Related Experiment Video
Updated: Aug 1, 2026
09:09
Elevated Plus Maze for Mice
Published on: December 22, 2008
GIRK2 deficient mice. Evidence for hyperactivity and reduced anxiety
Y A Blednov1, M Stoffel, S R Chang
1Waggoner Center for Alcohol and Addiction Research, University of Texas, A4800, 2500 Speedway, MBB 1.124, Austin, TX 78712-1095, USA. yablednov@mail.utexas.edu
Physiology & Behavior
|September 21, 2001
Summary
G-protein activated inwardly rectifying potassium channel 2 (GIRK2) deficient mice exhibit reduced anxiety and hyperactivity. Social isolation further decreased anxiety in these mice, suggesting a link to dopamine D3 receptors.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Pharmacology
Background:
- G-protein activated inwardly rectifying potassium channels (GIRK2) play a role in neuronal excitability.
- Dysfunction in GIRK2 channels has been implicated in various neurological disorders.
Purpose of the Study:
- To investigate the role of GIRK2 in anxiety-related behaviors using knockout mouse models.
- To explore the impact of social isolation on the behavior of GIRK2-deficient mice.
Main Methods:
- Utilized three established anxiety tests: elevated plus-maze, light/dark box, and "canopy" test.
- Examined GIRK2 null mutant (GIRK2-/-) and heterozygous (GIRK2+/-) mice compared to wild-type littermates.
- Assessed behavioral responses before and after a short period of social isolation.
Main Results:
- GIRK2 null mutant mice displayed reduced anxiety across all tests, evidenced by increased exploration of open/exposed areas and reduced anxiety-related postures.
- GIRK2 null mutant mice exhibited hyperactivity, particularly increased locomotion and entries into open arms.
- Social isolation decreased anxiety and increased activity in GIRK2 null mutant mice, with minimal impact on wild-type animals.
Conclusions:
- GIRK2 deficiency leads to a phenotype of reduced anxiety and hyperactivity in mice.
- The observed behavioral changes suggest a potential role for GIRK2 in modulating anxiety and dopamine D3 receptor function.
