A new interferon, limitin, displays equivalent immunomodulatory and antitumor activities without myelosuppressive properties as compared with interferon-alpha

Experimental Hematology
S KawamotoY Tomiyama

Abstract

Limitin is a new member of type I interferon (IFN) identified with an expression cloning based on the growth suppression of a myelomonocytic leukemia cell line WEHI3. Although limitin uses the IFN-alpha/beta receptor, its signal transduction pathways to express the antiviral effects are different from those of IFN-alpha. To clarify the characteristics of limitin, we compared the biological activities of limitin, such as the antiviral, immunomodulatory, antitumor, and myelosuppressive effects, with IFN-alpha. Limitin and IFN-alpha were titered with a cytopathic effect dye binding assay. Induction of MHC class I on a keratinocyte cell line PAM212 was estimated with flow cytometry. Induction of OVA-restricted cytotoxic T lymphocyte (CTL) activity was analyzed with 51Cr release assay. Antiproliferative effects were evaluated with 3H-thymidine incorporation assay using WEHI3 and a lymphoblast cell line L1210. Myelosuppresive effects were evaluated with colony assay. In vivo side effects were estimated after the injection of limitin or IFN-alpha. Limitin had relatively higher antiviral activity than IFN-alpha. Limitin induced the surface expression of MHC class I, the enhancement of CTL activity, and the growth inhibition of lymphohe...Continue Reading

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Citations

Mar 20, 2009·The Journal of Biological Chemistry·J Frederic MushinskiJane B Trepel
Dec 24, 2004·International Journal of Hematology·Kenji Oritani, Yoshiaki Tomiyama
May 15, 2007·Proceedings of the National Academy of Sciences of the United States of America·Amy D Brideau-AndersenPhillip A Patten
Jun 21, 2005·Journal of Cellular and Molecular Medicine·Kenji Oritani, Yuzuru Kanakura
Oct 9, 2012·The Journal of Immunology : Official Journal of the American Association of Immunologists·Ahmad A TarhiniJohn M Kirkwood
Jul 2, 2019·Molecular Medicine Reports·Lanfei ZhouYisen Shao

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