Bovine papillomavirus E7 oncoprotein binds to p600 in naturally occurring equine sarcoids.
Studies regarding the functions of the bovine papillomavirus (BPV) E7 oncoprotein in vivo are lacking and no E7-mediated mechanism underlying mesenchymal carcinogenesis is known. Here, we show that the interaction between the 600 kDa retinoblastoma protein-associated factor (p600) and BPV E7, described in vitro in cultured cells, takes place in vivo in naturally occurring equine sarcoids. In these cancers we detect the expression of E7 and p600, and demonstrate that E7 and p600 co-localize and physically interact. Furthermore, intracellular signals involved in p600 functional activity are found not to be overexpressed, suggesting a different functional activity of p600 in naturally occurring carcinogenesis. Our results demonstrate, for the first time, that E7-p600 interaction occurs during the natural history of BPV-induced equine tumours, suggesting an important role for E7 in carcinogenesis. Finally, the system provides a suitable animal model of papillomavirus-associated cancer to test therapeutic vaccination against E7.
Department of Pathology and Animal Health, Faculty of Veterinary Medicine, University of Naples Federico II, Via Veterinaria 1, 80137 Naples, Italy.
Annunziata
A
Corteggio
Ornella
O
Di Geronimo
Sante
S
Roperto
Franco
F
Roperto
Giuseppe
G
Borzacchiello
D000818:Animals; D052687:Deltapapillomavirus; D006734:Horse Diseases / Q000276:immunology / Q000821:virology*; D006736:Horses; D009856:Oncogene Proteins, Viral / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D012878:Skin Neoplasms / Q000276:immunology / Q000662:veterinary* / Q000821:virology
D009856:Oncogene Proteins, Viral