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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

AvaliaÃÃo do potencial antimicrobiano de lectinas e outras substÃncias naturais frente a bactÃrias orais / Antimicrobial potencial analysis of lectins and other natural substances against oral bacteria

Theodora Thays Arruda Cavalcante 26 March 2012 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / Os biofilmes sÃo uma forma mais resistente de vida microbiana comparada à forma planctÃnica, em vida livre. Essa resistÃncia està diretamente relacionada Ãs caracterÃsticas naturais de sobrevivÃncia das cÃlulas microbianas vivendo nesse tipo de comunidade. A doenÃa cÃrie capaz de acometer os tecidos dentais està diretamente relacionada com a formaÃÃo de comunidades microbianas e ainda apresenta grande impacto social e econÃmico sobre a sociedade atual. O presente trabalho teve como objetivo investigar a potencialidade de compostos vegetais como insumos biotecnolÃgicos a serem aplicados na prevenÃÃo e tratamento da cÃrie dental. Para tanto, foram realizadas metodologias de verificaÃÃo da atividade antimicrobiana e antibiofilme de lectinas vegetais do gÃnero Canavalia e Ãleos essenciais de Croton zehntneri assim como de seus componentes majoritÃrios frente a bactÃrias envolvidas na cÃrie. AlÃm disso, foi verificada a possÃvel aÃÃo simultÃnea de lectinas e diterpeno casbano (DC) sobre a expressÃo de genes de virulÃncia relacionados à formaÃÃo de biofilmes de Streptococcus mutans. Dentro dos limites das metodologias realizadas no presente trabalho pode-se concluir que: lectinas vegetais do gÃnero Canavalia podem interferir no fator micro-organismos relacionado à cÃrie dental; Ãleos essenciais e seus componentes majoritÃrios apresentaram atividade antimicrobiana significativa sobre S. mutans e ainda que as soluÃÃes da lectina ConM e ConM/DC atuando simultaneamente foram capazes de alterar a expressÃo de genes relacionados a formaÃÃo de biofilmes por S. mutans, podendo vir a ser usado em estudos prÃ-clÃnicos no intuito de instituir novas alternativas de prevenÃÃo e terapÃutica para doenÃa cÃrie. / Biofilms are more resistant form of microbial life compared to planktonic form, in the wild. This resistance is related to the natural characteristics of survival of microbial cells living in this type of community. The caries that can affect the dental tissues is directly related to the formation of microbial communities and still has great social and economic impact on society. This study aimed to investigate the potential of plant compounds as biotechnological inputs to be applied in prevention and treatment of dental caries. To this end, methods were performed to verify the antimicrobial and antibiofilme activity of plant lectins of the genus Canavalia and essential oils of Croton zehntneri as well as its major components against bacteria involved in caries. Furthermore, was verified the possible simultaneous action of lectins and casban diterpene (DC) on the expression of virulence genes related to biofilm formation of Streptococcus mutans. Within the methodology undertaken in this work can be concluded that: lectins of the genus Canavalia can interfere with the factor micro-organisms related to dental caries; essential oils and their major components showed significant antimicrobial activity against S. mutans and that solutions of ConM lectin and ConM/DC acting simultaneously were able to alter the expression of genes related to biofilm formation by S. mutans, and may be used in preclinical studies in order to develop new alternatives for prevention and therapy for caries.

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