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- W2057398892 abstract "Clinical studies indicate that the combination of vitamin D and dietary calcium supplementation is more effective for reducing fracture risk than either supplement alone. Our previous dietary studies demonstrated that an adequate serum 25-hydroxyvitamin D3 (25D) of 80 nmol/L or more reduces bone RANKL expression, osteoclastogenesis and maintains the optimal levels of trabecular bone volume (BV/TV%) in young rats. The important clinical question of the interaction between vitamin D status, dietary calcium intake and age remains unclear. Hence, 9 month-old female Sprague-Dawley rats (n = 5–6/group) were pair-fed a semi-synthetic diet containing varying levels of vitamin D (0, 2, 12 or 20 IU/day) and dietary calcium (0.1% or 1%) for 6 months. At 15 months of age, animals were killed, for biochemical and skeletal analyses. While changes to serum 25D were determined by both dietary vitamin D and calcium levels, changes to serum 1,25-dihydroxyvitamin D3 (1,25D) were consistently raised in animals fed 0.1% Ca regardless of dietary vitamin D or vitamin D status. Importantly, serum cross-laps levels were significantly increased in animals fed 0.1% Ca only when combined with 0 or 2 IUD/day of vitamin D, suggesting a contribution of both dietary calcium and vitamin D in determining bone resorption activity. Serum 25(OH)D3 levels were positively correlated with both femoral mid-diaphyseal cortical bone volume (R2 = 0.24, P < 0.01) and metaphyseal BV/TV% (R2 = 0.23, P < 0.01, data not shown). In multiple linear regressions, serum 1,25(OH)2D3 levels were a negative determinant of CBV (R2 = 0.24, P < 0.01) and were not a determinant of metaphyseal BV/TV% levels. These data support clinical data that reduced bone resorption and increased bone volume can only be achieved with adequate 25D levels in combination with high dietary calcium and low serum 1,25D levels. This article is part of a Special Issue entitled ‘16th Vitamin D Workshop’." @default.
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- W2057398892 date "2014-10-01" @default.
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- W2057398892 title "Adequate dietary vitamin D and calcium are both required to reduce bone turnover and increased bone mineral volume" @default.
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- W2057398892 doi "https://doi.org/10.1016/j.jsbmb.2013.11.009" @default.
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