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Hippocampal astrocytic GAT-3 blockade impairs protein synthesis and spatial memory dynamics
Juan G Riboldi1,2,3, Josefina Iribarne1,2,3, Matias M Renfijes2,4
1Departamento de Fisiología, Biología Molecular y Celular "Dr. Héctor Maldonado" (FBMC), Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina.
Communications Biology
|May 5, 2026
Summary
Astrocytic GABA transporter GAT-3 is crucial for spatial memory consolidation and expression. Its inhibition impairs memory by reducing protein synthesis, highlighting its role in cognitive function.
Area of Science:
- Neuroscience
- Cell Biology
- Cognitive Science
Background:
- Astrocytes play a key role in synaptic function and plasticity.
- GABA transporter GAT-3, located in astrocytes, regulates GABAergic signaling and synaptic homeostasis.
Purpose of the Study:
- To investigate the role of hippocampal GAT-3 in spatial memory dynamics.
- To explore the mechanisms underlying GAT-3's influence on memory consolidation and expression.
Main Methods:
- Spatial object recognition task in female Wistar rats.
- Pharmacological inhibition of GAT-3 using SNAP-5114.
- Assessment of memory consolidation, acquisition, and expression.
- Inhibition of protein synthesis (emetine) and proteasome (β-Lactacystin).
- Puromycin incorporation assays to measure protein synthesis.
Main Results:
- GAT-3 inhibition impaired memory consolidation and expression but not acquisition.
- Memory deficits were rescued by open field exposure or proteasome inhibition.
- GAT-3 inhibition reduced hippocampal protein synthesis.
- GAT-3 did not affect memory reconsolidation.
Conclusions:
- Astrocytic GAT-3 is essential for spatial memory consolidation and expression, acting via protein synthesis.
- GAT-3 modulation impacts cognitive function and may be relevant to neurological disorders.
- GAT-3's role is specific to consolidation and expression, not reconsolidation.
