Role of Parathyroid Hormone in Bone Fragility of Postmenopausal Women with Vitamin D Insufficiency |
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Authors: | Mika Yamauchi Hiroshi Kaji Kiyoko Nawata Shin Takaoka Toru Yamaguchi Toshitsugu Sugimoto |
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Institution: | (1) Internal Medicine 1, Shimane University Faculty of Medicine, Izumo, Japan;(2) Division of Diabetes and Endocrinology, Department of Internal Medicine, Kobe University Graduate School of Medicine, 7-5-2 Kusunoki-cho, Chuo-ku Kobe, 650-0017, Japan;(3) Division of Cellular and Molecular Medicine, Department of Physiology and Cellular Biology, Kobe University Graduate School of Medicine, Kobe, Japan; |
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Abstract: | Vitamin D insufficiency is related to an increase in PTH, which might be critical for an increase in bone fragility. However,
the role of endogenous PTH in vitamin D insufficiency-induced fracture risk remains unclear. The present study was performed
to examine the relationships among vitamin D insufficiency, bone fragility, and PTH in 202 Japanese postmenopausal women.
Serum 25-hydroxyvitamin D (25OH]D) levels were measured. The percentages of subjects with 25(OH)D levels below 10, 15, and
20 ng/ml were 5.0, 41.0, and 80.7%, respectively. Serum 25(OH)D levels were negatively related to age and serum levels of
Cr and PTH; they were positively related to bone mineral density (BMD). In multiple regression analysis, BMD was significantly
related to 25(OH)D levels when adjusted for age, body mass index (BMI), and serum levels of Cr and PTH. Multiple logistic
regression analysis showed that lower 25(OH)D levels were significantly related to prevalent fracture risk when adjusted for
age, BMI, serum levels of Cr and PTH, as well as femoral neck BMD. The proportion of subjects with prevalent fractures was
significantly higher in the group with lower PTH and lower 25(OH)D than in the group with lower PTH and higher 25(OH)D or
higher PTH and higher 25(OH)D. In conclusion, vitamin D insufficiency was found to be related to prevalent fracture risk independently
of PTH. Functional hypoparathyroidism, rather than functional hyperparathyroidism, might be a risk factor for bone fragility
in vitamin D insufficiency. |
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