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Related Experiment Videos

Correlation between inactive cathepsin D expression and retinal changes in mcd2/mcd2 transgenic mice.

Dan Zhang1, Meliha Brankov, Mahindra T Makhija

  • 1Department of Molecular Ophthalmology, Lions Eye Institute, Perth, Australia.

Investigative Ophthalmology & Visual Science
|August 27, 2005
PubMed
Summary

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Inactive cathepsin D (CatD) in retinal pigment epithelial cells correlates with retinal changes in transgenic mice. This suggests a link between CatD dysfunction and retinal disease development.

Area of Science:

  • Ophthalmology
  • Molecular Biology
  • Genetics

Background:

  • Cathepsin D (CatD) is an aspartic protease involved in cellular degradation.
  • Mutations in CatD can lead to inactive forms of the enzyme.
  • Understanding CatD's role in retinal health is crucial for identifying disease mechanisms.

Purpose of the Study:

  • To investigate the correlation between inactive CatD and retinal changes.
  • To characterize the impact of CatD mutations on retinal pigment epithelial (RPE) cells.
  • To establish a model for studying CatD-related retinal degeneration.

Main Methods:

  • Computational modeling to assess substrate binding of CatD mutants.
  • Cell transfection with CatD mutants (CatDM1, CatDM2) and measurement of protease activity.

Related Experiment Videos

  • Generation and analysis of transgenic mice (mcd/mcd, mcd2/mcd2) using PCR, Western blot, and protease assays.
  • Ophthalmoscopic, histological, and electron microscopy evaluation of retinal changes.

    • Main Results:

    • CatD mutants (CatDM1, CatDM2) showed limited or no protease activity.
    • Mice with inactive CatD (mcd2/mcd2) exhibited higher levels of inactive CatD.
    • Retinal abnormalities, including RPE cell changes and hypopigmentation, appeared earlier in mcd2/mcd2 mice.

    Conclusions:

    • A correlation exists between inactive CatD in RPE cells and retinal abnormalities.
    • Inactive CatD contributes to ophthalmoscopic, cellular, and histological retinal changes.
    • This study provides insights into the role of CatD in retinal disease pathogenesis.