IL-6-independent association of elevated serum neopterin levels with prevalent frailty in community-dwelling older adult.

Leng, S.X., Tian, X., Matteini, A., Li, H., Hughes, J., Jain, A., Walston, J.D., Fedarko, N.S.
Journal   Age Ageing.
Species  
Analytes Measured   IL-6
Matrix Tested   Serum
Year   2011
Volume   40
Page Numbers   475-481
Application   Cytokines and Chemokines
Abstract
BACKGROUND: Neopterin is a monocyte/macrophage-derived immune activation marker and its levels increase with age. Frailty is an important clinical syndrome of old age. Previous studies have shown significant association between elevated interleukin-6 (IL-6) levels and frailty. The objective of this study was to evaluate IL-6-independent association of serum neopterin levels with prevalent frailty.

METHODS: this is a cross-sectional study in community-dwelling older adults recruited from residential and retirement communities in Baltimore, MD, USA. Frailty was determined using validated screening criteria. Serum neopterin and IL-6 levels were measured using standard enzyme-linked immunosorbent assay. Pearson correlation and multivariate linear regression analysis was performed to assess the relationship between log(neopterin) and log(IL-6). Odds ratios (ORs) for frailty were calculated using log(neopterin) and log(IL-6) as continuous measures and across tertiles of neopterin and IL-6 levels, adjusting for age, race, sex, education and body mass index.

RESULTS: one hundred and thirty-three individuals with a mean age of 84 years (range 72-97) completed the study. Neopterin levels were significantly higher in frail older adults than those in non-frail controls [median: 8.94 versus 8.35 nM, respectively, P < 0.001 t-test on log(neopterin)]. Log(neopterin) was significantly associated with prevalent frailty, adjusting for log(IL-6). Participants in the top tertile of neopterin had OR of 3.80 [95% confidence interval (CI) = 1.36-10.6, P < 0.01] for frailty. As expected, participants in the top tertile of IL-6 had OR of 3.29 (95% CI = 1.21-7.86, P < 0.05) for frailty. Log(neopterin) correlated with log(IL-6) (correlation coefficient = 0.19, P < 0.05). Moreover, OR for participants in the top neopterin tertile remained significant after adjusting for IL-6 (OR = 3.97, 95% CI = 1.15-13.72, P < 0.05).

CONCLUSION: elevated neopterin levels had IL-6-independent association with prevalent frailty, suggesting potential monocyte/macrophage-mediated immune activation in the frail elderly.

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IL-6
V-PLEX Human Cytokine 30-Plex Kit
Eotaxin, Eotaxin-3, GM-CSF, IFN-γ, IL-1α, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-7, IL-8, IL-8 (HA), IL-10, IL-12/IL-23p40, IL-12p70, IL-13, IL-15, IL-16, IL-17A, IP-10, MCP-1, MCP-4, MDC, MIP-1α, MIP-1β, TARC, TNF-α, TNF-β, VEGF-A | Human
Multiplex
V-PLEX Human IL-6 Kit
IL-6 | Human
Singleplex
V-PLEX Human Proinflammatory Panel I (4-Plex)
IFN-γ, IL-1β, IL-6, TNF-α | Human
Multiplex
V-PLEX Human Proinflammatory Panel II (4-Plex)
IL-1β, IL-6, IL-8, TNF-α | Human
Multiplex
V-PLEX Mouse IL-6 Kit
IL-6 | Mouse
Singleplex
V-PLEX Plus Human Cytokine 30-Plex Kit
Eotaxin, Eotaxin-3, GM-CSF, IFN-γ, IL-1α, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-7, IL-8, IL-8 (HA), IL-10, IL-12/IL-23p40, IL-12p70, IL-13, IL-15, IL-16, IL-17A, IP-10, MCP-1, MCP-4, MDC, MIP-1α, MIP-1β, TARC, TNF-α, TNF-β, VEGF-A | Human
Multiplex
V-PLEX Plus Human IL-6 Kit
IL-6 | Human
Singleplex
V-PLEX Plus Human Proinflam. Panel I (4-Plex)
IFN-γ, IL-1β, IL-6, TNF-α | Human
Multiplex
V-PLEX Plus Human Proinflam. Panel II (4-Plex)
IL-1β, IL-6, IL-8, TNF-α | Human
Multiplex
V-PLEX Plus Mouse IL-6 Kit
IL-6 | Mouse
Singleplex
V-PLEX Plus Proinflammatory Panel 1 Human Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-6, IL-8, IL-10, IL-12p70, IL-13, TNF-α | Human
Multiplex
V-PLEX Plus Proinflammatory Panel1 Mouse Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, IL-12p70, KC/GRO, TNF-α | Mouse
Multiplex
V-PLEX Plus Rat IL-6 Kit
IL-6 | Rat
Singleplex
V-PLEX Proinflammatory Panel 1 Human Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-6, IL-8, IL-10, IL-12p70, IL-13, TNF-α | Human
Multiplex
V-PLEX Proinflammatory Panel 1 Mouse Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, IL-12p70, KC/GRO, TNF-α | Mouse
Multiplex
V-PLEX Rat IL-6 Kit
IL-6 | Rat
Singleplex
Proinflammatory Panel 1 Human Control Pack
IFN-γ, IL-1β, IL-2, IL-4, IL-6, IL-8, IL-10, IL-12p70, IL-13, TNF-α | Human
Proinflammatory Panel 1 Mouse Control Pack
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, IL-12p70, KC/GRO, TNF-α | Mouse
Proinflammatory Panel 1 Rat Control Pack
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-10, IL-13, KC/GRO, TNF-α | Rat
Human ProInflammatory-4 II Tissue Culture Kit
IL-1β, IL-6, IL-8, TNF-α | Human
Multiplex
Human IL-6 Tissue Culture Kit
IL-6 | Human
Singleplex
Human ProInflammatory 7-Plex Tissue Culture Kit
IFN-γ, IL-1β, IL-6, IL-8, IL-10, IL-12p70, TNF-α | Human
Multiplex
Human ProInflammatory 9-Plex Tissue Culture Kit
GM-CSF, IFN-γ, IL-1β, IL-2, IL-6, IL-8, IL-10, IL-12p70, TNF-α | Human
Multiplex
Human ProInflammatory-4 I Tissue Culture Kit
IFN-γ, IL-1β, IL-6, TNF-α | Human
Multiplex
Canine ProInflammatory Panel 3 Ultra-Sensitive Kit
IL-2, IL-6, IL-8, TNF-α | Canine
Multiplex
MA6000 Rat IL-6 384 Tissue Culture Kit
IL-6 | Rat
Singleplex
Mouse ProInflammatory 7-Plex Tissue Culture Kit
IFN-γ, IL-1β, IL-6, IL-10, IL-12p70, KC/GRO, TNF-α | Mouse
Multiplex
MA6000 Mouse IL-6 384 Tissue Culture Kit
IL-6 | Mouse
Singleplex
MS6000 Human ProInflammatory-4 II 384 Tissue Culture Kit
IL-6, IL-8 | Human
Multiplex
Mouse IL-6 Tissue Culture Kit
IL-6 | Mouse
Singleplex
V-PLEX Mouse Cytokine 29-Plex Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-9, IL-10, IL-12p70, IL-15, IL-16, IL-17A, IL-17A/F, IL-17C, IL-17E/IL-25, IL-17F, IL-21, IL-22, IL-23, IL-27p28/IL-30, IL-31, IL-33, IP-10, KC/GRO, MCP-1, MIP-1α, MIP-2, MIP-3α, TNF-α | Mouse
Multiplex
U-PLEX Biomarker Group 1 NHP Assays
CTACK, ENA-78, Eotaxin, Eotaxin-2, Eotaxin-3, FLT3L, Fractalkine, G-CSF, GM-CSF, GRO-α, I-309, IFN-α2a, IFN-γ, IL-1α, IL-1β, IL-1RA, IL-2, IL-2Rα, IL-4, IL-5, IL-6, IL-7, IL-8, IL-9, IL-10, IL-12/IL-23p40, IL-12p70, IL-13, IL-15, IL-16, IL-17A, IL-17A/F, IL-17B, IL-17C, IL-17D, IL-17F, IL-18, IL-22, IL-23, IP-10, I-TAC, MCP-1, MCP-2, MCP-3, MCP-4, M-CSF, MDC, MIF, MIP-1α, MIP-1β, MIP-3α, MIP-3β, MIP-5, SDF-1α, TARC, TGF-β1, TGF-β2, TGF-β3, TNF-α, TNF-β, TPO, TRAIL, VEGF-A, YKL-40 | Non-human primate
MA6000 Human IL-6 384 Tissue Culture Kit
IL-6 | Human
Singleplex
V-PLEX Plus Mouse Cytokine 29-Plex Kit
IFN-γ, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-9, IL-10, IL-12p70, IL-15, IL-16, IL-17A, IL-17A/F, IL-17C, IL-17E/IL-25, IL-17F, IL-21, IL-22, IL-23, IL-27p28/IL-30, IL-31, IL-33, IP-10, KC/GRO, MCP-1, MIP-1α, MIP-2, MIP-3α, TNF-α | Mouse
Multiplex
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