Abstract
The Flinders Sensitive Line rats showed an increased immobility response by 104% (P<0.01) in the forced swim test with respect to the Flinders Resistant Line rats (control). The Flinders Sensitive Line rats also had an increase of [125I]galanin (porcine) binding in the dorsal raphe (55±3.3 fmol/mg protein) with respect to the Flinders Resistant Line rats (38±3.6 fmol/mg protein) (42%, P<0.05) without changes in galanin receptor affinity and with a significant reduction (32.3%, P<0.05) of galanin-like immunoreactivity in the dorsal raphe. The results indicate that enhancement of galanin receptor function in the dorsal raphe rich in 5-HT neurons could be a mechanism involved in the production of depressive-like activity in this animal model of depression.
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