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Updated: Jul 6, 2026
Laser-Induced Chronic Ocular Hypertension Model on SD Rats
Published on: December 4, 2007
Blocking LINGO-1 function promotes retinal ganglion cell survival following ocular hypertension and optic nerve
Qing-Ling Fu1, Bing Hu, Wutian Wu
1Department of Anatomy, Li Ka Shing Faculty of Medicine, University of Hong Kong, Hong Kong SAR, China.
Purpose:
LINGO-1 is a functional member of the Nogo66 receptor (NgR1)/p75 and NgR1/TROY signaling complexes that prevent axonal regeneration through RhoA in the central nervous system. LINGO-1 also promotes cell death after neuronal injury and spinal cord injury. The authors sought to examine whether blocking LINGO-1 function with LINGO-1 antagonists promotes retinal ganglion cell (RGC) survival after ocular hypertension and optic nerve transection.
Methods:
An experimental ocular hypertension model was induced in adult rats using an argon laser to photocoagulate the episcleral and limbal veins. LINGO-1 expression in the retinas was investigated using immunohistochemistry and Western blotting. Soluble LINGO-1 protein (LINGO-1-Fc) and anti-LINGO-1 mAb 1A7 were injected into the vitreous body to examine their effects on RGC survival after ocular hypertension and optic nerve transection. Signal transduction pathways mediating neuroprotective LINGO-1-Fc effects were characterized using Western blotting and specific kinase inhibitors.
Results:
LINGO-1 was expressed in RGCs and up-regulated after intraocular pressure elevation. Blocking LINGO-1 function with LINGO-1 antagonists, LINGO-1-Fc and 1A7 significantly reduced RGC loss 2 and 4 weeks after ocular hypertension and also promoted RGC survival after optic nerve transection. LINGO-1-Fc treatment blocked the RhoA, JNK pathway and promoted Akt activation. LINGO-1-Fc induced Akt phosphorylation, and the survival effect of LINGO-1 antagonists was abolished by Akt phosphorylation inhibitor.
Conclusions:
The authors demonstrated that blocking LINGO-1 function with LINGO-1 antagonists rescues RGCs from cell death after ocular hypertension and optic nerve transection. They also delineated the RhoA and PI-3K/Akt pathways as the predominant mediator of LINGO-1-Fc neuroprotection in this paradigm of RGC death.
Insights
Blocking LINGO-1 function with antagonists rescues retinal ganglion cells (RGCs) from death after ocular hypertension and optic nerve injury. This neuroprotection involves the RhoA and PI-3K/Akt pathways, promoting RGC survival.
Area of Science:
- Neuroscience
- Ophthalmology
- Cell Biology
Background:
- LINGO-1 is implicated in preventing axonal regeneration and promoting cell death in the central nervous system.
- LINGO-1 is part of signaling complexes that inhibit axonal regrowth.
- Elevated LINGO-1 expression is linked to neuronal injury.
Purpose of the Study:
- To investigate if blocking LINGO-1 function with antagonists can preserve retinal ganglion cell (RGC) survival.
- To assess the efficacy of LINGO-1 antagonists in models of ocular hypertension and optic nerve transection.
Main Methods:
- Induced experimental ocular hypertension in rats.
- Examined LINGO-1 expression in retinas via immunohistochemistry and Western blotting.
- Administered LINGO-1-Fc protein and anti-LINGO-1 mAb 1A7 intravitreally.
- Analyzed signal transduction pathways using Western blotting and kinase inhibitors.
Main Results:
- LINGO-1 was expressed in RGCs and upregulated following elevated intraocular pressure.
- LINGO-1 antagonists (LINGO-1-Fc, 1A7) significantly reduced RGC loss post-ocular hypertension and promoted survival after optic nerve transection.
- LINGO-1-Fc inhibited RhoA and JNK pathways while activating Akt phosphorylation.
Conclusions:
- Blocking LINGO-1 function with antagonists effectively rescues RGCs from cell death in models of ocular hypertension and optic nerve injury.
- The neuroprotective effects of LINGO-1 antagonists are mediated by the RhoA and PI-3K/Akt signaling pathways.
