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Doctoral Thesis
DOI
10.11606/T.25.2011.tde-16082011-090855
Document
Author
Full name
Renata Cordeiro Teixeira
Institute/School/College
Knowledge Area
Date of Defense
Published
Bauru, 2011
Supervisor
Committee
Damante, Jose Humberto (President)
Garlet, Gustavo Pompermaier
Neves, Lucimara Teixeira das
Nogueira, Renato Luiz Maia
Nunes, Fabio Daumas
Title in Portuguese
Estudo microscópico morfométrico e genotípico de pacientes portadores de lesão central de células gigantes
Keywords in Portuguese
Biologia molecular
Células gigantes
Contagem de células
Abstract in Portuguese
A lesão central de células gigantes (LCCG) é uma afecção benigna dos maxilares, de comportamento biológico incerto, variando de discreta tumefação assintomática e de crescimento lento à uma forma agressiva, associada a dor, reabsorção radicular e óssea, com destruição cortical. Sua etiologia permanece desconhecida, havendo controvérsias entre processo reacional, neoplásico ou genético. Mutações no gene SH3BP2 foram identificadas em pacientes com querubismo, condição que compartilha várias características clínicas, radiográficas e histopatológicas com a LCCG. Para testar a hipótese de que tais mutações seriam responsáveis por, ou estariam associadas a LCCG e na tentativa de melhor entender a diferenciação microscópica/morfométrica das lesões agressivas e não agressivas, vinte e cinco pacientes portadores de LCCG foram selecionados para o estudo. O DNA foi obtido através do sangue e de espécimes em blocos de parafina, oriundos de biópsias e tratamento cirúrgico. Um estudo microscópico morfométrico foi paralelamente realizado, para avaliar o número de células gigantes e densidade de volume das mesmas nas lesões agressivas e não agressivas. O sequenciamento genético dos treze exons do gene SH3BP2 nos vinte e cinco pacientes estudados evidenciou uma alteração no códon do exon 4 em 10 pacientes. A densidade de volume de células gigantes foi maior nas lesões agressivas quando comparadas às não agressivas (p=0,013). Não houve diferença significante quanto ao número de células gigantes/mm2 em lesões agressivas e não agressivas (p =0,245).
Title in English
Microscopic morphometric and genotypic assessment of patients with central giant cell lesions
Keywords in English
Cell counting
Giant cells
Molecular Biology
Abstract in English
Central giant cell lesion (CGCL) is a benign disease of the jaws, with uncertain behavior, ranging from mild asymptomatic slow-growing swelling to an aggressive form, with pain, radicular and bone resorption and cortical destruction. Its aetiology is still unknown and there is discussion whether it is a reactive, neoplastic or genetic disease. Mutations on gene SH3BP3 were identified in patients with cherubism, which shares several clinical, radiographic and histopathological features with CGCL. In order to test the hypothesis that such mutations would be responsible for or would be related to CGCL and also in order to better understand microscopic morphometric differentiation of the aggressive and non-aggressive lesions, 25 patients with CGCL were selected to this study. DNA was extracted from blood samples and from tissue samples, obtained by biopsy or surgical treatment. Microscopic morphometric assessment was also performed, in order to evaluate the number and the volume density of the giant cells in aggressive and in non-aggressive lesions. Gene sequencing of all 13 exons in gene SH3BP3, performed on each of the 25 patients, showed an alteration in one codon from exon 4, in ten patients. Volume density of giant cells was greater in aggressive lesions than in non-aggressive ones (p=0,013). There was no significant difference on the number of giant cells per mm2 when comparing aggressive and non-aggressive lesions.
 
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Publishing Date
2011-08-22
 
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