Attenuation of stress-induced behavioral changes by activation of serotonin type 7 receptors in the median raphe nucleus of rats

Autor(es)

Lazarini-Lopes, Willian ^[1] ; Corsi-Zuelli, Fabiana ^[1] ; Padovan, Claudia M. ^{[2, 3]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Ribeirao Preto - Brazil

^[2] Inst Neurociencias & Comportamento INeC, Ribeirao Preto - Brazil

^[3] Univ Sao Paulo, Fac Filosofia, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PSYCHOPHARMACOLOGY; v. 34, n. 8, p. 901-913, AUG 2020.
• Citações Web of Science: 0

Resumo

Background: Exposure to stressful aversive situations induces physiological and behavioral changes. Serotonin has been suggested to mediate such changes, as well as adaptation to stressful events. Serotoninergic projections arising from the median raphe nucleus to the dorsal hippocampus have been suggested to promote adaptation to chronic aversive stimuli. Such pathway may involve serotonin type 1a receptor-mediated neurotransmission. However, the serotonin 7 receptor can also be found in the median raphe nucleus and may be involved in mechanisms underlying response to stress. Aims: In this work we sought to investigate if activation of serotonin type 7 receptors would attenuate stress-induced deficits in different animal models of depression. Methods: Male Wistar rats with a guide-cannula aimed to the median raphe nucleus were submitted to restraint or forced swim stress and were tested in an elevated plus maze or forced swim test, respectively, 24 h later. SB 258741 (serotonin type 7 receptor antagonist) and/or LP 44 (serotonin type 7 receptor agonist) were administered intra-median raphe nucleus immediately before or after exposure to stress or before test. Control groups received intra-median raphe nucleus treatment 24 h or immediately before test in the elevated plus maze or forced swim test. Results: LP 44 attenuated restraint-induced exploratory deficits independently of the moment it was administered. Similar results were observed in the forced swim test, with the exception on post-stress condition. These effects on adaptation to stress induced by serotonin type 7 receptor activation were prevented by previous treatment with SB 258741. Conclusions: Our data support the idea that activation of median raphe nucleus serotonin 7 receptor is important to the development of adaptation to stress. (AU)

• Processo FAPESP: 14/26753-8 - Papel dos receptores de serotonina de tipo 5-HT7 do núcleo mediano da rafe nas consequências comportamentais do estresse de restrição e do nado forçado
• Beneficiário: Willian Lazarini Lopes
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/07773-5 - Papel de receptores de serotonina de tipo 5-HT7 na resposta ao estresse de restrição
• Beneficiário: Willian Lazarini Lopes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica