Activation of Interferon-γ Inducing Factor Mediated by Interleukin-1β Converting Enzyme

Author:

Gu Yong1,Kuida Keisuke2,Tsutsui Hiroko3,Ku George1,Hsiao Kathy1,Fleming Mark A.1,Hayashi Nobuki3,Higashino Kazuya3,Okamura Haruki3,Nakanishi Kenji3,Kurimoto Masashi4,Tanimoto Tadao4,Flavell Richard A.5,Sato Vicki1,Harding Matthew W.1,Livingston David J.1,Su Michael S.-S.1

Affiliation:

1. Y. Gu, G. Ku, K. Hsiao, M. A. Fleming, V. Sato, M. W. Harding, D. J. Livingston, M. S.-S. Su, Vertex Pharmaceuticals Inc., 130 Waverly Street, Cambridge, MA 02139, USA.

2. K. Kuida, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan.

3. H. Tsutsui, N. Hayashi, K. Higashino, H. Okamura, K. Nakanishi, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya, Japan.

4. M. Kurimoto and T. Tanimoto, Fujisaki Institute, Hayashibara Biochemical Laboratories, Hayashibara Company Inc., Okayama, Japan.

5. R. A. Flavell, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510, USA.

Abstract

The interleukin-1β (IL-1β) converting enzyme (ICE) processes the inactive IL-1β precursor to the proinflammatory cytokine. ICE was also shown to cleave the precursor of interferon-γ inducing factor (IGIF) at the authentic processing site with high efficiency, thereby activating IGIF and facilitating its export. Lipopolysaccharide-activated ICE-deficient (ICE −/− ) Kupffer cells synthesized the IGIF precursor but failed to process it into the active form. Interferon-γ and IGIF were diminished in the sera of ICE −/− mice exposed to Propionibacterium acnes and lipopolysaccharide. The lack of multiple proinflammatory cytokines in ICE −/− mice may account for their protection from septic shock.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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