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Galanin overexpressing transgenic mice
Jacqueline N Crawley1, Elliott J Mufson, John G Hohmann
1Section on Behavioral Genomics, National Institute of Mental Health, Bethesda, MD 20815, USA. crawleyj@intra.nimh.nih.gov
Neuropeptides
|October 3, 2002
Summary
Galanin overexpressing mice show reduced seizure sensitivity but impaired learning and memory. These transgenic mice offer a new model for studying galanin
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- Galanin is a neuropeptide implicated in various physiological processes.
- Understanding galanin's role in the brain is crucial for neurological research.
Purpose of the Study:
- To create and characterize galanin overexpressing transgenic mice (GAL-tg).
- To investigate the effects of elevated galanin levels on hippocampal function, learning, memory, and seizure susceptibility.
Main Methods:
- Generation of two distinct lines of GAL-tg mice using different promoters.
- Comparison of GAL-tg mice with wildtype (WT) littermate controls.
- Assessment of seizure sensitivity, learning and memory performance, long-term potentiation (LTP), hippocampal excitability, glutamate release, and neuronal counts.
Main Results:
- Both GAL-tg lines exhibited high hippocampal galanin levels and reduced seizure sensitivity compared to WT.
- GAL-tg mice displayed deficits in learning and memory tasks.
- Impaired LTP, reduced hippocampal excitability, and decreased evoked glutamate release were observed in GAL-tg.
- A reduction in choline acetyltransferase-immunoreactive neurons was noted in GAL-tg mice.
- Altered sensitivity to nociceptive stimuli was observed in one GAL-tg line.
Conclusions:
- GAL-tg mice serve as a valuable model for exploring endogenous galanin's biological functions.
- These mice provide a platform for evaluating novel therapeutics targeting galanin receptor ligands.