Correlation between Inactive Cathepsin D Expression and Retinal Changes in mcd2 / mcd2 Transgenic Mice
Abstract
PURPOSE: To investigate the correlation between the presence of the inactive cathepsin D (CatD) and retinal changes in mcd2/mcd2 transgenic mice. METHODS: Computational modeling was used to examine whether CatD mutants maintain competitive substrate binding. D407 cells were transfected with pcDNACatDM1 or pcDNACatDM2, containing procathepsin D (pro-CatD) with 6-bp (CatDM1) or 12-bp (CatDM2) deletions, respectively, flanking the pro-CatD cleavage site, and the aspartic protease activity of the transfected cells was measured. Subsequently, transgenic mice (mcd2/mcd2) containing CatDM2 were generated. Relative transgene copy number and transcript levels in the previously produced mcd/mcd (carrying CatDM1) and mcd2/mcd2 mice were measured by quantitative real-time PCR. Western blot analysis and aspartic protease activity were used to characterize the mutated proteins. Retinal changes were described by using color fundus photography and fluorescein angiography, histology, immunohistochemistry, and electron microscopy. RESULTS: Computational modeling of the CatDM1 and CatDM2 structures indicated that the substrate binding site was not altered. There was limited or no aspartic protease activity associated with CatDM1 and CatDM2 proteins, respectively. Mcd2/mcd2 animals contained a higher amount of inactive CatD than mcd/mcd or wild-type mice. Retinal abnormalities in mcd2/mcd2 mice developed at 3 months of age, earlier than in mcd/mcd mice. These changes included hypopigmentation, hyperfluorescence, retinal pigment epithelial (RPE) cell depigmentation or clumping, cell proliferation, and pleomorphism. Proliferating cells were identified as being of RPE origin. CONCLUSIONS: This study demonstrated a correlation between the presence of the inactive CatD in RPE cells and the development of ophthalmoscopic, cellular, and histologic changes in the retina.
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Tight junctions and basal polarity of the RPE nucleus was lost in the mcd2/mcd2 mice.
“Tight junctions and basal polarity of the RPE nucleus was lost in the mcd2/mcd2 mice (Zhang et al., 2005).”
From Retinal ultrastructure of murine models of dry age-related macular degeneration (AMD) (2010) · cites this paper as Zhang et al., 2005
Three month-old mcd2/mcd2 mice showed focal areas of RPE disorganization, clumping, proliferation, and pleomorphism with attenuation, depigmentation, and atrophy.
“Three month-old mcd2/mcd2 mice showed focal areas of RPE disorganization, clumping, proliferation, and pleomorphism with attenuation, depigmentation, and atrophy.”
From Retinal ultrastructure of murine models of dry age-related macular degeneration (AMD) (2010) · cites this paper as Zhang et al., 2005
By 12 months old, almost all mcd2/mcd2 animals developed RPE proliferation.
“These early findings progressed with age, and by 12 months old almost all the animals developed RPE proliferation.”
From Retinal ultrastructure of murine models of dry age-related macular degeneration (AMD) (2010) · cites this paper as Zhang et al., 2005
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- Authors
- Zhang, D., Brankov, M., Makhija, M. T., Robertson, T., Helmerhorst, E., Papadimitriou, J. M., & Rakoczy, P. E.
- Affiliations
- Lions Eye Institute (AU)
- Curtin University (AU)
- Department of Pathology and
- ORCID
- Zhang, Dan
- Venue
- Investigative Opthalmology & Visual Science
- Published
- 2005-09-01
- Volume
- 46
- Issue
- 9
- Pages
- 3031
- ISSN
- 0146-0404 (ISSN-L)
- 1552-5783
- OpenAlex
- W2043851993
- Cited by
- 23
- References
- 43
- Citations by year
- 2026: 1 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 1 · 2015: 2 · 2014: 2 · 2013: 3 · 2012: 2
- FWCI
- 0.75
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Investigative Ophthalmology & Visual Science (publishedVersion, public-domain)
- PubMed (publishedVersion)
- UWA Profiles and Research Repository (UWA) (submittedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
- Health Sciences › Medicine › Ophthalmology › Retinal Diseases and Treatments
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
- Keywords
- retinal changes, retinal pigment epithelium, substrate binding site, retinal degeneration
- MeSH terms
- Animals, Cathepsin D, Computer Simulation, Enzyme Precursors, Fluorescein Angiography, Humans, Immunohistochemistry, Macular Degeneration, Mice, Inbred C57BL, Mice, Transgenic, Pigment Epithelium of Eye, Transfection, Blotting, Western, Molecular Structure, Aspartic Acid Endopeptidases, Gene Deletion, Reverse Transcriptase Polymerase Chain Reaction, Mice
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