Morfometria do cerebelo de ratos machos UChA e UChB submetidos a separação materna neonatal (consumidores voluntários de etano)
Carregando...
Data
2008-09-25
Autores
Oliveira, Suelen Alves de [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Experiências traumáticas na infância estão associadas ao aumento do risco de abuso de álcool e de outras drogas na adolescência e na vida adulta. Crianças e adolescentes maltratados manifestam distúrbios do sistema biológico de resposta ao estresse. A exposição crônica a fatores estressantes aumenta a atividade do eixo hipotálamo-hipófise-adrenal (HHA). Sendo o cerebelo local de ação do etanol, onde o consumo de forma abusiva altera o equilibro e a coordenação motora e que vários aspectos do alcoolismo podem ser frutos do estresse vivido precocemente, este trabalho buscou investigar e avaliar se a separação materna neonatal, aplicada em filhotes machos de ratos UChA e UChB, potencializa os efeitos tóxicos da ingestão crônica de álcool sobre a morfometria dos estratos cerebelares dos animais estudados. Para isso, utilizou-se modelo de alcoolismo experimental (ratos UChA e UChB) e de indução de hiper-reatividade do eixo HHA (Separação Materna). Foram realizadas análises microscópicas e morfométricas. Para morfometria as variáveis estudadas foram: massa corpórea(g), consumo de álcool(g/Kg/dia), altura do córtex cerebelar (μm), altura do estrato molecular(μm), granuloso (μm), purkinjense (μm) e áreas dos citoplasmas das células de Purkinje (μm2). O estresse neonatal não alterou o padrão de consumo de etanol das linhagens UChA e UChB, houve alterações nos níveis plasmáticos de corticoesterona. O córtex cerebelar dos animais UCh mostrou-se menor que no Wistar, sendo a SM fator protetor para atrofia desta região nos grupos SMUChA e SMCO. Os estratos granular e purkinjense mantiveram o padrão de alteração do córtex cerebelar, com a SM atenuando os efeitos do consumo crônico de etanol. Já a camada molecular encontrou-se maior nos animais UChB, onde após indução de hiper-reatividade do eixo HHA ocorreu a atrofia deste grupo. Portanto...
Traumatic experiences in the childhood are associated to an increase in the risk of alcohol and other drugs abuse in the adolescence and in the adulthood. Abused children and adolescents manifest diseases in their biological system in response to that stress. The chronic exposition to stressing factors increases the activity of the hypothalamus-hypophysis-adrenal axis (HHA). The ethanol acts in the cerebellum where the abusive consumption alters the balance and the motor coordination; that is, many aspects of the alcoholism might be consequences of the stress experienced in early years. This research investigated and evaluated if the neonatal maternal separation, applied to UChA and UChB male rats, potentializes the toxic effects of the alcohol chronic ingestion on the cell morphometry of cerebellar extracts in the studied animals. For that, both, the experimental alcoholism model (UChA and UChB rats) and the hipper-reactivity induction of the HHA axis (Maternal Separation) were used. Microscopic and morphometrics analysis were also accomplished. For morphometry, the variables analyzed were: corporal mass (g), alcohol consumption (g/Kg/day), cerebellar cortex height (um), molecular extract height (um), granular (um), Purkinje fibers (um), and cytoplasm areas of the Purkinje cells (um2). The neonatal stress did not alter the ethanol consumption pattern of the UChA and UChB lineages; however, there were alterations in the corticosterone plasmatic levels. The cerebellar cortex of the UCh animals have shown to be smaller than the Wistar ones, and the SM has shown to be a protecting factor for this region atrophy in the SMUChA and SMCO groups. The granular and Purkinje fiber extracts have kept the cerebellar cortex alteration patterns, having the SM lessen the effects of the ethanol chronic consumption. The molecular layer was bigger in the UChB animals, where after the hipperreactivity induction of the HHA axis there was an atrophy of this group.
Traumatic experiences in the childhood are associated to an increase in the risk of alcohol and other drugs abuse in the adolescence and in the adulthood. Abused children and adolescents manifest diseases in their biological system in response to that stress. The chronic exposition to stressing factors increases the activity of the hypothalamus-hypophysis-adrenal axis (HHA). The ethanol acts in the cerebellum where the abusive consumption alters the balance and the motor coordination; that is, many aspects of the alcoholism might be consequences of the stress experienced in early years. This research investigated and evaluated if the neonatal maternal separation, applied to UChA and UChB male rats, potentializes the toxic effects of the alcohol chronic ingestion on the cell morphometry of cerebellar extracts in the studied animals. For that, both, the experimental alcoholism model (UChA and UChB rats) and the hipper-reactivity induction of the HHA axis (Maternal Separation) were used. Microscopic and morphometrics analysis were also accomplished. For morphometry, the variables analyzed were: corporal mass (g), alcohol consumption (g/Kg/day), cerebellar cortex height (um), molecular extract height (um), granular (um), Purkinje fibers (um), and cytoplasm areas of the Purkinje cells (um2). The neonatal stress did not alter the ethanol consumption pattern of the UChA and UChB lineages; however, there were alterations in the corticosterone plasmatic levels. The cerebellar cortex of the UCh animals have shown to be smaller than the Wistar ones, and the SM has shown to be a protecting factor for this region atrophy in the SMUChA and SMCO groups. The granular and Purkinje fiber extracts have kept the cerebellar cortex alteration patterns, having the SM lessen the effects of the ethanol chronic consumption. The molecular layer was bigger in the UChB animals, where after the hipperreactivity induction of the HHA axis there was an atrophy of this group.
Descrição
Palavras-chave
Marcadores morfológicos e moleculares, Álcool, Alcoolismo - Estudos experimentais, Cerebellum, Ethanol
Como citar
OLIVEIRA, Suelen Alves de. Morfometria do cerebelo de ratos machos UChA e UChB submetidos a separação materna neonatal (consumidores voluntários de etano). 2008. 76 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Botucatu, 2008.