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The Journal of Immunology, 1998, 161: 3340-3346.
Copyright © 1998 by The American Association of Immunologists

Generation of Biologically Active IL-1ß by Matrix Metalloproteinases: A Novel Caspase-1-Independent Pathway of IL-1ß Processing1

Uwe Schönbeck, François Mach and Peter Libby2

Vascular Medicine and Atherosclerosis Unit, Cardiovascular Division, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115

Biologic activity of IL-1ß requires processing of the inactive precursor, a function generally ascribed to IL-1ß-converting enzyme (caspase-1). However, alternative mechanisms of IL-1ß activation have been postulated in local inflammatory reactions. Expression of IL-1ß and matrix metalloproteinases (MMPs) frequently occurs simultaneously at sites of inflammation. We describe here that stromelysin-1 (MMP-3), as well as the gelatinases A (MMP-2) and B (MMP-9), processes recombinant human IL-1ß precursor (pIL-1ß) into biologically active forms. Detection of both pIL-1ß processing and biologic IL-1ß activity demonstrated different processing capacities of the respective MMPs. Conversion of pIL-1ß by stromelysin-1 required coincubation for at least 1 h, and biologic activity faded after 8 h to 24 h. Gelatinase A was less effective in processing pIL-1ß, requiring at least 24 h of coincubation. In contrast, gelatinase B processed pIL-1ß within minutes, resulting in immunoreactive products as well as biologic activity stable for 72 h. In addition, prolonged incubation of mature IL-1ß with stromelysin-1, and to a lesser extent also with gelatinases, but not with interstitial collagenase, resulted in the degradation of mature IL-1ß. None of the MMPs processed the second isoform of IL-1, IL-1{alpha}. The present study indicates a biphasic regulation of IL-1ß activity by MMPs: a caspase-1-independent pathway of IL-1ß activation and inhibition of IL-1ß activity by degrading the mature cytokine. The balance of the respective MMPs and pIL-1ß might regulate the long term appearance of IL-1ß activity at sites of acute or chronic inflammation.




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