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Master's Dissertation
DOI
10.11606/D.5.2017.tde-26012017-102913
Document
Author
Full name
Rita de Cássia Oliveira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Faria, Sabrina Thalita dos Reis (President)
Cordeiro, Mauricio Dener
Dip Júnior, Nelson Gaspar
Title in Portuguese
Perfil de expressão de microRNAs envolvidos na regulação de genes associados à angiogênese no carcinoma renal das células claras
Keywords in Portuguese
Biomarcadores tumorais
Carcinoma de células renais
Estadiamento de neoplasias
MicroRNAs
Neoplasia
Neovascularização patológica
Prognóstico
Abstract in Portuguese
INTRODUÇÃO: O Carcinoma de Células Renais (CCR) é reposnsável por mais de 200.000 casos a cada ano no mundo, representando cerca de 2% de todos os cânceres. O CCR do tipo células claras (CRCC) é o subtipo mais comum da doença e é responsável por 75 a 80% dos casos, com maiores taxas de invasão local, desenvolvimento de metástases e mortalidade. As novas terapias alvo são baseadas em moléculas e anticorpos antiangiogênicos alterando o curso da doença, mas os resultados até agora não são satisfatórios. OBJETIVOS: Nosso objetivo nesse estudo foi estudar miRNAs e seus possíveis genes alvo relacionados com a angiogênese em CRCC tentando trazer novos conhecimentos relacionados às vias moleculares associadas à doença. MÉTODOS: Os níveis de expressão dos miRNAs miR-99a, 99b, 100, 199a, 106a, 106b, 29a, 29b, 29c, 126, 200a, 200b e seus respectivos genes alvo: mTOR, HIF1-alfa, VHL, PDGF, VEGF, VEGFR1 e VEGFR2 foram avaliados por alfaRT-PCR utilizando amostras de tecido tumoral de 56 pacientes com diagnóstico de CRCC e 5 amostras de tecido renal benigno como controle. Os resultados foram comparados com o tamanho tumoral, grau nuclear de Fuhrman e invasão microvascular, considerando os critérios de risco propostos por Dall'Oglio et al (2007). RESULTADOS: Encontramos subexpressão da maioria dos genes, exceto VEGFA e PDGF, enquanto que a análise dos miRNAs mostrou subexpressão apenas dos miRs 100 e 126. Comparamos a expressão dos genes com seus possíveis miRNAs reguladores, e encontramos que mTOR apresentou subexpressão, enquanto miR99a apresentou superexpressão na maioria das amostras. Esta relação também ocorreu entre VEGFA e o miR126 e entre os miRNAs 106a, 106b, e seu gene alvo VHL. Considerando os grupos de risco, a superexpressão do miR200b foi associada com pacientes de alto risco (p = 0,01) e a superexpressão do miR126 foi associada com menor grau de Fuhrman (I-II) (p = 0,03). CONCLUSÕES: Os resultados mostram que em CRCC há um desequilíbrio na expressão de genes e miRNAs relacionadas com a angiogênese. Além disso através dos nossos achados podemos especular o papel do miR200b e do miR126 no prognóstico de CRCC
Title in English
MicroRna expression profile involved in the regulation of genes associated with angiogenesis in the renal clear cell carcinoma
Keywords in English
microRNAs
Neoplasm
Neoplasm staging
Neovascularization pathologic
Prognosis
Renal cell carcinoma
Tumor biomarkers
Abstract in English
BACKGROUND: There are more than 200,000 cases of renal cell carcinoma (RCC) each year in the world, accounting for approximately 2% of all cancers. RCC clear cell type (ccRCC) is the most common subtype of RCC and accounts for 75 to 80% of the cases with highest rates of local invasion, development of metastasis and mortality. New target therapy is based on antiangiogenic antibodies and molecules, changing the course of the disease, but the results so far are disappointing. OBJECTIVES: Our aim is to study miRNAs and their target genes related to angiogenesis in ccRCC trying to bring some new knowledge to the molecular pathways related to the disease. METHODS: The expression levels of miRNAs miR-99a, 99b, 100; 199a; 106a; 106b; 29a; 29b; 29c; 126; 200a, 200b and their respective target genes: mTOR, HIF1-Î ±, VHL, PDGF, VEGF, VEGFR1 and VEGFR2 were evaluated using alfaRT-PCR.in snap-frozen tumor tissue samples from 56 patients diagnosed with ccRCC and 5 samples of benign renal tissue as control. The results were related to tumor size, Fuhrman nuclear grade and microvascular invasion, considering the risk criteria proposed by Dall'Oglio et al. (2007). RESULTS: We compared the expression of genes with their possible regulatory miRNAs, and we found that mTOR was underexpressed while miR99a was overexpressed in most samples. This relationship also occurs between VEGFA and miR126 and between miRNAs 106a, 106b, and their target gene VHL. Considering the risk groups the overexpression of miR200b was associated with high-risk patients (p = 0.01) and the overexpression of miR126 was associated with lower Fuhrman grade (I-II) (p = 0.03). CONCLUSIONS: Our results show that in ccRCC there is an unbalance in the expression of genes and miRNAs related to angiogenesis and cell proliferation and survival. Furthermore with our findings we can speculate the role of miR200b and miR126 in the prognostic of ccRCC. We believe that the relationship between miRNAs and their respective genes should be more profoundly searched as markers and possible therapeutic agents in this neoplasia
 
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Publishing Date
2017-01-26
 
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