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Related Concept Videos

Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

464
The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
464

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Related Experiment Video

Updated: Aug 22, 2025

Motor and Hippocampal Dependent Spatial Learning and Reference Memory Assessment in a Transgenic Rat Model of Alzheimer's Disease with Stroke
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Spatial Memory Training Counteracts Hippocampal GIRK Channel Decrease in the Transgenic APPSw,Ind J9 Alzheimer's

Sara Temprano-Carazo1, Ana Contreras1, Carlos A Saura2,3

  • 1Neurophysiology & Behavior Lab, Centro Regional de Investigaciones Biomédicas (CRIB), School of Medicine of Ciudad Real, University of Castilla-La Mancha, 13079 Ciudad Real, Spain.

International Journal of Molecular Sciences
|November 11, 2022
PubMed
Summary
This summary is machine-generated.

G-protein-gated inwardly rectifying potassium (GIRK) channel expression, particularly GIRK2, decreases in Alzheimer

Keywords:
APPSw,Ind J9Alzheimer’s diseaseGIRKexcitatory/inhibitory imbalancehippocampusspatial memory

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • G-protein-gated inwardly rectifying potassium (GIRK) channels regulate neuronal excitability.
  • GIRK channels are potential therapeutic targets for hyperexcitability in acute amyloidosis models.
  • The role of GIRK signaling in Alzheimer's disease (AD) transgenic models remains largely unexplored.

Purpose of the Study:

  • To investigate alterations in GIRK channel expression during progressive amyloid-β (Aβ) accumulation in the hippocampus of AD mice.
  • To examine the impact of spatial memory training on GIRK subunit and RGS7 protein expression in the hippocampus of AD mice.

Main Methods:

  • Utilized mutant β-amyloid precursor protein (APPSw,Ind J9) transgenic mice models of AD.
  • Analyzed hippocampal protein expression of GIRK subunits (GIRK2, GIRK3) and RGS7.
  • Assessed the effects of spatial memory training on protein expression levels.

Main Results:

  • Reduced GIRK2 expression was observed in the hippocampus of 6-month-old APPSw,Ind J9 mice.
  • Aging affected GIRK2 and GIRK3 subunit expression in both wild-type (WT) and APPSw,Ind J9 mice.
  • Spatial memory training normalized GIRK2 expression in APPSw,Ind J9 mice to WT levels.

Conclusions:

  • GIRK2 dysfunction may contribute to excitatory/inhibitory neurotransmission imbalance in AD.
  • Cognitive training in hippocampal-dependent tasks may offer therapeutic benefits by reversing early AD-related deficits.