Volume 840, Issue 1 p. 338-351

Regulation of Inhibitory Pathways of the Interleukin-1 System

A. MANTOVANI

A. MANTOVANI

Istituto di Ricerche Farmacologiche “Mario Negrirdquo;, via Eritrea 62,20157 Milano, Italy and (AM) Department of Biomedical Sciences and Biotechnology, University of Brescia, Italy

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M. MUZIO

M. MUZIO

Istituto di Ricerche Farmacologiche “Mario Negrirdquo;, via Eritrea 62,20157 Milano, Italy and (AM) Department of Biomedical Sciences and Biotechnology, University of Brescia, Italy

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P. GHEZZI

P. GHEZZI

Istituto di Ricerche Farmacologiche “Mario Negrirdquo;, via Eritrea 62,20157 Milano, Italy and (AM) Department of Biomedical Sciences and Biotechnology, University of Brescia, Italy

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C. COLOTTA

C. COLOTTA

Department of Immunology and Microbiology, Pharmacia Research Center, Nerviano, Milan, Italy

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M. INTRONA

M. INTRONA

Istituto di Ricerche Farmacologiche “Mario Negrirdquo;, via Eritrea 62,20157 Milano, Italy and (AM) Department of Biomedical Sciences and Biotechnology, University of Brescia, Italy

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First published: 07 February 2006
Citations: 43
Address for correspondence: Istituto di Ricerche Farmacologiche “Mario Negri” via Eritrea 62, 20157 Milano, Italy.

Abstract

Abstract: The IL-1 system includes two agonists, converting enzymes, antagonists, and two receptors (R). New elements and functions in the system will be discussed, including (a) cloning of a new isoform of the receptor antagonist; (b) further analysis of the type II IL-1-binding molecule as a decoy R. The modulation of IL-1R by chemotactic signals was recently investigated. It was found that chemoattractants cause rapid release of the type II decoy R from myelomonocytic cells with a t1/2 of 30 sec. Induction of decoy R release represents an early event in the multistep process of recruitment. It may serve to block the systemic action of IL-1 leaking from sites of inflammation, while preserving responsiveness in situ. We recently cloned the first long pentraxin, PTX3 (human and mouse, cDNA and genomic) as an IL-1-inducible gene. The structural and functional features of this molecule as well as initial evidence of involvement in human pathology will be discussed.