4.5 Article

Systemic inflammation, depression and obstructive pulmonary function: a population-based study

期刊

RESPIRATORY RESEARCH
卷 14, 期 -, 页码 -

出版社

BMC
DOI: 10.1186/1465-9921-14-53

关键词

Depressive symptoms; Pulmonary function; Healthy individuals; Common neurobiological process; Inverse association

资金

  1. Biomedical Research Council, Agency for Science, Technology and Research (ASTAR) [03/1/21/17/214]
  2. Geylang East Home for the Aged, Presbyterian Community Services
  3. Thye Hua Kwan Moral Society (Moral Neighbourhood Links)
  4. Yuhua Neighbourhood Link, Henderson Senior Citizens' Home
  5. NTUC Eldercare Co-op Ltd
  6. Thong Kheng Seniors Activity Centre (Queenstown Centre)
  7. Redhill Moral Seniors Activity Centre

向作者/读者索取更多资源

Background: Levels of Interleukin-6 (IL-6) and C-creative protein (CRP) indicating systemic inflammation are known to be elevated in chronic diseases including chronic obstructive pulmonary disease (COPD) and depression. Comorbid depression is common in patients with COPD, but no studies have investigated whether proinflammatory cytokines mediate the association between pulmonary function and depressive symptoms in healthy individuals with no known history of obstructive pulmonary diseases. Methods: In a population-based sample (n = 2077) of individuals aged 55 and above with no known history of obstructive pulmonary disease in the Singapore Longitudinal Ageing Study (SLAS), we analyzed the relationships between IL-6 and CRP, depressive symptoms (GDS-15 >= 5) and obstructive pulmonary function (FEV1% predicted and FEV1/FVC% predicted). Results: High serum levels of IL-6 and CRP were associated with greater prevalence of depressive symptoms (p < 0.05). High IL-6, high CRP and depressive symptoms were independently associated with decreased FEV1% predicted and FEV1/FVC% predicted after adjusting for smoking status, BMI and number of chronic inflammatory diseases. Increasing grades of combination of inflammatory markers and/or depressive symptoms was associated with progressive increases in pulmonary obstruction. In hierarchical models, the significant association of depressive symptoms with pulmonary obstruction was reduced by the presence of IL-6 and CRP. Conclusions: This study found for the first time an association of depressive symptoms and pulmonary function in older adults which appeared to be partly mediated by proinflammatory cytokines. Further studies should be conducted to investigate proinflammatory immune markers and depressive symptoms as potential phenotypic indicators for chronic obstructive airway disorders in older adults.

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