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Doctoral Thesis
DOI
https://doi.org/10.11606/T.42.2011.tde-20032012-151205
Document
Author
Full name
Welbert de Oliveira Pereira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Mendes, Joao Gustavo Pessini Amarante (President)
Barbuto, Jose Alexandre Marzagao
Oliveira, Andre Luiz Vettore de
Santelli, Glaucia Maria Machado
Viola, João Paulo de Biaso
Title in Portuguese
Papel do gene da síndrome de Wiskott Aldrich (WASP) na leucemia mielóide crônica.
Keywords in Portuguese
Apoptose
Células cultivadas de tumor
Leucemia mieloide
Leucemia mielóide crônica
Marcador molecular
Neoplasias
Abstract in Portuguese
Bcr-Abl é a tirosina quinase (TK) responsável por causar a Leucemia Mielóide Crônica (LMC). Os últimos estudos de follow-up mostram que apenas 50% dos pacientes tratados com a segunda geração de inibidores de TK atinge a remissão completa, o que significa que metade desses pacientes necessita de um algo melhor do que está disponível. Wiskott Aldrich Syndrome Protein (WASP) é um gene essencial para o bom desenvolvimento e função das células hematopoiéticas. Ante esse contexto, decidimos investigar se WASP poderia ter algum papel ou relevância na LMC. Em conclusão, Bcr-Abl suprime a expressão WASP por um mecanismo epigenético. A re-expressão de WASP torna as células mais suscetíveis à apoptose em resposta ao Imatinib. Sugerimos que a recuperação da expressão WASP deve ser discutida como estratégia para a terapia da LMC.
Title in English
The role of Wiskott Aldrich syndrome protein (WASP) in the chronic myeloid leukemia.
Keywords in English
Apoptosis
Chronic myeloid leukemia
Molecular marker
Myeloid leukemia
Neoplasms
Tumor cells grown
Abstract in English
Bcr-Abl is the tyrosine kinase (TK) responsible for causing Chronic Myeloid Leukemia (CML). This fusion protein up- and down-regulates several genes and pathways, producing a strong resistance to apoptosis and a blockage of cell maturation in the hematopoietic compartment. The last follow-up studies provided that only 50% of the patients treated with second generation achieve complete remission, what means that one-half of these patients needs something better. Wiskott Aldrich Syndrome Protein (WASP) is an essential gene for the proper development and function of the hematopoietic cells. In the light of this background, we decided to investigate if WASP could have some role or relevance in the CML context. In conclusion, Bcr-Abl suppresses WASP expression by an epigenetic mechanism. The re-expression of WASP makes the CML cells more susceptible to apoptosis and contribute to respond to Imatinib. We suggest that recovery of WASP expression should be discussed as a new and additional strategy for CML therapy.
 
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Publishing Date
2012-05-25
 
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