4.3 Article

Geographical segregation and IL-6: a marker of chronic inflammation in older adults

Journal

BIOMARKERS IN MEDICINE
Volume 2, Issue 4, Pages 335-348

Publisher

FUTURE MEDICINE LTD
DOI: 10.2217/17520363.2.4.335

Keywords

elderly; environmental impact; health risk; IL-6; inflammatory marker; longitudinal study

Funding

  1. Duke University Claude D Pepper Older Americans Independence Center
  2. NIH [5P30A G028716, 1-P30-ES011961]
  3. NICHD/NCMRR [K01HD049593]
  4. NIA [N01 AG12102, N1A R01 AG12765, NIA R01 AG17559]
  5. Lisa Berkman, PhD [5R01 AG18369-03]

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Aim: To examine environmental sociodemographic risks of high IL-6, a marker of chronic inflammation in older adults. Methods: We spatially linked 1990 USA Census tract demographic and economic measures to a prospective cohort study of representative community residents aged 71 years and older, from over 1700 of whom a cytokine protein and biological marker of chronic inflammation, IL-6, was collected. Using generalized interactive mixed models, we modeled 1989-1990 individual and census level risk factors for the dependent variable high IL-6 between 1992-1993 (high IL-6 = upper quartile: >2.96 pg/ml). Results: After individual health risk adjustment, IL-6 remained elevated in communities with greater densities of poor older adults (odd ratio [OR]: 1.25 per 10% increase in exposure, 95% confidence interval [Cl]: 1.05, 1.48) and in racially segregated communities (OR: 1.14 per 10% increase in exposure, 95% Cl: 1.04, 1.25). Conclusions: Socially disadvantaged environments may influence IL-6, a biomarker of age-associated inflammation.

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