Abstract
Chronic treatment with the tricyclic antidepressants imipramine (15 mg/kg) and desmethylimipramine (5 mg/kg) significantly reduced the exaggerated immobility normally exhibited by the Flinders Sensitive Line (FSL) rats in the Forced Swim Test. The control group, Flinders Resistant Line (FRL) rats were only slightly affected. In contrast, chronic treatment with the anticholinesterase diisopropyl fluorophosphate at doses known to down regulate muscarinic receptors did not alter swim test immobility in either FSL or FRL rats. Our findings support the validity of the FSL rats as an animal model of depression and suggest that serotonergic and/or noradrenergic, but not cholinergic mechanisms, may underlie the exaggerated immobility of the FSL rats.
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