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Master's Dissertation
DOI
https://doi.org/10.11606/D.59.2017.tde-25092017-151256
Document
Author
Full name
João Gabriel Curtolo Poiani
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2017
Supervisor
Committee
Silva, Carlos Henrique Tomich de Paula da (President)
Lourenço, Ricardo Vessecchi
Santos, Cleydson Breno Rodrigues dos
Title in Portuguese
Planejamento racional de candidatos a fármacos inibidores de glicogênio sintase cinase - 3 beta (GSK-3B) em doença de Alzheimer
Keywords in Portuguese
Doença de Alzheimer
Glicogênio sintase cinase
Planejamento de fármacos.
Proteínas cinases
Triagem virtual
Abstract in Portuguese
A Doença de Alzheimer (DA) é um transtorno progressivo que acomete o Sistema Nervoso Central, causando demência em idosos. A doença leva a uma diminuição da memória, dificuldade no raciocínio e pensamento e alterações comportamentais. A fisiopatologia da doença corresponde ao aumento na concentração do peptídeo -amilóide com consequente deposição e formação da placa amiloide; e também ao aparecimento dos emaranhados neurofibrilares, que são agregados de proteína tau hiperfosforilada. A enzima glicogênio sintase cinase 3 beta (GSK-3) está diretamente envolvida nos dois processos e, por isso, a busca por novos inibidores dessa enzima é uma importante estratégia terapêutica para o tratamento da doença. Neste trabalho utilizou-se a triagem virtual em 7 bancos de dados de moléculas aplicando cinco diferentes estratégias in silico, através de planejamento de fármacos baseado em ligantes e baseado em estrutura, combinada com estudos in silico de farmacocinética, toxicidade e atividade biológica, seguido de posteriores ensaios de inibição enzimática in vitro. Obteve-se três compostos pela metodologia de farmacóforo, (Estratégia 3) dos quais dois deles demonstraram atividade inibitória interessante para GSK-3, na faixa de micromolar. A partir das outras quatro estratégias foram selecionados 16 compostos que futuramente serão também testados utilizando o mesmo protocolo de ensaio in vitro aqui utilizado.
Title in English
Rational design of drug candidates for glycogen synthase kinase-3 beta (GSK-3) inhibitors in Alzheimer's disease.
Keywords in English
Alzheimer's disease
Drug design.
Glycogen synthase kinase
Protein kinases
Virtual screening
Abstract in English
Alzheimer's disease (AD) is a progressive disorder that affects the Central Nervous System, causing dementia in the elderly. The disease leads to decreased memory, difficulty in reasoning and thinking, and behavioral changes. The pathophysiology of the disease corresponds to the increase in -amyloid peptide concentration with consequent deposition and formation of the amyloid plaque and to the appearance of neurofibrillary tangles, which are aggregates of hyperphosphorylated tau protein. The enzyme glycogen synthase kinase-3 beta (GSK-3) is directly involved in both processes and, therefore, the search for new inhibitors of this enzyme is an important therapeutic strategy for the treatment of the disease. In this work, we used virtual screening in 7 molecule databases applying five different in silico strategies, using the ligand-based and structure-based drug design methodologies, combined with in silico studies of pharmacokinetics, toxicity and biological activity, followed by subsequent assays enzymatic inhibition in vitro. We obtained three compounds by the pharmacophore methodology (Strategy 3) of which two of them demonstrated interesting inhibitory activity for GSK-3 in the micromolar range. From the other four strategies, 16 compounds were selected which in future will also be tested using the same in vitro assay protocol used here.
 
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Publishing Date
2017-11-06
 
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