Introduction: Vitamin D plays a key role in maintaining calcium homeostasis and skeletal health. The liver is critically involved in vitamin D metabolism, as 25-hydroxyvitamin D₃ (25(OH)D₃) is synthesized in the liver. Therefore liver dysfunction may lead to vitamin D deficiency and bone problems. The aim of this study was to examine vitamin D status and bone turnover markers in hepatitis B patients from northeastern China.
Methods: We recruited 39 patients with hepatitis B (23 noncirrhotic and 16 cirrhotic) and 48 healthy controls in Shenyang, a metropolitan city in northeastern China, and measured serum 25(OH)D₃ levels and serum and urinary bone turnover markers in these subjects.
Results: Serum 25(OH)D₃ levels in the patients with or without cirrhosis were markedly lower compared to the nonhepatitis controls (19.2 ± 1.2 and 18.5 ± 1.3 vs. 31.6 ± 1.3 nmol/L control), whereas serum and urinary bone turnover markers (alkaline phosphatase, C-terminal telopeptide of type I collagen, and pyridinoline) were significantly higher in these patients than in the controls. Moreover, serum levels of osteoprotegerin, a bone mass-regulating protein, were substantially reduced in the patients, with the lowest seen in patients with cirrhosis (2.7 ± 1.1 and 1.4 ± 0.4 vs. 3.4 ± 0.7 pg/mL control). Serum 25(OH)D₃ levels below 30 nmol/L were positively correlated with serum osteoprotegerin levels in this cohort.
Conclusions: Severe vitamin D deficiency is very common in hepatitis B patients in northeastern China, which negatively impacts their bone health. These data strongly suggest a need to treat these patients with vitamin D supplementation to protect their bone health.