Estudo epidemiológico do HPV na mucosa oral por meio de PCR / Epidemiological study of HPV in oral mucosa through PCR

Pertencente à família Papillomaviridae, o papilomavírus humano (HPV) é formado por um capsídeo e uma única fita dupla de DNA. Sua infecção ocorre principalmente por forma sexual, apresentando grande tropismo por células cutâneas e mucosas. OBJETIVO: Avaliar a presença do HPV em mucosa oral de pacientes assintomáticos e em paralelo correlacionar os hábitos sociais comportamentais com a presença viral. MATERIAL E MÉTODO: Estudo de coorte contemporânea com corte transversal. O diagnóstico da presença viral foi realizado por PCR, utilizando os primers gerais MY09/11 em 125 amostras de mucosa oral, submetidas à extração de DNA e PCR para a pesquisa do gene da beta-globina para avaliação da qualidade do DNA extraído. Em paralelo, foi realizado um estudo de questões comportamentais dos pacientes. RESULTADOS: Todas as amostras apresentaram o diagnóstico positivo para o gene da betaglobina. O HPV foi diagnosticado em 23,2% das amostras analisadas. CONCLUSÃO: O vírus esteve presente em 29 dos 125 pacientes, sem que estes apresentassem qualquer manifestação clinicopatológica relacionada com o HPV. Quanto ao comportamento social dos pacientes, concluiu-se que a prática de sexo oral está correlacionada de forma estatisticamente significante com a presença viral, além de o HPV ter sido estatisticamente mais prevalente em pacientes do sexo feminino.

The Human Papillomavirus (HPV) belongs to the Papillomaviridae family and has a capsid and a single DNA strand. Its infection occurs mainly through sexual intercourse, having an important tropism for skin and mucosal cells. AIM: To evaluate the HPV presence in normal oral mucosa of asymptomatic subjects and; in parallel, to correlate social behavioral habits with the virus. MATERIALS AND METHODS: Contemporary cohort cross-sectional study. The HPV was found by PCR, using general primers MY09/11 in 125 oral mucosa samples submitted to DNA extraction and PCR to search for the beta-globin gene in order to assess the quality of the extracted DNA. In parallel, we carried out a study of behavioral issues associated with the patients. RESULTS: All the samples had a positive diagnosis of the beta-hemoglobin gene. HPV was diagnosed in 23.2% of the samples analyzed. CONCLUSION: The virus was present in 29 of the 125 patients, without them having any clinical-pathological manifestation associated with the HPV. As to the social behavior of the patients, we concluded that oral sex is statistically correlated to the virus, and besides the HPV has been statistically more present in female patients.

Absolute quantification of gene E7 in cervical samples of women infected by HPV using real time PCR

Objective: High grade oncogenic types of human papillomavirus (HPV), especially HPV16 and HPV18, possess a gene called E7, which acts on genes that regulate cell growth, promoting development of pre-neoplastic lesions that can lead to invasive carcinomas. The absolute quantification of this gene in cervical samples of HPV-infected women may contribute for better understanding the evolution of these lesions induced by the virus. Methods: We collected 60 cervicovaginal smears of women infected by HPV with or without uterine cervical squamous intraepithelial lesion, SIL) and 10 samples of women with no HPV infection or SIL. The absolute quantification of gene E7 was performed by Realtime PCR using specific primers and probes. Results: Samples infected by HPV16 have a higher number of gene E7 copies when compared to samples infected by HPV18. In the HPV18 group it was observed that those obtained from patients with low or high grade squamous intraepithelial lesions (HSIL) or invasive cervical cancer presented significantly higher concentrations of gene E7 when compared to patients with no cervical lesions. The number of gene E7 copies was higher in the group infected by HPV16 than by HPV18. In spite of that, there was no difference in the number of gene E7 copies in samples infected by HPV16 with or without SIL. Conclusions: Among the samples with HPV18, the number of copies of gene E7 was higher in the group with cervical lesions, and no differences were found for SIL, HSIL or invasive cancer patients.