The vitamin D receptor expression in skeletal muscle of women with distal radius fracture
We evaluated the vitamin D receptor (VDR) expression in the forearm flexor muscle of women with distal radius fracture. High VDR expression was associated with low appendicular lean mass index.
We aimed to evaluate the relationship between the VDR expression in the muscle cell and the muscle mass in women with a distal radius fracture (DRF).
We prospectively recruited 45 women over 50 years of age (mean age, 66 years) with DRF and acquired biopsy of the forearm flexor muscle. The muscle cross-sectional area (CSA) and VDR expression were measured using immunohistochemistry staining. The clinical parameters including grip strength, gait speed, body mass index (BMI), bone mineral density (BMD), and serum vitamin D levels were compared between patients grouped by appendicular lean mass index and were correlated with the VDR expression.
Twelve patients (27%) showed a decreased appendicular lean mass index, less than the cut-off value of 5.4 kg/m2 which was suggested by the Asian Working Group for Sarcopenia. Patients with a low appendicular lean mass index had significantly lower muscle CSA (p = 0.037), but a higher VDR expression (p = 0.045) than those with higher indices. VDR expression was negatively correlated with BMI (r = − 0.417, p = 0.004) and appendicular lean mass index (r = − 0.316, p = 0.044).
DRF patients with low appendicular lean mass index presented high VDR expression and low CSA in forearm muscle cells. This suggests that the VDR expression might be upregulated in the attempt to compensate for the decreasing muscle mass. Further studies are necessary to explore the role of VDR in the progression of sarcopenia.
KeywordsVitamin D Vitamin D receptor Distal radius fracture Sarcopenia Skeletal muscle
This study was supported by a research fund (2015R1D1A1A01058562) from the National Research Foundation of Korea and in part by a basic research fund (14-2015-001) from the authors’ institution.
Compliance with ethical standards
Conflicts of interest
Ethics approval and consent to participate
The Seoul National University Bundang Hospital Institutional Review Board (SNUBH IRB) reviewed the protocol and approved the study (B-1501-282-002). All participants provided informed written consents.
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