title: Mouse strain differences in immobility and sensitivity to fluvoxamine and desipramine in the forced swimming test: analysis of serotonin and noradrenaline transporter binding.
abstract: Strain differences in immobility time in the forced swimming test were investigated in five strains of mice, namely, ICR, ddY, C57BL/6, DBA/2 and BALB/c mice. There were significant strain differences. The immobility times of ICR, ddY and C57BL/6 mice were longer than those of DBA/2 and BALB/c mice. Immobility times were not significantly related to locomotor activity in these strains. There were also differences in sensitivity to the selective serotonin reuptake inhibitor (SSRI) fluvoxamine. In ICR, ddY and C57BL/6 mice, fluvoxamine did not affect immobility time, while it reduced the immobility time of DBA/2 and BALB/c mice dose-dependently. The noradrenaline reuptake inhibitor desipramine decreased immobility time in all strains of mice. Serotonin (5-HT) transporter binding in the brains of all five strains of mice was also investigated. Analysis of 5-HT transporter binding revealed significant strain differences, being lower in DBA/2 and BALB/c mice than in other strains of mice. The amount of 5-HT transporter binding was correlated to baseline immobility time. However, there was no significant relation between noradrenaline transporter binding and immobility time. These results suggest that the duration of baseline immobility depends on the levels of 5-HT transporter binding, leading to apparent strain differences in immobility time in the forced swimming test. Furthermore, differences in 5-HT transporter binding may cause variations in responses to fluvoxamine.
authors.affiliation: Laboratory of Pharmacology, Department of Clinical Pharmacy, Yokohama College of Pharmacy, Matano-cho, Totsuka-ku, Yokohama, 245-0066, Japan. yumisugi@hamayaku.ac.jp
authors.forename: Yumi
authors.initials: Y
authors.lastname: Sugimoto
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Kajiwara
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Hirano
authors.forename: Shizuo
authors.initials: S
authors.lastname: Yamada
authors.forename: Noriko
authors.initials: N
authors.lastname: Tagawa
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hotta
authors.forename: Jun
authors.initials: J
authors.lastname: Yamada
mesh_terms: D000818:Animals; D018687:Antidepressive Agents, Second-Generation / Q000494:pharmacology*; D000929:Antidepressive Agents, Tricyclic / Q000494:pharmacology*; D003863:Depression / Q000188:drug therapy* / Q000523:psychology; D003891:Desipramine / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005473:Fluoxetine / Q000031:analogs & derivatives / Q000494:pharmacology; D016666:Fluvoxamine / Q000494:pharmacology*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D008813:Mice, Inbred ICR; D009043:Motor Activity / Q000187:drug effects* / Q000235:genetics*; D050484:Norepinephrine Plasma Membrane Transport Proteins / Q000378:metabolism*; D050486:Serotonin Plasma Membrane Transport Proteins / Q000378:metabolism*; D013045:Species Specificity; D013550:Swimming / Q000523:psychology*
chemical_list: D018687:Antidepressive Agents, Second-Generation; D000929:Antidepressive Agents, Tricyclic; D050484:Norepinephrine Plasma Membrane Transport Proteins; D050486:Serotonin Plasma Membrane Transport Proteins; D005473:Fluoxetine; C011386:nisoxetine; D016666:Fluvoxamine; D003891:Desipramine