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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2013.tde-29052014-135146
Document
Author
Full name
Luana Ribeiro Ricardi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Santelli, Glaucia Maria Machado (President)
Mori, Lyria
Oliveira, Sergio Ferreira de
Title in Portuguese
Interação célula-crisotila em duas diferentes linhagens celulares: uma abordagem morfológica e molecular.
Keywords in Portuguese
Asbesto
Endocitose
Estrutura celular
Microscopia confocal
Microscopia eletrônica
Receptores celulares
Abstract in Portuguese
Asbestos é um termo geral usado comercialmente para descrever minerais fibrosos de silicato. A fibra mais utilizada até hoje é denominada crisotila, com uso considerado seguro. Embora, fragmentos menores podem permanecer por longo tempo em tecidos pulmonares. As fibras de crisotila, assim como as demais fibras de asbestos, possuem sílica na sua composição e podem ser fagocitadas com a participação de receptores scavenger. Este trabalho teve como objetivo o estudo de mecanismos de interação e de internalização das pequenas fibras de crisotila em duas linhagens celulares. Uma análise por microscopia confocal de varredura a laser e microscopia eletrônica de transmissão foi realizada e observou-se que ambas as linhagens são capazes de internalizar fibras, que apresentavam livres ou envoltas pela membrana plasmática. A presença de elementos do citoesqueleto próximos às fibras de crisotila foi verificada, assim como alterações no nível de expressão de alguns desses elementos. Dentro deste contexto, a participação de receptores no processo de internalização de fibras de crisotila também foi estudada e verificamos que esses receptores podem estar envolvidos de alguma forma com o processo de internalização de fibras de crisotila.
Title in English
Cell-chrysotile interaction in two different cell lines: a morphological and molecular approach.
Keywords in English
Asbestos
Cell structure
Cellular receptors
Confocal microscopy
Electron microscopy
Endocytosis
Abstract in English
Asbestos is a term used commercially to describe silicate minerals. Chrysotile is the most used fiber until today and it is considered safe. However, smaller fragments can be found in lung tissues for a long period of time. Chrysotile fibers, as other asbestos fibers, are composed by silica and may be phagocyted with the participation of scavenger receptors. This studys goal was to study the interaction an internalization mechanisms of small chrysotile fibers in two cell lineages. Confocal laser scan microscopy analysis and electronic microscopy transmission analysis were conducted in both lineages, that showed capable of internalize fibers, that were involved or not by cell membrane. Cytoeskeleton elements presence near the fibers was verified and there were also changes in expression levels these elements. In this context, the participation of scavenger receptors in the internalization process of chrysotile fibers was also studied, and we verified that these receptors may be associated to the internalization process of chrysotile fibers.
 
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Publishing Date
2014-05-30
 
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