Effects Vitamin D Suppletion on Postprandial Leukocyte Activation (DOSFEM)
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|ClinicalTrials.gov Identifier: NCT01967459|
Recruitment Status : Completed
First Posted : October 23, 2013
Last Update Posted : October 5, 2017
|Condition or disease||Intervention/treatment||Phase|
|Atherosclerosis Oxidative Stress Leukocyte Activation Disorder||Drug: Cholecalciferol||Not Applicable|
Rationale: Postprandial lipemia, known to be associated with acute leukocyte activation, impairs endothelial function and promotes atherosclerosis. Deficiency of vitamin D is associated with increased cardiovascular risk, but the precise mechanism is still unclear. A recent pilot study performed in our laboratory showed improved postprandial vascular function by pulse wave analysis and decreased postprandial leukocyte activation after vitamin D supplementation. Interestingly, the effects on leukocyte activation were solely found in females.
Hypothesis: The beneficial effects of vitamin D administration on postprandial leukocyte activation are mediated by suppression of oxidative stress. High doses of vitamin D may have a more pronounced effect than low doses.
Objective: To estimate the effect sizes of different doses of vitamin D on postprandial leukocyte activation markers, oxidative stress and arterial stiffness in vitamin D deficient females.
Study design: Randomized, double blind pilot study. Study population: Premenopausal overweight and obese female volunteers with proven vitamin D deficiency, ≥ 18 years of age.
Intervention: Two oral fat load tests (OFLTs) will be performed. After the first OFLT, volunteers will be randomly assigned to receive a single low dose (75 000 IU) or high dose (300 000 IU) of cholecalciferol drink. One week later the OFLT will be repeated.
Main study parameters/endpoints: Postprandial leukocyte activation, oxidative stress parameters and arterial augmentation index.
Nature and extent of the burden and risks associated with participation, benefit and group relatedness: The use of a single dose of 300 000 IU of cholecalciferol has been established to be a safe and effective way to correct vitamin D deficiency. Volunteers will be hospitalized on 2 different days (day 1, day 8) for approximately nine hours each day and receive an oral fat load. Cholecalciferol will be administered once. Volunteers will be instructed not to take vitamin D supplements during the study up until 3 months after the study. The volunteers' general practitioner will be informed on their participation. A total of 222ml (111ml for each postprandial test) of blood will be drawn. Volunteers will be allowed to drink only water during the tests. There is a theoretical risk of hypercalcemia but no excessive risk is involved. Volunteers receive 250 euros for full participation. Furthermore, volunteers will be told and given advice if they turn out to suffer from hyperlipidemia or any other condition.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||24 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)|
|Official Title:||Effects of High and Low Dose Vitamin D Suppletion on Postprandial Leukocyte Activation, Oxidative Stress and Vascular Function in Healthy Overweight and Obese Females|
|Study Start Date :||October 2013|
|Actual Primary Completion Date :||December 2015|
|Actual Study Completion Date :||December 2015|
Active Comparator: High dose vitamin D
Volunteers assigned to this arm will receive a single dose of oral cholecalciferol 300 000 IU, in the form of 3 ml D-cura drink 100 000 IU/ml
Single dose D-cura cholecalciferol drink 100 000 IU/ml, in total 300 000 IU (=3ml)
Other Name: D-cura
Active Comparator: Low dose vitamin D
Volunteers assigned to this arm will receive a single dose of oral cholecalciferol 75000 IU, in the form of 3 ml D-cura drink 25 000 IU/ml
Single dose D-cura cholecalciferol drink 250 000 IU/ml, in total 75 000 IU (=3ml)
Other Name: D-cura
- effect of vitamin D on leukocyte cluster of differentiation antigen 11b expression [ Time Frame: 2, 4, 6 and 8 hours postprandial ]the differential effect of 75 000 IU low dose vs. 300 000 IU high dose vitamin D on postprandial leukocyte activation markers cluster of differentiation antigen 11b
- Effect of vitamin D on oxidative stress [ Time Frame: 2,4,6 and 8 hours postprandial ]the differential effect of 75 000 IU low dose vs. 300 000 IU high dose vitamin D on oxidative stress
- Effect of vitamin D on vascular function [ Time Frame: 0,2,6,8 and 8 hours postprandial ]the differential effect of 75 000 IU low dose vs. 300 000 IU high dose vitamin D on vascular function (Pulse Wave Velocity and Augmentation Index)
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01967459
|Sint Franciscus Gasthuis|
|Rotterdam, Zuid-Holland, Netherlands, 3045 PM|
|Study Chair:||Manuel Castro Cabezas, MD, PhD||Sint Franciscus Gasthuis|