| Title | Neutralization of IL-18 attenuates lipopolysaccharide-induced myocardial dysfunction. | | Author(s) | Raeburn CD, Dinarello CA, Zimmerman MA, Calkins CM, Pomerantz BJ, McIntyre RC, Harken AH, Meng X | | Institution | Department of Surgery, University of Colorado Health Sciences Center, 4200 E. Ninth Avenue, Box C-320, Denver, CO 80262, USA. christopher.raeburn@uchsc.edu | | Source | Am J Physiol Heart Circ Physiol 2002 Aug; 283(2):H650-7. | | MeSH | Animals
Antibodies
Heart
Intercellular Adhesion Molecule-1
Interleukin-1
Interleukin-18
Lipopolysaccharides
Male
Mice
Mice, Inbred C57BL
Myocardium
Neutrophils
Research Support, U.S. Gov't, P.H.S.
Tumor Necrosis Factor-alpha
Vascular Cell Adhesion Molecule-1
| | Abstract | Tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta) have been implicated in cardiac dysfunction during endotoxemia. Because IL-18 is a proinflammatory cytokine known to mediate the production of TNF-alpha and IL-1beta and to induce the expression of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), we hypothesized that neutralization of IL-18 would attenuate lipopolysaccharide (LPS)-induced cardiac dysfunction. Mice (C57BL/6) were injected with LPS (0.5 mg/kg ip) or vehicle (normal saline), and left ventricular developed pressure (LVDP) was determined by the Langendorff technique. LVDP was depressed by 38% at 6 h after LPS. LPS-induced myocardial dysfunction was associated with increased myocardial levels of TNF-alpha and IL-1beta as well as increased expression of ICAM-1/VCAM-1. Pretreatment with neutralizing anti-mouse IL-18 antibody attenuated LPS-induced myocardial dysfunction (by 92%) and was associated with reduced myocardial IL-1beta production (65% reduction) and ICAM-1/VCAM-1 expression (50% and 35% reduction, respectively). However, myocardial TNF-alpha levels were not influenced by neutralization of IL-18. In conclusion, neutralization of IL-18 protects against LPS-induced myocardial dysfunction. IL-18 may mediate endotoxemic myocardial dysfunction through induction of and/or synergy with IL-1beta, ICAM-1, and VCAM-1. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 12124212 |
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