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Differential c-fos-like protein expression in mechanically versus chemically induced visceral nociception
J A DeLeo1, D W Coombs, L E McCarthy
1Department of Anesthesiology, Dartmouth-Hitchcock Medical Center, Hanover, NH 03756.
Brain Research. Molecular Brain Research
|September 1, 1991
Summary
Different visceral pain types activate distinct spinal cord patterns. Chemical pain targets specific spinal areas, while mechanical pain triggers broader neuronal responses, indicating differential pain processing.
Area of Science:
- Neuroscience
- Pain Research
- Immunohistochemistry
Background:
- C-fos-like protein expression is a marker for neuronal activity in pain processing.
- Understanding distinct patterns of neuronal activation is crucial for pain research.
Purpose of the Study:
- To investigate if different visceral noxious stimuli induce distinct patterns of c-fos-like protein expression in the rat spinal cord.
- To differentiate spinal cord activation patterns between chemical and mechanical visceral pain.
Main Methods:
- Development of a mechanical visceral pain model using duodenal distention.
- Immunocytochemical detection of c-fos-like protein in the spinal cord after noxious stimuli.
- Comparison of c-fos-like immunoreactivity patterns following acetic acid injection versus duodenal distention.
Main Results:
- Distinct patterns of c-fos-like immunoreactivity were observed for chemical and mechanical noxious stimuli.
- Chemical stimulus induced c-fos bilaterally in laminae I and X (thoraco-lumbar region).
- Mechanical stimulus induced greater and more intense c-fos expression in laminae I-VI, IX, and X.
Conclusions:
- Visceral noxious stimuli evoke differential patterns of spinal cord neuronal activation.
- These findings suggest distinct nociceptive modulation pathways for mechanical versus chemical visceral pain.