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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

Salicylate generates anxiety-like behavior and type 2 theta oscillation in the ventral hippocampus of mice

Benz, Rafael Franzon 20 September 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T23:16:39Z No. of bitstreams: 1 RafaelFranzonBenz_DISSERT.pdf: 10736405 bytes, checksum: ca4d2c8372c3631326a624f5404a7a3e (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-11T23:43:23Z (GMT) No. of bitstreams: 1 RafaelFranzonBenz_DISSERT.pdf: 10736405 bytes, checksum: ca4d2c8372c3631326a624f5404a7a3e (MD5) / Made available in DSpace on 2017-04-11T23:43:23Z (GMT). No. of bitstreams: 1 RafaelFranzonBenz_DISSERT.pdf: 10736405 bytes, checksum: ca4d2c8372c3631326a624f5404a7a3e (MD5) Previous issue date: 2016-09-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Salicilato, o principal composto de diversos medicamentos, como a Aspirina, ? conhecido por causar zumbido se consumido em altas doses ou de forma cr?nica (para o tratamento de osteoporose, por exemplo). Zumbido ? o ouvir ou a percep??o de um som quando nenhum est?mulo f?sico est? presente. O zumbido n?o ? uma doen?a em si, mas um sintoma presente em diversas doen?as, e est? associado ? ansiedade e outros dist?rbios de humor. Apesar de estar diretamente ligado ao sistema auditivo, o zumbido n?o ? gerado a partir de uma regi?o espec?fica do c?rebro. Al?m disso, alguns estudos mostraram que o salicilato afeta v?rias regi?es cerebrais al?m do sistema auditivo, como o estriado, amigdala e o hipocampo. Estudos iniciais atribu?ram uma fun??o unit?ria ao hipocampo: processamento de memorias declarativas. Entretanto, estudos mais recentes mostraram que o hipocampo n?o s? possui outras fun??es, como processamento emocional, mas tamb?m pode ser dividido em ventral e dorsal, e a parte ventral desempenha um papel essencial no processamento emocional. A oscila??o mais estudada do c?rebro ? o r?tmo teta, e ela pode ser encontrada em todo o hipocampo. Dois tipos de teta podem ser distinguidos: o teta tipo 1, que ? resistente a atropina, possui uma frequ?ncia mais alta (7 a 10 Hz) e est? relacionado com comportamentos de padr?o motor; e o teta tipo 2, que ? sens?vel a atropina, possui uma frequ?ncia mais baixa (4 to 7 Hz) e ocorre durante anestesia, estado de imobilidade vigilante e situa??es de alta ansiedade. O presente estudo investigou os efeitos eletrofisiol?gicos do salicilato no hipocampo ventral de camundongos em estado de comportamento. Atrav?s da inje??o de salicilato foi gerado teta tipo 2 no hipocampo ventral. Tamb?m foi encontrado que o salicilato leva a comportamentos de ansiedade. / Salicylate, the main compound of many medications as Aspirin, is known to cause tinnitus if consumed in high doses or in a chronic way (for the treatment of osteoporosis, for example). Tinnitus is the hearing or perception of a sound when no physical stimulus is present. Tinnitus is not a disease itself, but a symptom present in some diseases, and is associated with anxiety and other mood disorders. Despite being directly related with auditory system, tinnitus is not generated from one specific region of the brain. Additionally, some studies showed that salicylate affects various brain regions besides the auditory system, as the striatum, amygdala and the hippocampus. Early studies have ascribed a unitary function to the hippocampus: declarative memory processing. However, more recent studies showed that the hippocampus not only has other functions, as emotional processing, but also can be divided into ventral and dorsal, and the ventral part plays an essential role in emotional processing. The most studied oscillation of the brain is the theta rhythm, and it can be found in the entire hippocampus. Two types of theta can be distinguished: the type 1, that is atropine resistant, has a higher frequency (7 to 10 Hz) and is related with motor pattern behaviors; and the type 2 theta, that is atropine sensitive, has a lower frequency (4 to 7 Hz) and occur during anesthesia, alert immobility and high arousal situations. The present study investigated the electrophysiological effects of salicylate in the ventral hippocampus of behaving mice. Through salicylate injection we generated type 2 theta in the ventral hippocampus. We also found that salicylate led to anxietylike behavior

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