E7 oncoprotein of novel human papillomavirus type 108 lacking the E6 gene induces dysplasia in organotypic keratinocyte cultures.
The genome organization of the novel human papillomavirus type 108 (HPV108), isolated from a low-grade cervical lesion, deviates from those of other HPVs in lacking an E6 gene. The three related HPV types HPV103, HPV108, and HPV101 were isolated from cervicovaginal cells taken from normal genital mucosa (HPV103) and low-grade (HPV108) and high-grade cervical (HPV101) intraepithelial neoplasia (Z. Chen, M. Schiffman, R. Herrero, R. DeSalle, and R. D. Burk, Virology 360:447-453, 2007, and this report). Their unusual genome organization, against the background of considerable phylogenetic distance from the other HPV types usually associated with lesions of the genital tract, prompted us to investigate whether HPV108 E7 per se is sufficient to induce the above-mentioned clinical lesions. Expression of HPV108 E7 in organotypic keratinocyte cultures increases proliferation and apoptosis, focal nuclear polymorphism, and polychromasia. This is associated with irregular intra- and extracellular lipid accumulation and loss of the epithelial barrier. These alterations are linked to HPV108 E7 binding to pRb and inducing its decrease, an increase in PCNA expression, and BrdU incorporation, as well as increased p53 and p21(CIP1) protein levels. A delay in keratin K10 expression, increased expression of keratins K14 and K16, and loss of the corneal proteins involucrin and loricrin have also been noted. These modifications are suggestive of infection by a high-risk papillomavirus.
Nobre
Rui Jorge
RJ
Division for the Characterization of Tumorviruses, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany.
Herráez-Hernández
Elsa
E
Fei
Jian-Wei
JW
Langbein
Lutz
L
Kaden
Sylvia
S
Gröne
Hermann-Josef
HJ
de Villiers
Ethel-Michele
EM
D000328:Adult; D017209:Apoptosis; D049109:Cell Proliferation; D002471:Cell Transformation, Neoplastic; D004279:DNA, Viral / Q000235:genetics; D005260:Female; D016679:Genome, Viral; D006801:Humans; D015603:Keratinocytes / Q000821:virology*; D050356:Lipid Metabolism; D027383:Papillomaviridae / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D050725:Papillomavirus E7 Proteins / Q000096:biosynthesis* / Q000235:genetics; D030361:Papillomavirus Infections / Q000821:virology; D014481:United States; D002583:Uterine Cervical Neoplasms / Q000821:virology
D004279:DNA, Viral; D050725:Papillomavirus E7 Proteins