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Updated: Aug 18, 2026
Quantification of Vascular Parameters in Whole Mount Retinas of Mice with Non-Proliferative and Proliferative Retinopathies
Published on: March 12, 2022
Retinal vascular development and pathologic retinal angiogenesis are not impaired in matrix metalloproteinase-2
Sylvia Sarman1, Ingeborg van der Ploeg, Stefan Seregard
1Department of Clinical Neuroscience, St. Erik's Eye Hospital, SE-112 82 Stockholm, Sweden.
Purpose:
Earlier studies have suggested a role for metalloproteinase-2 (MMP-2) in retinal angiogenesis. To investigate this further, we have studied retinal vascular development and pathologic ischemia-induced retinal angiogenesis in MMP-2-deficient and wild-type mice.
Methods:
Vascular development of the retina was studied in retinal flatmounts, whereas pathologic retinal angiogenesis was analyzed in retinal flatmounts and on histologic sections using a model of ischemia-induced retinopathy. The time course of MMP-2 mRNA expression was determined by in situ hybridization and real-time polymerase chain reaction (PCR).
Results:
Formation of the retinal vascular plexus was not significantly different in MMP-2-deficient mice as compared to wild-type mice. In ischemia-induced retinopathy, there was an increased formation of extraretinal neovascular tufts in the MMP-2-deficient mice (p < 0.05). MMP-2 mRNA expression did not correlate to either retinal vascular development or to ischemia-induced formation of extraretinal vascular tufts.
Conclusions:
The current data suggest that MMP-2 is not essential for either retinal vascular development or pathologic retinal neovascularization in the mouse.
Insights
Metalloproteinase-2 (MMP-2) is not essential for normal retinal vascular development or pathological neovascularization. MMP-2 deficient mice showed increased neovascular tufts in an ischemia model, suggesting a complex role.
Area of Science:
- Ophthalmology
- Molecular Biology
- Vascular Biology
Background:
- Metalloproteinase-2 (MMP-2) has been implicated in angiogenesis.
- The precise role of MMP-2 in retinal angiogenesis requires further investigation.
Purpose of the Study:
- To investigate the role of MMP-2 in retinal vascular development.
- To examine the role of MMP-2 in ischemia-induced retinal angiogenesis using MMP-2-deficient mice.
Main Methods:
- Retinal vascular development was assessed in retinal flatmounts.
- Ischemia-induced retinopathy was analyzed in flatmounts and histologic sections.
- MMP-2 mRNA expression was quantified using in situ hybridization and real-time PCR.
Main Results:
- No significant difference in retinal vascular plexus formation was observed between MMP-2-deficient and wild-type mice.
- MMP-2-deficient mice exhibited increased extraretinal neovascular tufts in an ischemia-induced retinopathy model (p < 0.05).
- MMP-2 mRNA expression levels did not correlate with retinal vascular development or ischemia-induced neovascularization.
Conclusions:
- MMP-2 is not essential for normal retinal vascular development in mice.
- MMP-2 is not essential for pathological retinal neovascularization in the studied mouse model.
- The findings suggest a non-essential role for MMP-2 in these retinal processes.
