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Effect of natural interferon α on proliferation and apoptosis of hepatic stellate cells

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Abstract

Inhibition of the proliferation of hepatic stellate cells (HSC) is clinically important for the control of liver fibrosis and cirrhosis. Interferons are now frequently used for chronic viral hepatitis because of their anti-viral activity. However, patients treated with interferons exhibit a regression of liver fibrosis even if viral eradication is not achieved, indicating that interferon itself has anti-fibrotic activity. Herein, we show the anti-proliferation and pro-apoptotic activity of natural interferon α against HSC. We found that interferon α inhibited serum-stimulated [3H]thymidine incorporation of HSC in a dose-dependent manner, with a significant reduction at more than 100 U/ml. Interferon α also attenuated PDGF-BB-stimulated DNA synthesis of HSC. Although the molecular mechanism behind these phenomena has not been defined, we found that interferon α triggers the apoptosis of HSC treated with low-dose tumor necrosis factor α, as determined by the Alamar blue assay, morphology, and DNA ladder formation. Furthermore, interferon α decreased inhibitor of caspase-activated DNase (ICAD) levels, which may augment tumor necrosis factor α-induced cell death signals. Thus, interferon α regulates the number of myofibroblastic hepatic stellate cells and may clinically contribute to the regression of human liver fibrosis.

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Acknowledgments

We thank Drs. Kazuki Nakatani, Naoto Maeda, Yukihiro Imanishi, and Koji Kinoshita for their critical comments on this work. This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS). A part of this study was presented at the 12th International Symposium on Cells of the Hepatic Sinusoid (12th ISCHS).

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Authors and Affiliations

  1. Department of Hepatology, Graduate School of Medicine, Osaka City University, 1-4-3, Asahimachi, Abeno, 545-8585, Osaka, Japan

    Tomohiro Ogawa & Norifumi Kawada

  2. Department of Anatomy, Graduate School of Medicine, Osaka City University, Osaka, Japan

    Kazuo Ikeda

Authors
  1. Tomohiro Ogawa
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  2. Norifumi Kawada
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  3. Kazuo Ikeda
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Correspondence to Norifumi Kawada.

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Ogawa, T., Kawada, N. & Ikeda, K. Effect of natural interferon α on proliferation and apoptosis of hepatic stellate cells. Hepatol Int 3, 497–503 (2009). https://doi.org/10.1007/s12072-009-9129-y

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  • DOI: https://doi.org/10.1007/s12072-009-9129-y

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