Experimental Autoimmunity and Neural Degeneration in Optic Pathways

The interplay between experimental autoimmunity and neural degeneration within optic pathways underpins the pathogenesis of optic neuritis and related demyelinating disorders. In preclinical models such as experimental autoimmune encephalomyelitis (EAE), immune responses against myelin components provoke optic nerve inflammation, leading to demyelination, axonal transection and retinal ganglion cell (RGC) death. Microglial and astrocytic activation can exert both protective and harmful effects, with aberrant complement activation and oxidative stress driving synaptic loss in the inner retina. Functional and structural assays—including optical coherence tomography (OCT) and visual evoked potentials (VEP)—capture early changes in synaptic integrity and conduction latency. Emerging biomarkers of inner plexiform layer thinning appear predictive of progression, while mechanistic insights into hypoxia-inducible pathways, mitochondrial dysfunction and complement cascades suggest targets for neuroprotective intervention and repair strategies to preserve visual function in demyelinating disease.

Research from Nature Portfolio

Recent studies have mapped the spatiotemporal dynamics of early demyelination and nascent axonal damage in the anterior visual pathway using the EAE model. Investigators observed that inflammatory demyelination and subtle axonal disruption precede clinical signs, manifesting as altered VEP amplitudes and prolonged latencies, followed by thinning of the retinal nerve fibre layer on OCT. Cell-specific transcriptomic analysis of optic nerve astrocytes revealed enrichment of complement cascade components, notably C3, which correlated with greater RGC loss in female subjects. These findings connect astrocytic complement activation to structural and functional deficits, thereby highlighting a cell-type-specific target for neuroprotective therapies in optic neuritis.

Experimental Autoimmunity and Neural Degeneration in Optic Pathways publication trend

The graph below shows the total number of articles in experimental autoimmunity and neural degeneration in optic pathways across all publications each year (not limited to Nature Index journals).

Technical terms

Experimental autoimmune encephalomyelitis (EAE): An animal model of central nervous system demyelination induced by immunisation with myelin antigens.

Optic neuritis (ON): Inflammatory demyelination of the optic nerve leading to visual impairment.

Retinal ganglion cell (RGC): Neuronal cell type in the retina whose axons form the optic nerve.

Demyelination: Loss or damage of myelin sheaths surrounding axons, impairing electrical conduction.

Optical coherence tomography (OCT): Imaging technique for non-invasive cross-sectional visualisation of retinal layers.

Complement cascade: A sequence of immune proteins that can mediate synapse elimination and inflammation.

Visual evoked potential (VEP): Electrophysiological measurement of cortical responses to visual stimuli, indicating conduction integrity.

References

1. Synaptic injury in the inner plexiform layer of the retina is associated with progression in multiple sclerosis. Cell Reports Medicine (2024).
2. Acriflavine, a HIF-1 inhibitor, preserves vision in an experimental autoimmune encephalomyelitis model of optic neuritis. Frontiers in Immunology (2023).
3. Demyelination and neurodegeneration early in experimental autoimmune encephalomyelitis contribute to functional deficits in the anterior visual pathway. Scientific Reports (2024).
4. The astrocyte transcriptome in EAE optic neuritis shows complement activation and reveals a sex difference in astrocytic C3 expression. Scientific Reports (2019).