The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/2000/1/303/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 2, January 17, 2000 303-312


Original Article

Arterial Inflammation in Mice Lacking the Interleukin 1 Receptor Antagonist Gene

Martin J.H. Nicklina, David E. Hughesb, Jenny L. Bartona, Jan M. Urec, and Gordon W. Duffa
a Division of Molecular and Genetic Medicine, University of Sheffield, Royal Hallamshire Hospital, Sheffield S10 2JF, United Kingdom
b Division of Oncology and Cellular Pathology, University of Sheffield, Royal Hallamshire Hospital, Sheffield S10 2JF, United Kingdom
c Gene Targeting Laboratory, Centre for Genome Research, University of Edinburgh, Edinburgh EH9 3JQ, United Kingdom

Correspondence to: Martin J.H. Nicklin, Div. of Molecular and Genetic Medicine, University of Sheffield, Sheffield S10 2JF, UK. Tel:44-114-271-3261 Fax:44-114-272-1104 E-mail:m.nicklin{at}sheffield.ac.uk.

Branch points and flexures in the high pressure arterial system have long been recognized as sites of unusually high turbulence and consequent stress in humans are foci for atherosclerotic lesions. We show that mice that are homozygous for a null mutation in the gene encoding an endogenous antiinflammatory cytokine, interleukin 1 receptor antagonist (IL-1ra), develop lethal arterial inflammation involving branch points and flexures of the aorta and its primary and secondary branches. We observe massive transmural infiltration of neutrophils, macrophages, and CD4+ T cells. Animals appear to die from vessel wall collapse, stenosis, and organ infarction or from hemorrhage from ruptured aneurysms. Heterozygotes do not die from arteritis within a year of birth but do develop small lesions, which suggests that a reduced level of IL-1ra is insufficient to fully control inflammation in arteries. Our results demonstrate a surprisingly specific role for IL-1ra in the control of spontaneous inflammation in constitutively stressed artery walls, suggesting that expression of IL-1 is likely to have a significant role in signaling artery wall damage.

Key Words: interleukin 1, vasculitis, aorta, arteritis, chronic disease


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