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Assessment of bone remodelling in childhood-onset systemic lupus erythematosus

To identify predictors of bone remodelling in children and young adults with SLE. Ninety subjects with SLE aged 8-22 years underwent yearly measurements of height, bone age, bone turnover markers, serum Type I IFNs, SLEDAI and BMD. Predictors of bone turnover were examined using serum osteocalcin as...

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Published in:Rheumatology (Oxford, England) England), 2011-03, Vol.50 (3), p.611-619
Main Authors: BAKER-LEPAIN, Julie C, NAKAMURA, Mary C, SHEPHERD, John, VON SCHEVEN, Emily
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description To identify predictors of bone remodelling in children and young adults with SLE. Ninety subjects with SLE aged 8-22 years underwent yearly measurements of height, bone age, bone turnover markers, serum Type I IFNs, SLEDAI and BMD. Predictors of bone turnover were examined using serum osteocalcin as a marker of bone formation and both serum tartrate-resistant acid phosphatase (TRAP) and urine N-telopeptide (NTx) as markers of bone resorption. Subjects demonstrated short stature, high BMI and bone age delay. A spine BMD Z-score of less than -2.0 was seen in 16.1% of subject visits. Serum osteocalcin was negatively correlated with glucocorticoid dose (Spearman rank correlation coefficient R = -0.34, P 
doi_str_mv 10.1093/rheumatology/keq307
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Ninety subjects with SLE aged 8-22 years underwent yearly measurements of height, bone age, bone turnover markers, serum Type I IFNs, SLEDAI and BMD. Predictors of bone turnover were examined using serum osteocalcin as a marker of bone formation and both serum tartrate-resistant acid phosphatase (TRAP) and urine N-telopeptide (NTx) as markers of bone resorption. Subjects demonstrated short stature, high BMI and bone age delay. A spine BMD Z-score of less than -2.0 was seen in 16.1% of subject visits. Serum osteocalcin was negatively correlated with glucocorticoid dose (Spearman rank correlation coefficient R = -0.34, P &lt; 0.0001) but was not associated with SLEDAI after adjustment for confounders. Serum TRAP was negatively associated with SLEDAI, even after controlling for confounders (P = 0.04). Similar results were obtained for urine NTx. There was a negative association between TRAP and serum IFN-β (P = 0.03). In this population of children and young adults with moderate lupus disease activity, glucocorticoid dose was a negative predictor of bone formation, whereas lupus disease activity was not. Interestingly, lupus disease activity was a negative predictor of bone resorption, suggesting that lupus disease activity is not the primary factor contributing to the bone deficits of childhood-onset SLE. 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Ninety subjects with SLE aged 8-22 years underwent yearly measurements of height, bone age, bone turnover markers, serum Type I IFNs, SLEDAI and BMD. Predictors of bone turnover were examined using serum osteocalcin as a marker of bone formation and both serum tartrate-resistant acid phosphatase (TRAP) and urine N-telopeptide (NTx) as markers of bone resorption. Subjects demonstrated short stature, high BMI and bone age delay. A spine BMD Z-score of less than -2.0 was seen in 16.1% of subject visits. Serum osteocalcin was negatively correlated with glucocorticoid dose (Spearman rank correlation coefficient R = -0.34, P &lt; 0.0001) but was not associated with SLEDAI after adjustment for confounders. Serum TRAP was negatively associated with SLEDAI, even after controlling for confounders (P = 0.04). Similar results were obtained for urine NTx. There was a negative association between TRAP and serum IFN-β (P = 0.03). In this population of children and young adults with moderate lupus disease activity, glucocorticoid dose was a negative predictor of bone formation, whereas lupus disease activity was not. Interestingly, lupus disease activity was a negative predictor of bone resorption, suggesting that lupus disease activity is not the primary factor contributing to the bone deficits of childhood-onset SLE. The potential protective role of IFN-β and the effects of SLE treatment on bone loss require further study.</description><subject>Adolescent</subject><subject>Adult</subject><subject>Age of Onset</subject><subject>Biological and medical sciences</subject><subject>Body Mass Index</subject><subject>Bone Remodeling</subject><subject>Child</subject><subject>Clinical Science</subject><subject>Diseases of the osteoarticular system</subject><subject>Female</subject><subject>Fundamental and applied biological sciences. 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source Oxford Journals Online; Alma/SFX Local Collection
subjects Adolescent
Adult
Age of Onset
Biological and medical sciences
Body Mass Index
Bone Remodeling
Child
Clinical Science
Diseases of the osteoarticular system
Female
Fundamental and applied biological sciences. Psychology
Humans
Interferon-beta - blood
Lupus Erythematosus, Systemic - blood
Lupus Erythematosus, Systemic - physiopathology
Male
Medical sciences
Predictive Value of Tests
Sarcoidosis. Granulomatous diseases of unproved etiology. Connective tissue diseases. Elastic tissue diseases. Vasculitis
Severity of Illness Index
Skeleton and joints
Vertebrates: osteoarticular system, musculoskeletal system
title Assessment of bone remodelling in childhood-onset systemic lupus erythematosus
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