Equine Hoof Canker: Bovine Papillomavirus Infection Is Not Associated With Impaired Keratinocyte Differentiation.

The research examines the relationship between bovine papillomavirus (BPV) infection and the occurrence of equine hoof canker, a painful horse foot disease, determining that there is no direct link.

Investigating the Link between Bovine Papillomavirus and Equine Hoof Canker

• The study was designed to explore the possible connection between BPV infection and equine hoof canker, a disease causing damage to horse hooves.
• This interest was inspired by suggestive evidence in prior studies, which pointed out the presence of koilocytotic keratinocytes, a typical cell alteration in hoof canker, and simultaneous BPV-1/2 detection in equine canker patients.
• Thus, aiming to establish or refute a link between BPV infection and the development of equine hoof canker, the researchers evaluated the frequency and severity of koilocytotic keratinocytes along with the detection rate of BPV in hoof canker samples.

Results of the Study

• In the collected samples, 5 of the 18 canker-affected horses and 2 of the 6 control horses tested positive for BPV-1/2 DNA.
• However, the researchers found no association between the presence of BPV-1/2 papillomaviral DNA and the koilocytotic appearance of keratinocytes.
• This essentially refutes the previous belief that BPV infection is a primary causative factor in the development of equine hoof canker.
• As such, the original hypothesis of the study, based on the commonality of BPV and hoof canker, was disproved by the findings.

Additional Discoveries

• Apart from the core investigation, the researchers performed additional tests studying proteins associated with but not specific to PV infection.
• They applied immunohistochemistry to document particular adhesion molecules and intermediate filaments, which are crucial for keratinocyte differentiation and the epidermal barrier function in both control and canker tissue samples.
• These studies revealed altered expression patterns of intermediate filaments and adhesion molecules in canker tissues, signifying the potential importance of incomplete keratinocyte differentiation in the progression of equine hoof canker, confirming the secondary aim of the study – the importance of the keratinocyte differentiation process in the disease.