Determinants of Vitamin K Metabolism

Aging Clinical Trial

Official title:

Dietary and Non-dietary Components of Vitamin K Metabolism

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00336232
• Other study ID #: R01DK069341
• Status: Completed
• Phase: N/A
• Start date: May 2006
• Est. completion date: July 2009

Study information

• Verified date: November 2023
• Source: Tufts University
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to learn how the body responds to different amounts of vitamin K in the diet in order to understand the roles that vitamin K may have in the body. We also need to determine if older adults need more or less vitamin K in their diet compared to younger adults in order to maintain normal body stores of vitamin K.

Description:

Vitamin K has a role in bone health, but little is known about vitamin K metabolism in aging and in maintenance of bone mass. The limited understanding of vitamin K metabolism impedes the establishment of dietary recommendations for vitamin K, and the interpretation of results from clinical trials on vitamin K supplementation and bone health of women in a narrow age group. This study is the first to assess the role of dietary and other factors that influence the response to vitamin K status and bone turnover to vitamin K depletion and repletion in adults. This study also compares the absorption efficiency and body retention of vitamin K relative to current vitamin K status. Men and women [21 younger (18-40y) and 21 older (55+y)] will participate in a 62-d metabolic study, with a 5d run-in period, followed by a 28d dietary vitamin K restriction period (10 ug/d), and ending with a 28d dietary vitamin K supplementation period (500 ug/d). Coagulation times will be monitored during the dietary restriction period. Serial measurements of vitamin K status markers and of bone turnover markers will show the response of vitamin K to dietary manipulation for both age groups under identically controlled dietary conditions. Deuterium-labeled vitamin K in collards will be used to compare the absorption of vitamin K during a vitamin K-deplete state to that of a vitamin K-replete state. Vitamin K is transported in triglyceride-rich lipoproteins, which may vary among individuals due to differences in adiposity and lipid homeostasis. Therefore, measurement of body composition by Dual Energy X-Ray Absorptiometry (DXA) and plasma lipids will provide insight into the role of lipids in absorption and transport of vitamin K. The findings of this study are critical for the interpretation of the epidemiologic and clinical data used to determine the protective role vitamin K may have in chronic disease prevention.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 59
• Est. completion date: July 2009
• Est. primary completion date: July 2009
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 90 Years

Eligibility

Inclusion Criteria:

-

Exclusion Criteria:

• kidney, GI, or liver disease requiring treatment

• prescribed osteoporosis medications in the previous 3 months

• use of acid reducers more than twice per week

• blood clotting disorder and/or abnormal clotting time

• warfarin or anticoagulant use in the previous 12 months

• diabetes

• smoking

• hormone therapy in the previous 3 months

• oral contraceptive use in the previous 3 months; pregnancy

• strict vegetarian diet

Related Conditions & MeSH terms

• Aging
• Osteoporosis

Intervention

Drug:
• Vitamin K
phylloquinone (vitamin K1) 500 mcg daily in third month

Locations

Country	Name	City	State
United States	Jean Mayer United States Department of Agriculture Human Nutrition Research Center on Aging at Tufts University	Boston	Massachusetts

Sponsors (1)

Lead Sponsor	Collaborator
Tufts University

Country where clinical trial is conducted

United States, 

References & Publications (6)

Booth SL, Lichtenstein AH, O'Brien-Morse M, McKeown NM, Wood RJ, Saltzman E, Gundberg CM. Effects of a hydrogenated form of vitamin K on bone formation and resorption. Am J Clin Nutr. 2001 Dec;74(6):783-90. doi: 10.1093/ajcn/74.6.783. — View Citation

Booth SL, Martini L, Peterson JW, Saltzman E, Dallal GE, Wood RJ. Dietary phylloquinone depletion and repletion in older women. J Nutr. 2003 Aug;133(8):2565-9. doi: 10.1093/jn/133.8.2565. — View Citation

Erkkila AT, Lichtenstein AH, Dolnikowski GG, Grusak MA, Jalbert SM, Aquino KA, Peterson JW, Booth SL. Plasma transport of vitamin K in men using deuterium-labeled collard greens. Metabolism. 2004 Feb;53(2):215-21. doi: 10.1016/j.metabol.2003.08.015. — View Citation

Harrington DJ, Soper R, Edwards C, Savidge GF, Hodges SJ, Shearer MJ. Determination of the urinary aglycone metabolites of vitamin K by HPLC with redox-mode electrochemical detection. J Lipid Res. 2005 May;46(5):1053-60. doi: 10.1194/jlr.D400033-JLR200. Epub 2005 Feb 1. — View Citation

Traber MG, Leonard SW, Bobe G, Fu X, Saltzman E, Grusak MA, Booth SL. alpha-Tocopherol disappearance rates from plasma depend on lipid concentrations: studies using deuterium-labeled collard greens in younger and older adults. Am J Clin Nutr. 2015 Apr;101 — View Citation

Truong JT, Fu X, Saltzman E, Al Rajabi A, Dallal GE, Gundberg CM, Booth SL. Age group and sex do not influence responses of vitamin K biomarkers to changes in dietary vitamin K. J Nutr. 2012 May;142(5):936-41. doi: 10.3945/jn.111.154807. Epub 2012 Mar 21. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Plasma Phylloquinone	Plasma phylloquinone in response to phylloquinone depletion and repletion	2 months

External Links

•   Jean Mayer USDA Human Nutrition Research Center on Aging site