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Repressed Wnt Signaling Accelerates the Aging Process in Mouse Eyes
Yujin Zhang1, Joseph Jeffrey2, Fei Dong2
1School of Optometry, Indiana University, 800 East Atwater Avenue, Bloomington, IN 47405, USA.
Journal of Ophthalmology
|July 19, 2019
Summary
Repressing Wnt signaling with secreted frizzled-related protein 1 (sFRP1) accelerates ocular aging in mice. This study observed age-related changes in the eye, mimicking pseudoexfoliation syndrome.
Area of Science:
- Ophthalmology
- Molecular Biology
- Gerontology
Background:
- Ocular aging leads to vision decline and age-related diseases like cataracts and glaucoma.
- Previous research indicated repressed Wnt signaling accelerates corneal epithelium development.
Purpose of the Study:
- To investigate if repressed Wnt signaling accelerates aging in mouse eyes.
- To explore the role of secreted frizzled-related protein 1 (sFRP1) in ocular aging.
Main Methods:
- Engineered a bitransgenic system to express sFRP1 in mouse corneal stroma.
- Analyzed ocular tissue structure for signs of aging.
- Conducted signal transduction analysis to understand cellular responses to sFRP1.
Main Results:
- sFRP1 expression induced accelerated aging signs in mouse eyes, resembling pseudoexfoliation syndrome.
- Observed granular deposits on the lens capsule, iris pigment loss, fibrillary material in the anterior chamber, and corneal endothelial cell polymegethism/pleomorphism.
- In vitro studies showed sFRP1 did not inhibit Wnt5a, with similar cellular responses to both.
Conclusions:
- sFRP1 expression accelerates ocular aging in a mouse model.
- Further research is needed to fully understand the mechanisms driving sFRP1-induced ocular aging.
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