Metalloproteinases in canine experimental traumatic keratoconjunctivitis

Area of Science:

• Ophthalmology
• Veterinary Medicine
• Biochemistry

Background:

• Matrix metalloproteinases (MMPs) are implicated in various ocular diseases.
• MMPs, including MMP-9 (gelatinase-B), may be present and active in tear fluid.
• Understanding MMP activity is crucial for diagnosing and managing canine eye conditions.

Purpose of the Study:

• To investigate the presence and activity of MMPs in the tears of dogs with keratoconjunctivitis.
• To determine if MMP-9 levels correlate with the severity of canine eye disease.
• To assess the potential of MMPs as biomarkers for corneal deterioration.

Main Methods:

• Tear samples were collected from dogs diagnosed with keratoconjunctivitis and healthy controls.
• Gelatine zymography was employed to measure overall MMP activity.
• Gelatine degradation ELISA was used to quantify active gelatinase levels, specifically MMP-9.

Main Results:

• Elevated monomer and dimer enzyme activity of MMP-9 was observed in tears from keratoconjunctivitis cases compared to normal tears (P < 0.001).
• Gelatinase bioactivities were significantly increased in tears associated with keratoconjunctivitis disease (P < 0.01).
• The presence of biologically active MMP forms indicates their direct involvement in the disease process.

Conclusions:

• Matrix metalloproteinases, particularly MMP-9, are significantly elevated and biologically active in the tears of dogs with keratoconjunctivitis.
• These findings highlight the potential role of MMPs as important indicators of corneal deterioration in canine eye diseases.
• Further research into MMPs could lead to improved diagnostic tools and therapeutic strategies for veterinary ophthalmology.