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Randomized Controlled Trial
. 2018 Dec;26(12):1658-1665.
doi: 10.1016/j.joca.2018.08.005. Epub 2018 Aug 23.

Biomarkers of inflammation - LBP and TLR- predict progression of knee osteoarthritis in the DOXY clinical trial

Z Y Huang  1 , E Perry  2 , J L Huebner  3 , B Katz  4 , Y-J Li  5 , V B Kraus  6
Affiliations
Randomized Controlled Trial

Biomarkers of inflammation - LBP and TLR- predict progression of knee osteoarthritis in the DOXY clinical trial

Z Y Huang et al. Osteoarthritis Cartilage. 2018 Dec.

Abstract

Objective: To evaluate systemic inflammatory biomarkers in symptomatic knee osteoarthritis (OA) and their association with radiographic and biochemical OA progression.

Methods: Lipopolysaccharide (LPS) binding protein (LBP), soluble Toll-like receptor 4 (sTLR4) and interleukin 6 (IL-6) were measured in plasma of 431 knee OA patients from the doxycycline (DOXY) trial at baseline and 18 months. Plasma lipopolysaccharide and lipopolysaccharide binding protein (LBP) were also measured at 12 months. As a biochemical indicator of disease activity and OA progression, urinary (u) C-telopeptide of Type II collagen (uCTX-II) was measured in samples collected at baseline and 18 months. Change over 16 months in radiographic tibiofemoral joint space width (JSW in mm) and joint space narrowing (JSN≥0.5 mm) were used to indicate radiographic OA progression. Change over 18 months for uCTX-II was used as a secondary outcome. Both univariate and multivariable regression analyses were performed to test the association between Z-score transformed biomarkers and outcomes.

Results: Baseline LBP and time-integrated concentration (TIC) of LBP over 12 and 18 months were associated with worsening joint space width (JSW) (parameter estimates: -0.1 to -0.07) and JSN (OR: 1.32 to 1.42) adjusting for treatment group, age, body mass index (BMI) and corresponding baseline radiographic measures. Baseline sTLR4 and TIC over 18 months were associated with change in uCTX-II over 18 months (adjusted parameter estimates: 0.0017 to 0.0020). Results were not modified by treatment with doxycycline.

Conclusion: Plasma LBP and sTLR4 were associated with knee OA progression over 16-18 months. These results lend further support for a role of systemic low-grade inflammation in the pathogenesis of knee OA progression.

Keywords: Biomarkers; Inflammation; Knee osteoarthritis; LBP; Path analysis; sTLR4.

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Conflict of interest statement

Conflict of Interest

None of the authors have competing interests to disclose. No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

Figures

Figure 1.
Figure 1.
Study flow diagram.
Figure 2.
Figure 2.
Network plot including demographics, biomarkers and outcomes of interest. The network plot represents one-to-one Pearson correlations performed with z-score normalized biomarkers and log10 transformed uCTX-II to satisfy assumptions of normality. Positive correlation (>0.1)-red, negative correlation (<−0.1)-green. For the measurements derived from the same biomarkers (e.g. LBP baseline, TIC(LBP)12, TIC(LBP)12), we do not show their correlation since we are mainly interested in correlation among different biomarkers and other measures.
See this image and copyright information in PMC

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