Wireless Epidural Electrical Stimulation in Combination With Serotonin Agonists Improves Intraspinal Metabolism in...

Area of Science:

• Neuroscience
• Regenerative Medicine
• Biomedical Engineering

Background:

• Spinal cord injury (SCI) impairs lower-limb movement and intraspinal hemodynamics.
• Epidural electrical stimulation (EES) and serotonin agonists (5-HTA) show promise in restoring function.
• The impact of EES + 5-HTA on intraspinal metabolism post-SCI is not well understood.

Purpose of the Study:

• To investigate the effects of combined wireless EES (WEES) and 5-HTA on intraspinal metabolism in SCI rats.
• To determine if this combination therapy can restore basal metabolism and modulate task metabolism.

Main Methods:

• Rats with T8 spinal cord transection underwent 11 weeks of WEES + 5-HTA treatment and treadmill training.
• Locomotor function was assessed using motion capture.
• Positron emission tomography-computed tomography evaluated basal and task metabolism under different WEES conditions.

Main Results:

• WEES + 5-HTA significantly improved basal metabolism compared to individual treatments.
• Task metabolism was modulated in a frequency-dependent manner, with 60 Hz identified as a threshold for extensive spinal cord activation below the injury site.
• Locomotor function recovery was observed after the treatment period.

Conclusions:

• Combined WEES + 5-HTA can restore basal intraspinal metabolism to healthy levels post-SCI.
• Stimulation frequency is a key factor in modulating task metabolism, offering a potential therapeutic target for SCI recovery.