A Novel Combination of Docosahexaenoic Acid, All-Trans Retinoic Acid, and 1, 25-Dihydroxyvitamin D3 Reduces T-Bet Gene Expression, Serum Interferon Gamma, and Clinical Scores but Promotes PPARγ Gene Expression in Experimental Autoimmune Encephalomyelitis

Vitamins are immunologically interesting due to their significant immunomodulatory activities. Experimental autoimmune encephalomyelitis (EAE) is one of the most commonly used experimental models for studying autoimmune disorder in multiple sclerosis (MS). The aim of this study was to evaluate the protective and ameliorative effects of novel combination of all-trans retinoic acid (ATRA), 1,25-dihydroxyvitamin D 3 (D 3 ), and docosahexaenoic acid (DHA) on EAE-specific determinants and target gene expressions. Mice were randomly categorized into three groups before EAE induction [non-treated EAE (Group E), treated EAE (Group T), and healthy mice (Group H)]. Encephalomyelitis was induced in female C57BL/6 mice by subcutaneous immunization using commercial kits. Preceding day of EAE induction, combination of ATRA, D 3 , and DHA was administered with a single IP injection every 48 h and continued until day 26. Findings of present study showed that administration of vitamins A, D, and DHA significantly decreased average clinical scores, cumulative EAE score, and EAE incidence in Group T, compared to Group E ( p values