NLRC4 inflammasome is an important regulator of interleukin-18 levels in patients with acute coronary syndromes
Background—Interleukin 18 (IL-18) promotes atherosclerotic plaque formation and is increased in patients with acute coronary syndromes. However the relative contribution of genetic variants to the IL-18 levels has not been fully determined. Methods and Results—Baseline plasma IL-18 levels were measu...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
June 2015
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| In: |
Circulation. Cardiovascular genetics
Year: 2015, Jahrgang: 8, Heft: 3, Pages: 498-506 |
| ISSN: | 1942-3268 |
| DOI: | 10.1161/CIRCGENETICS.114.000724 |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1161/CIRCGENETICS.114.000724 Verlag, Volltext: http://circgenetics.ahajournals.org/content/8/3/498 
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| Verfasserangaben: | Åsa Johansson, Niclas Eriksson, Richard C. Becker, Robert F. Storey, Anders Himmelmann, Emil Hagström, Christoph Varenhorst, Tomas Axelsson, Bryan J. Barratt, Stefan K. James, Hugo A. Katus, Philippe Gabriel Steg, Ann-Christine Syvänen, Lars Wallentin, Agneta Siegbahn |
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| 520 | |a Background—Interleukin 18 (IL-18) promotes atherosclerotic plaque formation and is increased in patients with acute coronary syndromes. However the relative contribution of genetic variants to the IL-18 levels has not been fully determined. Methods and Results—Baseline plasma IL-18 levels were measured in 16 633 patients with acute coronary syndrome, of whom 9340 had genetic data that passed genotype quality control. A 2-stage genome-wide association study was performed, followed by combined analyses using >10 million genotyped or imputed genetic markers. Single nucleotide polymorphisms at 3 loci (IL18, NLRC4, and MROH6) were identified (P<3.15×10−8) in the discovery cohort (n=3777) and replicated in the remaining patients (n=5563). In the pooled data (discovery+replication cohort), 7 independent associations, in 5 chromosomal regions, were associated with IL-18 levels (minimum P=6.99×10-72). Six single nucleotide polymorphisms are located in predicted promoter regions of which one disrupts a transcription factor binding site. One single nucleotide polymorphism in NLRC4 is a rare missense variant, predicted to be deleterious to the protein. Altogether, the identified genetic variants explained 8% of the total variation in IL-18 levels in the cohort. Conclusions—Our results show that genetic variants play an important role in determining IL-18 levels in patients with acute coronary syndrome and we have identified genetic variants located in the IL-18 gene (IL18) or close to genes that are involved in procaspase-1 activation (NLRC4 and CARD16, CARD17, and CARD18). These associations also highlight the importance of the NLRC4 inflammasome for IL-18 production in acute coronary syndrome patients. | ||
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