Dysregulation of methionine metabolism in multiple sclerosis

Area of Science:

• Neuroscience
• Metabolic disorders
• Epigenetics

Background:

• Multiple sclerosis (MS) is a chronic autoimmune disease affecting the central nervous system.
• Aberrant epigenetic modifications are implicated in MS pathogenesis.
• Methionine metabolism plays a crucial role in cellular methylation processes.

Purpose of the Study:

• To investigate plasma methionine concentrations in patients with relapse-remitting multiple sclerosis (RRMS).
• To explore the in vivo relationship between peripheral methionine levels and central epigenetic modifications.
• To determine if reduced methionine is an early indicator of metabolic dysregulation in MS.

Main Methods:

• Quantification of plasma methionine levels in RRMS patients and healthy controls.
• In vivo studies in mice to assess the impact of peripheral methionine on histone H3 and DNA methyltransferase 3A (DNMT3A) expression in the cerebral cortex.

Main Results:

• A significant reduction in plasma methionine was observed in RRMS patients compared to controls.
• Peripheral methionine level changes in mice correlated with alterations in histone H3 methylation and DNMT3A expression in the brain.
• These findings indicate a potential link between peripheral methionine levels and central epigenetic regulation.

Conclusions:

• Decreased circulating methionine may be an early sign of metabolic dysfunction in MS.
• Reduced methionine could influence epigenetic modifications, specifically histone H3 and DNA methylation, within the central nervous system.
• This study highlights a novel pathway involving methionine metabolism and epigenetics in MS pathophysiology.