Equine laminitis: membrane type matrix metalloproteinase-1 (MMP-14) is involved in acute phase onset.

This research article discovers that a specific enzyme called Matrix Metalloproteinase-14 (MMP-14) plays a crucial role in the early onset of equine laminitis, a debilitating condition affecting a horse’s hoof. The study cloned and sequenced the enzymes and their inhibitors, finding that they are dramatically altered in laminitic tissue compared to normal tissue.

Objective and Methods

• The objective of this research was to clone and sequence the cDNA encoding lamellar MMP-14 and TIMP-2, key enzymes and their inhibitors found in the tissues of horse hooves. The researchers sought to quantify their transcription in both normal and laminitic (a disease affecting horses) tissue.
• To achieve this, tissue samples were sourced from a model of laminitis induced by oligofructose. RNA was isolated from these samples, amplified through RT-PCR, cloned, and then sequenced.
• Real-time PCR was utilized to quantify the expression levels of both MMP-14 and TIMP-2. To study the location of MMP-14 within hoof tissues, an antibody was developed against equine MMP-14.

Findings

• Using a method called immunohistochemistry, the researchers were able to locate MMP-14 in normal tissue samples within the cytoplasm of cells near the lamellar basement membrane.
• In tissues affected by laminitis, the amount of MMP-14 detected was significantly reduced.
• Through quantitative real-time PCR, it was found that the transcription of MMP-14 was significantly elevated in laminitic tissues, where the transcription of TIMP-2 was lowered.

Conclusions

• Through this research, it was concluded that MMP-14, typically found in the cytoplasm, disintegrates during the development of laminitis.
• The pathology of this disease was found to be connected with increased transcription of MMP-14 and decreased transcription of TIMP-2.
• The study suggests that enzymes are deeply involved in the pathology of laminitis and that inhibiting their activity could be beneficial in preventing the onset of this debilitating condition.