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/objectives: Rheumatoid arthritis (RA) is associated with decreased bone mass and increased risk of fractures. However, mechanisms underlying this association are not fully understood. Thus, we quantified serum levels of sclerostin, a glycoprotein that inhibits bone formation, and determined its association with bone mineral density (BMD) and disease progression in RA patients. Method: Forty-eight women (aged 25-83 years) with RA and 15 healthy women (aged-matched) were recruited to determine the association between serum sclerostin and BMD at femoral and vertebral level (L1-L4), by DEXA, body mass index (BMI), disease duration, disease activity score (DAS 28), C-Reactive protein and rheumatoid factor. Spearman correlation analyses were performed to determine the association between sclerostin and BMD and the additional variables listed above. A multivariate analysis was used to adjust for confounders. Results: Serum sclerostin was not significantly different between RA patients and controls (22.59 ± 2.13 vs 19.49 ± 3.1 pmol/L). A positive correlation was found between serum sclerostin and femoral BMD (r=0.343, P=0.017), but not BMD at vertebral level. Using a multivariate analysis, the positive correlation was conserved between serum sclerostin and femoral BMD (P=0.002). There was not a significant association between sclerostin and the other variables studied. Conclusions: While serum sclerostin levels were not significantly different between RA patients and controls, this study showed a positive correlation between serum sclerostin and femoral BMD in a small Mexican sample of women with RA. Further studies are needed to evaluate whether serum sclerostin is associated with risk of fracture in RA patients.

Association between Sclerostin and Bone Mineral Density in a Mexican Sample of Women with Rheumatoid Arthritis: A Pilot Study