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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Harken, A. H. Reznikov, L. L. Pomerantz, B. J. Dinarello, C. A. |
| Description | Author Affiliation: Pomerantz BJ ( Department of Surgery, University of Colorado Health Sciences Center, 4200 East Ninth Avenue, Denver, CO 80262, USA.); |
| Abstract | The proinflammatory cytokine IL-18 was investigated for its role in human myocardial function. An ischemia/reperfusion (I/R) model of suprafused human atrial myocardium was used to assess myocardial contractile force. Addition of IL-18 binding protein (IL-18BP), the constitutive inhibitor of IL-18 activity, to the perifusate during and after I/R resulted in improved contractile function after I/R from 35% of control to 76% with IL-18BP. IL-18BP treatment also preserved intracellular tissue creatine kinase levels (by 420%). Steady-state mRNA levels for IL-18 were elevated after I/R, and the concentration of IL-18 in myocardial homogenates was increased (control, 5.8 pg/mg vs. I/R, 26 pg/mg; P < 0.01). Active IL-18 requires cleavage of its precursor form by the IL-1beta-converting enzyme (caspase 1); inhibition of caspase 1 also attenuated the depression in contractile force after I/R (from 35% of control to 75.8% in treated atrial muscle; P < 0.01). Because caspase 1 also cleaves the precursor IL-1beta, IL-1 receptor blockade was accomplished by using the IL-1 receptor antagonist. IL-1 receptor antagonist added to the perifusate also resulted in a reduction of ischemia-induced contractile dysfunction. These studies demonstrate that endogenous IL-18 and IL-1beta play a significant role in I/R-induced human myocardial injury and that inhibition of caspase 1 reduces the processing of endogenous precursors of IL-18 and IL-1beta and thereby prevents ischemia-induced myocardial dysfunction. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Caspase Inhibitors Interleukin-18 Antagonists & Inhibitors Interleukin-1 Myocardial Ischemia Physiopathology Animals CHO Cells Creatine Kinase Metabolism Cricetinae Glycoproteins Intercellular Signaling Peptides And Proteins Interleukin 1 Receptor Antagonist Protein Genetics Microscopy, Confocal Enzymology Myocardium RNA, Messenger Reverse Transcriptase Polymerase Chain Reaction Sialoglycoproteins Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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