Neurotransmitters in spinal cord injury

Area of Science:

• Neuroscience
• Neuroanatomy

Background:

• The distribution of neurotransmitters and enzymes in the spinal cord is crucial for understanding neural function and injury.
• Acetylcholinesterase and catecholamines play significant roles in spinal cord signaling.

Purpose of the Study:

• To investigate the distribution of acetylcholinesterase activity and catecholamine fluorescence in the rat spinal cord.
• To examine the effects of spinal cord transection on these neurochemical markers.
• To correlate observed changes with the development of spasticity.

Main Methods:

• Histochemical staining for acetylcholinesterase activity.
• Fluorescence microscopy to visualize catecholamine terminals.
• Comparison of intact versus completely transected rat spinal cords.

Main Results:

• Catecholamine terminals were concentrated in the anterior and intermediate horns, with intense fluorescence in the thoracic intermediolateral cell column.
• Spinal transection led to increased catecholamine fluorescence proximal to the lesion and its absence distal to it within seven days.
• Acetylcholinesterase distribution showed no significant changes after spinal transection.

Conclusions:

• Spinal cord injury profoundly impacts catecholamine systems, suggesting their involvement in post-lesion neurological changes.
• The stability of acetylcholinesterase distribution indicates differential responses of neurochemical systems to spinal trauma.
• These neurochemical alterations are linked to the emergence of spasticity following spinal cord injury.