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Doctoral Thesis
DOI
https://doi.org/10.11606/T.5.2011.tde-22082011-173524
Document
Author
Full name
José Carlos Sadalla
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Carvalho, Jesus Paula (President)
Aguiar, Lana Maria de
Bagnoli, Vicente Renato
Souen, Jorge Saad
Tuffi, Valéria Holmo Batista
Title in Portuguese
Expressão de claudinas e p53 em líquem escleroso e carcinoma escamoso da vulva
Keywords in Portuguese
Imunoistoquímica
Junções intercelulares
Líquen escleroso vulvar
Mutação
Neoplasias vulvares
Abstract in Portuguese
INTRODUÇÃO: O carcinoma escamoso (CEC) de vulva é um tumor ginecológico de baixa frequência, cuja incidência aumenta com o passar dos anos. Entre as vias patogenéticas, destaca-se a neoplasia intraepitelial vulvar (NIV) diferenciada, que está relacionada com o líquen escleroso (LE). A maioria dos estudos publicados comparou o CEC vulvar com LE no âmbito morfológico apenas. Poucos avaliaram estas afecções em relação à biologia molecular, e nenhum avaliou o papel da junção intercelular (TJ). Nosso objetivo foi analisar a expressão de claudinas (proteínas atuantes na TJ) e do p53 nestas doenças. CASUÍSTICA E MÉTODOS: avaliamos o produto do oncogene TP53 e a expressão das claudinas 1, 2, 3, 4, 5, 7 e 11 em amostras de tecido vulvar humano de três grupos de pacientes: LE, CEC isolado (ICEC) e grupo controle. RESULTADOS: As claudinas 1, 2, 3 e 4 foram expressas igualmente nos três grupos. As claudinas 5, 7 e 11 não foram expressas nos grupos LE e ICEC, estando presentes apenas no grupo controle. Esta diferença foi significativa apenas para as claudinas 7 (p=0,013) e 11 (p=0,001). A proteína p53 foi mais expressa no grupo ICEC, seguida pelo LE e pelo grupo controle (p=0,017). CONCLUSÕES: As claudinas 5, 7 e 11 não se expressaram nos casos de LE e/ou ICEC. As claudinas 7 e 11 foram expressas apenas no grupo controle. Houve perda da expressão das claudinas 7 e 11 nos grupos com doença (LE e ICEC), em comparação ao grupo controle. Não houve diferença na expressão de claudinas entre os grupos LE e ICEC. Observou-se presença de p53 nos grupos estudados, cuja distribuição variou conforme o grupo analisado. Esta expressão foi maior no grupo ICEC, seguido pelo LE e, menor, no grupo controle
Title in English
Claudins and p53 expression in vulvar lichen sclerosus and squamous cell carcinoma
Keywords in English
Immunohistochemistry
Mutation
p53
Tight junctions
Vulvar lichen sclerosus
Vulvar neoplasms
Abstract in English
AIMS: Vulvar squamous cell carcinoma (SCC) is a rare gynaecologic cancer. Vulvar SCC has been shown to develop from vulvar intraepithelial neoplasias (VINs), which are related to lichen sclerosus (LS). Most studies to date have compared vulvar SCC to LS only morphologically, but no detailed molecular analysis has been performed. Our objective was to compare claudin and p53 expression in these diseases and determine if there was an association with expression and vulvar SCC progression. METHODS: Immunohistochemical analysis was performed in order to determine expression of p53 and claudin 1, 2, 3, 4, 5, 7, and 11 in human vulvar tissue samples from LS, SCC, and control patients. RESULTS: Claudin 1, 2, 3, 4, and 5 were expressed comparably in the three groups. Claudin 7 and 11 expression was significantly decreased in LS and SCC samples (p=0,013 and 0,001, respectively) compared with the control group. Expression of p53 was significantly increased in SCC and LS patient samples compared with the control group (p=0,017). CONCLUSIONS: Claudins 7 and 11 were expressed only in control group. There was loss of expression of claudins 7 and 11 in the disease groups (LS and/or SCC), comparing to control group. However, there was no significant difference in expression of any of the claudins between the LS and SCC samples. Furthermore, p53 expression is higher in SCC patients and lower in control group. However, expression of p53 did not vary between samples from isolated LS (ILS) and LS associated with SCC (ALSSCC) patients
 
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Publishing Date
2011-08-24
 
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