The Prevalence of Vitamin D Deficiency and Effects of Vitamin D Supplementation in HIV-1 Infected Patients
Recruitment status was Recruiting
|First Received Date ICMJE||March 22, 2006|
|Last Updated Date||February 28, 2007|
|Start Date ICMJE||January 2006|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||normalization of vitamin D levels at 12 weeks|
|Original Primary Outcome Measures ICMJE||Same as current|
|Change History||Complete list of historical versions of study NCT00306410 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE||Not Provided|
|Original Secondary Outcome Measures ICMJE||Not Provided|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||The Prevalence of Vitamin D Deficiency and Effects of Vitamin D Supplementation in HIV-1 Infected Patients|
|Official Title ICMJE||The Prevalence of Vitamin D Deficiency and Effects of Vitamin D Supplementation in HIV-1 Infected Patients|
The purpose of this study is to determine the effect of normalization of vitamin D levels on bone density, immune and adipocyte function in HIV1-seropositive patients.
Vitamin D deficiency is common in, especially black, HIV-seropositive patients. Vitamin D deficiency can be caused by lack of sunlight and/or insufficient vitamin D intake via diet. The HIV infection itself and antiretroviral therapy (ART) may also cause vitamin D deficiency. ART interferes with cytochrome p450 activity and as such might affect vitamin D metabolism.
Vitamin D has several important physiological functions such as 1. regulation of calcium and phosphate homeostasis, 2. immunomodulatory properties and 3. effects on adipocyte differentiation. Low vitamin D levels lead to decreased bone mineralization, eventually resulting in rachitis(children) or osteomalacia (in adults). In addition vitamin D deficiency leads to secondary hyperparathyroidism, which leads to even more bone matrix demineralization. In HIV infected persons the overall prevalence of osteopenia and osteoporoses is 14-84% and 0-45% respectively. Vitamin D has been suggested to play a role in HIV-associated bone disorders. The vitamin D status also affects the host defence in HIV patients; a significantly lower CD4 cell count has been found in patients with 1,25(OH)vitamin D deficiency. Furthermore, the influence of vitamin D on adipocyte differentiation and the effect of HAART on vitamin D levels might be relevant for changes in fat distribution and the development of insulin resistance as is seen days after initiation of HAART.
Vitamin D is metabolized in the body trough cytochrome P450 enzymes. HAART might interact with vitamin D metabolism on basis of CYP3A4, which plays an important role in clearance of most antiretroviral agents and also showed to be a vitamin D 24 and 25-hydroxylase in vitro. We hypothesize that PI’s lead to lower 1a,25(OH)2D3 by suppressing 1a- and 25-hydroxylase activity.
The results of our pilot showed that 25(OH)D deficiency is common among HIV patients. Seen the diversity of functions of vitamin D, we hypothesize that it’s beneficial for the patients to have a normal vitamin D status. Therefore, supplementation of vitamin D is warranted.
In this study we want to investigate if, despite the complex interaction between HAART/ HIV and vitamin D metabolism, supplementation of colecalciferol (2000 IU daily) will lead to normalization of the vitamin D levels. Furthermore, we want to study the effects of normalization of vitamin D levels on bone mineral density, immune and adipocyte function. Therefore we will do a prospective, randomized, double-blind, placebo-controlled vitamin D intervention study in vitamin D deficient HIV1-seropositive patients.
|Study Type ICMJE||Interventional|
|Study Phase||Phase 2|
|Study Design ICMJE||Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
|Intervention ICMJE||Drug: colecalciferol|
|Study Arm (s)||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Recruiting|
|Completion Date||July 2007|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
|Ages||18 Years and older|
|Accepts Healthy Volunteers||No|
|Listed Location Countries ICMJE||Netherlands|
|Removed Location Countries|
|NCT Number ICMJE||NCT00306410|
|Other Study ID Numbers ICMJE||VIDI trial|
|Has Data Monitoring Committee||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor ICMJE||Radboud University|
|Collaborators ICMJE||Not Provided|
|Information Provided By||Radboud University|
|Verification Date||February 2007|
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