Vitamin K to Slow Progression of Dyslipidemia and Diabetes Risk (Vita-K 'n' Kids Study II)

November 18, 2019 updated by: Norman Pollock, Augusta University

Vitamin K to Slow Progression of Dyslipidemia and Diabetes Risk

Animal studies have found that vitamin K-dependent proteins matrix Gla protein and osteocalcin beneficially influence lipid and glucose metabolism, respectively. However, this concept has not been tested in humans at risk for dyslipidemia and diabetes risk. Vitamin K supplementation presents an opportunity to test the hypothesized link between the vitamin K-dependent proteins and markers of lipid and glucose metabolism. The investigators will conduct an 8-week vitamin K intervention (to manipulate carboxylation of matrix Gla protein and osteocalcin) and determine its effects on markers of dyslipidemia and diabetes risk. Sixty obese children will be randomly allocated to either the control group receiving placebo or the low-dose (45 mcg/d) or high-dose group (90 mcg/d) receiving vitamin K (menaquinone-7).

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Anticipated)

30

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Georgia
      • Augusta, Georgia, United States, 30912
        • Medical College of Georgia; Augusta University

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

6 years to 15 years (Child)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Age 8 to 17 years
  • Body mass index equal to or greater than 85th percentile for age and sex
  • Subject and parent/guardian understands the study protocol and agrees to comply with it
  • Informed Consent Form signed by the parent/guardian and assent signed by the subject

Exclusion Criteria:

  • Subjects using vitamin supplements containing vitamin k
  • Subjects with (a history of) metabolic or gastrointestinal diseases including hepatic disorders
  • Subjects presenting chronic degenerative and/or inflammatory diseases
  • Subjects receiving systemic treatment or topical treatment likely to interfere with evaluation of the study parameters (salicylates, antibiotics)
  • Subjects receiving corticosteroid treatment
  • Subjects using oral anticoagulants
  • Subjects with a history of soy allergy
  • Subjects who have participated in a clinical study more recently than one month before the current study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Placebo Comparator: Placebo-Control
The placebo-control group will take two placebo softgel capsules every day for 8 weeks.
Dietary supplement: Placebo-Control
two placebo softgel capsules per day (for 8 weeks) containing no vitamin K2 (menaquinone-7)
Active Comparator: Low-Dose Vitamin K2 (45-mcg/d)
The low-dose vitamin K2 group will take one 45-mcg vitamin K2 softgel capsule and one placebo softgel capsule every day for 8 weeks.
Dietary supplement: Low-Dose Vitamin K2 (menaquinone-7; 45-mcg/d)
one 45-mcg vitamin K2 (menaquinone-7) softgel capsule per day and one placebo softgel per day (containing no menaquinone-7) for 8 weeks
Other Names:
  • menaquinone-7
Active Comparator: High-Dose Vitamin K2 (90-mcg/d)
The high-dose vitamin K2 group will take two 45-mcg vitamin K2 softgel capsules every day for 8 weeks.
Dietary supplement: High-Dose Vitamin K2 (menaquinone-7; 90 mcg/d)
two 45-mcg vitamin K2 (menaquinone-7) softgel capsules per day for 8 weeks
Other Names:
  • menaquinone-7

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in serum lipid concentrations
Time Frame: 8 weeks
To determine if the vitamin K-induced change in matrix Gla protein carboxylation improves fasting lipid panel (triglycerides, total cholesterol, HDL-cholesterol, and LDL-cholesterol) in a dose-dependent manner.
8 weeks
Change in insulin sensitivity
Time Frame: 8 weeks
To determine if the vitamin K-induced change in osteocalcin carboxylation effects insulin sensitivity in a dose-dependent manner. Insulin sensitivity will be calculated from plasma insulin and glucose concentrations measured during a two-hour oral glucose tolerance test by using the oral glucose minimal model.
8 weeks
Change in beta-cell function
Time Frame: 8-weeks
To determine if the vitamin K-induced change in osteocalcin carboxylation effects beta-cell function in a dose-dependent manner. Beta-cell function, as assessed by dynamic beta-cell responsitivity, will be calculated from plasma glucose and C-peptide concentrations measured during a two-hour oral glucose tolerance test by using the oral C-peptide minimal model.
8-weeks

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change in coagulation
Time Frame: 8 weeks
Coagulation-related parameters (i.e., prothrombin time and activated partial thromboplastin time) will be assessed at baseline and 8 weeks to assess clotting function.
8 weeks
Change in arterial stiffness (pulse wave velocity)
Time Frame: 8 weeks
Arterial stiffness, as measured by pulse wave velocity (PWV), will be assessed at baseline and 8 weeks to explore whether change in arterial stiffness is influenced by vitamin K2 supplementation.
8 weeks
Change in endothelial function (flow-mediated dilation)
Time Frame: 8 weeks
Endothelial function, as measured by flow-mediated dilation (FMD), will be assessed at baseline and 8 weeks to explore whether change in endothelial function is influenced by vitamin K2 supplementation.
8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Augusta University

Investigators

  • Principal Investigator: Norman K Pollock, PhD, Department of Pediatrics, Medical College of Georgia, Augusta University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

October 1, 2016

Primary Completion (Anticipated)

December 1, 2020

Study Completion (Anticipated)

December 30, 2020

Study Registration Dates

First Submitted

October 11, 2016

First Submitted That Met QC Criteria

November 7, 2016

First Posted (Estimate)

November 9, 2016

Study Record Updates

Last Update Posted (Actual)

November 20, 2019

Last Update Submitted That Met QC Criteria

November 18, 2019

Last Verified

November 1, 2019

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 931430
  • 16GRNT31090037 (Other Grant/Funding Number: American Heart Association)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Yes

IPD Plan Description

  1. Approximate date of when the data will be shared? 2019-06-28
  2. Where will the data be made available? The de-identified data will be made available for research purposes only by contacting the principal investigator.
  3. Please explain any limits to data sharing that might be required. Even though the final research data will be stripped of identifiers prior to release for sharing, the investigators believe that there remains the possibility of deductive disclosure of subjects with unusual characteristics. Thus, the investigators will make the data available to users only under a data-sharing agreement that provides for: (1) a commitment to using the data only for research purposes and not to identify any individual participant; (2) a commitment to securing the data using appropriate computer technology; and (3) a commitment to destroying or returning the data after analyses are completed.

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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