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Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2013.tde-02102013-094530
Document
Author
Full name
Daniel Kanda Abe
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Dall'Oglio, Marcos Francisco (President)
Duarte, Ricardo Jordão
Fonseca Filho, Limirio Leal da
Gonçalves, Pierre Damião
Guimarães, Gustavo Cardoso
Title in Portuguese
Análise da expressão dos genes CD105 (endoglina), VEGF, VEGFR1 e VEGFR2 no carcinoma de células renais e correlação com fatores prognósticos
Keywords in Portuguese
Angiogênese patológica
Marcadores biológicos
Neoplasias renais
Prognóstico
Abstract in Portuguese
INTRODUÇÃO: A angiogênese tem sido proposta como um marcador de prognóstico em uma variedade de tumores incluindo o renal. No avanço da compreensão da biologia molecular do carcinoma de células renais (CCR) os genes CD105 (endoglina), VEGF, VEGFR1 e VEGFR2 são seletivamente expressos em células endoteliais vasculares sendo estudados como potenciais alvos terapêuticos. OBJETIVOS: Este estudo analisou a expressão destes quatro genes no tecido renal normal e CCR e suas correlações com os fatores prognósticos para a neoplasia. MÉTODOS: Os níveis de expressão de CD105, VEGF, VEGFR1 e VEGFR2 foram analisados por Reação da Transcriptase Reversa em tempo real (qRT-PCR) em amostras de tumor fresco congelado coletados de 56 pacientes submetidos à nefrectomia parcial ou radical por CCR. Neste estudo foram avaliados os níveis de expressão dos genes em tecidos normais e tumorais e comparados com fatores prognósticos como tamanho tumoral (> ou <= 7 cm), Grau de Fuhrman (1-2 e 3-4) e invasão microvascular (presente ou ausente). RESULTADOS: A análise dos quatro genes demonstrou que CD105 esta subexpresso em 94.7% dos casos e a superexpressão de VEGF, VEGFR1 e VEGFR2 ocorreu em 53,6%, 85,7% e 64,3% dos casos respectivamente. A expressão de endoglina foi significativamente maior em pacientes com doença metastática (p=0,05) em relação ao grupo sem metástases. Além disso, o gene do VEGFR2 foi associado com estadiamento T, apresentando uma média de expressão maior nos pacientes portadores de doença pT1-2 (p=0,04). CONCLUSÕES: Nossos experimentos demonstraram que a endoglina está subexpressa em carcinoma de células renais em relação com o tecido renal normal e a presença de níveis mais elevados está relacionada à doença metastática. Os genes VEGF, VEGFR1 e VEGFR2 encontram-se superexpressos no CCR e uma maior expressão do gene VEGFR2 está relacionada com estadiamento T1 e T2
Title in English
Expression analysis of CD105 (endoglin), VEGF, VEGFR1 and VEGFR2 in kidney cancer and relationship with prognostic factors
Keywords in English
Biological markers
Kidney neoplasm
Pathological angiogenesis
Prognosis
Abstract in English
INTRODUCTION: Angiogenesis has been proposed as a prognostic marker in a variety of human malignancies, including renal cancer. Due to a better understanding of the underlying biology of Renal Cell Carcinoma (RCC) the genes expression of CD105 (endoglina), VEGF, VEGFR1 and VEGFR2 that are selectively expressed in vascular endothelial cells are being studied as potential therapeutic targets. OBJECTIVES: This study analyzed the expression of these four genes in normal kidney tissue and RCC and relationship with prognostic factors. METHODS: CD105, VEGF, VEGFR1 and VEGFR2 expression levels were analyzed by quantitative real-time polymerase chain reaction (qRT-PCR) in fresh-frozen malignant tissue specimens collected from 56 patients submitted to radical or partial nephrectomy. This study assessed the expression of genes in normal and tumor tissues, and compared with classic prognostic parameters in CCRCC , such as tumor size (larger or smaller than 7 cm) Fuhrman grade (1-2 and 3-4) and microvascular invasion (this or absent). RESULTS: The analysis of these four genes showed that CD105 is subexpressed in 94.7% of cases and the overexpression of VEGF, VEGFR1 and VEGFR2 occurred in 53.6%, 85.7% and 64.3% of cases respectively in tumor tissues compared to controls. The expression of endoglin was significantly higher in patients with metastatic disease (p = 0.05). In addition, VEGFR2 gene was associated with stage T, with an average of expression higher in patients with stage T1-T2 (p = 0.040). Conclusions: These experiments demonstrated that endoglin was underexpressed in RCC compared to normal kidney and the presence of enhanced expression is associated with metastatic disease. VEGF, VEGFR1 and VEGFR2 were overexpressed in the CCRCC and a higher VEGFR2 expression was related with stage T1-2
 
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Publishing Date
2013-10-02
 
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