Involvement of tdTomato-Tagged RPE cells in a mouse PVR model with enzymatically compromised retina

Area of Science:

• Ophthalmology
• Cell Biology
• Retinal Disease Research

Background:

• Proliferative vitreoretinopathy (PVR) is a leading cause of vision loss following ocular trauma or surgery.
• Retinal pigment epithelium (RPE) cell dispersion is a key risk factor, but current animal models do not accurately replicate PVR pathology.
• Understanding the cellular and molecular mechanisms of PVR is crucial for developing effective treatments.

Purpose of the Study:

• To establish a reliable in situ mouse model of PVR that mimics human pathology.
• To validate the role of RPE cells in PVR development.
• To investigate the molecular changes associated with PVR.

Main Methods:

• A novel PVR mouse model was created using dispase treatment to induce retinal damage.
• Immunostaining of human epiretinal membranes and quantitative PCR were used to analyze RPE cell involvement and phenotype changes.
• Gene expression profiles of the mouse model were compared to human PVR samples.

Main Results:

• The dispase-induced mouse model successfully formed epiretinal membrane (ERM)-like tissues.
• Immunostaining confirmed RPE cell participation in human PVR.
• Quantitative PCR revealed RPE cell dedifferentiation from epithelial to mesenchymal phenotypes, promoting proliferation and migration.
• Mouse PVR model gene expression closely matched human PVR profiles.

Conclusions:

• The developed RPE-tagged mouse model accurately recapitulates human PVR pathology.
• RPE cell dedifferentiation is a critical mechanism driving PVR.
• This validated mouse model is suitable for future molecular mechanism and pharmaceutical studies of PVR.