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Ergocalciferol Therapy in Calcidiol Deficient, Hemodialysis Patients on Therapeutic Doses of Paricalcitol

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02011828
Recruitment Status : Completed
First Posted : December 13, 2013
Last Update Posted : August 11, 2016
Information provided by (Responsible Party):
Srinvasan Beddhu, University of Utah

Brief Summary:

The objective of this study is to determine the effects of cholecalciferol treatment on inflammation and insulin resistance, in patients on hemodialysis that are previously treated with paricalcitol.

Cholecalciferol is produced by the action of sunlight on a cholesterol precursor in the skin. This compound is then converted to calcidiol (25(OH) D3) in the liver, whereupon calcidiol is converted in the kidney to calcitriol (1,25(OH)2D3), the active form of vitamin D. However, recently it has been shown that deficiency of either calcidiol or calcitriol is associated with inflammation, insulin resistance and increased mortality in the general population. Furthermore, when both calcidiol and calcitriol were deficient, the mortality risk was much higher than the deficiency of either alone. A possible explanation is that some of the non-renal tissues might critically depend on the endogenous conversion of calcidiol to calcitriol and not on circulating levels of calcitriol. Thus, low circulating levels of calcidiol might be associated with tissue level functional calcitriol deficiency despite adequate circulating levels of calcitriol.

Therefore, the hypothesis is that:

  1. In non-diabetic hemodialysis (HD) patients treated with therapeutic doses of paricalcitol (an analog of calcitriol), calcidiol deficiency is associated with inflammation and insulin resistance and
  2. In calcidiol deficient, non-diabetic HD patients with inflammation and treated with therapeutic doses of paricalcitol, cholecalciferol will reverse the calcidiol deficiency and thereby, reduce inflammation and insulin resistance.

Interleulin-6 (IL-6) is thought to play a central role in insulin resistance by down-regulating glucose transporter-4 messenger RNA. Furthermore, IL-6 levels are significantly negatively associated with calcidiol levels, therefore will be measured as the primary outcome.

Condition or disease Intervention/treatment Phase
Inflammation Insulin Resistance Drug: Ergocalciferol Drug: Placebo Phase 1

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 58 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Ergocalciferol Therapy in Calcidiol Deficient, Hemodialysis Patients on Therapeutic Doses of Paricalcitol
Study Start Date : May 2009
Actual Primary Completion Date : January 2011
Actual Study Completion Date : January 2011

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Dialysis

Arm Intervention/treatment
Experimental: Ergocalciferol, then Placebo
Participants first receive Ergocalciferol 50,000 international units (IU)/week for the first 12 weeks. After a 4 week wash-out period, they then receive matching placebo treatment for 12 weeks.
Drug: Ergocalciferol
50,000 IU/week

Drug: Placebo
Placebo tablet

Experimental: Placebo, then Ergocalciferol
Participants first receive placebo treatment (matching ergocalciferol 50,000 IU/week) for the first 12 weeks. After a 4 week wash-out period, they then receive ergocalciferol 50,000 IU/week treatment for 12 weeks.
Drug: Ergocalciferol
50,000 IU/week

Drug: Placebo
Placebo tablet

Primary Outcome Measures :
  1. Plasma concentration of Interleukin-6 (IL-6) [ Time Frame: 28 weeks ]
    Comparison of IL-6 levels after treatment with ergocalciferol and after treatment with placebo

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Non-diabetic in-center HD patients on stable doses of paricalcitol over past three months with intact parathyroid hormone (iPTH) in the therapeutic range (150-300 pg/ml) will be identified from review of the dialysis program electronic medical records. Woman in the reproductive age group (ages 18-55), excluding those women who have undergone hysterectomy, oopherectomy will undergo a serum β-HCG levels during the selection process. If β-HCG levels are positive these patients will be excluded from the study.

Inclusion criteria:

  • Non diabetic patients on HD, on stable dose of paricalcitol supplements for at least 3 months with iPTH in target range. Of the 60 patients enrolled in the observational component, those with high CRP (> 3 mg/dl) and calcidiol deficiency (< 15 ng/ml) will be eligible to participate in the interventional study.
  • As the median CRP in the HEMO Study was 11 mg/L and > 80% of HD patients are calcidiol deficient [10], most of the screened patients will be eligible. In each year, the first 12 patients who meet the above criteria and consent for the interventional component, a randomized cross-over trial of cholecalciferol 50,000 IU/ week vs. matching placebo will be conducted.

Exclusion criteria:

  • Diabetic patients, not on paricalcitol, enrolled in other interventional studies, hospitalized in the past month or treated for an infection in the past month and pregnancy.
  • We will conduct a pregnancy test for women in the reproductive age group (18-55 years) during the initial screening process. We will obtain serum β-HCG levels to rule out pregnancy and the test will be paid for by the study. The results will be reviewed by the PI. If β-HCG levels are positive these patients will be withdrawn from the study.

Information from the National Library of Medicine

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 identifier (NCT number): NCT02011828

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United States, Utah
University of Utah
Salt Lake City, Utah, United States, 84112
Sponsors and Collaborators
University of Utah
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Principal Investigator: Srinivasan Beddhu, MD University of Utah
Principal Investigator: Vidya Raj Krishnamurthy, MD University of Utah
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Responsible Party: Srinvasan Beddhu, MD, Associate Professor of Medicine, University of Utah Identifier: NCT02011828    
Other Study ID Numbers: IRB_00032685
First Posted: December 13, 2013    Key Record Dates
Last Update Posted: August 11, 2016
Last Verified: August 2016
Keywords provided by Srinvasan Beddhu, University of Utah:
Hemodialysis, paricalcitol
Additional relevant MeSH terms:
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Insulin Resistance
Pathologic Processes
Glucose Metabolism Disorders
Metabolic Diseases
Vitamin D
Calcium-Regulating Hormones and Agents
Physiological Effects of Drugs
Growth Substances
Bone Density Conservation Agents