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NCT Number: NCT05654818

Peripheral Immunological Effects of High-dose Vitamin D Treatment in Healthy Subjects

Vitamin D deficiency is associated with the risk of developing MS. Vitamin D treatment has therefore been tested as a background treatment for this pathology, with a seemingly modest clinical effect. Indeed, the first therapeutic trials using high doses of vitamin D (SOLAR and CHOLINE) did not show a significant effect on short-term relapses. However, these two studies showed a significant decrease in the radiological activity of MS on MRI, suggesting a significant immunomodulatory efficacy but a weak clinical benefit in the short term.

Vitamin D has a pleiotropic effect on the immune system inducing overall immunomodulation through transcriptomic modulations, under the control of many individual genetic factors. However, in vivo, only one therapeutic trial has compared the immunological effect of Vitamin D in healthy subjects and in patients with a first demyelinating episode. Analysis of PBMC by flow cytometric cell sorting based on a very small number of markers (CD3, CD8, IL-17, IFN-g) did not find any significant quantitative modulation of Th17 or of their production of IL-10, IL-17 and IFN-g after treatment with Vitamin D measured by ELISA. However, the evolution of anti-inflammatory lymphocyte populations has not been evaluated. A few in vitro studies suggest that the effect of vitamin D may be incomplete on the lymphocytes of MS patients.

The study investigators will use an immunological FACS approach to describe activation markers and measure the intensity of changes induced in healthy subjects after 3 months of high-dose cholecalciferol versus placebo treatment using the same protocol as the D-Lay MS (NCT01817166) study.

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Key information

Conditions

Vitamin D Deficiency Autoimmune Diseases Autoimmune Diseases of the Nervous System Avitaminosis Deficiency Diseases Demyelinating Autoimmune Diseases, CNS Demyelinating Diseases Immune System Diseases Malnutrition Multiple Sclerosis Nervous System Diseases Nutrition Disorders Nutritional and Metabolic Diseases

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

CHU de Nîmes

Nîmes, France

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • The patient must have given their free and informed consent and signed the consent form
  • The patient must be a member or beneficiary of a health insurance plan
  • Women of childbearing potential must have effective contraception during the study period. Effective contraception is defined by a low failure rate (less than 1% per year) when used correctly and consistently, such as implants, injectables, oral contraceptives, IUDs, abstinence, or partner vasectomy. A urine pregnancy test will be performed at inclusion.

Exclusion criteria

  • The subject is participating in another therapeutic study, or is in a period of exclusion determined by a previous study
  • The subject is unable to express their consent
  • It is impossible to give the subject informed information
  • The patient is under safeguard of justice or state guardianship
  • Pregnant or breastfeeding
  • Infectious disease or vaccination within previous 3 months
  • Chronic psychiatric disease, or disease that, in the opinion of the investigator ,may put the patient at risk or affect compliance.
  • Chronic inflammatory or dysimmune disease or subject on immunomodulatory or immunosuppressive therapy (including corticosteroids) within the last 3 months.
  • Uncontrolled epilepsy.
  • Known vitamin D deficiency secondary to active or other digestive disease (celiac disease, IBD, gastrectomy or bypass, cirrhosis, short bowel syndrome, nephrotic syndrome, hyperthyroidism, hypoparathyroidism, cancer, granulomatous pathology, lymphoma, rickettsiosis).
  • History of hypercalcemia, osteopenia or osteoporosis, urinary lithiasis, heart rhythm disorders.
  • Pathology requiring a daily intake of more than 1 gram of Calcium.
  • Contraindication to vitamin D3 treatment as mentioned on the VIDAL documentation of UVEDOSE.
  • Treatment affecting vitamin D metabolism other than corticosteroids: anti-epileptic drugs [phenobarbital, primidone, phenytoin], rifampicin, isoniazid, ketoconazole, 5-FU and leucovorin, thiazide diuretic.
  • Active vitamin supplementation or dietary supplements rich in vitamin D.
  • Present or past neurological symptoms that may suggest an undiagnosed inflammatory neurological pathology.

Treatment and study plan

Vitamin D

Drug

100,000 UI

Placebo

Drug

The placebo is identical in appearance to the active treatment: a drinkable solution in ampoules that is clear, yellowish in color with a slightly lemony odor and an oily, slightly sweet, lemony taste.

Primary outcomes

  1. Change in Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD3+/CD4+

  2. Change in T helper1 (Th1) Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3+ /CCR6-

  3. Change in Th1*Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3+/CCR+

  4. Change in naive Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/CCR7+

  5. Change in effector memory Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/CCR7-

  6. Change in central memory Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/CCR7+

  7. Change in Teffector memory RA+ Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/CCR7-

  8. Change in FOXP3 Treg / Treg Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD25+/CD127+/FOXP3+

  9. Change in naive Treg Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/FOXP3+

  10. Change in memory Treg Lymphocyte T CD4+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/FOXP3+

  11. Change in Tr1 Lymphocyte T cells CD4+ since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD49b+/LAG3+

  12. Change in Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD3+/CD4-

  13. Change in naive Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/CCR7+

  14. Change in effector memory Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/CCR7-

  15. Change in central memory Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/CCR7+

  16. Change in Teffector memory RA+ Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/CCR7-

  17. Change in Tc1 Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3+/CCR6-

  18. Change in Tc1* Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3+/CCR6+

  19. Change in Tc2 Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3-/CCR6-

  20. Change in Tc17 Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CXCR3-/CCR6+

  21. Change in CD8 Tcreg / TcReg Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD25+/CD127+/FOXP3+

  22. Change in naive Tcreg Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA+/FOXP3+

  23. Change in memory Tcreg Lymphocyte T CD8+ cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD45RA-/FOXP3+

  24. Change in Lymphocyte B cells since baseline

    Time frame: Month 3

    Percentage variation measured by Fluorescence Activated Cell Sorting of cells CD19+

Secondary outcomes

  1. lymphocyte subpopulations change in CD6 phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  2. lymphocyte subpopulations change in CD162 phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  3. lymphocyte subpopulations change in CD226 phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  4. lymphocyte subpopulations change in CD46 phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  5. lymphocyte subpopulations change in CD11a phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  6. lymphocyte subpopulations change in CD49d phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  7. lymphocyte subpopulations change in CLA phenotype after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  8. Change in production of cytokine IL-10 in lymphocyte subpopulations after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  9. Change in production of cytokine IFNg in lymphocyte subpopulations after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  10. Change in production of cytokine IL-17 in lymphocyte subpopulations after 3 months of high dose vitamin D treatment or placebo

    Time frame: Month 3

    Measured by Fluorescence Activated Cell Sorting of cells

  11. Change in plasma Vitamin D levels 3 months after baseline of high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Determination of 25-OH-D2 and 25-OH-D3 forms in nmol/L in plasma with the "vitamin D total II" kit

  12. Change in 16sRNA levels 3 months after baseline of high dose Vitamin D treatment versus placebo

    Time frame: Month 3

  13. Nature of gut microbiota taxonomy 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Number of operational taxonomic units

  14. Nature of blood microbiota taxonomy 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Number of operational taxonomic units

  15. Percentage of gut microbiota taxonomy 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Percentage of operational taxonomic units

  16. Percentage of blood microbiota taxonomy 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Percentage of operational taxonomic units

  17. Diversity of gut microbiota 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Shannon index

  18. Diversity of blood microbiota 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Shannon index

  19. Beta diversity of gut microbiota 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Bray-Curtis index

  20. Beta diversity of blood microbiota 3 months after high dose Vitamin D treatment versus placebo

    Time frame: Month 3

    Bray-Curtis index

  21. Describing the genetic determinants of vitamin D response using a Single Nucleotide Polymorphism (SNP) database

    Time frame: Month 3

    Description of individual SNPs

Sponsors and collaborators

Lead sponsor

Centre Hospitalier Universitaire de Nīmes

Other

Registry information

Official study title

Peripheral Immunological Effects of High-dose Vitamin D Treatment in Healthy Subjects: Randomized, Single-center, Double-blind Trial

Acronym: VDSS

Important dates

Study start
2023
Primary completion
2023
Study completion
2023
First posted
Dec 16, 2022
Registry last updated
Dec 10, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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