Equine laminitis: increased transcription of matrix metalloproteinase-2 (MMP-2) occurs during the developmental phase.

The research conducted sought to understand the role of lamellar metalloproteinase-2 (MMP-2) in the development of equine laminitis, a debilitating condition affecting horse hooves. Findings indicate that MMP-2 transcription increases during the developmental phase of laminitis, suggesting that this process may contribute to the disease progression and could potentially be used for diagnostic and preventative strategies.

Research Methodology

• The research began with the isolation of total RNA which was later fragmented by RT-PCR, cloned into a vector, and sequenced. This was to clone and sequence the cDNA encoding lamellar MMP-2.
• Rabbit anti-equine MMP-2 and labelled MMP-2 riboprobe were developed. These would serve as tools to analyze and quantify the expression of MMP-2 in equine hoof tissue.
• The detection of MMP-2 in the hoof tissues was achieved through Western immunoblotting with anti-MMP-2, and the results confirmed the protein’s existence and cross-reactivity with human MMP-2.
• The researchers employed immunohistochemistry and in situ hybridisation as techniques to localise MMP-2 within the equine hoof tissue. They found MMP-2 in the cytoplasm of basal and parabasal cells in close proximity to the lamellar basement membrane.

Results and Conclusions

• The analysis of normal and laminitis-affected tissues using Northern analysis and quantitative real-time PCR demonstrated significantly elevated expression of MMP-2 in laminitis-affected tissues. This implied that the pathology of laminitis correlates with increased transcription of MMP-2.
• Real-time PCR analysis of lamellar MMP-2 has potential diagnostic value and may facilitate the monitoring of laminitis development at the molecular level. This knowledge could be useful in devising preventive strategies against the disease.
• The study concluded that controlling the increased MMP-2 transcription may help to avoid or mitigate laminitis in high-risk clinical situations. This conclusion also served as a warning to clinicians that the basement membrane lesion of laminitis is insidious and progresses well before clinical signs are apparent.