Multiple sclerosis (MS) is a consequence of genetic and environmental
factors. Geographic, genetic, and biological evidence suggests that an
important immunopathogenic factor might be the insufficiency of vitamin D.
The aim of our study was to investigate the immunomodulatory effect of
alfacalcidol, a vitamin D analogue, on cytokine levels in RRMS patients in
relapse. We investigated 15 patients suffering from RRMS relapse (an RRMS
group) and two control groups: one control group of healthy subjects (n=10)
and a NIND group, consisting of patients with non-inflammatory neurological
diseases (n=10). All of the MS patients were treated with 5 ?gr/day of oral
alfacalcidol for a period of five days. The serum cytokine levels of TNF-?,
IL-10, IL-4, and IL-12 were measured in all the MS patients one day prior to
and one day after therapy, and in all the control subjects (ELISA, Quantikine
human immunoassay, R&D Systems, UK). Our results showed significantly lower
IL- 4 and IL- 12 levels in the RRMS patients group compared to the N group
and the NIND group (p<0.001 Mann-Whitney U-test). No significant differences
in TNF-? and IL-10 levels were found between the groups, and there was no
influence of alfacalcidol on these cytokines in RRMS patients. High doses of
oral alfacalcidol induced significant increases in IL-4 and IL-12 levels in
RRMS patients (p<0.001, Wilcoxon rank signed test). Therefore, there were no
differences in IL- 4 and IL- 12 levels compared to the N group and the NIND
group. Alfacalcidol therapy in RRMS patients did not provoke any side
effects. Vitamin D and its analogues, such as alfacalcidol, act as
immunomodulatory agents, with potential therapeutic effects for patients with
multiple sclerosis.