Journal
JOURNAL OF NEUROSCIENCE
Volume 32, Issue 13, Pages 4562-4580Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.6458-11.2012
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [22248033, 20390073, 21390045, 22790233, 23791325, 19659017, 22659213]
- Regional Joint Research Program
- Ministry of Education, Culture, Sports, Science, and Technology
- Ministry of Health and Labour and Welfare
- Ministry of Health, Labour, and Welfare
- Japan Society for the Promotion of Science
- Brain Research Center
- Ministry of Science and Technology, Republic of Korea
- Grants-in-Aid for Scientific Research [19659017, 20390073, 22790233, 22248033, 21390045, 23791325] Funding Source: KAKEN
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The ubiquitin-proteasome system (UPS) controls the stability of most cellular proteins. The polymorphism of UPS-related genes is associated with major depression disorder, but less is known about the molecule that plays a role in depression by modulating the UPS. Melanoma antigen gene-D1 (MAGE-D1) interacts with RING E3 ubiquitin ligase and is implicated in protein degradation. MAGE-D1 may thus play an important role in the CNS via ubiquitylation. Here, we clarified a novel role of MAGE-D1 in emotional functions, namely its modulation of ubiquitylation to the serotonin transporter (SERT). The MAGE-D1 knock-out and knockdown by small interfering RNA (siRNA) in the prefrontal cortex showed depression-like behavior, such as a decrease in exploratory behavior in both the home cage and novel apparatus, a decrease in social interaction, increased immobility time during forced swimming and tail suspension, and a decrease in sucrose preference without any anxiety, or cognitive or motor dysfunction. Acute and chronic (28 d) administration of sertraline (10 mg/kg) and imipramine (20 mg/kg) reversed all or part of depression-like behavior in knock-out mice. In these mice, the serotonergic function in the prefrontal cortex and hippocampus was hypoactive, accompanied by hyperexpression of SERT attributable to a decrease in ubiquitylation. Furthermore, MAGE-D1 binds to SERT via the necdin homology domain. MAGE-D1 overexpression in cells resulted in a decrease in serotonin uptake activity and the protein level of SERT but an increase in ubiquitylated SERT. Together, the present findings suggest a novel role for MAGE-D1 in depressive behaviors: modulating SERT ubiquitylation.
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