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The interleukin-6 receptor as a target for prevention of coronary heart disease: a mendelian randomisation analysis
Journal article   Open access   Peer reviewed

The interleukin-6 receptor as a target for prevention of coronary heart disease: a mendelian randomisation analysis

Daniel I Swerdlow, Interleukin-6 Receptor Mendelian Randomisation Analysis (IL6R MR) Consortium, Michael V Holmes, Karoline B Kuchenbaecker, Jorgen E L Engmann, Tina Shah, Reecha Sofat, Yiran Guo, Christina Chung, Anne Peasey, …
The Lancet (British edition), Vol.379(9822), pp.1214-1224
03/31/2012
DOI: 10.1016/S0140-6736(12)60110-X
PMCID: PMC3316968
PMID: 22421340
url
https://doi.org/10.1016/S0140-6736(12)60110-XView
Published (Version of record) Open Access

Abstract

A high circulating concentration of interleukin 6 is associated with increased risk of coronary heart disease. Blockade of the interleukin-6 receptor (IL6R) with a monoclonal antibody (tocilizumab) licensed for treatment of rheumatoid arthritis reduces systemic and articular inflammation. However, whether IL6R blockade also reduces risk of coronary heart disease is unknown. Applying the mendelian randomisation principle, we used single nucleotide polymorphisms (SNPs) in the gene IL6R to evaluate the likely efficacy and safety of IL6R inhibition for primary prevention of coronary heart disease. We compared genetic findings with the effects of tocilizumab reported in randomised trials in patients with rheumatoid arthritis. In 40 studies including up to 133,449 individuals, an IL6R SNP (rs7529229) marking a non-synonymous IL6R variant (rs8192284; p.Asp358Ala) was associated with increased circulating log interleukin-6 concentration (increase per allele 9·45%, 95% CI 8·34-10·57) as well as reduced C-reactive protein (decrease per allele 8·35%, 95% CI 7·31-9·38) and fibrinogen concentrations (decrease per allele 0·85%, 95% CI 0·60-1·10). This pattern of effects was consistent with IL6R blockade from infusions of tocilizumab (4-8 mg/kg every 4 weeks) in patients with rheumatoid arthritis studied in randomised trials. In 25,458 coronary heart disease cases and 100,740 controls, the IL6R rs7529229 SNP was associated with a decreased odds of coronary heart disease events (per allele odds ratio 0·95, 95% CI 0·93-0·97, p=1·53×10(-5)). On the basis of genetic evidence in human beings, IL6R signalling seems to have a causal role in development of coronary heart disease. IL6R blockade could provide a novel therapeutic approach to prevention of coronary heart disease that warrants testing in suitably powered randomised trials. Genetic studies in populations could be used more widely to help to validate and prioritise novel drug targets or to repurpose existing agents and targets for new therapeutic uses. UK Medical Research Council; British Heart Foundation; Rosetrees Trust; US National Heart, Lung, and Blood Institute; Du Pont Pharma; Chest, Heart and Stroke Scotland; Wellcome Trust; Coronary Thrombosis Trust; Northwick Park Institute for Medical Research; UCLH/UCL Comprehensive Medical Research Centre; US National Institute on Aging; Academy of Finland; Netherlands Organisation for Health Research and Development; SANCO; Dutch Ministry of Public Health, Welfare and Sports; World Cancer Research Fund; Agentschap NL; European Commission; Swedish Heart-Lung Foundation; Swedish Research Council; Strategic Cardiovascular Programme of the Karolinska Institutet; Stockholm County Council; US National Institute of Neurological Disorders and Stroke; MedStar Health Research Institute; GlaxoSmithKline; Dutch Kidney Foundation; US National Institutes of Health; Netherlands Interuniversity Cardiology Institute of the Netherlands; Diabetes UK; European Union Seventh Framework Programme; National Institute for Healthy Ageing; Cancer Research UK; MacArthur Foundation.
Phenotype Antibodies, Monoclonal, Humanized - adverse effects Gene Frequency - genetics Antibodies, Monoclonal, Humanized - therapeutic use Genetic Association Studies Receptors, Interleukin-6 - genetics Humans Inflammation Mediators - blood Genotype Treatment Outcome Receptors, Interleukin-6 - antagonists & inhibitors Signal Transduction - genetics Randomized Controlled Trials as Topic Coronary Disease - prevention & control Coronary Disease - genetics Signal Transduction - drug effects Mendelian Randomization Analysis Polymorphism, Single Nucleotide - genetics Genetic Variation - genetics

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