Restoring Function After Severe Spinal Cord Injury Through BioLuminescent-OptoGenetics.

Area of Science:

• Neuroscience
• Regenerative Medicine
• Biotechnology

Background:

• Spinal cord injury (SCI) impairs neuronal connections, necessitating rehabilitation strategies.
• Targeted neuronal stimulation can aid recovery by preserving or forming neural connections.
• Current methods often lack specificity or are invasive.

Purpose of the Study:

• To investigate the efficacy of bioluminescent optogenetics (BL-OG) for non-invasive neuronal stimulation post-SCI.
• To assess the impact of BL-OG on locomotor recovery and neuronal plasticity in a rat SCI model.
• To establish BL-OG as a potential therapeutic approach for SCI rehabilitation.

Main Methods:

• Rats received lumbar spinal cord transduction with AAV2/9 to express excitatory luminopsin 3 (LMO3).
• Contusion SCI was induced in the thoracic spine.
• Rats were treated with coelenterazine (CTZ) or vehicle to activate LMO3-expressing neurons below the injury level.
• Locomotor function, histology, and gene expression were analyzed.

Main Results:

• Activation of spinal neurons via BL-OG significantly improved locomotor recovery in rats following SCI.
• Functional recovery persisted beyond the 2-week treatment period.
• Histological and gene expression analyses indicated neuronal plasticity as a key mechanism.

Conclusions:

• Bioluminescent optogenetic activation of spinal neurons promotes accelerated and enhanced locomotor recovery after SCI.
• BL-OG offers a non-invasive, specific method for stimulating neuronal populations to aid SCI rehabilitation.
• This approach provides a foundation for novel therapeutic strategies to restore function after spinal cord injury.