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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

5-HT1A and 5-HT2A receptor control of a panic-like defensive response in the rat dorsomedial hypothalamic nucleus

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de Bortoli, Valquiria Camin [1] ; de Melo Yamashita, Paula Shimene [2] ; Zangrossi, Jr., Helio [2]
Total Authors: 3
[1] Univ Fed Espirito Santo, CEUNES UFES, Dept Hlth Sci, Sao Mateus - Brazil
[2] Univ Sao Paulo, Sch Med, Dept Pharmacol, BR-14049900 Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF PSYCHOPHARMACOLOGY; v. 27, n. 12, SI, p. 1116-1123, DEC 2013.
Web of Science Citations: 14

The dorsomedial nucleus of the hypothalamus (DMH) has long been implicated in the genesis/regulation of escape, a panic-related defensive behavior. In the dorsal periaqueductal gray matter (dPAG), another key panic-associated area, serotonin, through the activation of 5-HT1A and 5-HT2A receptors, exerts an inhibitory role on escape expression. This panicolytic-like effect is facilitated by chronic treatment with clinically effective antipanic drugs such as fluoxetine and imipramine. It is still unclear whether serotonin within the DMH plays a similar regulatory action. The results showed that intra-DMH injection of the 5-HT1A receptor agonist 8-OH-DPAT, the preferential 5-HT2A receptor agonist DOI, but not the 5-HT2C agonist MK-212, inhibited the escape reaction of male Wistar rats evoked by electrical stimulation of the DMH. Local microinjection of the 5-HT1A antagonist WAY-100635 or the preferential 5-HT2A antagonist ketanserin was ineffective. Whereas chronic (21 days) systemic treatment with imipramine potentiated the anti-escape effect of both 8-OH-DPAT and DOI, repeated administration of fluoxetine enhanced the effect of the latter agonist. The results indicate that 5-HT1A and 5-HT2A receptors within the DMH play a phasic inhibitory role upon escape expression, as previously reported in the dPAG. Facilitation of 5-HT-mediated neurotransmission in the DMH may be implicated in the mode of action of antipanic drugs. (AU)

FAPESP's process: 08/03123-8 - Role of 5-HT1A and 5-HT2A serotoninergic receptors of the dorsomedial nucleus of the hypothalamus in the mediation of defensive behaviors related to panic
Grantee:Valquíria Camin de Bortoli
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 07/03685-3 - Typical and atypical neurotransmitters in neuropsychiatric disorders
Grantee:Francisco Silveira Guimaraes
Support Opportunities: Research Projects - Thematic Grants