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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2000.tde-26032001-142114
Document
Author
Full name
Renata Manelli de Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2000
Supervisor
Committee
Santelli, Glaucia Maria Machado (President)
Gama, Patricia
Jaeger, Marcia Martins Marques
Title in Portuguese
Citoesqueleto e Alterações Nucleares em Celulas Tumorais: Uma Abordagem Tridimensional ao Microscópio Confocal.
Keywords in Portuguese
alterações nucleares
célula tumoral
citoesqueleto
imunofluorescência
micronúcleo
microscópio confocal
Abstract in Portuguese
O mecanismo de formação e origem das alterações nucleares ainda é pouco conhecido, sendo o micronúcleo a mais estudada. As células tumorais geralmente apresentam vários tipos de alterações nucleares que estariam associadas à instabilidade genética. O objetivo deste trabalho foi analisar as possíveis associações entre alterações nucleares e citoesqueleto em células HK2 e A549, derivadas de carcinoma de pulmão humano. Otimizamos a metodologia de uso do MCVL para redefinir as alterações nucleares e caracterizar os principais filamentos do citoesqueleto em preparações coradas por Feulgen ou imunofluorescência. As células da linhagem HK2 apresentaram fibras de actina dispostas concentricamente e em "clusters" e os filamentos de tubulina apareceram de forma radial, enquanto que o padrão de distribuição em A549 foi mais semelhante ao das células normais (BRL3A). Os filamentos de lamina B foram os mais importantes para evidenciar as alterações nucleares, porém essas alterações não puderam ser relacionadas com alterações do citoesqueleto.
Title in English
Cytoskeleton and nuclear aberrations in tumor cells: a confocal microscope 3D approach.
Keywords in English
confocal microscope
cytoskeleton
immunoflorescence
micronucleus
nuclear aberrations
tumor cells
Abstract in English
The origin and mechanism of formation of the nuclear alterations is largely unknown, with the micronucleus being the most well studied alteration. Tumor cells generally present various types of nuclear alterations witch can be associated with genetic instability. The propose of this study was to analyze the possible association between nuclear alterations and the cytoskeleton in the human lung carcinoma cells HK2 and 549. The method of LSM was optimized to redefine the nuclear alterations and to characterize the principal cytoskeletal filaments in preparations stained with Feulgen’s reagent or submitted to imunofluorescent methods. The HK2 cells presented actin fibres arranged either concentrically or in clusters and tubulin filaments arranged radially, while in the A549 cells the distribution pattern was similar to that of normal cells (BRL3A). The lamin B filaments were the most important to identify nuclear alterations, as these alterations could not be related to cytoskeletal alterations.
 
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Publishing Date
2008-10-03
 
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