The NMDA Receptor Antagonist Memantine Modulates Aging and Stress Resilience

Area of Science:

• Gerontology and aging research
• Pharmacology and drug discovery
• Molecular biology and genetics

Background:

• Aging is characterized by declining physiological resilience and impaired stress responses.
• Caloric restriction (CR) and pharmacological agents are key tools for studying longevity pathways in model organisms like C. elegans.
• Understanding novel interventions that promote healthy aging is crucial.

Purpose of the Study:

• To investigate the effects of the N-methyl-D-aspartate receptor (NMDAR) antagonist memantine on lifespan and stress tolerance in C. elegans.
• To explore the molecular and metabolic mechanisms underlying memantine's action.
• To compare memantine's effects with those of ketamine and caloric restriction models.

Main Methods:

• Lifespan assays in C. elegans treated with memantine.
• Transcriptomic analysis to compare gene expression profiles.
• Functional assays measuring mitochondrial and oxidative stress, fatty acid metabolism, and behavioral responses.
• Comparison with eat-2 mutant (CR model) and ketamine-treated animals.

Main Results:

• Memantine significantly extended median and reproductive lifespan in C. elegans.
• Transcriptomic data showed overlap between memantine treatment and CR models (eat-2 mutants).
• Memantine reduced mitochondrial/oxidative stress, enhanced fatty acid β-oxidation, and altered feeding/locomotion behaviors without affecting lipid storage.

Conclusions:

• Memantine acts as a novel longevity-modulating intervention in C. elegans.
• The drug promotes stress resilience and healthy aging through metabolic alterations that mimic pathways activated by caloric restriction.
• These findings suggest memantine's potential for therapeutic applications in aging and age-related diseases.