Transplanted OECs Protect Visual Function by Regulating the Glutamate Metabolic Microenvironment in the Glaucoma...

Area of Science:

• Neuroscience
• Ophthalmology
• Cell Biology

Background:

• Glaucoma causes irreversible blindness through retinal ganglion cell (RGC) loss.
• Elevated glutamate in glaucoma leads to excitotoxicity, damaging RGCs.
• Olfactory ensheathing cells (OECs) transplantation previously preserved visual function, but mechanisms were unclear.

Purpose of the Study:

• To investigate the therapeutic mechanisms of OECs in a rat glaucoma model.
• To determine if OECs can modulate the glutamate microenvironment and protect RGCs.

Main Methods:

• A rat glaucoma model was induced using magnetic microspheres.
• Visual function was assessed via optokinetic response and pattern electroretinogram.
• Gene expression, immunofluorescence, and co-culture experiments elucidated OEC mechanisms.

Main Results:

• Glaucoma models showed increased glutamate and damage to astrocytes (AC) and RGCs.
• OECs transplantation reduced optic nerve glutamate, protected AC and RGCs from apoptosis, and preserved visual function.
• OECs demonstrated superior glutamate metabolism compared to AC and Müller glia, improving the optic nerve microenvironment.

Conclusions:

• OECs transplantation offers neuroprotection in glaucoma by regulating the glutamate microenvironment.
• OECs protect against glutamate excitotoxicity, supporting RGC survival and function.