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2017 ; 101
(4
): 375-383
Nephropedia Template TP
gab.com Text
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English Wikipedia
Autoantibodies to Osteoprotegerin are Associated with Low Hip Bone Mineral
Density and History of Fractures in Axial Spondyloarthritis: A Cross-Sectional
Observational Study
#MMPMID28534161
Hauser B
; Zhao S
; Visconti MR
; Riches PL
; Fraser WD
; Piec I
; Goodson NJ
; Ralston SH
Calcif Tissue Int
2017[Oct]; 101
(4
): 375-383
PMID28534161
show ga
Osteoporosis is a recognised complication of axial spondyloarthritis (axSpA) and
is thought to be due to functional impairment and the osteoclast-activating
effects of proinflammatory cytokines. The development of autoantibodies to OPG
(OPG-Ab) has been associated with severe osteoporosis and increased bone
resorption in rheumatoid arthritis. In this study, we screened for the presence
of OPG-Ab in axSpA and reviewed their clinical significance. We studied 134
patients, recruited from two centres in the United Kingdom. Their mean age was
47.5 years and 75% were male. Concentrations of OPG-Ab were related to bone
mineral density (BMD) and fracture history using linear and logistic regression
models adjusting for age, gender, disease duration and activity, body mass index
and bisphosphonate use. We detected OPG-Ab in 11/134 patients (8.2%). Femoral
neck and total hip BMD were significantly reduced in OPG-Ab positive patients
(0.827 vs. 0.967 g/cm(2), p = 0.008 and 0.868 vs. 1.028 g/cm(2), p = 0.002,
respectively). Regression analysis showed that the presence of OPG-Ab was
independently associated with total hip osteopenia (OR(adj) 24.2; 95% CI 2.57,
228) and history of fractures (OR(adj) 10.5; 95% CI 2.07, 53.3). OPG-Ab
concentration was associated with total hip BMD in g/cm(2) (ß = -1.15; 95% CI
-0.25, -0.04). There were no associations between OPG-Ab concentration and bone
turnover markers, but free sRANKL concentrations were lower in OPG-Ab-positive
patients (median 0.04 vs. 0.11 pmol/L, p = 0.050). We conclude that OPG-Ab are
associated with hip BMD and fractures in axSpA suggesting that they may
contribute to the pathogenesis of bone loss in some patients with this condition.