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Background

The 5-hydroxytryptamine7 receptor (5-HT7) is implicated in circadian rhythm phase resetting, and 5-HT7 receptor-selective antagonists alter rapid eye movement (REM) sleep parameters in a pattern opposite from those in patients with clinical depression.

Methods

As sleep, circadian rhythm, and mood regulation are related, we examined 5-HT7 receptor knockout mice in two behavioral models of depression. The forced swim and tail suspension tests are highly predictive for antidepressant drug activity.

Results

Unmedicated 5-HT7-/-mice showed decreased immobility in both tests, consistent with an antidepressantlike behavior. The selective 5-HT7 receptor antagonist SB-269970 also decreased immobility. The selective serotonin reuptake inhibitor citalopram, a widely used antidepressant, decreased immobility in both 5-HT7+/+ and 5-HT7-/-mice in the tail suspension test, suggesting that it utilizes an independent mechanism. The 5-HT7-/-mice spent less time in and had less frequent episodes of REM sleep, also consistent with an antidepressantlike state.

Conclusions

The 5-HT7 receptor might have a role in mood disorders and antagonists might have therapeutic value as antidepressants."xsd:string
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http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/author"Sutcliffe J.G."xsd:string
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/author"Henriksen S.J."xsd:string
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/author"Huitron-Resendiz S."xsd:string
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/author"Hedlund P.B."xsd:string
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/date"2005"xsd:gYear
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/name"Biol Psychiatry"xsd:string
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http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/title"5-HT7 receptor inhibition and inactivation induce antidepressantlike behavior and sleep pattern."xsd:string
http://purl.uniprot.org/citations/16018977http://purl.uniprot.org/core/volume"58"xsd:string
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