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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

Distribui??o de neur?nios nitr?rgicos no dienc?falo do moc? (Kerodon rupestris)

Reis, Maria Emanuela Martins dos 20 December 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-03-21T18:43:42Z No. of bitstreams: 1 MariaEmanuelaMartinsDosReis_DISSERT.pdf: 5769860 bytes, checksum: 74ddebdf2f9b77f3786b50ef1260466c (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-03-28T00:21:34Z (GMT) No. of bitstreams: 1 MariaEmanuelaMartinsDosReis_DISSERT.pdf: 5769860 bytes, checksum: 74ddebdf2f9b77f3786b50ef1260466c (MD5) / Made available in DSpace on 2017-03-28T00:21:34Z (GMT). No. of bitstreams: 1 MariaEmanuelaMartinsDosReis_DISSERT.pdf: 5769860 bytes, checksum: 74ddebdf2f9b77f3786b50ef1260466c (MD5) Previous issue date: 2016-12-20 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / O ?xido n?trico (NO) ? uma mol?cula muito simples (N=O), gasosa, com propriedades qu?micas de um radical livre e at? meados da d?cada de 1980 era considerado apenas membro de uma fam?lia de poluentes ambientais indesej?veis e carcin?genos potenciais. Desde sua descoberta no sistema nervoso, NO tem sido implicado em diversas fun??es, o que condiz com sua ampla distribui??o no enc?falo. NO tamb?m tem sido descrito no enc?falo de diversas esp?cies animais, mas ainda n?o foi descrito em moc? (Kerodon rupestris), um roedor end?mico da caatinga brasileira que habita ?reas rochosas e tem h?bitos crepusculares. Devido a estas caracter?sticas interessantes objetivamos descrever a distribui??o do NO do dienc?falo do moc?. Atrav?s das t?cnicas de imunoperoxidase padr?o contra a ?xido n?trico sintase (NOS), enzima de s?ntese de NO, e histoqu?mica para NADPH-diaforase pudemos identificar de forma indireta a presen?a de neur?nios nitr?rgicos ao longo de todo dienc?falo. O hipot?lamo apresentou uma densidade alta de neur?nios imunorreativos a NOS (NOS-IR) em v?rios n?cleos, dentre eles alguns como o n?cleo supra?ptico, decussa??o supra?ptica e a parte lateral da ?rea retroquiasm?tica. Com densidade moderada temos a ?rea pr?-?ptica lateral, o n?cleo pr?-?ptico magnocelular, a parte parvocelular anterior e a parte parvocelular medial do n?cleo paraventricular do hipot?lamo, o n?cleo ventrolateral do hipot?lamo, a parte peduncular da ?rea hipotal?mica lateral e o n?cleo posterior do hipot?lamo. A divis?o anterior do n?cleo ventromedial do hipot?lamo e a ?rea hipotal?mica dorsal apresentaram densidade baixa, e a parte lateral do n?cleo pr?-?ptico medial apresentou densidade muito baixa. No t?lamo, neur?nios NOS-IR estiveram presentes no n?cleo geniculado ventral com densidade alta. Na parte lateral do n?cleo habenular lateral, o n?cleo tal?mico posterodorsal ventral e a parte mediocaudal do n?cleo tal?mico posterior com densidade moderada. O n?cleo paraventricular do t?lamo, zona incerta e o n?cleo tal?mico parafascicular, apresentaram densidade baixa. Comparando nossos resultados com o descrito em outros animais podemos dizer que o sistema nitr?gico ? um sistema de neurotransmissor evolutivamente bem conservado. / Nitric oxide (NO) is a simple molecule (N=O), a gas with a free radical property whose until the 80s was considered a member of a family of environmental pollutants and a potential carcinogen. Since its discovery in the nervous system, NO has been implicated in several functions, what suits with its wide distribution in the brain. NO has been described in the brain of many animal species, but it was not described in the brain of the rocky cave (Kerodon rupestris), an endemic rodent of the Brazilian caatinga that inhabits rocky areas and have crepuscular habits. Due to these interesting characteristics we aim to describe the NO distribution of the rocky cavy diencephalon. Using standard immunoperoxidase against nitric oxide synthase (NOS), the NO synthesis enzyme, and histochemistry for NADPH-diaphorase, we were able to indirectly identify the presence of nitrergic neurons throughout the entire diencephalon. The hypothalamus showed a high density of NOS-IR neurons in several nuclei, among them the supraoptic nucleus, supraoptic decussation and the lateral part of the retrochiasmatic area. With moderate density we have the lateral pre-optic area, the preocular magnocellular nucleus, the anterior parvocellular part and the medial parvocellular part of the paraventricular nucleus of the hypothalamus, the ventrolateral nucleus of the hypothalamus, the peduncular part of the lateral hypothalamic area and the posterior nucleus of the hypothalamus. The anterior division of the ventromedial nucleus of the hypothalamus and the dorsal hypothalamic area presented low density, and the lateral part of the medial pre-optic nucleus presented very low density. In the thalamus, NOS-IR neurons were present in the ventral geniculate nucleus with high density. In the lateral part of the lateral habenular nucleus, the ventral posterodorsal thalamic nucleus and the mediocaudal part of the posterior thalamic nucleus with moderate density. The paraventricular nucleus of the thalamus, zona incerta and the parafascicular thalamic nucleus, presented low density. Comparing our results with those described in other animals we can say that the nitric system is an evolutionarily well-conserved neurotransmitter system.

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