Cited by 676Lipoproteins and Cardiovascular HealthAdipokines, Inflammation, and Metabolic DiseasesAtherosclerosis and Cardiovascular Diseases

Long-Term Interleukin-6 Levels and Subsequent Risk of Coronary Heart Disease: Two New Prospective Studies and a Systematic Review

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Danesh, John, Kaptoge, Stephen, Mann, Andrea G, Sarwar, Nadeem, Wood, Angela, Angleman, Sara B, Wensley, Frances, Higgins, Julian P. T +6 more·2008·PLoS Medicine

Abstract

BACKGROUND: The relevance to coronary heart disease (CHD) of cytokines that govern inflammatory cascades, such as interleukin-6 (IL-6), may be underestimated because such mediators are short acting and prone to fluctuations. We evaluated associations of long-term circulating IL-6 levels with CHD risk (defined as nonfatal myocardial infarction [MI] or fatal CHD) in two population-based cohorts, involving serial measurements to enable correction for within-person variability. We updated a systematic review to put the new findings in context. METHODS AND FINDINGS: Measurements were made in samples obtained at baseline from 2,138 patients who had a first-ever nonfatal MI or died of CHD during follow-up, and from 4,267 controls in two cohorts comprising 24,230 participants. Correction for within-person variability was made using data from repeat measurements taken several years apart in several hundred participants. The year-to-year variability of IL-6 values within individuals was relatively high (regression dilution ratios of 0.41, 95% confidence interval [CI] 0.28-0.53, over 4 y, and 0.35, 95% CI 0.23-0.48, over 12 y). Ignoring this variability, we found an odds ratio for CHD, adjusted for several established risk factors, of 1.46 (95% CI 1.29-1.65) per 2 standard deviation (SD) increase of baseline IL-6 values, similar to that for baseline C-reactive protein. After correction for within-person variability, the odds ratio for CHD was 2.14 (95% CI 1.45-3.15) with long-term average ("usual") IL-6, similar to those for some established risk factors. Increasing IL-6 levels were associated with progressively increasing CHD risk. An updated systematic review of electronic databases and other sources identified 15 relevant previous population-based prospective studies of IL-6 and clinical coronary outcomes (i.e., MI or coronary death). Including the two current studies, the 17 available prospective studies gave a combined odds ratio of 1.61 (95% CI 1.42-1.83) per 2 SD increase in baseline IL-6 (corresponding to an odds ratio of 3.34 [95% CI 2.45-4.56] per 2 SD increase in usual [long-term average] IL-6 levels). CONCLUSIONS: Long-term IL-6 levels are associated with CHD risk about as strongly as are some major established risk factors, but causality remains uncertain. These findings highlight the potential relevance of IL-6-mediated pathways to CHD.

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  • IL-6 and CRP are key indicators of disease risk in middle-age and older adulthood as they are prospectively associated with coronary heart disease, diabetes, disability, and all-cause mortality.

    “Biomarkers of systemic inflammation, including interleukin-6 (IL-6) and C-reactive protein (CRP) are key indicators of disease risk in middle-age and older adulthood as they are prospectively associated with coronary heart disease (17,18) as well as diabetes (19), disability (20), and all-cause mortality (21).”

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Authors
Danesh, J., Kaptoge, S., Mann, A. G., Sarwar, N., Wood, A., Angleman, S. B., Wensley, F., Higgins, J. P. T., Lennon, L., Eiriksdottir, G., Rumley, A., Whincup, P. H., Lowe, G. D. O., & Gudnason, V.
Affiliations
  • University of Cambridge (GB)
  • MRC Biostatistics Unit (GB)
  • The Royal Free Hospital (GB)
  • University of Glasgow (GB)
  • St George's, University of London (GB)
  • University of Iceland (IS)
Corresponding author
Danesh, John
Venue
PLoS Medicine
Published
2008-04-08
Volume
5
Issue
4
Pages
e78
ISSN
  • 1549-1277 (ISSN-L)
  • 1549-1676
OpenAlex
W2164189703
Cited by
676
References
53
Citations by year
2026: 11 · 2025: 10 · 2024: 19 · 2023: 16 · 2022: 23 · 2021: 43 · 2020: 36 · 2019: 33 · 2018: 35 · 2017: 40 · 2016: 43 · 2015: 41 · 2014: 52 · 2013: 69 · 2012: 50
FWCI
8.75
Type
journal article
Language
en
Open access
Locations
  • PLoS Medicine (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, other-oa)
  • PubMed (publishedVersion)
  • ENLIGHTEN (Jurnal Bimbingan dan Konseling Islam) (acceptedVersion)
  • St George's Online Research Archive (St George's University of London) (acceptedVersion)
  • LSHTM Research Online (London School of Hygiene and Tropical Medicine) (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • UCL Discovery (University College London) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
Funders
  • GlaxoSmithKline
  • British Heart Foundation
  • National Institutes of Health
  • National Institute on Aging
Topics
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
Keywords
interleukin-6, coronary artery disease, myocardial infarction, coronary death, inflammation, cytokines, within-person variability, regression dilution, C-reactive protein, cardiovascular risk factors, serial biomarker measurement, prospective cohort
MeSH terms
Coronary Disease, Female, Humans, Inflammation, Male, Middle Aged, Prospective Studies, Risk Factors, Cohort Studies, Interleukin-6

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