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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2017.tde-20022018-173243
Document
Author
Full name
Adam Arai Martens
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2017
Supervisor
Committee
Santelli, Glaucia Maria Machado (President)
Bassères, Daniela Sanchez
Forti, Fábio Luís
Ionta, Marisa
Paschoalin, Thaysa
 
Title in Portuguese
Avaliação dos efeitos de compostos enantioméricos de telúrio sobre a biologia celular de melanomas humanos - enfoque em morfologia e processos celulares.
Keywords in Portuguese
Biologia celular
Melanoma metastático
Morfologia
Organotelúrio
Telúrio
Abstract in Portuguese
O melanoma metastático apresenta um alto grau de heterogeneidade, o que aumenta a dificuldade de sucesso no tratamento, com altos níveis de resistência e recidiva nos pacientes. Mesmo os avanços atuais não apresentaram a taxa de eficácia esperada no tratamento do melanoma. Estudos mostraram compostos de telúrio apresentando efeitos de seletividade em direção a células tumorais, poupando células saudáveis, chamado de efeito sensor efetor. Assim, testamos dois compostos orgânicos enantioméricos de telúrio sobre a biologia celular de linhagens de melanócitos e melanoma metastático. Os resultados mostraram que os compostos apresentam o efeito sensor efetor, e atuam sobre a morfologia das células tumorais sem afetar as células normais. Verificamos alterações de ciclo celular, entretanto não encontramos morte celular por ativação de caspase 9. Também encontramos efeitos genotóxicos para uma das linhagens. Os resultados encontrados colocam essas organoteluranas como promissoras drogas no tratamento de melanoma metastático.
 
Title in English
Evaluation of the effects of enantiomeric tellurium compound on the cell biology of melanomas focus in morphology and cellular processes.
Keywords in English
Cell biology
Metastatic melanoma
Morphology
Organotellurium
Tellurium
Abstract in English
Metastatic melanoma displays a high degree of heterogeneity, which increases difficulty of treatment success, with high levels of resistance and relapse in patients. Even the current advances have not shown the efficacy rate expected for the treatment of melanoma. Studies showed that tellurium compounds display selective effects towards tumour cells, sparing healthy ones, called sensor effector effect. Thus, we tested two enantiomeric organotellurium compounds on the cell biology of melanocyte and metastatic melanoma cell lines. Results showed that the compounds possess the sensor effector effect and act on tumour cells morphology without affecting healty cells. We found cell cycle alterations, however we did not find cell death by activation of caspse 9. We also found genotoxic effects for one of the cell lines. The results set these organotelluranes as promising drugs for the treatment of metastatic melanoma.
 
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Publishing Date
2018-02-21
 
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