Expression of platelet-derived growth factor-beta receptor and bovine papillomavirus E5 and E7 oncoproteins in equine sarcoid.
Equine sarcoids are benign fibroblastic skin tumours that are recognized throughout the world. Infection with bovine papillomavirus (BPV) types 1 and 2 has been implicated as a major factor in disease development; however, the cellular mechanisms underlying fibroblast transformation remain poorly defined. The present study further characterizes aspects of the association with BPV in 15 equine sarcoids. BPV DNA was demonstrated in 12/15 tumours collected from different areas of Italy. Nine of these 12 tumours expressed the BPV oncoproteins E5 and E7, but these oncoproteins were not expressed by normal equine cells. The BPV E5 protein is known to bind to the platelet-derived growth factor-beta receptor (PDGF-betaR) and this molecule was expressed by 11 of the 12 sarcoids in which E5 was demonstrated. These findings add further weight to the theory that BPV and the PDGF-betaR may have a role in the pathogenesis of this disease.
Borzacchiello
G
G
Department of Pathology and Animal Health, Faculty of Veterinary Medicine, Naples University "Federico II", Via F. Delpino 1, 80137 Naples. borzacch@unina.it
Russo
V
V
Della Salda
L
L
Roperto
S
S
Roperto
F
F
D000818:Animals; D015153:Blotting, Western; D004279:DNA, Viral / Q000032:analysis; D005260:Female; D005455:Fluorescent Antibody Technique; D006734:Horse Diseases / Q000821:virology*; D006736:Horses; D007150:Immunohistochemistry; D008297:Male; D018613:Microscopy, Confocal; D009856:Oncogene Proteins, Viral / Q000096:biosynthesis*; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000096:biosynthesis*; D012878:Skin Neoplasms / Q000378:metabolism / Q000662:veterinary* / Q000821:virology
D004279:DNA, Viral; D009856:Oncogene Proteins, Viral; C054304:oncogene protein E5, Bovine papillomavirus type 1; C075621:oncogene protein E7, Bovine papillomavirus type 1; D020797:Receptor, Platelet-Derived Growth Factor beta