Related Experiment Video
Updated: May 2, 2026
07:42
Combined Transcranial Magnetic Stimulation and Electroencephalography of the Dorsolateral Prefrontal Cortex
Published on: August 17, 2018
15.6K
Prefrontal cortical GABAergic dysfunction contributes to age-related working memory impairment.
Cristina Bañuelos1, B Sofia Beas, Joseph A McQuail
1Department of Neuroscience, Department of Psychiatry, McKnight Brain Institute, and Department of Pharmacodynamics, University of Florida, Gainesville, Florida 32610.
Summary
Aging impairs working memory by altering GABAergic signaling in the prefrontal cortex. Blocking GABA(B) receptors (GABA(B)Rs) with CGP55845 improved working memory in aged rats, suggesting a therapeutic target.
Area of Science:
- Neuroscience
- Aging Research
- Cognitive Neuroscience
Background:
- Working memory, crucial for executive functions, declines with age.
- Prefrontal cortex (PFC) GABAergic circuits are vital for working memory, but aging's impact is unclear.
- Understanding age-related changes in PFC GABAergic signaling is key to addressing cognitive deficits.
Purpose of the Study:
- To investigate how aging affects GABAergic synaptic protein expression in the rat medial PFC (mPFC).
- To determine the relationship between these protein changes and working memory performance in aged rats.
- To test if modulating PFC GABAergic signaling can rescue age-related working memory decline.
Main Methods:
- Assessed expression of GABA synthesizing (GAD67) and transporting (VGAT, GAT-1) proteins, and GABA(B) receptors (GABA(B)R) in aged vs. young rat mPFC.
- Correlated protein expression levels with working memory performance using behavioral tasks.
- Administered GABA(B)R antagonist CGP55845 systemically and intra-mPFC to evaluate effects on working memory in aged rats.
Main Results:
- Aged rats showed increased GAD67, decreased GAT-1 and GABA(B)R expression in mPFC; VGAT was unchanged.
- Lower GABA(B)R expression correlated with better working memory in aged rats.
- Systemic and intra-mPFC administration of CGP55845 dose-dependently improved working memory in aged rats.
Conclusions:
- Age-related alterations in PFC GABAergic signaling, particularly reduced GABA(B)R, contribute to working memory deficits.
- Targeting GABA(B) receptors represents a potential therapeutic strategy for age-related cognitive decline and executive dysfunction.
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