Plasma inflammatory mediators associated with bone metabolism in COPD.
ABSTRACT The association of osteoporosis with COPD is well established, but the relationship between systemic inflammatory mediators and bone metabolism has not been explored. Plasma samples from 40 COPD patients awaiting lung transplantation were analyzed for 27 inflammatory mediators using a multiplex protein array. C-telopeptide type I collagen (CTx), a marker of bone resorption, was measured with ELISA, and N-terminal procollagen propeptide (P1NP), a marker of bone formation, was ascertained with a radioimmunoassay. Associations between inflammatory mediators versus CTx and P1NP with adjustments for steroid and bisphosphonate use were determined. Mean age was 59 years (+/- 6) and FEV(1) was 23.5% (+/- 8.3%) predicted. Ninety-five percent of the subjects had low bone mineral density measured by dual x-ray absorptiometry (DXA). Tumor necrosis factor alpha and interleukin 4 were positively associated with CTx and P1NP. RANTES and eotaxin were inversely associated with CTx and P1NP. Interleukin 2 and interferon gamma were also directly associated with P1NP. Biologically plausible systemic mediators are associated with bone metabolism in patients with severe COPD, offering potential insight into risk factors and underlying mechanisms of bone disease. Furthermore, they may be useful in monitoring disease activity, and serve as targets for biological therapy.
Bon
Jessica M
JM
Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA. bonjm@upmc.edu
Zhang
Yingze
Y
Duncan
Steven R
SR
Pilewski
Joseph M
JM
Zaldonis
Diana
D
Zeevi
Adriana
A
McCurry
Kenneth R
KR
Greenspan
Susan L
SL
Sciurba
Frank C
FC
D015502:Absorptiometry, Photon; D000328:Adult; D000368:Aged; D015415:Biomarkers / Q000097:blood; D001842:Bone and Bones / Q000378:metabolism*; D024042:Collagen Type I / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D018836:Inflammation Mediators / Q000097:blood*; D015847:Interleukin-4 / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010024:Osteoporosis / Q000097:blood* / Q000209:etiology; D011347:Procollagen; D011379:Prognosis; D029424:Pulmonary Disease, Chronic Obstructive / Q000097:blood* / Q000150:complications; D011863:Radioimmunoassay; D012189:Retrospective Studies; D012307:Risk Factors; D014409:Tumor Necrosis Factor-alpha / Q000097:blood*
D015415:Biomarkers; D024042:Collagen Type I; D018836:Inflammation Mediators; D011347:Procollagen; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4