Evaluation of Factors II, VII, IX, X, and Proteins C and S, Following High-dose Vitamin K Supplementation
The purpose of this study is to evaluate factor levels of the pro coagulant factors II, VII, IX, X, and the anticoagulant factors protein C and S in healthy volunteers during the intake of elevated levels of vitamin K in order to investigate whether there is any evidence that high dose vitamin K intake increases plasma coagulation factor activity.
|Study Design:||Endpoint Classification: Pharmacokinetics Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
|Official Title:||Evaluation of Factors II, VII, IX, X, and Proteins C and S, Following High-dose Vitamin K Supplementation|
- Change in levels and activities due to vitamin K supplementation [ Time Frame: 4 weeks ] [ Designated as safety issue: No ]Levels and activities to be recorded at three time points: Factor II, Factor VII, Factor IX, Factor X, D-dimer, TAT complexes, Protein C and S, thrombin generation potential
|Study Start Date:||November 2009|
|Study Completion Date:||March 2012|
|Primary Completion Date:||March 2012 (Final data collection date for primary outcome measure)|
Experimental: All study participants
Three blood collections, one at baseline, one two weeks later, and the final blood collection 4 weeks from baseline, after taking Vitamin K orally for 14 days.
Dietary Supplement: Vitamin K, 20mg
Subjects will take 20mg vitamin K by mouth in capsule form everyday for 14 continuous days.
Other Name: Carlson Vitamin K2 Menatetrenone, in 5mg capsules
- Recruit 8 male healthy individuals with no prior history of arterial or venous thrombosis (2 each from each of the following age ranges: 20-34, 35-49, 50-64, >65).
- Visit 1: Measure baseline activity levels of Factor II, Factor VII, Factor IX, Factor X, and levels of D-Dimer, TAT complexes, protein C and S activities. Also measure thrombin generation potential. Collaboration with a research laboratory will be sought to also determine factor VIIa levels.
- Visit 2: Measure activity of Factor II, Factor VII, Factor IX, Factor X, levels of D-Dimer, TAT complexes, protein C and S activities and thrombin generation potential at the end of the 2 week period.
- Have each individual consume 20 mg of Vitamin K2 orally per day for two weeks.
- Visit 3: Measure Factor II, Factor VII, Factor IX, Factor X, D-Dimer, TAT complexes, protein C and S activities and thrombin generation potential at the end of the 2 week period.
- Total length of study is 4 weeks.
- Analyze the data sets for changes in levels / activities due to Vitamin K supplementation.
|United States, North Carolina|
|University of North Carolina at Chapel Hill|
|Chapel Hill, North Carolina, United States, 27599|
|Principal Investigator:||Stephan Moll, MD||UNC Chapel Hill Department of Medicine, Division of Hematology|