Oryeongsan (Goreisan) Ameliorates Experimental Autoimmune Encephalomyelitis

Area of Science:

• Neuroscience
• Immunology
• Pharmacology

Background:

• Oryeongsan (Goreisan) is a traditional herbal formula used for fluid homeostasis disorders.
• Goreisan exhibits anti-inflammatory properties and inhibits aquaporins (AQPs).
• Experimental autoimmune encephalomyelitis (EAE) serves as a model for inflammatory demyelinating diseases.

Purpose of the Study:

• To investigate the therapeutic potential of Goreisan in a mouse model of EAE.
• To elucidate the mechanism underlying Goreisan's effects on EAE, focusing on aquaporin-4 (AQP4) expression.

Main Methods:

• EAE was induced in mice using MOG35-55 peptide immunization.
• Mice were treated with either Goreisan or a sham treatment.
• Clinical EAE scores, central nervous system (CNS) histopathology, spleen cell proliferation, cytokine levels, and AQP4 mRNA expression were analyzed.

Main Results:

• Goreisan treatment significantly reduced EAE clinical scores and CD4-positive cell infiltration in the CNS.
• Spleen cell proliferation in response to MOG35-55 peptide was not significantly different between groups.
• Goreisan treatment decreased AQP4 mRNA levels in the spinal cord of EAE mice.

Conclusions:

• Goreisan ameliorates EAE by inhibiting pathogenic cell migration into the CNS.
• Suppression of aquaporin-4 (AQP4) expression in the CNS is a key mechanism of Goreisan's therapeutic effect.
• Goreisan demonstrates potential as a treatment for inflammatory demyelinating diseases.