Thermolysin activates equine lamellar hoof matrix metalloproteinases.

The researchers conducted studies on horse hoof cells and found that the bacterial enzyme thermolysin can activate certain proteins, leading to conditions similar to hoof disease laminitis. They also discovered that the thermolysin activation was not blocked by a certain inhibitor, indicating that similar bacterial enzymes may facilitate bacterial invasion of the host organism.

Objectives and Purpose of the Study

• The purpose of the study was to investigate the effects of thermolysin, a bacterial enzyme, on the activation of two types of proteins called matrix metalloproteinase-2 (MMP-2) and MMP-9 within the cells of horse hooves.
• The researchers aimed to uncover the potential role of bacteria in inducing conditions similar to laminitis, a common hoof disease in horses, by producing enzymes that activate these proteins.

Methods and Experimentation

• Horse hoof cells were grown in a controlled environment and were subjected to the enzyme thermolysin.
• The effects of thermolysin on both the structure of the hoof cells (as measured by the integrity of the dermal-epidermal junction) and the activation of MMP-2 and MMP-9 were observed and measured.
• The researchers also tested the effects of batimastat, an inhibitor of MMPs, on thermolysin’s activation of the proteins.

Results and Findings

• The results showed that exposure to thermolysin resulted in the separation of the hoof cells at the dermal-epidermal junction, which is an event commonly associated with the hoof disease laminitis.
• In addition, the researchers found that thermolysin also triggered the activation of MMP-2 and MMP-9.
• Interestingly, the application of batimastat did not block thermolysin’s activation of these proteins, suggesting that the enzyme’s mechanism of action may be independent of the usually targeted pathways of the inhibitor.

Significance and Implications

• The findings suggest that bacteria could contribute to the development of hoof diseases such as laminitis by producing enzymes like thermolysin that activate destructive proteins within the horse’s hoof cells.
• The fact that batimastat, an MMP inhibitor, did not stop thermolysin’s effect implies that bacteria could potentially render some preventive or therapeutic strategies ineffective.
• This study forms the basis for further understanding on how bacterial enzymes might influence the onset of laminitis and calls for more in-depth research in developing effective strategies to counter these bacteria or their enzymes.