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Behavioural phenotypes of hypomorphic KCC2-deficient mice
Janne Tornberg1, Vootele Voikar, Harri Savilahti
1Neuroscience Center, PO Box 56, Viikinkaari 4, FIN-00014 University of Helsinki, Finland.
The European Journal of Neuroscience
|April 9, 2005
Summary
Reduced KCC2 transporter levels in adult mice impair learning, increase anxiety, and lower seizure thresholds. These findings highlight KCC2
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Fast inhibitory neurotransmission, crucial for brain function, relies on chloride extrusion via the KCC2 transporter.
- The role of KCC2 in the adult central nervous system (CNS) at a systems level remains largely unexplored.
Purpose of the Study:
- To investigate the behavioral and functional consequences of reduced KCC2 protein levels in adult mice.
- To elucidate the specific roles of KCC2-dependent hyperpolarizing inhibition in various CNS systems.
Main Methods:
- Generation and characterization of doubly heterozygous KCC2-deficient mice retaining 15-20% of normal KCC2 levels.
- Assessment of various behavioral phenotypes including anxiety, seizure susceptibility, learning, sensory perception, locomotion, and motor coordination.
Main Results:
- KCC2-deficient mice exhibited reduced body weight, increased anxiety-like behaviors, and heightened susceptibility to seizures.
- Impaired performance in water maze learning and reduced sensitivity to tactile and thermal stimuli were observed.
- Normal spontaneous locomotor activity and motor coordination were maintained, suggesting system-specific KCC2 requirements.
Conclusions:
- KCC2-dependent fast hyperpolarizing inhibition plays distinct roles across different CNS functional systems.
- These KCC2-deficient mice serve as a valuable model for studying the specific functions of hyperpolarizing inhibition.
- Findings have implications for understanding and treating neuropsychiatric disorders like epilepsy, pain, and anxiety.