Osteoprotegerin Levels Decrease in Abstinent Alcohol-Dependent Patients.

Background: Osteoprotegerin (OPG) is a parameter of increasing interest in the search for pathophysiological mechanisms of reduced bone mineral density (BMD). It has been shown to be increased in alcohol-dependent subjects. In our study, we wanted to examine whether changes in OPG and receptor activator of the nuclear factor-kappa B ligand (RANKL) levels during an 8-week abstinence period in alcohol-dependent patients treated in an alcohol rehabilitation clinic would occur and whether alcohol-related variables, smoking, status, or physical activity prior to the study served as an influence on BMD and on OPG/RANKL levels. Methods: Forty-three patients, who were abstinent not longer than a week, were included in the study. OPG and RANKL as well as other markers of bone metabolism were measured at baseline, and after 8 weeks of treatment, BMD was measured once. Results: OPG levels decreased significantly, while osteocalcin, a marker of bone formation, increased significantly. RANKL as well as RANKL/OPG ratio, Serum CrossLaps, and all examined hormones showed no significant changes over time. Inflammatory parameters showed a significant reduction after 8 weeks. We detected no influence of potentially confounding variables of alcohol dependency on the course of OPG or other laboratory values. Conclusions: Our results could point to the well-known risk for reduced BMD in these patients being reversible with abstinence through an excess of bone formation. We also confirmed earlier findings that inflammatory processes play a role in the pathogenesis of alcohol-induced disturbances in bone metabolism.