. Kazumasa Aoyagi
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Aoyagi, K., Kuzure, Y., Shahrzad, S. et al. Inhibition by heparin of protein kinase C activation and hydroxyl radical generation in puromycin aminonucleoside treated isolated rat hepatocytes. Mol Cell Biochem 244, 3–9 (2003). https://doi.org/10.1023/A:1022427000249

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