Comparison of rats selectively bred for high and low ethanol intake in a forced-swim-test model of depression: effects of desipramine.
This investigation examined if there is a relationship between selective breeding for high or low alcohol intake and immobility in a force-swim-test (i.e., "behavioral despair") model of depression. Time spent immobile in a water-filled cylinder was measured in the alcohol-preferring (P and nonpreferring (NP) lines of rats, and in the high-alcohol-drinking (HAD) and low-alcohol-drinking (LAD) lines. Each rat was tested for 2 10-min trials administered 24 h apart, and pretreatment with saline or desipramine (10.0 or 20.0 mg desipramine/kg b.wt. i.p.) also was evaluated. Drug was administered immediately after Trial 1 and again 1 h before Trial 2. When tested without pretreatment in Trial 1 or with saline pretreatment in Trial 2, NP rats spent significantly more time immobile than did P rats, but no comparable line differences were found when HAD and LAD rats were tested. Desipramine pretreatment reduced the time spent immobile in rats of the 2 alcohol-nonpreferring lines (i.e., the NP and LAD rats), but had no significant effect in rats of the 2 alcohol-preferring lines (the P and HAD rats). These findings do not support the hypothesis that there is a functional relationship between high alcohol drinking and susceptibility to "behavioral despair" as measured by the forced-swim test. The results with desipramine suggest that selection for high alcohol intake may be associated with insensitivity to desipramine.
Godfrey
C D
CD
Department of Psychology, Purdue School of Science, Indiana University/Purdue University at Indianapolis 46202, USA.
Froehlich
J C
JC
Stewart
R B
RB
Li
T K
TK
Murphy
J M
JM
D000428:Alcohol Drinking; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D003863:Depression / Q000188:drug therapy; D003891:Desipramine / Q000494:pharmacology*; D004195:Disease Models, Animal; D008297:Male; D051381:Rats
D003891:Desipramine