HPV 16 detection in cervical lesions, physical state of viral DNA and changes in p53 gene
São Paulo med. j
;
121(2): 67-71, Mar. 3, 2003. ilus, tab
Artículo
en Inglés
| LILACS
| ID: lil-342145
RESUMO
CONTEXT: Persistent infection with high risk human papillomavirus (HPV) has been linked to cervical carcinoma. Integration of viral DNA into host cell DNA is essential for this cancer development, promoting disruption of the HPV E2 gene, thus leading to unregulated increases in E6 and E7 proteins and inactivating the products of p53 and Rb tumor suppressor genes. OBJECTIVE: To investigate HPV 16 infection in cervical lesions, physical state of viral DNA and p53 gene alterations in a group of women attending a public health service. DESIGN: Prospective, non-controlled, transversal study. SETTING: Gynecological clinic of the School od Medicine, Universidade Federal Fluminense. SAMPLE: 43 consective patients with cervical lesions referred to our service. MAIN MEASUREMENTS: Cases were classified via cytology/histology as normal, HPV infection, condyloma, low-grade squamous intraepithelial lesion (LSIL), high-grade squamous intraepithelial lesion (HSIL) and carcinoma. HPV infection was studied via polymerase chain reaction (PCR) using two PCR primer sets, to determine DNA integration. p53 gene changes were investigated by single-strand conformation polymorphism (SSCP) analysis. RESULTS: One normal case, 7 HPV infections, 6 condylomas, 7 LSIL, 14 HSIL and 8 cancers were found, with 95 percent positive for HPV genome when tested using both L1 and E6 primers. HPV 16 was most prevalent (73.1 percent). HPV 16 DNA was integrated within the host genome in 3 LSIL. One LSIL progressed to HSIL by 13 months after first diagnosis. Among HPV 16-positive HSIL cases, 50 percent contained integrated viral DNA. HPV 16 E2 gene disruption was seen in 7 cancers (87.5 percent). Only smal-cell carcinoma showed intact HPV 16 E2 gene. Abnormal p53 bands detected by PCR/SSCP were observed in 4 cases: 2 squamous carcinoma with parametrium (exon 8) and two cervical intraepithelial neoplasia (CIN) III (exons 5 and 7). All cases presented HPV 16 E2 gene loss. CONCLUSIONS: The sample had a high rate of high-risk HPV detected in benign and malignant lesions; high cervical cancer burden; HPV 16 DNA integration in all except one case of cancer; p53 gene changes in CIN III and in invasive cancer cases associated with DNA integration
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Índice:
LILACS (Américas)
Asunto principal:
Papillomaviridae
/
Infecciones Tumorales por Virus
/
ADN Viral
/
Proteínas Oncogénicas Virales
/
Genes p53
/
Infecciones por Papillomavirus
Tipo de estudio:
Estudio diagnóstico
/
Estudio observacional
/
Estudio de prevalencia
/
Factores de riesgo
Límite:
Adolescente
/
Adulto
/
Femenino
/
Humanos
Idioma:
Inglés
Revista:
São Paulo med. j
Asunto de la revista:
Cirurgia Geral
/
Cincia
/
Ginecologia
/
Medicina
/
Medicina Interna
/
Obstetr¡cia
/
Pediatria
/
Sa£de Mental
/
Sa£de P£blica
Año:
2003
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Brasil
Institución/País de afiliación:
Universidade Federal Fluminense/BR
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