GABA-Induced Exosomes Improve Memory Impairment in Aged Mice

Area of Science:

• Neuroscience
• Gerontology
• Molecular Biology

Background:

• Gamma-aminobutyric acid (GABA) plays a role in gut-brain interactions and neuronal function.
• Age-related cognitive decline is a significant concern, impacting memory and neuronal health.
• Exosomes are emerging as key mediators of intercellular communication.

Purpose of the Study:

• To investigate the effects of oral GABA administration on age-related cognitive decline in mice.
• To explore the role of circulating exosomes in mediating GABA's cognitive benefits.
• To identify molecular mechanisms underlying GABA-induced cognitive improvement.

Main Methods:

• Aged mice received oral administration of GABA.
• Cognitive function was assessed using behavioral tests (e.g., discrimination index).
• Plasma-derived exosomes were isolated and analyzed for molecular cargo and functional effects on neuronal cells (SH-SY5Y).
• Neuroinflammation and senescence markers in the hippocampus were evaluated.

Main Results:

• Oral GABA significantly improved memory performance in aged mice.
• GABA administration enhanced exosomal expression of miRNAs associated with neuronal activation and longevity.
• Plasma-derived exosomes from GABA-treated mice promoted neurite outgrowth and mitochondrial activity in neuronal cells.
• GABA-treated mice showed reduced hippocampal neuroinflammation and decreased senescent cell markers.
• Upregulation of mitochondria- and neurite-related genes and enrichment of relevant pathways were observed.

Conclusions:

• Long-term oral GABA administration ameliorates age-related cognitive decline in mice.
• The cognitive benefits are mediated by functional exosomes that enhance neuronal activity and reduce senescence.
• GABA represents a potential therapeutic strategy for improving cognitive function in aging populations.