Enhanced glaucomatous damage accompanied by glial response in a new multifactorial mouse model

Area of Science:

• Ophthalmology
• Neuroscience
• Immunology

Background:

• Glaucoma is a complex, multifactorial neurodegenerative disease leading to blindness.
• Elevated intraocular pressure (IOP) and immune processes are implicated in glaucomatous damage.

Purpose of the Study:

• To investigate if combining IOP elevation and immune response models exacerbates damage to retinal ganglion cells (RGCs) and optic nerves.
• To examine the impact on glia activation in a novel glaucoma model.

Main Methods:

• A combined glaucoma model using wildtype (WT) and βB1-Connective Tissue Growth Factor (CTGF) mice immunized with optic nerve antigen (ONA).
• Monitoring IOP, performing electroretinogram (ERG), and analyzing retinae and optic nerves via histology and RT-qPCR.

Main Results:

• Combined IOP elevation and immune response (CTGF+ONA) led to the most severe optic nerve inflammation, demyelination, and macroglia activation.
• Pronounced loss of RGCs and enhanced microglia/macrophage activation were observed in CTGF+ONA retinae.
• Apoptotic cells increased in all glaucoma groups, and Müller cell activation occurred in CTGF and CTGF+ONA retinae.

Conclusions:

• A novel glaucoma model demonstrated an additive degeneration in optic nerves and RGCs.
• High IOP and immune factors appear to play an additive role in glaucoma development, aiding precise understanding of this multifactorial disease.