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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2020.tde-15032021-132453
Document
Author
Full name
Helena Nascimento Malerba
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Viel, Tânia Araújo (President)
Abilio, Vanessa Costhek
Munhoz, Carolina Demarchi
Torrão, Andréa da Silva
Title in Portuguese
Avaliação molecular da neuroplasticidade de animais tratados com lítio em ambiente enriquecido.
Keywords in Portuguese
Ambiente Enriquecido
Lítio
Memória
Neuroproteção
Abstract in Portuguese
Com o aumento da longevidade populacional a aplicação de conhecimentos gerontológicostorna-se uma ferramenta de grande valor para promover um envelhecimento saudável. A proximidade da velhice acarreta aumento de doenças crônicas que muitas vezes podem ser debilitantes. Nos últimos anos nosso grupo de pesquisa vem estudando os beneficíos do enriquecimento ambiental e administração de microdoses dos íons de lítio para a melhora da memória de animais e seres humanos, o que pode levar à longevidade com saúde. Postanto o objetivo do projeto foi verificar a efetividade do tratamento com microdoses de lítio, por via oral, em camundonos pertencentes à linhagem que apresenta envelhecimento acelerado (SAMP-8, "senescece-accelerated mouse") combinada ou não com o enriquecimento ambiental, para a promoção do envelhecimento saudável. Os animais SAMR-1 ("senescence-accelerated mouse resistant") foram utilizados como controles dos animais SAMP-8. Os camundongos SAMP-8 foram divididos em quatro grupos: 1) Grupo Controle: sem tratamento e sem estímulação; 2) Grupo Lítio (Li): tratados com 0,25 mg/kg de carbonato de lítio, dissolvidos na água de beber; 3) Grupo Ambiente Enriquecido (AE): colocados diariamente em ambiente enriquecido, constituído por diferentes objetos; 4) Grupo Li+AE: tratados com lítio e colocados em ambiente enriquecido. Ao atingirem 10 meses de idade foi possível observar que os animais SAMP-8 controle tiveram uma diminuição da memória quando comparados aos animais SAMR-1. Além disso, apresentaram menos densidade neuronal, maior área de neurodegeneração, maior densidade de placas senis e diminuição da densidade de sinaptofisina em relação aos aniamis SAMR-1. Os tratamentos por si só promoveram resultados semelhantes. É possível sugerir que as estratégias propostas, combinadas ou não, são benéficas para animais com envelhecimento acelerado, contribuindo assim para a manutenção da memória na velhice.
Title in English
Molecular evalution of neuroprotection after treatment of mice with lithium and submition to enriched enviorement.
Keywords in English
Enriched Enviorement
Lithium
Memory
Neuroprotection
Abstract in English
With the increase in population longevity, the gerontological approach to promote healthier aging is also rising. The proximity of elderly causes an increase in the prevalence of diseases, especially chronic diseases that can be debilitating. Over the last few years, our research team have been studied the benefits of enriched environment and lithium in microdoses to improve memory of mice and humans, which can lead to healthy aging. The aim of this project was to verify the benefits of with treatment with lithium in microdose combined or not with enriched environment for the healthy aging of senescence accelerated mice (SAMP-8). Male SAMP-8 mice (2 months old) were divided into four groups: 1) Control group: without treatment and without stimulation; 2) Lithium group: treated with 0.25mg/kg of lithium carbonate, dissolved in the drinking water; 3) Enriched Environment group (EE): animals submitted to enriched environment (toys in the cage); 4) Lithium + EE group: treated with lithium and submitted to EE. SAMR-1 (senescence-accelerated mouse resistant") was used as control of SAMP-8. Memory was evaluated along the aging process of animals and when they were 10 months old they were anesthetized and killed and the brains were isolated and frozen. SAMP-8 presented lower amount of neuronal density, higher neurodegeneration area, higher density of amyloid- plaques and higher density of synaptophysin when compared to SAMR-1 hippocampal samples. The SAMP-8 group that was in enriched environment and was treated with lithium presented memory and neuronal maintenance, decreased density of beta-amyloid plaques, increased density of synapthophysin and decrease in hippocampal degeneration. The treatments alone promoted similar results. It is possible to suggest that the proposed strategies combined or not, are benefic for animals with an accelerated aging, thus contributing to memory maintenance in old age.
 
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Publishing Date
2022-12-01
 
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