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Updated: Jun 26, 2026
Methods for Experimental Manipulations after Optic Nerve Transection in the Mammalian CNS
Published on: May 12, 2011
Tumor Necrosis Factor Receptor Superfamily Member 12A Enhances Retinal Ganglion Cell Survival and Promotes Axon
1Department of Ophthalmology, The Second Hospital of Jilin University, Changchun, China.
Abstract:
Regeneration of retinal ganglion cells (RGCs) in adult mammals is highly limited following injury. To uncover transcriptional pathways that enhance this process, we analyzed single-cell transcriptomic profiles of RGCs in mice after optic nerve crush (ONC) and identified potential targets for neuroprotection and axonal regeneration. scRNA-seq revealed that Tumor necrosis factor receptor superfamily member 12A (Tnfrsf12a, also known as Fn14) is enriched in biological processes linked to axonal regeneration in αRGCs/ipRGCs. To validate its neuroprotective and regenerative effects, we engineered an AAV2 viral vector to overexpress Fn14 and assessed its impact in two injury models: ONC and N-methyl-d-aspartate (NMDA)-induced retinal toxicity. Axonal regeneration was evaluated using anterograde cholera toxin subunit B (CTB) labeling, while RGC survival was assessed via RBPMS and β-III tubulin immunostaining, along with electroretinograms (ERG). In the ONC model, CTB tracing confirmed that Fn14 overexpression significantly promotes axonal regeneration, while RBPMS staining demonstrated robust RGC neuroprotection. In the NMDA model, Fn14 overexpression not only prevented NMDA-induced RGC degeneration but also preserved long-range axonal projections and retinal function. Transcriptomic analysis of Fn14-overexpressing retinas in the ONC model further revealed significant downregulation of suppressor of cytokine signaling 3 (Socs3), a finding validated in both injury models. Our study highlights Fn14 as a key regulator of optic nerve injury, capable of enhancing RGC survival and axon regeneration.
Insights
This study identifies Tumor necrosis factor receptor superfamily member 12A (Fn14) as a key factor for enhancing retinal ganglion cell (RGC) survival and axon regeneration after optic nerve injury.
Area of Science:
- Neuroscience
- Ophthalmology
- Regenerative Medicine
Background:
- Retinal ganglion cell (RGC) regeneration is limited in adult mammals after injury.
- Identifying molecular pathways to promote RGC survival and axonal regrowth is crucial for vision restoration.
Purpose of the Study:
- To investigate the role of Tumor necrosis factor receptor superfamily member 12A (Fn14) in RGC neuroprotection and axonal regeneration following optic nerve injury.
- To explore the therapeutic potential of Fn14 overexpression for treating retinal damage.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) of RGCs after optic nerve crush (ONC).
- AAV2-mediated overexpression of Fn14 in mouse models of ONC and N-methyl-d-aspartate (NMDA)-induced retinal toxicity.
- Assessment of axonal regeneration (CTB tracing) and RGC survival (immunostaining, ERG).
- Transcriptomic analysis to identify downstream targets.
Main Results:
- Fn14 is enriched in RGCs and associated with axonal regeneration pathways.
- Fn14 overexpression significantly promoted axonal regeneration and RGC survival in ONC and NMDA injury models.
- Fn14 preserved retinal function and long-range axonal projections.
- Fn14 overexpression led to downregulation of Suppressor of Cytokine Signaling 3 (Socs3).
Conclusions:
- Fn14 is a critical regulator of optic nerve injury response.
- Overexpression of Fn14 enhances RGC survival and promotes axonal regeneration.
- Fn14 represents a promising therapeutic target for optic nerve damage and vision recovery.
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