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Updated: Aug 24, 2026
Quantification of Autoreactive Antibodies in Mice upon Experimental Autoimmune Encephalomyelitis
Published on: December 1, 2023
Gene expression analysis suggests that 1,25-dihydroxyvitamin D3 reverses experimental autoimmune encephalomyelitis by
Karen M Spach1, Laura B Pedersen, Faye E Nashold
1Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Abstract:
Multiple sclerosis (MS) is a debilitating autoimmune disease of the central nervous system (CNS) that develops in genetically susceptible individuals who are exposed to undefined environmental risk factors. Epidemiological, genetic, and biological evidence suggests that insufficient vitamin D may be an MS risk factor. However, little is known about how vitamin D might be protective in MS. We hypothesized that 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3] might regulate gene expression patterns in a manner that would resolve inflammation. To test this hypothesis, experimental autoimmune encephalomyelitis (EAE) was induced in mice, 1,25-(OH)2D3 or a placebo was administered, and 6 h later, DNA microarray hybridization was performed with spinal cord RNA to analyze the gene expression patterns. At this time, clinical, histopathological, and biological studies showed that the two groups did not differ in EAE disease, but changes in several 1,25-(OH)2D3-responsive genes indicated that the 1,25-(OH)2D3 had reached the CNS. Compared with normal mice, placebo-treated mice with EAE showed increased expression of many immune system genes, confirming the acute inflammation. When 1,25-(OH)2D3 was administered, several genes like glial fibrillary acidic protein and eukaryotic initiation factor 2alpha kinase 4, whose expression increased or decreased with EAE, returned to homeostatic levels. Also, two genes with pro-apoptotic functions, calpain-2 and caspase-8-associated protein, increased significantly. A terminal deoxynucleotidyl transferase-mediated dUTP nicked end labeling study detected increased nuclear fragmentation in the 1,25-(OH)2D3-treated samples, confirming increased apoptosis. Together, these results suggest that sensitization of inflammatory cells to apoptotic signals may be one mechanism by which the 1,25-(OH)2D3 resolved EAE.
Insights
Vitamin D may protect against multiple sclerosis (MS) by regulating gene expression. Studies show 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) in mice induced apoptosis in inflammatory cells, potentially resolving MS-like disease.
Area of Science:
- Neuroimmunology
- Endocrinology
Background:
- Multiple sclerosis (MS) is an autoimmune disease of the central nervous system (CNS).
- Low vitamin D levels are a potential risk factor for MS.
- The protective mechanisms of vitamin D in MS are not well understood.
Purpose of the Study:
- To investigate if 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) regulates gene expression to resolve inflammation in experimental autoimmune encephalomyelitis (EAE), a mouse model of MS.
- To explore the molecular mechanisms underlying vitamin D's potential protective effects in MS.
Main Methods:
- Induction of EAE in mice.
- Administration of 1,25-(OH)2D3 or a placebo.
- DNA microarray analysis of spinal cord RNA to assess gene expression patterns.
- Histopathological and biological studies to evaluate disease progression and apoptosis.
Main Results:
- 1,25-(OH)2D3 administration reached the CNS, as indicated by changes in responsive genes.
- In EAE mice treated with 1,25-(OH)2D3, gene expression returned to homeostatic levels.
- Pro-apoptotic genes (calpain-2, caspase-8-associated protein) increased, and apoptosis was confirmed via TUNEL assay.
Conclusions:
- 1,25-dihydroxyvitamin D3 may resolve EAE by increasing the susceptibility of inflammatory cells to apoptosis.
- These findings suggest a potential therapeutic role for vitamin D in managing MS.
