Cited by 133Inflammasome and immune disordersProtease and Inhibitor MechanismsCell death mechanisms and regulation

The Serpin Proteinase Inhibitor 9 Is an Endogenous Inhibitor of Interleukin 1β–Converting Enzyme (Caspase-1) Activity in Human Vascular Smooth Muscle Cells

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Young, James L., Sukhova, Galina K., Foster, Don, Kisiel, Walter, Libby, Peter, Schönbeck, Uwe·2000·The Journal of Experimental Medicine

Abstract

Interleukin-1beta-converting enzyme (ICE, caspase-1) regulates key steps in inflammation and immunity, by activating the proinflammatory cytokines interleukin (IL-)1beta and IL-18, or mediating apoptotic processes. We recently provided evidence for the regulation of caspase-1 activity via an endogenous inhibitor expressed by human vascular smooth muscle cells (SMCs) (Schönbeck, U., M. Herzberg, A. Petersen, C. Wohlenberg, J. Gerdes, H.-D. Flad, and H. Loppnow. 1997. J. Exp. Med. 185:1287-1294). However, the molecular identity of this endogenous inhibitor remained undefined. We report here that the serine proteinase inhibitor (serpin) PI-9 accounts for the endogenous caspase-1 inhibitory activity in human SMCs and prevents processing of the enzyme's natural substrates, IL-1beta and IL-18 precursor. Treatment of SMC lysates with anti-PI-9 antibody abrogated the caspase-1 inhibitory activity and coprecipitated the enzyme, demonstrating protein-protein interaction. Furthermore, PI-9 antisense oligonucleotides coordinately reduced PI-9 expression and promoted IL-1beta release. Since SMCs comprise the majority of cells in the vascular wall, and because IL-1 is implicated in atherogenesis, we tested the biological validity of our in vitro findings within human atheroma in situ. The unaffected arterial wall contains abundant and homogeneously distributed PI-9. In human atherosclerotic lesions, however, PI-9 expression correlated inversely with immunoreactive IL-1beta, supporting a potential role of the endogenous caspase-1 inhibitor in this chronic inflammatory disease. Thus, our results provide new insights into the regulation of this enzyme involved in immune and inflammatory processes of chronic inflammatory diseases, and point to an endogenous antiinflammatory action of PI-9, dysregulated in a prevalent human disease.

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  1. Howard A.D. Kostura M.J. Thornberry N. Ding G.J. Limjuco G. Weidner J. Salley J.P. Hogquist K.A. Chaplin D.D. Mumford R.A. IL-1-converting enzyme requires aspartic acid residues for processing of the IL-1 beta precursor at two distinct sites and does not cleave 31-kDa IL-1 alpha J. Immunol. 147 1991 2964 2969 1919001

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Authors
Young, J. L., Sukhova, G. K., Foster, D., Kisiel, W., Libby, P., & Schönbeck, U.
Affiliations
  • Brigham and Women's Hospital (US)
  • bZymoGenetics, Incorporated, Seattle, Washington 93102
  • University of New Mexico (US)
Venue
The Journal of Experimental Medicine
Published
2000-05-01
Volume
191
Issue
9
Pages
1535-1544
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2171074690
Cited by
133
References
58
Citations by year
2026: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 4 · 2020: 6 · 2019: 6 · 2018: 1 · 2017: 5 · 2016: 2 · 2015: 3 · 2014: 1 · 2013: 10 · 2012: 7
FWCI
3.62
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Experimental Medicine (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01hl034636-23)
  • National Heart, Lung, and Blood Institute (R37HL034636, R01-HL034636, HL-34636)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
caspase-1, IL-1β, IL-18, vascular smooth muscle cells, protein-protein interaction, atherosclerosis, inflammation, anti-inflammatory regulation, atherosclerotic plaque
MeSH terms
Arteries, Arteriosclerosis, Gene Expression Regulation, Humans, Interleukin-1, Interleukins, Muscle, Smooth, Vascular, Protein Precursors, Protein Processing, Post-Translational, Serpins, Interleukin-18, Caspase Inhibitors

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