Glaucoma: from pathogenic mechanisms to retinal glial cell response to damage

Area of Science:

• Ophthalmology
• Neuroscience
• Immunology

Background:

• Glaucoma is a neurodegenerative retinal disease causing irreversible vision loss due to retinal ganglion cell (RGC) death.
• Elevated intraocular pressure (IOP) is a primary risk factor, but disease progression often continues despite IOP control.
• This suggests other factors beyond IOP contribute to RGC degeneration in glaucoma.

Purpose of the Study:

• To explore the role of neuroinflammation and glial cell activation in glaucoma pathogenesis.
• To identify potential new therapeutic strategies targeting these mechanisms.

Main Methods:

• Review of molecular pathways involved in RGC death.
• Analysis of the role of glial cells (microglia, astrocytes, Müller cells) in retinal immune response.
• Investigation of the link between IOP, glial activation, and blood-retinal barrier integrity.

Main Results:

• Glaucomatous neurodegeneration involves ischemia/hypoxia, mitochondrial dysfunction, oxidative stress, and neuroinflammation.
• Increased IOP activates retinal glial cells, potentially leading to a proinflammatory state.
• Chronic glial activation can disrupt the blood-retinal barrier and cause RGC death.

Conclusions:

• Glaucoma pathogenesis is complex, involving multiple factors beyond elevated IOP.
• Glial cell activation and the associated neuroinflammatory response are critical in driving RGC loss.
• Modulating the immune response and glial cell activity presents a promising avenue for novel glaucoma treatments.