Abstract
Introduction
Vitamin K has been implicated in increased bone fracture risk. Despite a potential role of vitamin K in bone, little is known about the effects of altered dietary phylloquinone intake on the underlying components of bone and mineral metabolism.
Methods
A 84-day in-house dietary phylloquinone (vitamin K) depletion–repletion study was undertaken in 21 postmenopausal women (mean age: 70 years) to assess the effects of altered vitamin K status on intestinal calcium (Ca) absorption, urinary and serum Ca and phosphorus (P), serum calcemic hormones, and serum biomarkers of bone turnover [osteocalcin and N-telopeptide type 1 collagen cross-links (NTx)] and the response to 1,25-dihydroxyvitamin D treatment (1 μg/day×7 d).
Results
The group receiving calcitriol treatment (n=11) had higher Ca absorption, urinary Ca, urinary and serum P and serum osteocalcin and lower serum parathyroid hormone (PTH).There were no significant effects of acute (4-week) phylloquinone depletion on response to 1,25-dihydroxyvitamin D treatment or on measures of bone formation or mineral metabolism. However, phylloquinone treatment had a significant effect (p<0.04) on serum NTx. Phylloquinone repletion, up to five times (450 μg phylloquinone per day) the currently recommended adequate intake level of dietary phylloquinone for women, significantly reduced serum NTx (16.8±0.9 nmol bone collagen equivalents (BCE) per liter following repletion vs 18.4±1.1 nmol BCE per liter following depletion; p< 0.01).
Conclusions
These findings suggest that altering vitamin K status in postmenopausal women by manipulating phylloquinone intake does not have an acute affect on intestinal Ca absorption, renal mineral excretion, or bone formation, but high phylloquinone intake may modestly reduce bone resorption. The impact of high phylloquinone intake on bone mineral density and fracture risk needs to be ascertained in randomized clinical trials.
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Acknowledgements
The authors wish to thank the staff of the Nutrition Evaluation Laboratory and the Metabolic Research Unit of the Jean Mayer USDA-HNRCA and the volunteer subjects for their contribution to the study. This work was supported by the U.S. Department of Agriculture, under Cooperative Agreement no. 58-1950-9-001, and by the Cooperative State Research, Education, and Extension Service under agreement No 99-35200-7583 (RJW). LM was supported in part by a postdoctoral fellowship grant from FAPESP-Brazil, under agreement no. 98/6151-9. MRDO was under a research fellowship from CNPq-Brazil no. 300318/97-9. Any options, findings, conclusion, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.
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Martini, L.A., Booth, S.L., Saltzman, E. et al. Dietary phylloquinone depletion and repletion in postmenopausal women: effects on bone and mineral metabolism. Osteoporos Int 17, 929–935 (2006). https://doi.org/10.1007/s00198-006-0086-1
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DOI: https://doi.org/10.1007/s00198-006-0086-1