Effect of number of tailshocks on learned helplessness and activation of serotonergic and noradrenergic neurons in the rat. (2005)
- Authors:
- Autor USP: NOGUEIRA, MARIA INES - ICB
- Unidade: ICB
- Assunto: ANATOMIA
- Language: Português
- Abstract: Objetivo: Analyze the activation of serotoninergic and noradrenergic neurons after a variable number of inescapable tailshocks. Métodos e Resultados: Adult male albino rats were exposed to varying numbers of tailshocks (0, 10, 50 or 100). The following day, their escape latencies in a shuttlebox were measured in order to estimate the degree of learned helplessness (LH) produced by the varying number of shocks. Only the groups exposed to 50 or 100 shocks displayed evidence of LH. In a parallel experiment, c-fos activation was used to determine the degree of activation of raphe serotonergic neurons (FosIR + 5-HT) and locus coeruleus (LC) noradrenergic neurons (FosIR + TH) produced by the same shock conditions. Compared to unhandled cage controls, all shock groups (0 shocks was a restrained group) significantly activated both raphe and LC neurons. The 50 and 100 shock groups had significantly higher degrees of activation of serotonergic neurons in the rostral raphe groups and the LC than the 0 and 10 shock groups (Table2). Conclusões: These data are consistent with the hypothesis that activation of rostral raphe serotonergic neurons and LC noradrenergic neurons beyond a certain threshold may be critical for the development of LH. The relevance of these results for elucidating the neural bases of psychopathology are discussed
- Imprenta:
- Publisher: Federação de Sociedades de Biologia Experimental
- Publisher place: Águas de Lindóia, São Paulo
- Date published: 2005
- Source:
- Título: Resumos
- Conference titles: Reunião Anual da Federação de Sociedades de Biologia Experimental, FeSBE
-
ABNT
TAKASE, L. F. et al. Effect of number of tailshocks on learned helplessness and activation of serotonergic and noradrenergic neurons in the rat. 2005, Anais.. Águas de Lindóia, São Paulo: Federação de Sociedades de Biologia Experimental, 2005. . Acesso em: 22 jan. 2026. -
APA
Takase, L. F., Nogueira, M. I., Bland, S. T., Baratta, M., Watkins, M., Maier, S. F., et al. (2005). Effect of number of tailshocks on learned helplessness and activation of serotonergic and noradrenergic neurons in the rat. In Resumos. Águas de Lindóia, São Paulo: Federação de Sociedades de Biologia Experimental. -
NLM
Takase LF, Nogueira MI, Bland ST, Baratta M, Watkins M, Maier SF, Fornal CA, Jacobs BL. Effect of number of tailshocks on learned helplessness and activation of serotonergic and noradrenergic neurons in the rat. Resumos. 2005 ;[citado 2026 jan. 22 ] -
Vancouver
Takase LF, Nogueira MI, Bland ST, Baratta M, Watkins M, Maier SF, Fornal CA, Jacobs BL. Effect of number of tailshocks on learned helplessness and activation of serotonergic and noradrenergic neurons in the rat. Resumos. 2005 ;[citado 2026 jan. 22 ] - Administração de fluoxetina durante a lactação: estudo dos neurônios serotoninérgicos no núcleo dorsal da rafe em ratos Wistar
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