Association of bone turnover markers and craving reduction in patients with alcohol use disorder during withdrawal: Exploring the role of bone-brain axis.

Background: Alcohol use disorder (AUD) is associated with imbalanced bone turnover and psychological symptoms, but the relationship between bone and brain remains unclear. The study analyzed serum levels of a bone formation marker, procollagen type 1 N-terminal propeptide (P1NP), and bone resorption marker, C-terminal telopeptide of type I collagen (CTX-1), in AUD patients before and after 2 weeks of alcohol withdrawal and investigated their correlation with psychological symptoms.

Methods: Ninety patients with AUD and 117 healthy controls were recruited. P1NP and CTX-1 levels were measured using Enzyme-Linked Immunosorbent Assay. The Penn Alcohol Craving Scale (PACS), Beck Depression Inventory (BDI), and Beck Anxiety Inventory (BAI) were assessed in the AUD group at baseline, week 1, and week 2 of withdrawal.

Results: Baseline CTX-1 levels, along with the CTX-1/P1NP and P1NP/CTX-1 ratio, were higher in the AUD group than controls. Over the 2-week withdrawal, PACS, BDI, and BAI scores demonstrated significant reductions. P1NP (p < 0.001) and P1NP/CTX-1 ratio increased (p < 0.001), while CTX-1/P1NP ratio decreased (p < 0.001), indicating a propensity toward bone formation. Univariate analysis revealed that reductions in PACS, BDI, and BAI scores during withdrawal correlated with increased P1NP levels and decreased CTX-1/P1NP ratios. However, multivariate analysis indicated that only PACS score reductions correlated with these changes.

Conclusions: Bone metabolism shifted toward increased bone formation and decreased bone resorption during 2-week alcohol withdrawal. The correlation between improvements in bone turnover markers and reduction in craving scores during withdrawal supports the concept of the bone-brain axis.