associação entre a carga viral de hpv de alto risco, expressão de p16ink4a e lesões intra-epiteliais escamosas do colo uterino association between high risk hpv viral load, p16ink4a expression and intra-epithelial cervical lesions

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ID: 153382
2007
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Abstract
OBJETIVO: Determinar a carga viral do HPV de alto risco em lesões intra-epiteliais escamosas do colo uterino e sua associação com a expressão da proteína p16INK4a. MÉTODOS: Foram analisadas 109 amostras de biópsias de colo uterino (57 de tecido normal, 26 de lesões intra-epiteliais escamosas de baixo grau LSIL, e 26 de lesões intra-epiteliais escamosas de alto grau - HSIL). A determinação da presença do HPV de alto risco e sua carga viral foi feita por biologia molecular, com captura de híbridos, por meio de coleta de células de colo uterino previa à biópsia. O material histológico foi preparado e testado por imunohistoquímica, utilizando p16INK4a kit (clone E6H4). RESULTADOS: Encontrou-se 57,8% de positividade para HPV de alto risco nos 109 casos estudados, sendo 29,8% nos casos normais, 80,8 % nos casos com LSIL e 96,1% nos casos de HSIL. A expressão da proteína p16INK4a ocorreu em 23,8 % do total casos com SIL (15,4% dos casos com LSIL e 84,6% dos casos com HSIL), porém não houve qualquer caso positivo nos tecidos sem lesão intra-epitelial. A carga viral foi significativamente superior para os casos positivos para p16INK4a, sendo a média de 669,9 RLU/PCB (9,47 a 2814,9), em relação aos casos negativos em que a média foi de 253,94 RLU/PCB (1.07 a 1882,21) (p<0.05). Mas, analisando apenas as HSIL, a diferença não foi significativa. CONCLUSÃO: No presente estudo, embora a carga viral de HPV de alto risco tenha demonstrado uma diferença significativa entre casos positivos e negativos para p16, nos casos de HSIL isto não foi confirmado. Novos estudos, com maior número de casos, são necessários para conclusões mais consistentes.
OBJECTIVE: To determine the (HR-HPV) high risk HPV viral load in squamous intra-epithelial lesions and association with p16INK4a expression. METHODS: A series of 109 cervical biopsies were studied (57 normal tissue, 26 low grade squamous intra-epithelial lesions [LSIL] and 26 high grade squamous intra-epithelial lesions [HSIL]). Detection of high risk HPV and viral load in cervical cells was made by molecular biology using hybrid capture 2nd generation collected before the biopsy. The p16INK4a was identified by immunohistochemistry using the p16INK4a kit (clone E6H4). RESULTS: High risk HPV was positive in 57.8% of all cases (29.8% in normal tissue, 80.8% in LSIL and 96.1% in HSIL). Protein p16INK4a was expressed in 23.8 % of squamous intra-epithelial lesions (15.4% in LSIL and 84.6% in HSIL). In normal tissue all cases were negative to p16INK4a. The viral load was higher in p16 positive cases than in negative cases (positive p16INK4a mean of 669.9 RLU/PCB [9.47 - 2814.9] and negative p16INK4a mean of 253.94 RLU/PCB [1.07 1882.21] (p<0.05). However when studying just the HSIL cases differences were not significant. CONCLUSION: In this study although the HR-HPV viral load had shown a significant difference between p16 positive and negative cases, in HSIL cases this finding was not confirmed. New studies with a larger number of cases are necessary for consistent conclusions.
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Authors ;Jose Eleutério Junior;Paulo César Giraldo;Diane Isabelle Magno Cavalcante;Ana Katherine Gonçalves;Renata Mirian Nunes Eleutério
Journal acta crystallographica section e
Year 2007
DOI
10.1590/S0104-42302007000600022
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-42302007000600022
Keywords
hpv cervical cancer p16 viral loadmedicine (general)

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