comparação entre dois métodos de detecção de dna de papilomavírus humano em carcinoma epidermoide de lábio comparison between two methods for human papilomavírus dna detection in lip squamous cell carcinoma

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ID: 209040
2010
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Abstract
Introdução: Recentemente o papilomavírus humano (HPV) tem sido associado à carcinogênese oral. A metodologia empregada na detecção do vírus é uma das maiores causas observadas da grande variabilidade nas taxas de detecção do HPV. Objetivo: Este estudo comparou a sensibilidade de detecção do DNA do HPV em casos de carcinoma epidermoide de lábio utilizando a amplificação do DNA viral por reação em cadeia da polimerase (PCR) ou nPCR. Material e método: Foram utilizadas 33 amostras provenientes de casos de carcinoma epidermoide de lábio. Para as extrações do DNA utilizou-se o sistema QIAamp DNA Mini Kit. Como controle interno utilizou-se o gene da b-globina. Das 33 amostras iniciais, 30 foram positivas para o gene b-globina, sendo utilizadas para detectar o DNA viral. Comparou-se a amplificação do DNA viral pelos métodos da PCR com os oligonucleotídeos MY09/MY11 e nPCR, empregando-se os pares de oligonucleotídeos iniciadores MY09/MY11 e, na segunda etapa, o par GP5+/GP6+. O controle positivo para a presença do DNA do HPV utilizado foi a linhagem de células HeLa e, como controle negativo, a mistura de amplificação sem DNA. A análise dos produtos de PCR e nPCR para HPV foi realizada por eletroforese em gel de poliacrilamida a 8%. Resultados: Utilizando-se o método da PCR, a amplificação do DNA do HPV foi constatada em dois casos. Com a nPCR foi verificada presença de DNA viral em 13 das 30 amostras. Conclusão: Com a utilização da nPCR, a detecção do HPV nos casos estudados aumentou mais de seis vezes.
Introduction: Human papillomavirus (HPV) has been currently associated with oral carcinogesis. The methodology applied in virus detection is one of the main reasons for the great variability observed in HPV detection. Objectives: This study compared HPV DNA detection efficiency in lip squamous cell carcinoma samples (SCC) using viral DNA amplification by PCR or nPCR. Methods: Thirty three samples of lip squamous cell carcinoma were selected. DNA extractions were performed with QIAamp DNA minikit. The internal control was b-globin gene. Thirty out of 33 initial samples were positive for b-globin gene, which were employed to detect viral DNA. The amplification of viral DNA was compared by PCR method through MY09/MY11 oligonucleotides and nPCR through MY09/MY11 oligonucleotides in the first stage and GP5+/GP6+ in the second stage. HeLa cells were used as positive control for HPV DNA presence and the amplification mixture without DNA as negative control. The analysis of PCR and nPCR products for HPV DNA was performed through gel electrophoresis in polyacrylamide at 8%. Results: HPV DNA amplification was verified in two cases by the use of PCR method. HPV DNA presence was verified in 13 out of 30 samples by the use of nPCR. Conclusion: HPV DNA detection of lip SCC increased sixfold in the studied cases with the employment of nPCR.
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Authors ;Adriana Demathe;Daniel Galera Bernabé;José Fernando Garcia;Caris Maroni Nunes;Glauco Issamu Miyahara
Journal industrial and engineering chemistry research
Year 2010
DOI
10.1590/S1676-24442010000200003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-24442010000200003
Keywords
hpv oral cancer human papillomavirus pcr hpvpathology

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