Bovine papillomavirus type 4 L1 gene transfection in a Drosophila S2 cell expression system: absence of L1 protein expression

The development of a bovine papillomavirus (BPV) vaccine is an outstanding challenge. BPV protein L1 gene transfection in the Drosophila melanogaster S2 cell expression system failed to produce L1 protein notwithstanding correct L1 gene insertion. Severe genetic inbalance in the host cell line, including cytogenetic alterations, may account for the lack of protein expression.

O desenvolvimento de uma vacina para papilomavirus bovino (BPV) consiste em grande desafio. A transfecção do gene codificante da proteína L1 de BPV em sistema de células S2 de Drosophila melanogaster não logrou sucesso, apesar da correta inserção da seqüência gênica em vetor apropriado.Graves alterações genéticas na linhagem celular S2, que incluem aberrações cromossômicas, provavelmente estão relacionadas à ausência da expressão da proteína desejada.

P 53 as an indicator for severity of human papilloma viral infection and cervical neoplasia

The tumor suppressor gene p53, located on the short arm of chromosome 17, encodes for a nuclear protein which regulates cell proliferation. Functional disturbance of p53 contributes to uncontrolled cell growth and alleges to be the commonest genetic abnormality in human cancer. Human papilloma virus [HPV] E[6] oncoproteins bind to wild type p53 and disturb its function. Our objective was to compare p53 expression in HPV genital warts and cervical neoplasia. [Cervical intraepithelial neoplasia and cancer cervix]. 45 women were selected from gynecological and Dermatology and Venerology Departments of Tanta University Hospital. They were divided according to their lesions into 15 women with anogenital warts and 15 patients with cervical intraepithelial neoplasia [CIN] and 15 cases with squamous cell carcinoma of the cervix at stage II and III. Based on the affected area skin or cervical biopsies were taken from every patient. Polymerase Chain Reaction [PCR] for HPV 16 DNA, histopathology and Immunohistochemical studies were performed to each biopsy. It was observed that the positive rate for HPV-16 DNA was higher in cases with cervical cancer than those of CIN and genital warts groups. Also, among cases with different stages of cancer cervix it was found that the positivity for HPV-16 DNA was more in cases with stage III compared to those with stage II. As regards to p53 immunostaining results, both nuclear and cytoplasmic keratinocyte were detected more in cases with cancer cervix [89%] than those with CIN [73%] and genital wart [53%]. According the obtained results, we can conclude that the existence of mutant p53 oncogene expression in HPV-16 DNA positive genital lesions is associated with a higher risk of developing malignancy. Moreover, its pattern of expression might be a predictor for the future behavior of the neoplasm