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pubmed-article:17267207pubmed:abstractTextTo study the role of vitamin D to optimise bone architecture, we have developed an animal model to investigate the effects of frank vitamin D-deficiency as well as graded depletion of circulating 25-hydroxyvitamin D(3) (25D) levels on the skeleton. Rats fed on dietary vitamin D levels from 0 to 500 ng/day achieved diet-dependent circulating levels of 25D ranging from 11 to 115 nmol/L. Levels of serum 1,25-dihydroxyvitamin D(3) (1,25D) increased as dietary vitamin D increased between 0 and 200 ng/day at which point a maximum level was achieved and retained with higher vitamin D intakes. The renal levels of 25-hydroxyvitamin D-1alpha-hydroxylase (CYP27B1) mRNA were highest in animal groups fed on vitamin D between 0 and 300 ng/day. In contrast, renal 25-hydroxyvitamin D 24-hydroxylase (CYP24) mRNA levels increased as dietary vitamin D increased achieving maximum levels in animals receiving 500 ng vitamin D/day. This animal model of vitamin D depletion is suitable to provide invaluable information on the serum levels of 25D and dietary calcium intake necessary for optimal bone structure. Such information is essential for developing nutritional recommendations to reduce the incidence of osteoporotic hip fractures.lld:pubmed
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pubmed-article:17267207pubmed:dateRevised2008-8-16lld:pubmed
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pubmed-article:17267207pubmed:year2007lld:pubmed
pubmed-article:17267207pubmed:articleTitle25-Hydroxyvitamin D requirement for maintaining skeletal health utilising a Sprague-Dawley rat model.lld:pubmed
pubmed-article:17267207pubmed:affiliationEndocrine Bone Research Laboratory, Hanson Institute, Institute of Medical and Veterinary Science, Frome Road, Adelaide, SA 5000, Australia.lld:pubmed
pubmed-article:17267207pubmed:publicationTypeJournal Articlelld:pubmed
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