Localisation of gelatinase activity in epidermal hoof lamellae by in situ zymography.

This research uses a technique known as in situ gelatin zymography to identify and locate the activity of specific enzymes in horse hooves. These enzymes (gelatinases) play a role in a disease known as laminitis. By studying where the gelatinases are produced in the hoof, the team discovered more about the onset and progression of this disease.

Understanding In-Situ Gelatin Zymography

• In situ gelatin zymography is a method that uses a gelatin-based overlay to detect and locate the activity of gelatinase enzymes within tissue. This technique offers a visual representation of enzyme activity, enabling researchers to pinpoint the exact location of specified enzymes within the examined tissue.

Gelatinases and Their Significance

• Gelatinase A, also known as matrix metalloproteinase-2 (MMP-2), and Gelatinase B, or matrix metalloproteinase-9 (MMP-9), are enzymes found in horse hooves. Typically, these enzymes originate from the matrix and epithelia, rather than other potential sources such as white blood cells (leucocytes).
• In this study, the gelatinases were identified within specific structures of the equine hoof called the epidermal hoof lamellae. More importantly, the enzymes were found to be produced by specific cells within this structure, namely the basal and/or parabasal cells.

Connection to Laminitis

• The pattern of gelatinase expression observed in this study aligns with the progression of pathological changes seen during the onset of laminitis. Laminitis is a debilitating and painful condition in horses that affects the hooves.
• This correlation provides further evidence that the pathology of laminitis could result from inadequate regulation of MMP within the area. This suggests that local MMP regulation could be a critical target for alleviating the onset and progression of this disease.