Abstract:
:Serotonin (5-HT) neurons project from the raphe nuclei throughout the brain where they act to maintain homeostasis. Here, we study 5-HT inputs into the bed nucleus of the stria terminalis (BNST), a major subdivision of the extended amygdala that has been proposed to regulate responses to anxiogenic environments in humans and rodents. While the dorsal part of the BNST (dBNST) receives dense 5-HT innervation, whether and how 5-HT in the dBNST normally modulates anxiety remains unclear. Using optogenetics, we demonstrate that activation of 5-HT terminals in the dBNST reduces anxiety in a highly anxiogenic environment. Further analysis revealed that optogenetic inhibition of 5-HT inputs into the dBNST increases anxiety in a less anxiogenic environment. We found that 5-HT predominantly hyperpolarizes dBNST neurons, reducing their activity in a manner that can be blocked by a 5-HT1A antagonist. Finally, we demonstrate that activation of 5-HT1A receptors in the dBNST is necessary for the anxiolytic effect observed following optogenetic stimulation of 5-HT inputs into the dBNST. These data reveal that 5-HT release in the dBNST modulates anxiety-like behavior via 5-HT1A receptors under naturalistic conditions.
journal_name
Mol Psychiatryjournal_title
Molecular psychiatryauthors
Garcia-Garcia AL,Canetta S,Stujenske JM,Burghardt NS,Ansorge MS,Dranovsky A,Leonardo EDdoi
10.1038/mp.2017.165subject
Has Abstractpub_date
2018-10-01 00:00:00pages
1990-1997issue
10eissn
1359-4184issn
1476-5578pii
10.1038/mp.2017.165journal_volume
23pub_type
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