Matrine protects against experimental autoimmune encephalomyelitis through modulating microglial ferroptosis

Area of Science:

• Neuroscience
• Immunology
• Pharmacology

Background:

• Multiple sclerosis (MS) is a neurodegenerative disease characterized by inflammation and demyelination in the central nervous system (CNS).
• Ferroptosis, an iron-dependent cell death pathway, is implicated in brain disorders, with iron-loaded microglia observed in affected areas.
• The precise molecular links between ferroptosis and MS pathogenesis remain unclear.

Purpose of the Study:

• To investigate the impact of matrine (MAT), a herbal medicine, on oxidative stress and ferroptosis in the CNS of experimental autoimmune encephalomyelitis (EAE) mice, an MS model.
• To elucidate the role of ferroptosis and microglial activation in CNS autoimmunity and the therapeutic potential of MAT.

Main Methods:

• EAE mice were treated with MAT to assess its effects on disease severity and CNS pathology.
• Levels of ferroptosis markers (MDA, LPCAT3, PTGS2) and antioxidant molecules (GSH, SOD, GPX4, SLC7A11) were measured in the CNS.
• Microglial activation, inflammatory cytokine production (IL-6, TNF-α), and expression of ferroptosis-related enzymes (PTGS2, LOX) were analyzed.

Main Results:

• EAE mice exhibited elevated ferroptosis markers and reduced antioxidant molecules in the CNS.
• MAT treatment significantly reduced disease severity, CNS inflammatory demyelination, and reversed the ferroptosis/antioxidant imbalance.
• MAT treatment decreased the expression of PTGS2 and LOX in microglia and reduced pro-inflammatory cytokine production (IL-6, TNF-α).

Conclusions:

• Ferroptosis and inflammation are key players in the pathogenesis of CNS autoimmune diseases like MS.
• MAT demonstrates therapeutic potential by inhibiting ferroptosis-induced microglial activation and inflammation.
• Targeting ferroptosis in microglia represents a novel therapeutic strategy for MS and related CNS inflammatory demyelination disorders.