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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influ?ncia da exposi??o neonatal ? fluoxetina sobre o comportamento e express?o neuroqu?mica de parvalbumina em ratos Wistar machos e f?meas, juvenis e adultos

Meurer, Ywlliane da Silva Rodrigues 13 March 2017 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-07-17T13:05:37Z No. of bitstreams: 1 YwllianeDaSilvaRodriguesMeurer_TESE.pdf: 1373910 bytes, checksum: d491e059868659b49cc5906532ddf376 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-07-18T14:01:06Z (GMT) No. of bitstreams: 1 YwllianeDaSilvaRodriguesMeurer_TESE.pdf: 1373910 bytes, checksum: d491e059868659b49cc5906532ddf376 (MD5) / Made available in DSpace on 2017-07-18T14:01:06Z (GMT). No. of bitstreams: 1 YwllianeDaSilvaRodriguesMeurer_TESE.pdf: 1373910 bytes, checksum: d491e059868659b49cc5906532ddf376 (MD5) Previous issue date: 2017-03-13 / Inibidores seletivos de recapta??o de serotonina (ISRS) s?o amplamente utilizados no tratamento de depress?o e ansiedade em v?rios est?gios da vida do indiv?duo, inclusive durante a gravidez ou lacta??o. Nessa circunst?ncia, com o feto in utero ou em amamenta??o, o mesmo ser? exposto a influ?ncia da hiperestimula??o seroton?rgica capaz de desorganizar o desenvolvimento morfofuncional do SNC. A modula??o do circuito seroton?rgico no c?rebro em desenvolvimento pode alterar a organiza??o e forma??o de diferentes redes neurais espec?ficas e repercutir na express?o comportamental do indiv?duo. Neste sentido, utilizamos o ISRS ? fluoxetina (dose: 10mg/kg)? no per?odo de desenvolvimento PND7PND21, para investigar poss?veis altera??es persistentes na neuroqu?mica e no comportamento de ratos machos e f?meas durante as idades p?snascimento de 45 (PND45) e 90 dias (PND90). Outros tr?s grupos experimentais foram utilizados como controle da administra??o farmacol?gica, s?o eles: Naive (animais n?omanipulados), Sham (animais residentes nas gaiolas de tratamento sem manipula??o) e Veh (animais residentes nas gaiolas de tratamento que recebiam inje??o de ?gua destilada). Nosso trabalho re?ne um conjunto de dados comportamentais complementares e tamb?m in?ditos relacionados a avalia??o do comportamento mnem?nico, da ansiedade e tipodepressivo nos animais nessas diferentes idades e em ambos os sexos. Aqui observamos aumento na ansiedade (avaliada no teste de campo aberto), altera??es de mem?ria de curto prazo (atrav?s dos paradigmas de reconhecimento de objetos e alterna??o espont?nea), bem como manifesta??o do comportamento tipodepressivo (usando os testes de prefer?ncia de sacarose e nata??o for?ada) na prole em idade de 45 dias. Enquanto que na idade adulta (PND90) foi observada (atrav?s dos paradigmas comportamentais usados na avalia??o da prole juvenil) redu??o nos n?veis de ansiedade, manuten??o das altera??es de mem?ria de curto prazo, bem como atenua??o do perfil tipodepressivo. Em ambas idades foram observadas redu??o no n?mero de neur?nios parvalbuminapositivos, contudo somente animais em idade PND45 tratados com fluoxetina apresentaram redu??o significativa e ainda quando comparados com os grupos Naive e Sham, mas n?o ao grupo Veh. Por isso, mais estudos s?o necess?rios para investigar os efeitos persistentes da serotonina sobre a matura??o, prolifera??o e migra??o de interneur?nios para as regi?es corticais. Os animais expostos ao ISRS apresentam maior tra?o de altera??es nos comportamentos de ansiedade e tipodepressivo. Nosso trabalho exp?e altera??es mnem?nicas decorrentes da exposi??o previa a fluoxetina, sugerindo altera??es persistentes no circuito corticol?mbico. Estes achados sugerem que a modula??o do circuito seroton?rgico durante per?odos cr?ticos do desenvolvimento do sistema nervoso central pode alterar a organiza??o dos diferentes circuitos neuroqu?micos e induzir altera??es comportamentais, as quais podem repercutir para o surgimento de dist?rbios neuropsiqui?tricos. / Selective serotonin reuptake inhibitors (SSRIs) are widely prescribed to treat depression, anxiety and other disorders. The developmental exposure to selective serotonin reuptake inhibitors (SSRIs) results in persistent behavioural impairment into adulthood. In this way, serotonergic overexpression in early life may lead to structural and functional changes in brain circuits that control cognitive and emotional behaviour. Here, we addressed the question of how postnatal (PND7PND21) exposure to fluoxetine affects memory, anxietyand depressionlike behaviours, as well as neurochemical markers of interneurons and serotonergic cells in brain areas related to these behaviours in juvenile (PND45) and adult (PND90) female and male rats. In a first stage, we analysed both female and male rat?s performances in several behavioural tasks and investigated the expression of serotonin (5HT) in the dorsal and median nucleus of raphe, and parvalbumin (PV) in PFCm and hippocampus at PND45. We found that earlylife exposure to fluoxetine increased anxietyand depressionlike behaviours (more in female compared to male animals), and induced a working memory impairment only in the juvenile male. Afterwards, we performed behavioural and neurochemical analysis of male and female adult rats (PND90), where we found that fluoxetine affects only anxietyrelated male behaviour. Also, the memory impairment (more in male than female) and depressivelike profile (both sexes) remained in adult age. Moreover, the exposure to fluoxetine affect PV immunoreactivity in the hippocampus in any sex at PND45 and PND90; however, adult animals appear to recover neurochemical deficits observed at the juvenile age. The results revealed developmental fluoxetine effects on juvenile behaviour that can have implications for affective disorders and mnemonic processes. These results revealed persistent changes a sex and agemanner related to developmental exposure to fluoxetine, where serotonergic modulation induce differential profile of anxietyand depressionlike behaviour and mnemonic impairment on female and male rats at juvenile and adult age. Also, suggest a sexdependent compensatory mechanism, which it is possibly related to serotonergic sinalisation. Circuits may involve subcortical and cortical information processing, including subcortical limbic and possible (pre)frontal areas. Thus, our findings suggest that serotonergic modulation during critical periods of SNC development may alter the organisation of excitatoryinhibitory circuit and induce behavioural changes, which may have repercussions for the onset of neuropsychiatric disorders.

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