Prelimbic Cortical Stimulation Improves Spatial Memory Through Distinct Patterns of Hippocampal Gene Expression in...

Area of Science:

• Neuroscience
• Gerontology
• Pharmacology

Background:

• Dementia presents significant global health challenges, with existing treatments limited by efficacy and toxicity.
• Deep brain stimulation (DBS) shows promise as a non-pharmacological dementia therapy, but research often uses models not relevant to the disease's natural progression.
• Aged animal models are crucial for understanding dementia's aetiology and testing interventions.

Purpose of the Study:

• To evaluate the impact of prelimbic cortex (PrL) DBS on memory in an aged rat model exhibiting natural cognitive decline.
• To elucidate the molecular and neurochemical mechanisms underlying PrL DBS-induced memory improvements.
• To explore non-neurogenesis related pathways involved in DBS effects on cognition.

Main Methods:

• Utilized an aged rat model to simulate natural cognitive aging.
• Employed the Morris water maze (MWM) to assess memory performance after PrL DBS.
• Conducted microarray, quantitative PCR, and mass spectrometry to analyze gene expression and neurotransmitter changes in the hippocampus.

Main Results:

• PrL DBS significantly enhanced memory performance in the MWM test in aged rats.
• Distinct gene expression patterns, particularly involving G protein-coupled receptor pathways, were observed post-DBS.
• Significant neurotransmitter alterations were detected in the dorsal hippocampus, supporting microarray findings.

Conclusions:

• PrL DBS is an effective intervention for improving memory in aged rats.
• The therapeutic effects of DBS on memory appear to involve non-neurogenesis pathways, including G protein-coupled receptor signaling.
• Further research should investigate these identified pathways to optimize DBS strategies for dementia treatment.