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Membrane type-1 matrix metalloproteinase in human ocular tissues
1Department of Ophthalmology, Case Western Reserve University, Cleveland, OH 44106-5068, USA.
Purpose:
Membrane type-1 matrix metalloproteinase (MT1-MMP) (MMP-14) (EC 3.4.24.xx) is involved in the activation of progelatinase A (MMP-2) (EC 3.4.24.24). MMP-2 is present at least in the interphotoreceptor matrix and vitreous. The purpose of this study was to determine the distribution of MT1-MMP, and MMP-2, in human ocular tissues.
Methods:
The distribution of MT1-MMP and MMP-2 was investigated in vitreous and in membrane extracts from eye tissues obtained from postmortem human eyebank eyes. Western blot analysis was performed using mouse monoclonal anti-MT1-MMP and anti-MMP-2 antibodies.
Results:
MT1-MMP was found in sclera, cornea, lens, choroid, retinal pigment epithelium (RPE) and retina. MMP-2 was found in sclera, cornea, choroid, vitreous, RPE and retina but was absent from lens.
Conclusion:
We provide the first evidence for the presence and distribution of membrane-type-1 matrix metalloproteinase in human ocular tissues. MT1-MMP may be responsible for the activation of progelatinase A in many ocular extracellular matrices in a manner similar to that exhibited in other systems.
Insights
This study found membrane type-1 matrix metalloproteinase (MT1-MMP) in human ocular tissues. MT1-MMP and matrix metalloproteinase-2 (MMP-2) are distributed throughout the eye, suggesting roles in extracellular matrix remodeling.
Area of Science:
- Ocular biology
- Biochemistry
- Extracellular matrix research
Background:
- Matrix metalloproteinases (MMPs) are crucial for extracellular matrix remodeling.
- Membrane type-1 matrix metalloproteinase (MT1-MMP) activates progelatinase A (MMP-2).
- MMP-2 is found in the interphotoreceptor matrix and vitreous.
Purpose of the Study:
- To investigate the distribution of MT1-MMP and MMP-2 in human ocular tissues.
- To understand the potential role of MT1-MMP in ocular matrix remodeling.
Main Methods:
- Western blot analysis was used to detect MT1-MMP and MMP-2.
- Human eyebank eyes were used for tissue and vitreous membrane extraction.
- Specific monoclonal antibodies against MT1-MMP and MMP-2 were employed.
Main Results:
- MT1-MMP was detected in the sclera, cornea, lens, choroid, retinal pigment epithelium (RPE), and retina.
- MMP-2 was found in the sclera, cornea, choroid, vitreous, RPE, and retina.
- MMP-2 was notably absent from the lens.
Conclusions:
- This research provides the first evidence of MT1-MMP presence in human ocular tissues.
- MT1-MMP likely activates progelatinase A within various ocular extracellular matrices.
- The findings suggest MT1-MMP plays a significant role in ocular tissue structure and function.