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Neuroscience. 2014 Feb 28;260:195-204. doi: 10.1016/j.neuroscience.2013.12.011. Epub 2013 Dec 14.

Attenuation of mania-like behavior in Na(+),K(+)-ATPase α3 mutant mice by prospective therapies for bipolar disorder: melatonin and exercise.

Author information

1
Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario M5S 1A8, Canada. Electronic address: greershelby@gmail.com.
2
Cell and System Biology, University of Toronto, Toronto, Ontario M5S 3G3, Canada.
3
Department of Psychology, Neuroscience and Behavior, McMaster University, Hamilton, Ontario L8N 3Z5, Canada.
4
Department of Psychiatry and Behavioral Neurosciences, McMaster University, Hamilton, Ontario L8N 3Z5, Canada.
5
Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario M5G 1X5, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario M5S 1A8, Canada; Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.

Abstract

Bipolar disorder is a neuropsychiatric disease characterized by states of mania with or without depression. Pharmacological treatments can be inadequate at regulating mood for many individuals. Melatonin therapy and aerobic exercise are independent prospective therapies for bipolar disorder that have shown potential as mood stabilizers in humans. Myshkin mice (Myk/+) carry a heterozygous missense mutation in the neuronal Na(+),K(+)-ATPase α3 and model mania-related symptoms of bipolar disorder including increased activity, risk-taking behavior and reductions in sleep. One cohort of Myk/+ and wild-type littermates (+/+) was treated with melatonin and a separate cohort was treated with voluntary exercise. Mania-related behavior was assessed in both cohorts. The effect of melatonin on sleep and the effect of exercise on brain-derived neurotrophic factor (BDNF) expression in the hippocampus were assayed. Melatonin and voluntary wheel running were both effective at reducing mania-related behavior in Myk/+ but did not affect behavior in +/+. Melatonin increased sleep in Myk/+ and did not change sleep in +/+. Myk/+ showed higher baseline levels of BDNF protein in the hippocampus than +/+. Exercise increased BDNF protein in +/+ hippocampus, while it did not significantly affect BDNF levels in Myk/+ hippocampus. These findings support initial studies in humans indicating that melatonin and exercise are useful independent adjunct therapies for bipolar disorder. Their effects on mood regulation should be further examined in randomized clinical trials. Our results also suggest that hippocampal BDNF may not mediate the effects of exercise on mania-related behavior in the Myk/+ model of mania.

KEYWORDS:

ANOVA; Atp1a3; BDNF; EDTA; EEG; ELISA; EMG; ENU; EPM; LDB; Myk; Myshkin; N-ethyl-N-nitrosourea; Na(+),K(+)-ATPase α3; REM; RT-PCR; SEM; analysis of variance; bipolar disorder; brain-derived neurotrophic factor; electroencephalographic; electromyographic; elevated plus maze; enzyme-linked immunosorbent assay; ethylenediaminetetraacetic acid; light–dark box; mania; melatonin; rapid eye movement; real-time polymerase chain reaction; standard error of mean; voluntary exercise

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