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Dopamine and NMDA systems modulate long-term nociception in the rat anterior cingulate cortex
Alberto López-Avila1, Ulises Coffeen, J Manuel Ortega-Legaspi
1Laboratorio de Neurofisiología Integrativa, Subdirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría Ramón de la Fuente, Camino a Xochimilco, 101 San Lorenzo Huipulco Tlalpan, México DF cp 14370, Mexico.
Pain
|August 26, 2004
Summary
Dopamine and NMDA receptor antagonists in the anterior cingulate cortex (ACC) reduce long-term pain in rats. This suggests an interaction between these systems in pain modulation.
Area of Science:
- Neuroscience
- Pain Research
- Pharmacology
Background:
- The anterior cingulate cortex (ACC) is crucial for pain processing.
- Glutamatergic pathways in the ACC intensify pain, while dopaminergic pathways inhibit it.
Purpose of the Study:
- To investigate the roles of dopaminergic and NMDA systems in the ACC.
- To modulate long-term nociception following sciatic denervation in rats.
Main Methods:
- Sciatic denervation model in rats to induce long-term nociception.
- Measurement of autotomy behavior to assess nociception score, onset, and incidence.
- Microinjection of dopamine, NMDA antagonist MK801, and amantadine into the ACC.
Main Results:
- Dopamine reduced autotomy behavior inversely dose-dependently, with 100 nM being most effective.
- MK801 and amantadine significantly decreased autotomy scores.
- D1 and D2 receptor antagonists blocked amantadine's antinociceptive effects.
Conclusions:
- Suggests an interaction between dopaminergic and glutamatergic systems in the ACC.
- Highlights the role of these systems in the development and persistence of long-term pain.