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Metalloproteinases in corneal diseases: degradation and processing
1Division of Ophthalmology, Department of Visual Sciences, Nihon University School of Medicine, Tokyo, Japan. torusaki@gmail.com
Cornea
|October 6, 2012
Summary
Matrix metalloproteinases (MMPs) and ADAMs are upregulated in corneal diseases. These enzymes contribute to corneal pathophysiology by degrading extracellular matrix and shedding cytokine receptors, driving inflammation.
Area of Science:
- Ophthalmology
- Molecular Biology
- Biochemistry
Background:
- Matrix metalloproteinases (MMPs) degrade extracellular matrix.
- ADAMs (a disintegrin and metalloproteinase) mediate ectodomain shedding.
- Corneal diseases involve extracellular matrix degradation and inflammation.
Purpose of the Study:
- Investigate MMP expression in corneal diseases.
- Determine the role of ADAMs in corneal pathophysiology.
- Elucidate mechanisms of inflammation in corneal diseases.
Main Methods:
- Analyzed tear fluid from patients with corneal diseases.
- Utilized human corneal epithelial cells and fibroblasts.
- Measured MMP-2, MMP-9, ADAM17 activity, and IL-6 signaling pathways.
Main Results:
- Upregulated active MMP-2 and MMP-9 in tear fluid from patients with corneal melting or recurrent corneal erosion.
- ADAM17-dependent shedding of soluble tumor necrosis factor receptor 1 and soluble IL-6 receptor (sIL-6R) in corneal epithelial cells.
- IL-6/sIL-6R trans-signaling induced inflammatory signaling (STAT3 phosphorylation) in corneal fibroblasts.
Conclusions:
- MMPs are significantly upregulated in collagen-destructive corneal disorders.
- ADAM-mediated ectodomain shedding contributes to soluble cytokine receptor production.
- IL-6 trans-signaling plays a significant role in ocular surface inflammation, highlighting MMPs and ADAMs in corneal disease pathophysiology.
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