Related Experiment Videos
Increased 5-hydroxytryptamine immunoreactivity in traumatized spinal cord. An experimental study in the rat
H S Sharma1, J Westman, Y Olsson
1Institute of Pathology, University Hospital, Uppsala, Sweden.
Acta Neuropathologica
|January 1, 1990
Summary
Spinal cord injury triggers a significant increase in serotonin (5-hydroxytryptamine, 5-HT) levels, particularly in nerve cell processes near the trauma site. Blocking 5-HT synthesis reduces this response, indicating its role in early spinal cord injury reactions.
Area of Science:
- Neuroscience
- Biochemistry
- Pathology
Background:
- Serotonin (5-hydroxytryptamine, 5-HT) is a neurotransmitter with known roles in various physiological processes.
- The involvement of 5-HT in acute spinal cord injury (SCI) responses remains incompletely understood.
Purpose of the Study:
- To investigate the role of serotonin (5-HT) in the immediate tissue reactions following spinal cord trauma in a rat model.
- To examine the changes in 5-HT distribution and levels after inducing a dorsal horn lesion.
Main Methods:
- Utilized an immunocytochemical technique to visualize 5-HT distribution in rat spinal cord tissue.
- Induced a specific dorsal horn lesion and assessed 5-HT changes in segments proximal and distal to the injury.
- Compared injured rats pretreated with p-chlorophenyl alanine (p-CPA), a 5-HT synthesis inhibitor, with untreated injured controls.
Main Results:
- Spinal cord trauma significantly increased 5-HT immunoreactivity, especially in the ipsilateral ventral horn, 2 mm proximal and distal to the lesion.
- A similar, though less pronounced, increase in 5-HT immunoreactivity was observed 5 mm distal to the lesion.
- Pretreatment with p-CPA markedly attenuated the trauma-induced elevation of 5-HT immunoreactivity, consistent with biochemical measurements.
Conclusions:
- Serotonin (5-HT) is present in nerve cell processes in the normal spinal cord and its levels increase significantly following trauma.
- These findings suggest that 5-HT plays a role in the early cellular responses to spinal cord injury.
- Inhibition of 5-HT synthesis can mitigate the acute increase in 5-HT observed after spinal cord trauma.